Refrigerated Vehicle Quick Freezing System

Abstract

The refrigerated vehicle rapid freezing system relates to the technical field of refrigeration systems and includes a pre-cooling module, an expansion compression module, an air purification module, a cold storage module, an air liquefaction module, and a release module that are connected in series in sequence; the pre-cooling module is also independently connected to the release module through a heat preservation module; the air liquefaction module includes a gas-liquid separator, the liquid outlet end of the gas-liquid separator is connected to a liquid air storage tank, the release module includes an atomizing injector connected to the interior of the carriage, and the outlet end of the liquid air storage tank is connected to the inlet end of the atomizing injector through a liquid air pump. The present invention solves the problem that in the traditional technology, refrigerated vehicles use on-vehicle refrigeration units for temperature reduction and freshness preservation, and it is impossible to achieve on-site rapid freezing of seafood, so that the refrigerated vehicle still needs to be driven to a rapid freezing workshop and rely on external rapid freezing equipment, which affects the transportation efficiency of seafood.

Description

Technical Field

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

[0002] Quick freezing is a preservation technology developed in recent years. Through a special low-temperature method, the temperature of seafood is rapidly reduced. Since the temperature drops quickly, the water in the seafood cells does not have time to freeze, causing the food ingredients to quickly form tiny ice crystals, avoiding the formation of large ice crystals between cells and reducing the exosmosis of water inside the cells. Therefore, the muscle structure of the seafood is not damaged. After thawing, the product has less juice loss and good taste, ensuring that the flavor does not leak and maintaining the original nutritional components of the food ingredients. Its quality and taste are retained to the greatest extent. This is currently one of the best preservation methods.

[0003] For seafood distribution, refrigerated trucks are needed, and refrigeration units need to be equipped on the refrigerated trucks to achieve low-temperature preservation of seafood. Since quick-freezing preservation is currently one of the best preservation methods, a refrigeration unit with a quick-freezing function is a development trend.

[0004] Commonly used methods for quick-freezing seafood mainly include:

[0005] Liquid carbon dioxide spray quick-freezing: Spraying liquid carbon dioxide onto the seafood, instantly reducing the temperature to below -78.5°C, and quickly freezing the central temperature of the frozen object from room temperature through the maximum ice crystal formation zone.

[0006] Liquid nitrogen quick-freezing method: Using the extremely low temperature of liquid nitrogen (-196°C), putting the seafood into a sealed plastic bag, exhausting the air and compressing the bag as much as possible, then putting the bag into a liquid nitrogen tank and waiting for a period of time until the seafood is completely frozen.

[0007] A patent with the publication number CN112856867A is disclosed in the prior art. The refrigeration unit for a refrigerated truck includes a condenser assembly, an evaporator assembly, and a compressor. Among them, the condenser assembly is installed in front of the refrigerated compartment outside the vehicle. The condenser assembly includes a condenser at least partially disposed above the roof of the cab. The outlet of the compressor is communicated with the inlet of the condenser. When installing this refrigeration unit for a refrigerated truck, it is not necessary to cut the roof of the cab or reduce the volume of the refrigerated compartment.

[0008] The prior art including the above patent gradually exposes deficiencies during use, mainly manifested in the following aspects:

[0009] First, the existing refrigerated trucks use on-vehicle refrigeration units for temperature reduction and preservation, and cannot achieve on-site quick-freezing of seafood. Therefore, it is necessary to drive the refrigerated truck to a quick-freezing workshop and rely on external quick-freezing equipment, which affects the transportation efficiency of seafood.

[0010] Second, existing quick-freezing methods are all liquid carbon dioxide spray quick-freezing or liquid nitrogen quick-freezing methods. The existing quick-freezing media not only have high production costs, but also have a high operation risk coefficient, posing a large potential safety hazard during the quick-freezing process of seafood.

[0011] Third, existing new energy refrigerated trucks are driven by batteries to power the refrigeration units, seriously affecting the vehicle's cruising range and requiring frequent charging, which affects the transportation efficiency of seafood.

[0012] In summary, it is obvious that there are inconveniences and defects in the existing technology during actual use, so it is necessary to improve it. Summary of the Invention

[0013] In view of the defects in the existing technology, the present invention provides a refrigerated truck quick-freezing system to solve the problem that in the traditional technology, the refrigerated truck uses an on-vehicle refrigeration unit for cooling and preservation, and cannot achieve on-site quick-freezing of seafood, which requires the refrigerated truck to be driven to a quick-freezing workshop and rely on external quick-freezing equipment, affecting the transportation efficiency of seafood.

[0014] To achieve the above object, the present invention provides the following technical solutions:

[0015] A refrigerated truck quick-freezing system includes 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;

[0016] The pre-cooling module is also independently connected to the release module through a heat preservation module;

[0017] The air liquefaction module includes a gas-liquid separator, and the liquid outlet end of the gas-liquid separator is connected to a liquid air storage tank.

[0018] The release module includes an atomizing injector connected to the interior of the carriage, and the outlet end of the liquid air storage tank is connected to the inlet end of the atomizing injector through a liquid air pump.

[0019] As an optimized solution, the pre-cooling module includes an air compression pump, and the air compression pump is connected to a primary cooling and water removal device; the expansion compression module includes an expansion compressor, and the air outlet end of the expansion compressor is connected to a secondary cooling and water removal device.

[0020] As an optimized solution, the air outlet end of the primary cooling and water removal device is connected to the air inlet end of the expansion compressor.

[0021] As an optimized solution, the heat preservation module includes a heat preservation pipeline connected to the air outlet end of the primary cooling and water removal device, and the heat preservation pipeline is connected to the atomizing injector.

[0022] As an optimized solution, the heat exchange coils in the primary cooling and water removal device and the heat exchange coils in the secondary cooling and water removal device are jointly connected to a circulating radiator through corresponding primary heat dissipation pipelines and secondary heat dissipation pipelines, and the heat dissipation port of the circulating radiator is communicated with the outside and the cab through a three-way pipeline.

[0023] As an optimized solution, the gas outlet end of the gas-liquid separator is connected to the gas inlet end of the air compressor pump through a circulating pipeline.

[0024] As an optimized solution, the cold storage module includes a cold storage heat exchanger, the heat exchange coils in the cold storage heat exchanger are 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.

[0025] As an optimized solution, the air purification module includes an adsorber connected to the gas outlet end of the secondary cooling and water removal device, and the gas outlet end of the adsorber is connected to the gas inlet end of the cold storage heat exchanger through a high-pressure compressor.

[0026] As an optimized solution, a first valve is connected to the heat preservation pipeline.

[0027] As an optimized solution, a second valve is connected between the gas outlet end of the primary cooling and water removal device and the gas inlet end of the expansion compressor.

[0028] As an optimized solution, a third valve is connected to the liquid outlet end of the primary cooling and water removal device.

[0029] As an optimized solution, a fourth valve is connected to the liquid outlet end of the secondary cooling and water removal device.

[0030] As an optimized solution, a fifth valve is connected to the lower end of the adsorber.

[0031] As an optimized solution, a sixth valve is provided between the inlet end of the atomizing injector and the liquid oxygen pump.

[0032] As an optimized solution, an air fine filter is connected to the gas inlet end of the air compressor pump.

[0033] As an optimized solution, a primary cooling circulation pump is connected to the primary heat dissipation pipeline, and a secondary cooling circulation pump is connected to the secondary heat dissipation pipeline.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] By setting a pre-cooling module, an expansion compression module, an air purification module, a cold storage module, an air liquefaction module, and a release module in the carriage, the carriage can be equipped with a quick-freezing function, enabling on-site quick-freezing of seafood products without having to drive the vehicle to a quick-freezing workshop. This not only ensures the loading and unloading efficiency of seafood products but also guarantees the transportation timeliness of seafood products;

[0036] Before the refrigerated truck travels, it stores cold with commercial power, quickly freezes seafood products by connecting to commercial power, and reduces the power consumption of the new energy vehicle's battery;

[0037] During the vehicle's driving process, only heat preservation is required. Since most power-consuming components are turned off, the power consumption is low, which can effectively increase the cruising range of the refrigerated truck and save vehicle energy;

[0038] Using conventional air compression as the quick-freezing medium, it quickly freezes seafood products in a low-cost way, ensuring the flavor and taste, and has a lower risk factor compared to liquid carbon dioxide and liquid nitrogen;

[0039] Using air as the refrigerant, it can use commercial power during the loading and unloading of seafood products to prepare liquid compressed air for cold storage and quick-freezing, and use the vehicle-mounted battery to drive the refrigeration unit for heat preservation during the transportation of the refrigerated truck. Combining functions such as cold storage, quick-freezing, and heat preservation, it makes full use of different working time periods of the refrigerated truck and has the characteristics of high efficiency and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or 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 do not necessarily draw according to the actual scale.

[0041] Figure 1 It is a schematic structural diagram of the present invention.

[0042] In the figure: 1, air sub-filter; 2, air compressor pump; 3, primary cooling and water removal device; 4, expansion compressor; 5, secondary cooling and water removal device; 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 injector; 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, heat preservation 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 OF THE EMBODIMENTS

[0043] The embodiments of the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0044] As Figure 1 shown, the refrigerated vehicle rapid freezing system includes 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;

[0045] The pre-cooling module is also independently connected to the release module through a heat preservation module;

[0046] The air liquefaction module includes a gas-liquid separator 10, and the liquid outlet end of the gas-liquid separator 10 is connected to a liquid air storage tank 11.

[0047] The release module includes an atomizing injector 13 connected to the inside of the carriage 14, and the outlet end of the liquid air storage tank 11 is connected to the inlet end of the atomizing injector 13 through a liquid air pump 12.

[0048] The pre-cooling module includes an air compression pump 2, and the air compression pump 2 is connected to a primary cooling and water removal device 3; the expansion compression module includes an expansion compressor 4, and the air outlet end of the expansion compressor 4 is connected to a secondary cooling and water removal device 5.

[0049] The air outlet end of the primary cooling and water removal device 3 is connected to the air inlet end of the expansion compressor 4.

[0050] The heat preservation module includes a heat preservation pipeline 20 connected to the air outlet end of the primary cooling and water removal device 3, and the heat preservation pipeline 20 is connected to the atomizing injector 13.

[0051] During the driving of the refrigerated vehicle, only the pre-cooling module is turned on to keep the temperature of the carriage 14 at about -5°C, ensuring that the aquatic products do not thaw before reaching the destination, and achieving the purpose of heat preservation and energy conservation.

[0052] The heat exchange coils in the primary cooling and water removal device 3 and the heat exchange coils in the secondary cooling and water removal device 5 are jointly connected to a circulating radiator 17 through corresponding primary heat dissipation pipelines 18 and secondary heat dissipation pipelines 19, and the heat dissipation port of the circulating radiator 17 is connected to the outside and the cab through a three-way pipeline 28;

[0053] By using the three-way pipeline 28, the direction of the heat dissipation air can be controlled by switching the valve, and it can be realized to heat up the cab in a relatively low-temperature environment in winter, achieving heat recovery.

[0054] The air outlet end of the gas-liquid separator 10 is connected to the air inlet end of the air compression pump 2 through a circulating pipeline 21, and the unliquefied air is separated in the gas-liquid separator 10 and connected to the air inlet end of the air compression pump 2 for recycling.

[0055] 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 a gas-liquid separator 10. After being compressed and cooled, the air passes through the expansion end 6 of the expansion compressor 4, and its pressure drops rapidly. During the expansion process, heat is absorbed and the temperature decreases, causing the temperature in the cold storage heat exchanger 9 to drop to the air liquefaction critical point. The air in a gas-liquid mixture then enters the gas-liquid separator 10.

[0056] The air purification module includes an adsorber 7 connected to the air outlet end of the secondary cooling and water removal device 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 processed air, removing residual moisture, metal particles, and fine oil droplets during the air compression process.

[0057] A first valve 22 is connected to the heat preservation pipeline 20.

[0058] A second valve 23 is connected between the air outlet end of the primary cooling and water removal device 3 and the air inlet end of the expansion compressor 4.

[0059] A third valve 24 is connected to the liquid outlet end of the primary cooling and water removal device 3.

[0060] A fourth valve 25 is connected to the liquid outlet end of the secondary cooling and water removal device 5.

[0061] A fifth valve 26 is connected to the lower end of the adsorber 7.

[0062] A sixth valve 27 is provided between the inlet end of the atomizing injector 13 and the liquid air pump 12.

[0063] During the quick-freezing process of loading and unloading the vehicle, the first valve 22 is closed, and the second valve 23 and the sixth valve 27 are opened. During the heat preservation process when the vehicle is moving, the second and sixth valves 27 are closed, and the first valve 22 is opened, realizing the switching between the two modes of quick-freezing and heat preservation.

[0064] The third valve 24, the fourth valve 25, and the fifth valve 26 are trap valves, having the function of automatically draining water while isolating air.

[0065] An air fine filter 1 is connected to the air inlet end of the air compression pump 2.

[0066] A primary cooling circulation pump 15 is connected to the primary heat dissipation pipeline 18, and a secondary cooling circulation pump 16 is connected to the secondary heat dissipation pipeline 19.

[0067] The working principle of this device is as follows:

[0068] During the loading and unloading stage of the refrigerated truck, connect to the AC 220V mains power supply, and use the mains power to supply power to the entire quick-freezing system. The air compression pump 2, expansion compressor 4, high-pressure compressor 8, liquid air pump 12, primary cooling circulation pump 15, and 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 completes cold storage and quick-freezing through processes such as purification, pre-cooling, expansion compression, liquefaction, quick-freezing, and circulating heat dissipation;

[0069] During the driving stage of the refrigerated truck, it is powered by the vehicle-mounted battery. Only the air compression pump 2 and the primary cooling circulation pump 15 are turned on. At the same time, the second valve 23 and the sixth valve 27 are closed, and the first valve 22 is opened. The air in the carriage 14 undergoes primary cycle heat dissipation through the air compression pump 2, realizing small-cycle operation, performing the heat preservation function on the carriage 14, and achieving the purpose of energy conservation;

[0070] Among them, the normal-temperature and normal-pressure air passes through the air compression pump 2 and the primary cooling water remover 3, with the pressure around 2MPa and the temperature dropping to around -18°C. After passing through the secondary expansion compressor 4 and the secondary cooling water remover 5, the pressure is around 8MPa and the temperature drops to around -60°C. After being compressed by the high-pressure compressor 8, the pressure is around 33MPa. The expansion compressor 4 reduces the temperature in the cold storage heat exchanger 9 to about 10°C below the air liquefaction critical point, and part of the air is liquefied in the cold storage heat exchanger 9.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description 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 which are 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). 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). 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).

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 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).

4. The refrigerated vehicle quick freezing system according to claim 1, 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).

5. 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).

6. The refrigerated vehicle quick freezing system according to claim 1, 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).

7. 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).

8. The refrigerated vehicle quick freezing system according to claim 4, 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).

Images