Air inlet and return assembly of grain dryer

Abstract

The air inlet and return assembly of the grain dryer comprises a drying shell and an air return fan, a drying cavity, an air inlet cavity and an air return cavity are formed in the drying shell, the drying cavity is provided with a first air inlet and an air return opening, the drying cavity is communicated with the air return cavity through the first air inlet and communicated with the air inlet cavity through the air return opening, and the air return cavity is communicated with the air return cavity through the air return opening. The air inlet cavity and the air return cavity are communicated through a second air inlet, the air return fan is arranged at the position of the second air inlet, the air inlet cavity is provided with a third air inlet, an air guide plate is arranged in the air inlet cavity and arranged between the third air inlet and the air return inlet, hot air enters from the third air inlet, and the air return fan is arranged at the position of the air return fan. And hot air backflow of the drying cavity, the air inlet cavity and the air return cavity is formed under the action of the air guide plate and the air return fan. A hot air backflow structure is formed in the grain drying machine.

Description

Technical Field

[0001] This utility model relates to the field of grain drying equipment, and in particular to an air inlet and return assembly for a grain dryer. Background Technology

[0002] Current grain dryers generally adopt a horizontal angular box array drying shell structure. Grain is circulated from top to bottom through this shell by coordinating equipment to achieve drying. This structure has limitations in structural design and drawbacks of modular design. Due to these limitations, hot air circulation efficiency is insufficient. The horizontal angular boxes are arranged in a horizontal matrix within the drying shell, forming grain flow channels between adjacent boxes. Hot air penetrates the grain layer unidirectionally through ventilation holes / gap on the surface of the angular boxes. While this achieves basic drying functionality, the horizontal layout necessitates the extraction of the dried hot air from the drying shell and its subsequent return by other equipment. This process leads to heat loss and increased energy consumption from other equipment. Current technology does not incorporate a hot air recirculation structure within the drying shell, resulting in low waste heat utilization and increased energy consumption. Utility Model Content

[0003] The purpose of this utility model is to solve the above-mentioned technical problems and provide an air inlet and return assembly for a grain dryer, which forms a hot air return structure within the grain dryer.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] An air inlet and return assembly for a grain dryer includes a drying shell and a return air fan. The drying shell has a drying chamber, an air inlet chamber, and a return air chamber. The drying chamber has a first air inlet and a return air inlet, which communicate with the return air chamber and the air inlet chamber, respectively. The air inlet chamber and the return air chamber are connected by a second air inlet. The return air fan is located at the second air inlet. The air inlet chamber has a third air inlet. A guide plate is located inside the air inlet chamber and between the third air inlet and the return air inlet. Hot air enters through the third air inlet and, under the action of the guide plate and the return air fan, forms a hot air recirculation between the drying chamber, the air inlet chamber, and the return air chamber.

[0006] According to the air inlet and return assembly of the grain dryer of this application, after hot air enters the air inlet chamber, it is prevented from being blown directly to the return air inlet by the guide plate. The return air fan is started, and under the traction of the return air fan, the hot air flows into the drying chamber along the second air inlet and the first air inlet to dry the grain in the drying chamber. The dried hot air then flows out from the return air inlet and continues to be blown back into the drying chamber by the guide plate and the return air fan, forming a hot air return duct structure. This application directly forms a hot air return structure in the drying shell, which makes the waste heat utilization rate high, thereby reducing the energy consumption for generating hot air.

[0007] Furthermore, the drying shell includes a drying frame, an air inlet frame, and a return air frame. The drying chamber, air inlet chamber, and return air chamber are correspondingly arranged in the drying frame, air inlet frame, and return air frame, respectively. The first air inlet and the return air inlet are located on the same first side of the drying frame, with the first air inlet positioned above the return air inlet. The air inlet frame and the return air frame are fixed to the first side, with the return air frame correspondingly positioned above the air inlet frame. The drying frame has openings at the top and bottom. Grain enters through the top opening and exits through the bottom opening, circulating and drying within the drying chamber. The first air inlet and the return air inlet are both located on the first side, simplifying the design of the air inlet frame and the return air frame.

[0008] Furthermore, it also includes an air inlet hood, an upper mounting base, a lower mounting base, a mesh-type air inlet pipe, and a mesh-type air outlet pipe. The upper mounting base is fixed to the upper part of the drying chamber, the lower mounting base is fixed to the lower part of the drying chamber, the upper end of the mesh-type air inlet pipe is fixed to the upper mounting base, and the mesh-type air outlet pipe is fixed to the lower mounting base, so that the mesh-type air inlet pipe and the mesh-type air outlet pipe are vertically spaced apart in the drying chamber, and the grain is dried between the mesh-type air inlet pipe and the mesh-type air outlet pipe. The air inlet hood covers the upper mounting base, and the air inlet hood is provided with an air inlet channel, which is connected to the first air inlet. The upper mounting base is provided with a fourth air inlet, which is connected to the air inlet channel and the mesh-type air inlet pipe. The lower mounting base is provided with an air outlet channel, and the mesh-type air outlet pipe is connected to the air outlet channel, which is connected to the return air inlet. Hot air enters the grain for drying through the air inlet channel and the mesh holes on the mesh-type air inlet pipe, and exits through the mesh holes and air outlet channel on the mesh-type air outlet pipe. Finally, a portion of the hot air returns to the air inlet chamber through the return air inlet, forming a hot air recirculation structure. In other words, the hot air in this application has an upper-inlet and lower-outlet air inlet and outlet structure in the drying chamber. Compared with the side-inlet and side-outlet air inlet and outlet structure of the horizontally placed corner box, the mesh-type air inlet pipe and mesh-type air outlet pipe in this application are arranged vertically in the drying chamber. The mesh-type air inlet pipe and mesh-type air outlet pipe will not collide with the falling grain and can also be easily coordinated to form a hot air recirculation structure.

[0009] Furthermore, the drying shell is also equipped with an air outlet chamber, which in turn has an air outlet. The air outlet channel connects to the air outlet chamber through the air outlet. A portion of the hot air from the dried grain is also discharged into the air outlet chamber through the air outlet channel and the air outlet.

[0010] Furthermore, the air outlet cavity is equipped with an air outlet fan. The air outlet fan and the return air fan have the same power, and their quantity ratio is air outlet fan: return air fan = 2:3. The arrangement of the air outlet fan and the return air fan ensures that the airflow generated by the return air fan is greater than that of the air outlet fan, thereby ensuring the efficiency of hot air recirculation.

[0011] Furthermore, the drying housing also includes an air outlet frame, and the air outlet cavity is disposed in the air outlet frame.

[0012] Furthermore, the drying frame also has a second side opposite to the first side, and the air outlet is located on the second side.

[0013] Furthermore, mesh panels are also provided on the first and second sides. The mesh openings on the mesh panels can increase the ventilation effect of the drying chamber, meaning that the heat inside the drying chamber can also flow through the mesh openings on the mesh panels to the air inlet and air outlet, and the hot air entering the air inlet also participates in the hot air recirculation.

[0014] Furthermore, it also includes an air damper actuator and a temperature sensor. The temperature sensor is used to sense the drying temperature inside the drying chamber, and the air damper actuator is installed on the air inlet frame. The air damper actuator controls the opening degree according to the drying temperature, thus preventing the temperature inside the drying chamber from becoming too high and causing a decline in grain quality.

[0015] Furthermore, it also includes an air intake fan, which is located at the third air intake. Attached Figure Description

[0016] Figure 1 This is a perspective view of the air inlet and outlet components of the grain dryer of this utility model.

[0017] Figure 2 This is an exploded view of the air inlet and outlet components of the grain dryer of this utility model.

[0018] Figure 3 This is an exploded view of the drying frame of this utility model.

[0019] Figure 4 This is a perspective view of part of the drying frame of this utility model.

[0020] Figure 5 This is a cross-sectional view of the drying frame of this utility model.

[0021] Figure 6This is a schematic diagram of the airflow path of the air inlet and outlet components of the grain dryer of this utility model.

[0022] Figure 7 This is a perspective view of another embodiment of the air inlet and return air assembly of the grain dryer of this utility model. Detailed Implementation

[0023] The following description, in conjunction with the accompanying drawings, illustrates an air inlet and outlet assembly for a grain dryer according to this utility model.

[0024] Example 1

[0025] like Figures 1 to 6 The illustrated grain dryer includes an air inlet and return assembly, comprising a drying shell 1 and a return air fan 2. Other equipment in the grain dryer helps the grain circulate through the drying shell 1, thus achieving uniform drying and preventing the grain from breaking due to prolonged heating. The drying shell 1 has a drying chamber, an air inlet chamber, and a return air chamber. The drying chamber is provided with a first air inlet 1113 and a return air inlet 1111. The first air inlet 1113 communicates with the return air chamber, and the return air inlet 1111 communicates with the air inlet chamber. The air inlet chamber and the return air chamber are connected by the second air inlet 1111. The air inlet 123 is connected, and the return air fan 2 is located at the second air inlet 123. The air inlet cavity has a third air inlet 121, and a guide plate 122 is provided inside the air inlet cavity. The guide plate 122 is located between the third air inlet 121 and the return air inlet 1111. Hot air enters through the third air inlet 121, and under the action of the guide plate 122 and the return air fan 2, hot air recirculation is formed in the drying cavity, the air inlet cavity, and the return air cavity. The system also includes an air inlet fan 4, which is located at the third air inlet 121. The outside of the air inlet fan 4 is connected to a hot air furnace, blowing the hot air generated by the hot air furnace into the air inlet cavity. Figure 6 As shown, after the hot air enters the air inlet chamber, it is guided by the air guide plate 122 to prevent the hot air from blowing directly to the return air inlet 1111. The return air fan 2 is started, and under the traction of the return air fan 2, the hot air flows into the drying chamber along the second air inlet 123 and the first air inlet 1113 to dry the grain in the drying chamber. After drying, the hot air flows out from the return air inlet 1111 and continues to be blown back into the drying chamber under the traction of the air guide plate 122 and the return air fan 2, forming a hot air return duct structure.

[0026] like Figure 2As shown, the drying housing 1 includes a drying frame 11, an air inlet frame 12, and a return air frame 13. The drying chamber, air inlet chamber, and return air chamber are correspondingly arranged in the drying frame 11, air inlet frame 12, and return air frame 13. The first air inlet 1113 and the return air inlet 1111 are arranged on the same first side 111 of the drying frame 11, and the first air inlet 1113 is located above the return air inlet 1111. The air inlet frame 12 and the return air frame 13 are fixed on the first side 111, and the return air frame 13 is correspondingly located above the air inlet frame 12. The drying frame 11 has openings at the top and bottom. Grain enters through the upper opening of the drying frame 11 and flows out through the lower opening, circulating and drying within the drying chamber. The first air inlet 1113 and the return air inlet 1111 are both located on the first side 111, making the connection of the air inlet frame 12 and the return air frame 13 simpler. Figure 5 As shown, the return air frame 13 is directly set above the air inlet frame 12. Whether it is hot air entering from the third air inlet 121 or hot air returning from the return air inlet 1111, it will be blown upward into the return air cavity under the guidance of the air guide plate 122 and the traction of the return air fan 2, and then blown into the drying cavity.

[0027] like Figures 1 to 6 As shown, it also includes an air inlet hood 17, an upper mounting base 15, a lower mounting base 16, a mesh-type air inlet pipe 6, and a mesh-type air outlet pipe 7. The upper mounting base 15 is fixed to the upper part of the drying chamber, the lower mounting base 16 is fixed to the lower part of the drying chamber, the upper end of the mesh-type air inlet pipe 6 is fixed to the upper mounting base 15, and the mesh-type air outlet pipe 7 is fixed to the lower mounting base 16. Figure 3As shown, the upper part of the lower mounting base 16 is a plug-in post 161. The mesh-type air outlet pipe 7 is inserted into the plug-in post 161 and fixed, so that the mesh-type air inlet pipe 6 and the mesh-type air outlet pipe 7 are vertically spaced in the drying chamber. The grain is dried between the mesh-type air inlet pipe 6 and the mesh-type air outlet pipe 7. The air inlet cover 17 covers the upper mounting base 15. The air inlet cover 17 is provided with an air inlet channel 171, which connects to the first air inlet 1113. The upper mounting base 15 is provided with a fourth air inlet 151, which connects to the air inlet channel 171 and the mesh-type air inlet pipe 6. The lower mounting base 16 is provided with an air outlet channel. 162, the mesh-type air outlet duct 7 is connected to the air outlet channel 162, the air outlet channel 162 is connected to the return air port 1111, hot air enters the air inlet chamber through the third air inlet 121, is drawn by the return air fan 2, enters the return air chamber through the second air inlet 123, is then blown into the air inlet channel 171 through the first air inlet 1113, is then blown into the mesh-type air inlet duct 6 through the fourth air inlet 151, enters the dried grain through the mesh holes on the mesh-type air inlet duct 6, enters the mesh-type air outlet duct 7 through the mesh holes on the mesh-type air outlet duct 7, enters the air outlet channel 162, and finally a portion of it returns to the air inlet chamber through the return air port 1111, forming a hot air recirculation structure.

[0028] like Figures 1 to 6 As shown, the drying shell 1 is also provided with an air outlet cavity, and the drying cavity is also provided with an air outlet 1121. The air outlet channel 162 is connected to the air outlet cavity through the air outlet 1121. Some of the hot air after drying the grain is discharged into the air outlet cavity through the air outlet channel 162 and the air outlet 1121.

[0029] like Figures 1 to 6 As shown, an air outlet fan 3 is installed in the air outlet cavity. The air outlet fan 3 and the return air fan 2 have the same power and the ratio of their quantities is 3:2:3. The arrangement of the air outlet fan 3 and the return air fan 2 can ensure that the air force generated by the return air fan 2 is greater than that of the air outlet fan 3, thereby ensuring the efficiency of hot air recirculation.

[0030] like Figures 1 to 6 As shown, the drying housing 1 also includes an air outlet frame 14, and the air outlet cavity is disposed in the air outlet frame 14.

[0031] like Figures 1 to 6 As shown, the drying frame 11 is also provided with a second side 112 opposite to the first side 111, and the air outlet 1121 is provided on the second side 112.

[0032] like Figures 1 to 6As shown, the first side 111 and the second side 112 are also provided with mesh plates (1112, 1122). The mesh holes on the mesh plates (1112, 1122) can increase the ventilation effect of the drying chamber. That is to say, the heat in the drying chamber can also flow to the air inlet chamber and the air outlet chamber through the mesh holes on the mesh plates (1112, 1122). The hot air entering the air inlet chamber also participates in the hot air return flow.

[0033] The mesh size of this application is smaller than that of the grain, so that it can be used for ventilation while preventing the grain from leaking out of the mesh.

[0034] Example 2

[0035] like Figure 7 As shown, it also includes a damper actuator 5 and a temperature sensor. Both the damper actuator 5 and the temperature sensor are commercially available products. The damper actuator 5 is preferably a multi-leaf damper. The temperature sensor is used to sense the drying temperature in the drying chamber. The damper actuator 5 is installed on the air inlet frame 12. The damper actuator 5 controls the opening degree according to the drying temperature. The drying chamber may experience overheating during drying, especially when multiple grain dryers are used in tandem. Overheating can lead to a decline in grain quality. To address this, the damper actuator 5, in conjunction with a temperature sensor, opens when the drying temperature is detected as too high, allowing cooler outside air to enter the drying chamber and thus lowering the drying temperature. This ensures the quality of the dried grain. A suitable drying temperature is crucial for better grain quality. Before drying, a stable drying temperature (hereinafter referred to as the set temperature) is set. Air intake begins at the start of drying. Since the temperature in the drying chamber has not yet reached the set temperature, the damper actuator 5 remains closed. Once the set temperature is reached, the damper actuator opens, allowing cool air to enter the drying chamber. If the drying temperature continues to rise, the opening of the damper actuator 5 is further increased; conversely, it is decreased. Other structural details are the same as in Example 1 and will not be repeated here.

[0036] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. An air inlet and return assembly for a grain dryer, characterized in that, The dryer shell comprises a drying frame, an air inlet frame and an air return frame, the drying chamber, the air inlet chamber and the air return chamber are correspondingly arranged in the drying frame, the air inlet frame and the air return frame, the first air inlet and the air return port are arranged on the same first side of the drying frame, and the first air inlet is arranged above the air return port, the air inlet frame and the air return frame are fixed on the first side, and the air return frame is arranged above the air inlet frame.

2. The air intake and return assembly of a grain dryer according to claim 1, wherein, The dryer shell comprises a drying frame, an air inlet frame and an air return frame, the drying chamber, the air inlet chamber and the air return chamber are correspondingly arranged in the drying frame, the air inlet frame and the air return frame, the first air inlet and the air return port are arranged on the same first side of the drying frame, and the first air inlet is arranged above the air return port, the air inlet frame and the air return frame are fixed on the first side, and the air return frame is arranged above the air inlet frame.

3. The air intake and return assembly of a grain dryer as claimed in claim 2, wherein, The dryer shell further comprises an air outlet frame, and the air outlet chamber is arranged in the air outlet frame.

4. The air intake and return assembly of a grain dryer as claimed in claim 3, wherein, The drying frame is further provided with a second side opposite to the first side, and the air outlet port is arranged on the second side.

5. The air intake and return assembly of a grain dryer as claimed in claim 4, wherein, The first side and the second side are further provided with a mesh plate.

6. The air intake and return assembly of a grain dryer of claim 4, wherein, The dryer shell further comprises an air inlet fan arranged at the third air inlet port.

7. The air intake and return assembly of a grain dryer of claim 4, wherein, The dryer shell further comprises an air inlet fan arranged at the third air inlet port.

8. The air intake and return assembly of a grain dryer of claim 7, wherein, ​ 9. The air intake and return assembly of a grain dryer of claim 2, wherein, ​ 10. The air intake and return assembly of a grain dryer of claim 1, wherein, ​

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