Low carbon curing barn with orifice plate current sharing type positive and negative rotation circulating air duct
Patent Information
- Application Number
- CN202522600509.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-08
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-08
AI Technical Summary
[0003]传统的烤烟房热风循环系统一般是在装烟室的一侧顶部和底部设置循环风机，通过风机顶部排风底部进风，或顶部进风底部排风的方式实现气流循环，但该种方式使得风量及风速越靠近风机越大，越远离风机越小，容易在烤房内形成局部高速区和静态死去，致使烟叶烘烤品质不一
本实用新型在正反转循环风机的基础上，在装烟室底部和顶部设置均风孔板，结合流体力学原理，通过在孔板前后形成稳定的压力降，使得气流能够均匀通过每一个通风孔，进而将循环风机的“点”或“面”源射流，转换为覆盖整个装烟室横截面的“体”源均匀流，彻底消除气流死角和不均匀区，使得装烟室内烟叶所受热风和湿度条件完全一致，品质高度均一，同时由于热量被高效、均匀的利用，避免了任何区域的能量浪费，综合节能率相较于传统烤房可提升20%~30%。
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Figure CN224891832U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tobacco processing technology, and in particular to a low-carbon curing barn with a perforated plate uniform flow type forward and reverse reversing circulating air duct. Background Technology
[0002] The tobacco curing barn is an essential production facility for tobacco production. The hot air circulation device is an important piece of equipment in the tobacco loading chamber. The efficiency of the hot air circulation device directly affects the temperature and humidity difference in the tobacco loading chamber, and thus affects the quality of tobacco curing.
[0003] Traditional hot air circulation systems in tobacco curing barns typically involve installing circulating fans at the top and bottom of one side of the loading chamber. Airflow is circulated by either exhausting air from the top and intake air from the bottom, or intake air from the top and exhaust air from the bottom. However, this method results in a larger air volume and velocity closer to the fan and a smaller air volume further away from the fan, which can easily create localized high-speed zones and static dead zones within the curing barn, leading to inconsistent tobacco curing quality. Utility Model Content
[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present invention provides a low-carbon baking oven with a perforated plate uniform flow forward and reverse reversing circulation air duct.
[0005] To achieve the above objectives, this utility model provides a low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct, comprising: A tobacco loading chamber is located inside the curing barn. A first air duct is provided between the bottom of the tobacco loading chamber and the bottom of the curing barn, and a second air duct is provided between the top of the tobacco loading chamber and the top of the curing barn. A uniform air distribution plate is horizontally disposed at the bottom and top of the smoke loading chamber, and its planar area is equal to the cross-sectional area of the smoke loading chamber. Multiple ventilation holes are uniformly disposed on the uniform air distribution plate. The ventilation holes are used for air flow between the first air duct and the smoke loading chamber and between the second air duct and the smoke loading chamber. The first circulating fan is installed on the side wall of the drying oven and near the bottom of the drying oven. The first circulating fan is connected to the first air duct. The second circulating fan is installed on the side wall of the drying oven and near the top of the drying oven. The second circulating fan is connected to the second air duct. The heating system is located outside the drying room and is used to provide heat to the inside of the drying room.
[0006] Preferably, the perforation rate of the air distribution plate is 30% to 50%.
[0007] Preferably, the ventilation hole is a circular hole, an elongated hole, or a diamond-shaped hole.
[0008] Preferably, the length of the ventilation hole is in the range of 6~10mm.
[0009] Preferably, the distance between the centers of two adjacent ventilation holes is in the range of 10~14mm.
[0010] Preferably, the air distribution perforated plate comprises a 1.2mm thick galvanized steel plate or aluminum alloy plate.
[0011] Preferably, multiple temperature and humidity sensors are provided at intervals in the smoke-filling chamber.
[0012] Preferably, a dehumidification window is provided on the side wall of the drying oven, the dehumidification window is located near the top of the drying oven, and is located on both sides of the second circulating fan.
[0013] Preferably, the first circulating fan and the second circulating fan are used to rotate forward and reverse synchronously. When rotating forward, the first circulating fan is used to intake air and the second circulating fan is used to exhaust air.
[0014] Preferably, the first circulating fan and the second circulating fan are mixed-flow fans.
[0015] Based on this, the beneficial effects of this utility model are as follows: This invention, based on a reversible circulating fan, incorporates air distribution perforated plates at the bottom and top of the tobacco loading chamber. By applying fluid mechanics principles and creating a stable pressure drop before and after the perforated plates, airflow is uniformly distributed through each ventilation hole. This transforms the point or surface jet of the circulating fan into a uniform volumetric flow covering the entire cross-section of the tobacco loading chamber, completely eliminating dead zones and uneven airflow areas. This ensures that the hot air and humidity conditions received by the tobacco leaves within the loading chamber are completely consistent, resulting in highly uniform quality. Furthermore, because heat is utilized efficiently and evenly, energy waste in any area is avoided, leading to an overall energy saving rate that is 20% to 30% higher than traditional curing barns. Attached Figure Description
[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic plan view of a drying room according to one embodiment of the present invention; Figure 2 The schematic diagram shows a side view of a drying room according to one embodiment of the present invention; Figure 3 A schematic plan view of an air distribution perforated plate according to one embodiment of the present invention; Explanation of reference numerals in the attached drawings: 10-Smoke chamber, 20-First air duct, 30-Second air duct, 40-Air distribution plate, 401-Ventilation hole, 50-First circulating fan, 60-Second circulating fan, 70-Heating system, 80-Temperature and humidity sensor, 90-Dehumidification window. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0018] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms "a," "the," and "the" as used in the embodiments of this application are also intended to include the plural forms unless the context clearly indicates otherwise.
[0019] It should be understood that although the terms first, second, third, etc., may be used to describe related structures in the embodiments of this application, these related structures should not be limited to these terms. These terms are only used to distinguish related structures from each other.
[0020] Depending on the context, the word "if" as used here can be interpreted as "when" or "when". Similarly, depending on the context, the phrase "if determined" can be interpreted as "when determined" or "when (the condition or event of the statement) is detected".
[0021] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is formed "upper" or "lower" of another element, it can not only be formed directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element.
[0022] Figure 1 This is a schematic plan view of a drying room according to one embodiment of the present invention. Figure 2 This schematic diagram shows a side view of a drying oven according to one embodiment of the present invention. Figure 3 This is a schematic plan view of an air distribution perforated plate according to one embodiment of the present invention, as shown below. Figure 1-3 As shown, the present invention discloses a low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct, comprising: The tobacco loading chamber 10 is located inside the curing barn. A first air duct 20 is provided between the bottom of the tobacco loading chamber 10 and the bottom of the curing barn, and a second air duct 30 is provided between the top of the tobacco loading chamber 10 and the top of the curing barn. The air distribution plate 40 is horizontally set at the bottom and top of the smoke chamber 10, and its plane area is equal to the cross-sectional area of the smoke chamber 10. Multiple ventilation holes 401 are evenly arranged on the air distribution plate 40. The ventilation holes 401 are used for air flow between the first air duct 20 and the smoke chamber 10 and between the second air duct 30 and the smoke chamber 10. The first circulating fan 50 is installed on the side wall of the drying oven and near the bottom of the drying oven. The first circulating fan 50 is connected to the first air duct 20. The second circulating fan 60 is installed on the side wall of the drying oven and near the top of the drying oven. The second circulating fan 60 is connected to the second air duct 30. Heating system 70 is located outside the drying room and is used to provide heat to the inside of the drying room.
[0023] Specifically, the perforated plate 40 has a thickness of 1.2mm and can be made of galvanized steel plate, aluminum alloy plate, or a plate made of high-temperature resistant composite material. The perforation rate of the perforated plate 40 is 30%~50%. The ventilation holes 401 on it can be circular holes, elongated holes, or diamond-shaped holes with a length range of 6~10mm. The distance between the centers of every two adjacent ventilation holes 401 is 10~14mm. In the present invention, the ventilation hole 401 is a circular hole with a diameter of 8mm. The distance between the centers of every two adjacent ventilation holes 401 is 12mm. The calculated perforation rate is 35%.
[0024] Heat is provided by the heating system 70 and combined with air. At the same time, the first circulating fan 50 and the second circulating fan 60 operate synchronously. The hot air enters one of the first air duct 20 or the second air duct 30 through one of the first circulating fan 50 or the second circulating fan 60, and enters the tobacco loading chamber 10 evenly through the air distribution plate 40 to bake the tobacco leaves. Finally, it enters the other of the first air duct 20 or the second air duct 30 and is discharged through the other of the first circulating fan 50 or the second circulating fan 60.
[0025] During this process, according to the principles of fluid mechanics, when the airflow passes through a plate with a porous structure, a stable pressure drop is formed before and after the plate due to the local resistance of the holes. Under the action of this pressure equalization chamber, the airflow will flow out evenly from each small hole, thereby transforming the "point" or "area" source jet from the fan into a "volume" source uniform flow covering the entire cross-section of the tobacco loading chamber 10. Through the setting of the top and bottom air equalization perforated plates 40, it is ensured that the airflow entering the tobacco loading chamber 10 is uniform, completely eliminating dead zones and uneven areas of airflow, so that the hot air and humidity regulation of the tobacco leaves are completely consistent, resulting in a high degree of uniformity in quality.
[0026] like Figure 2As shown, a first ventilation opening (not shown in the figure) and a second ventilation opening (not shown in the figure) are respectively set near the bottom and top of the side wall of the drying oven. The first ventilation opening is connected to the first air duct, and the second ventilation opening is connected to the second air duct. A first circulating fan 50 is set at the first ventilation opening, and a second circulating fan 60 is set at the second ventilation opening. The operation of the first circulating fan 50 and the second circulating fan 60 realizes the circulating airflow of one exhausting air and the other intakeing air.
[0027] The first circulating fan 50 and the second circulating fan 60 are mixed-flow fans, and both can operate in both forward and reverse directions. This solution is also equipped with a PLC controller, which is connected to the first circulating fan 50 and the second circulating fan 60 respectively. It can simultaneously control the first circulating fan 50 and the second circulating fan 60 to operate in synchronous forward and reverse alternating directions, such as setting a cycle of "forward rotation for 40 minutes, reverse rotation for 40 minutes" for cyclical operation. When the first circulating fan 50 and the second circulating fan 60 are controlled to rotate synchronously, the first circulating fan 50 presses the air against the air distribution plate 40 at the bottom, forming a uniform upward airflow that passes through the tobacco layer in the smoke chamber 10. Finally, the second circulating fan 60 draws the airflow out evenly through the air distribution plate 40 at the top. Similarly, when the first circulating fan 50 and the second circulating fan 60 rotate synchronously, the airflow comes from top to bottom, enters through the second circulating fan 60, and the airflow passes evenly through the tobacco layer in the smoke chamber 10 and is drawn out by the first circulating fan 50.
[0028] This setup, through dynamic control of the forward and reverse rotation of the first circulating fan 50 and the second circulating fan 60, and their coordination with the air distribution perforation plate 40, ensures that the airflow periodically changes direction during the tobacco curing process. Each time the airflow changes direction, it must pass through the air distribution perforation plate 40, thus being "combed" into a uniform and stable laminar flow that penetrates the entire tobacco loading chamber 10. This design ensures that the wind speed and temperature at any horizontal section within the curing barn are highly consistent at any time, allowing the vertical temperature difference within the curing barn to be stably controlled within ±1℃, achieving the uniformity level of industrial-grade drying equipment. This enables uniform curing in three-dimensional space, ensuring that all tobacco leaves complete conversion and drying simultaneously under optimal process conditions. While improving quality, the efficient and uniform utilization of heat avoids energy waste in any area, maximizing energy savings and achieving true low-carbon curing. The overall energy saving rate can be increased by 20% to 30% compared to traditional curing barns.
[0029] Furthermore, in order to accurately control the temperature and humidity environment inside the smoke loading chamber 10, this solution configures multiple temperature and humidity sensors 80 at intervals inside the smoke loading chamber 10. The sensor layout adopts a bidirectional spacing design of "vertical + horizontal" to ensure that it evenly covers the top, middle, bottom and different horizontal areas inside the smoke loading chamber 10. It can synchronously and in real time collect temperature and humidity data of each space inside the smoke loading chamber 10, avoiding blind spots in local areas.
[0030] The back-end system can receive and display temperature and humidity data transmitted by each sensor in real time. Operators can not only intuitively grasp the temperature and humidity distribution of the entire smoke loading chamber 10, but also conveniently record historical data. At the same time, based on the real-time monitored temperature and humidity differences or anomalies, the relevant equipment can be adjusted in a timely manner to ensure that the internal environment of the smoke loading chamber 10 is always in a stable state that meets the process requirements.
[0031] Furthermore, such as Figure 2 A dehumidification window 90 is installed on the side wall of the curing barn. The dehumidification window 90 is located near the top of the curing barn and is located on both sides of the second circulating fan 60. It quickly exhausts the high humidity air in the curing barn to the outside, avoids the problem of local humidity exceeding the standard caused by the high humidity air lingering at the top, and ensures the uniformity of tobacco curing quality.
[0032] In summary, this invention utilizes the coordinated forward and reverse operation of the first circulating fan 50 and the second circulating fan 60, combined with the air distribution perforated plates 40 at the top and bottom of the tobacco loading chamber 10, to construct an "dynamic reversal + static air distribution" operation mode. This mode ensures that the wind speed and temperature at any horizontal section within the curing chamber are highly uniform at any time, completely eliminating dead zones and uneven areas of airflow. This ensures that the hot air and humidity conditions encountered by the tobacco leaves at all locations within the tobacco loading chamber 10 are completely consistent, thereby achieving a high degree of uniformity in the quality of the cured tobacco leaves. At the same time, this invention can efficiently utilize heat, save energy to the greatest extent, and achieve low-carbon curing. Its overall structure is simple to install and inexpensive, not only easy to install and maintain, but also has a long service life in high-temperature and high-humidity curing environments.
[0033] The above description is merely a preferred embodiment of this application. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.
Claims
1. A low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct, characterized in that, include: A tobacco loading chamber is located inside the curing barn. A first air duct is provided between the bottom of the tobacco loading chamber and the bottom of the curing barn, and a second air duct is provided between the top of the tobacco loading chamber and the top of the curing barn. A uniform air distribution plate is horizontally disposed at the bottom and top of the smoke loading chamber, and its planar area is equal to the cross-sectional area of the smoke loading chamber. Multiple ventilation holes are uniformly disposed on the uniform air distribution plate. The ventilation holes are used for air flow between the first air duct and the smoke loading chamber and between the second air duct and the smoke loading chamber. The first circulating fan is installed on the side wall of the drying oven and near the bottom of the drying oven. The first circulating fan is connected to the first air duct. The second circulating fan is installed on the side wall of the drying oven and near the top of the drying oven. The second circulating fan is connected to the second air duct. The heating system is located outside the drying room and is used to provide heat to the inside of the drying room.
2. The low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, The perforation rate of the air distribution plate is 30%~50%.
3. The low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, The ventilation holes are circular, elongated, or diamond-shaped.
4. The low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, The length of the ventilation hole ranges from 6 to 10 mm.
5. The low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, The distance between the centers of two adjacent ventilation holes is 10~14mm.
6. The low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, The air distribution perforated plate comprises a 1.2mm thick galvanized steel plate or aluminum alloy plate.
7. The low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, Multiple temperature and humidity sensors are installed at intervals in the smoke loading chamber.
8. A low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, A dehumidification window is provided on the side wall of the drying room. The dehumidification window is located near the top of the drying room and is located on both sides of the second circulating fan.
9. A low-carbon drying oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, The first circulating fan and the second circulating fan are used to rotate forward and reverse synchronously. When rotating forward, the first circulating fan is used to intake air and the second circulating fan is used to exhaust air.
10. A low-carbon baking oven with a perforated plate uniform flow type forward and reverse reversing circulating air duct according to claim 1, characterized in that, The first circulating fan and the second circulating fan are mixed-flow fans.