Container type heat pump unit for grain drying

Abstract

The utility model discloses a container type heat pump unit for grain drying, which belongs to the technical field of heat pumps and comprises a first container, a second container, a third container and a fourth container, a first evaporator is arranged in the first container, a compressor and an expansion valve are arranged in the second container, a first condenser is arranged in the third container, and a second evaporator is arranged in the fourth container. And a second condenser is arranged in the fourth container. The heat pump units are arranged in the four containers, no house needs to be built, the capital construction cost is saved, the occupied area is reduced, the containers can be directly connected or connected through pipelines, the positions of the containers can be adjusted, and the heat pump units can adapt to different installation environments; sealing performance is high, heat loss is little, air outlet temperature is high, energy is saved in autumn and winter, and the requirement for grain drying air outlet temperature is met; and access doors are arranged at the two ends of the container, so that internal equipment is convenient to maintain.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat pumps, and particularly relates to a heat pump unit for container-type grain drying. Background Art

[0002] Heat pump hot air blowers are applied in the field of grain drying and are in a stage of rapid development as a whole. Because of their environmental protection and energy saving and good market prospects, the products of many manufacturers are similar. However, in the face of low environmental temperatures in autumn and winter, the problems of low outlet air temperature and frequent defrosting cannot be completely solved, and the infrastructure construction and installation cycle are long. For example, when drying 300 tons of grain, ordinary heat pump dryers need to build a drying room to place the heat pump hot air blower, with high infrastructure costs, long cycles, large heat losses, and a minimum land occupation area of 300 ㎡. Content of the Utility Model

[0003] The technical problem solved by the utility model is to provide a heat pump unit for container-type grain drying to reduce the infrastructure cost of the heat pump unit and the floor area occupied by the unit.

[0004] Technical Solution: To solve the above technical problems, the technical solution adopted by the utility model is as follows:

[0005] A heat pump unit for container-type grain drying includes a first container, a second container communicated with the first container, a third container communicated with the second container, and a fourth container communicated with the third container. A first evaporator is provided in the first container, a compressor connected to the first evaporator and an expansion valve connected to the first evaporator are provided in the second container, a first condenser connected to the compressor is provided in the third container, and a second condenser connected to the compressor is provided in the fourth container.

[0006] Further, a first air duct is provided in the first container, the first evaporator is located in the first air duct, a dust removal filter screen is provided at the air inlet of the first air duct, a second air duct communicated with the first air duct is provided in the second container, a second evaporator connected to the compressor is provided in the second air duct, and the compressor is arranged outside the second air duct.

[0007] Further, a third air duct communicated with the second air duct is provided in the third container, the first condenser is arranged in the third air duct, a fourth air duct communicated with the third air duct is provided in the fourth container, and the second condenser is arranged in the fourth air duct.

[0008] Further, an auxiliary electric heater is provided at the air outlet of the fourth air duct.

[0009] Further, the air inlet of the first air duct is arranged on one side of the first container, the air outlet of the first air duct is arranged on the other side of the first container, the air inlet of the second air duct is arranged on one side of the second container, the air outlet of the second air duct is arranged on the other side of the second container, the air inlet of the third air duct is arranged on one side of the third container, the air outlet of the third air duct is arranged on the other side of the third container, the air inlet of the fourth air duct is arranged on one side of the fourth container, and the air outlet of the fourth air duct is arranged on the other side of the fourth container.

[0010] Further, the air outlet of the first air duct is directly connected to or connected by a pipeline to the air inlet of the second air duct, the air outlet of the second air duct is directly connected to or connected by a pipeline to the air inlet of the third air duct, and the air outlet of the third air duct is directly connected to or connected by a pipeline to the air inlet of the fourth air duct.

[0011] Further, a pre-cooling evaporator is provided in the first container, the pre-cooling evaporator is located in the first air duct, a pre-heating condenser connected to the pre-cooling evaporator is provided in the third container, and the pre-heating condenser is located in the third air duct.

[0012] Further, access doors are provided at both ends of the first container, the second container, the third container and the fourth container.

[0013] Beneficial effects: Compared with the prior art, the present utility model has the following advantages:

[0014] 1. The heat pump unit is arranged in four containers, eliminating the need for building construction, saving infrastructure costs, reducing the floor area, and the containers can be directly connected or connected through pipelines and ducts, and the position can be adjusted to adapt to different installation environments;

[0015] 2. The container structure is compact, the air ducts are arranged inside the container, with high sealing performance, less heat loss, and high outlet air temperature, which can meet the requirements of the outlet air temperature for grain drying in autumn and winter;

[0016] 3. The containers are convenient to move, access doors are provided at both ends of the containers, and the internal equipment is convenient to maintain;

[0017] 4. According to different drying amounts, more than one of the four containers can be provided respectively and can be used in combination to adapt to different usage scenarios. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0019] Figure 2 is a schematic diagram of the heat pump pipeline connection structure;

[0020] Figure 3 It is a schematic structural diagram of a precooling evaporator and a preheating condenser. Specific embodiments

[0021] The following further clarifies the present invention in conjunction with specific embodiments. The embodiments are implemented on the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0022] As Figure 1 shown, a heat pump unit for container-type grain drying includes a first container 1, a second container 2, a third container 3, and a fourth container 4. All four containers adopt the unified IC-type standard container. The total floor area of the four containers does not exceed 150 square meters. The four containers are connected and placed side by side, and the first container 1, the second container 2, the third container 3, and the fourth container 4 are connected in sequence. According to different drying amounts, one or more of the first container 1, the second container 2, the third container 3, and the fourth container 4 can be provided.

[0023] Maintenance doors are provided at both ends of the first container 1, the second container 2, the third container 3, and the fourth container 4. The maintenance doors adopt the existing double-leaf doors of the container, which are convenient for personnel to open and enter for internal maintenance. There are channels for assembly, detection, repair, and maintenance inside the container, and problems found during operation can be solved by entering the inside of the container.

[0024] The first container 1 is provided with a first air duct, a dust removal filter screen 11, a precooling evaporator 12, and a first evaporator 13. The air inlet of the first air duct is arranged on one side of the first container 1. The air inlet of the first air duct is used to connect with the outlet of an external dryer. The high-temperature and humid air after drying the grain enters the first container 1 from the air inlet of the first air duct after being dust-removed by an external dust removal device. The dust removal filter screen 11 is arranged at the air inlet of the first air duct. The dust removal filter screen 11 is composed of multiple filter screens to filter and re-dust the high-temperature and humid air entering the first air duct, improve the dust removal effect, and prevent impurities from entering the container. The precooling evaporator 12 and the first evaporator 13 are located in the first air duct. The high-temperature and humid air passes through the precooling evaporator 12 and the first evaporator 13 in sequence for cooling and dehumidification. The air outlet of the first air duct is arranged on the other side of the first container 1. The dehumidified air is discharged from the air outlet of the first air duct. When the number of the first containers 1 is more than two, the cooling and dehumidification time can be extended, and the cooling and dehumidification effect can be improved.

[0025] The second container 2 is provided with a second air duct, a second evaporator 21, a compressor 22 and an expansion valve 23. The air inlet of the second air duct is arranged on one side of the second container 2, and the air inlet of the second air duct is directly communicated with the air outlet of the first air duct (or can be communicated through a pipeline). The second evaporator 21 is arranged in the second air duct, and the compressor 22 and the expansion valve are arranged outside the second air duct. The compressor 22 is a screw compressor or a scroll compressor. The air is cooled and dehumidified again through the second evaporator 21. The air outlet of the second air duct is arranged on the other side of the second container 2, and the dehumidified air is discharged from the air outlet of the second air duct. The number of the second containers 2 is set to be more than two, which can increase the number of compressors and improve the effects of air dehumidification and air heating.

[0026] The third container 3 is provided with a third air duct, a preheating condenser 31 and a first condenser 32. The air inlet of the third air duct is arranged on one side of the third container 3, and the air inlet of the third air duct is directly communicated with the air outlet of the second air duct (or can be communicated through a pipeline). The preheating condenser 31 and the first condenser 32 are arranged in the third air duct. The dry cold air is heated through the preheating condenser 31 and the first condenser 32. The air outlet of the third air duct is arranged on the other side of the third container 3, and the heated air is discharged from the air outlet of the third air duct.

[0027] The air outlet of the fourth air duct is provided with a fourth air duct, a second condenser 41 and an auxiliary electric heater 42. The air inlet of the fourth air duct is arranged on one side of the fourth container 4, and the air inlet of the fourth air duct is directly communicated with the air outlet of the third air duct (or can be communicated through a pipeline). The second condenser 41 and the auxiliary electric heater 42 are arranged in the fourth air duct. The air is heated to the required temperature through the second condenser 41 and the auxiliary electric heater 42. The air outlet of the fourth air duct is arranged on the other side of the fourth container 4, and the heated air is discharged from the air outlet of the fourth air duct. The air outlet of the fourth air duct is connected to the air inlet end of an external dryer. The dry and hot air dries the grains in the dryer, and then enters the container for circulation from the air inlet of the first air duct. The internal air circulates in this way until the moisture content of the grains reaches the requirement. When the number of the fourth containers 4 is set to be more than two, the heating time can be extended and the heating effect can be improved.

[0028] Such as Figure 1 and Figure 2As shown, the first evaporator 13 and the second evaporator 21 are connected in series to form an evaporator group. The evaporator group is connected to the compressor 22 and the expansion valve through pipelines. The first condenser 32 and the second condenser 41 are connected in series to form a condenser group. The condenser group is connected to the compressor 22 and the expansion valve through pipelines. The refrigerant circulates in the pipelines. The entire pipeline of the heat pump system is located inside the container. When the installation site is limited and there is a spacing between four containers, the refrigerant pipelines can be connected through external pipelines. The compressor is responsible for compressing low-pressure gas into high-pressure gas. In the condenser group, the high-pressure refrigerant releases heat and condenses, so that the condenser group can heat the air and reduce the relative humidity of the air, facilitating the air to enter the subsequent dryer to absorb the moisture evaporated from the surface of the grain. The expansion valve is arranged between the condenser group and the evaporator group, and controls the refrigerant flow by changing the throttle section or throttle length, so that the medium-temperature and high-pressure liquid refrigerant becomes low-temperature and low-pressure wet steam through throttling. In the evaporator group, the low-pressure refrigerant liquid absorbs heat and evaporates, cooling the high-temperature and humid air below the dew point temperature and separating out moisture. Thus, the evaporator group can cool and dehumidify the air.

[0029] As Figure 1 and Figure 3 shown, the precooling evaporator 12 is arranged in front of the first evaporator 13, so it is located upwind of the first evaporator 13. The preheating condenser 31 is arranged in front of the first condenser 32, so it is located upwind of the first condenser 32. The precooling evaporator 12 and the preheating condenser 31 are connected to form a U-shaped heat pipe. The working principle of the heat pipe is based on the evaporation and condensation process of the working fluid (the working fluid in this embodiment is ethylene glycol) in the pipe. When the evaporation section of the heat pipe (the precooling evaporator 12) is heated, the working fluid in the pipe vaporizes, and the vapor flows to the other end and releases heat and condenses into a liquid at the condensation section (the preheating condenser 31). The condensed liquid flows back to the evaporation section by the action of capillary force and gravity, and continues to evaporate and condense, forming a cycle. This process enables heat to be transferred from one end to the other end. The U-shaped heat pipe is an existing heat pipe, which can recover the heat in the humid and hot air and heat the dried air without consuming electric energy, saving energy and being environmentally friendly.

[0030] As Figure 2 shown, both the first evaporator 13 and the second evaporator 21 are finned evaporators. There is a water tank and a water pump in the first container 1. The evaporator is provided with a spray head connected to the water pump. Under the action of the water pump, the spray head sprays water towards the fins of the evaporator to clean the evaporator. Both the first condenser 32 and the second condenser 41 are finned condensers. The condenser is provided with a spray head connected to the water pump. Under the action of the water pump, the spray head sprays water towards the fins of the condenser to clean the condenser. Fin cleaning is beneficial to ensuring the heat exchange effect.

[0031] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A heat pump unit for container-type grain drying, characterized in that, It includes a first container (1), a second container (2) communicating with the first container (1), a third container (3) communicating with the second container (2), and a fourth container (4) communicating with the third container (3). A first evaporator (13) is provided in the first container (1), a compressor (22) connected to the first evaporator (13) and an expansion valve (23) connected to the first evaporator (13) are provided in the second container (2), a first condenser (32) connected to the compressor (22) is provided in the third container (3), and a second condenser (41) connected to the compressor (22) is provided in the fourth container (4).

2. The heat pump unit for container-type grain drying according to claim 1, characterized in that A first air duct is provided in the first container (1), the first evaporator is located in the first air duct, a dust removal filter screen (11) is provided at the air inlet of the first air duct, a second air duct communicating with the first air duct is provided in the second container (2), a second evaporator (21) connected to the compressor (22) is provided in the second air duct, and the compressor (22) is arranged outside the second air duct.

3. The heat pump unit for container-type grain drying according to claim 2, characterized in that, A third air duct communicating with the second air duct is provided in the third container (3), the first condenser (32) is arranged in the third air duct, a fourth air duct communicating with the third air duct is provided in the fourth container (4), and the second condenser (41) is arranged in the fourth air duct.

4. The heat pump unit for container-type grain drying according to claim 3, characterized in that, An auxiliary electric heater (42) is provided at the air outlet of the fourth air duct.

5. The heat pump unit for container-type grain drying according to claim 3, wherein, The air inlet of the first air duct is arranged on one side of the first container (1), the air outlet of the first air duct is arranged on the other side of the first container (1), the air inlet of the second air duct is arranged on one side of the second container (2), the air outlet of the second air duct is arranged on the other side of the second container (2), the air inlet of the third air duct is arranged on one side of the third container (3), the air outlet of the third air duct is arranged on the other side of the third container (3), the air inlet of the fourth air duct is arranged on one side of the fourth container (4), and the air outlet of the fourth air duct is arranged on the other side of the fourth container (4).

6. The heat pump unit for container-type grain drying according to claim 5, characterized in that, The air outlet of the first air duct is directly connected or connected by a pipeline to the air inlet of the second air duct, the air outlet of the second air duct is directly connected or connected by a pipeline to the air inlet of the third air duct, and the air outlet of the third air duct is directly connected or connected by a pipeline to the air inlet of the fourth air duct.

7. The heat pump unit for container-type grain drying according to claim 3, wherein, A pre-cooling evaporator (12) is provided in the first container (1), the pre-cooling evaporator (12) is located in the first air duct, a pre-heating condenser (31) connected to the pre-cooling evaporator (12) is provided in the third container (3), and the pre-heating condenser (31) is located in the third air duct.

8. The heat pump unit for container-type grain drying according to claim 1, characterized in that Maintenance doors are provided at both ends of the first container (1), the second container (2), the third container (3) and the fourth container (4).

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