Refrigerating unit capable of satisfying temperature control of live aquatic product railway transportation

Abstract

The application provides a refrigerating unit capable of meeting temperature control of railway transportation of live aquatic products, comprising a water temperature control refrigerating system, an airflow temperature control refrigerating system, a supply air module and a plurality of heat preservation water tank modules; wherein the water temperature control refrigerating system uses low-temperature refrigerant to provide strong refrigerating capacity, which is used for adjusting water temperature of the heat preservation water tank modules on one hand and pre-cooling pressurized airflow through a pre-cooling coil on the other hand; the airflow temperature control refrigerating system performs secondary refrigeration on the pre-cooled pressurized air to reach the required temperature and meet the requirement of long-distance transmission, thereby achieving the purpose of railway transportation temperature control.

Description

Technical Field

[0001] This invention relates to the field of cold chain transportation technology, and more specifically, to a refrigeration unit that can meet the temperature control requirements for railway transportation of live aquatic products. Background Technology

[0002] Currently, railway cold chain transportation can achieve seamless integration with international cold chain transportation, mainly handling the transport of fresh and perishable goods, playing a vital role in maintaining the quality and health of goods. Through market research and literature review, the fresh and perishable goods transported by railway cold chain transportation are mainly meat, vegetables, fruits, and medicines with special temperature requirements. However, the cold chain transportation of live aquatic products has not been widely applied or promoted. After analysis and research, the main reason is that there is very little railway cold chain transportation equipment for fresh and live aquatic products, and the core and critical refrigeration units in railway transportation equipment are not mentioned at all. At present, there is still a lack of refrigeration units for temperature control in the railway transportation of live aquatic products.

[0003] Furthermore, according to the transportation management requirements of GB / T36192 "Technical Specifications for the Transportation of Live Aquatic Products" and GB / T27638 "Technical Specifications for the Transportation of Live Fish", there are clear requirements for the carrying water temperature and fluctuation range during the transportation of different live aquatic products. By lowering the carrying water temperature to the ecological freezing point of the live aquatic products, they can enter a dormant state, which can reduce the respiration heat of the live aquatic products during transportation, minimize the mortality rate of live aquatic products during transportation, and enhance the economic efficiency of the transportation process. At the same time, since there are requirements for the oxygen content of the environment, it is also necessary to achieve synchronous regulation of the air temperature.

[0004] The main difference between the requirements for refrigeration units in railway cold chain transportation and those for conventional refrigerated vehicles is that the trains in the railway cold chain are longer, and the refrigerant and cold air transport paths are also longer. They need to be pressurized and pushed, and the increased pressure will inevitably lead to an increase in temperature, making conventional refrigeration units unsuitable for railway needs.

[0005] To achieve the above objectives, people have been seeking an ideal technological solution. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a refrigeration unit that can meet the air pressure and temperature requirements of long railway transport routes without conflict, and whose air and water temperature stability meets the standards, thus satisfying the temperature control requirements for railway transport of live aquatic products.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a refrigeration unit that can meet the temperature control requirements for railway transportation of live aquatic products, including a water temperature control refrigeration system, an airflow temperature control refrigeration system, an air supply module, and several insulated water tank modules;

[0008] The water temperature control refrigeration system includes a water temperature control compressor, a first oil-water separator, a first condenser, a first liquid receiver, an electronic expansion valve, a solenoid valve, a heat exchange coil, a precooling coil, and a first gas-liquid separator connected in sequence to form a loop. The first gas-liquid separator is connected to the loop of the water temperature control compressor. A steam pressure sensor and a steam temperature sensor are installed on the inlet of the first gas-liquid separator. The refrigerant used in the water temperature control refrigeration system is a refrigerant with an evaporation temperature below -10°C.

[0009] The airflow temperature control refrigeration system includes an airflow temperature control compressor, a second oil-gas separator, a second condenser, a second liquid receiver, a thermal expansion valve, an evaporator core, and a second gas-liquid separator connected in sequence to form a loop. The second gas-liquid separator is connected to the loop of the airflow temperature control compressor.

[0010] The solenoid valves and heat exchange coils are arranged in groups in each insulated water tank module, and the solenoid valves and heat exchange coils of different groups are connected in parallel to the pipeline between the electronic expansion valve and the precooling coil.

[0011] The air supply module includes an air supply cabinet, which houses an air supply fan, a first pressure equalizing orifice plate, the precooling coil, a second pressure equalizing orifice plate, an evaporator core, an outlet air temperature sensor, and an insulated air supply duct. The air supply fan is used to introduce pressurized airflow into the air supply cabinet. The first pressure equalizing orifice plate, the precooling coil, the second pressure equalizing orifice plate, the evaporator core, and the insulated air supply duct are arranged according to the airflow direction. The first pressure equalizing orifice plate is used to disperse the airflow to the precooling coil, and the second pressure equalizing orifice plate is used to disperse the airflow to the evaporator core. The outlet air temperature sensor is installed at the inlet of the insulated air supply duct. The branches of the insulated air supply duct are connected to each insulated water tank module and are equipped with air valve regulators.

[0012] Based on the above, each of the insulated water tank modules is equipped with a water temperature sensor, which is associated with the water temperature control refrigeration system and controls the opening and closing of the solenoid valve according to the temperature in the insulated water tank module.

[0013] Based on the above, each of the insulated water tank modules is equipped with an oxygen concentration sensor, which is associated with the airflow temperature control refrigeration system and adjusts the opening of the air valve regulator according to the oxygen content in the insulated water tank module.

[0014] Based on the above, the refrigerant type of the water temperature control refrigeration system is R404a.

[0015] Based on the above, the air supply temperature of the air supply unit is 50-60°C, the temperature range of the precooling coil is -15 to -10°C, and the air temperature after passing through the precooling coil is 25-30°C.

[0016] Based on the above, the two condensers of the water temperature control refrigeration system and the airflow temperature control refrigeration system share a common installation structure to form a condensing assembly, which is separated by a partition and each is equipped with a condensing cooling fan.

[0017] Based on the above, the heat exchange coil is a titanium coil, and the insulated water tank module is provided with an insulation material layer.

[0018] Based on the above, the power supply system of the water temperature control refrigeration system, the airflow temperature control refrigeration system, the air supply module and several insulated water tank modules is a multi-in-one mode, including a diesel generator set, a high-voltage battery set and a mains power grid power supply set. The output of the power supply system is divided into AC380V power, AC220V power and DC12V control power.

[0019] Based on the above, the temperature at the air supply terminal of the insulated air supply duct is 12-15°C.

[0020] Based on the above, the air supply pressurization method of the air supply unit adopts mechanical pressurization.

[0021] This invention has outstanding substantive features and significant progress compared to the prior art. Specifically, this invention has the following advantages:

[0022] 1. According to standard requirements, the evaporation temperature needed to offset heat leakage from the water tank is -15 to -10°C, while the evaporation temperature for reducing oxygen supply is generally 0-5°C. Since the evaporation temperatures of the two refrigeration systems differ, two separate systems are required. Furthermore, railway gas supply requires pressurization to offset pipeline resistance, and the temperature after pressurization rises to 50-60°C. Conventional refrigeration systems can only achieve a return air temperature difference of around 12°C, which cannot meet the temperature requirements of the live water products for the supply air. Based on these conditions, this project uses R404A refrigerant in the water temperature control refrigeration system. The supply air is treated with a two-stage cooling process: the pressurized air is first pre-cooled by a pre-cooling coil to 25-30°C, and then further cooled by the evaporator core of the airflow temperature control refrigeration system to around 15°C before being delivered to each insulated water tank module. This temperature does not cause a rise in water temperature and also meets the oxygen supply requirements.

[0023] 2. By using sensors such as water temperature sensors, oxygen content sensors, and temperature sensors, and in conjunction with the control of solenoid valves and air valve regulators, the output water temperature, airflow temperature, and air flow can be controlled in real time to maintain the water temperature within a stable range.

[0024] 3. This invention can not only maintain the water temperature, but also reduce the air temperature that rises due to mechanical pressurization, while maintaining the oxygen content in the insulated water tank. Moreover, multiple power supply drives can be used in the transportation chain, which reduces the mortality rate of live aquatic products during transportation and improves the economic value of railway transportation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structural distribution of the refrigeration unit in this invention, which can meet the temperature control requirements for railway transportation of live aquatic products.

[0026] Figure 2 This is a schematic diagram of the working principle of the refrigeration unit in this invention, which can meet the temperature control requirements for railway transportation of live aquatic products.

[0027] Figure 3 This invention relates to a refrigeration unit that can meet the temperature control requirements for railway transportation of live aquatic products.

[0028] In the diagram: 1. Airflow temperature controlled compressor; 2-1. First high-pressure switch; 2-2. Second high-pressure switch; 3-1. First oil-gas separator; 3-2. Second oil-gas separator; 4-1. First condenser; 4-2. Second condenser; 5-1. First condenser fan; 5-2. Second condenser fan; 6-1. First liquid storage tank; 6-2. Second liquid storage tank; 7. Thermal expansion valve; 8. Air supply cabinet; 8-1. Evaporator core; 8-2. First pressure equalizing orifice plate; 8-3. Precooling coil; 8-4. Air supply fan; 8-5. Second pressure equalizing orifice plate; 9-1. First gas-liquid separator; 10-1. Low-pressure switch; 11. Water temperature controlled compressor; 12. Electronic expansion valve; 19. Steam pressure sensor; 20. Steam temperature sensor; 21. Outlet air temperature sensor; 22. Insulated air supply duct. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0030] According to the transportation management requirements of GB / T36192 "Technical Specifications for the Transportation of Live Aquatic Products" and GB / T27638 "Technical Specifications for the Transportation of Live Fish", there are clear requirements for the water temperature and fluctuation range during the transportation of different live aquatic products. According to the requirements for water transportation status, the temperature of live aquatic products has been lowered to the ecological ice temperature point before loading, so that they enter a dormant state. Therefore, the refrigeration system load during railway transportation is mainly the heat load caused by the heat leakage of the insulated water tank and the water temperature rise caused by the oxygen supply temperature. However, from the perspective of refrigeration system analysis, the evaporation temperature of the refrigeration system that offsets the heat leakage of the insulated water tank is generally between -15 and -10℃, and the evaporation temperature of the refrigeration system that lowers the oxygen supply temperature is generally between 0 and 5℃. The evaporation temperatures of the two sets of refrigeration systems are different, and it is impossible to take care of both heat load requirements with one set of refrigeration system. Two independent refrigeration systems need to be configured.

[0031] Furthermore, in order to supply oxygen to the inside of the insulated water tank, the natural air needs to be pressurized to counteract the resistance of the air supply duct, extend the air supply distance, and meet the oxygen supply requirements. Under the most unfavorable ambient temperature, the temperature of the pressurized air will rise to 50°C to 60°C. In conventional refrigeration systems on the market, the temperature difference between the supply and return air after the air passes through the evaporator core is generally around 12°C, which cannot meet the temperature requirements of the supply air for live water products. This embodiment is mainly used to solve this problem.

[0032] In this embodiment, according to specifications, the water temperature range for live aquatic products is generally between 3°C and 12°C, and the water temperature has been adjusted to the required temperature before shipment.

[0033] like Figure 1 As shown, in terms of installation location and structure, it is mainly divided into equipment compartment and insulated water tank compartment. The equipment compartment contains water temperature control compressor, airflow temperature control compressor, air handling cabinet, condenser assembly, electronic expansion valve and other related components. According to the total size and volume of the box, four insulated water tank compartments are arranged. Each insulated water tank compartment is equipped with an independent solenoid valve and titanium tube coil water cooling device and air supply (oxygen supply) device with air valve regulator. The water temperature of the four insulated water tanks can be controlled independently.

[0034] like Figure 2 As shown, specifically, a refrigeration unit that can meet the temperature control requirements for railway transportation of live aquatic products includes a water temperature control refrigeration system, an airflow temperature control refrigeration system, an air supply module, and several insulated water tank modules.

[0035] The water temperature control refrigeration system includes a water temperature control compressor 11 connected in sequence to form a circuit, a first high-pressure switch 2-1, a first oil-water separator 3-1, a first condenser 4-1, a first liquid receiver 6-1, an electronic expansion valve 12, a solenoid valve, a titanium tube coil, a precooling coil 8-3, and a first gas-liquid separator 9-1. The first gas-liquid separator 9-1 is connected to the circuit of the water temperature control compressor 11 through a first low-pressure switch 10-1. A steam pressure sensor 19 and a steam temperature sensor 20 are installed on the inlet of the first gas-liquid separator 9-1. The refrigerant used in the water temperature control refrigeration system is a refrigerant with an evaporation temperature below -10°C, such as R404A, whose evaporation temperature is between -15°C and -10°C, and can even reach as low as -30°C.

[0036] The airflow temperature control refrigeration system includes an airflow temperature control compressor 1 connected in sequence to form a circuit, a second high-pressure switch 2-1, a second oil-gas separator 3-2, a second condenser 4-2, a second liquid receiver 6-2, a thermal expansion valve 7, an evaporator core 8-1, and a second gas-liquid separator 9-2. The second gas-liquid separator 9-2 is connected to the circuit of the airflow temperature control compressor 1 through a second low-pressure switch 10-2. The refrigerant of the airflow temperature control refrigeration system can also be R404A, but its evaporation temperature requirement is lower, only 0-5°C is required.

[0037] In this embodiment, the solenoid valves and titanium tube coils are arranged in groups in each insulated water tank module. The insulated water tank module is provided with an insulation material layer. Specifically, in this embodiment, four insulated water tanks are provided, which are numbered 18-1, 18-2, 18-3, and 18-4 respectively. There are four solenoid valves, which are numbered 13-1, 13-2, 13-3, and 13-4 respectively. There are four titanium tube coils, which are numbered 15-1, 15-2, 15-3, and 15-4 respectively. The four groups of solenoid valves and titanium tube coils are connected in parallel to the pipeline between the electronic expansion valve 12 and the precooling coil 8-3.

[0038] The air supply module includes an air supply cabinet 8, which houses an air supply fan 8-4, a first pressure equalizing orifice plate 8-2, a precooling coil 8-3, a second pressure equalizing orifice plate 8-5, an evaporator core 8-1, an outlet air temperature sensor 21, and an insulated air supply duct 22. The air supply fan 8-4 introduces pressurized airflow into the air supply cabinet 8. The first pressure equalizing orifice plate 8-2, the precooling coil 8-3, the second pressure equalizing orifice plate 8-5, the evaporator core 8-1, and the insulated air supply duct 22 are arranged according to the airflow direction. The first pressure equalizing orifice plate 8-2 disperses the pressurized airflow of 50-60°C to the precooling coil 8-3. -3, so that the airflow can fully contact and exchange heat with the precooling coil 8-3, so that the air temperature is reduced to about 25-30°C, which meets the achievable return air temperature difference of a general air conditioning system. The second pressure equalizing plate 8-5 is used to disperse the airflow to the evaporator core 8-1, further reducing the airflow temperature to about 15°C. The outlet air temperature sensor 21 is installed at the inlet of the insulated air supply duct 22. The branches of the insulated air supply duct 22 are connected to each insulated water tank module and are respectively equipped with air valve regulators. There are four air valve regulators, which are represented by serial numbers in this embodiment as: 14-1, 14-2, 14-3, and 14-4.

[0039] Each of the aforementioned insulated water tank modules is equipped with water temperature sensors 16-1, 16-2, 16-3, and 16-4. These water temperature sensors are associated with the water temperature control refrigeration system and control the on / off state of the solenoid valve based on the temperature in the insulated water tank module.

[0040] Each of the aforementioned insulated water tank modules is equipped with oxygen concentration sensors 17-1, 17-2, 17-3, and 17-4. These oxygen concentration sensors are associated with the airflow temperature control refrigeration system and adjust the opening of the air valve regulator according to the oxygen content in the insulated water tank module.

[0041] In this embodiment, the two condensers of the water temperature control refrigeration system and the airflow temperature control refrigeration system share a common installation structure to form a condensing assembly, which is separated by a partition and each is equipped with a condensing cooling fan.

[0042] like Figure 3 As shown, in order to meet the multi-functional power supply requirements of the refrigeration unit, the power supply assembly input can support three power supply methods: diesel generator, high-voltage battery, and mains power grid. That is, the power supply assembly of the water temperature control refrigeration system, airflow temperature control refrigeration system, air supply module and several insulated water tank modules is a multi-in-one mode. The output of the power supply assembly is divided into AC380V power, AC220V power, and DC12V control power, which can meet the full-chain power supply scheme. The power supply assembly then distributes the power to each electrical device according to the voltage type required by the load and the load, realizes control drive, and forms a complete refrigeration unit control scheme.

[0043] Working principle:

[0044] The working process of the water temperature control refrigeration system is as follows: R404a refrigerant is compressed and pressurized by the water temperature control compressor 11 and then flows to the condenser 5-1 to dissipate heat, becoming a medium-high temperature liquid refrigerant that flows to the liquid receiver 6-1. After being throttled by the electronic expansion valve 12, a phase change occurs, forming a low-temperature, low-pressure gas-liquid mixture. In order to ensure the evaporation temperature of the titanium tube coil, the controller limits the maximum opening of the electronic expansion valve to ensure that the evaporation temperature is not higher than -10℃. Each branch pipe is equipped with a solenoid valve, and the opening and closing of the solenoid valve is determined in real time according to the value of the water temperature sensor.

[0045] After each branch circuit converges, it passes through the air handling unit 8. Inside the air handling unit 8, the pre-cooling coil 8-3 is used to pre-cool the pressurized air. The temperature range of the pre-cooling coil is -15 to -10℃. The temperature of the mechanically pressurized air is 50 to 60℃, which is a relatively large temperature difference. After passing through the first pressure equalization plate, the air is evenly distributed and pre-cooled to 25 to 30℃.

[0046] The refrigerant after passing through the precooling coil 8-3 will absorb heat again. The opening of the electronic expansion valve is adjusted according to the evaporation pressure sensor 19 and the evaporation temperature sensor 20 to simultaneously meet the refrigerant flow requirements of the titanium coil and the precooling coil in the water tank. The refrigerant flowing out of the precooling coil is further separated by the gas-liquid separator to protect the compressor from liquid compression. The refrigerant flows back to the compressor to complete the refrigeration cycle.

[0047] The working process of the airflow temperature control refrigeration system is as follows: the high-temperature and high-pressure R404a gaseous refrigerant discharged by the airflow temperature control compressor 1 is filtered by the second oil-gas separator 3-2 to remove the discharged oil, and then condensed by the condenser 5-2 into a medium-high temperature liquid stored in the liquid receiver 6-2. After passing through the thermal expansion valve 7, it is throttled into a low-temperature and low-pressure gas-liquid mixture, with the evaporation temperature controlled between 0 and 5°C. After the refrigerant exchanges heat with the pre-cooled 25-30°C air through the evaporator core 8-1, it is protected by the gas-liquid separator 9-2 and then flows back to the compressor to complete the refrigeration cycle. At the same time, the temperature of the pre-cooled air is about 15°C after secondary cooling, which meets the air supply temperature requirements of the insulated water tank.

[0048] The air supply adopts mechanical pressurization. After the fresh air is pressurized, the temperature will rise to 50 to 60°C and the pressure will rise to a pressure value that can overcome the resistance of the insulated air supply duct 22, ensuring that the requirements of the longest air supply distance and air volume are met. Branch pipes are added to each insulated water tank of the air supply duct, and air valve regulators are added to the air supply inlet to balance the flow demand of each branch pipe.

[0049] In summary, this invention patent treats the air supply as a two-stage cooling process. First, using R404a refrigerant achieves a lower evaporation temperature while maintaining a larger heat exchange temperature difference, thus rapidly cooling the air supply and quickly compensating for cooling loss in the insulated water tank. Figure 2 As shown, the water temperature control system and the airflow temperature control system are two independent refrigeration systems. Therefore, the evaporation temperatures of the two refrigeration systems are also different. The refrigerant in the titanium tube coil after the water temperature control system is throttled by the electronic expansion valve has an evaporation temperature of -15℃ to -10℃. After the refrigerant absorbs heat in the titanium tube coil, it flows to the airflow precooling coil in the air handling unit to exchange heat with the pressurized high-temperature air, thereby achieving the purpose of air precooling and reducing the air temperature from 50℃ to 60℃ to about 30℃. The refrigerant after absorbing heat finally flows back to the compressor to complete the refrigeration cycle of the water temperature control compressor.

[0050] The airflow temperature control compressor refrigeration system uses a thermostatic expansion valve for throttling control. The evaporation temperature of the refrigerant in the evaporator core is about 0℃ to 5℃. After pre-cooling, the air at about 30℃ undergoes heat exchange, and the temperature at the air outlet is about 15℃. The air after secondary cooling is sent to each insulated water tank through an insulated air duct to replenish oxygen and maintain a suitable oxygen content.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A refrigeration unit that can satisfy the temperature control of railway transport of live aquatic products, characterized by: The application relates to a water temperature control refrigeration system, an air flow temperature control refrigeration system, a supply air module and a plurality of heat preservation water tank modules. The water temperature control refrigeration system comprises a water temperature control compressor, a first oil-water separator, a first condenser, a first liquid accumulator, an electronic expansion valve, an electromagnetic valve, a heat exchange coil, a precooling coil and a first gas-liquid separator which are sequentially connected and form a loop, the first gas-liquid separator is connected to the loop of the water temperature control compressor, a steam pressure sensor and a steam temperature sensor are arranged on the inlet of the first gas-liquid separator, and the refrigerant of the water temperature control refrigeration system is selected to be a refrigerant with an evaporation temperature lower than -10 DEG C. The air flow temperature control refrigeration system comprises an air flow temperature control compressor, a second oil-gas separator, a second condenser, a second liquid accumulator, a thermal expansion valve, an evaporation core and a second gas-liquid separator which are sequentially connected and form a loop. The electromagnetic valves and the heat exchange coils are arranged in groups in the heat preservation water tank modules, and the pipelines between different groups of electromagnetic valves and heat exchange coils are connected in parallel between the electronic expansion valve and the precooling coil. The supply air module comprises a supply air cabinet, a supply air fan, a first pressure equalizing hole plate, the precooling coil, a second pressure equalizing hole plate, an evaporator core, an outlet air temperature sensor and a heat preservation supply air pipeline, the supply air fan is used for guiding the air flow into the supply air cabinet, the first pressure equalizing hole plate, the precooling coil, the second pressure equalizing hole plate, the evaporator core and the heat preservation supply air pipeline are arranged according to the air flow direction, the first pressure equalizing hole plate is used for dispersing the air flow to the precooling coil, the second pressure equalizing hole plate is used for dispersing the air flow to the evaporator core, the outlet air temperature sensor is arranged at the inlet of the heat preservation supply air pipeline, and the heat preservation supply air pipeline is branched and connected to the heat preservation water tank modules and is respectively provided with a damper regulator.

2. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 1, characterized in that: A water temperature sensor is arranged in each heat preservation water tank module, the water temperature sensor is associated with the water temperature control refrigeration system, and the on-off of the electromagnetic valve is controlled according to the temperature in the heat preservation water tank module.

3. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 1 or 2, characterized in that: An oxygen concentration sensor is arranged in each heat preservation water tank module, the oxygen concentration sensor is associated with the air flow temperature control refrigeration system, and the opening degree of the damper regulator is adjusted according to the oxygen content in the heat preservation water tank module.

4. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 1 or 2, characterized in that: The refrigerant model of the water temperature control refrigeration system is R404a.

5. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 1 or 2, characterized in that: The supply air temperature of the supply air cabinet is 50-60 DEG C, the temperature range of the precooling coil is -15 to -10 DEG C, and the air temperature after the precooling coil is 25-30 DEG C.

6. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 5, characterized in that: The two sets of condensers of the water temperature control refrigeration system and the air flow temperature control refrigeration system share a mounting structure to form a condensing assembly, are separated by a partition plate and are respectively provided with condensing cooling fans.

7. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 6, characterized in that: The heat exchange coil is a titanium pipe coil, and a heat preservation material layer is arranged outside the heat preservation water tank module.

8. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 1 or 2 or 6 or 7, characterized in that: The power supply assembly of the water temperature control refrigeration system, the air flow temperature control refrigeration system, the air supply module and the plurality of heat preservation water tank modules is in a multi-in-one mode, including a diesel generator set, a high-voltage battery set and a power grid power supply set, and the output of the power supply assembly is divided into AC380v power, AC220v power and DC12v control power.

9. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 1 or 2 or 6 or 7, characterized in that: The air supply end temperature of the air supply pipe with heat preservation is 12-15°C.

10. The reefer unit capable of meeting live seafood rail transport temperature control according to claim 1 or 2 or 6 or 7, characterized in that: The air supply pressurization mode of the air supply cabinet adopts mechanical pressurization.

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