Air energy heat pump directly-heated grain dryer

Abstract

The invention belongs to the technical field of grain drying, and particularly relates to an air energy heat pump directly-heated grain dryer which comprises a drying layer, an auger conveyor, an elevator, a heating system and an angular tubular heating pipeline, the bottom of the dryer is of a conical structure, the auger conveyor is arranged at the bottom of the conical structure, the elevator is arranged at the output end of the auger conveyor, and the heating system is arranged at the output end of the auger conveyor. And the drying layer heating system comprises an air energy heat pump heater, the defects in the prior art are overcome, and the problem that heat efficiency is reduced due to the fact that heat dissipation fins of an evaporator and a condenser of an existing air energy heat pump grain dryer are extremely prone to being blocked by dust is solved.

Description

Technical Field

[0001] This invention belongs to the field of grain drying technology, specifically relating to an air-source heat pump direct-heating grain dryer. Background Technology

[0002] A grain dryer is a machine that uses a heat source to heat air, generating a large volume of hot air in a short time. A hot air blower propels this hot air through the gaps between grain grains, heating the grain and removing moisture, thus drying it. This facilitates storage and transportation. Harvested grain is dried directly, unaffected by weather, reducing heat generation and mold during wet grain storage. It also avoids dust and bird feed during the drying process, ensuring cleanliness and hygiene, completely solving the grain drying problem and guaranteeing grain quality.

[0003] Existing grain dryers heat the air before blowing it into the drying chamber. The hot air enters from one end and exits from the other. The exhaust air contains a large amount of dust and rice husks, which can easily clog the dust removal equipment. At the same time, the heating mode is mostly coal combustion, which is extremely inconvenient to use. Summary of the Invention

[0004] The purpose of this invention is to provide an air-source heat pump direct-heating grain dryer, which greatly reduces the number of condenser heat dissipation fins, uses large-spaced fins for heat absorption in the evaporator, and adds a fin dust removal device, thus overcoming the shortcomings of the prior art and solving the problems of existing grain dryers where hot air cannot be recovered, dust removal equipment is easily clogged, and combustion heat generation is not environmentally friendly.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] An air-source heat pump direct-heating grain dryer includes a drying chamber, an auger conveyor, an elevator, and a heating system. The drying chamber has a conical bottom, and the auger conveyor is located at the bottom of the conical structure. An elevator at the output end of the auger conveyor transports the grain back into the drying chamber for multiple drying cycles. The dryer is characterized by further including angled tubular heating pipes. Each angled tubular heating pipe includes two fixed plates, several inlet pipes, and several outlet pipes. The inlet and outlet pipes have identical structures, both being inverted V-shaped grooves. The inlet pipes are evenly distributed and vertically fixed between the two fixed plates, and the outlet pipes are also evenly distributed and vertically fixed between the two fixed plates. Each outlet pipe has four inlet pipes externally. The inlet and outlet pipes are parallel. One fixed plate has only an inlet port for the inlet pipes, and the other fixed plate has only an outlet port for the outlet pipes. Self-cooling elements are distributed within the grooves of the inlet and outlet pipes. The heating system includes a wind box, a fan, a condenser, an evaporator, a heat exchange core, a compressor, a gas-liquid separator, a liquid storage tank, and valves. The wind box is divided into three zones: zone one, zone two, and zone three by three partitions. The heat exchange core is located in the middle of the wind box and connects zone one, zone two, and zone three. Zone three is divided into zone four and zone five by the evaporator. The fan and condenser are both located in zone one, so zone one is connected to the air inlet through a duct. The conical structure is encased in an outer shell, which forms return air channels on both sides of the conical structure. A sealing cover is installed outside the drying room at the air outlet, and the sealing cover is connected to the return air channel through a pipe. The return air channel is connected to zone four, passes through the evaporator, and enters zone five. Zone five is connected to zone one through the heat exchange core. Zone two has an air inlet window connected to the outside and is connected to zone one through the heat exchange core. The self-made condenser is connected to the condenser top.

[0007] Furthermore, both the self-made condenser and the condenser are condensers.

[0008] Furthermore, the condenser, evaporator, compressor, gas-liquid separator, and liquid storage tank constitute an air-source heat pump heater.

[0009] Furthermore, the inverted V-shaped groove has two sides that bend inwards at the bottom, forming a pentagonal structure.

[0010] Furthermore, a spray pipe is provided at the location of the evaporator, and the spray pipe is connected to a water tank through a water pipe and a water pump.

[0011] Furthermore, a water-saving box is provided at the bottom of the spray pipe.

[0012] Furthermore, the evaporator employs large-pitch fins.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. It uses the principle of air conditioning to heat air by compressing it to release heat, which is more energy-efficient and environmentally friendly than traditional combustion heating.

[0015] 2. Placing the condenser directly inside the drying chamber maximizes the utilization of heat energy;

[0016] 3. The angled tube heating pipe utilizes the structure of the air inlet pipe having only an air inlet and the air outlet pipe having only an air outlet. After the air enters from the air inlet pipe, since there is no air outlet in the air inlet pipe, it can only be discharged from the bottom, rushing into the air outlet pipe and being discharged from the air outlet of the air outlet pipe. As the grain falls from top to bottom, it can fully combine with the hot air, which greatly improves the drying effect.

[0017] 4. Place the evaporator of the hot air system (i.e., the evaporator of the heat pump) directly into the dust removal area (i.e., zone three), and then use the return air duct to transport the exhaust high-humidity and high-dust air to the dust removal area (i.e., zone three). Under the action of the evaporator, the high-humidity and high-dust air will condense, thereby removing moisture and dust from the air.

[0018] 5. Evaporator dust removal can effectively avoid clogging of filter screen dust collectors;

[0019] 6. The spray pipes can remove dust from the evaporator simply by spraying, making cleaning easy;

[0020] 7. The horizontal partition has a connecting door. When the humidity and dust of the return air are not high, the return air with residual heat can be returned to the blower area for reuse, thus recovering and utilizing residual heat energy and further improving energy-saving effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an air-source heat pump direct-heating grain dryer.

[0022] Figure 2 This is a side view of a direct-heating grain dryer powered by an air-source heat pump.

[0023] Figure 3 This is a schematic diagram of the internal structure of an air-source heat pump direct-heating grain dryer.

[0024] Figure 4 Schematic diagram of an angled tubular heating pipe Figure 1 .

[0025] Figure 5 Schematic diagram of an angled tubular heating pipe Figure 2 .

[0026] Figure 6 This is a schematic diagram of the internal structure of a angular tubular heating pipe.

[0027] Figure 7 This is a schematic diagram of airflow in the angled tubular heating pipes inside the dryer.

[0028] Figure 8 This is a schematic diagram of the heating system's principle structure. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] As shown in the figure, the air-source heat pump direct-heating grain dryer of the present invention includes a drying chamber 1, an auger conveyor 2, an elevator 3, a heating system 4, and an angled tubular heating pipe 5. The bottom of the drying chamber 1 is a conical structure. The auger conveyor 2 is located at the bottom of the conical structure. The elevator 3 is located at the output end of the auger conveyor 2. The elevator 3 transports the grain back into the drying chamber 1 for multiple drying cycles. The angled tubular heating pipe 5 includes two fixed plates 501 and 502, several air inlet pipes 51, and several air outlet pipes 52. The air inlet pipes 51 and air outlet pipes 52 have the same structure, both being inverted V-shaped grooves. A number of air outlet pipes 52 are evenly and vertically fixed between two fixing plates 501 and 502. Each air outlet pipe 52 has four air inlet pipes 51 on its exterior. The air inlet pipes 51 and air outlet pipes 52 are parallel. One fixing plate 501 has only an air inlet 53 that mates with the air inlet pipe 51, and the other fixing plate 502 has only an air outlet 54 that mates with the air outlet pipe 52. Self-made condensers 71 are distributed in the slots of the air inlet pipes and air outlet pipes. The heating system 4 includes a wind box 401, a fan 5, a condenser 7, an evaporator 8, a heat exchange core 9, and a compressor. The system comprises a machine 19, a gas-liquid separator 11, a liquid storage tank 12, and a valve 13. The air box 41 is divided into three zones: zone 1 (401), zone 2 (402), and zone 3 (403) by three partitions. The heat exchange core 9 is located in the middle of the air box 41, connecting zones 1 (401), 2 (402), and 3 (403). Zone 3 (403) is further divided into zone 4 (404) and zone 5 (405) by an evaporator 8. The fan 6 and condenser 7 are both located within zone 1 (401), so zone 1 (401) is connected to the air inlet via a duct 411. The conical structure is encased in a shell, which is part of the conical structure. Return air channels 101 are formed on both sides of the location. A sealing cover is provided at the air outlet of the drying room. The sealing cover is connected to the return air channel 101 through a pipe. The return air channel 101 is connected to zone four 404, passes through the evaporator and enters zone five 405. Zone five 405 is connected to zone one 401 through the heat exchange core 9. Zone two 402 is provided with an air inlet window 421 connected to the outside. Zone two 402 is connected to zone one 401 through the heat exchange core 9. The self-made condenser 71 is connected to the condenser 7. Both the self-made condenser and the condenser are condensers. The valve is located in zone one.

[0031] Furthermore, the condenser, evaporator, compressor, gas-liquid separator, and liquid storage tank constitute an air source heat pump heater (i.e., the heating system of an air conditioner); the inverted V-shaped groove is bent inward on both sides below, forming a pentagonal structure; a spray pipe is provided at the evaporator position, and the spray pipe is connected to a water tank through a water pipe and a water pump; a water-saving box is provided below the spray pipe; and large-spacing fins are used on the evaporator.

[0032] Working Principle: During operation, it utilizes the principle of air conditioning for heating, compressing air to release heat. Placing the air conditioner's condenser directly inside the drying chamber maximizes heat energy utilization. The angled tube heating pipes employ a structure where the inlet pipe has only an inlet and the outlet pipe has only an outlet. Air entering through the inlet pipe, lacking an outlet, is forced to exit from below, flowing into the outlet pipe and exiting through its outlet. As the grain falls from top to bottom, it is fully combined with the hot air, significantly improving the drying effect. The air conditioner's evaporator is placed directly inside the drying chamber. The exhaust air, which is high in humidity and dust, is placed in the dust removal zone (i.e., zone three). The high-humidity, high-dust air is then transported to the dust removal zone (i.e., zone three) through the return air duct. Under the action of the evaporator, the high-humidity, high-dust air will condense, thereby removing moisture and dust from the air. Evaporator dust removal can effectively avoid the clogging of filter screen dust removal. The spray pipe can remove dust from the evaporator simply by spraying, making cleaning easy. The horizontal partition has a connecting door. When the humidity and dust of the return air are not high, the return air with residual heat can be returned to the blower zone for reuse, recovering residual heat energy and further improving energy-saving effect.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An air-source heat pump direct-heating grain dryer, comprising a drying chamber, an auger conveyor, an elevator, and a heating system, wherein the bottom of the drying chamber is a conical structure, the auger conveyor is disposed at the bottom of the conical structure, and the elevator at the output end of the auger conveyor conveys the grain back into the drying chamber for multiple drying processes, characterized in that: It also includes angled tubular heating pipes, which consist of two fixed plates, several inlet pipes, and several outlet pipes. The inlet and outlet pipes have identical structures, both being inverted V-shaped grooves. The inlet pipes are evenly distributed and vertically fixed between the two fixed plates, and the outlet pipes are also evenly distributed and vertically fixed between the two fixed plates. Each outlet pipe has four inlet pipes on its exterior. The inlet and outlet pipes are parallel. One fixed plate has only an inlet port for the inlet pipes, and the other fixed plate has only an outlet port for the outlet pipes. Self-made condensers are distributed within the grooves of the inlet and outlet pipes. The heating system includes a wind box, a fan, a condenser, an evaporator, a heat exchange core, a compressor, a gas-liquid separator, a liquid storage tank, and valves. The wind box is connected by three partitions... The plate is divided into three zones: Zone 1, Zone 2, and Zone 3. The heat exchange core is located in the middle of the air box, connecting Zones 1, 2, and 3. Zone 3 is further divided into Zones 4 and 5 by the evaporator. The fan and condenser are both located in Zone 1, so Zone 1 is connected to the air inlet via a duct. The conical structure is encased in an outer shell, which forms return air channels on both sides of the conical structure. A sealing cover is installed outside the drying room at the air outlet, and the sealing cover is connected to the return air channel via a pipe. The return air channel is connected to Zone 4, passes through the evaporator, and enters Zone 5. Zone 5 is connected to Zone 1 via the heat exchange core. Zone 2 has an air inlet window connected to the outside, and Zone 2 is connected to Zone 1 via the heat exchange core. The self-made condenser is connected to the condenser.

2. The air-source heat pump direct-heating grain dryer according to claim 1, characterized in that: Both the self-made condenser and the condenser are condensers.

3. The air-source heat pump direct-heating grain dryer according to claim 1, characterized in that: The condenser, evaporator, compressor, gas-liquid separator, and liquid storage tank constitute an air-source heat pump heater.

4. The air-source heat pump direct-heating grain dryer according to claim 1, characterized in that: The inverted V-shaped groove has two sides that bend inwards at the bottom, forming a pentagonal structure.

5. A direct-heating grain dryer using an air-source heat pump according to any one of claims 1 to 4, characterized in that: The evaporator is equipped with a spray pipe, which is connected to a water tank via a water pipe and a water pump.

6. The air-source heat pump direct-heating grain dryer according to claim 5, characterized in that: The spray pipe is equipped with a water-saving box.

7. The air-source heat pump direct-heating grain dryer according to claim 6, characterized in that: The evaporator uses large-pitch fins.

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