A grain bin drying system

Abstract

The application discloses a kind of granary drying systems, it is related to the field of granary, especially it is related to a kind of granary drying systems, including heat collecting and drying system, automatic control system, solar power generation system.The heat collecting and drying system includes flat-plate solar collector, water pump, water tank, electromagnetic valve, fan, finned tube heat exchanger, ventilation vertical cylinder, the ventilation vertical cylinder includes vertical cylinder end cap, spiral column, cross ring, ventilation pipeline, filter screen, the spiral of the spiral column is variable pitch spiral, and the pitch of variable pitch spiral gradually increases from below to above along the axial direction of spiral column.The spiral column of the application adopts variable pitch design, increases the hot air flow to the lower part of grain pile, so that the overall drying of grain pile is more uniform;The design of double water circulation stores heat when the granary stops drying, improves drying efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of grain storage, in particular to a grain storage drying system. BACKGROUND

[0002] After the harvest, the farmer needs to dry the grain, otherwise it is easy to cause the grain to heat up and cause the grain to mildew. The use of grain drying equipment can greatly reduce the waste of grain. For example, patent CN209594318U discloses a solar heat pump solution combined with a warehouse drying and low-temperature ventilation and storage grain all-in-one machine. The all-in-one machine uses a solar hot water circulating device, a heat pump circulating device and a solution dehumidification circulating device to heat dry air. The grain in the warehouse absorbs heat from the hot air to reduce its own water content, thereby achieving the effect of drying. However, the method of directly sending the heated and dried air into the warehouse for high-temperature drying has low drying efficiency. In the case where the internal ventilation pipeline of the warehouse is not designed, the hot air flow at the upper part of the grain pile is large, the grain at the lower part of the grain pile is compacted, resulting in small hot air flow at the lower part of the grain pile, and the grain at the lower part of the grain pile is not fully dried, causing the grain at the lower part of the grain pile to mildew. At the same time, the existing solar drying device mostly uses a single water circulating device. Although the single water circulating device can also transfer the heat in the solar collector to the heat exchanger, the single water circulating device cannot store heat when the warehouse stops drying, causing the heat collected at that time to be lost. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art and provide a grain storage drying system. The helical column adopts a variable pitch design, which increases the hot air flow to the lower part of the grain pile, making the overall drying of the grain pile more uniform. The design of the double water circulation stores heat when the warehouse stops drying, improving the drying efficiency.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0005] A grain storage drying system, comprising a heat collecting and drying system, an automatic control system and a solar power generation system, characterized in that: the heat collecting and drying system comprises a flat plate solar collector, a water pump I, a water tank, a water pump II, a solenoid valve, a fan, a finned tube heat exchanger and a ventilation vertical cylinder; the ventilation vertical cylinder comprises a vertical cylinder end cover, a helical column, a cross ring, a ventilation pipeline and a filter screen.

[0006] The helical column of the present application is a variable pitch helical column, and the pitch of the variable pitch helical column gradually increases from bottom to top along the axial direction of the helical column. The helical column is located inside the filter screen, the vertical cylinder end cover is a circular plate, the upper end of the filter screen is welded to the vertical cylinder end cover, the lower end of the filter screen is welded to the bottom of the grain storage, the top end of the helical column is welded to the center of the vertical cylinder end cover, the circular ring of the cross ring is welded to the air outlet of the ventilation pipeline, and the bottom end of the helical column is welded to the center of the cross ring.

[0007] The water outlet of the flat-plate solar energy collector is communicated with the water inlet of the water pump I, the water outlet of the water pump I is communicated with the water inlet of the water tank, the water outlet of the water tank is divided into two paths, one path is communicated with the water inlet of the flat-plate solar energy collector, and the other path is communicated with the water inlet of the water pump II, the water outlet of the water pump II is communicated with the water inlet of the electromagnetic valve, the water outlet of the electromagnetic valve is communicated with the water inlet of the finned tube heat exchanger, and the water outlet of the finned tube heat exchanger is communicated with the water inlet of the water tank.

[0008] The automatic control system is composed of electromagnetic relay I, electromagnetic relay II, a server, a receiver and a controller.

[0009] The solar power generation system is composed of a photovoltaic electric plate, a photovoltaic controller and a storage battery.

[0010] The fan is fixed at the air inlet of the finned tube heat exchanger, and the air inlet of the ventilation pipeline is communicated with the air outlet of the finned tube heat exchanger.

[0011] The storage battery supplies power for the water pump I, the water pump II, the electromagnetic valve and the fan, the electromagnetic relay I controls the switch of the water pump I, and the electromagnetic relay II controls the switch of the water pump II, the electromagnetic valve and the fan.

[0012] The present application has the following advantages:

[0013] The helix of the spiral column is a variable-pitch helix, and the pitch gradually increases from the lower part to the upper part along the axial direction of the spiral column, so that the flow resistance is large at the lower part of the spiral column and the flow resistance is small at the upper part of the spiral column during the upward movement of the hot air, thereby improving the flow distribution of the hot air flowing to the grain pile.

[0014] The flat-plate solar energy collector, the water pump I and the water tank form water circulation I, and the water tank, the water pump II, the electromagnetic valve, the fan and the finned tube heat exchanger form water circulation II.

[0015] The ventilation vertical cylinder structure is used in the interior of the granary, and the beneficial effect of on-site drying of the grain can be achieved. The ventilation drying equipment is arranged in the interior of the granary, and the on-site drying of the grain can be achieved, without the need of the operation of unloading the granary, and the labor and equipment cost required in the unloading process is reduced; the grain can be intermittently ventilated and dried in the storage process, the moisture of the grain is reduced, the storage time of the grain is prolonged, and the quality of the grain is improved.

[0016] The heat of the water in the heat collecting and drying system is released to the air through the finned tube heat exchanger, and the relative humidity of the air can be kept at a low level while the temperature of the air is increased. The system uses solar energy as the heat source, and is green and environmentally friendly.

[0017] The automatic control system can automatically control the operation of the fan, the electromagnetic valve and the water pump according to the weather information, avoid the occurrence of harmful ventilation and invalid ventilation, prolong the time of beneficial ventilation, and improve the drying efficiency. The server in the system can control multiple granary equipment at the same time, and the management of the farmers is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0020] Figure 2 It is a schematic diagram of the spiral column structure of the present application.

[0021] Figure 3 It is an exploded schematic diagram of the spiral column of the present application.

[0022] Figure 4 It is a schematic diagram of the finned tube radiator structure of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0024] As shown in the drawings, Figure 1 The present application provides a granary drying system, which comprises a heat collecting and drying system, an automatic control system and a solar power generation system.

[0025] The heat collecting and drying system is composed of a flat-plate solar heat collector 1, a water pump I 2, a water tank 3, a water pump II 4, a solenoid valve 5, a fan 6, a finned tube heat exchanger 7, and a ventilation stand 8. The water outlet of the flat-plate solar heat collector 1 is communicated with the water inlet of the water pump I 2, the water outlet of the water pump I 2 is communicated with the water inlet of the water tank 3, the water outlet of the water tank 3 is divided into two routes, one of which is communicated with the water inlet of the flat-plate solar heat collector 1, and the other of which is communicated with the water inlet of the water pump II 4, the water outlet of the water pump II 4 is communicated with the water inlet of the solenoid valve 5, the water outlet of the solenoid valve 5 is communicated with the water inlet 701 of the finned tube heat exchanger, and the water outlet 702 of the finned tube heat exchanger is communicated with the water inlet of the water tank 3.

[0026] The automatic control system is composed of a solenoid relay I 12, a solenoid relay II 13, a server 14, a receiver 15, and a controller 16. The server 14 and the receiver 15 are wirelessly connected through a GPRS communication module, the receiver 15 and the controller 16 are connected through wires, the controller 16 and the solenoid relay I 12 are connected through wires, and the controller 16 and the solenoid relay II 13 are connected through wires.

[0027] The solar power generation system is composed of a photovoltaic panel 9, a photovoltaic controller 10, and a storage battery 11. The photovoltaic panel 9 is connected with the photovoltaic controller 10, the photovoltaic controller 10 is connected with the storage battery 11, and the storage battery 11 provides power for the fan 6, the water pump I 2, the water pump II 4, and the solenoid valve 5.

[0028] The fan 6 is fixed at the air inlet 703 of the finned tube heat exchanger, and the air inlet of the ventilation duct 804 is communicated with the air outlet 704 of the finned tube heat exchanger. The storage battery 11 supplies power for the water pump I 2, the water pump II 4, the solenoid valve 5, and the fan 6, the solenoid relay I 12 controls the switch of the water pump I 2, and the solenoid relay II 13 controls the switches of the water pump II 4, the solenoid valve 5, and the fan 6.

[0029] As Figure 2As shown, the present invention provides a structural diagram of a grain silo ventilation cylinder device, including a ventilation cylinder 8. The ventilation cylinder 8 is characterized by comprising a cylinder end cap 801, a spiral column 802, a cross ring 803, a ventilation duct 804, and a filter screen 805. The spiral of the spiral column 802 is a variable pitch spiral, with the pitch gradually increasing from bottom to top along the axial direction of the spiral column. The spiral column 802 is divided into four equal-length sections along its axial direction. Starting from the bottom of the spiral column 802, the pitch of the first section is 12%–13% of the total length of the spiral column 802, the pitch of the second section is 14%–16%, the pitch of the third section is 17%–18%, and the pitch of the fourth section is 19%–21%. A specific example of the dimensions of the spiral column 802 is as follows: the spiral column 802 has a height of 2000mm, a spiral outer diameter of 1000mm, a pitch of 250mm for the first part, a pitch of 300mm for the second part, a pitch of 350mm for the third part, and a pitch of 400mm for the fourth part. The filter screen 805 is made of wire mesh forming a cylinder. The spiral column 802 is located inside the filter screen 805. The cylinder end cover 801 is a circular plate with ventilation holes. The upper end of the filter screen 805 is welded to the cylinder end cover 801, and the lower end of the filter screen 805 is welded to the bottom of the grain bin. The top of the spiral column 802 is welded to the center of the cylinder end cover 801. The ring of the cross ring 803 is welded to the air outlet of the ventilation duct 804, and the bottom of the spiral column 802 is welded to the center of the cross ring 803. Hot air enters from the ventilation duct 804, passes through the filter screen 805, and enters the bin for grain drying.

[0030] The working process of this invention is as follows:

[0031] Water circulation system I consists of a flat-plate solar collector 1, a water pump I2, and a water tank 3. When the solar radiation intensity reaches a set value, electromagnetic relay I12 is activated, and water pump I2 operates, causing water to circulate between the flat-plate solar collector 1, water pump I2, and water tank 3. The flat-plate solar collector 1 collects heat and stores it in the water. After being heated, the water flows into the water tank 3 for insulation, and then flows back into the flat-plate solar collector 1 to absorb heat.

[0032] The set value for solar radiation intensity is within the range of 900 W / m. 2 ~1100W / m 2 The specific value should be set within the range according to actual needs.

[0033] Water circulation II consists of water tank 3, water pump II 4, solenoid valve 5, and finned tube heat exchanger 7. When the water temperature in the water tank is higher than the set value, electromagnetic relay II 13 is activated, water pump II 4 runs, and solenoid valve 5 opens, causing water to circulate between water tank 3, water pump II 4, solenoid valve 5, and finned tube heat exchanger 7: water in water tank 3 flows into finned tube heat exchanger 7 through water pump II 4 and solenoid valve 5, where heat is transferred from the water to the air, and the water returns to water tank 3 after heat exchange.

[0034] The water temperature setting range is 5℃ to 10℃ higher than the ambient temperature. The specific value should be set within the range according to actual needs.

[0035] When the electromagnetic relay II13 is activated, the blower 6 delivers cold air into the finned tube heat exchanger 7. After absorbing heat from the finned tube heat exchanger 7, the cold air enters the ventilation shaft 8. Inside the ventilation shaft 8, the hot air rises along the spiral column 802, passes through the filter screen 805, and enters the grain pile to dry the grain.

[0036] Server 14 sends control commands through the GPRS communication module. After being received by receiver 15, the commands are transmitted to controller 16. After receiving the control signals, controller 16 controls the on / off state of electromagnetic relay I 12 and electromagnetic relay II 13, thereby controlling the operation of water circulation I, water circulation II and fan 6.

[0037] Photovoltaic panel 9 converts solar energy into electrical energy, generating direct current (DC). This DC power is regulated by photovoltaic controller 10 and then stored in battery 11, providing operating power for the entire system. Electromagnetic relay I 12 is connected to water pump I 2, providing circulation power for water circulation I; electromagnetic relay II 13 is connected to water pump II 4, solenoid valve 5, and fan 6, providing circulation power for water circulation II and controlling the operation of fan 6.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A granary drying system comprising a thermal collection drying system, an automatic control system, a solar power generation system, characterized in that: The heat collecting and drying system is composed of a flat-plate solar heat collector (1), a water pump I (2), a water tank (3), a water pump II (4), an electromagnetic valve (5), a fan (6), a finned tube heat exchanger (7), and a ventilation vertical cylinder (8); the ventilation vertical cylinder (8) is composed of a vertical cylinder end cover (801), a spiral column (802), a cross ring (803), a ventilation pipeline (804), and a filter screen (805); the spiral of the spiral column (802) is a variable pitch spiral, the pitch of the variable pitch spiral gradually increases from bottom to top along the axial direction of the spiral column; the spiral column (802) is located inside the filter screen (805), the vertical cylinder end cover (801) is a circular plate, the upper end of the filter screen (805) is welded with the vertical cylinder end cover (801), the lower end of the filter screen (805) is welded with the bottom of the granary, the top end of the spiral column (802) is welded at the center of the vertical cylinder end cover (801), the circular ring of the cross ring (803) is welded with the air outlet of the ventilation pipeline (804), and the bottom end of the spiral column (802) is welded at the cross center of the cross ring (803); the water outlet of the flat-plate solar heat collector (1) is communicated with the water inlet of the water pump I (2), the water outlet of the water pump I (2) is communicated with the water inlet of the water tank (3), the water outlet of the water tank (3) is divided into two paths, one path is communicated with the water inlet of the flat-plate solar heat collector (1), and the other path is communicated with the water inlet of the water pump II (4), the water outlet of the water pump II (4) is communicated with the water inlet of the electromagnetic valve (5), the water outlet of the electromagnetic valve (5) is communicated with the water inlet (701) of the finned tube heat exchanger, and the water outlet (702) of the finned tube heat exchanger is communicated with the water inlet of the water tank (3).

2. The grain drying system of claim 1, wherein, The automatic control system is composed of an electromagnetic relay I (12), an electromagnetic relay II (13), a server (14), a receiver (15), and a controller (16); the server (14) is connected with the receiver (15) through wireless connection, the receiver (15) is connected with the controller (16) through wires, the controller (16) is connected with the electromagnetic relay I (12) through wires, and the controller (16) is connected with the electromagnetic relay II (13) through wires.

3. The grain drying system of claim 1, wherein, The solar power generation system is composed of a photovoltaic panel (9), a photovoltaic controller (10), and a storage battery (11); the photovoltaic panel (9) is connected with the photovoltaic controller (10), the photovoltaic controller (10) is connected with the storage battery (11), and the storage battery (11) provides power for the fan (6), the water pump I (2), the water pump II (4), and the electromagnetic valve (5).

4. The grain drying system of claim 1, wherein, The fan (6) is fixed at the air inlet (703) of the finned tube heat exchanger, and the air inlet of the ventilation pipeline (804) is communicated with the air outlet (704) of the finned tube heat exchanger.

5. The grain drying system of claim 1, wherein, The storage battery (11) supplies power for the water pump I (2), the water pump II (4), the electromagnetic valve (5), and the fan (6), the electromagnetic relay I (12) controls the switch of the water pump I (2), and the electromagnetic relay II (13) controls the switches of the water pump II (4), the electromagnetic valve (5), and the fan (6).

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