Multi-stage hot air circulating air distribution device

Abstract

The utility model relates to drying equipment technical field, concretely relates to a kind of multi-section hot air circulation air distribution device;The design is realized by the air distribution structure design of multiple independent, the accurate regulation and control of wind speed, wind direction, temperature in different areas of drying cavity, ensure that material can contact even hot air in each drying stage, reduce the drying deviation of same batch material;Second, by multi-section linkage control mechanism, each air distribution section can dynamically adjust hot air flow rate, temperature and cycle frequency according to material drying progress, avoid "over drying" or "insufficient drying";At the same time, by the air return and heat exchange design of multiple independent, realize the staged recovery of each area waste gas;In addition, by adjustable multi-section air distribution assembly, avoid material winding, stacking or displacement;Finally, by integrating the sensing detection module of each section hot air state and material moisture content, realize the automatic adaptation of air distribution parameter in combination with intelligent control system.

Description

Technical Field

[0001] This utility model relates to the field of drying equipment technology, and in particular to a multi-stage hot air circulation distribution device. Background Technology

[0002] In the field of drying equipment, hot air circulation technology has become the mainstream design concept due to its ability to improve heat utilization and reduce energy consumption. Existing hot air distribution devices mainly have the following advantages: Single-stage air distribution: Only one air distribution structure is set in the drying chamber, and the hot air flows as a whole in the chamber. It is suitable for scenarios with low requirements for drying uniformity and can meet basic drying needs to a certain extent, enabling materials to achieve preliminary drying effects. Simple segmented air distribution: Some equipment divides the drying chamber into multiple areas, with each area receiving independent air supply. Compared with single-stage air distribution, it can control the air supply to a certain extent according to different areas, and has a certain degree of targeting for the drying of materials in different areas. Traditional fluid distribution structure: Air distribution components mostly adopt simple forms such as straight pipe openings, grids, or guide plates. The structure is simple, easy to manufacture and install, and can achieve hot air distribution to a certain extent to complete the drying process.

[0003] However, the shortcomings of existing hot air distribution technology in terms of drying uniformity, segmented coordination, energy consumption control, and material adaptability have become key factors restricting product quality and production efficiency, especially in industries with high requirements for drying precision. Utility Model Content

[0004] The purpose of this utility model is to provide a multi-segment hot air circulation distribution device, which aims to solve the shortcomings of existing hot air distribution technology in terms of drying uniformity, segmented coordination, energy consumption control and material adaptability. In particular, in industries with high requirements for drying precision, this has become a key technical problem that restricts product quality and production efficiency.

[0005] To achieve the above objectives, this utility model employs a multi-segment hot air circulation and distribution device, comprising a multi-segment drying chamber and a hot air circulation assembly. The multi-segment drying chamber has multiple sub-cavities, which are connected by connecting ducts to form series and parallel channels. Each sub-cavity is equipped with an air distribution assembly, which includes an air inlet, an air distribution duct, an air outlet, and a regulating valve. The air inlet is connected to the hot air delivery duct via a flange. The air distribution duct is distributed in a tree-like pattern within the sub-cavities, and each branch of the air distribution duct is welded to the main duct. The air outlet is located at the end of the air distribution duct, the regulating valve is located on the air distribution duct, and the hot air circulation assembly includes a circulating fan, a heat exchanger, and a return air duct. The air inlet of the circulating fan is connected to the return air duct, and the air outlet of the circulating fan is connected to the air inlet of the heat exchanger. The air outlet of the heat exchanger is connected to the air inlet of each of the sub-cavities through the air inlet duct. The return air duct is led out from the air outlet of each of the sub-cavities, connected to the main return air duct through a branch duct of the air distribution duct, and connected to the air inlet of the circulating fan.

[0006] The series channel is formed by connecting the air outlet of the previous sub-cavity and the air inlet of the next sub-cavity through a connecting duct.

[0007] The parallel channel connects the air inlet and outlet of each of the sub-cavities to the main air inlet and return ducts, respectively.

[0008] Each of the sub-cavities is equipped with a temperature sensor, a humidity sensor, a wind speed sensor, and a programmable logic controller (PLC). The temperature sensor, humidity sensor, and wind speed sensor are all connected to the PLC via wires. The PLC is connected to the regulating valve, the circulating fan, and the heating power controller of the heat exchanger via wires.

[0009] Each of the sub-cavities adopts a double-layer insulation structure, with the inner layer being made of high-temperature resistant stainless steel and the outer layer being made of thermal insulation material.

[0010] This utility model discloses a multi-segment hot air circulation distribution device. This design utilizes a multi-segment independent air distribution structure to achieve precise control of air velocity, direction, and temperature in different areas of the drying chamber. This ensures that the material receives uniform hot air at each drying stage, reducing drying deviations within the same batch and improving product quality stability. Secondly, through a multi-segment linkage control mechanism, each air distribution segment can dynamically adjust the hot air velocity, temperature, and circulation frequency according to the material drying progress, avoiding "over-drying" or "under-drying," improving drying efficiency, and shortening the production cycle. Simultaneously, through a multi-segment independent return air and heat exchange design, it achieves graded recovery of waste gas from each area (e.g., waste gas from high-humidity areas is dehumidified and then recirculated, while waste gas from low-humidity areas is directly reused), reducing heat loss and lowering energy consumption per unit of material. Furthermore, through... The adjustable multi-segment air distribution components (such as adjustable air outlet angle and wind speed) prevent material entanglement, stacking, or displacement, ensuring that materials of different forms remain dispersed throughout the drying process and guaranteeing sufficient heat exchange. Finally, by integrating sensors that detect the hot air status (temperature, humidity, wind speed) of each segment with the material moisture content, and combining this with an intelligent control system, the air distribution parameters are automatically adapted, reducing manual intervention and improving the automation level and production stability of the equipment. The core purpose of this design is to systematically solve the technical problems of poor drying uniformity, high energy consumption, low efficiency, weak material adaptability, and insufficient intelligent control in existing technologies through multi-segment independent control, precise air distribution, efficient circulation, and intelligent adaptation, thereby meeting the requirements of high-precision drying scenarios for product quality, production efficiency, and energy saving. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of the multi-segment hot air circulation and distribution device of this utility model.

[0013] Figure 2 This is a partial structural diagram of the multi-segment hot air circulation and distribution device of this utility model.

[0014] 1-Multi-section drying chamber, 2-Regulating valve, 3-Sub-chamber, 4-Air distribution duct, 5-Air outlet, 6-Air inlet. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0016] Please see Figures 1 to 2 This utility model provides a multi-segment hot air circulation and distribution device, including a multi-segment drying chamber 1 and a hot air circulation assembly. The multi-segment drying chamber 1 has multiple sub-cavities 3, which are connected by connecting air ducts to form series and parallel channels. Each sub-cavity 3 is equipped with an air distribution assembly, which includes an air inlet 6, an air distribution pipe 4, an air outlet 5, and a regulating valve 2. The air inlet 6 is connected to the hot air delivery pipe via a flange. The air distribution pipe 4 is distributed in a tree-like pattern within the sub-cavities 3, and each branch pipe of the air distribution pipe 4 is connected to the main pipe by welding. An air outlet 5 is located at the end of the air distribution duct 4, and a regulating valve 2 is located on the air distribution duct 4. The hot air circulation assembly includes a circulating fan, a heat exchanger, and a return air duct. The air inlet 6 of the circulating fan is connected to the return air duct, and the air outlet 5 of the circulating fan is connected to the air inlet of the heat exchanger. The air outlet of the heat exchanger is connected to the air inlet 6 of each of the sub-cavities 3 through the air inlet duct. The return air duct is led out from the air outlet 5 of each of the sub-cavities 3, connected to the main return air duct through a branch duct of the air distribution duct 4, and connected to the air inlet 6 of the circulating fan.

[0017] In this embodiment, the multi-stage drying chamber 1 consists of multiple independent sub-chambers 3 connected by specific air ducts. Each sub-chamber 3 can independently control parameters such as temperature and air velocity according to the material drying requirements. For example, for materials with high initial moisture content, the first sub-chamber 3 can be set with a higher temperature (60-80℃) and a larger air velocity (3-5m / s) to achieve rapid dehydration. In the later shaping stage, the subsequent sub-chambers 3 can reduce the temperature (40-50℃) and reduce the air velocity (1-2m / s).

[0018] In this embodiment, an independent air distribution assembly is provided: each sub-cavity 3 is equipped with an independent air distribution assembly, including an air inlet 6, an air distribution duct 4, an air outlet 5, and a regulating valve 2; the air inlet 6 is connected to the hot air delivery duct, and the air distribution duct 4 adopts a branched design to ensure that the hot air can be evenly distributed to all areas within the sub-cavity 3; the air outlet 5 is designed in various forms, such as a grille type or a perforated plate type, and the appropriate air outlet 5 form is selected according to the material shape to optimize the contact effect between the hot air and the material. The regulating valve 2 can manually or automatically adjust the air intake volume and wind speed to achieve precise control.

[0019] In this embodiment, the hot air circulation assembly consists of a circulating fan, a heat exchanger, and a return air duct. The circulating fan is installed on the return air duct to extract the hot air from the sub-cavity 3 and send it to the heat exchanger for heating or cooling (depending on drying requirements), and then sends it back to the sub-cavity 3 for recycling through the inlet air duct. The heat exchanger adopts a high-efficiency finned structure to increase the heat exchange area and improve the heat exchange efficiency. The return air duct has multiple branches, which are connected to the air outlets 5 of each sub-cavity 3 to realize the centralized recovery and circulation of hot air in multiple stages.

[0020] Furthermore, the series channel is formed by connecting the air outlet 5 of the previous sub-cavity 3 and the air inlet 6 of the next sub-cavity 3 through a connecting duct.

[0021] Furthermore, the parallel channel is such that the air inlet 6 and air outlet 5 of each of the sub-cavities 3 are respectively connected to the main air inlet pipe and the return air pipe.

[0022] Furthermore, each of the sub-cavities 3 is equipped with a temperature sensor, a humidity sensor, a wind speed sensor, and a programmable logic controller. The temperature sensor, the humidity sensor, and the wind speed sensor are all connected to the programmable logic controller via wires. The programmable logic controller is connected to the regulating valve 2, the circulating fan, and the heating power controller of the heat exchanger via wires.

[0023] In this embodiment, the intelligent control system includes a temperature sensor, a humidity sensor, a wind speed sensor, and a programmable logic controller (PLC). The various sensors are distributed in each sub-cavity 3 to monitor parameters such as hot air temperature, material humidity, and wind speed in real time, and transmit the data to the PLC. Based on the preset drying curve and real-time monitoring data, the PLC automatically adjusts the valve opening of the air distribution components, the speed of the circulating fan, and the heating power of the heat exchanger in each sub-cavity 3 to achieve intelligent control of the drying process.

[0024] Furthermore, each of the sub-cavities 3 adopts a double-layer insulation structure, with the inner layer being made of high-temperature resistant stainless steel and the outer layer being made of thermal insulation material.

[0025] In this utility model, compared with the prior art, this design can achieve multi-dimensional performance improvement through structural innovation and technical optimization. Its beneficial effects are mainly reflected in the following aspects:

[0026] 1. Significantly improves drying uniformity and ensures material quality stability:

[0027] Compared with existing single-section or simple segmented air distribution devices, this device effectively solves problems such as "local dead zones" and "air velocity imbalance" by using a multi-segment independent air distribution structure (such as independent adjustment of wind speed, temperature, and wind direction in each segment) combined with a fluid dynamics-optimized air distribution path design. This ensures that the hot air distribution deviation in different areas of the drying chamber is controlled within ±5% (compared to ±10%-15% in existing technologies), and the moisture content difference of the same batch of materials is reduced to below 2%, meeting the high-precision drying requirements of food, precision materials, and other scenarios. For fibrous, sheet-like, and other easily stacked or tangled materials, the adjustable air direction and wind speed design reduces material accumulation, ensuring that each layer of material can fully contact the hot air and avoiding local over-drying or under-drying.

[0028] 2. Improve segmented coordination to enhance drying efficiency and energy utilization:

[0029] Compared to the shortcomings of existing segmented air distribution devices that are "independent and not linked," this device achieves the following advantages through multi-segment linkage control and graded circulation design: It can dynamically match the parameters of each segment according to the characteristics of the material drying stage (such as high temperature and high wind speed required for rapid dehydration in the early stage, and low temperature and low wind speed required for shaping in the later stage), thereby shortening the drying cycle by 15% to 30% (such as reducing the drying time of agricultural products from the traditional 8 hours to 56 hours); It adopts segmented return air and heat recovery technology (the exhaust gas in the high humidity segment is dehumidified and reused, and the exhaust gas in the low humidity segment is directly circulated), which improves the heat utilization rate by 20% to 30% and reduces the energy consumption per unit material by 10% to 25%, meeting the industrial requirements for energy conservation and emission reduction.

[0030] 3. Enhance material adaptability and broaden application scenarios:

[0031] Compared with the "single adaptability" of existing devices to material forms, this device achieves adaptability to various material forms such as granules, powders, fibers, and flakes through modular air distribution components (such as replaceable air outlet 5-grid and adjustable air supply nozzles). It can dry both grain granules and textile fibers. It avoids displacement, entanglement, or damage to materials caused by airflow impact (such as improving the integrity of Chinese herbal medicine slices to over 95%, while existing technologies are mostly around 80%).

[0032] 4. Achieve intelligent control, reducing labor costs and operational complexity:

[0033] Compared to existing devices that rely on manually preset parameters, this device integrates sensing and intelligent control systems, offering the following advantages: real-time monitoring of hot air temperature, humidity, wind speed, and material moisture content in each section, automatically adjusting the air distribution strategy, reducing manual intervention and dependence on operational experience; through data feedback and adaptive algorithms, it can automatically generate optimal drying curves for different materials, shortening the debugging time for new materials by more than 50% and improving the flexibility of the production line.

[0034] 5. Improved structural stability and ease of maintenance:

[0035] Compared to the existing devices where the air distribution components are prone to dust accumulation and difficult to clean, this device adopts a detachable segmented structure and dust-proof design: each segment of the air distribution component can be disassembled independently, which facilitates daily cleaning and maintenance and reduces air distribution deviation caused by dust accumulation; the segmented sealing design reduces hot air leakage (the leakage rate is reduced to below 3%, while existing technologies are mostly 8% to 10%), further ensuring thermal efficiency and equipment lifespan.

[0036] In summary, this device addresses the core issues of existing technologies, such as poor uniformity, low efficiency, high energy consumption, narrow applicability, and cumbersome operation. It offers significant advantages in improving product quality, reducing production costs, and expanding application scenarios, and can be widely applied to drying processes in various fields, including agricultural product processing, food manufacturing, chemical materials, and textile printing and dyeing.

[0037] The specific working principle of this utility model is as follows:

[0038] Hot air input and distribution: Hot air generated by an external hot air source enters the first sub-cavity 3 of the multi-section drying chamber 1 through the air inlet pipe; inside the first sub-cavity 3, the hot air enters the air distribution pipe 4 through the air inlet 6 of the independent air distribution component, and is evenly distributed to various areas in the sub-cavity 3 through the branch pipes, and is blown out from the air outlet 5 to exchange heat with the material and remove the moisture in the material.

[0039] Hot air circulation and multi-stage control: After heat exchange in the first sub-cavity 3, part of the hot air enters the connecting duct through the air outlet 5 and continues to participate in the drying process in the next sub-cavity 3; part of the hot air is drawn out by the circulating fan through the return air duct and sent to the heat exchanger. In the heat exchanger, the hot air is heated or cooled according to the needs of the current drying stage, and then returned to the corresponding sub-cavity 3 for recycling through the air inlet duct. The intelligent control system judges the hot air status and material dryness in each sub-cavity 3 based on real-time monitoring data from sensors. By adjusting the valve opening of the air distribution component, it controls the amount and speed of hot air entering each sub-cavity 3; adjusts the speed of the circulating fan to control the hot air circulation volume; and adjusts the heating power of the heat exchanger to control the hot air temperature, thereby achieving precise multi-stage hot air control to meet the needs of materials at different drying stages.

[0040] Material drying process: The material is conveyed in the drying chamber by conveyor belts, trays, etc., and passes through each sub-chamber 3 in sequence; in each sub-chamber 3, the material is in full contact with hot air of corresponding parameters, and the moisture is continuously evaporated and carried away. As the material moves in the multi-stage drying chamber 1, the drying process from high moisture content to low moisture content is gradually completed, and the material that finally meets the drying requirements is discharged from the outlet of the drying chamber.

[0041] This utility model also provides two embodiments, as follows:

[0042] Example 1 (Agricultural Product (Grain) Drying Scenario):

[0043] Structural components:

[0044] Drying chamber: It adopts a series multi-segment design, consisting of three sub-chambers 3. Each sub-chamber 3 is 3 meters long, 2 meters wide, and 1.5 meters high. The sub-chambers 3 are made of stainless steel with smooth inner walls to reduce material residue. The sub-chambers 3 are connected by sealed transition air ducts to ensure that hot air does not leak out.

[0045] Independent air distribution assembly: Each sub-cavity 3 has an air inlet 6 installed at the top, which is connected to the air distribution duct 4; the air distribution duct 4 has a rectangular cross section and branches in a tree-like manner within the sub-cavity 3, with a grille-type air outlet 5 at the end of each branch duct; the air outlets 5 are spaced 10 cm apart to ensure that hot air evenly covers the material; the regulating valve 2 is an electric butterfly valve, installed at the air inlet 6, which can precisely control the air intake.

[0046] Hot air circulation system: The circulating fan is a centrifugal fan with a power of 15 kilowatts, installed in the middle of the return air duct; the heat exchanger is a finned tube type, installed between the air outlet 5 of the circulating fan and the air inlet duct, which can heat or cool the hot air as needed; the return air duct is led out from the bottom of each section cavity 3, and then connected to the air inlet 6 of the circulating fan.

[0047] Intelligent control system: Temperature sensors are installed every 1 meter, evenly distributed in each sub-cavity 3; humidity sensors are installed near the air outlet 5 to monitor the humidity of the hot air; wind speed sensors are installed at the air inlet 6 and air outlet 5 to monitor the wind speed in real time. All sensor data are transmitted to the PLC controller, which controls the opening of the electric butterfly valve, the speed of the circulating fan, and the heating power of the heat exchanger according to the preset drying curve.

[0048] Working principle:

[0049] In the initial stage, the grain enters the first sub-cavity 3 via a conveyor belt. At this time, the intelligent control system controls the electric butterfly valve of the air inlet 6 of the first sub-cavity 3 to be fully opened according to the initial moisture content of the grain and the preset drying curve. The circulating fan runs at a high speed (e.g., 1200 rpm), and the heat exchanger heats the hot air to 65°C. The hot air is blown out from the grille-type air outlet 5 through the air distribution duct 4, making full contact with the grain and quickly removing moisture.

[0050] After being dried in the first sub-cavity 3, the grain enters the second sub-cavity 3. As the moisture content of the grain is reduced, the intelligent control system automatically adjusts the opening of the electric butterfly valve at the air inlet 6 of the second sub-cavity 3 to 70%, the speed of the circulating fan is reduced to 1000 rpm, and the heat exchanger adjusts the hot air temperature to 55℃. Under these temperature and wind speed conditions, the grain continues to dry, further reducing the moisture content.

[0051] Finally, the grain enters the third sub-cavity 3; at this time, the intelligent control system further reduces the opening of the electric butterfly valve at the air inlet 6 to 50%, the speed of the circulating fan drops to 800 rpm, and the heat exchanger maintains the hot air temperature at 45℃ to carry out the final drying and shaping treatment of the grain, so that the moisture content of the grain reaches the safe storage standard (such as below 13%).

[0052] Throughout the drying process, the hot air in each sub-cavity 3 exchanges heat with the grain, is then drawn out by a circulating fan through the bottom return air duct, enters a heat exchanger for temperature adjustment, and is then returned to each sub-cavity 3 for reuse. The intelligent control system dynamically adjusts the air distribution parameters and hot air temperature of each sub-cavity 3 based on real-time data monitored by sensors, ensuring that the grain is dried under optimal conditions.

[0053] effect:

[0054] It achieves precise segmented control of the grain drying process, providing the most suitable hot air conditions according to the moisture content and drying characteristics of the grain at different stages, thus avoiding over-drying or under-drying.

[0055] Multi-stage hot air circulation improves energy efficiency and reduces energy consumption; real-time monitoring and adjustment by the intelligent control system ensures the stability and reliability of the drying process and reduces the difficulty and labor intensity of manual operation.

[0056] Effect:

[0057] After being dried by this device, the moisture content difference of grains in the same batch can be controlled within 1%, significantly improving the drying quality and effectively reducing grain mold and loss caused by uneven drying.

[0058] Compared with traditional single-stage drying equipment, energy consumption is reduced by more than 20% and drying efficiency is increased by about 30%. Taking the processing of 10 tons of grain as an example, the traditional equipment requires 8 hours, while this equipment only requires about 5.6 hours, which greatly improves production efficiency.

[0059] Example 2 (Textile printing and dyeing (fabric) drying scenario):

[0060] Structural components:

[0061] Drying chamber: Adopts a parallel multi-segment design, consisting of four sub-chambers 3. Each sub-chamber 3 is 4 meters long, 1.5 meters wide, and 2 meters high. Sub-chambers 3 are made of aluminum alloy with an anti-corrosion surface treatment. The air inlet 6 and air outlet 5 of each sub-chamber 3 are connected to the main air inlet and return ducts via quick-connect fittings for easy disassembly and maintenance.

[0062] Independent air distribution assembly: Each sub-cavity 3 has an air inlet 6 installed on its inner side, which is connected to an adjustable air distribution nozzle; the air distribution nozzle is made of stainless steel and can be manually adjusted within the range of 0-90 degrees to adapt to fabrics of different thicknesses and materials; the air outlet 5 is located on the other side of the sub-cavity 3 and adopts a perforated plate structure to ensure that hot air is discharged evenly; the regulating valve 2 is a pneumatic regulating valve installed on the air inlet duct, which can quickly respond to the instructions of the intelligent control system.

[0063] Hot air circulation system: The circulating fan is an axial flow fan with a power of 10 kilowatts, installed at the front end of the return air duct; the heat exchanger is a plate heat exchanger, installed between the circulating fan and the inlet air duct, which has high-efficiency heat exchange performance; the return air duct is led out from the air outlet 5 of each sub-cavity 3, and then connected to the air inlet 6 of the circulating fan.

[0064] Intelligent control system: The temperature sensor is installed in the sub-cavity 3 near the fabric, the humidity sensor is installed at the air outlet 5, and the wind speed sensor is installed at the air inlet 6 and the air outlet 5. The sensor data is transmitted to the PLC controller in real time. The PLC controls the opening of the pneumatic regulating valve, the speed of the circulating fan, and the heating power of the heat exchanger according to the drying process requirements of the fabric and the real-time monitoring data.

[0065] Working principle:

[0066] The fabric enters each segment cavity 3 via conveyor rollers. In the first segment cavity 3, for fabrics with high moisture content after printing and dyeing, the intelligent control system controls the pneumatic regulating valve to open to 80%, the circulating fan runs at a high speed (e.g., 1500 rpm), and the heat exchanger heats the hot air to 70°C; the adjustable-angle air nozzle blows the hot air onto the fabric at a suitable angle to quickly evaporate the moisture on the fabric surface.

[0067] As the fabric enters the second section cavity 3, its moisture content decreases. The intelligent control system automatically adjusts the opening of the pneumatic regulating valve to 60%, the speed of the circulating fan is reduced to 1200 rpm, and the heat exchanger adjusts the hot air temperature to 60℃. The angle of the air nozzles is finely adjusted according to the fabric drying process to ensure that the hot air acts evenly on the fabric, further reducing the moisture content.

[0068] In the third sub-cavity 3, the intelligent control system continues to reduce the opening of the pneumatic regulating valve to 40%, the speed of the circulating fan is reduced to 1000 rpm, and the heat exchanger maintains the hot air temperature at 50°C to deeply dry the fabric and remove most of the residual moisture.

[0069] Finally, the fabric enters the fourth sub-cavity 3; at this time, the intelligent control system adjusts the pneumatic regulating valve opening to 20%, the circulating fan speed is reduced to 800 rpm, and the heat exchanger maintains the hot air temperature at 40℃ to shape and dry the fabric with residual heat, so that the fabric achieves the ideal drying effect.

[0070] After exchanging heat with the fabric, the hot air in each sub-cavity 3 enters the return air duct from the air outlet 5, is drawn out by the circulating fan, and after the temperature is adjusted by the heat exchanger, it is sent back to each sub-cavity 3 for recycling. The intelligent control system adjusts the air distribution parameters and hot air temperature of each sub-cavity 3 in real time according to sensor data to ensure that the fabric can be treated optimally at different drying stages.

[0071] effect:

[0072] In response to the diversity and special characteristics of textile printing and dyeing fabrics, the adjustable-angle air nozzles and precise segmented control meet the drying needs of different fabrics and avoid deformation or damage to the fabrics caused by hot air impact.

[0073] The multi-stage hot air circulation design improves energy utilization and reduces production costs; the application of the intelligent control system enables automated production, improving production efficiency and product quality stability.

[0074] Effect:

[0075] Fabrics dried using this device exhibit good flatness, with no obvious deformation or damage, and a drying uniformity exceeding 98%. Compared to traditional drying devices, energy consumption is reduced by 15%-20%, and production efficiency is increased by approximately 25%. For example, processing 1000 meters of fabric requires 3 hours with traditional devices, while this device only requires about 2.25 hours. Simultaneously, the product defect rate is reduced from 5% to below 1%.

[0076] As can be seen from the two embodiments above, the multi-stage hot air circulation distribution device can achieve efficient, energy-saving, and high-quality drying or baking effects in different application scenarios through its reasonable structural design and precise control principle, which has significant advantages and good application prospects.

[0077] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A multi-stage hot air circulation and distribution device, characterized in that, The device includes a multi-section drying chamber and a hot air circulation assembly. The multi-section drying chamber has multiple sub-cavities connected by connecting ducts, forming series and parallel channels. Each sub-cavity is equipped with an air distribution assembly, which includes an air inlet, air distribution ducts, an air outlet, and a regulating valve. The air inlet is connected to the hot air delivery duct via a flange. The air distribution ducts are arranged in a tree-like pattern within each sub-cavity, and each branch of the air distribution duct is welded to the main duct. The air outlet is located within the air distribution... At the end of the duct, the regulating valve is installed on the air distribution duct. The hot air circulation assembly includes a circulating fan, a heat exchanger, and a return air duct. The air inlet of the circulating fan is connected to the return air duct, and the air outlet of the circulating fan is connected to the air inlet of the heat exchanger. The air outlet of the heat exchanger is connected to the air inlet of each of the sub-cavities through the air inlet duct. The return air duct is led out from the air outlet of each of the sub-cavities, connected to the main return air duct through a branch duct of the air distribution duct, and connected to the air inlet of the circulating fan.

2. The multi-stage hot air circulation and distribution device as described in claim 1, characterized in that, The series channel is formed by connecting the air outlet of the previous sub-cavity and the air inlet of the next sub-cavity through a connecting duct.

3. The multi-stage hot air circulation and distribution device as described in claim 2, characterized in that, The parallel channel connects the air inlet and outlet of each of the sub-cavities to the main air inlet duct and return duct, respectively.

4. The multi-stage hot air circulation and distribution device as described in claim 3, characterized in that, Each of the sub-cavities is equipped with a temperature sensor, a humidity sensor, a wind speed sensor, and a programmable logic controller (PLC). The temperature sensor, humidity sensor, and wind speed sensor are all connected to the PLC via wires. The PLC is connected to the regulating valve, the circulating fan, and the heating power controller of the heat exchanger via wires.

5. The multi-stage hot air circulation and distribution device as described in claim 4, characterized in that, Each of the aforementioned sub-cavities adopts a double-layer insulation structure, with the inner layer being made of high-temperature resistant stainless steel and the outer layer being made of thermal insulation material.

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