Air source heat pump unit for grain quality-guaranteeing drying

Abstract

The invention relates to the technical field of heat pump drying, and discloses an air source heat pump unit for grain quality guarantee drying, the air source heat pump unit comprises a first unit, a second unit and a heat conduction rod, a first condenser and a compressor are respectively installed in the first unit, and a second condenser, a first air compressor and a second air compressor are respectively installed in the second unit; the heat conduction rod comprises a center pipe and an outer shell of a double-layer structure, the center pipe is fixedly installed in the outer shell, a fresh air hole is formed in the surface of the center pipe, a plurality of exhaust holes are formed in the surface of the outer shell, and the flow of the exhaust holes is controlled through the control assembly. According to the air source heat pump unit, the heat conduction rods are arranged in the drying bin, high-temperature and high-pressure gas is input into surrounding grains through the heat conduction rods, moisture of the grains is taken away, the drying purpose is achieved, the high-temperature and high-pressure gas has good penetrability, the grains do not need to be turned over, local high temperature can be prevented from damaging the grains, the workload is greatly reduced, and the working efficiency is improved. And convenience is provided for efficient drying production.

Description

Technical Field

[0001] The invention relates to the technical field of heat pump drying, and in particular to an air source heat pump unit for drying grains for quality preservation. Background Art

[0002] Air energy heat pump dryer is a new type of drying device, which mainly uses the reverse Carnot principle. The gas Freon is pressurized by the compressor to become a high-temperature and high-pressure gas (temperature up to 100°C), and enters the heat exchanger (condenser) on the indoor side. The refrigerant condenses and liquefies to release high-temperature heat to heat the air in the drying room. As in the prior art, the patent document with announcement number CN106369959B discloses an air energy heat pump agricultural product drying device, which consists of an air source heat pump outdoor main unit, a total heat exchanger, a fan, a condenser, a material tray, a drying box shell, a wind shield, an exhaust duct, an air supply duct, an air supply static pressure chamber, and a return air static pressure chamber. The outdoor main unit of the air source heat pump includes three air volume regulating valves and two groups of evaporators; the two groups of evaporators are connected in parallel and connected in series with the condenser through the refrigerant pipeline to form a part of the refrigeration cycle; the outdoor fresh air processed by the outdoor main unit of the air source heat pump is sent into the outer shell of the drying box after heat exchange with the exhaust air in the full heat exchanger; the fan 1 provides the power for the air to circulate in the outer shell of the drying box; wind shields are installed at appropriate positions in front and behind the material tray to obtain the required air flow route in the material tray. The invention can realize three drying conditions of agricultural products, namely single heating, low-temperature dehumidification, and heating and dehumidification, and can also achieve uniform wind speed of the material tray, thereby improving energy utilization efficiency and uniformity of agricultural product drying.

[0003] During the drying process of materials such as rice and wheat, the drying device used needs to turn the materials to ensure uniform heat conduction of the hot air. Otherwise, the hot air will find it difficult to pass through the gaps between the grains and take away moisture, or the local temperature will be too high and damage the grains. Improper drying speed and temperature will not only cause serious loss of grain quality, but also lead to increased drying energy consumption and rising drying costs. The drying process will have a certain impact on the quality of the grains. Based on this, the existing drying device has the problem of needing to turn the materials during drying, which requires a large workload and high energy consumption, and needs further improvement. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing drying device needs to turn the material for drying, has the disadvantages of large workload and high energy consumption, and proposes an air source heat pump unit for grain quality preservation drying.

[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: an air source heat pump unit for grain quality preservation and drying, comprising a first unit, a second unit and a heat conducting rod, wherein a first condenser and a compressor are installed in the first unit, and a second condenser, a first air compressor and a second air compressor are installed in the second unit; The heat conducting rod comprises a central tube and a double-layer outer shell, wherein the central tube is fixedly installed in the outer shell, a fresh air hole is provided on the surface of the central tube, a plurality of exhaust holes are provided on the surface of the outer shell, and a plurality of control components are provided between the central tube and the outer shell, and the flow of the exhaust holes is controlled by the control components; Several heat-conducting rods are fixedly installed in the drying bin in a rectangular array. The compressor circulates the refrigerant medium into the interlayer cavity of the outer shell. The first air compressor draws the air in the drying bin and inputs it into the outer shell. The second air compressor inputs fresh air into the central tube. High-temperature and high-pressure gas is input to the surrounding grains through the heat-conducting rods distributed throughout the drying bin to take away the moisture in the grains, thereby achieving the purpose of drying. There is no need to turn the grains over, which greatly reduces the workload and facilitates efficient drying production.

[0006] Preferably, the control component includes a fairing sleeve and an adjustment sleeve, the fairing sleeve is fixedly mounted on the inner wall of the outer shell, the adjustment sleeve is slidably mounted on the outer surface of the center tube, and the adjustment sleeve is movably arranged in the fairing sleeve, the bottom of the adjustment sleeve is a conical structure, and the bottom end hole of the fairing sleeve is a conical step hole structure, so that the conical bottom end of the adjustment sleeve can be movably inserted into the bottom end step hole of the fairing sleeve.

[0007] A first chamber is provided inside the fairing sleeve, the exhaust hole is connected to the first chamber, an input hole and a first flow channel opening are respectively provided on the inner wall of the fairing sleeve, both the input hole and the first flow channel opening are connected to the first chamber, a second chamber is provided inside the adjusting sleeve, the fresh air hole is connected to the second chamber, a second flow channel opening connected to the second chamber is provided on the surface of the adjusting sleeve, the first flow channel opening and the second flow channel opening are staggered in the up and down directions, the conical bottom end of the adjusting sleeve covers the mouth of the input hole, and the ratio of fresh air to recycled high-temperature gas can be adjusted due to the control component, so as to achieve the purpose of energy saving and consumption reduction.

[0008] Preferably, the outer surface of the adjustment sleeve is provided with a plurality of connecting grooves, and a plurality of control components are arranged in the outer shell to divide the inner cavity of the outer shell into a plurality of unit air cavities, and adjacent unit air cavities are connected through the connecting grooves.

[0009] Preferably, a plurality of fixed sleeves are fixedly installed on the surface of the central tube, the top of the adjusting sleeve is slidably connected to the inner hole of the fixing sleeve, a return spring is arranged inside the fixing sleeve, the bottom end of the return spring is pressed against the top of the adjusting sleeve, a third chamber is opened inside the adjusting sleeve, a magnetic ring is slidably installed in the third chamber, a sliding rod is fixedly installed on the lower side of the magnetic ring, and the sliding rod extends downward to the bottom end of the adjusting sleeve.

[0010] An electromagnetic coil is arranged inside the fixed sleeve, and a tension spring is fixedly installed inside the adjusting sleeve. The tension spring pulls the magnetic ring upward, and the electromagnetic coil generates a force that repels the magnetic ring, so that the sliding rod slides downward and its bottom end can be inserted into the input hole. Since the control component has the function of controlling the opening and closing of the exhaust hole and the function of using the air pressure change to drive the control component to move, the air pressure of multiple chambers in the heat conducting rod is gradually reduced from bottom to top. By controlling the input air pressure of the heat conducting rod, the flow adjustment of the exhaust holes at different buried depths can be realized, so as to achieve the purpose of fully utilizing the thermal energy and reducing energy consumption.

[0011] Preferably, a partition is fixedly installed in the interlayer cavity of the outer shell, and the partition divides the interlayer cavity of the outer shell into two left and right chambers that are interconnected. Two first joint pipes are fixedly installed at the bottom end of the outer shell, and the two first joint pipes are respectively connected to the two left and right chambers that are interconnected. A second joint pipe is fixedly installed at the bottom end of the outer shell, and the second joint pipe is connected to the inner cavity of the outer shell. The compressor works on the refrigerant medium to generate high-temperature and high-pressure gas refrigerant, which is circulated and input into the interlayer cavity of the outer shell to provide heat energy for the drying process.

[0012] Preferably, blowers are fixedly installed in the first unit and the second unit, a feeding pipe and a discharge valve are fixedly installed at the upper and lower ends of the drying bin respectively, a first output air duct and a second output air duct are fixedly installed on the upper end surface of the drying bin, and the second output air duct is connected to the air inlet end of the first air compressor.

[0013] The present invention has the following beneficial effects: 1. The air source heat pump unit makes the operation of drying materials more convenient. By setting a heat conducting rod in the drying bin, the heat conducting rod inputs high-temperature and high-pressure gas to the surrounding grains, taking away the moisture of the grains to achieve the purpose of drying. The high-temperature and high-pressure gas has good penetrability, and there is no need to turn the grains. It can also prevent local high temperature from damaging the grains, greatly reducing the workload and providing convenience for efficient drying production.

[0014] 2. From the perspective of energy saving, this air source heat pump unit is superior to the existing ordinary heat pump dryer, as follows: (1) As is known to all, drying is a process of heating and cooling, that is, the hot air flow heats the grains, the moisture in the grains evaporates, and the water vapor is input into the dehumidification system along with the hot air flow. The dehumidification system then cools the high-temperature and high-humidity air to liquefy the water vapor and discharge it. That's all. A large amount of heat is lost during the dehumidification process, and the energy consumption is high. The air source heat pump unit proposed in the present invention has a central tube arranged in the heat conducting rod, and fresh air is injected into the drying bin through the fresh air holes on the surface of the central tube. The fresh air is mixed with part of the hot air discharged from the top of the drying bin, so that the heat can be recycled and the relative humidity of the mixed air is reduced, which is conducive to the rapid heating of the drying bin and improves the drying efficiency. (2) By arranging a plurality of control components between the central tube and the outer shell, the flow rate of the exhaust hole is controlled by the control components. At the same time, the ratio of fresh air to (recycled) high-temperature gas is controlled. When the moisture content of the grain is high, the air pressure input into the outer shell is increased, and the ratio of fresh air to (recycled) high-temperature gas is increased, that is, the input amount of fresh air is increased, and rapid dehumidification is achieved; when the moisture content of the grain is low, the air pressure input into the outer shell is reduced, and the ratio of fresh air to (recycled) high-temperature gas is reduced, that is, the input amount of fresh air is reduced, so that the drying bin is heated up quickly, and the purpose of rapid drying of the grain is achieved. That is, by controlling the input air pressure of the heat conducting rod, the ratio of fresh air to (recycled) high-temperature gas is adjusted to meet the drying requirements of grains with different humidity levels, thereby achieving the purpose of energy saving and consumption reduction.

[0015] (3) A plurality of control components are arranged in the heat conductive rod, and the inner cavity of the heat conductive rod is divided into a plurality of chambers. Since the control component has the function of controlling the opening and closing of the exhaust hole and the function of using the air pressure change to drive the control component to operate, the air pressure of the plurality of chambers in the heat conductive rod is gradually reduced from bottom to top, so as to adapt to the drying requirements of grains with different buried depths in the drying bin. When the amount of grain is small, the buried depth of the heat conductive rod is small, and the air pressure requirement of the exhaust hole is reduced. When the amount of grain is large, the buried depth of the heat conductive rod is large, and the air pressure requirement of the exhaust hole is increased. By controlling the input air pressure of the heat conductive rod, the flow rate of the exhaust holes at different buried depths can be adjusted, so as to achieve the purpose of fully utilizing the heat energy and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the heat pump unit proposed by the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the heat conducting rod proposed by the present invention; Figure 3 This is a schematic diagram of the internal structure of the heat conducting rod proposed by the present invention; Figure 4 It is a partial cutaway schematic diagram of the fairing sleeve and the regulating sleeve proposed in the present invention; Figure 5 This is a schematic diagram of the partial cross-section structure of the adjustment sleeve proposed by the present invention; Figure 6 It is a schematic diagram of a partial cross-sectional structure of the heat conducting rod proposed by the present invention; Figure 7 This is a schematic diagram of the front cross-section structure of the heat pump unit proposed by the present invention (I); Figure 8 This is a schematic diagram of the front cross-section structure of the heat pump unit proposed by the present invention (II); Fig. 9 This is a schematic diagram of the front cross-section structure of the heat pump unit proposed in the present invention (III).

[0017] In the figure: 1 the first unit, 2 the second unit, 3 the heat conducting rod, 4 the first condenser, 5 the compressor, 6 the second condenser, 7 the first air compressor, 8 the second air compressor, 9 the center tube, 10 the outer shell, 11 the exhaust hole, 12 the fresh air hole, 13 the drying chamber, 14 the rectifying sleeve, 15 the adjusting sleeve, 16 the input hole, 17 the first flow channel opening, 18 the second flow channel opening, 19 the connecting groove, 20 the fixing sleeve, 21 the return spring, 22 the magnetic ring, 23 the sliding rod, 24 the electromagnetic coil, 25 the tension spring, 26 the partition, 27 the first joint pipe, 28 the second joint pipe, 29 the feeding pipe, 30 the discharge valve, 31 the first output air duct, 32 the second output air duct, 33 the blower. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the present invention.

[0020] Reference Figure 1-9 An air source heat pump unit for grain quality preservation and drying comprises a first unit 1, a second unit 2 and a heat conducting rod 3, wherein a first condenser 4 and a compressor 5 are installed in the first unit 1. Figure 7 As shown, the second unit 2 is equipped with a second condenser 6, a first air compressor 7 and a second air compressor 8. Figure 8 , 9 shown.

[0021] See Figure 2 , 3 4. The heat conducting rod 3 includes a central tube 9 and an outer shell 10 with a double-layer structure. The central tube 9 is fixedly installed in the outer shell 10. A fresh air hole 12 is opened on the surface of the central tube 9. A plurality of exhaust holes 11 are opened on the surface of the outer shell 10. A plurality of control components are arranged between the central tube 9 and the outer shell 10, and the flow of the exhaust hole 11 is controlled by the control components.

[0022] Among them, the control component includes a fairing sleeve 14 and an adjustment sleeve 15. The fairing sleeve 14 is fixedly installed on the inner wall of the outer shell 10, and the adjustment sleeve 15 is slidably installed on the outer surface of the center tube 9, and the adjustment sleeve 15 is movably arranged in the fairing sleeve 14. The bottom of the adjustment sleeve 15 is a conical structure, and the bottom end hole of the fairing sleeve 14 is a conical step hole structure, so that the conical bottom end of the adjustment sleeve 15 can be movably inserted into the bottom end step hole of the fairing sleeve 14.

[0023] A first chamber is provided inside the fairing sleeve 14, and the exhaust hole 11 is connected to the first chamber. An input hole 16 and a first flow channel opening 17 are respectively provided on the inner wall of the fairing sleeve 14, and both the input hole 16 and the first flow channel opening 17 are connected to the first chamber. A second chamber is provided inside the adjusting sleeve 15, and the fresh air hole 12 is connected to the second chamber. A second flow channel opening 18 connected to the second chamber is provided on the surface of the adjusting sleeve 15, and the first flow channel opening 17 and the second flow channel opening 18 are staggered in the up and down directions, and the conical bottom end of the adjusting sleeve 15 covers the mouth of the input hole 16.

[0024] The outer surface of the adjustment sleeve 15 is provided with a plurality of communication grooves 19 . A plurality of control components are arranged in the outer shell 10 , and the inner cavity of the outer shell 10 is divided into a plurality of unit air cavities. Adjacent unit air cavities are connected through the communication grooves 19 .

[0025] A plurality of fixing sleeves 20 are fixedly installed on the surface of the central tube 9 . The top of the adjusting sleeve 15 is a hexagonal structure and is slidably connected to the inner hole of the fixing sleeve 20 . A return spring 21 is arranged inside the fixing sleeve 20 , and the bottom end of the return spring 21 is pressed against the top of the adjusting sleeve 15 .

[0026] A third chamber is provided inside the adjusting sleeve 15 , in which a magnetic ring 22 is slidably mounted. A sliding rod 23 is fixedly mounted on the lower side of the magnetic ring 22 , and the sliding rod 23 extends downward to the bottom end of the adjusting sleeve 15 .

[0027] The interior of the fixed sleeve 20 is provided with an electromagnetic coil 24, and the interior of the adjusting sleeve 15 is fixedly installed with a tension spring 25, which pulls the magnetic ring 22 upward. Under normal conditions, under the tension of the tension spring 25, the sliding rod 23 is retracted in the adjusting sleeve 15. When the electromagnetic coil 24 generates a repulsive force with the magnetic ring 22, the sliding rod 23 slides downward and the bottom end of the sliding rod 23 can be inserted into the input hole 16. Figure 4 .

[0028] A plurality of heat-conducting rods 3 are fixedly installed in a rectangular array in the drying bin 13 , the compressor 5 circulates the refrigerant medium into the interlayer cavity of the outer shell 10 , the first air compressor 7 draws the air in the drying bin 13 and inputs it into the outer shell 10 , and the second air compressor 8 inputs fresh air into the central tube 9 .

[0029] Specifically, a partition 26 is fixedly installed in the interlayer cavity of the outer shell 10, and the partition 26 divides the interlayer cavity of the outer shell 10 into two left and right chambers that are interconnected. Two first joint pipes 27 are fixedly installed at the bottom end of the outer shell 10, and the two first joint pipes 27 are respectively connected to the left and right chambers that are interconnected. A second joint pipe 28 is fixedly installed at the bottom end of the outer shell 10, and the second joint pipe 28 is connected to the inner cavity of the outer shell 10. Figure 2 .

[0030] A blower 33 is fixedly installed in the first unit 1 and the second unit 2, a feeding pipe 29 and a discharge valve 30 are fixedly installed at the upper and lower ends of the drying bin 13 respectively, a first output air duct 31 and a second output air duct 32 are fixedly installed on the upper end surface of the drying bin 13, and the second output air duct 32 is connected to the air inlet end of the first air compressor 7.

[0031] The operating principle of the air source heat pump unit: a. Figure 7 As shown, the compressor 5 performs work on the refrigerant medium, generates a high-temperature and high-pressure gas refrigerant, and inputs it into the interlayer cavity of the outer shell 10 (as shown in FIG. Figure 6 As shown in CC in the middle), heat energy is released, and then the low-temperature refrigerant flows into the first condenser 4 and the second condenser 6, absorbs the heat of the hot air, and finally flows back to the compressor 5, circulating to provide heat energy for the heat-conducting rod 3; b. Figure 8 As shown, the first air compressor 7 injects pressurized air into the second joint pipe 28, and the air pushes the regulating sleeve 15 upward, enters from the input hole 16, and is discharged from the exhaust hole 11 (as shown in FIG. Figure 6 As shown at BB in the middle, this process absorbs the heat of the high-temperature and high-pressure refrigerant, and the high-temperature air discharged from the exhaust hole 11 heats the grains to evaporate the water, and the water vapor and hot air are discharged from the first output air duct 31 and the second output air duct 32 respectively. A part of the high-humidity hot air is transported to the dehumidification system from the first output air duct 31 (the dehumidification system does not belong to the protection scope of the present invention and is not introduced here), and the other part of the high-humidity air is transported to the first air compressor 7 from the second joint pipe 28, and then transported to the drying bin 13 for recycling; It should be noted that the pressurized air injected into the outer shell 10 is transported to the top of the inner cavity of the outer shell 10 (such as Figure 6As shown at DD in the middle, the outer shell 10 is in a pressure-maintaining state, and the air density is large, which can better absorb the heat of the high-temperature and high-pressure refrigerant medium. The air pressure in the outer shell 10 is decreasing from bottom to top. When the air pressure is less than the pressure of the return spring 21, the air pressure cannot lift the adjustment sleeve 15, and the input hole 16 is blocked by the adjustment sleeve 15, so that the corresponding exhaust hole 11 is in a closed state. Moreover, this design makes the exhaust air pressure of the lower exhaust hole 11 greater than that of the upper exhaust hole 11, because the lower exhaust hole 11 is buried deeper by the grains, and a larger air pressure is required to meet the requirements of jet drying of the grains. The upper exhaust hole 11 is buried shallower by the grains, and the exhaust air pressure is appropriately reduced, and the hot air flow rate is reduced, so that the heat energy can be fully utilized; At the same time, current can be introduced into the electromagnetic coil 24, and the electromagnetic coil 24 generates a repulsive force with the magnetic ring 22, so that the sliding rod 23 slides downward and its bottom end can be inserted into the input hole 16, or the input hole 16 can be closed, thereby closing the discharge of hot air for drying; c. Fig. 9 As shown, the second air compressor 8 inputs room temperature dry fresh air into the central tube 9, and the fresh air flows into the first chamber in the fairing sleeve 14 through the fresh air hole 12, the first flow channel opening 17 and the second flow channel opening 18, and is finally discharged from the exhaust hole 11 (as shown in FIG. Figure 6 As shown at AD in FIG. 1 ), since the adjusting sleeve 15 can move up and down, the overlapping conduction area of ​​the first flow channel opening 17 and the second flow channel opening 18 is variable. Figure 4 The more the adjusting sleeve 15 moves upward, the larger the conduction area of ​​the first flow channel opening 17 and the second flow channel opening 18 is, so that the input amount of fresh air is increased, and the ratio of fresh air to recycled high-temperature gas can be adjusted.

[0032] As we all know, drying is a process of heating and cooling, that is, the hot air flow heats the grains, the moisture in the grains evaporates, and the water vapor is input into the dehumidification system along with the hot air flow. The dehumidification system then cools down the high-temperature and high-humidity air to liquefy the water vapor and discharge it. If that is all, a large amount of heat will be lost in the dehumidification process and the energy consumption will be high. This is common knowledge and will not be elaborated on here.

[0033] The air source heat pump unit proposed by the present invention has a central tube 9 disposed inside the heat conducting rod 3, and fresh air is injected into the drying chamber 13 through the fresh air holes 12 on the surface of the central tube 9. The fresh air is mixed with part of the hot air discharged from the top of the drying chamber 13, so that the heat can be recycled and the relative humidity of the mixed air is reduced, which is conducive to the rapid heating of the drying chamber 13 and improves the drying efficiency. By arranging a plurality of control components between the central tube 9 and the outer shell 10, the control components are used to control the flow of the exhaust hole 11. At the same time, it has the function of controlling the ratio of fresh air to recycled high-temperature gas. When the moisture content of the grain is high, the air pressure input to the outer shell 10 is increased, and the ratio of fresh air to recycled high-temperature gas is increased, that is, the input amount of fresh air is increased, and rapid dehumidification is achieved; when the moisture content of the grain is low, the air pressure input to the outer shell 10 is reduced, and the ratio of fresh air to recycled high-temperature gas is reduced, that is, the input amount of fresh air becomes smaller, so that the drying bin 13 is quickly heated up, and the purpose of rapid drying of the grain is achieved. That is, by controlling the input air pressure of the heat conducting rod 3, the ratio of fresh air to recycled high-temperature gas is adjusted to meet the drying requirements of grains with different humidity levels, thereby achieving the purpose of energy saving and consumption reduction.

[0034] A plurality of control components are arranged in the heat conducting rod 3, and the inner cavity of the heat conducting rod 3 is divided into a plurality of chambers. Since the control component has the function of controlling the opening and closing of the exhaust hole 11, and the function of using the air pressure change to drive the control component to operate, the air pressure of the plurality of chambers in the heat conducting rod 3 is gradually reduced from bottom to top, so as to adapt to the drying requirements of grains with different buried depths in the drying bin 13. When the amount of grain is small, the buried depth of the heat conducting rod 3 is small, and the air pressure requirement of the exhaust hole 11 is reduced. When the amount of grain is large, the buried depth of the heat conducting rod 3 is large, and the air pressure requirement of the exhaust hole 11 is increased. By controlling the input air pressure of the heat conducting rod 3, the flow regulation of the exhaust hole 11 at different buried depths can be realized, so as to achieve the purpose of fully utilizing heat energy and reducing energy consumption.

[0035] To sum up, the air source heat pump unit is not only more energy-efficient in drying grains, but also more convenient in the operation of drying materials. By arranging heat-conducting rods 3 in the drying bin 13, the heat-conducting rods 3 distributed throughout the drying bin 13 input high-temperature and high-pressure gas to the surrounding grains, thereby taking away moisture from the grains and achieving the purpose of drying. The ratio of the high-temperature and high-pressure gas to the fresh air is controllable and has good permeability, so that it has a suitable drying speed and temperature. There is no need to turn the grains over, and local high temperature can be prevented from damaging the grains, which greatly reduces the workload and provides convenience for efficient drying production.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An air source heat pump unit for grain quality preservation and drying, comprising a first unit (1), a second unit (2) and a heat conducting rod (3), characterized in that: The first unit (1) is equipped with a first condenser (4) and a compressor (5), and the second unit (2) is equipped with a second condenser (6), a first air compressor (7) and a second air compressor (8); The heat conducting rod (3) comprises a central tube (9) and an outer shell (10) of a double-layer structure, wherein the central tube (9) is fixedly installed in the outer shell (10), a fresh air hole (12) is provided on the surface of the central tube (9), a plurality of exhaust holes (11) are provided on the surface of the outer shell (10), and a plurality of control components are provided between the central tube (9) and the outer shell (10), and the flow rate of the exhaust holes (11) is controlled by the control components; A plurality of heat conducting rods (3) are fixedly installed in a drying chamber (13) in a rectangular array, a compressor (5) circulates a refrigerant medium into the interlayer cavity of the outer shell (10), a first air compressor (7) draws air from the drying chamber (13) and inputs it into the outer shell (10), and a second air compressor (8) inputs fresh air into the central tube (9).

2. The air source heat pump unit for grain quality preservation and drying according to claim 1, characterized in that: The control assembly comprises a fairing sleeve (14) and an adjusting sleeve (15), wherein the fairing sleeve (14) is fixedly mounted on the inner wall of the outer shell (10), and the adjusting sleeve (15) is slidably mounted on the outer surface of the central tube (9), and the adjusting sleeve (15) is movably arranged in the fairing sleeve (14), the bottom of the adjusting sleeve (15) is in a conical structure, and the bottom end hole of the fairing sleeve (14) is in a conical step hole structure, so that the conical bottom end of the adjusting sleeve (15) can be movably inserted into the bottom end step hole of the fairing sleeve (14).

3. The air source heat pump unit for grain quality preservation and drying according to claim 2, characterized in that: The fairing sleeve (14) is provided with a first chamber inside, the exhaust hole (11) is connected to the first chamber, the inner wall of the fairing sleeve (14) is provided with an input hole (16) and a first flow channel opening (17), both of which are connected to the first chamber, the regulating sleeve (15) is provided with a second chamber inside, the fresh air hole (12) is connected to the second chamber, the surface of the regulating sleeve (15) is provided with a second flow channel opening (18) connected to the second chamber, the first flow channel opening (17) and the second flow channel opening (18) are arranged staggered in the vertical direction, and the conical bottom end of the regulating sleeve (15) covers the mouth of the input hole (16).

4. The air source heat pump unit for grain quality preservation and drying according to claim 3, characterized in that: The outer surface of the adjustment sleeve (15) is provided with a plurality of communication grooves (19), and a plurality of control components are arranged in the outer shell (10) to divide the inner cavity of the outer shell (10) into a plurality of unit air cavities, and adjacent unit air cavities are connected via the communication grooves (19).

5. The air source heat pump unit for grain quality preservation and drying according to claim 4, characterized in that: A plurality of fixing sleeves (20) are fixedly mounted on the surface of the central tube (9); the top end of the adjusting sleeve (15) is slidably connected to the inner hole of the fixing sleeve (20); a return spring (21) is arranged inside the fixing sleeve (20); the bottom end of the return spring (21) is pressed against the top end of the adjusting sleeve (15).

6. The air source heat pump unit for grain quality preservation and drying according to claim 5, characterized in that: A third chamber is provided inside the adjusting sleeve (15), a magnetic ring (22) is slidably mounted in the third chamber, a sliding rod (23) is fixedly mounted on the lower side of the magnetic ring (22), and the sliding rod (23) extends downward to the bottom end of the adjusting sleeve (15).

7. The air source heat pump unit for grain quality preservation and drying according to claim 6, characterized in that: An electromagnetic coil (24) is arranged inside the fixing sleeve (20), and a tension spring (25) is fixedly installed inside the adjusting sleeve (15). The tension spring (25) pulls the magnetic ring (22) upward, and the electromagnetic coil (24) generates a repulsive force with the magnetic ring (22), so that the sliding rod (23) slides downward and the bottom end of the sliding rod (23) can be inserted into the input hole (16).

8. An air source heat pump unit for grain quality preservation and drying according to any one of claims 1 to 7, characterized in that: A partition plate (26) is fixedly installed in the interlayer cavity of the outer shell (10), and the partition plate (26) divides the interlayer cavity of the outer shell (10) into two left and right chambers that are interconnected. Two first joint pipes (27) are fixedly installed at the bottom end of the outer shell (10), and the two first joint pipes (27) are respectively connected to the two left and right chambers that are interconnected. A second joint pipe (28) is fixedly installed at the bottom end of the outer shell (10), and the second joint pipe (28) is connected to the inner cavity of the outer shell (10).

9. The air source heat pump unit for grain quality preservation and drying according to claim 8, characterized in that: A blower (33) is fixedly installed in both the first unit (1) and the second unit (2); a feeding pipe (29) and a discharge valve (30) are fixedly installed at the upper and lower ends of the drying bin (13), respectively; a first output air duct (31) and a second output air duct (32) are fixedly installed on the upper end surface of the drying bin (13); and the second output air duct (32) is connected to the air inlet end of the first air compressor (7).

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