Heat pump device for drying malt

Abstract

The invention discloses a heat pump device for drying malt, relates to the field of drying heat pumps, solves the problems of lower energy utilization efficiency and higher production cost when the existing heat pump device for drying malt is used, and comprises a base, a germination box, a drying box, a three-stage heat pump mechanism and an auxiliary mechanism, the three-stage heat pump mechanism comprises a fixing device cylinder, a first shell, a second shell, a third shell, a separation layer, a condenser, an evaporator and a conveying part, the three-stage heat pump mechanism is used for synchronously performing multi-stage heating and refrigeration operation on fluid, and heat is carried to a required position through the conveying part to perform low-temperature bud control on the germination box; high-temperature drying is carried out on the drying box, the energy use efficiency is improved, the energy transfer efficiency between airflow and a conveying part pipeline is improved while auxiliary accelerated conveying is carried out on air through the auxiliary mechanism, heat generated and dissipated by equipment is fully utilized, energy waste generated in the heat conveying and discharging process is reduced, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of drying heat pump technology, specifically a heat pump device for drying malt. Background Technology

[0002] In the malt processing industry, core processes such as malt germination and drying have strict and stable requirements for temperature and heat supply, necessitating a continuous coordination of heat and cold sources to ensure malt quality and processing efficiency. Currently, the industry commonly uses a traditional energy supply combination of "steam boiler + chiller unit" to meet these process requirements: the steam boiler converts energy through fuel combustion to provide a high-temperature heat source for processes such as malt drying; the chiller unit relies on electrical energy to drive the compressor for refrigeration, supplying a low-temperature cold source for the malt germination process.

[0003] This traditional energy supply model has significant technical drawbacks: On the one hand, steam boilers and chillers operate independently, with energy supply and consumption being unidirectional. During the utilization process, a large amount of waste heat generated by the boiler is directly released into the environment without effective recovery; the condensation heat generated during the cooling process of the chiller is also usually directly lost, resulting in a double waste of energy. On the other hand, steam boilers rely on fossil fuel combustion, which not only incurs high fuel costs but also generates a large amount of pollutants such as waste gas and slag, which is inconsistent with the current trend of green and low-carbon industrial development. Summary of the Invention

[0004] The purpose of this invention is to provide a heat pump device for malt drying that facilitates improved energy utilization efficiency and reduced production costs, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a heat pump device for malt drying, comprising a base, a three-stage heat pump mechanism, and an auxiliary mechanism. A germination chamber and a drying chamber are fixedly connected to the base. The three-stage heat pump mechanism includes a device cylinder fixedly installed above the base. A first shell, a second shell, and a third shell are fixedly connected inside the device cylinder. A partition layer is fixedly connected to the middle of each of the first, second, and third shells. A condenser is fixedly connected to the upper side of the partition layer, and an evaporator is fixedly connected to the lower side of the partition layer. The device cylinder is equipped with a conveying component for separately circulating and conveying cold and hot water. The three-stage heat pump mechanism can simultaneously operate multi-stage heating and cooling, transporting heat through the conveying component to the desired location for low-temperature germination control in the germination chamber and high-temperature drying in the drying chamber, thereby improving energy efficiency. The auxiliary mechanism is installed above the base and is used to assist in accelerating the transport of air while improving the energy transfer efficiency between the airflow and the conveying component pipe, thus facilitating improved energy utilization efficiency and reducing production costs.

[0006] Preferably, the three-stage heat pump mechanism further includes a cooler fixedly installed between the device cylinder and the germination box, a heater fixedly connected between the device cylinder and the drying box, and a conveying trough respectively opened between the cooler and the heater. The bottom end of the conveying trough in the cooler is connected to the germination box, and the bottom end of the conveying trough in the heater is connected to the drying box. The top of the device cylinder is provided with a recovery component for utilizing the heat inside the output airflow after drying, which facilitates the simultaneous operation of multi-stage heating and cooling, and the heat is transported through the conveying component to the required position for low-temperature germination control in the germination box and high-temperature drying in the drying box, thereby improving energy utilization efficiency.

[0007] Preferably, the conveying component includes a first coil fixedly installed inside the cooler, the bottom end of the first coil being connected to the evaporator region inside the first housing, the top end of the first coil being connected to a second coil, one end of the second coil being connected to the condenser region inside the first housing, the condenser region inside the first housing being connected to a first pipe, one end of the first pipe being connected to the condenser region inside the second housing, the condenser region inside the second housing being connected to a second pipe, and one end of the second pipe being connected to the condenser region inside the third housing, facilitating the conveying of cold water.

[0008] Preferably, the conveying component further includes a third coil fixedly installed inside the heater. The top end of the third coil is connected to the condenser region inside the third housing, and the bottom end of the third coil is connected to a third pipe. The third pipe is connected to the evaporator region of the third housing, and the evaporator region of the third housing is connected to a fourth pipe. The bottom end of the fourth pipe is connected to the evaporator region of the second housing, and the evaporator region of the second housing is connected to a fifth pipe. The bottom end of the fifth pipe is connected to the evaporator region of the first housing, facilitating the delivery of hot water.

[0009] Preferably, the auxiliary mechanism includes multiple sets of drive blades installed in the conveying trough. The outer walls of the first coil and the third coil are respectively rotatably connected to rotating tubes. The drive blades are uniformly fixedly installed on the outer walls of the rotating tubes. The multiple sets of rotating tubes are evenly distributed in the conveying trough. The arc surfaces of the drive blades on the outer walls of adjacent rotating tubes are opposite. A connecting gear is coaxially fixedly connected to the rotating tube. The multiple sets of rotating tubes are driven by meshing with the connecting gear. The pitch circle radius of the upper gear of any meshing connecting gear is larger than that of the lower gear, which facilitates the auxiliary acceleration and conveying of air while improving the energy transfer efficiency between the airflow and the conveying pipe.

[0010] Preferably, the recovery component includes a waste heat recovery box fixedly installed on the upper side of the device cylinder, the second coil is located inside the waste heat recovery box, the top of the drying box is connected to an input pipe, the upper end of the input pipe is connected to the waste heat recovery box, the end of the waste heat recovery box away from the input pipe is connected to an output pipe, and an air inlet groove is provided on the upper side of the heater to facilitate the utilization of the heat inside the output airflow after drying.

[0011] Preferably, the upper side of the germination box is provided with a recovery trough that communicates with the conveying trough inside the cooler. A filter box is inserted into the top of the conveying trough inside the cooler, and a humidity regulator is provided at the bottom of the filter box to facilitate the filtration of the recovered cold air and complete the humidity regulation.

[0012] Preferably, a support net is fixedly connected inside both the germination box and the drying box, and a support cotton is fixedly connected to the upper side of the support net. A top cover is hinged to the upper side of both the germination box and the drying box, which facilitates the placement of malt while ensuring smooth gas delivery.

[0013] Preferably, a drive motor is fixedly connected to both the cooler and the heater. A drive gear is coaxially fixedly connected to the output end of the drive motor. The drive gear meshes with an adjacent connecting gear to facilitate the rotation of the rotating cylinder.

[0014] Preferably, the partition layer is designed for heat insulation, and a compressor and an expansion valve are fixedly connected inside the partition layer. The two ends of the compressor and the expansion valve are respectively connected to the evaporator and the condenser, which facilitates the insulation of heat from the fluids around the evaporator and the condenser.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a heat pump device for malt drying, which solves the problems of low energy utilization efficiency and high production cost of existing heat pump devices for malt drying. Through a three-stage heat pump mechanism, the fluid is simultaneously heated and cooled in multiple stages. The heat is transported to the required location through the conveying component to control germination at low temperature in the germination box and to dry at high temperature in the drying box, thereby improving energy utilization efficiency. The auxiliary mechanism accelerates the transport of air and improves the energy transfer efficiency between the airflow and the conveying component pipes. This fully utilizes the heat generated and dissipated by the equipment, reduces energy waste during heat transport and emission, and lowers production costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the recyclable component of the present invention; Figure 3 for Figure 2 Enlarged view of region A in the middle; Figure 4 This is a partial structural diagram of the three-stage heat pump mechanism of the present invention; Figure 5 for Figure 4 Enlarged view of region B in the middle; Figure 6 for Figure 4 Enlarged view of region C; Figure 7 This is a partial structural breakdown diagram of the auxiliary mechanism of the present invention; Figure 8 for Figure 7 Enlarged view of region D in the middle; Figure 9 for Figure 7 Enlarged view of region E in the middle; Figure 10 for Figure 7 Enlarged view of the F region.

[0017] In the diagram: 1-Base; 2-Germination box; 3-Drying box; 4-Device cylinder; 5-First shell; 6-Second shell; 7-Third shell; 8-Separation layer; 9-Condenser; 10-Evaporator; 11-Conveying component; 12-Cooler; 13-Heater; 14-Conveying trough; 15-Recovery component; 16-First coil; 17-Second coil; 18-First pipe; 19-Second pipe; 20-Third coil; 21-Third pipe; 22-Fourth pipe; 23-Fifth pipe; 24-Drive blade; 25-Rotating tube; 26-Connecting gear; 27-Waste heat recovery box; 28-Input pipe; 29-Output pipe; 30-Air inlet trough; 31-Recovery trough; 32-Filter box; 33-Humidity regulator; 34-Support net; 35-Support cotton; 36-Top cover; 37-Drive motor; 38-Drive gear; 39-Compressor; 40-Expansion valve. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-10This invention provides a technical solution: a heat pump device for drying malt, comprising a base 1, a three-stage heat pump mechanism, and an auxiliary mechanism. A germination chamber 2 and a drying chamber 3 are fixedly connected to the base 1. The three-stage heat pump mechanism includes a device cylinder 4 fixedly installed above the base 1. A first shell 5, a second shell 6, and a third shell 7 are fixedly connected inside the device cylinder 4. A partition layer 8 is fixedly connected to the middle of each of the first shell 5, second shell 6, and third shell 7. A condenser 9 is fixedly connected to the upper side of the partition layer 8, and an evaporator 10 is fixedly connected to the lower side of the partition layer 8. The partition layer 8 is designed for heat insulation. The interior of the partition layer 8 is fixedly connected to... The device is equipped with a compressor 39 and an expansion valve 40. The two ends of the compressor 39 and the expansion valve 40 are connected to the evaporator 10 and the condenser 9, respectively. The device cylinder 4 is equipped with a conveying component 11 for separately circulating and conveying cold water and hot water. The three-stage heat pump mechanism can simultaneously operate multi-stage heating and cooling, and transport heat through the conveying component 11 to the required location for low-temperature germination control in the germination box 2 and high-temperature drying in the drying box 3, thereby improving energy efficiency. An auxiliary mechanism is installed above the base 1 to assist in accelerating the delivery of air while improving the energy transfer efficiency between the airflow and the conveying component 11 pipe.

[0020] Please see Figures 1-10 The three-stage heat pump mechanism shown in the diagram also includes a cooler 12 fixedly installed between the device cylinder 4 and the germination box 2. A heater 13 is fixedly connected between the device cylinder 4 and the drying box 3. A conveying trough 14 is provided between the cooler 12 and the heater 13. The bottom end of the conveying trough 14 in the cooler 12 is connected to the germination box 2, and the bottom end of the conveying trough 14 in the heater 13 is connected to the drying box 3. The top of the device cylinder 4 is provided with a recovery component 15 for utilizing the heat inside the output airflow after drying. The recovery component 15 includes a waste heat recovery box 27 fixedly installed on the upper side of the device cylinder 4. The top of the drying box 3 is connected to an input pipe 28. The upper end of the germination box 2 is connected to the waste heat recovery box 27. The end of the waste heat recovery box 27 away from the input pipe 28 is connected to the output pipe 29. The upper side of the heater 13 is provided with an air inlet slot 30. The upper side of the germination box 2 is provided with a recovery slot 31 that is connected to the conveying slot 14 in the cooler 12. The top of the conveying slot 14 in the cooler 12 is connected to a filter box 32. The bottom of the filter box 32 is provided with a humidity regulator 33. The humidity regulator 33 can also be set at the air inlet of the germination box 2. The germination box 2 and the drying box 3 are both fixedly connected with a support net 34. The upper side of the support net 34 is fixedly connected with a support cotton 35. The upper side of the germination box 2 and the drying box 3 are both hinged with a top cover 36.

[0021] Please see Figures 2-10The conveying component 11 shown in the figure includes a first coil 16 fixedly installed inside the cooler 12. The bottom end of the first coil 16 is connected to the evaporator 10 area inside the first housing 5. The top end of the first coil 16 is connected to a second coil 17, which is located inside the waste heat recovery box 27. One end of the second coil 17 is connected to the condenser 9 area inside the first housing 5. The condenser 9 area inside the first housing 5 is connected to a first pipe 18. One end of the first pipe 18 is connected to the condenser 9 area inside the second housing 6. The condenser 9 area inside the second housing 6 is connected to a second pipe 19. One end of the second pipe 19 is connected to a third... The condenser 9 area inside the housing 7 is connected. The conveying component 11 also includes a third coil 20 fixedly installed inside the heater 13. The top end of the third coil 20 is connected to the condenser 9 area inside the third housing 7. The bottom end of the third coil 20 is connected to a third pipe 21. The third pipe 21 is connected to the evaporator 10 area of ​​the third housing 7. The evaporator 10 area of ​​the third housing 7 is connected to a fourth pipe 22. The bottom end of the fourth pipe 22 is connected to the evaporator 10 area of ​​the second housing 6. The evaporator 10 area of ​​the second housing 6 is connected to a fifth pipe 23. The bottom end of the fifth pipe 23 is connected to the evaporator 10 area of ​​the first housing 5.

[0022] Please see Figures 4-10 The auxiliary mechanism shown in the figure includes multiple sets of drive blades 24 installed in the conveying trough 14. The outer walls of the first coil 16 and the third coil 20 are respectively rotatably connected to rotating tubes 25. The drive blades 24 are uniformly fixedly installed on the outer walls of the rotating tubes 25. Multiple sets of rotating tubes 25 are evenly distributed in the conveying trough 14. The arc surfaces of the drive blades 24 on the outer walls of adjacent rotating tubes 25 are opposite. A connecting gear 26 is coaxially fixedly connected to the rotating tube 25. Multiple sets of rotating tubes 25 are driven by meshing with the connecting gear 26. The pitch circle radius of the upper gear of any meshing connecting gear 26 is larger than that of the lower gear. A drive motor 37 is fixedly connected to both the cooler 12 and the heater 13. The preferred model of the drive motor 37 is YYHS-40. A drive gear 38 is coaxially fixedly connected to the output end of the drive motor 37. The drive gear 38 meshes with an adjacent connecting gear 26.

[0023] Working principle: The malt to be germinated at low temperature is placed above the support cotton 35 in the germination box 2, and the malt to be dried is placed above the support cotton 35 in the drying box 3. Cooling water at approximately 7°C is supplied from the first coil 16. This cooling water is cooled to the required temperature around the evaporator 10 inside the first shell 5 and output to the first coil 16. It flows inside the cooler 12 to cool the air, reducing its temperature to approximately 14°C, and is then transported from bottom to top into the germination box 2 for low-temperature germination of the malt grains. The output airflow is then recovered into the cooler 12 via the upper recovery trough 31. After filtration by the filter box 32, dust is collected. The filtered air is then humidified by the humidity regulator 33 and cooled again around the first coil 16 to approximately 14°C for recycling. Meanwhile, the water inside the first coil 16 flows from bottom to top, absorbing heat from the air and gradually... The fluid is heated to about 17°C. The residual heat in the second coil 17 is then reduced to about 25°C. After that, it flows into the condenser 9 in the first housing 5. After the first stage of heating in the condenser 9, it is transported through the first pipe 18 to the condenser 9 in the second housing 6. After the second stage of heating in the condenser 9, it is transported through the second pipe 19 on the opposite side to the condenser 9 in the third housing 7. After the third stage of heating in the condenser 9, it reaches the required temperature and is output into the third coil 20. The airflow is input from the air inlet 30 and heated to about 90°C around the third coil 20. It is then blown into the drying oven 3 from the bottom to dry the malt. The output gas is transported from the upper input pipe 28 to the waste heat recovery box 27 to preheat the second coil 17, which raises the temperature of the fluid inside the second coil 17. This fully utilizes the heat contained in the discharged gas and finally outputs gas close to room temperature from the output pipe 29.

[0024] The fluid in the third coil 20 is cooled to about 90°C after heat transfer and is output to the third pipe 21. Through the third pipe 21, it is transported to the evaporator 10 inside the third shell 7 for further cooling. The first shell 5, the second shell 6, and the third shell 7 are the outer shells of a three-stage heat pump structure. The interior is used to store and transport fluid. They are combined with the independent evaporator 10, condenser 9, compressor 39, and expansion valve 40 to form a heat exchange structure to transfer heat. After the first stage of cooling, the fluid flows into the evaporator 10 inside the second shell 6 through the fourth pipe 22 for secondary cooling. After the second stage of cooling, the fluid flows into the evaporator 10 inside the first shell 5 through the fifth pipe 23 for tertiary cooling. Finally, the fluid at about 7°C is output to the first coil 16 for circulation.

[0025] It's important to note that during malt germination, respiration releases a significant amount of heat. If the temperature inside the chamber is too high, the germ will elongate rapidly but become weak and susceptible to mold growth. Cool air effectively removes heat, maintaining a stable low-temperature environment within the chamber. A low temperature of 14℃ slows the growth of the germ and embryo, allowing for more complete decomposition and transformation of nutrients (such as starch and protein), thus improving malt quality (e.g., optimizing taste and fermentation performance in beer brewing). The core function of drying malt with 90℃ hot air is to rapidly reduce its moisture content, inhibit enzyme activity and microbial growth, while simultaneously fixing its flavor and color for easier storage and subsequent processing. This process terminates the germination process, preventing continuous nutrient depletion, and removes the raw taste of the malt, promoting the formation of malt aroma and caramel notes to meet the needs of various applications, including beer brewing.

[0026] The drive motor 37 drives the drive gear 38 to rotate, thereby causing multiple sets of connecting gears 26 to operate sequentially. Since the lower gear in each meshing set of connecting gears 26 is smaller than the upper gear, the rotational speed of the rotating tube 25 decreases from bottom to top. Simultaneously, the upper part of the conveying trough 14 is the air inlet, and the lower part is the air outlet. Due to the gear meshing pattern, adjacent rotating tubes 25 rotate in opposite directions. Furthermore, the arc surfaces of the drive blades 24 face opposite directions, ensuring that the rotating tubes 25 always rotate towards the tip of the drive blades 24. Both the rotating tubes 25 and the drive blades 24 are made of copper, which has good thermal conductivity, enabling stable heat transfer from the first coil 16 and the third coil 20 to the drive blades 24. 4. As the gas is transported from top to bottom, it is propelled and accelerated outward by the uppermost drive blade 24. When it reaches the lower area, it enters the vicinity of another set of drive blades 24 with a faster speed and is accelerated and swung. In this way, the gas can be stably transported from top to bottom by the gradual superposition of multiple sets of drive blades 24, generating a transport force similar to an air pump. There is no need to set up an additional air pump. At the same time, it also allows the airflow to fully contact the drive blades 24 to complete the heat transfer and avoid the situation where the temperature transfer cannot be fully completed due to the airflow being transported too fast. The gas flows meanderingly between multiple sets of drive blades 24, which greatly extends the airflow path and ensures that the gas can complete the heat transfer more fully and efficiently.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat pump device for drying malt, characterized in that, include: A base (1) is fixedly connected to a germination box (2) and a drying box (3); Also includes: The three-stage heat pump mechanism includes a device cylinder (4) fixedly installed above the base (1). A first shell (5), a second shell (6), and a third shell (7) are fixedly connected inside the device cylinder (4). A partition layer (8) is fixedly connected to the middle of the first shell (5), the second shell (6), and the third shell (7). A condenser (9) is fixedly connected to the upper side of the partition layer (8), and an evaporator (10) is fixedly connected to the lower side of the partition layer (8). A conveying component (11) is provided inside the device cylinder (4) for separately circulating and conveying cold water and hot water. The three-stage heat pump mechanism can transport heat to the required location through the conveying component (11) by operating multiple stages of heating and cooling simultaneously, thereby improving energy efficiency. An auxiliary mechanism is installed above the base (1) to assist in accelerating the delivery of air while improving the energy transfer efficiency between the airflow and the delivery component (11) pipe.

2. The heat pump device for malt drying according to claim 1, characterized in that: The three-stage heat pump mechanism also includes a cooler (12) fixedly installed between the device cylinder (4) and the germination box (2). A heater (13) is fixedly connected between the device cylinder (4) and the drying box (3). A conveying groove (14) is provided between the cooler (12) and the heater (13). The bottom end of the conveying groove (14) in the cooler (12) is connected to the germination box (2). The bottom end of the conveying groove (14) in the heater (13) is connected to the drying box (3). The top of the device cylinder (4) is provided with a recovery component (15) for utilizing the heat inside the output airflow after drying.

3. A heat pump device for drying malt according to claim 2, characterized in that: The conveying component (11) includes a first coil (16) fixedly installed inside the cooler (12). The bottom end of the first coil (16) is connected to the evaporator (10) area inside the first housing (5). The top end of the first coil (16) is connected to a second coil (17). One end of the second coil (17) is connected to the condenser (9) area inside the first housing (5). The condenser (9) area inside the first housing (5) is connected to a first pipe (18). One end of the first pipe (18) is connected to the condenser (9) area inside the second housing (6). The condenser (9) area inside the second housing (6) is connected to a second pipe (19). One end of the second pipe (19) is connected to the condenser (9) area inside the third housing (7).

4. A heat pump device for drying malt according to claim 3, characterized in that: The conveying component (11) also includes a third coil (20) fixedly installed in the heater (13). The top end of the third coil (20) is connected to the condenser (9) area inside the third housing (7). The bottom end of the third coil (20) is connected to a third pipe (21). The third pipe (21) is connected to the evaporator (10) area of ​​the third housing (7). The evaporator (10) area of ​​the third housing (7) is connected to a fourth pipe (22). The bottom end of the fourth pipe (22) is connected to the evaporator (10) area of ​​the second housing (6). The evaporator (10) area of ​​the second housing (6) is connected to a fifth pipe (23). The bottom end of the fifth pipe (23) is connected to the evaporator (10) area of ​​the first housing (5).

5. A heat pump device for drying malt according to claim 4, characterized in that: The auxiliary mechanism includes multiple sets of drive blades (24) installed in the conveying groove (14). The outer walls of the first coil (16) and the third coil (20) are respectively rotatably connected to rotating tubes (25). The drive blades (24) are uniformly fixedly installed on the outer walls of the rotating tubes (25). Multiple sets of rotating tubes (25) are evenly distributed in the conveying groove (14). The arc surfaces of the drive blades (24) on the outer walls of adjacent rotating tubes (25) are opposite. A connecting gear (26) is coaxially fixedly connected to the rotating tube (25). Multiple sets of rotating tubes (25) are meshed and driven by the connecting gear (26).

6. A heat pump device for drying malt according to claim 3, characterized in that: The recovery unit (15) includes a waste heat recovery box (27) fixedly installed on the upper side of the device cylinder (4), the second coil (17) is located inside the waste heat recovery box (27), the top of the drying box (3) is connected to an input pipe (28), the upper end of the input pipe (28) is connected to the waste heat recovery box (27), the end of the waste heat recovery box (27) away from the input pipe (28) is connected to an output pipe (29), and an air inlet slot (30) is provided on the upper side of the heater (13).

7. A heat pump device for drying malt according to claim 2, characterized in that: The upper side of the germination box (2) is provided with a recycling tank (31) that is connected to the conveying tank (14) in the cooler (12). A filter box (32) is inserted into the top of the conveying tank (14) in the cooler (12). A humidity regulator (33) is provided at the bottom of the filter box (32).

8. A heat pump device for drying malt according to claim 1, characterized in that: Both the germination box (2) and the drying box (3) are fixedly connected with a support net (34), and a support cotton (35) is fixedly connected to the upper side of the support net (34). Both the germination box (2) and the drying box (3) are hinged with a top cover (36).

9. A heat pump device for drying malt according to claim 5, characterized in that: A drive motor (37) is fixedly connected to both the cooler (12) and the heater (13). A drive gear (38) is fixedly connected to the output end of the drive motor (37) on the same axis. The drive gear (38) meshes with an adjacent connecting gear (26).

10. A heat pump device for drying malt according to claim 1, characterized in that: The partition layer (8) is designed for heat insulation. A compressor (39) and an expansion valve (40) are fixedly connected inside the partition layer (8). The two ends of the compressor (39) and the expansion valve (40) are respectively connected to the evaporator (10) and the condenser (9).

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