Corn drying system

Abstract

The utility model discloses a corn drying system which comprises a drying tower and a heat pump set air conditioning device, the drying tower is sequentially provided with a feeding port, a grain storage section, a drying section, a cooling section, a grain discharging section and a discharging port from top to bottom, the heat pump set air conditioning device comprises a shell, a heat pump set is arranged in the shell, and the shell is provided with an air outlet, an air return port and an air exhaust port. The air outlet and the air return opening are connected to the drying section through a drying air inlet pipeline and a drying air return pipeline respectively, a cooling air inlet pipeline and a cooling air return pipeline are connected to the cooling section of the drying tower, the end, away from the drying tower, of the cooling air return pipeline is connected to the air inlet side of the condenser, and the air outlet is formed in a shell on the air outlet side of the evaporator. The utility model aims to provide the corn drying system which can continuously dry corns, and is energy-saving, environment-friendly and high in efficiency.

Description

Technical Field

[0001] The utility model relates to the field of grain drying, in particular to a system for drying corn. Background Art

[0002] At present, the scale of agriculture and the degree of production mechanization in China are getting higher and higher, and the production capacity has increased. Using traditional natural sun drying to dry grains has low efficiency, high labor intensity, and serious waste. Only by using mechanical drying to reduce the moisture content of grains can the problem of timely drying of grains after harvesting be solved, losses be avoided and reduced, the quality of grains be maintained, and the economic benefits of agricultural production be improved.

[0003] When corn is harvested, its moisture content is about 20% - 35%. If it is not dried in time, it will surely cause mildew and deterioration. At present, agricultural drying equipment still mainly uses hot air drying, mainly including circulating dryers and continuous dryers. Their hot blast stoves provide hot air at 70 - 170°C to dry corn for different uses: the heating temperature of edible corn should be ≤50°C, the heating temperature of corn for starch and fermentation industries should be ≤55°C, the heating temperature of corn for feed should be ≤60°C, and the heating temperature of corn for seeds should be ≤43°C.

[0004] The traditional use of coal as an energy source for production and domestic heating has been gradually replaced by clean energy. Therefore, the hot blast stoves of current agricultural drying equipment mainly use fuel oil and natural gas as fuels. The use of clean energy protects the environment, but to a certain extent, it also increases the production cost of agriculture.

[0005] A heat pump is a high-efficiency heating technology that uses external work to convert low-level heat sources into high-level heat sources. By consuming a small amount of electric energy, a large amount of heat energy can be obtained. It has the advantages of environmental protection and energy conservation, and meets the requirements of green development. Therefore, in recent years, heat pump technology has attracted more and more attention from scientific research organizations, and air-source heat pump grain dryers have also been increasingly promoted and applied in the main grain-producing areas in the south. However, for the large demand for corn drying in the northern agricultural production areas, there is still no mature technology and equipment. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a corn drying system that can continuously dry corn, is energy-saving, environment-friendly and has high efficiency.

[0007] The corn drying system of the present utility model includes a drying tower and a heat pump unit air conditioning device. The drying tower is a cylindrical structure arranged vertically. The outer cylindrical wall of the drying tower is covered with a heat preservation layer, and a metal protective layer is provided outside the heat preservation layer. The drying tower is successively provided with a feed inlet, a grain storage section, a drying section, a cooling section, a grain discharging section and a discharge outlet from top to bottom. The heat pump unit air conditioning device includes a housing, a heat pump unit is provided inside the housing, and an air outlet, a return air port and an exhaust port are provided on the housing. The air outlet is connected to the drying section of the drying tower through a drying air inlet pipeline, the return air port is connected to the drying section of the drying tower through a drying return air pipeline, and a circulating ventilator is connected to the drying air inlet pipeline or the drying return air pipeline. A cooling air inlet pipeline and a cooling return air pipeline are connected to the cooling section of the drying tower, and a cooling fan is connected to the cooling air inlet pipeline or the cooling return air pipeline. The end of the cooling return air pipeline far away from the drying tower is connected to the air inlet side of the condenser of the heat pump unit, and the exhaust port is arranged on the housing of the air outlet side of the evaporator of the heat pump unit.

[0008] The corn drying system of the present utility model, wherein a first dust removal chamber, an air inlet chamber, a constant pressure chamber, a mixed air chamber and an air outlet chamber which are successively communicated are provided inside the housing. The return air port is provided on the housing of the first dust removal chamber, and a first dust removal device is provided inside the first dust removal chamber. The return air port is communicated with the inlet of the first dust removal device. The first dust removal chamber and the air inlet chamber are communicated through a first ventilation port, the air inlet chamber and the constant pressure chamber are communicated through a second ventilation port, and the evaporator of the heat pump unit is provided on the second ventilation port. The compressor of the heat pump unit is provided inside the constant pressure chamber, and the exhaust port is provided on the housing of the constant pressure chamber. The constant pressure chamber and the mixed air chamber are communicated through a third ventilation port, the mixed air chamber and the air outlet chamber are communicated through a fourth ventilation port, and the condenser of the heat pump unit is provided on the fourth ventilation port. The air outlet is provided on the housing of the air outlet chamber.

[0009] The corn drying system of the present utility model, wherein an intermediate air duct communicating the first dust removal chamber and the mixed air chamber is further provided inside the housing. The two ends of the intermediate air duct are respectively a first port and a second port. The first port is located inside the first dust removal chamber, and the second port is located inside the mixed air chamber. A first air door is hinged inside the first dust removal chamber, and a second air door is hinged inside the mixed air chamber. When the first air door rotates, it can close the first ventilation port or the first port. When the second air door rotates, it can close the third ventilation port or the second port. An air inlet door is provided on the housing of the air inlet chamber, and an axial flow fan is installed on the exhaust port.

[0010] The corn drying system of the utility model, wherein the cooling return air pipeline comprises a first sub-cooling return air pipeline and a second sub-cooling return air pipeline. One end of the first sub-cooling return air pipeline is connected to the cooling section of the drying tower, and the other end of the first sub-cooling return air pipeline is communicated with the inlet of the second dust removal chamber. A second dust removal device is arranged in the second dust removal chamber, and the inlet of the second dust removal device is communicated with the inlet of the second dust removal chamber. The outlet of the second dust removal chamber is connected to one end of the second sub-cooling return air pipeline, and a pressure stabilizing air door is connected to the other end of the second sub-cooling return air pipeline. A make-up air pipe is connected between the second sub-cooling return air pipeline and the air mixing chamber of the housing, and an electric air door is connected to the make-up air pipe.

[0011] The corn drying system of the utility model, wherein the drying section includes a first-stage heating section, a first-stage tempering section, a second-stage heating section, a second-stage tempering section, a third-stage heating section and a third-stage tempering section arranged in sequence from top to bottom. The first-stage heating section is provided with a first-stage inlet air angled pipe, a first-stage return air angled pipe, a first-stage drying inlet air chamber and a first-stage drying outlet air chamber. The first-stage inlet air angled pipe and the first-stage return air angled pipe are both arranged in the drying tower. The first-stage drying inlet air chamber and the first-stage drying outlet air chamber are both arranged outside the drying tower. The first-stage inlet air angled pipe is located above the first-stage return air angled pipe. The first-stage inlet air angled pipe and the first-stage return air angled pipe are arranged perpendicular to each other. The first-stage inlet air angled pipe is communicated with the first-stage drying inlet air chamber. The first-stage return air angled pipe is communicated with the first-stage drying outlet air chamber. The second-stage heating section is provided with a second-stage inlet air angled pipe, a second-stage return air angled pipe, a second-stage drying inlet air chamber and a second-stage drying outlet air chamber. The second-stage inlet air angled pipe and the second-stage return air angled pipe are both arranged in the drying tower. The second-stage drying inlet air chamber and the second-stage drying outlet air chamber are both arranged outside the drying tower. The second-stage inlet air angled pipe is located above the second-stage return air angled pipe. The second-stage inlet air angled pipe and the second-stage return air angled pipe are arranged perpendicular to each other. The second-stage inlet air angled pipe is communicated with the second-stage drying inlet air chamber. The second-stage return air angled pipe is communicated with the second-stage drying outlet air chamber. The third-stage heating section is provided with a third-stage inlet air angled pipe, a third-stage return air angled pipe, a third-stage drying inlet air chamber and a third-stage drying outlet air chamber. The third-stage inlet air angled pipe and the third-stage return air angled pipe are both arranged in the drying tower. The third-stage drying inlet air chamber and the third-stage drying outlet air chamber are both arranged outside the drying tower. The third-stage inlet air angled pipe is located above the third-stage return air angled pipe. The third-stage inlet air angled pipe and the third-stage return air angled pipe are arranged perpendicular to each other. The third-stage inlet air angled pipe is communicated with the third-stage drying inlet air chamber. The third-stage return air angled pipe is communicated with the third-stage drying outlet air chamber. The heat pump unit air conditioning devices are set to three, and the three heat pump unit air conditioning devices are respectively a first-stage heat pump unit air conditioning device, a second-stage heat pump unit air conditioning device and a third-stage heat pump unit air conditioning device. The drying inlet air pipeline and the drying return air pipeline are both set to three. The three drying inlet air pipelines are respectively a first-stage drying inlet air pipeline, a second-stage drying inlet air pipeline and a third-stage drying inlet air pipeline. The three drying return air pipelines are respectively a first-stage drying return air pipeline, a second-stage drying return air pipeline and a third-stage drying return air pipeline. The circulating ventilators are set to three, and the three circulating ventilators are respectively a first-stage circulating ventilator, a second-stage circulating ventilator and a third-stage circulating ventilator. The housing air outlet of the first-stage heat pump unit air conditioning device is connected to the first-stage drying inlet air chamber through the first-stage drying inlet air pipeline. The housing air return port of the first-stage heat pump unit air conditioning device is connected to the first-stage drying outlet air chamber through the first-stage drying return air pipeline. The first-stage circulating ventilator is connected to the first-stage drying inlet air pipeline or the first-stage drying return air pipeline. The housing air outlet of the second-stage heat pump unit air conditioning device is connected to the second-stage drying inlet air chamber through the second-stage drying inlet air pipeline. The housing air return port of the second-stage heat pump unit air conditioning device is connected to the second-stage drying outlet air chamber through the second-stage drying return air pipeline.A secondary circulation ventilator is connected to the secondary drying air inlet pipeline or the secondary drying air return pipeline. The air outlet of the housing of the tertiary heat pump unit air conditioner is connected to the tertiary drying air inlet chamber through the tertiary drying air inlet pipeline, and the air return port of the housing of the tertiary heat pump unit air conditioner is connected to the tertiary drying air outlet chamber through the tertiary drying air return pipeline. A tertiary circulation ventilator is connected to the tertiary drying air inlet pipeline or the tertiary drying air return pipeline. The make-up air pipes are provided in three, namely a primary make-up air pipe, a secondary make-up air pipe and a tertiary make-up air pipe. The electric air dampers are provided in three, namely a primary electric air damper, a secondary electric air damper and a tertiary electric air damper. A primary make-up air pipe is connected between the second sub-cooling air return pipeline and the air mixing chamber of the housing of the primary heat pump unit air conditioner, and a primary electric air damper is connected to the primary make-up air pipe. A secondary make-up air pipe is connected between the second sub-cooling air return pipeline and the air mixing chamber of the housing of the secondary heat pump unit air conditioner, and a secondary electric air damper is connected to the secondary make-up air pipe. A tertiary make-up air pipe is connected between the second sub-cooling air return pipeline and the air mixing chamber of the housing of the tertiary heat pump unit air conditioner, and a tertiary electric air damper is connected to the tertiary make-up air pipe. A cooling air inlet angled pipe, a cooling air return angled pipe, a cooling air inlet chamber and a cooling air outlet chamber are provided on the cooling section. The cooling air inlet angled pipe and the cooling air return angled pipe are both arranged in the drying tower. The cooling air inlet chamber and the cooling air outlet chamber are both arranged outside the drying tower. The cooling air inlet angled pipe is located above the cooling air return angled pipe, and the cooling air inlet angled pipe and the cooling air return angled pipe are arranged perpendicular to each other. The cooling air inlet angled pipe is communicated with the cooling air inlet chamber, and the cooling air return angled pipe is communicated with the cooling air outlet chamber. The cooling air inlet chamber is connected to the cooling air inlet pipeline, and the cooling air outlet chamber is connected to one end of the first sub-cooling air return pipeline. A grain discharging device is provided on the grain discharging section.,

[0012] In the corn drying system of the present utility model, the primary tempering section, the secondary tempering section and the tertiary tempering section all include a upper cylinder body and a lower cylinder body which are fixedly connected. The upper cylinder body is located above the lower cylinder body. The shape of the upper cylinder body matches the shape of the inner cylinder wall of the drying tower. The upper cylinder body is fixedly arranged on the inner cylinder wall of the drying tower. The lower cylinder body is of a square cylinder structure. A plurality of horizontally arranged flow guiding columns are arranged in the cylinder cavity of the lower cylinder body. The plurality of flow guiding columns are parallel to each other and arranged at intervals.,

[0013] The corn drying system of the present utility model, wherein the flow guiding column comprises a hinge shaft, a first flow guiding plate and a second flow guiding plate. Both ends of the hinge shaft are fixedly connected to two relatively arranged inner cylinder walls of the lower cylinder body. The first flow guiding plate and the second flow guiding plate are both arranged in the vertical direction from top to bottom. The upper ends of the first flow guiding plate and the second flow guiding plate are both hinged to the hinge shaft. A telescopic device capable of adjusting the distance between them is connected between the first flow guiding plate and the second flow guiding plate. The first flow guiding plate and the second flow guiding plate are both detachably and fixedly connected to the two relatively arranged inner cylinder walls of the lower cylinder body. The first flow guiding plate and the second flow guiding plate together form an inverted V-shaped structure.

[0014] The corn drying system of the present utility model, wherein the flow guiding column comprises a hinge shaft, a first flow guiding plate and a second flow guiding plate. Both ends of the hinge shaft are fixedly connected to two relatively arranged inner cylinder walls of the lower cylinder body. The first flow guiding plate and the second flow guiding plate are both arranged in the vertical direction from top to bottom. The upper ends of the first flow guiding plate and the second flow guiding plate are both hinged to the hinge shaft. A telescopic device capable of adjusting the distance between them is connected between the first flow guiding plate and the second flow guiding plate. The first flow guiding plate and the second flow guiding plate together form an inverted V-shaped structure. An elastic support device is arranged below the flow guiding column. The elastic support device comprises a support plate abutted between the first flow guiding plate and the second flow guiding plate. The support plate is supported on the inner cylinder wall of the lower cylinder body by a spring.

[0015] The corn drying system of the present utility model, wherein the telescopic device comprises a first rod, a second rod and a ring buckle. Oppositely arranged first threaded holes and second threaded holes are provided on the ring wall of the ring buckle. One end of the first rod is threadedly connected to the first threaded hole, and the other end of the first rod is hinged to the first flow guiding plate. One end of the second rod is threadedly connected to the second threaded hole, and the other end of the second rod is hinged to the second flow guiding plate.

[0016] The difference between the corn drying system of the present utility model and the prior art lies in that the heat pump unit air conditioning device in the present utility model forms a drying medium (air) circulation system after being connected to the drying tower. When the drying medium flows through the drying tower, it can dry the materials (corn) therein. After that, when the drying medium flows through the heat pump unit of the heat pump unit air conditioning device, it can be dehumidified and heated. The dried and heated drying medium then flows back into the drying tower to dry the materials, and so on in a cycle. When the dried materials flow through the cooling section of the drying tower, outdoor air enters the cooling section through the cooling air inlet pipeline to cool the materials. After the air absorbs the heat of the materials and its temperature rises, the air then enters the condenser intake side of the heat pump unit of the heat pump unit air conditioning device through the cooling air return pipeline. After being heated by the condenser, it enters the drying tower together with the drying medium to dry the materials. There are two functions of passing the outdoor air through the cooling section and then into the heat pump unit air conditioning device (i.e., making up air for the drying medium circulation system): one is that it can recover the waste heat after the materials are dried and input it into the drying medium circulation system; the other is that if the drying medium circulation system is not made up air, as the drying operation progresses, the heat loss of the system is less than the input of the driving energy (the heat generated by the operation of the heat pump unit), which will make the temperature and humidity of the drying medium become larger and larger, and finally cause the heat pump unit to malfunction. To avoid this situation, the present utility model can make up air for the drying medium circulation system, that is, even after the outdoor air absorbs the waste heat after the materials are dried, its temperature and humidity are much lower than those of the drying medium. Therefore, by adjusting the makeup air volume, it can be ensured that the drying medium maintains a constant temperature and low humidity state when drying the materials, and in this way, the dehumidification amount of materials per unit energy consumption can also be increased. After making up air for the drying medium circulation system, the excess drying medium with relatively high temperature and humidity is discharged from the exhaust port to the outside air. It can be seen that the present utility model can continuously dry corn, with energy conservation, environmental protection and high efficiency.

[0017] The present utility model will be further described below with reference to the accompanying drawings. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the corn drying system of the present utility model;

[0019] Figure 2 It is a schematic structural diagram of the heat pump unit air conditioning device in the present utility model;

[0020] Figure 3 It is a three-dimensional view of the conditioning section in the present utility model;

[0021] Figure 4 It is a front view of the conditioning section in the present utility model;

[0022] Figure 5 It is a top view of the conditioning section in the present utility model;

[0023] Figure 6 is a cross-sectional view along Figure 5 the A-A line in ;

[0024] Figure 7 is a cross-sectional view along Figure 5 the B-B line in ;

[0025] Figure 8 is a top view of the flow guiding column in the present utility model;

[0026] Figure 9 is a cross-sectional view along Figure 8 the C-C line in ;

[0027] Figure 10 is Figure 9 a partial enlarged view at D in ;

[0028] Figure 11 is Figure 9 a partial enlarged view at E in ;

[0029] Figure 12 is a cross-sectional view along Figure 5 another cross-sectional view along the A-A line in ;

[0030] Figure 13 is Figure 12 a partial enlarged view at F in ;

[0031] Figure 14 is a cross-sectional view along Figure 5 another cross-sectional view along the B-B line in ;

[0032] Figure 15 is Figure 14 a partial enlarged view at G in . Detailed implementation manner

[0033] As Figure 1 shown, and in combination with Figure 2As shown in the figure, the corn drying system of the present utility model includes a drying tower 1 and a heat pump unit air conditioning device. The drying tower 1 is a cylindrical structure arranged vertically. The drying tower 1 is successively provided with a feed inlet, a grain storage section, a drying section, a cooling section, a grain discharging section and a discharge outlet from top to bottom. The heat pump unit air conditioning device includes a housing. A heat pump unit is provided inside the housing. An air outlet, a return air inlet and an exhaust outlet are provided on the housing. The air outlet is connected to the drying section of the drying tower 1 through a drying air inlet pipeline. The return air inlet is connected to the drying section of the drying tower 1 through a drying air return pipeline. A circulating ventilator is connected to the drying air inlet pipeline or the drying air return pipeline. A cooling air inlet pipeline 29 and a cooling air return pipeline are connected to the cooling section of the drying tower 1. A cooling fan 28 is connected to the cooling air inlet pipeline 29 or the cooling air return pipeline. The end of the cooling air return pipeline far from the drying tower 1 is connected to the intake side of the condenser 52 of the heat pump unit. The exhaust outlet is provided on the housing on the outlet side of the evaporator 45 of the heat pump unit.

[0034] The heat pump unit is a prior art, which includes a compressor 46, a condenser 52, an expansion valve 43 and an evaporator 45. The compressor 46, the condenser 52, the expansion valve 43 and the evaporator 45 are connected to each other to form a refrigeration loop. In the present utility model, the material (corn) is fed into the grain storage section from the feed inlet of the drying tower 1, and then flows downward successively, that is, through the drying section, the cooling section and the grain discharging section in sequence, and finally is discharged out of the drying tower 1 from the discharge outlet. The heat pump unit air conditioning device, the drying air inlet pipeline, the drying air return pipeline and the drying tower 1 together form a drying medium circulation system. Under the action of the circulating ventilator, the drying medium (air, used to dry the material) enters the drying section of the drying tower 1 from the heat pump unit air conditioning device through the drying air inlet pipeline, dries the material. After drying, the drying medium then flows back to the heat pump unit air conditioning device through the drying air return pipeline. Inside the housing of the heat pump unit air conditioning device, the drying medium is dehumidified and heated by the heat pump unit and then transported to the drying section of the drying tower 1 through the drying air inlet pipeline to dry the material, and so on in a cycle. That is to say, under the action of the circulating ventilator, the drying medium can circulate between the drying section of the drying tower 1 and the heat pump unit air conditioning device through the drying air inlet pipeline and the drying air return pipeline.

[0035] The specific process of dehumidifying and heating the drying medium by the heat pump unit is as follows: When the drying medium enters the housing of the heat pump unit air conditioning device from the drying section of the drying tower 1 through the drying air return pipeline, it first flows through the evaporator 45 of the heat pump unit. At this time, the refrigerant absorbs the heat of the drying medium and evaporates, and the water vapor inside the drying medium condenses and precipitates after releasing heat, so as to achieve the purpose of dehumidifying the drying medium. The dehumidified drying medium then flows through the condenser 52 of the heat pump unit. At this time, the refrigerant releases heat and condenses, and the drying medium absorbs the heat of the refrigerant, so as to achieve the purpose of heating the drying medium. The heated drying medium then enters the drying section of the drying tower 1 through the drying air inlet pipeline.

[0036] Under the action of the cooling fan 28, the outdoor air can enter the cooling section of the drying tower 1 through the cooling air inlet pipe 29 to cool the materials flowing through the cooling section, that is, the outdoor air absorbs the heat of the materials in the cooling section and enters the air inlet side of the heat pump unit condenser 52 in the heat pump unit air conditioning device shell through the cooling return air pipe. After being heated by the condenser 52, it enters the drying section of the drying tower 1 through the drying air inlet pipe together with the drying medium to dry the materials. Since the outdoor air is added to the drying medium circulation system, an exhaust port is opened on the air outlet side shell of the heat pump unit evaporator 45 of the heat pump unit air conditioning device, so that during the air supply process, the drying medium in the drying medium circulation system can be discharged to the outside from the exhaust port.

[0037] like Figure 1 , 2 As shown, the utility model corn drying system, wherein the shell is provided with a first dust removal chamber 38, an air inlet chamber 44, a constant pressure chamber 47, an air mixing chamber 53 and an air outlet chamber 54 which are connected in sequence, the shell of the first dust removal chamber 38 is provided with the return air port, the first dust removal chamber 38 is provided with a first dust removal device 57, the return air port is connected to the inlet of the first dust removal device 57, the first dust removal chamber 38 and the air inlet chamber 44 are connected through the first ventilation port 41, the air inlet chamber 44 and the constant pressure chamber 47 are connected. The two chambers are connected via a second vent, on which an evaporator 45 of a heat pump unit is disposed, in which a compressor 46 of a heat pump unit is disposed, and on a shell of the constant pressure chamber 47, the exhaust port is disposed, the constant pressure chamber 47 and an air mixing chamber 53 are connected via a third vent 49, the air mixing chamber 53 and an air outlet chamber 54 are connected via a fourth vent, on which a condenser 52 of a heat pump unit is disposed, and on a shell of the air outlet chamber 54, the air outlet is disposed.

[0038] The first dust removal device 57 is a prior art, and its specific structure and working principle are not described in detail. The first dust removal device 57 is arranged in the first dust removal chamber 38, and the inlet of the first dust removal device 57 can be connected with the return air port through a pipeline, or the inlet of the first dust removal device 57 can be directly installed on the return air port to achieve the connection between the two, as long as it can be ensured that the drying medium from the drying return air pipeline can enter the first dust removal device 57 through the return air port.

[0039] The flow direction of the drying medium inside the housing is as follows: The drying medium enters the first dust removal chamber 38 of the housing from the air return port and enters the first dust removal device 57 for dust removal. After that, the dried medium after dust removal enters the air inlet chamber 44 from the first dust removal chamber 38 through the first ventilation port 41. Then, it enters the constant pressure chamber 47 from the air inlet chamber 44 through the evaporator 45 on the second ventilation port (it can be seen from this that the air inlet chamber 44 is located on the intake side of the evaporator 45, and the constant pressure chamber 47 is located on the outlet side of the evaporator 45). Then, it enters the air mixing chamber 53 from the constant pressure chamber 47 through the third ventilation port 49, and then enters the air outlet chamber 54 from the air mixing chamber 53 through the condenser 52 on the fourth ventilation port (it can be seen from this that the air mixing chamber 53 is located on the intake side of the condenser 52, and the air outlet chamber 54 is located on the outlet side of the condenser 52). Finally, it is discharged from the air outlet of the air outlet chamber 54 out of the housing. When the drying medium flows through the evaporator 45, it undergoes a heat exchange with the refrigerant inside the evaporator 45, that is, the drying medium releases heat and the refrigerant absorbs heat and evaporates; when the drying medium flows through the condenser 52, it undergoes a heat exchange with the refrigerant inside the condenser 52, that is, the refrigerant releases heat and condenses, and the drying medium absorbs heat.

[0040] Since the constant pressure chamber 47 is located on the outlet side of the evaporator 45 and the exhaust port is provided on the housing of the constant pressure chamber 47, it can be considered that the exhaust port is provided on the outlet side housing of the evaporator 45 of the heat pump unit.

[0041] As Figure 1 、 2 As shown in the figure, for the corn drying system of the present invention, an intermediate air duct 55 communicating the first dust removal chamber 38 and the air mixing chamber 53 is further provided inside the housing. The two end ports of the intermediate air duct 55 are respectively a first port 39 and a second port 51. The first port 39 is located inside the first dust removal chamber 38, and the second port 51 is located inside the air mixing chamber 53. A first air damper 40 is hinged inside the first dust removal chamber 38, and a second air damper 50 is hinged inside the air mixing chamber 53. When the first air damper 40 rotates, it can close the first ventilation port 41 or the first port 39. When the second air damper 50 rotates, it can close the third ventilation port 49 or the second port 51. An air inlet damper 42 is provided on the housing of the air inlet chamber 44, and an axial flow fan 48 is installed on the exhaust port.

[0042] When the first air damper 40 closes the first ventilation port 41, the first port 39 is open. Conversely, when the first air damper 40 closes the first port 39, the first ventilation port 41 is open. When the second air damper 50 closes the third ventilation port 49, the second port 51 is open. Conversely, when the second air damper 50 closes the second port 51, the third ventilation port 49 is open.

[0043] In actual use, the first air damper 40 and the second air damper 50 can be designed as interlocking air dampers, that is, the motor 56 drives the first air damper 40 and the second air damper 50 to rotate simultaneously through a transmission device (such as a sprocket and a chain): when the motor 56 rotates forward, the first air damper 40 and the second air damper 50 can simultaneously close the first ventilation opening 41 and the third ventilation opening 49, and at this time, the first port 39 and the second port 51 are both open; conversely, when the motor 56 rotates in reverse, the first air damper 40 and the second air damper 50 can simultaneously close the first port 39 and the second port 51, and at this time, the first ventilation opening 41 and the third ventilation opening 49 are both open.

[0044] Inside the housing, the above-mentioned first dust removal chamber 38, air inlet chamber 44, constant pressure chamber 47, air mixing chamber 53, air outlet chamber 54 and intermediate air duct 55 are separated by a partition. In this embodiment, the housing is divided into upper and lower layers. The left side of the lower layer is the air inlet chamber 44, the right side of the lower layer is the constant pressure chamber 47, the left side of the upper layer is the first dust removal chamber 38, the middle part of the upper layer is further divided into an air outlet chamber 54 located above and an intermediate air duct 55 located below, and the right side of the upper layer is the air mixing chamber 53.

[0045] As Figure 1 , 2 shown, the corn drying system of the present invention, wherein the cooling return air pipeline includes a first sub-cooling return air pipeline 30 and a second sub-cooling return air pipeline 58. One end of the first sub-cooling return air pipeline 30 is connected to the cooling section of the drying tower 1, the other end of the first sub-cooling return air pipeline 30 is communicated with the inlet of the second dust removal chamber 31, a second dust removal device 37 is arranged in the second dust removal chamber 31, the inlet of the second dust removal device 37 is communicated with the inlet of the second dust removal chamber 31, the outlet of the second dust removal chamber 31 is connected to one end of the second sub-cooling return air pipeline 58, a voltage stabilizing air damper 65 is connected to the other end of the second sub-cooling return air pipeline 58, a make-up air pipe is connected between the second sub-cooling return air pipeline 58 and the air mixing chamber 53 of the housing, and an electric air damper is connected to the make-up air pipe.

[0046] Relative to the first sub-cooling return air pipeline 30, the second sub-cooling return air pipeline 58 is at the end of the cooling return air pipeline far from the drying tower 1. The second sub-cooling return air pipeline 58 is connected to the air mixing chamber 53 of the housing through a make-up air pipe. As described above, the air mixing chamber 53 is located on the air inlet side of the condenser 52, so it can be considered that the second sub-cooling return air pipeline 58 is connected to the air inlet side of the condenser 52 through a make-up air pipe, thus realizing the connection of the end of the cooling return air pipeline far from the drying tower 1 to the air inlet side of the condenser 52 of the heat pump unit.

[0047] The second dust removal device 37 is a prior art, and its specific structure and working principle will not be elaborated herein. The second dust removal device 37 is disposed in the second dust removal chamber 31. The inlet of the second dust removal device 37 can be communicated with the inlet of the second dust removal chamber 31 through a pipeline, or the inlet of the second dust removal device 37 can be directly installed on the inlet of the second dust removal chamber 31 to achieve the connection between the two, as long as it can ensure that the air coming from the first sub-cooled return air pipeline 30 can enter the second dust removal device 37 through the inlet of the second dust removal chamber 31.

[0048] Outdoor air enters the cooling section of the drying tower 1 through the cooling air inlet pipeline 29 to cool the material. After that, the cooled material descends into the grain discharging section, while the outdoor air with increased temperature enters the second dust removal chamber 31 through the first sub-cooled return air pipeline 30. After being dust-removed by the second dust removal device 37, it is then discharged to the outside through the pressure stabilizing air damper 65 on the second sub-cooled return air pipeline 58 at the outlet of the second dust removal chamber 31. The function of the pressure stabilizing air damper 65 is to keep the air pressure in the second sub-cooled return air pipeline 58 stable, that is, when the air pressure is too high, the opening of the pressure stabilizing air damper 65 becomes larger to reduce the air pressure; conversely, when the air pressure is too low, the opening of the pressure stabilizing air damper 65 becomes smaller to increase the air pressure. In this way, through the action of the pressure stabilizing air damper 65, the air pressure in the second sub-cooled return air pipeline 58 can always be maintained at the required value.

[0049] When it is necessary to supply air to the air mixing chamber 53 in the housing, just open the electric air damper. The air in the second sub-cooled return air pipeline 58 enters the intake side of the condenser 52 in the air mixing chamber 53 through the air supply pipeline, and then flows through the condenser 52 together with the drying medium and enters the air outlet chamber 54.

[0050] As Figure 1 、 2 shown, the corn drying system of the present invention, wherein the drying section includes a first-stage heating section, a first-stage tempering section, a second-stage heating section, a second-stage tempering section, a third-stage heating section, and a third-stage tempering section arranged in sequence from top to bottom.

[0051] When the material passes through the drying section, it sequentially passes through the first-stage heating section, the first-stage tempering section, the second-stage heating section, the second-stage tempering section, the third-stage heating section, and the third-stage tempering section from top to bottom.

[0052] On the first-stage heat supply section, there are a first-stage inlet air angled pipe 2, a first-stage return air angled pipe 3, a first-stage drying inlet air chamber 11, and a first-stage drying outlet air chamber 12. The first-stage inlet air angled pipe 2 and the first-stage return air angled pipe 3 are both arranged inside the drying tower 1, and the first-stage drying inlet air chamber 11 and the first-stage drying outlet air chamber 12 are both arranged outside the drying tower 1, specifically on the outer side wall of the drying tower 1. The first-stage inlet air angled pipe 2 is located above the first-stage return air angled pipe 3, the first-stage inlet air angled pipe 2 and the first-stage return air angled pipe 3 are arranged perpendicular to each other, the first-stage inlet air angled pipe 2 is communicated with the first-stage drying inlet air chamber 11, and the first-stage return air angled pipe 3 is communicated with the first-stage drying outlet air chamber 12.

[0053] On the second-stage heat supply section, there are a second-stage inlet air angled pipe 4, a second-stage return air angled pipe 5, a second-stage drying inlet air chamber 16, and a second-stage drying outlet air chamber 17. The second-stage inlet air angled pipe 4 and the second-stage return air angled pipe 5 are both arranged inside the drying tower 1, and the second-stage drying inlet air chamber 16 and the second-stage drying outlet air chamber 17 are both arranged outside the drying tower 1, specifically on the outer side wall of the drying tower 1. The second-stage inlet air angled pipe 4 is located above the second-stage return air angled pipe 5, the second-stage inlet air angled pipe 4 and the second-stage return air angled pipe 5 are arranged perpendicular to each other, the second-stage inlet air angled pipe 4 is communicated with the second-stage drying inlet air chamber 16, and the second-stage return air angled pipe 5 is communicated with the second-stage drying outlet air chamber 17.

[0054] On the third-stage heat supply section, there are a third-stage inlet air angled pipe 6, a third-stage return air angled pipe 7, a third-stage drying inlet air chamber 21, and a third-stage drying outlet air chamber 22. The third-stage inlet air angled pipe 6 and the third-stage return air angled pipe 7 are both arranged inside the drying tower 1, and the third-stage drying inlet air chamber 21 and the third-stage drying outlet air chamber 22 are both arranged outside the drying tower 1, specifically on the outer side wall of the drying tower 1. The third-stage inlet air angled pipe 6 is located above the third-stage return air angled pipe 7, the third-stage inlet air angled pipe 6 and the third-stage return air angled pipe 7 are arranged perpendicular to each other, the third-stage inlet air angled pipe 6 is communicated with the third-stage drying inlet air chamber 21, and the third-stage return air angled pipe 7 is communicated with the third-stage drying outlet air chamber 22.

[0055] There are three heat pump unit air conditioning devices, which are the first-stage heat pump unit air conditioning device 36, the second-stage heat pump unit air conditioning device 35, and the third-stage heat pump unit air conditioning device 34 respectively. Both the drying inlet air pipeline and the drying return air pipeline are set to three. The three drying inlet air pipelines are the first-stage drying inlet air pipeline 13, the second-stage drying inlet air pipeline 18, and the third-stage drying inlet air pipeline 24 respectively. The three drying return air pipelines are the first-stage drying return air pipeline 14, the second-stage drying return air pipeline 19, and the third-stage drying return air pipeline 23 respectively. There are three circulating ventilators, which are the first-stage circulating ventilator 15, the second-stage circulating ventilator 20, and the third-stage circulating ventilator 25 respectively.

[0056] The air outlet of the housing of the first-stage heat pump unit air conditioner 36 is connected to the first-stage drying air inlet chamber 11 through the first-stage drying air inlet pipeline 13, and the air return port of the housing of the first-stage heat pump unit air conditioner 36 is connected to the first-stage drying air outlet chamber 12 through the first-stage drying air return pipeline 14. A first-stage circulating ventilation fan 15 is connected to the first-stage drying air inlet pipeline 13 or the first-stage drying air return pipeline 14. The air outlet of the housing of the second-stage heat pump unit air conditioner 35 is connected to the second-stage drying air inlet chamber 16 through the second-stage drying air inlet pipeline 18, and the air return port of the housing of the second-stage heat pump unit air conditioner 35 is connected to the second-stage drying air outlet chamber 17 through the second-stage drying air return pipeline 19. A second-stage circulating ventilation fan 20 is connected to the second-stage drying air inlet pipeline 18 or the second-stage drying air return pipeline 19. The air outlet of the housing of the third-stage heat pump unit air conditioner 34 is connected to the third-stage drying air inlet chamber 21 through the third-stage drying air inlet pipeline 24, and the air return port of the housing of the third-stage heat pump unit air conditioner 34 is connected to the third-stage drying air outlet chamber 22 through the third-stage drying air return pipeline 23. A third-stage circulating ventilation fan 25 is connected to the third-stage drying air inlet pipeline 24 or the third-stage drying air return pipeline 23.

[0057] For the first-stage heating section, a plurality of first-stage air inlet angled pipes 2 located above are provided, and the plurality of first-stage air inlet angled pipes 2 are evenly spaced along the horizontal direction and are parallel to each other; a plurality of first-stage air return angled pipes 3 located below are also provided, and the plurality of first-stage air return angled pipes 3 are also evenly spaced along the horizontal direction and are also parallel to each other. The adjacent upper and lower first-stage air inlet angled pipes 2 and first-stage air return angled pipes 3 can be regarded as a set of first-stage air inlet and return angled pipes. As for how many sets of first-stage air inlet and return angled pipes are to be provided in the first-stage heating section, this can be determined according to the actual situation. When the material flows through the first-stage heating section from top to bottom, it flows through the gaps between two adjacent first-stage air inlet angled pipes 2 and the gaps between two adjacent first-stage air return angled pipes 3.

[0058] A first-stage drying medium circulation system is formed between the first-stage heat pump unit air conditioner 36 and the first-stage heating section of the drying tower 1 through the first-stage drying air inlet and return pipelines. Under the action of the first-stage circulating ventilation fan 15, the drying medium can circulate between the housing of the first-stage heat pump unit air conditioner 36 and the first-stage drying section of the drying tower 1.

[0059] The dry medium exiting from the housing air outlet of the primary heat pump unit air conditioner 36 enters the primary drying air inlet chamber 11 through the primary drying air inlet pipeline 13, then enters the primary air inlet angled pipe 2 from the primary drying air inlet chamber 11, and then blows out from the primary air inlet angled pipe 2. After that, the dry medium flows downward to the primary return air angled pipe 3 (the primary return air angled pipe 3 mentioned here belongs to the same group as the above-mentioned primary air inlet angled pipe 2). During this process, the dry medium dries the materials flowing through the primary air inlet angled pipe 2 and the primary return air angled pipe 3 from top to bottom. Then, the dry medium enters the primary return air angled pipe 3 and enters the primary drying air outlet chamber 12 through the primary return air angled pipe 3, and finally flows back into the housing of the primary heat pump unit air conditioner 36 from the primary drying air outlet chamber 12 through the primary drying return air pipeline 14, and so on in a cycle.

[0060] The structure of the secondary heat supply section is the same as that of the primary heat supply section. A secondary dry medium circulation system is formed between the secondary heat pump unit air conditioner 35 and the secondary heat supply section of the drying tower 1 through the secondary air inlet and return air pipelines. Under the action of the secondary circulation ventilator 20, the dry medium can circulate between the housing of the secondary heat pump unit air conditioner 35 and the secondary drying section of the drying tower 1. The structure and working principle of the secondary dry medium circulation system are the same as those of the primary dry medium circulation system, and will not be elaborated here.

[0061] The structure of the tertiary heat supply section is the same as that of the primary heat supply section. A tertiary dry medium circulation system is formed between the tertiary heat pump unit air conditioner 34 and the tertiary heat supply section of the drying tower 1 through the tertiary air inlet and return air pipelines. Under the action of the tertiary circulation ventilator 25, the dry medium can circulate between the housing of the tertiary heat pump unit air conditioner 34 and the tertiary drying section of the drying tower 1. The structure and working principle of the tertiary dry medium circulation system are the same as those of the primary dry medium circulation system, and will not be elaborated here.

[0062] There are three air supply supplement pipes, namely the primary air supply supplement pipe 63, the secondary air supply supplement pipe 61, and the tertiary air supply supplement pipe 59. There are three electric air dampers, namely the primary electric air damper 64, the secondary electric air damper 62, and the tertiary electric air damper 60. A primary air supply supplement pipe 63 is connected between the second divided cooling return air pipeline 58 and the air mixing chamber 53 of the housing of the primary heat pump unit air conditioner 36, and a primary electric air damper 64 is connected to the primary air supply supplement pipe 63; a secondary air supply supplement pipe 61 is connected between the second divided cooling return air pipeline 58 and the air mixing chamber 53 of the housing of the secondary heat pump unit air conditioner 35, and a secondary electric air damper 62 is connected to the secondary air supply supplement pipe 61; a tertiary air supply supplement pipe 59 is connected between the second divided cooling return air pipeline 58 and the air mixing chamber 53 of the housing of the tertiary heat pump unit air conditioner 34, and a tertiary electric air damper 60 is connected to the tertiary air supply supplement pipe 59.

[0063] When the first-stage electric air damper 64, the second-stage electric air damper 62, and the third-stage electric air damper 60 are opened respectively, the air in the second sub-cooling return air pipeline 58 can enter the air mixing chamber 53 of the housing of the first-stage heat pump unit air conditioning device 36, the air mixing chamber 53 of the housing of the second-stage heat pump unit air conditioning device 35, and the air mixing chamber 53 of the housing of the third-stage heat pump unit air conditioning device 34 respectively.

[0064] The cooling section is provided with a cooling air inlet angled pipe 8, a cooling air return angled pipe 9, a cooling air inlet chamber 26, and a cooling air outlet chamber 27. The cooling air inlet angled pipe 8 and the cooling air return angled pipe 9 are both arranged in the drying tower 1, and the cooling air inlet chamber 26 and the cooling air outlet chamber 27 are both arranged outside the drying tower 1, specifically on the outer side wall of the drying tower 1. The cooling air inlet angled pipe 8 is located above the cooling air return angled pipe 9, the cooling air inlet angled pipe 8 and the cooling air return angled pipe 9 are arranged perpendicular to each other, the cooling air inlet angled pipe 8 is communicated with the cooling air inlet chamber 26, and the cooling air return angled pipe 9 is communicated with the cooling air outlet chamber 27. The cooling air inlet chamber 26 is connected to the cooling air inlet pipeline 29, and one end of the cooling air outlet chamber 27 is connected to the first sub-cooling return air pipeline 30.

[0065] The structure of the cooling section is the same as that of the first-stage heating section. Under the action of the cooling fan 28, outdoor air enters the cooling air inlet chamber 26 through the cooling air inlet pipeline 29, and then enters the cooling air inlet angled pipe 8 from the cooling air inlet chamber 26, and then blows out from the cooling air inlet angled pipe 8. After that, the outdoor air flows downward to the cooling air return angled pipe 9 (the cooling air return angled pipe 9 mentioned here belongs to the same group as the above-mentioned cooling air inlet angled pipe 8). During this process, the outdoor air cools the material flowing from top to bottom through the cooling air inlet angled pipe 8 and the cooling air return angled pipe 9, that is, the outdoor air absorbs the heat of the material and reduces its temperature to the required value. Then, the outdoor air enters the cooling air return angled pipe 9, and enters the cooling air outlet chamber 27 through the cooling air return angled pipe 9, and then enters the first sub-cooling return air pipeline 30 from the cooling air outlet chamber 27, and then enters the second dust removal chamber 31 through the first sub-cooling return air pipeline 30 for dust removal, and then enters the second sub-cooling return air pipeline 58 from the second dust removal chamber 31.

[0066] The grain discharging section is provided with a grain discharger 10. The grain discharger 10 belongs to the prior art. When the grain discharger 10 is opened, the material in the grain discharging section can flow through the grain discharger 10 to the discharge port, and finally be discharged outside the drying tower 1 from the discharge port.

[0067] As Figure 3-11As shown, the corn drying system of the present utility model, wherein the first conditioning section, the second conditioning section and the third conditioning section all include an upper cylinder body 66 and a lower cylinder body 67 which are fixedly connected. The upper cylinder body 66 is located above the lower cylinder body 67. The shape of the upper cylinder body 66 matches the shape of the inner cylinder wall of the drying tower 1. The upper cylinder body 66 is fixedly arranged on the inner cylinder wall of the drying tower 1. The lower cylinder body 67 is a square cylinder structure. A plurality of horizontally arranged guide columns 69 are arranged in the cavity of the lower cylinder body 67. The plurality of guide columns 69 are parallel to each other and arranged at intervals.

[0068] The structures of the first conditioning section, the second conditioning section and the third conditioning section are the same. In this embodiment, the drying tower 1 is a cylindrical structure. Correspondingly, the upper cylinder body 66 is also a cylindrical structure, and the outer diameter of the upper cylinder body 66 is equal to the inner diameter of the drying tower 1.

[0069] The lower cylinder body 67 is a square cylinder structure, and the length of the inner diagonal of the lower cylinder body 67 is equal to the inner diameter of the upper cylinder body 66. In order to prevent materials from accumulating at the intersection of the inner cylinders of the upper cylinder body 66 and the lower cylinder body 67, a baffle plate 68 is provided between the inner cylinder wall of the upper barrel opening of the lower cylinder body 67 and the inner cylinder wall of the upper cylinder body 66. In this way, after the materials enter the upper cylinder body 66, they can enter the lower cylinder body 67 along the baffle plate 68. The baffle plate 68 is provided with 4 pieces, and the 4 baffle plates 68 are arranged corresponding to the 4 sides of the upper barrel opening of the lower cylinder body 67 one by one.

[0070] When the materials flow through the conditioning section, the materials first enter the upper cylinder body 66, then enter the lower cylinder body 67 downward, and flow out of the conditioning section from the gap between two adjacent guide columns 69.

[0071] Combined Figure 8-11 As shown, the corn drying system of the present utility model, wherein the guide column 69 includes a hinge shaft 72, a first guide plate 70 and a second guide plate 71. The two ends of the hinge shaft 72 are respectively fixedly connected to two relatively arranged inner cylinder walls of the lower cylinder body 67. The first guide plate 70 and the second guide plate 71 are both arranged in the up-down direction. The upper ends of the first guide plate 70 and the second guide plate 71 are both hinged to the hinge shaft 72. A telescopic device capable of adjusting the distance between each other is connected between the first guide plate 70 and the second guide plate 71. The first guide plate 70 and the second guide plate 71 are both detachably fixedly connected to the two relatively arranged inner cylinder walls of the lower cylinder body 67. The first guide plate 70 and the second guide plate 71 together form an inverted V-shaped structure.

[0072] Both the first deflector 70 and the second deflector 71 are rectangular plate-like structures. One long side end of the first deflector 70 and the second deflector 71 is the upper end, and the other long side end is the lower end. The long side ends of the two deflectors that serve as the upper ends are both hinged on the hinge shaft 72, and the long side ends that serve as the lower ends extend downward. It can be regarded that both deflectors are arranged in the direction from top to bottom. In this embodiment, the hinge shaft 72 is arranged horizontally, and the length directions of the two deflectors are consistent with the hinge shaft 72.

[0073] Both the upper ends of the first deflector 70 and the second deflector 71 are provided with hinge holes. The two deflectors are respectively sleeved on the hinge shaft 72 through their respective hinge holes, and there is a clearance fit between the hinge holes of the two deflectors and the hinge shaft 72. In this way, both deflectors can rotate around the hinge shaft 72 to achieve the hinge connection.

[0074] Since the upper ends of the first deflector 70 and the second deflector 71 are both hinged on the hinge shaft 72, that is to say, both the first deflector 70 and the second deflector 71 can rotate around the hinge shaft 72. Therefore, when the telescopic device adjusts the distance between the first deflector 70 and the second deflector 71, both the first deflector 70 and the second deflector 71 rotate around the hinge shaft 72. That is, when the distance between the first deflector 70 and the second deflector 71 is increased by the telescopic device, as Figure 9 shown, the first deflector 70 rotates around the hinge shaft 72 in a direction away from the second deflector 71, and the second deflector 71 rotates around the hinge shaft 72 in a direction away from the first deflector 70. Then the included angle γ between the two deflectors becomes larger; when the distance between the first deflector 70 and the second deflector 71 is decreased by the telescopic device, the first deflector 70 rotates around the hinge shaft 72 in a direction close to the second deflector 71, and the second deflector 71 rotates around the hinge shaft 72 in a direction close to the first deflector 70. Then the included angle γ between the two deflectors becomes smaller. To sum up, the telescopic device can adjust the distance between the first deflector 70 and the second deflector 71 to become larger or smaller, so that the included angle between the first deflector 70 and the second deflector 71 becomes larger or smaller.

[0075] After the telescopic device adjusts the distance between the first deflector 70 and the second deflector 71, both ends of each deflector are respectively detachably and fixedly connected to two relatively arranged inner cylinder walls of the lower cylinder body 67, and these two inner cylinder walls are also used to connect the hinge shaft 72. After both deflectors of each deflector column 69 are fixed to the inner cylinder wall of the lower cylinder body 67, both deflectors of each deflector column 69 are in an inverted V-shaped structure. In this way, the gap between two adjacent deflector columns 69 is a tapered gap with a larger upper part and a smaller lower part, which is convenient for the material to fall.

[0076] Combined with Figure 9 、 11As shown in the figure, the corn drying system of the present utility model, wherein the telescopic device includes a first rod 73, a second rod 75 and a ring buckle 74. Oppositely arranged first threaded holes and second threaded holes are provided on the wall of the ring buckle 74. One end of the first rod 73 is threadedly connected in the first threaded hole, and the other end of the first rod 73 is hinged to the first deflector 70. One end of the second rod 75 is threadedly connected in the second threaded hole, and the other end of the second rod 75 is hinged to the second deflector 71.

[0077] Hinge lugs 76 are provided on both the first deflector 70 and the second deflector 71. The other end of the first rod 73 is hinged to the hinge lug 76 of the first deflector 70, and the other end of the second rod 75 is hinged to the hinge lug 76 of the second deflector 71.

[0078] When it is necessary to increase the distance between the first deflector 70 and the second deflector 71, rotate the ring buckle 74 in the positive direction. The end of the first rod 73 connected to the ring buckle 74 moves from the inside to the outside of the ring buckle 74. At the same time, the end of the second rod 75 connected to the ring buckle 74 also moves from the inside to the outside of the ring buckle 74. Then the first rod 73 and the second rod 75 simultaneously push the two deflectors to rotate around the hinge shaft 72 outward, increasing the distance between the two deflectors (i.e., increasing the included angle γ between the two deflectors). During this process, the end of the first rod 73 hinged to the first deflector 70 rotates relative to the first deflector 70, decreasing the included angle α between the first rod 73 and the first deflector 70. At the same time, the end of the second rod 75 hinged to the second deflector 71 also rotates relative to the second deflector 71, decreasing the included angle β between the second rod 75 and the second deflector 71.

[0079] When it is necessary to decrease the distance between the first deflector 70 and the second deflector 71, rotate the ring buckle 74 in the reverse direction. The end of the first rod 73 connected to the ring buckle 74 moves from the outside to the inside of the ring buckle 74. At the same time, the end of the second rod 75 connected to the ring buckle 74 also moves from the outside to the inside of the ring buckle 74. Then the first rod 73 and the second rod 75 simultaneously pull the two deflectors to rotate around the hinge shaft 72 inward, decreasing the distance between the two deflectors (i.e., decreasing the included angle γ between the two deflectors). During this process, the end of the first rod 73 hinged to the first deflector 70 rotates relative to the first deflector 70, increasing the included angle α between the first rod 73 and the first deflector 70. At the same time, the end of the second rod 75 hinged to the second deflector 71 also rotates relative to the second deflector 71, increasing the included angle β between the second rod 75 and the second deflector 71.

[0080] The reason for adjusting the distance between the two deflector plates through the telescopic device is to adjust the gap size between two adjacent deflector columns 69. Specifically, when the distance between the two deflector plates of each deflector column 69 becomes larger, the gap between two adjacent deflector columns 69 will become smaller, which will make the material pass through the deflector column 69 for a longer time, that is, the time passing through the conditioning section becomes longer; on the contrary, when the distance between the two deflector plates of each deflector column 69 becomes smaller, the gap between two adjacent deflector columns 69 will become larger, which will make the material pass through the deflector column 69 for a shorter time, that is, the time passing through the conditioning section becomes shorter. All in all, by adjusting the distance between the two deflector plates of the deflector column 69 through the telescopic device, the time for the material to pass through the conditioning section can be adjusted.

[0081] When specifically installing the deflector column 69, the gap between two adjacent deflector columns 69 can be adjusted according to the actual situation to determine the time taken for the material to flow through the conditioning section. Then, the two deflector plates of each deflector column 69 can be detachably and fixedly connected to two relatively arranged inner cylinder walls of the lower cylinder body 67 through bolts. When specifically fixing the deflector plate on the inner cylinder wall of the lower cylinder body 67, fixing plates can be respectively fixedly connected to both ends of the deflector plate first, bolt holes are arranged on the fixing plates, and then the bolts are passed through the bolt holes and fixed on the inner cylinder wall of the lower cylinder body 67. Of course, bolts can also be respectively arranged on the inner and outer sides at one end of the deflector plate, and the bolts on both sides are fixed on one inner cylinder wall of the lower cylinder body 67. In this way, one end of the deflector plate is clamped between the bolts on the inner and outer sides. Then, the other end of the deflector plate is fixed on the other inner cylinder wall (this inner cylinder wall is relatively arranged with the above-mentioned one inner cylinder wall) of the lower cylinder body 67 by using the same method, so that the deflector plate is fixed on the inner cylinder wall of the lower cylinder body 67. After that, when it is necessary to adjust the gap between two adjacent deflector columns 69, the bolts are unscrewed, and then the distance between the two deflector plates of each deflector column 69 is adjusted through the telescopic device. After the gap between two adjacent deflector columns 69 is adjusted in place, the deflector column 69 can be detachably and fixedly connected to the inner cylinder wall of the lower cylinder body 67 through bolts.

[0082] Such as Figure 12-15As shown in the figure, the flow guiding column 69 in the present utility model can also adopt the following structure: The flow guiding column 69 includes a hinge shaft 72, a first flow guiding plate 70 and a second flow guiding plate 71. The two ends of the hinge shaft 72 are respectively fixedly connected to two relatively arranged inner cylinder walls of the lower cylinder body 67. The first flow guiding plate 70 and the second flow guiding plate 71 are both arranged in the up-down direction. The upper ends of the first flow guiding plate 70 and the second flow guiding plate 71 are both hinged to the hinge shaft 72. A telescopic device capable of adjusting the distance between each other is connected between the first flow guiding plate 70 and the second flow guiding plate 71. The first flow guiding plate 70 and the second flow guiding plate 71 together form an inverted V-shaped structure. An elastic support device is provided below the flow guiding column 69. The elastic support device includes a support plate 77 abutted between the first flow guiding plate 70 and the second flow guiding plate 71. The support plate 77 is supported on the inner cylinder wall of the lower cylinder body 67 by a spring 79.

[0083] Thus, it can be seen that Figure 12-15 The flow guiding column 69 shown Figure 8-11 differs from the flow guiding column 69 shown above Figure 12-15 in structure in that: An elastic support device is provided below the flow guiding column 69 shown, and the two flow guiding plates of the flow guiding column 69 are not fixedly connected to the inner cylinder wall of the lower cylinder body 67. Except for the above differences, Figure 12-15 the flow guiding column 69 shown Figure 8-11 is completely the same in structure as the flow guiding column 69 shown

[0084] The two relatively arranged inner cylinder walls of the lower cylinder body 67 connecting the hinge shaft 72 are called the first inner cylinder wall and the second inner cylinder wall. The lengths of the two flow guiding plates of the flow guiding column 69 are slightly smaller than the distance between the first inner cylinder wall and the second inner cylinder wall, so that the two flow guiding plates can freely rotate around the hinge shaft 72 without being blocked by the first inner cylinder wall and the second inner cylinder wall. The support plate 77 is in a rectangular plate-like structure and is arranged horizontally between the lower sides of the two flow guiding plates of the flow guiding column 69. The length direction of the support plate 77 is the same as the length direction of the two flow guiding plates, that is, one long side of the support plate 77 abuts against the lower side of the first flow guiding plate 70, and the other long side of the support plate 77 abuts against the lower side of the second flow guiding plate 71. In order to avoid hard contact between the support plate 77 and the flow guiding plate, rubber pads 78 are arranged at the edges of the two long sides of the support plate 77, which can extend the service life of the flow guiding column 69 and the elastic support device.

[0085] The length of the support plate 77 can be equal to or slightly smaller than the lengths of the two flow guiding plates. Two springs 79 are provided below both ends of the support plate 77, and the two springs 79 are arranged along the width direction of the support plate 77, as shown in Figure 13As shown, it can also be said that a spring 79 is located below the first deflector 70, and another spring 79 is located below the second deflector 71. The upper ends of the two springs 79 below one end of the support plate 77 are fixedly connected to the support plate 77, and the lower ends are respectively fixedly connected to the two bearing plates 80, and the two bearing plates 80 are both fixed on the first inner cylinder wall; the upper ends of the two springs 79 below the other end of the support plate 77 are fixedly connected to the support plate 77, and the lower ends are also respectively fixedly connected to the two bearing plates 80, and the two bearing plates 80 are both fixed on the second inner cylinder wall.

[0086] The distance between the two deflectors of the deflector post 69 can be adjusted by the telescopic device, and thus the gap between two adjacent deflector posts 69 can be adjusted, and the residence time of the material in the conditioning section can also be adjusted.

[0087] In the initial state, a pre-compression force is applied to the spring 79. In this way, when the distance between the two deflectors of the deflector post 69 is increased by the telescopic device, the spring 79 elongates, and the spring 79 then pushes the support plate 77 upward until the support plate 77 abuts against the lower sides of the two deflectors again; when the distance between the two deflectors of the deflector post 69 is decreased, first press the support plate 77 downward to compress the spring 79, and then decrease the distance between the two deflectors of the deflector post 69 by the telescopic device. After the distance between the two deflectors reaches the required value, release the support plate 77, and the spring 79 then elongates and pushes the support plate 77 upward until the support plate 77 abuts against the lower sides of the two deflectors again. Thus, it can be seen that no matter what the distance between the two deflectors of the deflector post 69 is, that is, no matter what the angle γ between the two deflectors of the deflector post 69 is, under the action of the spring 79, the support plate 77 always abuts against the lower sides of the two deflectors to support the two deflectors.

[0088] When the material falls through the gap between two adjacent flow guiding columns 69, for each flow guiding column 69, the material will push the first flow guiding plate 70 towards the second flow guiding plate 71, and at the same time, the material will also push the second flow guiding plate 71 towards the first flow guiding plate 70. If the material thrusts on both sides of the flow guiding column 69 are equal, the whole formed by the two flow guiding plates and the telescopic device will not rotate around the hinge shaft 72; if the material thrusts on both sides of the flow guiding column 69 are not equal, then the whole formed by the two flow guiding plates and the telescopic device will have a tendency to rotate around the hinge shaft 72. That is, when the material thrust acting on the first flow guiding plate 70 is larger, the whole formed by the two flow guiding plates and the telescopic device has a tendency to move around the hinge shaft 72 from the first flow guiding plate 70 towards the second flow guiding plate 71; when the material thrust acting on the second flow guiding plate 71 is larger, the whole formed by the two flow guiding plates and the telescopic device has a tendency to move around the hinge shaft 72 from the second flow guiding plate 71 towards the first flow guiding plate 70. However, since the two springs 79 under each end of the support plate 77 are arranged along the width direction of the support plate 77, that is, one spring 79 is located below the first flow guiding plate 70 and the other spring 79 is located below the second flow guiding plate 71. That is to say, the four springs 79 are respectively located at the four corners of the support plate 77, so that the support plate 77 can always maintain a horizontal support state. In this way, even if the whole formed by the two flow guiding plates and the telescopic device has a tendency to rotate around the hinge shaft 72, under the blocking action of the support plate 77, this whole will not rotate around the hinge shaft 72, or only rotate by a small angle, so that the gap between two adjacent flow guiding columns 69 will not change significantly, thus not affecting the falling of the material. After the material has fallen, under the action of the spring 79, the support plate 77 and the whole formed by the two flow guiding plates and the telescopic device return to their original states again.

[0089] In summary, Figure 12-15 For the shown flow guiding column 69, the distance between the two flow guiding plates of the flow guiding column 69 can be adjusted through the telescopic device, and further, the gap between two adjacent flow guiding columns 69 can be adjusted, and further, the time for the material to pass through the slow-down section can be adjusted. After the distance between the two flow guiding plates of the flow guiding column 69 is adjusted to the required value, under the action of the spring 79, the support plate 77 will support the adjusted positions of the two flow guiding plates, so that the two flow guiding plates are always in an inverted V shape, that is, the support plate 77 will limit the position of the flow guiding column 69, preventing the whole formed by the two flow guiding plates and the telescopic device from rotating around the hinge shaft 72 and changing the position of the flow guiding column 69. That is to say, the gap between two adjacent flow guiding columns 69 will not change or only change very little, so that the material can smoothly pass through the slow-down section.

[0090] As Figure 1 、 2 shown, the using method of the corn drying system of the present utility model includes the following steps:

[0091] Close the grain discharging device 10, the first to third stage electric air dampers, and the air inlet dampers 42 on the housing of the first to third stage heat pump unit air conditioning device, and let the first air damper 40 and the second air damper 50 of the first to third stage heat pump unit air conditioning device close the first ventilation opening 41 and the third ventilation opening 49 respectively. Feed the material from the feed inlet into the grain storage section in the drying tower 1.

[0092] Open the air inlet damper 42 and the axial flow fan 48 of the third stage heat pump unit air conditioning device 34 in sequence, then open the third stage circulating ventilation fan 25. After the medium for drying the material (i.e., the above-mentioned drying medium) flows stably, start the heat pump unit of the third stage heat pump unit air conditioning device 34. Thus, the opening of the third stage heat pump unit air conditioning device 34 is completed. After that, open the second stage heat pump unit air conditioning device 35 and the first stage heat pump unit air conditioning device 36 in sequence. The opening methods of the second stage heat pump unit air conditioning device 35 and the first stage heat pump unit air conditioning device 36 are the same as that of the third stage heat pump unit air conditioning device 34. After the outlet air temperatures of the first to third stage heat pump unit air conditioning devices all reach the set value, then open the cooling fan 28, the pressure stabilizing air damper 65, and the grain discharging device 10 in sequence.

[0093] Let the first air damper 40 and the second air damper 50 of the first to third stage heat pump unit air conditioning device close the first port 39 and the second port 51 respectively, then close the air inlet damper 42 and the axial flow fan 48 of the first to third stage heat pump unit air conditioning device. When the outlet air temperatures of the first to third stage heat pump unit air conditioning devices are all greater than the set value, open the first to third stage electric air dampers to supply air to the first to third stage heat pump unit air conditioning devices, and adjust the opening degrees of the first to third stage electric air dampers according to the outlet air temperatures of the first to third stage heat pump unit air conditioning devices, so that the outlet air temperatures of the first to third stage heat pump unit air conditioning devices meet the set value. At the same time, adjust the ventilation volume of the cooling fan 28 according to the discharging temperature of the material in the discharging section, so that the discharging temperature meets the set value. Adjust the opening degree of the grain discharging device 10 according to the discharging humidity of the material in the discharging section, so that the discharging humidity meets the set value.

[0094] When ending the work, stop feeding the material. When the material is discharged to the low position of the grain storage section, stop the operation of the heat pump unit of the first stage heat pump unit air conditioning device 36. After a delay for a period of time, stop the operation of the first stage circulating ventilation fan 15. When the material is discharged to the second heating section, stop the operation of the heat pump unit of the second stage heat pump unit air conditioning device 35. After a delay for a period of time, stop the operation of the second stage circulating ventilation fan 20. When the material is discharged to the third heating section, stop the operation of the heat pump unit of the third stage heat pump unit air conditioning device 34. After a delay for a period of time, stop the operation of the third stage circulating ventilation fan 25. When the material is discharged to the cooling section, close the cooling fan 28 until all the material is emptied.

[0095] The difference between the corn drying system of the present utility model and the prior art lies in that the heat pump unit air conditioning device in the present utility model forms a drying medium (air) circulation system after being connected to the drying tower 1. When the drying medium flows through the drying tower 1, it can dry the materials (corn) therein. After that, when the drying medium flows through the heat pump unit of the heat pump unit air conditioning device, it can be dehumidified and heated. The dried medium after dehumidification and heating then flows back into the drying tower 1 to dry the materials, and so on in a cycle. When the dried materials flow through the cooling section of the drying tower 1, outdoor air enters the cooling section through the cooling air inlet pipeline 29 to cool the materials. After the air absorbs the heat of the materials and its temperature rises, the air then enters the intake side of the condenser 52 of the heat pump unit of the heat pump unit air conditioning device through the cooling air return pipeline, and after being heated by the condenser 52, it enters the drying tower 1 together with the drying medium to dry the materials. There are two functions of passing the outdoor air through the cooling section and then introducing it into the heat pump unit air conditioning device (i.e., making up air for the drying medium circulation system): one is that it can recover the waste heat after the materials are dried and input it into the drying medium circulation system; the other is that if air is not made up for the drying medium circulation system, as the drying operation progresses, the heat loss of the system is less than the input of the driving energy (the heat generated by the operation of the heat pump unit), which will cause the temperature and humidity of the drying medium to become larger and larger, and finally the heat pump unit cannot work properly. In order to avoid such a situation, the present utility model can make up air for the drying medium circulation system, that is, even after the outdoor air absorbs the waste heat after the materials are dried, its temperature and humidity are much lower than those of the drying medium. Therefore, by adjusting the air make-up volume, it is possible to control the drying medium to maintain a constant temperature and low humidity state when drying the materials, and this can also increase the dehumidification amount of materials per unit energy consumption. After making up air for the drying medium circulation system, the excess drying medium with relatively high temperature and humidity is discharged from the exhaust port to the outside air. Thus, it can be seen that the present utility model can continuously dry corn, with energy conservation, environmental protection and high efficiency.

[0096] The present utility model can continuously and in large quantities dry and process large-grained corn crops. Different drying temperatures and control programs are adopted for edible corn, industrial corn, feed corn, and seed corn to ensure product quality and increase production capacity; heat is recycled, and the efficiency of the heat pump is not affected by the ambient temperature; a semi-closed air-drying system is adopted to make full use of the external environment to adjust the temperature and humidity inside the system, maintain the best temperature and humidity range for drying the materials, reduce the energy consumption per production unit, and increase the production capacity per unit.

[0097] The heat pump drying technology heats the drying medium through a heat pump and sends it into the drying chamber for heat and moisture exchange with the material to be dried, and then discharges it from the drying chamber. In the existing heat pump drying technology, one way to discharge the drying medium from the drying chamber is to directly discharge it into the atmosphere, which is called an open heat pump drying system. The other way is to send the drying medium back to the heat pump evaporator 45 for heat recovery, cooling and dehumidification, and then send it into the drying chamber after being heated by the condenser 52 to form a closed drying medium circulation system. The open heat pump drying system extracts heat from the atmosphere, and the temperature, humidity content and heat pump energy efficiency of the heated drying medium are affected by the ambient temperature. The closed drying medium circulation system realizes the recycling of energy, and the temperature, humidity content and heat pump energy efficiency of the heated drying medium are constant. Through the energy balance analysis and calculation of the closed drying medium circulation system, the heat loss of the system is less than the input of the system driving energy (the heat generated by the operation of the heat pump unit). Therefore, the system needs to discharge the excess heat to balance the system energy, and the calculation results are consistent with the actual test results.

[0098] During the heating and drying of materials, it is necessary to ensure the quality of the materials and prevent the destruction of the effective components of the materials due to excessive drying, or the cracking or damage of the materials. Therefore, it is necessary to limit the heating temperature and drying time of the materials. Under the limited conditions, the main factors affecting the drying efficiency are the temperature, humidity and flow rate of the drying medium. After the drying heat supply parameters and physical structure of the system are determined (that is, the temperature and flow rate of the drying medium are also determined), the only factor affecting the dehumidification efficiency is the humidity of the drying medium, that is, the lower the inlet air humidity, the better the drying effect.

[0099] Based on this, the present utility model is designed as a semi-open heat pump drying system, which utilizes the air after cooling the material. Its temperature is about 8°C higher than the ambient temperature, and the relative humidity is lower than the humidity of the drying medium in the closed system. Taking this as a cold source, it is supplemented to the intake side of the condenser 52 of the air conditioning device of the heat pump unit, so as to balance the heat of the drying medium circulation system, reduce the moisture content of the drying medium, recover and utilize the waste heat after the material is dried (that is, the heat released by the material being cooled), and improve the dehumidification amount per unit energy consumption.

[0100] The drying tower 1 adopts a metal tower structure. The material enters the grain storage section from the feed inlet above the tower, and then flows through the drying section, cooling section, and grain discharging section from top to bottom in sequence, and finally discharges out of the tower from the discharge outlet. The drying section is divided into a heat supply section and a tempering section, with a total of three stages in series, and continuous heat replenishment evaporation drying and tempering are carried out three times. The drying section is provided with inlet / return air angled pipes. The high-temperature drying medium flows into the drying section from the inlet air angled pipe and flows out from the return air angled pipe, and the flow direction is the same as that of the material flow, that is, both flow from top to bottom in the drying tower 1. The drying section and the cooling section jointly complete the temperature rise, moisture evaporation, moisture migration, and material cooling of the material. The upper part of the angled pipe is a sharp corner, which is convenient for separating the material and sliding down from the side, and the lower part of the angled pipe is open. The drying medium flows downward from the inlet air angled pipe and finally flows out of the tower through the return air angled pipe. During this process, the drying medium is in full contact with the material for energy exchange. The moisture in the material is evaporated by heat and discharged out of the tower with the drying medium. The material completes the migration of the internal moisture to the surface in the tempering section, which is convenient for the moisture evaporation in the next heat supply section. The cooling section is provided with a cooling inlet air angled pipe 8 and a cooling return air angled pipe 9, and normal temperature air enters to cool the material. Whether in the heat supply section or the cooling section, the inlet / return air angled pipes are arranged in pairs. The inlet air angled pipes are horizontally arranged at a certain interval above the return air angled pipes, and the return air angled pipes are horizontally arranged below the inlet air angled pipes. The inlet / return air angled pipes are perpendicular to each other, which is convenient for the uniform distribution of air flow and full contact with the material. The inlet / return air angled pipes have the same size and the same number. The outer cylinder wall of the drying tower 1 is covered with a heat insulation layer (the heat insulation layer is made of polyurethane foam), and a metal protective layer is provided outside the heat insulation layer. That is to say, the heat insulation layer is located between the outer cylinder wall of the drying tower 1 and the metal protective layer, so that the drying tower 1 can be applicable to outdoor operations in cold regions in winter (below -35°C).

[0101] The air inlet of the cooling fan 28 is communicated with the atmosphere, and the air outlet of the cooling fan 28 is connected with the cooling air inlet chamber 26 of the cooling section. The cooling fan 28 sends outdoor air into the cooling section to complete the material cooling, and sends the heated air into the heat pump unit air conditioning device to recover the waste heat after the material is dried and put it into the drying medium circulation system.

[0102] The air inlet doors 42 and the axial flow fans 48 on the shells of the first-stage to third-stage heat pump unit air conditioning devices are all communicated with the atmosphere. After the heat pump unit air conditioning device is connected with the drying tower 1, a drying medium circulation system is formed. The heat pump unit air conditioning device completes the initial heat storage of the system, and controls the drying medium to maintain a constant temperature and low humidity to dry the material by adjusting the makeup air volume, so as to improve the moisture dehumidification amount of the material per unit energy consumption.

[0103] As Figure 1 、 2 shown, the corn drying system of the present invention has two working conditions during the use process, namely the initial heat storage working condition and the constant temperature and low humidity working condition, which will be described in detail below.

[0104] Initial heat storage condition: When the corn drying system is initially started, close the first air damper 40 and the second air damper 50 to close the first ventilation opening 41 and the third ventilation opening 49 respectively, open the intermediate air duct 55, then successively open the air inlet damper 42 and the axial flow fan 48 of the three-stage heat pump unit air conditioner 34, then open the three-stage circulating ventilation fan 25, and start the heat pump unit of the three-stage heat pump unit air conditioner 34 after the medium flow of the dried material is stable. Thus, the opening of the three-stage heat pump unit air conditioner 34 is completed. Then, use the same method to successively open the two-stage heat pump unit air conditioner 35 and the one-stage heat pump unit air conditioner 36. The air in the environment enters the air inlet chamber 44 through the air inlet damper 42, is absorbed by heat through the evaporator 45 and then discharged through the axial flow fan 48; at the same time, the drying medium is driven by the circulating ventilation fan, enters the drying air inlet chamber, then enters the air inlet angle pipe, dries the material and then enters the drying air outlet chamber from the return air angle pipe, enters the first dust removal chamber 38 of the heat pump unit air conditioner through the drying return air pipeline for dust removal, and the dried medium after dust removal enters the air mixing chamber 53 through the intermediate air duct 55, is heated by the condenser 52 and then enters the air outlet chamber 54, and is then discharged through the circulating ventilation fan. Such a cycle is carried out to raise the temperature of the drying medium in the system to the working temperature within 10 - 30 minutes.

[0105] Constant temperature and low humidity condition: After the temperature of the drying medium in the corn drying system rises to the working temperature, close the first port 39 and the second port 51 with the first air damper 40 and the second air damper 50 respectively, that is, close the intermediate air duct 55, then close the air inlet damper 42 and the axial flow fan 48, start the cooling fan 28, close the electric air damper, and open the pressure stabilizing air damper 65. The drying medium in the system is first cooled and dehumidified by the evaporator 45, then heated and raised in temperature by the condenser 52, then enters the drying section to dry the material, and then returns to the heat pump unit air conditioner for dust removal, dehumidification and temperature rise. Such a cycle is carried out. At the same time, the cooling fan 28 inputs outdoor air into the cooling section to cool the material, and then the air enters the second dust removal chamber 31 through the first sub-cooling return air pipeline 30 for dust removal, and then is discharged into the atmosphere through the second sub-cooling return air pipeline 58. The air exhaust volume is controlled by the pressure stabilizing air damper 65 to keep the air pressure in the second sub-cooling return air pipeline 58 constant. When the temperature of the drying medium is higher than the design temperature, open and adjust the electric air damper to control the make-up air volume, and the excess drying medium is discharged through the air outlet of the constant pressure chamber 47 after recovering heat through the evaporator 45 (at this time, the axial flow fan 48 on the air outlet is in the closed state, but it does not affect the air outlet for air exhaust). The corn drying system improves the dehumidification amount per unit energy consumption by supplementing the low-temperature and low-humidity cooling return air into the drying medium circulation system to keep the energy of the drying medium circulation system balanced and the drying medium in a constant temperature and low humidity state.

[0106] Such as Figure 1 、 2As shown in the figure, in order to achieve the intelligent control of the corn drying system, a control system 33 is adopted, and temperature sensors and humidity sensors are provided on the air inlet pipelines of the first to third stages of drying, temperature sensors and humidity sensors are provided on the air return pipelines 23 of the first to third stages of drying, temperature sensors and humidity sensors are provided on the cooling air inlet pipeline 29, temperature sensors, humidity sensors and pressure sensors are provided on the second sub-cooling air return pipeline 58, and temperature sensors and humidity sensors are provided on the grain discharging section. The above temperature sensors, humidity sensors and pressure sensors are all connected to the control system 33.

[0107] The control system 33 is also connected to a pressure stabilizing air damper 65, an electric air damper, a motor 56 that controls the first air damper 40 and the second air damper 50, a circulating ventilator, a cooling fan 28, a grain discharger 10, an air inlet damper 42, an axial flow fan 48 and a controller 32 of a heat pump unit. The control system 33 can control the operation of the above electric components.

[0108] The temperature sensors and humidity sensors on the air inlet pipelines of the first to third stages of drying are used to detect the temperature and humidity of the air inlet pipelines of the first to third stages of drying. The temperature sensors and humidity sensors on the air return pipelines of the first to third stages of drying are used to detect the temperature and humidity of the air return pipelines of the first to third stages of drying. The temperature sensors and humidity sensors on the cooling air inlet pipeline 29 are used to detect the temperature and humidity of the cooling air inlet pipeline 29.

[0109] The temperature sensors and humidity sensors on the second sub-cooling air return pipeline 58 are used to detect the temperature and humidity of the second sub-cooling air return pipeline 58. The pressure sensor can detect the gas pressure of the second sub-cooling air return pipeline 58 and transmit it to the control system 33. The control system 33 can control the opening degree of the pressure stabilizing air damper 65 according to the detected gas pressure so as to keep the gas pressure in the second sub-cooling air return pipeline 58 constant.

[0110] The temperature sensors and humidity sensors on the grain discharging section are used to detect the temperature and humidity of the materials in the grain discharging section and transmit the detected temperature and humidity to the control system 33. The control system 33 can adjust the ventilation volume of the cooling fan 28 according to the temperature (when the material temperature is too high, increase the ventilation volume of the cooling fan 28; when the material temperature is too low, decrease the ventilation volume of the cooling fan 28). The control system 33 can adjust the opening degree of the grain discharger 10 according to the humidity (when the material humidity is too large, decrease the opening degree of the grain discharger 10; when the material humidity is too small, increase the opening degree of the grain discharger 10).

[0111] The utility model realizes one-key start, automatic operation, analog control, continuous drying of materials, discharging at constant temperature and humidity, automatically realizes initial preheating, constant temperature drying, energy balance adjustment, three-stage constant temperature dehumidification of the drying medium, gradually shutting down and emptying, and ending the work through the control system 33.

[0112] The system is divided into four drying modes for edible corn, industrial corn, feed corn, and seed corn. The drying process for each mode is the same, and parameters such as the temperature of the material being heated, the temperature of the drying medium, and the drying time can be set with one key and automatically adjusted.

[0113] During the automatic control process, the drying process is divided into an initial preheating section, a constant temperature drying section, and an evacuation end section.

[0114] Initial preheating section: More than 12 hours before the system starts, the power is turned on. All air inlet dampers 42, electric dampers, and grain dischargers 10 are in the closed state. The first damper 40 and the second damper 50 of the first-stage to third-stage heat pump unit air conditioning devices respectively close the first ventilation port 41 and the third ventilation port 49, that is, the middle air duct 55 is opened. The drying tower 1 is filled with materials up to the upper bin of the grain storage section, and the preparatory work before the system is turned on is completed. Startup process: Reset each machine, detect whether each device is in the pre-start state. After passing the detection, enter the startup process. First, turn on the third-stage heat pump unit air conditioning device, that is, sequentially open the air inlet damper 42 and the axial flow fan 48 of the third-stage heat pump unit air conditioning device 34 through the control system 33, then turn on the third-stage circulating ventilation fan 25. After the drying medium flow is stable, start the heat pump unit of the third-stage heat pump unit air conditioning device 34, and then sequentially turn on the second-stage heat pump unit air conditioning device 35 and the first-stage heat pump unit air conditioning device 36. The opening methods of the first-stage to second-stage heat pump unit air conditioning devices 36 and 35 are the same as that of the third-stage heat pump unit air conditioning device 34. The temperature sensors on the first-stage to third-stage drying air inlet pipelines respectively detect the outlet air temperatures of the first-stage to third-stage heat pump unit air conditioning devices. After the outlet air temperatures of the first-stage to third-stage heat pump unit air conditioning devices reach the set values, then sequentially turn on the cooling fan 28, the pressure stabilizing damper 65, and the grain discharger 10. The humidity sensor on the cooling section is used to detect the humidity of the materials discharged by the grain discharger 10. When the materials discharged in the initial period are wet materials, the wet materials need to be discharged to the wet material bin for re-drying. On the contrary, when the discharged materials are dry materials, they can directly enter the transportation and storage process.

[0115] Constant temperature drying section: Through the control system 33, the first air damper 40 and the second air damper 50 of the first-stage to third-stage heat pump unit air conditioning devices are respectively closed to the first port 39 and the second port 51, that is, the intermediate air duct 55 is closed, and then the air inlet dampers 42 and the axial flow fans 48 of each stage of the heat pump unit air conditioning devices are closed, and the drying medium circulation system is switched to the internal circulation. The outlet air temperatures of the first-stage to third-stage heat pump unit air conditioning devices are respectively detected by the temperature sensors on the first-stage to third-stage drying air inlet pipelines. When the outlet air temperature is greater than the set value, the first-stage to third-stage electric air dampers are opened for air supply, and the opening degrees of the first-stage to third-stage electric air dampers are adjusted according to the outlet air temperature so that the outlet air temperature meets the set value, balance the internal heat of the system, and ensure the constant temperature and stable operation of the system. The air supply volume in the system is regulated by the constant pressure of the exhaust port of the constant pressure chamber 47, that is, for every amount of air supplied, the same amount of air is discharged from the exhaust port. The first-stage to third-stage heat pump unit air conditioning devices operate independently. The temperature sensor and humidity sensor in the cooling section detect the temperature / humidity of the grain discharging section material online. The ventilation volume of the cooling fan 28 is controlled by the detected temperature of the grain discharging section material (when the material temperature is too high, increase the ventilation volume of the cooling fan 28; conversely, when the material temperature is too low, decrease the ventilation volume of the cooling fan 28) to control the temperature of the material after cooling. The discharging volume of the grain discharger 10 is controlled by the detected humidity of the grain discharging section material (when the material humidity is too high, reduce the opening degree of the grain discharger 10 to reduce the discharging volume; conversely, when the material humidity is too low, increase the opening degree of the grain discharger 10 to increase the discharging volume) to adjust the residence drying time of the material in the drying tower 1 and control the moisture content of the material after drying so that the discharging humidity meets the set value. The system detects the material bin position of the grain storage section and controls the grain storage volume to ensure the continuous operation of the system.

[0116] Emptying end section: When ending the work, stop feeding the material. When the material is discharged to the low bin position of the grain storage section, stop the heat pump unit of the first-stage heat pump unit air conditioning device 36 through the control system 33, and stop the first-stage circulating ventilation fan 15 after a 30s delay. When the material flows to the second-stage heating section, then stop the heat pump unit of the second-stage heat pump unit air conditioning device through the control system 33, and stop the second-stage circulating ventilation fan 20 after a 30s delay. When the material is discharged to the third-stage heating section, then stop the heat pump unit of the third-stage heat pump unit air conditioning device 34 through the control system 33, and stop the third-stage circulating ventilation fan 25 after a 30s delay. When the material is discharged to the cooling section, close the cooling fan 28 through the control system 33 until all the material is emptied, and each mechanism returns to the initial state.

[0117] When the corn drying system needs to be temporarily shut down during operation, the grain discharging device 10 is closed through the control system 33. Then, the heat pump units of the third-stage, second-stage, and first-stage heat pump group air conditioning devices 34, 35, and 36 are stopped in sequence to stop heating, the pressure stabilizing air damper 65 is closed, and the electric air damper is opened to allow the cooling return air to continuously supplement into the system. After a period of time, the materials in the drying tower 1 are cooled. During this process, the air outlet has been exhausting air outwards.

[0118] In the present utility model, low bin protection can also be designed, that is, when the materials in the grain storage section are lower than the low bin level, the temporary shutdown program is started and an audible and visual alarm is issued; data storage and analysis can also be carried out, recording the system operation parameters, outputting the operation curve, and calculating the dehumidification amount per unit energy consumption of the system.

[0119] It should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "middle", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0120] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0121] The above-described embodiments are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A corn drying system, characterized in that: The invention comprises a drying tower and a heat pump air conditioning device, wherein the drying tower is a vertically arranged cylindrical structure, the outer cylinder wall of the drying tower is coated with a heat insulation layer, the outer side of the heat insulation layer is provided with a metal protective layer, the drying tower is provided with a feed inlet, a grain storage section, a drying section, a cooling section, a grain discharge section and a discharge port in sequence from top to bottom, the heat pump air conditioning device comprises a shell, a heat pump unit is provided in the shell, an air outlet, a return air outlet and an air exhaust outlet are provided on the shell, and the air outlet is connected to the drying air inlet pipeline through the drying air inlet pipeline. To the drying section of the drying tower, the return air outlet is connected to the drying section of the drying tower through a drying return air duct, a circulating fan is connected to the drying air inlet duct or the drying return air duct, a cooling air inlet duct and a cooling return air duct are connected to the cooling section of the drying tower, a cooling fan is connected to the cooling air inlet duct or the cooling return air duct, an end of the cooling return air duct away from the drying tower is connected to the air inlet side of the condenser of the heat pump unit, and the exhaust outlet is arranged on the air outlet side shell of the evaporator of the heat pump unit.

2. The corn drying system according to claim 1, characterized in that: A first dust removal chamber, an air inlet chamber, a constant pressure chamber, an air mixing chamber and an air outlet chamber which are connected in sequence are provided in the shell; the return air port is provided on the shell of the first dust removal chamber; a first dust removal device is provided in the first dust removal chamber; the return air port is connected to the inlet of the first dust removal device; the first dust removal chamber and the air inlet chamber are connected via a first vent; the air inlet chamber and the constant pressure chamber are connected via a second vent; an evaporator of a heat pump unit is provided on the second vent; a compressor of a heat pump unit is provided in the constant pressure chamber; the exhaust port is provided on the shell of the constant pressure chamber; the constant pressure chamber and the air mixing chamber are connected via a third vent; the air mixing chamber and the air outlet chamber are connected via a fourth vent; a condenser of the heat pump unit is provided on the fourth vent; and the air outlet is provided on the shell of the air outlet chamber.

3. The corn drying system according to claim 2, characterized in that: The shell body is also provided with an intermediate air duct connecting the first dust removal chamber and the air mixing chamber, the two ports of the intermediate air duct are respectively a first port and a second port, the first port is located in the first dust removal chamber, the second port is located in the air mixing chamber, a first damper is hingedly provided in the first dust removal chamber, and a second damper is hingedly provided in the air mixing chamber, the first damper can close the first vent or the first port when rotating, and the second damper can close the third vent or the second port when rotating, an air inlet door is provided on the shell body of the air inlet chamber, and an axial flow fan is installed on the air outlet.

4. The corn drying system according to claim 3, characterized in that: The cooling return air duct includes a first sub-cooling return air duct and a second sub-cooling return air duct, one end of the first sub-cooling return air duct is connected to the cooling section of the drying tower, the other end of the first sub-cooling return air duct is connected to the inlet of the second dust removal chamber, a second dust removal device is provided in the second dust removal chamber, the inlet of the second dust removal device is connected to the inlet of the second dust removal chamber, the outlet of the second dust removal chamber is connected to one end of the second sub-cooling return air duct, the other end of the second sub-cooling return air duct is connected to a pressure-stabilizing damper, an air supply duct is connected between the second sub-cooling return air duct and the air mixing chamber of the shell, and an electric damper is connected to the air supply duct.

5. The corn drying system according to claim 4, characterized in that: The drying section includes a first-level heating section, a first-level slow-down section, a second-level heating section, a second-level slow-down section, a third-level heating section and a third-level slow-down section, which are arranged in sequence from top to bottom. The first-level heating section is provided with a first-level air inlet angle tube, a first-level return air angle tube, a first-level drying air inlet chamber and a first-level drying air outlet chamber. The first-level air inlet angle tube and the first-level return air angle tube are both arranged in the drying tower. The first-level drying air inlet chamber and the first-level drying air outlet chamber are both arranged outside the drying tower. The first-level air inlet angle tube is located above the first-level return air angle tube. The first-level air inlet angle tube and the first-level return air angle tube are arranged perpendicular to each other. The first-level air inlet angle tube is connected to the first-level drying air inlet chamber. The first-level return air angle tube is connected to the first-level drying air outlet chamber. The second-level heating section is provided with a second-level air inlet angle tube. Angle tube, secondary return air angle tube, secondary drying air inlet chamber and secondary drying air outlet chamber, the secondary air inlet angle tube and the secondary return air angle tube are both arranged in the drying tower, the secondary drying air inlet chamber and the secondary drying air outlet chamber are both arranged outside the drying tower, the secondary air inlet angle tube is located above the secondary return air angle tube, the secondary air inlet angle tube and the secondary return air angle tube are arranged perpendicular to each other, the secondary air inlet angle tube is connected with the secondary drying air inlet chamber, the secondary return air angle tube is connected with the secondary drying air outlet chamber, the three-stage heating section is provided with a three-stage air inlet angle tube, a three-stage return air angle tube, a three-stage drying air inlet chamber and a three-stage drying air outlet chamber, the three-stage air inlet angle tube and the three-stage return air angle tube are both arranged in the drying tower, the three-stage drying air inlet chamber and the three-stage drying The drying and outlet air chambers are all arranged outside the drying tower, the three-stage air inlet angular tube is located above the three-stage return air angular tube, the three-stage air inlet angular tube and the three-stage return air angular tube are arranged vertically to each other, the three-stage air inlet angular tube is connected to the three-stage drying air inlet chamber, the three-stage return air angular tube is connected to the three-stage drying air outlet chamber, the heat pump group air conditioning device is set to three, the three heat pump group air conditioning devices are respectively a first-stage heat pump group air conditioning device, a second-stage heat pump group air conditioning device and a third-stage heat pump group air conditioning device, the drying air inlet pipeline and the drying return air pipeline are both set to three, the three drying air inlet pipelines are respectively a first-stage drying air inlet pipeline, a second-stage drying air inlet pipeline and a third-stage drying air inlet pipeline, the three drying return air pipelines are respectively a first-stage drying return air pipeline, a second-stage drying return air pipeline and a third-stage drying return air pipeline. The air outlet of the shell of the first-stage heat pump group air conditioning device is connected to the first-stage dry air inlet chamber through the first-stage dry air inlet pipeline, the air return port of the shell of the first-stage heat pump group air conditioning device is connected to the first-stage dry air outlet chamber through the first-stage dry air return pipeline, the first-stage dry air inlet pipeline or the first-stage dry air return pipeline is connected with a first-stage circulating fan, the shell outlet of the second-stage heat pump group air conditioning device is connected to the second-stage dry air inlet chamber through the second-stage dry air inlet pipeline, the shell return port of the second-stage heat pump group air conditioning device is connected to the second-stage dry air outlet chamber through the second-stage dry air return pipeline,The secondary drying air inlet duct or the secondary drying air return duct is connected to a secondary circulation fan, the shell outlet of the three-stage heat pump group air-conditioning device is connected to the three-stage drying air inlet chamber through the three-stage drying air inlet duct, and the shell return air outlet of the three-stage heat pump group air-conditioning device is connected to the three-stage drying air outlet chamber through the three-stage drying return air duct. The three-stage drying air inlet duct or the three-stage drying return air duct is connected to a three-stage circulation fan, the air supply duct is provided with three, and the three air supply ducts are respectively a primary air supply duct, a secondary air supply duct and a tertiary air supply duct, the electric damper is provided with three, and the three electric dampers are respectively a primary electric damper, a secondary electric damper and a tertiary electric damper, a primary air supply duct is connected between the second sub-cooling return air duct and the shell air mixing chamber of the first-stage heat pump group air-conditioning device, the primary electric damper is connected to the primary air supply duct, the second sub-cooling return air duct and the shell air mixing chamber of the two-stage heat pump group air-conditioning device A secondary air supply pipe is connected between the two parts, a secondary electric damper is connected to the secondary air supply pipe, a third air supply pipe is connected between the second sub-cooling return air pipeline and the shell air mixing chamber of the three-stage heat pump group air conditioning device, a third electric damper is connected to the third air supply pipe, a cooling air inlet angle pipe, a cooling return air angle pipe, a cooling air inlet chamber and a cooling air outlet chamber are provided on the cooling section, the cooling air inlet angle pipe and the cooling return air angle pipe are both arranged in the drying tower, the cooling air inlet chamber and the cooling air outlet chamber are both arranged outside the drying tower, the cooling air inlet angle pipe is located above the cooling return air angle pipe, the cooling air inlet angle pipe and the cooling return air angle pipe are arranged perpendicular to each other, the cooling air inlet angle pipe is communicated with the cooling air inlet chamber, the cooling return air angle pipe is communicated with the cooling air outlet chamber, the cooling air inlet chamber is connected to the cooling air inlet pipe, the cooling air outlet chamber is connected to one end of the first sub-cooling return air pipeline, and a grain discharger is provided on the grain discharge section.

6. The corn drying system according to claim 5, characterized in that: The first-stage slow-release section, the second-stage slow-release section and the third-stage slow-release section all include an upper cylinder and a lower cylinder that are fixedly connected. The upper cylinder is located above the lower cylinder. The shape of the upper cylinder matches the shape of the inner cylinder wall of the drying tower. The upper cylinder is fixed on the inner cylinder wall of the drying tower. The lower cylinder is a square cylindrical structure. A plurality of horizontally arranged guide columns are provided in the cylinder cavity of the lower cylinder. The plurality of guide columns are parallel to each other and arranged at intervals.

7. The corn drying system according to claim 6, characterized in that: The guide column includes a hinge shaft, a first guide plate and a second guide plate, the two ends of the hinge shaft are respectively fixedly connected to the two oppositely arranged inner cylinder walls of the lower cylinder, the first guide plate and the second guide plate are arranged from top to bottom, the upper ends of the first guide plate and the second guide plate are hinged on the hinge shaft, a telescopic device capable of adjusting the distance between the first guide plate and the second guide plate is connected between the first guide plate and the second guide plate, the first guide plate and the second guide plate are both detachable and fixedly connected to the two oppositely arranged inner cylinder walls of the lower cylinder, and the first guide plate and the second guide plate together form an inverted V-shaped structure.

8. The corn drying system according to claim 6, characterized in that: The guide column includes a hinge shaft, a first guide plate and a second guide plate, the two ends of the hinge shaft are respectively fixedly connected to two oppositely arranged inner cylinder walls of the lower cylinder, the first guide plate and the second guide plate are arranged from top to bottom, the upper ends of the first guide plate and the second guide plate are hinged on the hinge shaft, a telescopic device capable of adjusting the distance between the first guide plate and the second guide plate is connected between the first guide plate and the second guide plate, the first guide plate and the second guide plate together form an inverted V-shaped structure, an elastic support device is provided under the guide column, the elastic support device includes a support plate abutting between the first guide plate and the second guide plate, and the support plate is supported on the inner cylinder wall of the lower cylinder by a spring.

9. The corn drying system according to claim 7 or 8, characterized in that: The telescopic device includes a first rod, a second rod and an annular buckle, and a first threaded hole and a second threaded hole arranged opposite to each other are provided on the annular wall of the annular buckle. One end of the first rod is threadedly connected in the first threaded hole, and the other end of the first rod is hinged on the first guide plate. One end of the second rod is threadedly connected in the second threaded hole, and the other end of the second rod is hinged on the second guide plate.

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