A hot air circulating oven with improved drying and heat utilization
Patent Information
- Application Number
- CN202522147237.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-10-11
AI Technical Summary
[0003]传统的热风循环烘箱虽然结构成熟、操作相对简单，但在实际应用中普遍存在以下问题：为了维持干燥过程的进行并排出湿气，烘箱需要持续引入新风并排出湿热废气，排湿过程不可避免地会带走大量的热量，造成显著的能量浪费，特别是在干燥后期，物料含水率降低，干燥速率下降，若仍维持较大的排湿量，热损失问题更为突出；且现有烘箱在干燥初期，若排湿不足，箱内湿度过高，会抑制水分蒸发，降低干燥速率，在干燥中后期，若排湿过大，大量热空气被直接排出，不仅浪费能源，还可能导致物料表面过干结壳，影响内部水分扩散，反而拖慢整体干燥速度，甚至影响物料品质；对于不同物料或同一物料的不同批次，难以通过调整排湿来优化
[0012]1.该种干燥和热利用率双重提高的热风循环烘箱，通过在烘箱箱体两侧均设有分风腔，且分隔板上呈矩阵分布有通风孔，当电加热器和鼓风机相配合通过进风管和分风支管向分风腔内部吹入热空气，热空气通过两侧分隔板上的通风孔对烘盘上的物料进行烘干，使得物料的干燥效果更好，热空气会上升，并在循环风机的作用下，使得空气通过回风管进入到进风管内部，并在电加热器的作用下二次加热，使得物料的干燥效果更好；通过设有的排湿口和排湿风机可以对干燥的湿气排出，通过设有的可调节开度的排湿间隙调节机构，用于动态调节排湿风机工作时的实际排湿间隙大小，通过调节排湿间隙调节机构的开度，能够同时控制烘箱箱体内参与循环的空气总量以及湿空气的排出量，实现在干燥过程中针对不同物料及其不同干燥状态下优化干燥速率和热利用率。
Smart Images
Figure CN224815271U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hot air circulating oven technology, specifically a hot air circulating oven that improves both drying efficiency and heat utilization. Background Technology
[0002] Hot air circulating ovens, as a classic drying equipment, are widely used in pharmaceuticals, chemicals, food, light industry, electronics, and many other industries to complete key process steps such as dehumidification, drying, curing, and sterilization of materials. Their basic principle is to use an electric heater to generate heat, which is then forced by a fan to circulate air within the oven. The hot air flows through the gaps between the drying trays carrying the materials, exchanging heat with the materials and carrying away the moisture they release, thus achieving the drying purpose.
[0003] While traditional hot air circulating ovens have mature structures and are relatively simple to operate, they generally suffer from the following problems in practical applications: To maintain the drying process and remove moisture, the oven needs to continuously introduce fresh air and expel hot, humid waste gas. The dehumidification process inevitably carries away a large amount of heat, resulting in significant energy waste. This is especially true in the later stages of drying, when the moisture content of the material decreases and the drying rate drops. If a large amount of dehumidification is maintained, the heat loss problem becomes even more prominent. Furthermore, in the early stages of drying, insufficient dehumidification in existing ovens leads to excessively high humidity inside the oven, which inhibits moisture evaporation and reduces the drying rate. In the middle and later stages of drying, excessive dehumidification results in a large amount of hot air being directly discharged, which not only wastes energy but may also cause the material surface to become too dry and crusty, affecting internal moisture diffusion and slowing down the overall drying speed, or even affecting the quality of the material. It is also difficult to optimize the dehumidification process by adjusting it for different materials or different batches of the same material. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides a hot air circulating oven that improves both drying efficiency and heat utilization.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0006] This utility model discloses a hot air circulating drying oven with improved drying and heat utilization rates. It includes an oven body, a blower, an electric heater, and an air inlet pipe. The blower is connected to the oven body via the air inlet pipe, and the electric heater is installed inside the air inlet pipe. The oven body has partitions on both sides, dividing the interior cavity into a storage drying chamber and two side air distribution chambers. The storage drying chamber contains at least one layer of drying trays for holding materials. The air outlet of the air inlet pipe is connected to the two side air distribution chambers via branch pipes. Several ventilation holes are arranged in a matrix on the partitions. A circulating fan is located at the top center of the oven body, and its outlet is connected to a return air pipe connected to the air inlet pipe. The outlet of the return air pipe is connected between the blower and the electric heater. The oven body has a dehumidification port with a dehumidification fan installed thereon. The dehumidification port also has an adjustable dehumidification gap adjustment mechanism.
[0007] As a preferred embodiment of this utility model, the dehumidification gap adjustment mechanism includes two symmetrically arranged baffles on the outer wall of the oven, and a gap adjustment component for driving the two baffles to move is provided on the outer wall of the oven.
[0008] As a preferred embodiment of this utility model, the gap adjustment assembly includes two symmetrical hydraulic cylinders installed on the outer wall of the oven, and the output shaft of the hydraulic cylinders is connected to the middle of the baffle plate.
[0009] As a preferred technical solution of this utility model, the outer wall of the oven body is provided with two guide slide rods located on both sides of the dehumidification port, and both sides of the two baffles are provided with guide sleeves for the guide slide rods to pass through.
[0010] As a preferred technical solution of this utility model, the baking tray is configured as a multi-layered structure, with a gap for the circulation of heated air between adjacent layers.
[0011] The beneficial effects of this utility model are:
[0012] 1. This type of hot air circulating oven, which improves both drying efficiency and heat utilization, features air distribution chambers on both sides of the oven body, with ventilation holes arranged in a matrix on the partition plates. When the electric heater and blower work together, hot air is blown into the air distribution chambers through the inlet pipe and branch pipes. The hot air dries the materials on the drying trays through the ventilation holes on the partition plates, resulting in better drying. The hot air rises and, under the action of the circulating fan, enters the inlet pipe through the return pipe, where it is reheated by the electric heater, further improving the drying effect. The oven also features a dehumidification port and a dehumidification fan to expel moisture. An adjustable dehumidification gap adjustment mechanism dynamically adjusts the actual dehumidification gap size during operation. By adjusting the opening of the dehumidification gap adjustment mechanism, the total amount of air circulating within the oven and the amount of humid air discharged can be controlled simultaneously, optimizing the drying rate and heat utilization for different materials and under different drying conditions.
[0013] 2. This type of hot air circulating oven, which improves both drying and heat utilization efficiency, allows for adjustment of the size of the exhaust port by having the output shaft of the hydraulic cylinder drive the baffle plate along the guide slide rod. This adjustment allows for the adjustment of the gap between the two baffle plates, thereby adjusting the size of the exhaust port. The guide sleeve moves along the guide slide rod, improving the stability of the baffle plate movement. Attached Figure Description
[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0015] Figure 1 This is a schematic diagram of the structure of a hot air circulating oven that improves both drying and heat utilization efficiency according to this utility model;
[0016] Figure 2 This is a structural cross-sectional view of a hot air circulating oven that improves both drying and heat utilization efficiency according to this utility model;
[0017] Figure 3 This is a schematic diagram of the dehumidification gap adjustment mechanism of a hot air circulating oven that improves both drying and heat utilization efficiency according to this utility model.
[0018] In the diagram: 1. Oven body; 2. Blower; 3. Electric heater; 4. Air inlet pipe; 5. Divider plate; 6. Storage drying chamber; 7. Air distribution chamber; 8. Drying tray; 9. Branch air pipe; 10. Ventilation hole; 11. Circulating fan; 12. Return air pipe; 13. Exhaust outlet; 14. Exhaust fan; 15. Exhaust gap adjustment mechanism; 16. Baffle plate; 17. Hydraulic cylinder; 18. Guide slide rod; 19. Guide sleeve. Detailed Implementation
[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0020] Example: Figure 1 , Figure 2 and Figure 3 As shown, this utility model discloses a hot air circulating drying oven with dual improvements in drying and heat utilization. It includes an oven body 1, a blower 2, an electric heater 3, and an air inlet pipe 4. The blower 2 is connected to the oven body 1 via the air inlet pipe 4. The electric heater 3 is installed inside the air inlet pipe 4. Partition plates 5 are provided on both sides of the interior of the oven body 1. The interior cavity of the oven body 1 is divided by the partition plates 5 into a storage drying chamber 6 and air distribution chambers 7 located on both sides of the storage drying chamber 6. The storage drying chamber 6 has at least one layer of drying trays 8 for holding materials. The air outlet of the air inlet duct 4 is connected to two air distribution chambers 7 on both sides via branch air ducts 9. Several ventilation holes 10 are arranged in a matrix on the partition plate 5. A circulating fan 11 is located at the top center of the oven body 1. The air outlet of the circulating fan 11 is connected to a return air duct 12 connected to the air inlet duct 4. The air outlet of the return air duct 12 is connected between the blower 2 and the electric heater 3. The oven body 1 is provided with a dehumidification port 13, and a dehumidification fan 14 is installed at the dehumidification port 13. An adjustable dehumidification gap regulator is also provided at the dehumidification port 13. Structure 15, with air distribution chambers 7 on both sides of the oven body 1, and ventilation holes 10 arranged in a matrix on the partition plates 5, when the electric heater 3 and the blower 2 cooperate, hot air is blown into the air distribution chambers 7 through the air inlet pipe 4 and the branch air pipes 9. The hot air dries the material on the drying trays 8 through the ventilation holes 10 on the partition plates 5 on both sides, making the drying effect of the material better. The hot air will rise, and under the action of the circulating fan 11, the air will enter the air inlet pipe 4 through the return air pipe 12, and under the action of the electric heater 3, the material will dry. Secondary heating improves the drying effect of the material. The moisture can be discharged through the exhaust port 13 and the exhaust fan 14. The adjustable exhaust gap adjustment mechanism 15 is used to dynamically adjust the actual exhaust gap size of the exhaust fan 14 during operation. By adjusting the opening of the exhaust gap adjustment mechanism 15, the total amount of air circulating in the oven 1 and the amount of humid air discharged can be controlled at the same time, so as to optimize the drying rate and heat utilization rate for different materials and different drying conditions during the drying process.
[0021] The dehumidification gap adjustment mechanism 15 includes two symmetrically arranged baffles 16 on the outer wall of the oven body 1. A sealing ring is provided at the edge of the baffle 16 that abuts against the oven body 1, and a sealing strip is provided on the opposite surfaces of the two baffles 16. A gap adjustment assembly for driving the movement of the two baffles 16 is provided on the outer wall of the oven body 1. The gap adjustment assembly includes two symmetrically arranged hydraulic cylinders 17 installed on the outer wall of the oven body 1. The output shaft of the hydraulic cylinders 17 is connected to the middle of the baffles 16. Two guide rods 18 are located on both sides of the dehumidification port 13 on the outer wall of the oven body 1. Guide sleeves 19 are provided on both sides of the two baffles 16 for the guide rods 18 to pass through. When adjusting the size of the dehumidification port 13, the output shaft of the hydraulic cylinder 17 drives the baffles 16 to move along the guide rods 18, thereby adjusting the gap between the two baffles 16 and thus adjusting the size of the dehumidification port 13. The guide sleeves 19 move along the guide rods 18, improving the stability of the movement of the baffles 16.
[0022] The baking tray 8 is configured as a multi-layered structure, with a gap for heating air circulation between adjacent layers. Support blocks are provided on the opposite sides of the two partition plates 5, and the baking tray 8 is placed on the support blocks of the same layer.
[0023] During operation, this type of hot air circulating oven, which improves both drying efficiency and heat utilization, features air distribution chambers 7 on both sides of the oven body 1, with ventilation holes 10 arranged in a matrix on the partition plates 5. When the electric heater 3 and the blower 2 work together, hot air is blown into the air distribution chambers 7 through the air inlet pipe 4 and the branch pipes 9. The hot air dries the material on the drying trays 8 through the ventilation holes 10 on the partition plates 5, resulting in better drying. The hot air rises and, under the action of the circulating fan 11, enters the air inlet pipe 4 through the return air pipe 12, where it is reheated by the electric heater 3, further improving the drying effect. The moisture from the drying process is discharged through the exhaust port 13 and the exhaust fan 14. The adjustable opening of the dehumidification gap adjustment mechanism 15 allows the output shaft of the hydraulic cylinder 17 to drive the baffle plate 16 to move along the guide slide rod 18 when adjusting the size of the dehumidification port 13. This adjusts the gap between the two baffle plates 16, thereby adjusting the size of the dehumidification port 13. The guide sleeve 19 moves along the guide slide rod 18, improving the stability of the movement of the baffle plate 16. This is used to dynamically adjust the actual dehumidification gap size when the dehumidification fan 14 is working. By adjusting the opening of the dehumidification gap adjustment mechanism 15, the total amount of air circulating in the oven body 1 and the amount of humid air discharged can be controlled simultaneously, thereby optimizing the drying rate and heat utilization rate for different materials and different drying conditions during the drying process.
[0024] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A hot air circulating drying oven with dual improvements in drying and heat utilization, comprising an oven body (1), a blower (2), an electric heater (3), and an air inlet pipe (4), wherein the blower (2) is connected to the oven body (1) via the air inlet pipe (4), and the electric heater (3) is installed inside the air inlet pipe (4), characterized in that, The oven body (1) has partition plates (5) on both sides inside. The inner cavity of the oven body (1) is divided into a storage drying chamber (6) and air distribution chambers (7) on both sides of the storage drying chamber (6) by the partition plates (5). The storage drying chamber (6) has at least one layer of drying trays (8) for carrying materials. The air outlet of the air inlet pipe (4) is connected to the two air distribution chambers (7) on both sides through the air distribution branch pipe (9). Several ventilation holes (10) are arranged in a matrix on the partition plate (5). A circulating fan (11) is provided at the top center of the oven body (1). The air outlet of the circulating fan (11) is connected to a return air pipe (12) connected to the air inlet pipe (4). The air outlet of the return air pipe (12) is connected between the blower (2) and the electric heater (3). The oven body (1) is provided with a dehumidification port (13), a dehumidification fan (14) is installed at the dehumidification port (13), and a dehumidification gap adjustment mechanism (15) with adjustable opening is also provided at the dehumidification port (13).
2. The hot air circulating oven with dual improvements in drying and heat utilization rate as described in claim 1, characterized in that, The dehumidification gap adjustment mechanism (15) includes two symmetrically arranged baffles (16) on the outer wall of the oven body (1), and a gap adjustment component for driving the two baffles (16) to move is provided on the outer wall of the oven body (1).
3. The hot air circulating oven with dual improvements in drying and heat utilization rate as described in claim 2, characterized in that, The gap adjustment assembly includes two symmetrical hydraulic cylinders (17) installed on the outer wall of the oven body (1), and the output shaft of the hydraulic cylinders (17) is connected to the middle of the baffle plate (16).
4. The hot air circulating oven with dual improvements in drying and heat utilization rate as described in claim 3, characterized in that, The outer wall of the oven body (1) shown is provided with two guide slide rods (18) located on both sides of the vent (13), and both sides of the two baffles (16) are provided with guide sleeves (19) through which the guide slide rods (18) pass.
5. The hot air circulating oven with dual improvements in drying and heat utilization rate according to claim 1, characterized in that, The baking tray (8) is configured as a multi-layered structure, with a gap between adjacent layers for the circulation of heated air.