Air duct uniform air structure of plastic spray hot air circulation drying oven
By introducing components such as return air ducts, exhaust fans, air supply pipes, V-shaped rectifiers, and inclined plates into the hot air circulating drying chamber, and combining them with intelligent adjustment by sensors and controllers, the problem of poor airflow uniformity in the air duct structure has been solved, achieving uniform airflow distribution within the drying chamber and improving the drying quality and coating effect of plastic products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PUYANG MEIDE SPRAYING CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-14
AI Technical Summary
The existing hot air circulating drying box has poor air distribution, resulting in large differences in temperature and air velocity in different areas of the drying box, which affects the drying uniformity and coating quality of plastic products.
A duct structure for a plastic spraying hot air circulating drying box was designed, including components such as a return air duct, an exhaust fan, an air supply pipe, a filter, a V-shaped rectifier plate, and an inclined plate. Through the conical hole design of the inclined plate and the opening design of the V-shaped rectifier plate, combined with the intelligent adjustment of sensors and controllers, the initial homogenization and precise control of hot air are achieved, ensuring that the airflow is evenly distributed in the drying chamber.
It improves the uniformity of airflow within the drying chamber, avoids excessively strong or weak local airflow, enhances the drying quality and coating effect of plastic products, and reduces the incidence of product defects.
Smart Images
Figure CN224486601U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of plastic spraying and drying equipment, specifically to the air duct uniform structure of a plastic spraying hot air circulating drying box. Background Technology
[0002] In plastic spraying processes, sprayed plastic products need to be dried promptly to ensure coating quality. Hot air circulating drying ovens are widely used due to their efficient and uniform drying characteristics. However, existing hot air circulating drying ovens suffer from poor airflow uniformity in their duct structure, leading to significant differences in temperature and airflow velocity in different areas within the drying oven. This results in uneven drying of plastic products, affecting spraying quality and potentially causing coating defects such as blistering and cracking in some products, reducing product yield and increasing production costs.
[0003] Therefore, it is particularly important to design a uniform airflow structure for the hot air circulation drying oven for plastic spraying to overcome the above-mentioned technical defects and improve its overall practicality. Utility Model Content
[0004] The purpose of this invention is to provide an air duct uniform structure for a plastic spraying hot air circulating drying oven, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] The air distribution structure of the hot air circulating drying oven for plastic spraying includes a box body, an internal drying chamber, a roller rack inside the drying chamber, a fixed plate on one side of the drying chamber, several V-shaped rectifier plates on one side of the fixed plate, several inclined plates on one side of the V-shaped rectifier plates, a circulation chamber outside the drying chamber, a finned heater near the middle section of the circulation chamber, a blower at the beginning section of the circulation chamber, an air inlet on the side wall of the box body away from the fixed plate, an arc-shaped guide plate at the air inlet, several ventilation holes on the side wall of the drying chamber away from the fixed plate, a return air trough at the bottom of the box body, an induced draft fan outside the box body, one end of the air inlet connected to an air supply pipe, one end of the air supply pipe equipped with a first filter, the output port of the induced draft fan connected to an output pipe, and the output pipe connected to a second filter.
[0007] As a preferred embodiment of this utility model, the inclined plates are arranged in three groups, and each of the three groups of inclined plates is provided with a conical hole. The openings of the three groups of conical holes from top to bottom are 8mm, 10mm, and 12mm, respectively. The inclined plates are made of stainless steel, and the spacing between the three groups of inclined plates is 200mm. The smaller diameter end of the conical hole of the inclined plate faces the flow cavity, and the larger diameter end faces the drying cavity.
[0008] As a preferred embodiment of this utility model, several V-shaped rectifier plates have fold angles of 120° and the V-shaped openings face the inclined plate. The lower half of the leeward side of the V-shaped rectifier plate is provided with an opening, and the opening is 5mm.
[0009] As a preferred embodiment of this utility model, the central area of the fixing plate is provided with a plurality of first circular holes, and the fixing plate is provided with a plurality of second circular holes along its perimeter edge. The opening of the first circular holes is 10mm and the opening rate is 40%, the opening of the second circular holes is 12mm and the opening rate is 60%, and the fixing plate is made of stainless steel.
[0010] As a preferred embodiment of this utility model, the induced draft fan is connected to the outlet of the return air duct via a flange, and the outer casing of the induced draft fan is provided with a cooling water jacket, and the return air duct has a sawtooth structure.
[0011] As a preferred embodiment of this utility model, a controller is provided on the outside of the housing, and a temperature sensor, a humidity sensor, and a wind speed sensor are provided inside the drying chamber. The temperature sensor, humidity sensor, and wind speed sensor are respectively connected to the controller. The controller is also connected to a blower, an induced draft fan, and a finned heater, and is used to adjust the speed of the blower and induced draft fan and the power of the finned heater in real time according to the signals fed back by the sensors.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] 1. In this utility model, the air distribution structure of the plastic spray hot air circulating drying box utilizes a return air duct, induced draft fan, air supply pipe, filter, output pipe, fixed plate, V-shaped rectifier plate, and inclined plate. When the hot air passes through the inclined plate, the small-diameter orifice near the flow chamber is pressurized, allowing the hot air to enter the subsequent structure at high speed and low flow rate. The large-diameter orifice near the drying chamber reduces pressure and increases flow, initially uniformizing the hot air and avoiding uneven airflow. Then, the hot air is further rectified and guided by the V-shaped rectifier plate, with openings in the lower half of its leeward side allowing some hot air to directly enter the drying chamber and mix with the adjusted hot air, thus improving airflow uniformity. To improve airflow uniformity, hot air passes through a fixed plate. The first circular hole in the central area and the second circular hole in the edge area are combined with different opening degrees and opening ratios to precisely control the distribution of hot air flow as needed, avoiding excessive airflow in the center and ensuring uniform airflow within the drying chamber. The hot air, after being adjusted by the above structure, enters the drying chamber evenly to dry the plastic spray-coated parts on the roller rack. This solves the problem of poor airflow uniformity in the existing hot air circulating drying box duct structure, which leads to large differences in temperature and wind speed in different areas of the drying box, resulting in uneven drying of plastic products and affecting the spray coating quality. Attached Figure Description
[0014] Figure 1 This is a structural diagram of the overall plan of this utility model;
[0015] Figure 2 This is a schematic diagram of the wind distribution component structure of this utility model;
[0016] Figure 3 This is a structural schematic diagram of the overall wind direction trend of this utility model.
[0017] In the diagram: 1. Box body; 101. Drying chamber; 102. Roller rack; 103. Flow chamber; 104. Finned heater; 105. Blower; 106. Air inlet; 107. Arc-shaped guide plate; 108. Vent hole; 109. Return air duct; 110. Exhaust fan; 111. Air supply pipe; 112. First filter; 113. Output pipe; 114. Second filter; 2. Fixing plate; 203. V-shaped rectifier plate; 204. Inclined plate. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0019] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are provided. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.
[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0022] For examples, please refer to Figure 1-3 This utility model provides a technical solution:
[0023] The air distribution structure of the hot air circulating drying oven for plastic spraying includes a box body 1. Inside the box body 1 is a drying chamber 101. Inside the drying chamber 101 is a roller-type shelf 102. A fixed plate 2 is located on one side of the drying chamber 101. Several V-shaped rectifier plates 203 are located on one side of the fixed plate 2. Several inclined plates 204 are located on one side of the V-shaped rectifier plates 203. A flow chamber 103 is located outside the drying chamber 101. A finned heater 104 is located near the middle section of the flow chamber 103. A blower 105 is located at the beginning section of the flow chamber 103. An air inlet 106 is located on the side wall of the box body 1 away from the fixed plate 2. An arc-shaped guide plate 107 is located at the outlet of the air inlet 106. The drying chamber 101... A number of ventilation holes 108 are provided on the side wall away from the fixed plate 2. A return air duct 109 is provided at the bottom of the box body 1. An exhaust fan 110 is provided on the outside of the box body 1. One end of the air inlet 106 is connected to the air supply pipe 111. One end of the air supply pipe 111 is provided with a first filter 112. The output port of the exhaust fan 110 is connected to the output pipe 113. The output pipe 113 is connected to the second filter 114. Each of the three sets of inclined plates 204 is provided with a conical hole. The openings of the conical holes from top to bottom are 8mm, 10mm, and 12mm, respectively. When hot air passes through these conical holes, the small-diameter conical holes near the flow chamber 103 increase the hot air pressure, so that the hot air enters the subsequent structure at a higher speed and a smaller flow rate, close to the drying area. The large-diameter conical orifice 12mm in cavity 101 reduces hot air pressure and increases flow rate, ensuring that the hot air is initially evenly distributed before entering the drying cavity 101, avoiding excessively strong or weak local airflow. The three sets of inclined plates 204 are spaced 200mm apart, providing ample space for hot air flow and optimizing airflow organization. Next, the hot air passes through the V-shaped rectifier plate 203, which further rectifies and guides the hot air after adjustment by the inclined plates 204, making the hot air distribution more even. Simultaneously, the lower half of the leeward side of the V-shaped rectifier plate 203 has openings with an opening degree of 5mm, allowing some hot air to directly enter the drying cavity 101 through these openings, combining with the air after adjustment by the inclined plates 204. The hot air complements and mixes with each other, further improving the airflow uniformity in the drying chamber 101. Then, the hot air passes through the fixed plate 2. The central area of the fixed plate 2 is provided with several first round holes and second round holes. The combination design of different opening degrees and opening ratios precisely controls the flow rate and distribution of hot air according to the airflow requirements of different positions in the drying chamber 101. The first round hole 201 in the central area restricts the flow rate of hot air to avoid excessive airflow in the central area, while the second round hole 202 in the edge area increases the flow rate of hot air to ensure uniform airflow distribution in the drying chamber 101. After the above structural adjustment, the hot air enters the drying chamber 101 evenly to dry the plastic sprayed parts on the roller rack 102 in the drying chamber 101.
[0024] Three sets of inclined plates 204 are provided, and each set of inclined plates 204 has a conical hole. The openings of the three sets of conical holes from top to bottom are 8mm, 10mm, and 12mm, respectively. The inclined plates 204 are made of stainless steel. The spacing between the three sets of inclined plates 204 is 200mm. The smaller diameter end of the conical hole of the inclined plate 204 faces the flow chamber 103, and the larger diameter end faces the drying chamber 101. When the hot air passes through these conical holes, its flow rate and flow volume are finely regulated. The small-diameter conical orifice near the flow chamber increases the hot air pressure, allowing the hot air to enter the subsequent structure at a higher speed and lower flow rate. The large-diameter conical orifice near the drying chamber reduces the hot air pressure and increases the flow rate, ensuring that the hot air is initially evenly distributed before entering the drying chamber, avoiding excessively strong or weak local airflow. Several V-shaped rectifiers 203 have angles of 120°, with the V-shaped openings facing the inclined plate 204. The lower half of the leeward side of the V-shaped rectifier 203 has an opening with a 5mm opening, further rectifying and guiding the hot air after adjustment by the inclined plate, making the hot air distribution more even. The 5mm opening in the lower half of the airflow surface allows some hot air to directly enter the drying chamber, where it complements and mixes with the hot air adjusted by the inclined plate, further improving the airflow uniformity within the drying chamber. The central area of the fixed plate 2 has several first circular holes, and the fixed plate 2 has several second circular holes along its perimeter. The first circular holes 201 have an opening of 10mm (40% opening rate), and the second circular holes 202 have an opening of 12mm (60% opening rate). The fixed plate 2 is made of stainless steel. This combination of different opening sizes and opening rates allows for precise control of airflow according to the airflow requirements at different locations within the drying chamber. The flow rate and distribution of the heating air are controlled: the flow rate in the central area is limited to prevent excessive airflow; the flow rate at the edges is increased to ensure uniform airflow distribution within the drying chamber. The induced draft fan 110 is connected to the outlet of the return air duct 109 via a flange, and the fan 110 casing is equipped with a cooling water jacket. The return air duct 109 has a serrated structure. The cooling water jacket on the fan casing can promptly remove the heat generated during operation, reducing the fan temperature and preventing damage from overheating. A controller is located outside the housing 1, and temperature sensors, humidity sensors, and air intake sensors are installed inside the drying chamber 101. Speed sensors, temperature sensors, humidity sensors, and wind speed sensors are connected to the controller. The controller is also connected to the blower 105, the induced draft fan 110, and the finned heater 104. The controller adjusts the speed of the blower 105 and the induced draft fan 110 and the power of the finned heater 104 in real time based on the signals fed back by the sensors. According to these feedback signals, the controller can adjust the power of the blower, the induced draft fan, and the finned heater in real time to achieve intelligent control of the drying process, ensure that the environmental parameters in the drying chamber are always kept within the optimal range, and improve the drying quality and efficiency.
[0025] The working process of this utility model is as follows: When using the air duct uniform structure of the plastic spraying hot air circulating drying box, the blower 105 is first started to introduce external air through the air supply pipe 111. When the air enters the system, it first passes through the first filter 112 for preliminary filtration to remove dust, impurities, etc., to ensure the cleanliness of the air entering the drying system. Then, the clean air is sent into the circulation chamber 103. Near the middle section of the circulation chamber 103, the air is heated by the finned heater 104 and converted into hot air. The hot air first reaches the area of the inclined plate 204. The inclined plate 204 is provided with three sets, and each of the three sets of inclined plates 204 is provided with a conical hole. The opening of the conical hole from top to bottom is 8mm, 10mm, and 12mm, respectively. When the hot air passes through these conical holes, it approaches the circulation chamber. The small-diameter conical orifice of cavity 103 increases the hot air pressure, allowing the hot air to enter the subsequent structure at a higher speed and a smaller flow rate. The large-diameter conical orifice (12mm) near the drying cavity 101 reduces the hot air pressure and increases the flow rate, ensuring that the hot air is initially evenly distributed before entering the drying cavity 101, avoiding excessively strong or weak local airflow. The three sets of inclined plates 204 are spaced 200mm apart, providing ample space for hot air flow and optimizing airflow organization. Next, the hot air passes through the V-shaped rectifier plate 203, which further rectifies and guides the hot air after adjustment by the inclined plates 204, making the hot air distribution more even. Simultaneously, the lower half of the leeward side of the V-shaped rectifier plate 203 has openings with an opening size of 5mm, allowing some hot air to pass directly through these openings. The hot air enters the drying chamber 101 and mixes with the hot air adjusted by the inclined plate 204, further improving the airflow uniformity within the drying chamber 101. Then, the hot air passes through the fixed plate 2, whose central area has several first and second circular holes. The combination design of different opening degrees and opening ratios precisely controls the flow rate and distribution of the hot air according to the airflow requirements at different locations within the drying chamber 101. The first circular holes 201 in the central area limit the hot air flow to prevent excessive airflow in the central region, while the second circular holes 202 in the edge areas increase the hot air flow, ensuring uniform airflow distribution within the drying chamber 101. The hot air, after the above structural adjustments, enters the drying chamber 101 uniformly to dry the plastic spray-painted parts on the roller rack 102 within the drying chamber 101. The hot air is collected through vents and then through a sawtooth-shaped return air duct 109, which also turbulent the airflow, making it more evenly distributed within the duct. The hot air is then drawn out by the induced draft fan 110, whose casing is equipped with a cooling water jacket to remove heat generated during operation, reducing its temperature and preventing damage from overheating. The hot air is then sent out through the output pipe 113 connected to the fan's output port, filtered by the second filter 114, and re-enters the circulation system, achieving hot air recycling. Simultaneously, the drying chamber 101 is equipped with a temperature sensor, a humidity sensor, and a wind speed sensor, which are connected to a controller outside the housing 1.The controller is also connected to the blower 105, the induced draft fan 110, and the finned heater 104. Temperature, humidity, and wind speed sensors monitor the environmental parameters inside the drying chamber 101 in real time and feed the signals back to the controller. Based on these feedback signals, the controller adjusts the speed of the blower 105 and the induced draft fan 110, as well as the power of the finned heater 104, in real time to achieve intelligent control of the drying process. This ensures that the environmental parameters inside the drying chamber 101 are always kept within the optimal range, improving drying quality and efficiency.
[0026] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is through a controller. The control circuit of the controller can be realized by a person skilled in the art through simple circuit connection. It is common knowledge in the field. Therefore, this application will not explain the control method and circuit connection in detail.
[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A duct air distribution structure for a plastic spraying hot air circulating drying oven, comprising a box body (1), characterized in that: The box (1) has a drying chamber (101) inside, and a roller rack (102) inside the drying chamber (101). A fixed plate (2) is provided on one side of the drying chamber (101), and several V-shaped rectifiers (203) are provided on one side of the fixed plate (2). Several inclined plates (204) are provided on one side of the V-shaped rectifiers (203). A flow chamber (103) is provided outside the drying chamber (101). A finned heater (104) is provided near the middle section of the flow chamber (103). A blower (105) is provided at the beginning section of the flow chamber (103). The box (1) is far from the fixed plate (2). The drying chamber (101) has an air inlet (106) on one side wall, and an arc-shaped guide plate (107) is provided at the air inlet (106). The drying chamber (101) has several ventilation holes (108) on the side wall away from the fixed plate (2). The bottom of the chamber (1) has a return air trough (109). The outside of the chamber (1) is provided with an exhaust fan (110). One end of the air inlet (106) is connected to an air supply pipe (111). One end of the air supply pipe (111) is provided with a first filter (112). The output port of the exhaust fan (110) is connected to an output pipe (113). The output pipe (113) is connected to a second filter (114).
2. The air duct uniform structure of the plastic spraying hot air circulating drying oven according to claim 1, characterized in that: The inclined plates (204) are arranged in three groups, and the three groups of inclined plates (204) are provided with conical holes. The openings of the three groups of conical holes from top to bottom are 8mm, 10mm and 12mm respectively. The inclined plates (204) are made of stainless steel. The spacing between the three groups of inclined plates (204) is 200mm. The small diameter end of the conical hole of the inclined plate (204) faces the flow cavity (103) and the large diameter end faces the drying cavity (101).
3. The air duct uniform structure of the plastic spraying hot air circulating drying oven according to claim 1, characterized in that: Several V-shaped rectifier plates (203) have fold angles of 120° and the V-shaped openings face the inclined plate (204). The lower half of the leeward side of the V-shaped rectifier plate (203) is provided with an opening with an opening size of 5mm.
4. The air duct uniform structure of the plastic spraying hot air circulating drying oven according to claim 1, characterized in that: The fixing plate (2) has a number of first circular holes in its central area and a number of second circular holes along its perimeter. The opening of the first circular hole (201) is 10 mm and the opening rate is 40%. The opening of the second circular hole (202) is 12 mm and the opening rate is 60%. The fixing plate (2) is made of stainless steel.
5. The air duct uniform structure of the plastic spraying hot air circulating drying oven according to claim 1, characterized in that: The induced draft fan (110) is connected to the outlet of the return air duct (109) via a flange, and the outer casing of the induced draft fan (110) is provided with a cooling water jacket, and the return air duct (109) has a sawtooth structure.
6. The air duct uniform structure of the plastic spraying hot air circulating drying oven according to claim 1, characterized in that: The outer side of the housing (1) is equipped with a controller, and the drying chamber (101) is equipped with a temperature sensor, a humidity sensor, and a wind speed sensor. The temperature sensor, humidity sensor, and wind speed sensor are respectively connected to the controller. The controller is also connected to a blower (105), an induced draft fan (110), and a finned heater (104). The controller is used to adjust the speed of the blower (105) and the induced draft fan (110) and the power of the finned heater (104) in real time according to the signals fed back by the sensors.