Movable grain heat pump dryer

Abstract

The utility model discloses a movable grain heat pump dryer which comprises a box body, a drying bin and an equipment bin are arranged in the box body, a control device and a dehumidification heat pump unit are installed in the equipment bin, a first pipe body, an inner barrel and an outer barrel which are coaxially distributed in the vertical direction are arranged in the drying bin, and ventilation holes are evenly distributed in the surface of the inner barrel and the surface of the outer barrel. The bottom of the first pipe body is connected with a grain feeding and discharging device, and a lifting screw is rotationally arranged in the first pipe body; a grain drying cavity is defined by the inner barrel and the outer barrel, a grain guide-out opening is formed in the upper portion of the first pipe body, and a grain guide-in opening is formed in the lower portion of the first pipe body; a hot air input cavity is defined by the inner barrel and the first pipe body, the inner barrel is connected with an air inlet pipe, and the air inlet pipe is connected with an air outlet of the dehumidification heat pump unit through a fan. An air return opening is formed in the lower portion of the side wall of the drying bin and connected with an air return opening of the dehumidification heat pump unit through a filter cartridge dust removal device. The grain dryer has the advantages of being high in grain drying efficiency, convenient to move and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of dryers, in particular to a mobile grain heat pump dryer. Background Art

[0002] Hot air is mostly used for drying high-moisture grains. The energy sources for hot air heating are mostly coal, biomass, natural gas, fuel oil, etc. Its environmental protection problems and operating costs have always attracted the attention of the government, enterprises and the public.

[0003] Currently, some products also adopt heat pump dehumidification technology. For example, CN115654858A discloses a small grain dryer, which dries grains by providing hot air in the way of replacing coal with electricity. However, the applicant found that the small grain dryer has the following problems:

[0004] (1) Adopting the structural form of a drying tower is not conducive to handling and moving to change the position;

[0005] (2) Grains are added from the upper end of the drying tower, and during the drying process of the grains in the drying tower, the grains are piled up inside the drying tower. Due to the lack of agitation of the grains, the water vapor generated after the hot air contacts the grains cannot be volatilized and discharged thoroughly, affecting the grain drying efficiency.

[0006] Therefore, there is an urgent need for a drying device that is easy to move and can efficiently dry grains. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a mobile grain heat pump dryer, which can quickly dry grains according to user requirements, has the advantages of energy conservation, environmental protection, simple structure, good drying effect, easy maintenance, reliable performance, etc., and is easy to move, solving the problems that the existing grain dryers are inconvenient to move and the grain drying efficiency is not high enough.

[0008] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0009] A mobile grain heat pump dryer, comprising a box body, inside which there are a drying bin and an equipment bin. The equipment bin is equipped with a control device and a dehumidification heat pump unit. Inside the drying bin, there are a first pipe body, an inner cylinder, and an outer cylinder coaxially distributed along the vertical direction. The surfaces of the inner cylinder and the outer cylinder are both distributed with air-permeable ventilation holes. The inner cylinder is located between the first pipe body and the outer cylinder. The bottom of the first pipe body is connected to a grain inlet and outlet device. Inside the first pipe body, there is a lifting screw rotatably arranged and connected to the grain inlet and outlet device. A grain drying chamber is formed between the inner cylinder and the outer cylinder. The upper part of the first pipe body is provided with a grain outlet communicating with the upper part of the grain drying chamber, and the lower part of the first pipe body is provided with a grain inlet communicating with the lower part of the grain drying chamber. A hot air input chamber is formed between the inner cylinder and the first pipe body. The inner cylinder is connected to an air inlet pipe communicating with the hot air input chamber. The air inlet pipe is connected to the air outlet of the dehumidification heat pump unit through a fan. The lower part of the side wall of the drying bin near the equipment bin is provided with a return air port, and the return air port is connected to the return air port of the dehumidification heat pump unit through a filter cartridge dust removal device.

[0010] Further, a deflector is provided at the upper end of the lifting screw corresponding to the position of the grain outlet.

[0011] Further, the grain inlet and outlet device includes a second pipe body and an inlet and outlet screw. The second pipe body is horizontally installed at the bottom of the box body. The inlet and outlet screw is rotatably installed inside the second pipe body. One end of the second pipe body is connected to the lower part of the first pipe body through an elbow pipe fitting. Inside the elbow pipe fitting, there is an elbow transmission assembly for power transmission connection with the inlet and outlet screw and the lifting screw respectively. The inlet and outlet screw is connected with a driving mechanism at the end far from the elbow transmission assembly. The upper part of the side wall of the second pipe body is provided with a feed hopper, and the lower part of the side wall of the second pipe body is provided with a discharge assembly.

[0012] Further, the discharge assembly includes a slot provided at the lower part of the side wall of the second pipe body and a discharge plug inserted into the slot.

[0013] Further, the driving mechanism includes a driving wheel, a driven wheel, a belt, and a motor. The driven wheel is connected to the inlet and outlet screw. The driving wheel is connected to the output end of the motor. The belt is connected to the driving wheel and the driven wheel respectively.

[0014] Further, a first support rod is connected between the outer wall of the upper part of the first pipe body and the inner wall of the outer cylinder, and a second support rod is provided between the lower part of the inner cylinder and the inner wall of the outer cylinder.

[0015] Further, the outer cylinder includes an outer cylinder silo located at the upper part and an outer cylinder hopper located at the lower part. The bottom of the outer cylinder hopper is fixedly connected to the box body. The inner cylinder includes a lower inner cylinder section, a middle inner cylinder section, and an upper inner cylinder section that are distributed in sequence from bottom to top. The lower end of the lower inner cylinder section is connected to the outer wall of the first pipe body. The lower end of the middle inner cylinder section is connected to the upper end of the lower inner cylinder section. The upper end of the upper inner cylinder section is connected to the outer wall of the first pipe body.

[0016] Further, the outer cylinder silo is cylindrical, and the outer cylinder hopper is in the shape of an inverted cone. The middle inner cylinder section is cylindrical, the upper inner cylinder section is conical, and the lower inner cylinder section is in the shape of an inverted cone. There are diffusion channels for hot air to diffuse from the inside to the outside between the upper end of the middle inner cylinder section and the lower end of the upper inner cylinder section, and between the lower end of the middle inner cylinder section and the upper end of the lower inner cylinder section. The diameter of the lower end of the upper inner cylinder section is larger than the diameter of the upper end of the middle inner cylinder section.

[0017] Further, the cartridge dust removal device includes a dust removal chamber and a clean air chamber. The lower part of the dust removal chamber is communicated with the drying chamber through the air return port. The clean air chamber is located above the dust removal chamber. The clean air chamber is communicated with the air return port of the dehumidification heat pump unit. A number of filter cartridges are provided inside the dust removal chamber. The openings of the filter cartridges face vertically upward towards the clean air chamber. The clean air chamber is provided with a pulse jet device for blowing air in the reverse direction of the filter cartridges.

[0018] Further, the pulse jet device includes an air delivery pipe for delivering high-pressure gas, a pulse solenoid valve provided on the air delivery pipe, and a nozzle provided on the air delivery pipe and facing the filter cartridges.

[0019] Further, a level detection device for detecting the height of the grain in the grain drying chamber is provided on the top of the box body.

[0020] Further, the box body includes a chassis, a frame located above the chassis, and a sealing plate installed and connected to the frame. The outer surface of the sealing plate located on the outer periphery of the box body is provided with a heat preservation board.

[0021] Further, the bottom of the chassis is provided with towing wheels and a number of support legs with adjustable heights. A towing connector is provided at one end of the chassis.

[0022] Further, a movable maintenance door is provided on the side wall of the box body.

[0023] Further, a number of hanging ear plates are provided on the top of the box body. The hanging ear plates are provided with hanging holes.

[0024] Compared with the prior art, the present utility model provides a mobile grain heat pump dryer, which has the following beneficial effects:

[0025] The utility model adopts a fully enclosed design, and the entire drying process can be carried out under sealed environmental conditions without discharging gas into the external environment, thus avoiding secondary environmental pollution and saving more than 40% of energy. At the same time, the cartridge dust removal device is used to intercept and filter the dust, realizing dust-free emission during the drying process. In addition, by setting up the supporting wheels, support legs and trailer connectors, it can not only support well but also be conveniently moved and transported to change the position. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a schematic three-dimensional structure diagram of the whole of the present utility model;

[0028] Figure 2 It is a schematic three-dimensional structure diagram of the whole from another perspective of the present utility model;

[0029] Figure 3 It is an exploded view of the parts of the present utility model;

[0030] Figure 4 It is an assembly schematic diagram of the inner cylinder and the outer cylinder;

[0031] Figure 5 It is a schematic diagram of the cyclic conveying of grains during the drying process;

[0032] Figure 6 It is a schematic diagram of the hot air flow during the drying process.

[0033] Reference numerals: 1, box body; 11, chassis; 111, supporting wheel; 112, support leg; 113, trailer connector; 12, frame; 13, sealing plate; 14, heat preservation plate; 15, movable inspection door; 16, hanging ear plate; 2, drying bin; 21, first pipe body; 211, lifting screw; 212, grain outlet; 213, grain inlet; 214, feeding piece; 215, upper pedestal bearing; 216, first support rod; 22, inner cylinder; 221, lower section of inner cylinder; 222, middle section of inner cylinder; 223, upper section of inner cylinder; 224, second support rod; 23, outer cylinder; 231, outer cylinder silo; 232, outer cylinder hopper; 24, grain drying chamber; 25, hot air input chamber; 26, air inlet pipe; 27, air return port; 3, control device; 31, level detection device; 4, dehumidification heat pump unit; 41, compressor; 42, evaporator; 43, condenser; 44, regenerator; 5, grain feeding and discharging device; 51, second pipe body; 52, feeding and discharging screw; 53, elbow pipe fitting; 531, elbow drive assembly; 54, drive mechanism; 541, drive wheel; 542, driven wheel; 543, belt; 544, motor; 545, safety guard; 55, feed hopper; 56, discharging assembly; 561, discharging shutter; 562, slot; 57, lower pedestal bearing; 6, fan; 7, cartridge dust removal device; 71, dust removal chamber; 72, clean air chamber; 73, filter cartridge; 74, pulse jet device; 741, air delivery pipe; 742, pulse solenoid valve; 743, nozzle. Detailed implementation manners

[0034] The technical solutions of the present utility model will be clearly and completely described below through detailed embodiments in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0035] Please refer to Figures 1 to 6, this embodiment provides a mobile grain heat pump dryer, which includes a box body 1. Inside the box body 1, there is a drying bin 2 for dehumidifying and drying grains and an equipment bin for placing electrical equipment. The equipment bin is equipped with a control device 3 and a dehumidification heat pump unit 4 for turning humid hot air into dry hot air. Inside the drying bin 2, a first tube 21, an inner cylinder 22, and an outer cylinder 23 are coaxially distributed in the vertical direction. The surfaces of the inner cylinder 22 and the outer cylinder 23 are both distributed with breathable ventilation holes. The inner cylinder 22 is located between the first tube 21 and the outer cylinder 23. The bottom of the first tube 21 is connected to a grain inlet and outlet device 5 for inputting and discharging grains. A lifting screw 211 connected to the grain inlet and outlet device 5 is rotatably arranged inside the first tube 21, so that grains can be conveyed upward and put into the grain drying cavity. A grain drying cavity 24 for accommodating grains is formed between the inner cylinder 22 and the outer cylinder 23. The upper part of the first tube 21 is provided with a grain outlet 212 communicating with the upper part of the grain drying cavity 24. The grains conveyed by the lifting screw 211 can be discharged into the grain drying cavity 24 from the grain outlet 212. The lower part of the first tube 21 is provided with a grain inlet 213 communicating with the lower part of the grain drying cavity 24. In this way, during the drying process, the grains located in the lower part of the grain drying cavity can enter the first tube through the grain inlet, and then can be conveyed upward again by the lifting screw and enter the upper part of the grain drying cavity, realizing the cyclic drying process of grains; when the drying process is completed, the lifting screw can be driven reversely, so that the grains that have been dried in the grain drying cavity can enter the first tube through the grain inlet, and then be discharged downward. A hot air input cavity 25 is formed between the inner cylinder 22 and the first tube 21. The inner cylinder 22 is connected to an air inlet pipe 26 communicating with the hot air input cavity 25. The air inlet pipe 26 is connected to the air outlet of the dehumidification heat pump unit 4 through a fan 6. In this way, the dry hot air provided by the dehumidification heat pump unit can be directly input into the hot air input cavity through the air inlet pipe, and then can penetrate and diffuse from the inside to the outside through the breathable ventilation holes distributed on the surface of the inner cylinder, and the grains can be fully dried. A return air port 27 is provided at the lower part of the side wall of the drying bin 2 close to the equipment bin. The return air port 27 is connected to the return air port of the dehumidification heat pump unit 4 through a filter cartridge dust removal device 7. In this way, the grains obtain heat in the grain drying cavity and volatilize moisture, making the originally introduced dry hot air become humid hot air with water vapor. These humid hot air can penetrate and diffuse from the inside to the outside through the breathable ventilation holes distributed on the surface of the outer cylinder in the grain drying cavity, so as to escape from the outer cylinder and enter the drying cavity. Finally, the humid hot air converges and flows out from the return air port located at the lower part of the drying bin, and the dust is filtered and intercepted by the filter cartridge dust removal device to realize dust-free discharge during the drying process, and then flows back to the dehumidification heat pump unit to be processed into dry hot air.

[0036] In some embodiments, referring to Figure 5, a dialing piece 214 corresponding to the position of the grain outlet 212 is provided at the upper end of the lifting screw 211, so that the grain lifted to the upper part of the first pipe body by the lifting screw can be dialed out, avoiding grain blockage.

[0037] In some embodiments, referring to Figure 2 , Figure 3 , Figure 5 and Figure 6 , the grain inlet and outlet device 5 includes a second pipe body 51 and an inlet and outlet screw 52. The second pipe body 51 is horizontally installed at the bottom of the box body 1. The inlet and outlet screw 52 is rotatably installed inside the second pipe body 51. One end of the second pipe body 51 is communicated with the lower part of the first pipe body 21 through an elbow pipe fitting 53. An elbow transmission assembly 531 for power transmission connection with the inlet and outlet screw 52 and the lifting screw 211 is provided inside the elbow pipe fitting 53. The inlet and outlet screw 52 is connected with a driving mechanism 54 at the end far from the elbow transmission assembly 531; the lifting screw and the inlet and outlet screw are driven by the same power source, and through forward and reverse driving, feeding or discharging can be realized. An inlet hopper 55 is provided on the upper part of the side wall of the second pipe body 51. The grain to be dried can be added into the second pipe body through the inlet hopper, and thus is sent into the grain drying cavity. A discharge assembly 56 is provided on the lower part of the side wall of the second pipe body 51. When the drying process is completed, under the reverse driving action of the inlet and outlet screw, the dried grain can be discharged by opening the discharge assembly.

[0038] In some specific embodiments, referring to Figure 2 and Figure 5 , the discharge assembly 56 includes a slot 562 provided on the lower part of the side wall of the second pipe body 51 and a discharge plug board 561 inserted into the slot 562. By inserting and pulling out the discharge plug board, the opening of the slot can be quickly opened or closed.

[0039] In some specific embodiments, referring to Figures 1 to 3 , Figure 5 and Figure 6 , the driving mechanism 54 includes a driving wheel 541, a driven wheel 542, a belt 543 and a motor 544. The driven wheel 542 is connected with the inlet and outlet screw 52. The driving wheel 541 is connected with the output end of the motor 544. The belt 543 is respectively connected with the driving wheel 541 and the driven wheel 542. By the drive of the motor and the transmission of the belt, the power obtained by the driving wheel can be transmitted to the driven wheel, so that the inlet and outlet screw and the lifting screw can be driven to rotate forward and backward. Preferably, the motor is a three-phase motor. Safety guards are sleeved on the outer circumferences of the driving wheel and the driven wheel.

[0040] In some specific embodiments, referring toFigure 5 One end of the feeding and discharging screw 52 away from the elbow pipe fitting 53 is connected to the second pipe body 51 through a lower pedestal bearing 57, and one end of the lifting screw 211 away from the elbow pipe fitting 53 is connected to the first pipe body 21 through an upper pedestal bearing 215. Both the feeding and discharging screw and the lifting screw include a rotating shaft and auger blades spirally distributed along the surface of the rotating shaft. The elbow transmission assembly is a gear set composed of two meshing 90-degree bevel gears, and the gear set is installed inside the elbow pipe fitting through a gear seat.

[0041] In some embodiments, referring to Figure 4 and Figure 5 , a first support rod 216 is connected between the upper outer wall of the first pipe body 21 and the inner wall of the outer cylinder 23, and a second support rod 224 is provided between the lower part of the inner cylinder 22 and the inner wall of the outer cylinder 23, so that the first pipe body, the inner cylinder and the outer cylinder can be assembled and fixed more stably.

[0042] In some specific embodiments, referring to Figures 4 to 6 , the outer cylinder 23 includes an outer cylinder body silo 231 located at the upper part and an outer cylinder body hopper 232 located at the lower part, and the bottom of the outer cylinder body hopper 232 is fixedly connected to the box body 1; the inner cylinder 22 includes an inner cylinder lower section 221, an inner cylinder middle section 222 and an inner cylinder upper section 223 distributed in sequence from bottom to top. The lower end of the inner cylinder lower section 221 is connected to the outer wall of the first pipe body 21, the lower end of the inner cylinder middle section 222 is connected to the upper end of the inner cylinder lower section 221, and the upper end of the inner cylinder upper section 223 is connected to the outer wall of the first pipe body 21.

[0043] More specifically, as shown in Figure 4 and Figure 5 , the outer cylinder body silo 231 is cylindrical, and the outer cylinder body hopper 232 is in the shape of an inverted cone, so that the conical surface can be used to facilitate the rapid discharge of grain. The inner cylinder middle section 222 is cylindrical, the inner cylinder upper section 223 is conical, and the inner cylinder lower section 221 is in the shape of an inverted cone; in this way, the inner cylinder is divided into three sections for splicing and assembly, which is not only convenient for processing preparation and assembly, but also can strengthen the support; at the same time, the conical inner cylinder upper section can facilitate the rapid fall of the grain after entering the grain drying cavity through the grain inlet, and will not accumulate on the top surface of the inner cylinder upper section. Diffusion channels for facilitating the diffusion of hot air from the inside to the outside are left between the upper end of the inner cylinder middle section 222 and the lower end of the inner cylinder upper section 223, and between the lower end of the inner cylinder middle section 222 and the upper end of the inner cylinder lower section 221, which can accelerate the penetration and diffusion of dry hot air into the grain drying cavity. The diameter of the lower end of the inner cylinder upper section 223 is larger than the diameter of the upper end of the inner cylinder middle section 222, which can prevent the grain from entering the hot air input cavity during the falling process.

[0044] Preferably, the air inlet pipe 26 is connected to the middle section 222 of the inner cylinder. In this way, the input dry and hot air can penetrate and diffuse evenly from the inside to the outside in all directions.

[0045] In some specific embodiments, referring to Figure 3 and Figure 6 , the cartridge dust removal device 7 includes a dust removal chamber 71 and a clean air chamber 72. The lower part of the dust removal chamber 71 is connected to the drying chamber 2 through the air return port 27. The clean air chamber 72 is located above the dust removal chamber 71. The clean air chamber 72 is communicated with the air return port of the dehumidification heat pump unit. A plurality of filter cartridges 73 are provided inside the dust removal chamber 71. The openings of the filter cartridges 73 are vertically upward facing the clean air chamber 72. The clean air chamber 72 is provided with a pulse jet device 74 that blows air in the reverse direction towards the filter cartridges 73. In this way, the humid and hot air containing dust flowing back from the drying chamber can be filtered by the filter cartridges to remove dust. After being used for a period of time, the filter cartridges can be pulsed with air in the reverse direction by the pulse jet device to vibrate and shed the dust adhering to the surface of the filter cartridges, so as to achieve automatic dust removal and maintain the high-efficiency filtering effect of the filter cartridges.

[0046] In some specific embodiments, the filter cartridge 73 is a non-woven fabric filter cartridge structure. By designing a reasonable air velocity lower than 1 m / min, the filtering accuracy of 5 microns can be achieved. The pulse jet device 74 includes an air delivery pipe 741 for delivering high-pressure gas, a pulse solenoid valve 742 provided on the air delivery pipe 741, and a nozzle 743 provided on the air delivery pipe 741 and facing the filter cartridge 73. As an example, the air delivery pipe can be connected to a gas storage tank storing high-pressure gas.

[0047] In some embodiments, referring to Figure 1 and Figure 3 , a level detection device 31 for detecting the height of the grain in the grain drying chamber 24 is provided on the top of the box body 1. As an example, the level detection device can adopt an infrared photoelectric detection switch to detect the height of the grain accumulation in real time using infrared light.

[0048] In some specific embodiments, referring to Figures 1 to 3 and Figure 6 , the box body 1 includes a chassis 11, a frame 12 located above the chassis 11, and a sealing plate 13 installed and connected to the frame 12. A heat preservation plate 14 is provided on the outer surface of the sealing plate 13 located on the outer periphery of the box body 1. By providing the sealing plate and the heat preservation plate, the entire grain drying process can be carried out in a sealed environment, avoiding heat waste and saving energy. Further, a movable maintenance door 15 is also provided on the side wall of the box body 1, so as to facilitate maintenance and repair.

[0049] In some embodiments, referring to Figures 1 to 3 and Figure 6, a towing wheel 111 and several adjustable-height support legs 112 are provided at the bottom of the chassis 11, and a trailer connector 113 is provided at one end of the chassis 11. During use, the entire mobile grain heat pump dryer can be supported by the support legs; when it is necessary to move the position, the trailer connector can be used to connect with a vehicle, and the support legs can be adjusted to rise. Under the rolling of the towing wheels, it can be easily carried and moved.

[0050] In some embodiments, referring to Figure 1 , a plurality of hanging ear plates 16 are provided at the top of the box body 1, and hanging holes are provided in the hanging ear plates 16. In this way, the mobile grain heat pump dryer can also be carried and moved by tying and connecting the hanging ear plates with ropes.

[0051] In some specific embodiments, the dehumidification heat pump unit 4 can adopt conventional condensation dehumidification technology, and the structure and dehumidification and heating principle can refer to CN108955225A, which can turn humid hot air into dry hot air. As an example, such as Figure 3 and Figure 6 shown, the dehumidification heat pump unit 4 includes a compressor 41, an evaporator 42, a condenser 43, and a regenerator 44 with a staggered cross-channel structure, etc. The corresponding air ducts can be separated and connected by partitions to form. Specifically, the humid hot air filtered by the cartridge dust removal device 7 first enters the cooling side of the regenerator 44 for the first-stage cooling, and then passes through the evaporator 42 for the second-stage cooling, so that the moisture in the humid hot air becomes liquid and is discharged. Then, the dehumidified air is first-stage heated through the heating side of the regenerator 44, and then passes through the condenser 43 for the second-stage heating, so that the air becomes dry hot air. At this time, the formed dry hot air is then transported into the hot air input cavity 25 by the fan 6, and then penetrates and diffuses outward to dry the grain.

[0052] The working principle is as follows:

[0053] On the one hand, such as Figure 5As shown in the figure, the process of grain cyclic conveying is as follows: The grain to be dehumidified and dried is fed into the second pipe body 51 through the feed hopper 55, and can be fed into the first pipe body 21 along with the conveying of the feeding and discharging screw 52, and is conveyed upward by the lifting screw 211 and discharged into the grain drying chamber 24 from the grain outlet 212. At the same time, some of the grain that initially falls into the grain drying chamber 24 and the grain piled up at the lower part in the grain drying chamber 24 will be conveyed upward again by the lifting screw 211 through the grain inlet 213 and re-enter the grain drying chamber 24, thus forming a cyclic conveying of the grain, so that the grain can be fully dried. Specifically, during the drying process, the grain can be cyclically conveyed 5 to 6 times as needed (which can be adjusted in combination with the hourly conveying volume of the grain and the bin capacity of the grain drying chamber). Each cyclic conveying lasts for a period of time. In this way, the grain that has volatilized water and obtained heat can be lifted to the upper part of the grain drying chamber during the cyclic conveying process for a short-time tempering, which is convenient for the internal moisture of the grain kernels to diffuse outward.

[0054] On the other hand, as Figure 6 shown in the figure, it shows the schematic diagram of the hot air flow direction. Specifically, the process of the air flow for drying the grain is as follows: Since both the inner cylinder 22 and the outer cylinder 23 are made of ventilation hole plates, they can not only separate the grain but also ventilate evenly; when the wet grain is fully loaded, the dehumidification heat pump unit 4 starts to work. The hot dry air coming out of the air outlet of the dehumidification heat pump unit 4 is blown into the hot air input chamber 25 by the fan 6 through the air inlet pipe 26, and then penetrates and diffuses from the inside to the outside to dehumidify and heat-dry the grain located in the grain drying chamber 24. The grain obtains heat under the action of the hot dry air to volatilize water, making the originally introduced hot dry air become hot and humid air with water vapor. These hot and humid air finally converge and flow out from the air return port 27 located at the lower part of the drying bin 2. Then, after being filtered by the filter cartridge dust removal device 7 to remove dust, it enters the air return port of the dehumidification heat pump unit 4 again, and is dehumidified, dried and heated by the cooling circuit in the dehumidification heat pump unit 4 to become hot dry air again, and continues to be sent into the grain drying chamber 24, so as to continuously carry out a closed-loop dehumidification and drying treatment on the grain; when the drying treatment is completed (which can be judged by discharging some grain and using a grain moisture meter for detection), by reversely driving the lifting screw 211 and the feeding and discharging screw 52, the grain that has been dried in the grain drying chamber 24 will be sucked into the first pipe body 21 through the grain inlet 213, and then conveyed downward by the lifting screw 211, so that the grain can be discharged by opening the discharge flap.

[0055] The above embodiments are only illustrative of the concept and technical solutions of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

[0056] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mobile grain heat pump dryer, comprising a box body, wherein a drying bin and an equipment bin are arranged inside the box body, and a control device and a dehumidification heat pump unit are installed in the equipment bin, and it is characterized in that, Inside the drying bin, a first pipe body, an inner cylinder, and an outer cylinder are coaxially distributed in the vertical direction. Ventilation holes are distributed on the surfaces of the inner cylinder and the outer cylinder. The inner cylinder is located between the first pipe body and the outer cylinder. The bottom of the first pipe body is connected to a grain inlet and outlet device. A lifting screw connected to the grain inlet and outlet device is rotatably arranged inside the first pipe body. A grain drying chamber is formed between the inner cylinder and the outer cylinder. An upper part of the first pipe body is provided with a grain outlet communicating with the upper part of the grain drying chamber, and a lower part of the first pipe body is provided with a grain inlet communicating with the lower part of the grain drying chamber. A hot air input chamber is formed between the inner cylinder and the first pipe body. The inner cylinder is connected to an air inlet pipe communicating with the hot air input chamber. The air inlet pipe is connected to the air outlet of the dehumidification heat pump unit through a fan. A return air port is provided at the lower part of the side wall of the drying bin close to the equipment bin. The return air port is connected to the return air port of the dehumidification heat pump unit through a filter cartridge dust removal device.

2. The mobile grain heat pump dryer according to claim 1, characterized in that, A deflector is provided at the upper end of the lifting screw corresponding to the position of the grain outlet.

3. The mobile grain heat pump dryer according to claim 1, characterized in that, The grain inlet and outlet device includes a second pipe body and a feeding and discharging screw. The second pipe body is horizontally installed at the bottom of the box body. The feeding and discharging screw is rotatably installed inside the second pipe body. One end of the second pipe body is connected to the lower part of the first pipe body through an elbow pipe fitting. An elbow transmission assembly for power transmission connection with the feeding and discharging screw and the lifting screw is provided inside the elbow pipe fitting. The feeding and discharging screw is connected with a driving mechanism at the end far from the elbow transmission assembly. A feeding hopper is provided at the upper part of the side wall of the second pipe body, and a discharging assembly is provided at the lower part of the side wall of the second pipe body.

4. The mobile grain heat pump dryer according to claim 3, characterized in that, The discharging assembly includes a slot provided at the lower part of the side wall of the second pipe body and a discharging plug inserted into the slot.

5. The mobile grain heat pump dryer according to claim 1, characterized in that, A first support rod is connected between the outer wall of the upper part of the first pipe body and the inner wall of the outer cylinder. A second support rod is provided between the lower part of the inner cylinder and the inner wall of the outer cylinder.

6. The mobile grain heat pump dryer according to claim 5, characterized in that, The outer cylinder includes an outer cylinder body bin at the upper part and an outer cylinder body hopper at the lower part. The bottom of the outer cylinder body hopper is fixedly connected to the box body. The inner cylinder includes an inner cylinder lower section, an inner cylinder middle section, and an inner cylinder upper section distributed in sequence from bottom to top. The lower end of the inner cylinder lower section is connected to the outer wall of the first pipe body. The lower end of the inner cylinder middle section is connected to the upper end of the inner cylinder lower section. The upper end of the inner cylinder upper section is connected to the outer wall of the first pipe body.

7. The mobile grain heat pump dryer according to claim 1, characterized in that The filter cartridge dust removal device includes a dust removal chamber and a clean air chamber. The lower part of the dust removal chamber is communicated with the drying bin through the return air port. The clean air chamber is located above the dust removal chamber. The clean air chamber is communicated with the return air port of the dehumidification heat pump unit. A plurality of filter cartridges are provided inside the dust removal chamber. The openings of the filter cartridges face vertically upward towards the clean air chamber. The clean air chamber is provided with a pulse jet device for blowing air in the reverse direction of the filter cartridges.

8. The mobile grain heat pump dryer according to claim 1, wherein, A level detection device for detecting the height of the grain in the grain drying chamber is provided at the top of the box body.

9. The mobile grain heat pump dryer according to any one of claims 1 to 8, characterized in that, The box body includes a chassis, a frame located above the chassis, and a sealing plate installed and connected to the frame. A heat preservation plate is provided on the outer surface of the sealing plate located on the outer periphery of the box body.

10. The mobile grain heat pump dryer according to claim 9, wherein, The bottom of the chassis is provided with trailer wheels and a number of support legs with adjustable heights. A trailer connector is provided at one end of the chassis.

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