Quick-freezing system of refrigerator car

Abstract

A quick-freezing system of a refrigerator car relates to the technical field of refrigerating systems and comprises a pre-cooling module, an expansion compression module, an air purification module, a cold storage module, an air liquefaction module and a release module which are sequentially connected in series. The precooling module is also independently connected with the release module through the heat preservation module; the air liquefaction module comprises a gas-liquid separator, the liquid outlet end of the gas-liquid separator is connected with a liquid air storage tank, the release module comprises an atomization ejector connected with the interior of the compartment, and the outlet end of the liquid air storage tank is connected with the inlet end of the atomization ejector through a liquid air pump. The problems that in the prior art, a refrigerator car adopts a vehicle-mounted refrigerating unit for cooling and fresh keeping, marine products cannot be quickly frozen on site, the refrigerator car needs to be driven to a quick-freezing workshop, external quick-freezing equipment is used, and the transportation time efficiency of the marine products is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration systems, and in particular to a quick-freezing system for a refrigerated truck. Background Art

[0002] Quick freezing is a preservation technology developed in recent years. Through a special low-temperature method, the temperature of seafood is sharply reduced. Due to the rapid temperature drop, the water in the cells of seafood does not have time to freeze, causing the food to quickly form tiny ice crystals, avoiding the formation of large ice crystals between cells and reducing the outward release of water from cells. Therefore, the muscle structure of seafood is not damaged. After thawing, the product has less juice loss and better taste, ensuring that the flavor is not lost, maintaining the original nutrients of the ingredients, and its quality and taste are preserved to the maximum extent. This is currently the best preservation method. The distribution of seafood requires the use of refrigerated trucks, which must be equipped with refrigeration units to achieve low-temperature preservation of seafood. Since quick-freezing preservation is currently one of the best preservation methods, refrigeration units with quick-freezing function are a development trend.

[0003] Commonly used methods for quick freezing of seafood are: Liquid carbon dioxide spray quick freezing: Spray liquid carbon dioxide onto seafood, instantly lowering the temperature to below -78.5°C, so that the center temperature of the frozen object passes through the maximum ice crystal formation area from room temperature to freeze rapidly; Liquid nitrogen quick freezing method: Using the extremely low temperature of liquid nitrogen (-196°C), put the seafood into a sealed plastic bag, remove the air and compress the bag as much as possible, put the bag into a liquid nitrogen tank, and wait for a while until the seafood is completely frozen.

[0004] The prior art discloses a patent with a publication number of CN112856867A. The refrigeration unit for a refrigerated vehicle includes a condenser assembly, an evaporator assembly and a compressor, wherein the condenser assembly is installed in front of the outside of the refrigerated compartment, the condenser assembly includes a condenser arranged at least partially above the top plate of the cab, the outlet of the compressor is connected to the inlet of the condenser, and when installing the refrigerated vehicle refrigeration unit, there is no need to cut the top of the cab or reduce the volume of the refrigerated compartment.

[0005] As the existing technologies including the above patents are used, their shortcomings are gradually exposed, mainly in the following aspects: First, existing refrigerated trucks use on-board refrigeration units to cool and preserve seafood, and are unable to quickly freeze seafood on site. As a result, the refrigerated trucks need to be driven to quick-freezing workshops and use external quick-freezing equipment, which affects the transportation timeliness of seafood.

[0006] Second, the existing quick freezing methods are liquid carbon dioxide spray quick freezing or liquid nitrogen quick freezing. The existing quick freezing media not only have high production costs, but also high operating risk factors, posing great safety hazards to the quick freezing process of seafood.

[0007] Third, existing new energy refrigerated trucks use batteries to drive refrigeration units, which seriously affects the vehicle's range and requires frequent charging, affecting the transportation time of seafood.

[0008] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0009] In view of the defects in the prior art, the present invention provides a refrigerated truck quick-freezing system to solve the problem that in traditional technology, refrigerated trucks use an on-board refrigeration unit to cool and preserve seafood, but are unable to quickly freeze seafood on site, so that the refrigerated truck needs to be driven to a quick-freezing workshop and use external quick-freezing equipment, which affects the transportation timeliness of seafood.

[0010] To achieve the above object, the present invention provides the following technical solutions: A refrigerated truck quick freezing system comprises a pre-cooling module, an expansion compression module, an air purification module, a cold storage module, an air liquefaction module and a release module connected in series in sequence; The precooling module is also independently connected to the release module via the heat preservation module; The air liquefaction module comprises a gas-liquid separator, the liquid outlet end of the gas-liquid separator is connected to a liquid air storage tank, The release module comprises an atomizing injector connected to the interior of the vehicle compartment, and the outlet end of the liquid air storage tank is connected to the inlet end of the atomizing injector via a liquid air pump.

[0011] As an optimized solution, the precooling module includes an air compression pump, which is connected to a primary cooling water remover; the expansion compression module includes an expansion compressor, and the air outlet of the expansion compressor is connected to a secondary cooling water remover.

[0012] As an optimized solution, the air outlet end of the primary cooling water remover is connected to the air inlet end of the expansion compressor.

[0013] As an optimized solution, the insulation module includes an insulation pipeline connected to the air outlet end of the primary cooling water remover, and the insulation pipeline is connected to the atomizing injector.

[0014] As an optimized solution, the heat exchange coil in the primary cooling water remover and the heat exchange coil in the secondary cooling water remover are connected to a circulating radiator through corresponding primary heat dissipation pipelines and secondary heat dissipation pipelines. The heat dissipation port of the circulating radiator is connected to the outside world and the cab through a three-way pipeline.

[0015] As an optimized solution, the gas outlet end of the gas-liquid separator is connected to the gas inlet end of the air compression pump through a circulation pipeline.

[0016] As an optimized solution, the cold storage module includes a cold storage heat exchanger, the heat exchange coil in the cold storage heat exchanger is connected to the expansion end of the expansion compressor through an expansion pipeline, and the gas outlet end of the cold storage heat exchanger is connected to the gas-liquid separator.

[0017] As an optimized solution, the air purification module includes an adsorber connected to the air outlet end of the secondary cooling water remover, and the air outlet end of the adsorber is connected to the air inlet end of the cold storage heat exchanger through a high-pressure compressor.

[0018] As an optimized solution, a first valve is connected to the insulation pipeline.

[0019] As an optimized solution, a second valve is connected between the air outlet end of the primary cooling water remover and the air inlet end of the expansion compressor.

[0020] As an optimized solution, the liquid outlet of the primary cooling water remover is connected to a third valve.

[0021] As an optimized solution, a fourth valve is connected to the liquid outlet of the secondary cooling water remover.

[0022] As an optimized solution, a fifth valve is connected to the lower end of the adsorber.

[0023] As an optimized solution, a sixth valve is provided between the inlet end of the atomizing injector and the liquid air pump.

[0024] As an optimized solution, an air subdivision filter is connected to the air inlet end of the air compression pump.

[0025] As an optimized solution, the primary heat dissipation pipeline is connected to a primary cooling circulation pump, and the secondary heat dissipation pipeline is connected to a secondary cooling circulation pump.

[0026] Compared with the prior art, the present invention has the following beneficial effects: By equipping the carriage with a pre-cooling module, an expansion and compression module, an air purification module, a cold storage module, an air liquefaction module and a release module, the carriage can be equipped with a quick-freezing function, and seafood can be quickly frozen on site without driving the vehicle to a quick-freezing workshop, thus ensuring the efficiency of seafood loading and unloading, as well as the transportation timeliness of seafood; The refrigerated truck uses the mains electricity to store cold before driving, and quickly freezes the seafood by connecting to the mains electricity, thus reducing the power consumption of the new energy vehicle battery; During the driving process, the vehicle only needs to keep warm. Since most of the power-consuming components are turned off, the power consumption is low, which can effectively increase the mileage of the refrigerated truck and save vehicle energy. Using conventional compressed air as a quick freezing medium, a low-cost way to quick freeze seafood, ensuring flavor and taste, and with a lower risk factor than liquid carbon dioxide and liquid nitrogen; Using air as the refrigerant, it is possible to use mains electricity during the loading and unloading of seafood to prepare liquid compressed air for cold storage and quick freezing. During the transportation of the refrigerated truck, the on-board battery is used to drive the refrigeration unit for insulation. It combines the functions of cold storage, quick freezing, and insulation, fully utilizes the different working time periods of the refrigerated truck, and is highly efficient and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] In the figure: 1. air subdivision filter; 2. air compression pump; 3. primary cooling water remover; 4. expansion compressor; 5. secondary cooling water remover; 6. expansion end; 7. adsorber; 8. high-pressure compressor; 9. cold storage heat exchanger; 10. gas-liquid separator; 11. liquid air storage tank; 12. liquid air pump; 13. atomizing ejector; 14. carriage; 15. primary cooling circulation pump; 16. secondary cooling circulation pump; 17. circulation radiator; 18. primary heat dissipation pipeline; 19. secondary heat dissipation pipeline; 20. insulation pipeline; 21. circulation pipeline; 22. first valve; 23. second valve; 24. third valve; 25. fourth valve; 26. fifth valve; 27. sixth valve; 28- three-way pipeline. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0031] like Figure 1 As shown, the refrigerated truck quick freezing system includes a pre-cooling module, an expansion and compression module, an air purification module, a cold storage module, an air liquefaction module and a release module connected in series in sequence; The precooling module is also independently connected to the release module through the insulation module; The air liquefaction module includes a gas-liquid separator 10, and the liquid outlet of the gas-liquid separator 10 is connected to a liquid air storage tank 11. The release module includes an atomizing injector 13 connected to the interior of a carriage 14 , and an outlet end of a liquid air storage tank 11 is connected to an inlet end of the atomizing injector 13 via a liquid air pump 12 .

[0032] The precooling module comprises an air compression pump 2 , which is connected to a primary cooling water remover 3 ; the expansion compression module comprises an expansion compressor 4 , and an air outlet end of the expansion compressor 4 is connected to a secondary cooling water remover 5 .

[0033] The air outlet end of the primary cooling water remover 3 is connected to the air inlet end of the expansion compressor 4 .

[0034] The heat preservation module includes a heat preservation pipeline 20 connected to the gas outlet of the primary cooling water remover 3, and the heat preservation pipeline 20 is connected to the atomizing injector 13. During the driving of the refrigerated truck, only the pre-cooling module is turned on to keep the temperature of the compartment 14 at about -5°C, so as to ensure that the aquatic products are not thawed before arriving at the destination, thereby achieving the purpose of heat preservation and energy saving.

[0035] The heat exchange coil in the primary cooling water eliminator 3 and the heat exchange coil in the secondary cooling water eliminator 5 are connected to the circulation radiator 17 through the corresponding primary heat dissipation pipeline 18 and the secondary heat dissipation pipeline 19. The heat dissipation port of the circulation radiator 17 is connected to the outside and the cab through the three-way pipeline 28. The three-way pipeline 28 can be used to control the direction of the cooling air by switching the valve, so that the temperature in the cab can be raised in the low temperature environment in winter to achieve heat recovery.

[0036] The gas outlet of the gas-liquid separator 10 is connected to the gas inlet of the air compression pump 2 through the circulation pipeline 21, and the unliquefied air is separated in the gas-liquid separator 10 and connected to the gas inlet of the air compression pump 2 for recycling.

[0037] The cold storage module includes a cold storage heat exchanger 9. The heat exchange coil in the cold storage heat exchanger 9 is connected to the expansion end 6 of the expansion compressor 4 through an expansion pipeline. The air outlet end of the cold storage heat exchanger 9 is connected to the gas-liquid separator 10. The compressed and cooled air passes through the expansion end 6 of the expansion compressor 4, and the pressure drops rapidly, expands and absorbs heat, and the temperature drops, so that the temperature in the cold storage heat exchanger 9 drops to the critical point of air liquefaction, and the gas-liquid mixed air enters the gas-liquid separator 10.

[0038] The air purification module includes an adsorber 7 connected to the air outlet end of the secondary cooling dehumidifier 5. The air outlet end of the adsorber 7 is connected to the air inlet end of the cold storage heat exchanger 9 through a high-pressure compressor 8. The adsorber 7 purifies the treated air to remove residual moisture and metal particles and fine oil droplets in the air compression process.

[0039] The insulation pipeline 20 is connected to a first valve 22 .

[0040] A second valve 23 is connected between the air outlet end of the primary cooling water remover 3 and the air inlet end of the expansion compressor 4 .

[0041] The liquid outlet of the primary cooling water remover 3 is connected to a third valve 24 .

[0042] The liquid outlet of the secondary cooling water eliminator 5 is connected to a fourth valve 25 .

[0043] The lower end of the adsorber 7 is connected to a fifth valve 26 .

[0044] A sixth valve 27 is provided between the inlet end of the atomizing injector 13 and the liquid air pump 12 .

[0045] During the quick freezing process of the loading and unloading vehicle, the first valve 22 is closed, and the second valve 23 and the sixth valve 27 are opened. During the heat preservation process of the vehicle, the second and sixth valves 27 are closed, and the first valve 22 is opened, so as to realize the switching between the quick freezing and heat preservation modes.

[0046] The third valve 24, the fourth valve 25 and the fifth valve 26 are drain valves having the function of isolating air and automatically draining water.

[0047] The air inlet end of the air compression pump 2 is connected to an air fine segmentation filter 1 .

[0048] The primary cooling circulation pump 15 is connected to the primary heat dissipation pipeline 18 , and the secondary cooling circulation pump 16 is connected to the secondary heat dissipation pipeline 19 .

[0049] The working principle of this device is: During the loading and unloading stage of the refrigerated truck, the AC 220V mains electricity is connected to the entire quick freezing system, and the air compression pump 2, the expansion compressor 4, the high-pressure compressor 8, the liquid air pump 12, the primary cooling circulation pump 15, and the secondary cooling circulation pump 16 are all in working state. At the same time, the first valve 22 is closed, the second valve 23 and the sixth valve 27 are opened, and the normal pressure air is purified, precooled, expanded and compressed, liquefied, quick frozen, and circulated heat dissipation to complete cold storage and quick freezing; During the driving stage of the refrigerated truck, the vehicle battery is used to power only the air compression pump 2 and the primary cooling circulation pump 15, while the second valve 23 and the sixth valve 27 are closed and the first valve 22 is opened. The air in the compartment 14 is cooled by the air compression pump 2 and the primary circulation, realizing a small circulation operation, and keeping the compartment 14 warm, thereby achieving the purpose of energy saving. The air at normal temperature and pressure passes through the air compression pump 2 and the primary cooling water remover 3, with a pressure of about 2MPa and a temperature dropping to about -18°C. After passing through the secondary expansion compressor 4 and the secondary cooling water remover 5, the pressure is about 8MPa and the temperature drops to about -60°C. After being compressed by the high-pressure compressor 8, the pressure is about 33MPa. The expansion compressor 4 drops the temperature in the cold storage heat exchanger 9 to about 10°C below the critical point of air liquefaction, and the air is partially liquefied in the cold storage heat exchanger 9.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. Refrigerated truck quick freezing system, characterized by: It includes a precooling module, an expansion and compression module, an air purification module, a cold storage module, an air liquefaction module and a release module connected in series in sequence; The precooling module is independently connected to the release module via the heat preservation module; The air liquefaction module comprises a gas-liquid separator (10), wherein a liquid outlet end of the gas-liquid separator (10) is connected to a liquid air storage tank (11). The release module comprises an atomizing injector (13) connected to the interior of the carriage (14); the outlet end of the liquid air storage tank (11) is connected to the inlet end of the atomizing injector (13) via a liquid air pump (12). The precooling module comprises an air compression pump (2), the air compression pump (2) being connected to a primary cooling water remover (3); the expansion compression module comprises an expansion compressor (4), the air outlet end of the expansion compressor (4) being connected to a secondary cooling water remover (5), The air outlet end of the primary cooling water remover (3) is connected to the air inlet end of the expansion compressor (4).

2. The refrigerated vehicle quick freezing system according to claim 1, characterized in that: The heat preservation module comprises a heat preservation pipeline (20) connected to the gas outlet end of the primary cooling water remover (3), and the heat preservation pipeline (20) is connected to the atomizing injector (13).

3. The refrigerated vehicle quick freezing system according to claim 1, characterized in that: The heat exchange coil in the primary cooling water remover (3) and the heat exchange coil in the secondary cooling water remover (5) are connected to a circulating radiator (17) via corresponding primary heat dissipation pipelines (18) and secondary heat dissipation pipelines (19); the heat dissipation port of the circulating radiator (17) is connected to the outside and the cab via a three-way pipeline (28).

4. The refrigerated vehicle quick freezing system according to claim 1, characterized in that: The gas outlet end of the gas-liquid separator (10) is connected to the gas inlet end of the air compression pump (2) via a circulation pipeline (21).

5. The refrigerated vehicle quick freezing system according to claim 1, characterized in that: The cold storage module comprises a cold storage heat exchanger (9), the heat exchange coil in the cold storage heat exchanger (9) being connected to the expansion end (6) of the expansion compressor (4) via an expansion pipeline, and the gas outlet end of the cold storage heat exchanger (9) being connected to the gas-liquid separator (10).

6. The refrigerated vehicle quick freezing system according to claim 5, characterized in that: The air purification module comprises an adsorber (7) connected to the air outlet end of the secondary cooling water remover (5), and the air outlet end of the adsorber (7) is connected to the air inlet end of the cold storage heat exchanger (9) via a high-pressure compressor (8).

7. The refrigerated vehicle quick freezing system according to claim 1, characterized in that: The air inlet end of the air compression pump (2) is connected to an air fine-dividing filter (1).

8. The refrigerated vehicle quick freezing system according to claim 3, characterized in that: The primary heat dissipation pipeline (18) is connected to a primary cooling circulation pump (15), and the secondary heat dissipation pipeline (19) is connected to a secondary cooling circulation pump (16).

9. The refrigerated vehicle quick freezing system according to claim 2, characterized in that: The insulation pipeline (20) is connected to a first valve (22), a second valve (23) is connected between the gas outlet end of the primary cooling water remover (3) and the gas inlet end of the expansion compressor (4), and a third valve (24) is connected to the liquid outlet end of the primary cooling water remover (3).

10. The refrigerated vehicle quick freezing system according to claim 6, characterized in that: The liquid outlet end of the secondary cooling dehydrator (5) is connected to a fourth valve (25), the lower end of the adsorber (7) is connected to a fifth valve (26), and a sixth valve (27) is provided between the inlet end of the atomizing injector (13) and the liquid air pump (12).

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