Positive pressure ventilation apparatus and method for grain driers

Abstract

The application discloses a positive pressure ventilation equipment and method for a grain dryer, which comprises a drying section, a hot air blower arranged outside the drying section, a duct connected between the drying section and the hot air blower and allowing hot air to pass through, and a self-adjusting part. The duct is divided into two sections along the direction from the hot air blower to the drying section, the first section is a straight cylinder, and the second section gradually increases in cross-sectional size along the hot air pushing direction and forms an expanding structure. The second section is bent outward and forms a protruding part, and an inclined point is arranged inside the protruding part. The self-adjusting part is arranged in the protruding part to tilt around the inclined point and adjust the hot air passage size of the protruding part. The above structure changes the negative pressure air suction into positive pressure air pushing, the hot air distribution of the drying section is more uniform, and the energy consumption is lower.

Description

Technical Field

[0001] This invention relates to the technical field of grain dryers, and more specifically to positive pressure ventilation equipment and methods for grain dryers. Background Technology

[0002] Grains are a general term for cereal plants or food crops, covering a wide range including rice, wheat, millet, soybeans, and other miscellaneous grains. They are mainly plant seeds and fruits and are the traditional staple food of many Asian people. Grains need to be dried using a dryer when stored.

[0003] Various grain dryers are known in this field, and they can be classified according to their structural features for grain displacement paths and for the circulation of drying air. Currently, in existing dryers, the hot air structure is mostly arranged in the drying section, and the hot air fan is mostly designed at the air outlet of the drying section. The system heating is achieved through a negative pressure structure. Taking the 50H series grain dryer as an example, the energy consumption of controlling the hot air volume using a negative pressure structure is relatively high. On average, 200,000 calories are lost per drying cycle. In addition to high energy consumption, the ventilation in the drying section is not uniform, resulting in limited energy utilization. To address these issues, we provide a positive pressure ventilation device and method for grain dryers. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a positive pressure ventilation device and method for grain dryers, which changes negative pressure suction to positive pressure push, resulting in more uniform hot air distribution in the drying section and lower energy consumption.

[0005] To achieve the above objectives, the present invention employs a positive pressure ventilation device for a grain dryer, comprising: a positive pressure ventilation device for a grain dryer, comprising:

[0006] Drying section;

[0007] A hot air blower is installed outside the drying section. A duct is connected between the drying section and the hot air blower to allow hot air to pass through, so that the hot air inside the hot air blower can be pushed into the inner cavity of the drying section through the duct.

[0008] The aforementioned conduit is divided into two sections along the direction from the hot air blower to the drying section. The first section is cylindrical, and the cross-sectional size of the second section gradually increases along the direction of hot air propulsion, forming a flared structure.

[0009] The above structure changes the negative pressure suction to positive pressure push, resulting in a more uniform distribution of hot air in the drying section and lower energy consumption.

[0010] Considering that the air intake provided by existing hot air blowers is mostly manually controlled, and although the hot air blowers are equipped with temperature displays, the temperature control accuracy is limited due to factors such as differences in ambient temperature, varying operator experience, and slow temperature adjustment response. Therefore, we have made a simple improvement in the second section by adding a simple mechanical structure to achieve self-adjustment of the air duct. The specific structure is shown below:

[0011] The self-adjusting component has a second bent portion that protrudes outward to form a protrusion. The protrusion has an inclination point inside. The self-adjusting component is arranged inside the protrusion to tilt around the inclination point and adjust the size of the hot air passage of the protrusion. When the pressure difference between the outlet and the inlet increases under positive pressure, the self-adjusting component rotates sequentially in the first rotation direction and gradually restricts the airflow opening of the hot air passage of the protrusion. When the pressure difference between the inlet and the outlet increases under positive pressure, the self-adjusting component rotates sequentially in the second rotation direction and gradually expands the airflow opening of the hot air passage of the protrusion.

[0012] The self-adjusting component includes a connecting part and a control part. One end of the connecting part is rotatably arranged with the tilt point, and the control part is elongated and located in the hot air channel of the protrusion to rotate under the action of pressure difference. The upper and lower edges of the hot air channel of the protrusion are located in the outer rotation path of the control part. The other end of the connecting part extends outward and forms a limiting end. The top wall of the protrusion is located in the rotation path of the limiting end. The end of the connecting part connected to the tilt point is a hook to realize the swinging action of the self-adjusting component through the hook structure.

[0013] The aforementioned drying sections are generally divided into mixed-flow and cross-flow types. Taking the cross-flow type as an example, the aforementioned drying section has a cross-flow structure. This drying section has multiple ventilation channels through which heated air passes and horizontal plates located on both sides of the ventilation channels for the grain to pass through from top to bottom. The horizontal plates have mesh holes to allow the airflow in the ventilation channels to connect with the grain channels in the horizontal plates.

[0014] The preheating utilization rate of the drying section of the above-mentioned crossflow structure is low when using a positive pressure ventilation structure. To address this, we have improved the ventilation channel of the above-mentioned crossflow structure to enhance the hot air utilization effect of the ventilation channel. Specifically, the above-mentioned ventilation channel has a first ventilation plate and a second ventilation plate arranged alternately from top to bottom. The first ventilation plate and the second ventilation plate are interconnected. Both sides of the first ventilation plate and the second ventilation plate have side holes for hot air to pass through. The end of the first ventilation plate facing the hot air blower is open and the other end is closed. The end of the second ventilation plate facing the hot air blower is closed and the other end is open. The first ventilation plate and the second ventilation plate are of equal length and arranged in parallel.

[0015] A positive pressure ventilation method for grain dryers is implemented by adopting the positive pressure ventilation equipment for grain dryers described in the above scheme to enhance the positive pressure ventilation effect of grain dryers.

[0016] The positive pressure ventilation device and method for grain dryers of the present invention have the following beneficial effects:

[0017] 1. The positive pressure ventilation device for the grain dryer of the present invention, by changing negative pressure suction to positive pressure push, results in a more uniform distribution of hot air in the drying section and lower energy consumption;

[0018] 2. The positive pressure ventilation device for the grain dryer of the present invention takes into account that the air intake provided by the existing hot air blower is mostly manually operated. Although the hot air blower is equipped with a temperature display, the temperature control accuracy is limited due to the influence of ambient temperature differences, differences in the technical experience of operators, and slow temperature adjustment response speed. Therefore, a simple improvement is made in the second section to add a simple self-adjusting component to realize the self-adjustment of the air duct.

[0019] 3. The positive pressure ventilation device for the grain dryer of the present invention improves the ventilation channel for the drying section with a crossflow structure by arranging the first ventilation plate and the second ventilation plate alternately from top to bottom, thereby extending the flow time of hot air in the ventilation channel, expanding the flow path of hot air, and improving the utilization effect of hot air.

[0020] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope as a result, and the embodiments of the present invention include many changes, modifications and equivalents. Attached Figure Description

[0021] Figure 1 A three-dimensional structural diagram of a grain dryer with positive pressure ventilation equipment;

[0022] Figure 2 This is a schematic diagram of the main structure of a grain dryer with positive pressure ventilation equipment;

[0023] Figure 3 This is a schematic diagram of the operation of the self-adjusting component of the present invention;

[0024] Figure 4 This is a schematic diagram of the main structure of the protruding part in this invention;

[0025] Figure 5 This is a schematic diagram of the main structure of the self-adjusting component in this invention;

[0026] Figure 6 This is a schematic diagram of the main structure of the ventilation channel in this invention.

[0027] In the diagram: 1. Drying section; 2. Hot air blower; 3. Duct; 4. Self-adjusting component; 11. Ventilation channel; 31. First section; 32. Second section; 41. Connecting part; 42. Control part; 43. Limiting end; 111. First ventilation plate; 112. Second ventilation plate; 113. Side hole; 321. Protrusion; 322. Inclined point. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0029] It should be noted that when an element is referred to as "set on" or "provided with" another element, it can be directly on the other element or there may be an intermediate element. When an element is referred to as "connected to" or "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. "Fixed connection" means fixed connection. There are many ways of fixed connection, which are not within the scope of protection of this document. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0030] 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 in the specification herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Please refer to the instruction manual appendix. Figure 1 and instruction manual Figure 2 The instruction manual is attached. Figure 1 and instruction manual Figure 2 A common grain dryer with positive pressure ventilation is shown; see reference for details. Figure 2 The aforementioned positive pressure ventilation equipment is installed on the drying section 1 of the grain dryer.

[0032] In detail, the hot air blower 2 is located outside the drying section 1. The drying section 1 and the hot air blower 2 are connected by a duct 3 that allows hot air to pass through. After the hot air blower 2 is started, the hot air in the hot air blower 2 is pushed into the inner cavity of the drying section 1 through the duct 3, realizing the pushing air intake of hot air, that is, positive pressure ventilation. This changes the traditional suction-type negative pressure ventilation to the pushing-type positive pressure ventilation, making the hot air distribution in the drying section more uniform and the energy consumption lower.

[0033] For detailed reference Figure 2In this embodiment, the conduit is divided into two sections. Specifically, the conduit 3 is divided into two sections along the direction from the hot air blower 2 to the drying section 1. The first section 31 is cylindrical, and the second section 32 gradually increases in cross-sectional size along the hot air pushing direction and forms a flared structure.

[0034] In this embodiment, the connection between the first segment 31 and the second segment 32 has a bent portion. In this embodiment, the bent portion is a protrusion 321, that is, the bent portion of the second segment 32 protrudes outward and forms a protrusion 321.

[0035] For detailed reference Figures 3-5 The protrusion 321 has an inclination point 322 inside, and the self-adjusting component 4 is arranged inside the protrusion 321 to tilt around the inclination point 322 and adjust the size of the hot air passage of the protrusion 321.

[0036] The working principle of the self-adjusting component 4 mentioned above is as follows: Figure 3 As shown, when the pressure difference between the outlet and the inlet increases under positive pressure, that is, when the air volume is large, under the action of the pressure difference, the self-adjusting component 4 rotates sequentially in the first rotation direction and gradually restricts the airflow opening of the hot air channel of the protrusion 321 to reduce the incoming air volume.

[0037] When the pressure difference between the inlet and outlet increases under positive pressure, i.e. when the air volume is small, the self-adjusting component 4 rotates sequentially in the second rotation direction and gradually expands the airflow opening of the hot air passage of the protrusion 321. That is, under the action of the pressure difference, the size of the hot air passage is increased, and the air volume is increased.

[0038] It should be noted that the appendix Figure 3 The reference numeral for the first rotational direction is R1, and the reference numeral for the second rotational direction is R2.

[0039] The design of the self-adjusting component 4 is to make the hot air volume entering the drying section more uniform. Through the proposed self-adjusting component 4, a uniform air volume is achieved in the drying section, ensuring the drying effect of the drying section.

[0040] For detailed reference Figure 4 as well as Figure 5 ,Should Figure 4 as well as Figure 5An exemplary structure of the self-adjusting component 4 is shown. In this example, the self-adjusting component 4 includes a connecting portion 41 and a control portion 42. One end of the connecting portion 41 is rotatably arranged with the tilt point 322. The control portion 42 is elongated and located within the hot air channel of the protrusion 321 to rotate under the action of pressure difference. The upper and lower edges of the hot air channel of the protrusion 321 are located within the outer rotation path of the control portion 42. The other end of the connecting portion 41 extends outward and forms a limiting end 43. The top wall of the protrusion 321 is located within the rotation path of the limiting end 43. One end of the connecting portion 41 connected to the tilt point 322 is a hook to realize the swinging action of the self-adjusting component 4 through the hook structure.

[0041] Please refer to the instruction manual appendix. Figure 1 -Instruction manual included Figure 6 We propose further embodiments of a grain dryer with positive pressure ventilation equipment, see details below. Figure 2 The aforementioned positive pressure ventilation equipment is installed on the drying section 1 of the grain dryer.

[0042] In this embodiment, including

[0043] Drying section 1;

[0044] A hot air blower 2 is installed outside the drying section 1. A duct 3 is connected between the drying section 1 and the hot air blower 2 to allow hot air to pass through, so that the hot air in the hot air blower 2 is pushed into the inner cavity of the drying section 1 through the duct 3.

[0045] The aforementioned conduit 3 is divided into two sections along the direction from the hot air blower 2 to the drying section 1. The first section 31 is cylindrical, and the second section 32 gradually increases in cross-sectional size along the direction of hot air propulsion and forms a flared structure.

[0046] Considering that the above-mentioned drying section 1 is generally divided into mixed flow type and cross flow type, taking the cross flow type as an example, the above-mentioned drying section 1 is a cross flow structure. The drying section 1 has multiple ventilation channels 11 through which hot air passes and horizontal plates located on both sides of the ventilation channels 11 for the grain to pass through from top to bottom. The horizontal plates have mesh holes to allow the airflow in the ventilation channels to communicate with the grain channels in the horizontal plates.

[0047] When using a positive pressure ventilation structure, the preheating utilization rate of the drying section 1 of the above-mentioned crossflow structure is low. To address this, we have improved the ventilation channel 11 of the above-mentioned crossflow structure to enhance the hot air utilization effect of the ventilation channel 11. Specifically, the ventilation channel 11 has a first ventilation plate 111 and a second ventilation plate 112 arranged alternately from top to bottom. The first ventilation plate 111 and the second ventilation plate 112 are interconnected. Both sides of the first ventilation plate 111 and the second ventilation plate 112 have side holes 113 for hot air to pass through. The end of the first ventilation plate 111 facing the hot air blower 2 is open and the other end is closed. The end of the second ventilation plate 112 facing the hot air blower is closed and the other end is open. The first ventilation plate 111 and the second ventilation plate 112 are of equal length and arranged in parallel.

[0048] The above structure is for the drying section 1 of the crossflow structure. The ventilation channel 11 is improved by having a first ventilation plate 111 and a second ventilation plate 112 arranged alternately from top to bottom, thereby extending the flow time of hot air in the ventilation channel 11, expanding the flow path of hot air and improving the utilization effect of hot air.

[0049] It also includes a positive pressure ventilation method for grain dryers, which implements the positive pressure ventilation equipment for grain dryers described in the above scheme to enhance the positive pressure ventilation effect of the grain dryer.

[0050] In detail, this grain dryer uses a positive pressure ventilation method. After the hot air blower 2 is started, the hot air inside the hot air blower 2 is pushed into the inner cavity of the drying section 1 through the duct 3, realizing the pushing of hot air in, i.e., positive pressure ventilation. This changes the traditional suction-type negative pressure ventilation to a propulsion-type positive pressure ventilation, resulting in a more uniform distribution of hot air in the drying section and lower energy consumption. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positive pressure ventilation device for a grain dryer, characterized in that, include: Drying section (1); A hot air blower (2) is installed outside the drying section (1). A duct (3) that allows hot air to pass through is connected between the drying section (1) and the hot air blower (2) so that the hot air in the hot air blower (2) can be pushed into the inner cavity of the drying section (1) through the duct (3). The drying section (1) is a crossflow structure. The drying section (1) has multiple ventilation channels (11) through which heating air passes and horizontal plates located on both sides of the ventilation channels (11) for grain to pass through from top to bottom. The horizontal plates have mesh holes to allow the airflow in the ventilation channels (11) to communicate with the grain channel in the horizontal plates. The ventilation channel (11) is arranged with a first ventilation plate (111) and a second ventilation plate (112) in a staggered manner from top to bottom. Both sides of the first ventilation plate (111) and the second ventilation plate (112) have side holes (113) for hot air to pass through. The first ventilation plate (111) and the second ventilation plate (112) are connected to each other. The first ventilation plate (111) has an open end facing the hot air blower (2) and a closed end on the other end. The second ventilation plate (112) has a closed end facing the hot air blower and an open end on the other end. The above-mentioned conduit (3) is divided into two sections along the direction from the hot air blower (2) to the drying section (1). The first section (31) is a straight cylinder, and the second section (32) gradually increases in cross-sectional size along the direction of hot air pushing and forms a flared structure. Also includes: The self-adjusting component (4) has a second section (32) with a bent portion that protrudes outward to form a protrusion (321). The protrusion (321) has an inclination point (322) inside. The self-adjusting component (4) is arranged inside the protrusion (321) to tilt around the inclination point (322) and adjust the size of the hot air passage of the protrusion (321). When the pressure difference between the outlet and the inlet increases under positive pressure, the self-adjusting component (4) rotates sequentially in the first rotation direction and gradually restricts the airflow opening of the hot air passage of the protrusion (321). When the pressure difference between the inlet and the outlet increases under positive pressure, the self-adjusting component (4) rotates sequentially in the second rotation direction and gradually expands the airflow opening of the hot air passage of the protrusion (321). The ventilation channel (11) is improved to have a first ventilation plate (111) and a second ventilation plate (112) arranged alternately from top to bottom. The self-adjusting component (4) includes a connecting part (41) and a control part (42). One end of the connecting part (41) is rotatably arranged with the tilt point (322). The control part (42) is elongated and located in the hot air channel of the protrusion (321) to rotate under the action of pressure difference. The upper and lower edges of the hot air channel of the protrusion (321) are located in the outer rotation path of the control part (42). The other end of the connecting portion (41) extends outward and forms a limiting end (43), and the top wall of the protrusion (321) is located within the rotation path of the limiting end (43); The end of the connection part (41) connected to the tilt point (322) is a hook to realize the swinging action of the self-adjusting component (4) through the hook structure.

2. The positive pressure ventilation equipment for a grain dryer according to claim 1, characterized in that: The first ventilation panel (111) and the second ventilation panel (112) are of equal length and arranged in parallel.

3. A positive pressure ventilation method for grain dryers, characterized in that: Implement the positive pressure ventilation equipment for grain dryers as described in claim 1 or claim 2.

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