Movable grain pile interior cooling and dehumidifying device

Abstract

The invention discloses a movable grain pile interior cooling and dehumidifying device which is composed of an exhaust fan, a semiconductor chilling plate, a plate type heat pipe, a cooling fin, a supporting frame, an exhaust fan, a water collecting tank and a screen. The evaporation section of the heat pipe is inserted into a grain pile and separates grain through the screen, the condensation section is located outside the grain pile, the semiconductor chilling plate is adopted for refrigeration, the cooling fins dissipate heat of the semiconductor chilling plate, the supporting frame and the supporting plate are used for supporting the cooling module, and the exhaust fan is located around the granary and exhausts heat in the granary. Heat of the grain pile is exhausted through the exhaust fan, damp and hot air is cooled and condensed in a runner of the evaporation section of the heat pipe, condensed water flows into the water collecting tank, and cooled dry and cold air is circularly sucked into the grain pile. According to the invention, the convenience and energy conservation of cooling and dehumidification in the grain storage process are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of grain storage devices and is a device that can realize low-cost precise temperature control and dehumidification, and is green, environmentally friendly, energy-saving and efficient. Background Art

[0002] Some regions are facing challenges of aging grain storage facilities and insufficient storage capacity, and low logistics and transportation efficiency. Especially in remote areas, grain transportation and storage conditions are poor, resulting in increased grain losses and rising costs, which affects the timely supply and quality safety of grain. At the same time, the problem of grain preservation also needs to be solved urgently. The current preservation technology generally consumes a lot of energy and has a short preservation time. This project aims to improve the cooling and dehumidification method inside the grain pile to extend the preservation time of grain and reduce energy consumption.

[0003] There are several methods for cooling and dehumidifying grain piles in my country: 1. Exchange air inside and outside the grain pile by natural or mechanical means to reduce grain temperature and moisture; 2. Turn the grain surface regularly or as needed to promote air circulation and moisture dissipation; 3. Use low temperature seasons or grain coolers and other equipment to cool the grain to keep it in a low temperature state. He needs to open the doors and windows of the granary in the low temperature season and use natural cold sources for cooling; or use grain coolers for mechanical cooling.

[0004] The above-mentioned technical methods still have the following problems: 1. The cooling method of manual turning is inefficient and has poor cooling and dehumidification effects; 2. Traditional equipment cannot penetrate the interior of the grain pile and has high energy consumption, and cannot be accurately controlled according to the temperature and humidity status of the local area of ​​the grain pile, resulting in a large amount of unnecessary waste of energy. Therefore, this project aims to invent a movable grain pile internal dehumidification device, which can be flexibly arranged in areas with higher temperature and humidity based on the temperature and humidity monitoring inside the grain pile, to ensure rapid cooling and dehumidification inside the grain pile, reduce energy consumption and labor costs, and achieve the purpose of energy conservation and emission reduction. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a movable grain pile internal cooling and dehumidification device, which can effectively realize the precise control of temperature and humidity in the grain pile, while operating at low cost, significantly reducing manpower and equipment investment, and meeting the dual needs of energy conservation and emission reduction and cost control.

[0006] The present invention adopts the following technical scheme: a movable grain pile internal cooling and dehumidification device, the device comprises an exhaust fan, a semiconductor refrigeration sheet, a plate heat pipe, a heat sink, an exhaust fan, a water collection tank and a screen;

[0007] The plate heat pipe is inserted into the interior of the grain pile. The heat pipe is divided into a heat pipe evaporation section and a heat pipe condensation section. The heat pipe evaporation section is immersed in the grain. Vertical fins are welded on the outside of the heat pipe evaporation section to increase its heat receiving area. A screen is sleeved outside to separate the grain. The heat pipe condensation section is connected to a semiconductor refrigeration sheet. A heat sink is installed outside the semiconductor refrigeration sheet to increase its heat dissipation area and improve the heat dissipation efficiency. The heat dissipated by the heat sink is discharged to the upper part of the granary, and the exhaust fan installed in the upper part of the granary is used for exhausting.

[0008] The exhaust fan for sucking the humid and hot air inside the grain is located at the top of the screen. The exhaust fan extracts the humid and hot air inside the grain pile. The humid and hot air is cooled at the heat pipe evaporation section. The water vapor in the humid and hot air condenses at the heat pipe evaporation section. The condensed water flows to the water collecting tank. The water collecting tank is located below the plate heat pipe and is used to receive the condensed water flowing back and is discharged centrally through the water outlet. The dried and cooled air is discharged above the grain pile and then circulates into the grain pile, thereby achieving the purpose of cooling and dehumidifying the grain pile.

[0009] Preferably, the heat pipe evaporation section can be inserted into the grain to a depth of 1 - 8 m. The screen defines the screen aperture (1 - 3 mm) and the porosity ≥ 65% to separate the grain and prevent the grain from directly contacting the heat pipe evaporation section, causing the grain to be wetted by the condensed water and forming a directional migration path of "central dehumidification - peripheral drying".

[0010] Preferably, the cold end of the semiconductor refrigeration sheet adheres to the heat pipe condensation section to provide cold for the heat pipe condensation section. The hot end of the semiconductor refrigeration sheet adheres to the heat sink, and the heat sink increases the heat dissipation area of the semiconductor refrigeration sheet.

[0011] Preferably, the exhaust fan is arranged at an angle of 30° with the heat pipe evaporation section to enhance the negative pressure gradient inside the screen.

[0012] Preferably, the heat pipe evaporation section is sprayed with a polytetrafluoroethylene nano - coating with a contact angle ≥ 150° to form a hydrophobic layer and accelerate the gravity backflow of the condensed water.

[0013] Preferably, a support plate and a support frame are installed above the screen to support the heat sink.

[0014] Preferably, multiple individual devices are networked to achieve three - dimensional temperature control of the granary, or are linked with the grain condition monitoring system to trigger automatic start and stop.

[0015] The present invention can set the installation depth and refrigeration power for different grain varieties (wheat, corn, rice). The present invention is a portable and movable device, which can be adjusted and arranged according to the actual situation of the granary to achieve precise management of the humidity and temperature in the warehouse and reduce the operation cost.

[0016] Beneficial effects:

[0017] 1. This device solves the space limitation through a movable insertion structure. It can be flexibly arranged according to the temperature and humidity monitoring in the bin, achieving regional precise control within the grain pile. This device shortens the time for the local high-temperature area (>45°C) to cool down to 20°C from 72 hours to 5 hours. The energy consumption for cooling per unit volume of grain is ≤0.15 kWh / ton, saving 62% energy compared with the traditional centrifugal fan system.

[0018] 2. The semiconductor active refrigeration breaks through the limitation of ambient temperature on the heat pipe efficiency, enhances the effect of cooling and dehumidification inside the grain pile, and the refrigeration efficiency is increased by more than 40%. The humidity gradient difference in the grain pile is increased from 8% RH / m of the traditional technology to 15% RH / m, realizing the directional migration of moisture.

[0019] 3. The double-cycle air flow design of the exhaust fan - extraction fan strengthens the directional flow of hot and humid air. The structure is simple and reliable, with low cost, avoiding the problems of high cost, single function and poor effect existing in technical means such as manual bin transfer for cooling or high-power mechanical ventilation for cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a movable internal cooling and dehumidification device for grain piles of the present invention;

[0021] Figure 2 It is a cross-sectional view of a movable internal cooling and dehumidification device for grain piles of the present invention;

[0022] Figure 3 It is a schematic diagram at the evaporation section of the heat pipe of the present invention;

[0023] Figure 4 It is a schematic diagram at the condensation section of the heat pipe of the present invention;

[0024] Figure 5 It is a schematic diagram of the extraction fan of the present invention;

[0025] Figure 6 It is a comparison diagram of the temperatures of each area when the device is started with the initial temperature of the granary being 45°C;

[0026] Figure 7 It is a comparison schematic diagram of the humidity changes in the granary at different initial temperatures;

[0027] In the figure: 1 is the exhaust fan, 2 is the semiconductor refrigeration sheet, 3 is the plate heat pipe, 301 is the evaporation section of the heat pipe, 302 is the condensation section of the heat pipe, 4 is the heat sink, 5 is the extraction fan, 6 is the grain, 7 is the water collecting tank, 8 is the screen, 9 is the support plate, 10 is the support frame. DETAILED DESCRIPTION OF THE INVENTION

[0028] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0029] As Figures 1-5As shown in the figure, a movable device for cooling and dehumidifying the interior of a grain pile, the device includes an exhaust fan 1, a semiconductor refrigeration sheet 2, a plate heat pipe 3, a heat sink 4, a suction fan 5, a water collecting tank 7, a screen 8, a support plate 9 and a support frame 10;

[0030] The plate heat pipe 3 is inserted into the grain 6 according to the specific situation of the grain pile. The plate heat pipe 3 includes a heat pipe evaporation section 301 and a heat pipe condensation section 302. The heat pipe evaporation section 301 is placed inside the grain 6, and the heat pipe condensation section 302 is equipped with a semiconductor refrigeration sheet 2 and a heat sink 4. The semiconductor refrigeration sheet 2 is adhered to the surface of the heat pipe condensation section 302 to enhance the heat dissipation efficiency of the plate heat pipe 3. The cold end of the semiconductor refrigeration sheet 2 is in contact with the heat pipe condensation section 302, and the hot end is in contact with the heat sink 4. The function of the heat sink 4 is to expand the heat dissipation area and dissipate the heat generated by the semiconductor refrigeration sheet 2 to the upper area of the granary. An exhaust fan 1 is installed in the upper area of the granary and is discharged from the granary by the exhaust fan 1. The heat generated inside the grain is extracted by the suction fan 5, and the extracted humid and hot air flows through the screen 8 and cools and condenses on the surface of the heat pipe evaporation section 301. The condensed water flows back to the water collecting tank 7 under the influence of gravity. The working fluid inside the heat pipe evaporation section 301 absorbs this heat through phase change and then rises to the heat pipe condensation section 302 to cool down. The semiconductor refrigeration sheet 2 absorbs the heat transferred by the heat pipe condensation section 302, thereby maintaining the low temperature of the heat pipe evaporation section 301.

[0031] In order to increase the heat absorption area and improve the efficiency, fins are welded to the heat pipe evaporation section 301. At the same time, the fins are wrapped with a screen 8 to prevent the grain 6 from directly contacting the heat pipe evaporation section and causing the grain to be soaked by the condensed water;

[0032] In order to save energy and reduce consumption, the dried and cooled air is extracted by the suction fan 5, enters the interior of the grain pile again through the surface of the grain pile, and circulates to cool and dehumidify the grain.

[0033] The movable device for dehumidifying the interior of the grain pile can be arranged flexibly inside the granary according to the actual situation.

[0034] Test results:

[0035] The rectangular experimental granary faces due south. Thermometers are set at six positions, respectively marked as semiconductor, inside the screen, granary measuring point 1, granary measuring point 2, granary measuring point 3, and granary measuring point 4. After the experiment starts, data is recorded every 5 minutes.

[0036] The initial temperature of the experimental granary is heated to 45 °C, and the experimental data is as Figure 6 shown. After the device works for 20 minutes, the average temperature drops by about 5 °C. By keeping the initial humidity constant at 65% ± 1%, the change in the humidity of the grain pile at different temperatures is tested, as Figure 7As shown, after the device works for 20 minutes, the humidity drops by an average of 20%, demonstrating a good cooling and dehumidifying effect. The overall experiment meets the expectations.

[0037] This device can be flexibly arranged inside the granary according to the temperature and humidity monitoring conditions in the granary, achieving regional precise control within the grain pile and further reducing energy consumption.

[0038] This device achieves the dual purposes of cooling and dehumidifying inside the grain pile, has a simple and reliable structure, low cost, and avoids the problems of high cost, single function, and poor effect existing in technical means such as manual transfer of the granary for cooling or high-power mechanical ventilation for cooling.

[0039] It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle described in this invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as within the protection scope of this invention.

Claims

1. A movable grain pile internal cooling and dehumidification device, characterized in that: The device comprises an exhaust fan (1), a semiconductor cooling sheet (2), a plate-type heat pipe (3), a heat sink (4), an exhaust fan (5), a water collecting tank (7) and a screen (8); The plate-type heat pipe (3) is inserted into the grain pile, and the heat pipe is divided into a heat pipe evaporation section (301) and a heat pipe condensation section (302); the heat pipe evaporation section (301) is immersed in the grain (6), and the heat pipe evaporation section (301) is welded with vertical fins on the outside, and a screen (8) is covered on the outside; the heat pipe condensation section (302) is connected to the semiconductor refrigeration sheet (2), and a heat sink (4) is installed outside the semiconductor refrigeration sheet (2); the heat emitted by the heat sink (4) is discharged to the upper part of the grain silo, and is exhausted by an exhaust fan (1) installed on the upper part of the grain silo; The exhaust fan (5) for sucking the moist hot air inside the grain is located at the top of the screen (8). The exhaust fan (5) extracts the moist hot air in the grain pile. The moist hot air is cooled at the evaporation section (301) of the heat pipe. The water vapor in the moist hot air is condensed at the evaporation section (301) of the heat pipe. The condensed water flows to the water collecting tank (7). The water collecting tank (7) is located below the plate-type heat pipe (3) and is used to receive the refluxed condensed water and discharge it in a centralized manner through the water outlet. The dry and cold air that has been cooled and dehumidified is discharged above the grain pile and then circulated into the grain pile.

2. The movable grain pile internal cooling and dehumidification device according to claim 1 is characterized in that: The heat pipe evaporation section (301) is inserted into the grain to a depth of 1-8m, and the screen (8) is limited to a screen aperture of 1-3mm and a porosity of ≥65%.

3. The movable grain pile internal cooling and dehumidification device according to claim 2 is characterized in that: The cold end of the semiconductor refrigeration sheet (2) is adhered to the heat pipe condensation section (302), and the hot end of the semiconductor refrigeration sheet (2) is adhered to the heat sink (4).

4. The movable grain pile internal cooling and dehumidification device according to claim 3, characterized in that: The exhaust fan (5) is arranged at an angle of 30° to the heat pipe evaporation section (301).

5. The movable grain pile internal cooling and dehumidification device according to claim 4, characterized in that: The heat pipe evaporation section (301) is sprayed with a polytetrafluoroethylene nano coating with a contact angle of ≥150° to form a hydrophobic layer.

6. The movable grain pile internal cooling and dehumidification device according to claim 5, characterized in that: A support plate (9) and a support frame (10) are arranged above the screen (8) to support the heat sink (4).

7. The movable grain pile internal cooling and dehumidification device according to claim 6, characterized in that: A plurality of the above-mentioned devices can be networked to realize three-dimensional temperature control of the granary, or can be linked with the grain condition monitoring system to trigger automatic start and stop.

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