A temperature and humidity modulation device for a low-temperature fresh-keeping metal granary

Abstract

The present invention relates to the technical field of temperature and humidity regulation in vertical silos, and specifically to a temperature and humidity modulation device for a low-temperature fresh-keeping metal granary. The temperature and humidity modulation device includes an exhaust pipe, multiple layers of arc-shaped grooves, a partition plate, heat dissipation strips, and exhaust holes; the exhaust pipe is arranged at the central position inside the silo, and the cold air discharged by the cooler enters the silo through the exhaust pipe. Multiple layers of the arc-shaped grooves are formed on the exhaust pipe, and the arc-shaped grooves are arranged in a circumferential array on the outer surface of the exhaust pipe. The partition plate is arranged on the inner side wall of the silo, and a ring groove is formed between the partition plate and the silo. The heat dissipation strips are arranged in multiple layers in an array on the side wall of the partition plate. By arranging a partition plate between the silo wall and the granary in the present invention, a space is generated between the silo wall and the granary. The cold air released by the cooler fills the space after cooling the grain pile, and the cold air is mixed with the temperature on the silo wall, thereby reducing the temperature difference between the silo wall after absorbing heat and the grain, and effectively preventing the grain from dew condensation due to the temperature difference.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature and humidity regulation in vertical silos, and particularly to a temperature and humidity modulation device for a low-temperature fresh-keeping metal granary. Background Art

[0002] With the continuous increase in production, the role of storage granaries is particularly important. Currently, the majority of storage granaries are flat warehouses, shallow silos, and vertical silos. Compared with flat warehouses and shallow silos, vertical silos have the advantages of large effective storage capacity, small floor area, and good ventilation management. Before the grain is put into the silo, the moisture content of the grain pile is maintained at 12% - 14%. After the grain is put into the silo, strict monitoring of the grain condition in the silo and reasonable ventilation and other means are adopted to ensure the safe storage of the grain.

[0003] Before the grain enters the vertical silo, the impurities in the grain are screened or winnowed to ensure the purity of the grain. Subsequently, for the overly wet grain, dehumidification treatment is carried out by ventilation or drying. After the impurity removal and dehumidification are completed, the grain is transported to the entrance of the vertical silo through a bucket elevator and then sent into the silo. Finally, low-dose circulating fumigation with phosphine is implemented for the newly stored grain. In autumn and winter, mechanical ventilation is carried out using natural low temperature to eliminate the risk of condensation. In spring, heat insulation and temperature control are carried out by airtightness. In summer, the accumulated heat is removed regularly by a grain cooler to achieve year-round low-temperature storage;

[0004] However, Taizhou belongs to the subtropical monsoon climate region. In summer, it is controlled by the summer monsoon, with high temperature and abundant rainfall. This climate characteristic makes Taizhou experience long-term high temperature and relatively high humidity in summer. When the cooler cools the grain pile, the metal-structured granary is easily affected by the high summer temperature. Grain is a poor conductor of heat, and the heat transfer is slow. When the external temperature is higher than the grain temperature, the situation of "hot skin and cold core" will occur. Therefore, the grain near the metal silo wall is prone to condensation when encountering the relatively hot wall, and it is easy to cause the grain near the side wall of the granary to dew, heat up, and mildew, affecting the safety and nutritional value of the grain.

[0005] In the existing grain bin ventilation method, air enters from the bottom air inlet, flows upward along the grain pile, and finally discharges from the top. Since the air flow path in the bin is relatively long, the longitudinal ventilation efficiency is low, and the air flow moves non-linearly in the grain pile, with a longer ventilation path around the perimeter compared to other parts. This means that in the corner and edge areas of the grain pile, due to the non-linear movement of the air flow and the large resistance, the ventilation effect is poor and dead zones are likely to occur. In addition, in order to avoid the situation of "hot skin and cold core" in the prior art, heat insulation and cold preservation measures are taken, such as sealing the air ducts, closing the doors and windows, maintaining the "cold air" or ventilating through a blower to reduce the moisture on the side walls. However, the existing ventilation means lack in-depth systematic research on the micro-air flow in the grain pile, the heat and moisture transfer in the grain pile, and their impact on the quality and control technology. This results in limited control means for local grain condition changes in actual operation, making it difficult to achieve precise local ventilation. There are only single-tube ventilation or manual methods such as digging trenches and ridges on the grain surface to disperse moisture and heat. These operations are time-consuming, laborious, and inefficient, and these traditional ventilation means cannot meet the requirements of large-scale and modern grain bin management.

[0006] Therefore, a temperature and humidity modulation device for a low-temperature fresh-keeping metal grain bin is proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a temperature and humidity modulation device for a low-temperature fresh-keeping metal grain bin. The cold air discharged by the cooler enters the annular groove and the silo respectively. By using the cold air in the annular groove to reduce the temperature difference between the heat absorbed by the bin wall and the grain, while preventing the grain on the side wall from condensing due to the temperature difference, the cold air in the silo forms multiple horizontally parallel flow layers due to the negative pressure gas flow. While improving the temperature reduction and humidity adjustment efficiency, it can also quickly take the heat and moisture on the side wall of the silo out of the silo.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A temperature and humidity modulation device for a low-temperature fresh-keeping metal granary. The granary includes a conveying pipe, a silo arranged at the bottom of the conveying pipe, a cooler arranged on one side of the silo, and an air inlet pipe opened at the bottom of the silo. The cooler is communicated with the air inlet pipe. The temperature and humidity modulation device includes an exhaust pipe, multiple layers of arc grooves, partition plates, heat dissipation strips, exhaust holes, annular grooves and grooves; the exhaust pipe is arranged at the central position inside the silo, and the cold air discharged by the cooler enters the silo through the exhaust pipe. Multiple layers of the arc grooves are opened on the exhaust pipe, and the multiple layers of arc grooves are spirally arranged on the outer surface of the exhaust pipe. The partition plates are arranged on the inner side wall of the silo. An annular groove is opened between the partition plate and the silo. The annular groove is communicated with the air inlet pipe through the groove. The cold air discharged by the cooler enters the annular groove and the arc groove respectively. Multiple groups of the heat dissipation strips are arranged, and the heat dissipation strips are spirally arrayed on the side wall of the partition plate, and the heat dissipation strips correspond layer by layer to the multiple layers of arc grooves. Multiple groups of the exhaust holes are arranged and opened at the top of the silo.

[0010] It can be seen that granaries with metal structures are vulnerable to the influence of high temperatures in summer. Grains are poor conductors of heat, and heat transfer is slow. When the external temperature is higher than the grain temperature, a situation of "hot skin and cold core" will occur. Therefore, the grains near the metal silo wall are prone to condensation when encountering the relatively hot wall surface, and it is easy to cause the grains near the side wall of the granary to dew, heat up, and mildew, affecting the safety and nutritional value of the grains. In the present invention, by arranging a partition plate between the silo wall and the granary, an annular groove is generated between the silo wall and the granary, which can reduce the temperature difference between the silo wall after absorbing heat and the grains, and at the same time can cool the grains in contact with the side wall of the silo, effectively preventing the grains from dewing due to the temperature difference, and can also improve the efficiency of temperature reduction and humidity adjustment, remove the water vapor on the silo wall, make the airflow distribution in the granary more uniform, and achieve the same temperature reduction effect in a shorter time and with higher efficiency.

[0011] In addition, the lateral ventilation path of the present invention is shorter than the existing longitudinal ventilation, has a small unit ventilation resistance, and has fewer ventilation dead corners. Therefore, after ventilation, the temperature uniformity of each part of the grain pile has been significantly improved.

[0012] Preferably, the side wall of the partition plate is in an inclined state, and the cross-section of the annular groove is narrow at the top and wide at the bottom. More cold air can be gathered at the bottom of the annular groove for temperature reduction compared to the upper part. In addition, when the grains are discharged, they can smoothly reach the bottom along the inclined surface of the partition plate, reducing the impact when the grains are discharged.

[0013] Preferably, the annular groove is spiral, the annular grooves are uniformly distributed along the vertical direction of the silo, and multiple groups of the heat dissipation strips are adapted to the number of spiral turns and spiral angles of the annular groove. The starting end of the annular groove is located at the bottom of the silo, and the end is located above the silo; it can fully cool the inner side wall of the silo and also take away the water vapor on it.

[0014] Preferably, the groove penetrates through the annular groove and the partition board, and the exhaust hole is communicated with the annular groove. While the cold air enters the granary, it will also enter the annular groove.

[0015] Preferably, a convex block is arranged below the arc-shaped groove. The convex block and the edge of the arc-shaped groove form an inclined surface, and the inclination angle of the inclined surface gradually increases from the edge of the arc-shaped groove to the convex block. By installing an exhaust pipe at the bottom of the feeding port, the grain will contact the exhaust pipe first during the falling process, which can slow down the falling speed of the grain and reduce the direct impact on the bottom of the bin, thereby effectively reducing the possibility of grain breakage.

[0016] Preferably, two groups of channels are also arranged in the arc-shaped groove. The two groups of channels are arranged on both sides of the arc-shaped groove and are symmetrically staggered with respect to the arc-shaped groove. When the grain enters the silo, it will squeeze the original air in the silo, causing the air to be discharged. And the friction between the grain and the air during the falling process will also generate a certain amount of heat. Especially at a relatively fast falling speed, the arrangement of the channels enables the air in the silo to be shunted when entering from the arc-shaped groove.

[0017] Preferably, the channel is in a bent shape and includes a straight groove and a bent groove. The two groups of straight grooves expand outward and are inclined with respect to both sides of the arc-shaped groove. When the air flows out of the bent groove, it will collide with the air entering from the arc-shaped groove, thereby hindering the air in the silo from entering the exhaust pipe. More air is discharged from the heat dissipation strips, maintaining the stability in the exhaust pipe, preventing the air from flowing back into the cooler, reducing the wear of the cooler, and the cold air can maintain its speed or even be accelerated when passing through the channel and entering the silo.

[0018] Preferably, arc-shaped plates are arranged in the two groups of channels. The edges of the two groups of arc-shaped plates are all located in the arc-shaped groove. When the air in the silo enters the arc-shaped groove, it will be blocked by the arc-shaped plates, and most of the air will enter the bent groove, hindering the air in the silo from entering the exhaust pipe.

[0019] Preferably, a fillet is arranged at the connection between the straight groove and the bent groove, making the air move more smoothly in the bent groove.

[0020] Preferably, multiple inner rings are arranged on the inner edge of the exhaust pipe, and the multiple inner rings are arranged at the upper edge of the arc-shaped groove. When the cold air enters the exhaust pipe, the cold air will be blocked by the bottom of the inner ring and enter the arc-shaped groove, enabling the cold air to flow evenly into the silo from the arc-shaped groove, and the shape of the inner ring can stabilize the flow of the cold air and prevent the flow from being disordered.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. To address the phenomenon of "hot skin and cold core" that easily occurs in metal-structured granaries under high summer temperatures, that is, after the metal silo wall absorbs heat, a temperature difference is formed with the low temperature inside the silo, resulting in the grain near the silo wall condensing and dew forming due to the temperature difference. The present invention forms a spiral channel by setting a partition between the silo wall and the grain pile and opening annular grooves on the partition. This design enables the cold air released by the cooler to fill into this annular groove after cooling the grain pile, reducing the temperature difference between the silo wall after absorbing heat and the grain, thereby preventing the problem of dew formation on the sidewall grain due to the temperature difference. Moreover, the present invention improves the traditional longitudinal ventilation method to transverse ventilation by optimizing the flow path of cold air, shortening the flow path of air inside the silo, and improving the cooling efficiency of the granary.

[0023] 2. When the grain cooler releases cold air, a part of the cold air will also be diverted into the annular groove. The cold air enters the annular groove path and rotates upward to the top of the silo and flows out from the exhaust hole. During this process, the air flow in the annular groove generates negative pressure inside the granary, causing each group of cold air discharged from the arc-shaped groove to horizontally pass through the granary to the heat dissipation strips. In this way, precise local ventilation can be achieved with fewer ventilation dead corners. Therefore, after the ventilation ends, the temperature uniformity of each part of the grain pile is significantly improved.

[0024] 3. The present invention effectively slows down the falling speed of the grain and reduces the impact on the bottom of the silo by introducing an exhaust pipe in the grain falling path, thereby reducing the risk of grain breakage. At the same time, during the grain discharging process, the grain will be automatically classified. The presence of the exhaust pipe helps to disrupt this natural falling pattern, enabling the grain to disperse onto the inclined sidewall of the partition when falling, reducing the classification phenomenon caused by gravity and air resistance, and promoting a more uniform distribution of the grain. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a temperature and humidity modulation device for a low-temperature fresh-keeping metal granary of the present invention;

[0026] Figure 2 It is a cross-sectional view of a temperature and humidity modulation device for a low-temperature fresh-keeping metal granary of the present invention;

[0027] Figure 3 For the present invention Figure 2 Another perspective structural diagram;

[0028] Figure 4 It is a schematic structural diagram of the air inlet pipe of the present invention;

[0029] Figure 5 For the present invention Figure 3 Enlarged view of part A of the present invention and schematic diagram of the path of air inside the cylinder entering the exhaust pipe;

[0030] Figure 6Schematic structural diagram of the channel of the present invention;

[0031] Figure 7 Schematic diagram of the ventilation of a metal granary in the prior art of the present invention;

[0032] Figure 8 Schematic diagram of the air inlet and outlet paths of the cooler of the present invention;

[0033] In the figure: 1, conveying pipe; 2, silo; 3, cooler; 4, intake pipe; 5, exhaust pipe; 6, arc groove; 7, partition; 8, heat dissipation strip; 9, exhaust hole; 10, ring groove; 11, groove; 12, bump; 13, channel; 131, straight groove; 132, bent groove; 133, arc plate; 134, fillet; 14, inner ring. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1 , Figure 2 and Figure 8 , a temperature and humidity modulation device for a low-temperature fresh-keeping metal granary. The granary includes a conveying pipe 1, a silo 2 provided at the bottom of the conveying pipe 1, a cooler 3 provided on one side of the silo 2, and an intake pipe 4 opened at the bottom of the silo 2. The cooler 3 is communicated with the intake pipe 4. The temperature and humidity modulation device includes an exhaust pipe 5, multiple layers of arc grooves 6, a partition 7, heat dissipation strips 8, exhaust holes 9, a ring groove 10 and a groove 11; the exhaust pipe 5 is provided at the central position inside the silo 2, and the cold air discharged from the cooler 3 enters the silo 2 through the exhaust pipe 5. Multiple layers of arc grooves 6 are opened on the exhaust pipe 5, and the multiple layers of arc grooves 6 are spirally opened on the outer surface of the exhaust pipe 5. The partition 7 is provided on the inner side wall of the silo 2, and a ring groove 10 is opened between the partition 7 and the silo 2. The ring groove 10 is communicated with the intake pipe 4 through the groove 11. The cold air discharged from the cooler 3 enters the ring groove 10 and the arc groove 6 respectively. Multiple groups of heat dissipation strips 8 are arranged, and the heat dissipation strips 8 are spirally arrayed on the side wall of the partition 7, and the heat dissipation strips 8 correspond layer by layer to the multiple layers of arc grooves 6. Multiple groups of exhaust holes 9 are provided and opened at the top of the silo 2.

[0036] It can be seen that the granary with a metal structure is vulnerable to the influence of high summer temperatures. Grain is a poor conductor of heat, and heat transfer is slow. When the external temperature is higher than the grain temperature, a situation of "hot skin and cold core" will occur. Therefore, the grain near the metal bin wall is prone to condensation when encountering the relatively hot wall, and it is easy to cause the grain near the side wall of the granary to dew, heat up, and mildew, affecting the safety and nutritional value of the grain. When this situation occurs, it may lead to the grain on the inner side wall of the grain pile to dew, heat up, and mildew, affecting the safety and nutritional value of the grain. In the present invention, a partition 7 is provided between the bin wall and the granary, and a spiral channel 13 is formed between the bin wall and the partition 7 by opening an annular groove 10. The cold air released by the cooler 3 is filled into the annular groove 10 after cooling the grain pile. The cold air is mixed with the temperature on the bin wall, reducing the temperature difference between the bin wall after absorbing heat and the grain, and at the same time can also cool the grain in contact with the side wall of the silo 2, effectively preventing the grain from dewing due to the temperature difference. Moreover, when the cold air released by the cooler 3 cools the grain pile, the exhaust pipe 5 can change the moving direction of the cold air, which can also improve the efficiency of temperature reduction and humidity adjustment, remove the water vapor on the bin wall, and make the airflow more evenly distributed in the granary, achieving the same temperature reduction effect in a shorter time and higher efficiency.

[0037] In addition, due to the position of the arc-shaped groove 6, the cold air from the exhaust pipe 5 moves horizontally to the partition 7. The horizontal ventilation path is shorter than the vertical one, the unit ventilation resistance is small, and there are fewer ventilation dead corners. Therefore, after ventilation, the temperature uniformity at each part of the grain pile is significantly improved.

[0038] As an implementation manner of the present invention, referring to Figure 2 , the side wall of the partition 7 is in an inclined state, and the cross-section of the annular groove 10 is narrower at the top and wider at the bottom. The heat absorbed by the ground will be transferred to the air in contact with the ground through heat conduction, making the air temperature near the ground rise. Thus, more cold air can be gathered at the bottom of the annular groove 10 for cooling compared to the upper part. In addition, when the grain is discharged, it can smoothly reach the bottom along the inclined surface of the partition 7, reducing the impact during grain discharging.

[0039] As an implementation manner of the present invention, referring to Figure 2 and Figure 3 , the annular groove 10 is spiral and is evenly distributed along the vertical direction of the silo 2. Multiple heat dissipation strips 8 are adapted to the number of spiral turns and the spiral angle of the annular groove 10. The starting end of the annular groove 10 is located at the bottom of the silo 2, and the end is located above the silo 2. When the cold air penetrates into the grain pile and enters the annular groove 10, the air will gather in the annular groove 10 and flow along the shape of the annular groove 10, fully contacting and cooling the inner side wall of the silo 2 while also taking away the water vapor on it.

[0040] As an implementation manner of the present invention, referring to Figure 3 , the groove 11 penetrates through the annular groove 10 and the partition 7, and the exhaust hole 9 is connected to the annular groove 10.

[0041] As an embodiment of the present invention, referring to Figure 4 and Figure 6 , a convex block 12 is provided below the arc-shaped groove 6. The convex block 12 and the edge of the arc-shaped groove 6 form an inclined surface, and the inclination angle of the inclined surface gradually increases from the edge of the arc-shaped groove 6 to the convex block 12. By installing an exhaust pipe 5 at the bottom of the blanking port, the grains will first contact the exhaust pipe 5 during the falling process, which can slow down the falling speed of the grains and reduce the direct impact on the bottom of the bin, thereby effectively reducing the possibility of grain breakage. Moreover, during the blanking process of the grains, due to differences in particle size, plumpness, water content, etc., automatic classification is likely to occur. The setting of the exhaust pipe 5 helps to disrupt the natural falling trajectory of the grains. When the grains fall, they will be dispersed to the inclined side walls of the partition plate 7, reducing the classification caused by gravity and air resistance, and making the grain distribution more uniform. The inclined surface formed by the convex block 12 and the edge of the arc-shaped groove 6 can prevent the grains from entering the arc-shaped groove 6.

[0042] As an embodiment of the present invention, referring to Figure 6 , a channel 13 is further opened in the arc-shaped groove 6. There are two groups of channels 13, and the two groups of channels 13 are arranged on both sides of the arc-shaped groove 6 and are symmetrically staggered with respect to the arc-shaped groove 6. When the grains enter the silo 2, they will squeeze the original air in the bin, causing the air to be discharged. Moreover, the friction between the grains and the air during the falling process will also generate a certain amount of heat, especially at a relatively fast falling speed. The setting of the channel 13 causes the air in the bin to be shunted when entering from the arc-shaped groove 6.

[0043] As an embodiment of the present invention, referring to Figure 5 , Figure 6 , the channel 13 is in a bent shape and includes a straight groove 131 and a bent groove 132. The two groups of straight grooves 131 expand outward and are inclined with respect to both sides of the arc-shaped groove 6. The inclination angle of the straight groove 131 is the same as the direction of the air in the silo 2 entering the arc-shaped groove 6. When the air in the granary enters from the straight groove 131, the air flowing in the bent groove 132 will collide with the air entering the arc-shaped groove 6 again when entering the arc-shaped groove 6, thereby hindering the air in the silo 2 from entering the exhaust pipe 5. More air is discharged from the heat dissipation strips 8, maintaining the stability in the exhaust pipe 5 and preventing the air from flowing back into the cooler 3, reducing the wear on the cooler 3. In addition, when the cold air is discharged outward from the arc-shaped groove 6, the cold air flowing through the first bent groove 132 does not need to detour anymore, but is a straight pipe. The shunted cold air will continue to converge, almost forming a straight line without obstruction, and then move forward repeatedly. This design enables the cold air to maintain its speed or even accelerate when entering the silo 2.

[0044] As an embodiment of the present invention, referring to Figure 1, arc-shaped plates 133 are arranged in two groups of channels 13. The edges of the two groups of arc-shaped plates 133 are both located in the arc-shaped grooves 6. When the air in the silo 2 enters the arc-shaped grooves 6, it will be blocked by the arc-shaped plates 133, and most of the air will enter the bent grooves 132, creating an obstruction to the air in the silo 2 entering the exhaust pipe 5.

[0045] As an implementation manner of the present invention, referring to Figure 6 , a fillet 134 is provided at the connection between the straight groove 131 and the bent groove 132, making the air move more smoothly in the bent groove 132.

[0046] As an implementation manner of the present invention, referring to Figure 6 , multiple groups of inner rings 14 are provided on the inner edge of the exhaust pipe 5, and the multiple groups of inner rings 14 are arranged at the upper edge of the arc-shaped groove 6. When the cold air enters the exhaust pipe 5, the cold air will be blocked by the bottom of the inner ring 14 and enter the arc-shaped groove 6, so that the cold air evenly flows into the silo 2 from the arc-shaped groove 6, and the shape of the inner ring 14 can stabilize the flow of the cold air and prevent the flow from being disordered.

[0047] Working principle: When the grain enters the silo 2 through the conveying pipe 1, the grain will first contact the exhaust pipe 5 during the falling process, which can slow down the falling speed of the grain and reduce the direct impact on the bottom of the bin, thereby effectively reducing the possibility of grain breakage. And during the feeding process of the grain, due to differences in particle size, plumpness, moisture content, etc., an automatic grading phenomenon is likely to occur. The setting of the exhaust pipe 5 helps to disrupt the natural falling trajectory of the grain. When the grain falls, it will be scattered to the inclined side walls of the partition plate 7, reducing the grading caused by gravity and air resistance, making the grain distribution more uniform; when the grain falls and fills the granary, temperature control of the granary is required. Especially in summer when the external temperature is higher than the grain temperature, the grain near the metal bin wall is prone to condensation when encountering the relatively hot wall. When the external temperature is higher than the grain temperature, it will cause the situation of "hot skin and cold core". Therefore, the grain near the metal bin wall is prone to condensation when encountering the relatively hot wall, and it is easy to cause the grain near the side wall of the granary to dew, heat up, and mildew, affecting the safety and nutritional value of the grain. The present invention sets a partition plate 7 between the bin wall and the granary, and opens an annular groove 10 between the two. By opening the annular groove 10, a spiral channel 13 is generated between the bin wall and the partition plate 7. The cold air released by the cooler 3 enters the annular groove 10 after cooling the grain pile. At this time, the cold air is mixed with the temperature on the bin wall, which can reduce the temperature difference between the bin wall after absorbing heat and the grain, and at the same time can cool the grain in contact with the side wall of the silo 2, effectively preventing the grain from dewing due to the temperature difference;

[0048] When the cold air enters the silo 2 through the exhaust pipe 5, the present invention optimizes the flow path of the cold air, improving the traditional longitudinal ventilation method to transverse ventilation, referring to Figure 7Due to the position of the arc-shaped groove 6, the discharged cold air moves horizontally to the partition plate 7. The horizontal ventilation path is shorter than the vertical one, with a smaller unit ventilation resistance and fewer ventilation dead corners. Therefore, after the ventilation is completed, the temperature uniformity of each part of the grain pile is significantly improved;

[0049] It should be noted that when the grain cooler 3 releases cold air, a part of the cold air will also be diverted into the annular groove 10. The cold air enters the annular groove 10 and then rotates and rises to the top of the silo 2 and flows out from the exhaust hole 9. During this process, the flow velocity of the annular groove 10 will be greater than that of the cold air in the silo 2 because there is no obstruction from the grain. Thus, when the air flows in the annular groove 10, a negative pressure is generated in the granary, and the negative pressure generates a suction force on the cold air blown out from the arc-shaped groove 6, so that each horizontal air flow will pass through the heat dissipation strips 8, and the number of turns and intervals of the heat dissipation strips 8 correspond to those of the annular groove 10 one by one. In this way, after the cold air is horizontally discharged from the arc-shaped groove 6, it is accelerated through the heat dissipation strips 8 by the negative pressure and enters the annular groove 10 to flow. At this time, the cold air moving upward in the annular groove 10 can not only take away the high temperature of the silo wall, remove the water vapor on the silo wall, but also accelerate the cooling speed. Moreover, due to the shorter horizontal ventilation path, smaller unit ventilation resistance and fewer ventilation dead corners, after the ventilation is completed, the temperature uniformity of each part of the grain pile is significantly improved.

[0050] In addition, the friction between the grain and the air during the falling process will also generate a certain amount of heat, especially at a relatively fast falling speed. The present invention is provided with a channel 13. The setting of the channel 13 causes the air in the silo to be diverted when entering from the arc-shaped groove 6 due to the obstruction of the arc-shaped plate 133. When the air at the entrance part of the arc-shaped groove 6 enters from the straight groove 131, the air flowing in the bent groove 132 enters the arc-shaped groove 6 again, and at this time, it will collide with the air entering the arc-shaped groove 6, thus obstructing the air in the silo from entering the exhaust pipe 5. The air in the silo can only slowly enter the arc-shaped groove 6, which promotes more air to be discharged from the heat dissipation strips 8 and the exhaust hole 9, reduces the air from flowing back into the cooler 3 through the exhaust pipe 5, and reduces the wear of the cooler 3. In addition, when the cold air is discharged outward from the arc-shaped groove 6, it will not be affected by the resistance of the bent groove 132, so it will be discharged extremely smoothly. This design enables the cold air to maintain its speed or even be accelerated when entering the silo 2, so as to achieve the advantage that it is difficult for the air in the silo to enter the exhaust pipe 5 while it is easy for the cold air to be discharged from the exhaust pipe 5.

[0051] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A temperature and humidity modulation device for a low-temperature fresh-keeping metal granary, the granary comprising a conveying pipe (1), a silo (2) arranged at the bottom of the conveying pipe (1), a cooler (3) arranged at one side of the silo (2), and an air inlet pipe (4) opened at the bottom of the silo (2), wherein the cooler (3) is connected to the air inlet pipe (4), and characterized in that: The temperature and humidity modulation device comprises an exhaust pipe (5), a multi-layer arc groove (6), a partition (7), a heat dissipation strip (8), an exhaust hole (9), an annular groove (10) and a groove (11); the exhaust pipe (5) is arranged at the central position inside the silo (2); the cold air discharged from the cooling machine (3) enters the silo (2) through the exhaust pipe (5); the multi-layer arc groove (6) is arranged on the exhaust pipe (5), and the multi-layer arc groove (6) is spirally arranged on the outer surface of the exhaust pipe (5); the partition (7) is arranged on the inner side wall of the silo (2); the partition (9) is arranged on the inner side wall of the silo (2); An annular groove (10) is provided between the plate (7) and the silo (2), the groove (11) is provided above the air inlet pipe (4), the annular groove (10) is connected to the air inlet pipe (4) through the groove (11), the cold air discharged by the cooler (3) enters the annular groove (10) and the arc groove (6) respectively, the heat dissipation strips (8) are arranged in a plurality of groups, the heat dissipation strips (8) are arranged in a spiral array on the side wall of the partition plate (7), and the heat dissipation strips (8) correspond to the plurality of layers of the arc grooves (6) layer by layer, the exhaust holes (9) are provided in a plurality of groups, and are provided on the top of the silo (2); The side wall of the partition (7) is in an inclined state, and the cross section of the annular groove (10) is narrow at the top and wide at the bottom; The annular groove (10) is spiral-shaped and evenly distributed along the vertical direction of the silo (2). The plurality of groups of heat dissipation strips (8) are adapted to the spiral turns and spiral angle of the annular groove (10). The starting end of the annular groove (10) is located at the bottom of the silo (2), and the end end is located above the silo (2). The groove (11) penetrates the annular groove (10) and the partition plate (7), and the exhaust hole (9) is connected to the annular groove (10); A convex block (12) is provided below the arc-shaped groove (6), the convex block (12) and the edge of the arc-shaped groove (6) form an inclined surface, and the inclined surface gradually increases in inclination angle from the edge of the arc-shaped groove (6) to the convex block (12); A channel (13) is also provided in the arc-shaped groove (6), and two groups of the channels (13) are provided. The two groups of the channels (13) are provided on both sides of the arc-shaped groove (6) and are symmetrically staggered with the arc-shaped groove (6); The channel (13) is bent, and comprises a straight groove (131) and a curved groove (132), and the two groups of straight grooves (131) are expanded outwards and inclined relative to the two sides of the arc-shaped groove (6); The two groups of channels (13) are provided with arc-shaped plates (133), and the edges of the two groups of arc-shaped plates (133) are both located in the arc-shaped grooves (6); A rounded corner (134) is provided at the connection between the straight groove (131) and the curved groove (132).

2. The temperature and humidity modulation device for a low-temperature fresh-keeping metal granary according to claim 1, characterized in that: The inner edge of the exhaust pipe (5) is provided with a plurality of groups of inner rings (14), and the plurality of groups of inner rings (14) are arranged at the upper edge of the arc-shaped groove (6).

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