A hot-air drying apparatus for dehydrating vegetables
By designing the inner and outer cylinder structure and the circulation system, the problems of uneven hot air distribution and unused waste heat were solved, achieving uniform dehydration and efficient drying of vegetables and reducing energy waste.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN LULAI AGRICULTURAL DEVELOPMENT CO LTD
- Filing Date
- 2025-06-17
- Publication Date
- 2026-06-23
AI Technical Summary
Existing dehydrated vegetable drying equipment suffers from uneven hot air distribution and failure to recover and utilize waste heat, resulting in low drying efficiency and energy waste.
The system employs an inner and outer cylinder structure and a circulation system. It achieves uniform distribution of hot air and internal and external air circulation through the first and second heating grilles and the fan structure. Temperature control is achieved by heating the grilles with electric heating wires. Combined with the air guide plate and filter structure, it ensures uniform distribution of hot air and filtration of residue.
This method achieves uniform dehydration of vegetables, improves drying efficiency, shortens drying time, effectively utilizes waste heat, and reduces production costs.
Smart Images
Figure CN224386691U_ABST
Abstract
Description
Technical Field
[0001] This utility model applies to the field of drying equipment and provides a hot air drying device for dehydrated vegetables. Background Technology
[0002] Dehydrated vegetables, also known as rehydrated vegetables, are dried vegetables made by washing, dehydrating, and drying fresh vegetables to remove most of their water content. During processing, hot air is used to dry the vegetables, removing internal moisture and keeping them dry, which is beneficial for processing and long-term storage. Existing hot air drying equipment for dehydrated vegetables mainly has the following two problems;
[0003] Existing drying equipment typically uses single-point or localized air supply, resulting in uneven hot air distribution within the drying chamber. Vegetables near the hot air outlet may be over-dried or even scorched due to excessively high temperatures, while vegetables farther from the outlet may be under-dried due to insufficient temperatures. This uneven drying effect not only reduces the quality of the vegetables but also prolongs the overall drying time, leading to low drying efficiency.
[0004] In existing drying equipment, hot air is discharged after one use without recovering or reusing the residual heat, resulting in serious energy waste. Furthermore, a large amount of hot air is not fully recycled and is directly discharged into the environment, which not only wastes energy but also increases production costs. Utility Model Content
[0005] To address the aforementioned deficiencies, the present invention aims to provide a hot air drying device for dehydrated vegetables, in order to solve the problems mentioned in the background art. The device includes an outer cylinder and an inner cylinder fixedly connected inside the outer cylinder; both the top of the outer cylinder and the inner cylinder are provided with openings; the bottom and sides of the outer cylinder are respectively provided with air inlets and air outlets; and a fan structure is installed at the bottom of the inner cylinder.
[0006] A circulation chamber is provided between the inner wall of the outer cylinder and the inner cylinder. A first heating grid is installed between the inner bottom of the outer cylinder and the inner cylinder, and a second heating grid is installed between the inner top of the outer cylinder and the inner cylinder. A detachable top cover is installed on the top of the outer cylinder, and several storage trays at different heights are installed at the bottom of the top cover.
[0007] Furthermore, both the first heating grid and the second heating grid are provided with a number of oblique grid holes.
[0008] Furthermore, both the first heating grille and the second heating grille are equipped with heating wires inside.
[0009] Furthermore, the area inside the first heating grille is a mixing chamber; the air inlet includes a first air inlet and a second air inlet, which correspond to the circulation chamber and the mixing chamber, respectively.
[0010] Furthermore, a connecting rod is fixedly connected to the bottom of the top cover, and several storage trays are evenly arranged along the height direction of the connecting rod.
[0011] Furthermore, the inner wall of the inner cylinder is provided with a number of inclined air guide plates along the height direction of the inner cylinder. The air guide plates are annular, and the number of air guide plates corresponds one-to-one with the storage tray.
[0012] Furthermore, the storage tray is evenly provided with mesh holes, the outer periphery of the storage tray is provided with an edge, and a number of rings are evenly provided on the outer side of the edge. A number of hanging cables are fixedly connected to the bottom of the top cover, and a number of stops corresponding to the rings are fixedly connected to the hanging cables.
[0013] Furthermore, a filter screen structure is provided between the outer wall of the inner cylinder and the inner wall of the outer cylinder.
[0014] Furthermore, the top of the top cover is fixedly connected with several lifting rings.
[0015] This invention effectively solves the problem of uneven hot air distribution in existing drying equipment through its unique inner and outer cylinder structure and circulation system. The synergistic effect of the inner and outer cylinders ensures that hot air is evenly distributed within the inner cylinder, preventing over-drying and scorching of vegetables due to localized excessively high temperatures. Simultaneously, it ensures that vegetables far from the hot air outlet also receive sufficient heat, achieving uniform dehydration throughout the entire drying space. This not only significantly improves the quality of dehydrated vegetables but also greatly shortens drying time and increases drying efficiency. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the side section structure of the equipment;
[0017] Figure 2 This is a side-section three-dimensional structural diagram of the equipment;
[0018] Figure 3 for Figure 2 Enlarged view of the A-section structure;
[0019] Figure 4 for Figure 2 Enlarged view of the structure of section B;
[0020] In the diagram: 1-Outer cylinder; 10-Circulation chamber; 11-First air inlet; 12-Second air inlet; 13-Air outlet; 2-Inner cylinder; 20-Inner chamber; 21-Air guide plate; 30-Mixing chamber; 31-First heating grille; 32-Second heating grille; 321-Angled grille hole; 4-Filter structure; 40-Air inlet chamber; 5-Top cover; 51-Hanging ring; 6-Dispensing tray; 61-Mesh hole; 62-Edge; 621-Ring body; 7-Fan structure; 8-Connecting rod; 9-Hanging cable; 91-Block. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0022] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] Furthermore, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.
[0025] See Figure 1-4 The purpose of this utility model is to provide a hot air drying device for dehydrated vegetables, including an outer cylinder 1 and an inner cylinder 2 fixedly connected inside the outer cylinder 1; the top of the inner cylinder 2 is provided with an opening; the bottom of the outer cylinder 1 is provided with an air inlet, and the side of the outer cylinder 1 is provided with an air outlet 13. The bottom of the inner cylinder 2 is welded to the inner bottom of the outer cylinder 1 through a support column.
[0026] A gap is provided between the inner wall of the outer cylinder 1 and the outer wall of the inner cylinder 2, which is a circulation chamber 10. A gap is provided between the inner bottom of the outer cylinder 1 and the bottom of the inner cylinder 2, and a first heating grid 31 is fixedly connected in the gap. A gap is provided between the inner top of the outer cylinder 1 and the top of the inner cylinder 2, and a second heating grid 32 is fixedly connected in the gap.
[0027] In other words, a first heating grid 31 is fixedly connected to the inner bottom of the outer cylinder 1, and the top of the first heating grid 31 is fixedly connected to the bottom surface of the inner cylinder 2. Similarly, a second heating grid 32 is fixedly connected to the inner top of the outer cylinder 1, and the bottom of the second heating grid 32 is fixedly connected to the top surface of the inner cylinder 2, and the top diameter of the inner cylinder 2 matches the diameter of the second heating grid 32.
[0028] Specifically, both the first heating grille 31 and the second heating grille 32 are annular structures, with several oblique grille holes 321 formed by uniformly and obliquely arranged grille intervals on their sidewalls. Both the first heating grille 31 and the second heating grille 32 are capable of generating heat. Specifically, heating wires are installed inside the obliquely arranged grilles; energizing the heating wires will generate heat, thereby raising the temperature of the entire device's interior.
[0029] A fan structure 7 is fixedly installed at the bottom of the inner cylinder 2. The fan structure 7 can draw air from the circulation chamber 10 into the inner cylinder 2, or draw air from the inner cylinder 2 into the circulation chamber 10.
[0030] The outer cylinder 1 has an opening at its top, and a top cover 5 is installed at the top opening of the outer cylinder 1. Several storage trays 6 at different heights are fixedly connected to the bottom of the top cover 5, and the storage trays 6 can extend into the interior of the inner cylinder 2. In addition, the edge of the top cover 5 is provided with a sealing mechanism, which can form a good sealing effect when the top cover 5 is closed on the top of the outer cylinder 1.
[0031] In summary, this device can realize both internal and external air circulation processes. In specific implementation, the first heating grille 31 and the second heating grille 32 can heat the air inside the device, while the fan structure 7 can drive the air with a certain amount of heat to circulate internally inside the device to dry the items on the tray 6. When the gas reaches a certain temperature and humidity, the device can switch to external circulation mode to discharge the gas with heat and moisture and reintroduce relatively dry circulating gas for secondary and subsequent internal circulation.
[0032] Example 1
[0033] To make the description clearer, the following is a naming explanation of the various areas inside the device:
[0034] A gap is provided between the inner wall of the outer cylinder 1 and the outer wall of the inner cylinder 2, which is a circulation chamber 10; the area inside the first heating grid 31 is a mixing chamber 30; the area inside the second heating grid 32 and the area communicating with the inside of the inner cylinder 2 are inner chambers 20.
[0035] In actual use, the top cover 5, along with several connected trays 6, is simultaneously lifted using a hoisting device, such as a large gantry crane. Workers can then evenly place the food to be dehydrated onto the trays 6. The top cover 5 is then replaced on top of the outer cylinder 1, completing the initial preparation for food dehydration. Subsequently, the fan structure 7, the first heating grille 31, and the second heating grille 32 are activated, simultaneously heating and circulating air. The airflow direction driven by the fan structure 7 is: inner chamber 20 → mixing chamber 30 → circulation chamber 10 → inner chamber 20; that is, the air flows downwards within the inner cylinder 2. During this process, the moisture-laden gas flowing from the inner chamber 20 collides downwards with the bottom of the outer cylinder 1, mixing in the mixing chamber 30. This ensures a uniform moisture content in the gas, allowing the high-speed gas to contain more moisture. Furthermore, the inclined grille holes 321 enable the gas to be transported upwards more evenly within the circulation chamber 10. It then enters the inner chamber 20 again through the second heating grille 32, thus circulating.
[0036] After a certain period of internal circulation, the moisture content of the gas inside the device tends to be saturated. At this time, the valves on the pipes connected to the air inlet and air outlet 13 are opened. Since the air inlet is connected to an external gas delivery device, dry and clean gas enters the device through the air inlet under the action of the external fan, and then exits through the air outlet 13. New dry air is then added, and after sufficient exhaust, all valves are closed, and the subsequent gas internal circulation steps are carried out. This process is repeated multiple times until the internal food is dehydrated.
[0037] Preferably, the air inlet includes a first air inlet 11 and a second air inlet 12. The first air inlet 11 and the second air inlet 12 correspond to the circulation chamber 10 and the mixing chamber 30, respectively. Specifically, during external gas circulation, the air drive direction of the fan structure 7 is upward, which ensures that dry and warm air flows upward.
[0038] Preferably, a filter structure 4 is provided between the outer side wall of the inner cylinder 2 and the inner side wall of the outer cylinder 1. Since flying residues will occur during the food drying and dehydration process and the external air circulation, the filter structure 4 can intercept the residues at the bottom of the filter structure 4. During the food drying and dehydration process and the external air circulation, it can effectively intercept the flying residues generated by the food, prevent the residues from accumulating in the internal space such as the circulation chamber, avoid affecting the normal operation of the equipment and the heating and circulation efficiency, keep the inside of the device clean at all times, facilitate maintenance and cleaning, and meet the strict requirements of food processing for a hygienic environment.
[0039] Preferably, the top of the top cover 5 is fixedly connected with several lifting rings 51, which can be used by a gantry crane to cooperate with the lifting rings 51 to complete the lifting and transportation of the top cover 5, greatly improving the working efficiency of the equipment when loading and unloading food materials.
[0040] Preferably, the bottom of the top cover 5 is fixedly connected to a connecting rod 8, and several trays 6 are evenly arranged in the height direction of the connecting rod 8. The arrangement of multiple trays 6 allows the food placed on the trays 6 to be evenly distributed in the drying space, ensuring that the hot air can fully and evenly contact the food, thereby achieving a more efficient and uniform air drying and dehydration effect.
[0041] Preferably, on the inner wall of the inner cylinder 2, there are several inclined air guide plates 21 arranged along the height direction of the inner cylinder 2. The air guide plates 21 are annular, and the several air guide plates 21 correspond one-to-one with the storage trays 6. The air guide plates 21 can guide the downward airflow to each storage tray 6, thereby achieving more uniform drying of the food on each storage tray 6.
[0042] Preferably, the tray 6 is provided with a mesh 61 evenly distributed, the outer periphery of the tray 6 is provided with an edge 62, and a plurality of rings 621 are evenly distributed on the outer side of the edge 62. A plurality of hanging cables 9 are fixedly connected to the bottom of the top cover 5, and a plurality of stops 91 corresponding to the rings 621 are fixedly connected to the hanging cables 9. The top surface of the stops 91 can abut against the rings 621 to play a limiting role.
[0043] In summary, during actual use, the operator uses a gantry crane and lifting ring 51 to lift the top cover 5 along with the tray 6. The vegetables to be dehydrated are then evenly placed on the tray 6, and the top cover 5 is then placed on top of the outer cylinder 1. At this point, the sealing mechanism functions to ensure the device's airtightness. Subsequently, the operator activates the fan structure 7, the first heating grille 31, and the second heating grille 32. This initiates internal air circulation, meaning the air inside the inner cylinder 2 flows from top to bottom, drying and removing some of the moisture from the food. The moisture-laden air flows downwards to the mixing chamber 30, where it mixes to achieve a uniform moisture content. Under the action of the inclined grille holes 321, it is transported upwards to the circulation chamber 10, and then re-enters the inner chamber 20 through the second heating grille 32 for further circulation, thus achieving internal circulation for drying and dehydrating the vegetables on the tray 6.
[0044] After the internal circulation has lasted for a certain period of time, the gas inside the device becomes saturated with moisture. The valve on the pipe connected to the air inlet and outlet 13 is then opened. Under the action of the external fan, gas enters through the air inlet and exits through the outlet 13, introducing dry air. At this time, the fan structure 7 can be changed to blow a gentle upward airflow, ensuring that dry and warm air flows upward, completing the external circulation. Afterward, the valve is closed, and the internal circulation continues, repeating this process multiple times until the vegetables are dehydrated.
[0045] Furthermore, the device can be connected to the circulation chamber 10 and the mixing chamber 30 via the first air inlet 11 and the second air inlet 12, respectively. During external gas circulation, the fan structure 7 blows air upwards, causing the dry hot air to flow upwards, effectively improving the external circulation efficiency. Simultaneously, the filter structure 4 between the outer wall of the inner cylinder 2 and the inner wall of the outer cylinder 1 intercepts flying residue during food drying and external air circulation, preventing its accumulation in the internal space, ensuring normal operation and heating and circulation efficiency of the equipment, and facilitating maintenance and cleaning, meeting the hygiene requirements of food processing. Several trays 6 are evenly arranged along the height direction on the connecting rod 8 at the bottom of the top cover 5, ensuring that the food is evenly distributed in the drying space and fully and evenly contacts the hot air, improving the drying and dehydration efficiency. Annular air guide plates 21, corresponding one-to-one with the trays 6, are inclined along the height direction on the inner wall of the inner cylinder 2, guiding the downward airflow to evenly act on the food on each tray 6, further enhancing the drying effect. The uniform mesh 61 on the tray 6, the outer edge 62, and the ring 621, together with the hanging cable 9 and the stop block 91 at the bottom of the top cover 5, play a limiting role, ensuring the stability of the tray 6 and ensuring uniform and efficient drying of dehydrated vegetables during the drying process.
[0046] Of course, there may be other embodiments of this utility model. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, but these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.
Claims
1. A hot air drying device for dehydrated vegetables, characterized in that, It includes an outer cylinder (1) and an inner cylinder (2) fixedly connected inside the outer cylinder (1); both the outer cylinder (1) and the inner cylinder (2) have openings at the top; the bottom and sides of the outer cylinder (1) are respectively provided with an air inlet and an air outlet (13); a fan structure (7) is installed at the bottom of the inner cylinder (2); A circulation chamber (10) is provided between the inner wall of the outer cylinder (1) and the inner cylinder (2). A first heating grid (31) is installed between the inner bottom of the outer cylinder (1) and the inner cylinder (2). A second heating grid (32) is installed between the inner top of the outer cylinder (1) and the inner cylinder (2). A detachable top cover (5) is installed on the top of the outer cylinder (1). Several storage trays (6) at different heights are installed at the bottom of the top cover (5).
2. The hot air drying equipment for dehydrated vegetables according to claim 1, characterized in that, The first heating grid (31) and the second heating grid (32) are evenly provided with a plurality of oblique grid holes (321).
3. The hot air drying equipment for dehydrated vegetables according to claim 1, characterized in that, Both the first heating grid (31) and the second heating grid (32) are equipped with heating wires inside.
4. The hot air drying equipment for dehydrated vegetables according to claim 1, characterized in that, The area inside the first heating grille (31) is a mixing chamber (30); the air inlet includes a first air inlet (11) and a second air inlet (12), the first air inlet (11) and the second air inlet (12) respectively correspond to the circulation chamber (10) and the mixing chamber (30).
5. The hot air drying equipment for dehydrated vegetables according to claim 1, characterized in that, The bottom of the top cover (5) is fixedly connected to a connecting rod (8), and the storage tray (6) has several of them evenly arranged in the height direction of the connecting rod (8).
6. The hot air drying equipment for dehydrated vegetables according to claim 1, characterized in that, The inner wall of the inner cylinder (2) is provided with several inclined air guide plates (21) along the height direction of the inner cylinder (2). The air guide plates (21) are annular, and several air guide plates (21) correspond one-to-one with the storage tray (6).
7. The hot air drying equipment for dehydrated vegetables according to claim 1, characterized in that, The storage tray (6) is evenly provided with mesh holes (61), the outer periphery of the storage tray (6) is provided with an edge (62), and a number of rings (621) are evenly provided on the outer side of the edge (62). A number of hanging cables (9) are fixedly connected to the bottom of the top cover (5), and a number of stops (91) corresponding to the rings (621) are fixedly connected to the hanging cables (9).
8. The hot air drying equipment for dehydrated vegetables according to claim 1, characterized in that, A filter structure (4) is provided between the outer side wall of the inner cylinder (2) and the inner side wall of the outer cylinder (1).
9. The hot air drying equipment for dehydrated vegetables according to claim 1, characterized in that, The top of the top cover (5) is fixedly connected with several lifting rings (51).