Agricultural product drying device and method based on cyclone strengthening and distribution regulation

Abstract

The application relates to the technical field of agricultural product drying equipment, in particular to an agricultural product drying device based on cyclone strengthening and distribution regulation, which comprises a hot air generating device, an airflow guide structure and a drying bin. A double-Fermi spiral flow channel is arranged in the hot air generating device, cold and hot fluids flow reversely in the respective flow channels, efficient heat exchange is realized to generate high-quality dry hot air, the high-quality dry hot air sequentially passes through a diffusion cover and guide vanes arranged in the diffusion cover after passing through a dry hot air conveying pipeline, enters the drying bin, and makes the airflow change from concentrated axial flow into uniform rotary flow. Under the action of centrifugal force and a tapered channel, the airflow is distributed in the circumferential direction of the drying bin and passes through crops on a drying table to realize drying. The application can effectively solve the problems of uneven airflow distribution and uneven drying in traditional drying equipment, has the advantages of high drying efficiency, good uniformity and compact structure, can improve the drying quality and efficiency of agricultural products, and has a good application prospect.

Description

Technical Field

[0001] This invention belongs to the field of agricultural product drying technology, specifically an agricultural product drying device and method based on cyclone enhancement and distribution control. Background Technology

[0002] In the entire agricultural product processing process, heating, dehydration, and drying are the core key processes for ensuring the sensory quality, retention of nutrients, and effective extension of shelf life. The stable operation of this process highly depends on high-quality, dry, hot air with constant temperature, uniform flow rate, and regular distribution. Only when these conditions are met can uniform heating and efficient dehydration of agricultural materials be achieved simultaneously, avoiding problems such as over-drying and under-drying that affect product quality. Currently, agricultural product drying systems generally use conventional heat exchangers to heat air before delivering it to the drying chamber. However, existing hot air drying methods have many technical shortcomings: on the one hand... Hot air is mostly supplied by conventional heat exchangers, whose internal flow channel structure is relatively simple and fluid disturbance is insufficient, resulting in limited heat exchange efficiency and difficulty in continuously providing high-quality dry hot air. On the other hand, the airflow organization in the drying chamber is unreasonable. The airflow often enters the drying area directly in an axial form, which easily forms local high-speed channels or stagnant areas, causing some materials to be over-dried while other areas are under-dried, resulting in poor overall uniformity. Therefore, how to give full play to the mass transfer enhancement effect of airflow in the drying process and achieve a stable supply and reasonable distribution of uniform hot air for drying has become a technical problem that urgently needs to be solved in the field of drying equipment.

[0003] To improve the drying effect, it is necessary to propose a drying device that integrates efficient heat exchange and airflow organization and control. By optimizing the heat exchange channel structure and the distribution method of airflow before entering the drying chamber, the hot air can form a uniform flow state with certain rotational characteristics before entering the drying area, thereby enhancing the airflow's penetration ability into the material layer, improving drying uniformity and efficiency, and meeting the demand for high-quality hot air in the drying process of agricultural products. Summary of the Invention

[0004] The purpose of this invention is to provide an agricultural product drying device and method based on cyclone enhancement and distribution control, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an agricultural product drying device based on swirling flow enhancement and distribution control, comprising a hot air generating device, wherein a hot fluid outlet and a dry air inlet are respectively provided at the middle of the bottom and top of the hot air generating device, and a hot fluid inlet and a dry air outlet are provided on the outer side of the hot air generating device, wherein a biomimetic turbulence structure is provided at the dry air inlet, and a double Fermat spiral flow channel arranged symmetrically or asymmetrically is provided inside the hot air generating device, wherein a conveying pipe is fixedly connected to the outer side of the dry air outlet, and a diffuser is fixedly connected to the top of the conveying pipe, wherein guide vanes are provided inside the diffuser, and a drying chamber is fixedly connected to the top of the diffuser, wherein a dry hot air converging flow channel, an air inlet, a drying platform, and a baffle are provided inside the drying chamber, wherein a dehumidification port is provided on the top of the drying chamber, and a handle is fixedly connected to the top of the drying platform.

[0006] Preferably, the biomimetic turbulence structure includes octopus-like tentacles, octopus-like suckers, and through holes, wherein the octopus-like tentacles taper along their length from the dry air inlet.

[0007] Preferably, the through hole is formed on the surface of the imitation octopus tentacle, the outer surface of the imitation octopus tentacle is fixedly connected to one end of the imitation octopus suction cup, and the imitation octopus suction cup and the through hole are evenly distributed on the surface of the imitation octopus tentacle.

[0008] Preferably, the double Fermat spiral channel includes a first Fermat spiral and a second Fermat spiral, and the spacing between the double Fermat spiral channels varies non-uniformly in the radial direction, gradually decreasing from the inside to the outside.

[0009] Preferably, the parametric equation of the first Fermat spiral is: x t =A1*sqrt(t)*cos(t) y t =A2*sqrt(t)*sin(t) Where t∈(0,A3) The parametric equation of the second Fermat spiral is: x t =-A1*sqrt(t)*cos(t) y t =-A2*sqrt(t)*sin(t) In the formula, t∈(0,A3), A1 and A2 are the scale control parameters of Fermat's spiral in the x and y directions, which are used to adjust the expansion speed and overall size of the spiral; A3 is the upper limit of parameter t, which is used to control the number of spiral turns and the total length. The preferred value of A3 is 4π-8π, that is, two to four turns.

[0010] Preferably, the values ​​of A1 and A2 are set according to the size of the hot air generating device: When A1=A2, the first and second Fermat spirals are in a standard symmetrical form. When A1≠A2, the first and second Fermat spirals are in a stretched form, used for asymmetric structural spaces.

[0011] Preferably, the diffuser is a gradually expanding structure with its cross-sectional area gradually increasing along the airflow direction; the guide vanes are inclinedly arranged inside the diffuser near the outlet, and the guide vanes are inclined flat plate structures or curved structures; an air inlet is opened on the dry hot air converging channel; a baffle is arranged on the drying platform near the dry hot air converging channel; the drying platform is an open, mesh, or sieve structure; the exhaust port is located at the top edge of the drying chamber; the area of ​​the drying platform gradually increases from bottom to top inside the drying chamber; the diffusion angle of the diffuser is 30°-45°; and the inclination angle of the guide vanes is 30°-60°.

[0012] A method for drying agricultural products based on swirl enhancement and distribution control includes the following steps: Step 1: Cold fluid dry air enters through the dry air inlet in the middle of the hot air generating device. It is diverted by the biomimetic octopus tentacles, and microscale vortices are formed by the biomimetic octopus suction cups and through holes, which disrupt the initial boundary layer of the airflow. Step 2: The disturbed dry air enters the double Fermat spiral channel and flows outward from the center; the hot fluid enters from the hot fluid inlet on the outside of the hot air generating device and flows from the outside to the center along the double Fermat spiral channel, forming a counter-current heat exchange with the dry air. Step 3: Dry air undergoes sufficient heat exchange to form dry hot air, which is discharged from the dry air outlet and transported to the interior of the diffuser via a delivery pipeline. At the same time, the heat-exchanged hot fluid is discharged from the hot fluid outlet. Step 4: The dry hot air slows down and flows evenly inside the diffuser. After passing through the guide vanes to form a rotating airflow, it enters the drying chamber. The rotating airflow passes through the dry hot air gradually narrowing channel and the air inlet, and then passes through the agricultural product layer on the drying table. The humid air is discharged from the exhaust port. Step 5: After the agricultural products are dried, remove the drying table from the drying chamber using the handle and replace it with the agricultural products to be dried.

[0013] Preferably, the design of the octopus-like suction cup and through holes on the biomimetic turbulence structure in step one allows the cleaning medium to flow into the channel more evenly, thus facilitating the cleaning of the channel. The double Fermat spiral channel in step two has anti-clogging and online cleaning functions.

[0014] Preferably, the dry air continuously changes its velocity and direction within the double Fermat spiral channel, and the residence time is extended by the radial non-uniform spacing of the channel, thereby enhancing the fluid shearing and mixing effect.

[0015] The beneficial effects of this invention are as follows: 1. This invention, by setting up a double Fermat spiral channel, a first Fermat spiral, and a second Fermat spiral, and rationally arranging the first and second Fermat spirals to maintain a symmetrical or asymmetrical distribution, and by exhibiting a non-uniform decreasing geometric feature in the radial direction from the inside to the outside of the channel spacing, can effectively prolong the residence time of the fluid in the heat exchange area, continuously change the fluid velocity and flow direction, significantly enhance the shearing effect and internal mixing effect between fluids, and greatly disrupt the flow boundary layer, so that heat transfer is more complete and uniform. From a structural level, it achieves a significant improvement in heat exchange efficiency and better meets the high-efficiency heat exchange requirements for agricultural product drying.

[0016] 2. This invention constructs a biomimetic turbulence structure by combining octopus-like tentacles, octopus-like suckers, and through holes. The tapering shape of the octopus-like tentacles enables multi-stage diversion and directional guidance of the incoming airflow. Combined with the octopus-like suckers and through holes, it forms local microscale vortices and strong disturbance effects, effectively disrupting the initial boundary layer of the airflow and significantly increasing the degree of fluid turbulence. This allows the airflow to enter the subsequent heat exchange channel in a more uniform, stable, and more turbulent state, laying a good flow foundation for efficient heat exchange.

[0017] 3. By setting up a diffuser cavity and guide vanes, the present invention transforms the airflow from a concentrated axial flow to a uniform rotating flow. In the axial direction, the design of the dry hot air gradually narrows the flow channel, which helps to maintain the ability of some dry hot air to enter the crops on the drying table along the axial direction of the drying chamber. In the circumferential direction, the centrifugal effect of the swirling flow causes the dry hot air to be distributed circumferentially in the drying chamber, thereby improving the airflow's penetration ability into the crops.

[0018] In summary, this invention significantly improves the problem of uneven airflow distribution in the drying chamber by optimizing the airflow organization, thereby enhancing the uniformity and efficiency of crop drying. It has advantages such as reasonable structure, good drying effect, and strong applicability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall drying system of the present invention; Figure 2 This is a cross-sectional schematic diagram of the hot air generating device of the present invention; Figure 3 This is a longitudinal cross-sectional schematic diagram of the hot air generating device of the present invention; Figure 4 This is a three-dimensional schematic diagram of the octopus-like tentacles of the present invention; Figure 5 This is a schematic diagram of the double Fermat helix structure of the present invention; Figure 6 This is a schematic diagram of the drying chamber structure of the present invention; Figure 7This is a cross-sectional structural diagram of the drying chamber of the present invention; Figure 8 This is a simulation cloud map of the internal temperature of the drying chamber in this invention; Figure 9 This is a simulation cloud diagram of the internal flow lines of the drying chamber of this invention.

[0020] In the diagram: 1. Dry air inlet; 2. Dry air outlet; 3. Hot fluid inlet; 4. Hot fluid outlet; 5. First Fermat spiral; 6. Second Fermat spiral; 7. Hot air generator; 8. Octopus-like tentacles; 9. Octopus-like suckers; 10. Through hole; 11. Conveying pipe; 12. Diffuser; 13. Guide vanes; 14. Drying chamber; 15. Handle; 141. Dry hot air converging channel; 142. Air inlet; 143. Drying platform; 144. Baffle; 145. Exhaust port. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1 to 9 As shown, this embodiment of the invention provides an agricultural product drying device based on swirling flow enhancement and distribution control, including a hot air generating device 7. The bottom and top of the hot air generating device 7 are respectively provided with a hot fluid outlet 4 and a dry air inlet 1. The outer side of the hot air generating device 7 is provided with a hot fluid inlet 3 and a dry air outlet 2. A biomimetic turbulence structure is provided at the dry air inlet 1. The interior of the hot air generating device 7 is provided with mutually isolated and symmetrically or asymmetrically arranged double Fermat spiral channels. A conveying pipe 11 is fixedly connected to the outer side of the dry air outlet 2. A diffuser hood 12 is fixedly connected to the top of the conveying pipe 11. A guide vane 13 is provided inside the diffuser hood 12. A drying chamber 14 is fixedly connected to the top of the diffuser hood 12. The drying chamber 14 is provided with a dry hot air converging channel 141, an air inlet 142, a drying platform 143, and a baffle 144. A dehumidification outlet 145 is opened at the top of the drying chamber 14. A handle 15 is fixedly connected to the top of the drying platform 143.

[0023] The cold fluid is dry air used for drying agricultural products, and the hot fluid is the heating medium. The source of the hot fluid is not limited and can be high-temperature gas generated by industrial waste heat recovery systems, hot air generated by fuel combustion, or other forms of heat source fluid. The cold and hot fluids form counter-current heat exchange through the heat exchange walls in their respective flow channels. The layout of central air intake, external outflow and counter-current heat exchange, combined with biomimetic turbulence and double Fermat spiral flow channels, allows the cold and hot fluids to fully contact each other, greatly improving the uniformity and efficiency of heat exchange, improving the problem of uneven airflow distribution, and stably outputting high-quality dry hot air. This meets the stringent requirements of agricultural product drying for uniform hot air temperature and flow rate, reducing energy consumption and improving drying quality.

[0024] Among them, the biomimetic turbulence structure includes octopus-like tentacles 8, octopus-like suckers 9, and through holes 10. The octopus-like tentacles 8 have a tapering structure along the length direction from the dry air inlet 1.

[0025] This design can compensate for the flow rate attenuation along the flow path through the tapered structure, allowing the fluid to maintain a relatively stable flow state during the porous flow splitting process, thereby achieving a uniform distribution of pressure along the flow path.

[0026] Among them, through holes 10 are formed on the surface of the imitation octopus tentacles 8, the outer surface of the imitation octopus tentacles 8 is fixedly connected to one end of the imitation octopus suction cups 9, and the imitation octopus suction cups 9 and through holes 10 are evenly distributed on the surface of the imitation octopus tentacles 8.

[0027] This design can create local disturbances and microscale vortex structures, enhance fluid mixing and disrupt the initial boundary layer, thereby increasing the degree of fluid turbulence.

[0028] The double Fermat spiral channel includes a first Fermat spiral 5 and a second Fermat spiral 6. The spacing between the double Fermat spiral channels varies non-uniformly along the radial direction and gradually decreases from the inside to the outside.

[0029] This design allows the fluid to continuously change its velocity and direction during flow, thereby enhancing the fluid shearing and mixing effects and effectively extending the fluid residence time.

[0030] The parametric equation of the first Fermat spiral is: x t =A1*sqrt(t)*cos(t) y t =A2*sqrt(t)*sin(t) Where t∈0, A3 The parametric equation for the second Fermat spiral is: x t =-A1*sqrt(t)*cos(t) y t =-A2*sqrt(t)*sin(t) In the formula, t∈0, A3, A1, and A2 are the scale control parameters of Fermat's spiral in the x and y directions, used to adjust the expansion speed and overall size of the spiral; A3 is the upper limit of parameter t, used to control the number of spiral turns and the total length. The preferred value of A3 is 4π-8π, that is, two to four turns.

[0031] By controlling the double helix shape with precise parametric equations, the flow path, velocity distribution and heat exchange area can be flexibly adjusted, so that the fluid continuously generates disturbance in the flow channel, prolonging the effective heat exchange time, enhancing boundary layer destruction and heat transfer, and at the same time facilitating precise matching of structural dimensions according to operating conditions, improving the device's versatility and heat exchange stability.

[0032] The values ​​of A1 and A2 are set according to the size of the hot air generating device 7: When A1=A2, the first Fermat spiral 5 and the second Fermat spiral 6 are in a standard symmetric form; When A1≠A2, the first Fermat spiral 5 and the second Fermat spiral 6 are in a stretched form, used for asymmetric structural space.

[0033] A1 and A2 can be flexibly adjusted to achieve standard central symmetry, ensuring uniform flow field and heat exchange balance, while also forming a stretched shape to adapt to asymmetrical installation space. This balances structural regularity and scene adaptability, simplifies processing and assembly, and enhances the device's compatibility with different drying conditions and installation requirements.

[0034] The diffuser 12 has a gradually expanding structure, with its cross-sectional area gradually increasing along the airflow direction. The guide vanes 13 are inclinedly arranged inside the diffuser 12 near the outlet. The guide vanes 13 have an inclined flat plate structure or a curved structure. An air inlet 142 is opened on the dry hot air converging channel 141. A baffle 144 is arranged on the drying platform 143 near the dry hot air converging channel 141. The drying platform 143 has an open, mesh, or sieve structure. The exhaust port 145 is located at the top edge of the drying chamber 14. The area of ​​the drying platform 143 gradually increases from bottom to top inside the drying chamber 14. The diffusion angle of the diffuser 12 is 30°-45°, and the inclination angle of the guide vanes 13 is 30°-60°.

[0035] The gradually expanding diffuser hood 12 can reduce airflow speed and improve airflow distribution uniformity; the inclined guide vanes 13 can guide the airflow to form a rotating flow, enhancing the material penetration effect; the dry hot air gradually narrowing channel 141, together with the air inlet 142, allows the airflow to enter the material layer stably and evenly; the baffle 144 can prevent airflow deviation and prevent crops from falling; the perforated / mesh drying table 143 provides smooth ventilation for crop drying; the top edge exhaust port 145 quickly discharges humid air, greatly improving drying uniformity and efficiency, and avoiding uneven drying of materials.

[0036] A method for drying agricultural products based on swirl enhancement and distribution control includes the following steps: Step 1: Cold fluid dry air enters through the dry air inlet 1 in the middle of the hot air generating device 7, and is diverted by the biomimetic octopus tentacles 8, the octopus suction cups 9 and the through holes 10 to form microscale vortices, which destroy the initial boundary layer of the airflow. Step 2: The disturbed dry air enters the double Fermat spiral channel and flows outward from the center; the hot fluid enters from the hot fluid inlet 3 outside the hot air generating device 7 and flows from the outside to the center along the double Fermat spiral channel, forming a counter-current heat exchange with the dry air. Step 3: Dry air undergoes sufficient heat exchange to form dry hot air, which is discharged from dry air outlet 2 and transported to the interior of diffuser 12 via conveying pipe 11. At the same time, the heat-exchanged hot fluid is discharged from hot fluid outlet 4. Step 4: The dry hot air is slowed down and evenly distributed in the diffuser 12. After forming a rotating airflow through the guide vanes 13, it enters the drying chamber 14. The rotating airflow passes through the dry hot air converging channel 141 and the air inlet 142 and passes through the agricultural product layer on the drying table 143. The humid air is discharged from the exhaust port 145. Step 5: After the agricultural products are dried, remove the drying table 143 from the drying chamber 14 using handle 15 and replace it with the agricultural products to be dried.

[0037] This method integrates efficient heat exchange and uniform drying into a single design, with a seamless process adapted to the drying needs of agricultural products. A biomimetic turbulence structure first diverts and disturbs the airflow, disrupting the boundary layer. Combined with a double Fermat spiral counter-current heat exchange, this significantly improves heat exchange efficiency and stably produces high-quality dry, hot air. A gradually expanding diffuser 12 slows and equalizes the flow, while guide vanes 13 create a swirling flow. Combined with a gradually narrowing dry air channel 141 and an air inlet 142, this ensures the airflow penetrates the agricultural product layer evenly, preventing uneven drying. A top exhaust port 145 quickly discharges humid air, preventing moisture re-entry. A removable drying table 143 with a handle 15 facilitates easy loading and unloading of materials, simplifying operation. Overall, the optimized airflow organization and heat exchange process balance efficient heat exchange, uniform drying, and ease of operation, significantly improving drying efficiency and agricultural product quality.

[0038] In step one, the design of the octopus-like suction cup 9 and the through hole 10 on the biomimetic turbulence structure allows the cleaning medium to flow into the channel more evenly, thus facilitating the cleaning of the channel. In step two, the double Fermat spiral channel has anti-clogging and online cleaning functions.

[0039] The through-hole allows cleaning media to be introduced for online cleaning. Combined with the double Fermat spiral flow channel with no dead angles and low resistance, it effectively prevents dust and impurities from clogging the system, reduces downtime maintenance, maintains smooth flow and heat exchange performance, extends the service life of the device, and improves long-term operational reliability.

[0040] In this process, the dry air continuously changes its velocity and direction within the double Fermat spiral channel, and the residence time is extended by the radial non-uniform spacing of the channel, thereby enhancing the fluid shearing and mixing effect.

[0041] The non-uniform spiral flow channel causes the fluid to continuously change speed and direction, significantly prolonging the residence time, enhancing the shear and mixing effects, continuously disrupting the thermal boundary layer, improving the heat transfer coefficient, allowing for more complete heat exchange, achieving higher heat exchange efficiency in the same volume, and optimizing the quality of hot air for drying.

[0042] Working principle and usage process: Dry air enters the interior of the hot air generating device 7 through the dry air inlet 1 in the middle. It first flows through the biomimetic turbulence structure and achieves uniform flow distribution under the gradual guiding effect of the octopus tentacles 8. Together with the octopus suction cups 9 and the through holes 10, it induces a large number of micro-scale vortices, effectively destroying the initial flow boundary layer of the airflow and significantly improving the degree of airflow turbulence. This creates good flow conditions for efficient heat exchange. After being fully disturbed and evenly distributed, the dry air then enters the double Fermat spiral flow channel and flows from the center to the outside along the channel. At the same time, the heating medium enters from the hot fluid inlet 3 on the outside of the hot air generating device 7 and flows from the outside to the center in the opposite direction, forming a stable and efficient counter-current heat exchange with the dry air.

[0043] Because the spacing of the spiral channels decreases non-uniformly along the radial direction, the dry air continuously changes its velocity and direction during the flow process, effectively extending the residence time in the device and greatly enhancing the shearing, mixing and heat transfer effects between fluids. After sufficient heat exchange is completed, the dry hot air that meets the requirements of the drying process is stably discharged from the dry air outlet 2 and directly used for heating, dehydration and drying of agricultural products. The hot fluid that has completed heat exchange is discharged from the hot fluid outlet 4, completing the entire heat exchange cycle.

[0044] Hot, dry air is delivered through the conveying pipe 11 into the diffuser 12 with a gradually expanding structure. The airflow is slowed down and evenly distributed. Then, it is guided by the inclined guide vanes 13 to form a rotating airflow, which enters the drying chamber 14. Under the guidance of the hot, dry air gradually narrowing channel 141, the swirling airflow flows out evenly through the air inlet 142. The baffle 144 prevents the airflow from deviating and prevents the crops from falling. The airflow stably passes through the agricultural product layer on the perforated / mesh / sieve-type drying table 143, fully removing the moisture from the material. The humid air is quickly discharged from the exhaust port 145 near the edge of the top of the drying chamber 14 to avoid moisture return. After the agricultural products are dried, they can be easily removed from the drying chamber 14 through the handle 15 on the drying table 143 to replace the agricultural products to be dried, and the drying operation is repeated.

[0045] To illustrate the beneficial effects of this invention on agricultural product drying, the hot air flow within the drying chamber was simulated and analyzed using Fluent numerical simulation software. The temperature distribution cloud map and velocity streamline diagram can be obtained from... Figure 8and Figure 9 As can be seen, hot air enters the drying chamber 14 under the action of the diffuser 12 and the guide vanes 13. Combined with the design of the dry hot air converging channel 141, the hot air has circumferential and axial flow capabilities, achieving a relatively uniform temperature distribution throughout the drying platform 143. The hot air enters from the bottom of the drying chamber 14 and passes through the drying platform 143 from bottom to top. Since the amount of agricultural products that the drying platform 143 can hold increases from bottom to top, and the exhaust port 145 is located at the top edge of the drying chamber 14, it can also be seen from the streamline diagram that the hot air can enter the drying platform 143 through the air inlet 142 of the drying chamber. The flow of some hot air from bottom to top and from left to right is more conducive to the drying of crops, thereby improving the overall crop drying efficiency.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An agricultural product drying device based on swirl enhancement and distribution control, comprising a hot air generating device (7), characterized in that: The hot air generating device (7) has a hot fluid outlet (4) and a dry air inlet (1) respectively at the middle of its bottom and top ends. A hot fluid inlet (3) and a dry air outlet (2) are located on the outer side of the hot air generating device (7). A biomimetic turbulence structure is provided at the dry air inlet (1). The interior of the hot air generating device (7) is equipped with mutually isolated and symmetrically or asymmetrically arranged double Fermat spiral channels. A conveying pipe (11) is fixedly connected to the outer side of the dry air outlet (2). A diffuser hood (12) is fixedly connected to the top of the channel (11). Inside the diffuser hood (12) are guide vanes (13). A drying chamber (14) is fixedly connected to the top of the diffuser hood (12). Inside the drying chamber (14) are a dry hot air converging channel (141), an air inlet (142), a drying platform (143), and a baffle (144). A dehumidification port (145) is opened on the top of the drying chamber (14). A handle (15) is fixedly connected to the top of the drying platform (143).

2. The agricultural product drying device based on cyclone enhancement and distribution control according to claim 1, characterized in that: The biomimetic turbulence structure includes octopus tentacles (8), octopus suckers (9), and through holes (10). The octopus tentacles (8) have a tapering structure along the length direction from the dry air inlet (1).

3. The agricultural product drying device based on cyclone enhancement and distribution control according to claim 2, characterized in that: The through hole (10) is formed on the surface of the imitation octopus tentacle (8). The outer surface of the imitation octopus tentacle (8) is fixedly connected to one end of the imitation octopus suction cup (9). The imitation octopus suction cup (9) and the through hole (10) are evenly distributed on the surface of the imitation octopus tentacle (8).

4. The agricultural product drying device based on cyclone enhancement and distribution control according to claim 1, characterized in that: The double Fermat spiral channel includes a first Fermat spiral (5) and a second Fermat spiral (6). The spacing between the double Fermat spiral channels varies non-uniformly along the radial direction and gradually decreases from the inside to the outside.

5. The agricultural product drying device based on cyclone enhancement and distribution control according to claim 4, characterized in that: The parametric equation of the first Fermat spiral is: x t =A1*sqrt(t)*cos(t) y t =A2*sqrt(t)*sin(t) Where t∈(0,A3) The parametric equation of the second Fermat spiral is: x t =-A1*sqrt(t)*cos(t) y t =-A2*sqrt(t)*sin(t) In the formula, t∈(0,A3), A1 and A2 are the scale control parameters of Fermat's spiral in the x and y directions, which are used to adjust the expansion speed and overall size of the spiral; A3 is the upper limit of parameter t, which is used to control the number of spiral turns and the total length. The preferred value of A3 is 4π-8π, that is, two to four turns.

6. The agricultural product drying device based on cyclone enhancement and distribution control according to claim 5, characterized in that: The values ​​of A1 and A2 are set according to the size of the hot air generating device (7): When A1=A2, the first Fermat spiral (5) and the second Fermat spiral (6) are in standard symmetry form; When A1≠A2, the first Fermat spiral (5) and the second Fermat spiral (6) are in a stretched form, which is used for asymmetric structural space.

7. The agricultural product drying device based on cyclone enhancement and distribution control according to claim 1, characterized in that: The diffuser (12) has a gradually expanding structure, and its cross-sectional area gradually increases along the airflow direction; the guide vanes (13) are inclined and arranged near the outlet of the diffuser (12), and the guide vanes (13) are inclined flat plate structures or curved structures. An air inlet (142) is opened on the dry hot air converging channel (141), and a baffle (144) is arranged on the drying platform (143) near the dry hot air converging channel (141); the drying platform (143) has an open, mesh or sieve structure, and the exhaust port (145) is located at the top edge of the drying chamber (14). The area of ​​the drying platform (143) gradually increases from bottom to top in the drying chamber (14). The diffusion angle of the diffuser (12) is 30°-45°, and the tilt angle of the guide vanes (13) is 30°-60°.

8. A method for drying agricultural products using a swirl-enhanced and distribution-controlled drying device, characterized in that, Includes the following steps: Step 1: Cold fluid dry air enters through the dry air inlet (1) in the middle of the hot air generating device (7), and is diverted by the biomimetic octopus tentacles (8) of the biomimetic turbulence structure, and forms a microscale vortex with the octopus suction cups (9) and the through hole (10), which destroys the initial boundary layer of the airflow. Step 2: The disturbed dry air enters the double Fermat spiral channel and flows outward from the center; the hot fluid enters from the hot fluid inlet (3) outside the hot air generating device (7) and flows from the outside to the center along the double Fermat spiral channel, forming countercurrent heat exchange with the dry air; Step 3: Dry air is fully heated to form dry hot air, which is discharged from the dry air outlet (2) and transported to the interior of the diffuser (12) through the conveying pipe (11). At the same time, the heat-exchanged hot fluid is discharged from the hot fluid outlet (4). Step 4: The dry hot air is slowed down and evenly distributed in the diffuser (12), and after forming a rotating airflow through the guide vanes (13), it enters the drying chamber (14). The rotating airflow passes through the dry hot air converging channel (141) and the air inlet (142) and passes through the agricultural product layer on the drying table (143). The humid air is discharged from the exhaust port (145). Step 5: After the agricultural products are dried, remove the drying table (143) from the drying chamber (14) using the handle (15) and replace it with the agricultural products to be dried.

9. The method for an agricultural product drying device based on cyclone enhancement and distribution control according to claim 8, characterized in that: The design of the octopus-like suction cup (9) and through hole (10) on the biomimetic turbulence structure described in step one can make the cleaning medium flow into the channel more evenly, thus facilitating the cleaning of the channel. The double Fermat spiral channel described in step two has anti-clogging and online cleaning functions.

10. The method for an agricultural product drying device based on cyclone enhancement and distribution control according to claim 8, characterized in that: The dry air continuously changes its velocity and direction within the double Fermat spiral channel, and the residence time is extended by the radial non-uniform spacing of the channel, thereby enhancing the fluid shearing and mixing effect.

Images