CN119085195A - Liquid nitrogen freezing and nitrogen filling packaging system and use method - Google Patents
Liquid nitrogen freezing and nitrogen filling packaging system and use method Download PDFInfo
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- CN119085195A CN119085195A CN202411441156.3A CN202411441156A CN119085195A CN 119085195 A CN119085195 A CN 119085195A CN 202411441156 A CN202411441156 A CN 202411441156A CN 119085195 A CN119085195 A CN 119085195A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
- F25D3/11—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air with conveyors carrying articles to be cooled through the cooling space
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D13/00—Stationary devices, e.g. cold-rooms
- F25D13/06—Stationary devices, e.g. cold-rooms with conveyors carrying articles to be cooled through the cooling space
- F25D13/062—Stationary devices, e.g. cold-rooms with conveyors carrying articles to be cooled through the cooling space with refrigerated conveyors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/042—Air treating means within refrigerated spaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/006—General constructional features for mounting refrigerating machinery components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/06—Walls
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
Abstract
一种液氮冻结及充氮包装系统及使用方法，涉及食品的速冻技术领域，用于解决现有液氮冻结设备存在的未能充分利用液氮汽化后的冷量和缺乏对氮气回收再利用的问题。包括带式输送机和速冻箱，所述带式输送机贯穿速冻箱，所述速冻箱内腔的上部具有喷淋装置，所述喷淋装置通过管道与液氮储罐连接，还包括预冷箱、预冷氮气储罐和包装氮气储罐，所述带式输送机贯穿预冷箱，所述预冷箱内具有预冷气嘴，所述预冷气嘴通过管道与预冷氮气储罐连接；所述速冻箱内腔的下部具有均衡气嘴，所述预冷氮气储罐还通过管道与速冻箱连接。本发明在实现对食品速冻的同时，可实现对液氮汽化后冷量的利用。
A liquid nitrogen freezing and nitrogen filling packaging system and a method of use, relating to the technical field of quick freezing of food, is used to solve the problems of existing liquid nitrogen freezing equipment that the cold capacity after liquid nitrogen vaporization is not fully utilized and the nitrogen recovery and reuse is lacking. It includes a belt conveyor and a quick freezing box, the belt conveyor runs through the quick freezing box, the upper part of the inner cavity of the quick freezing box is provided with a spray device, and the spray device is connected to the liquid nitrogen storage tank through a pipeline, and also includes a precooling box, a precooling nitrogen storage tank and a packaging nitrogen storage tank, the belt conveyor runs through the precooling box, the precooling box has a precooling air nozzle, and the precooling air nozzle is connected to the precooling nitrogen storage tank through a pipeline; the lower part of the inner cavity of the quick freezing box has a balancing air nozzle, and the precooling nitrogen storage tank is also connected to the quick freezing box through a pipeline. The present invention can realize the utilization of the cold capacity after liquid nitrogen vaporization while realizing the quick freezing of food.
Description
Technical Field
The invention relates to the technical field of quick freezing of foods, in particular to a liquid nitrogen freezing and nitrogen filling packaging system and a use method thereof.
Background
Quick-freezing is one of the important technologies for preserving fresh foods, can preserve the flavor and nutrition of foods to the greatest extent, and is beneficial to prolonging the storage period. Factors influencing the quality of quick-frozen foods, such as raw material quality, pretreatment process, freezing rate and the like, are more mutually related, and the freezing rate is a decisive factor. The freezing equipment can be divided into slow freezing (O-lcm/h), medium-speed freezing (l-5 cm/h) and quick freezing (5-2 Ocm/h) according to the freezing speed, and the different freezing speeds lead the size, shape and distribution of the ice crystals inside the frozen food to be different, so that the quality of the frozen food is greatly influenced.
The slow freezing rate results in loss of food nutrients, and liquid nitrogen freezing is a good rapid freezing mode for some expensive foods. Liquid nitrogen is a low-temperature liquid with a non-toxic boiling point of-196 ℃. The instant freezing process can be completed in a short time, the freshness of food is maximally reserved, the loss of moisture is reduced, the good taste is maintained, the cell tissues of the food are not damaged, the nutrition loss is not generated, namely the instant fresh-keeping is realized, and the nutritional value is extremely frozen and locked. In addition, the gas generated by the liquid nitrogen freezing technology is inert nitrogen, and the liquid nitrogen isolates air in the vaporization process to protect food. The ultralow temperature quick freezing mode of liquid nitrogen freezing can also play an effective role in disinfection and sterilization, and the concern that the quality of food is damaged due to the propagation of bacteria attached to the food is avoided.
Chinese patent 2015104381948 discloses a jacketed liquid nitrogen spraying refrigerator, wherein the top of the refrigerator body is divided into a jacket layer by a partition plate, a plurality of air outlet holes are formed in the partition plate, a liquid nitrogen spraying device is arranged in the jacket layer, and the liquid nitrogen spraying device is connected with a liquid storage tank through a liquid inlet pipeline. The refrigerator adopts a jacket type spray air supply mode, the temperature field is more uniform, and the arrangement of the partition plate avoids the liquid nitrogen drops from dripping on fruits and vegetables to cause frostbite.
The large-surface quick-freezing room structure comprises a fan, a surrounding conveying belt, a quick-freezing room body and a liquid nitrogen spray pipe, wherein the inner part of the quick-freezing room body is divided into a residual cold collecting cavity and a nitrogen quick-freezing cavity through a heat preservation partition board, the surrounding conveying belt is arranged in the quick-freezing room body, one end of the surrounding conveying belt is arranged on the outer side of the quick-freezing room body, the liquid nitrogen spray pipe is arranged in the nitrogen quick-freezing cavity, a plurality of nozzles are arranged on the liquid nitrogen spray pipe, a plurality of fans are arranged below the surrounding conveying belt, the quick-freezing distance of the surface points is effectively prolonged, the length and the size of the quick-freezing room body are reduced, cold leakage is effectively avoided, a good cooling effect is achieved, and quick-freezing efficiency is improved. According to the quick-freezing room structure, the flour spots are conveyed into the quick-freezing room body through the surrounding conveying belt, and the flour spots are conveyed out of the quick-freezing room body through the surrounding conveying belt after quick freezing is finished.
The two prior arts both propose the purpose of freezing food by spraying liquid nitrogen, however, the liquid nitrogen is vaporized into nitrogen after heat exchange with the food, on one hand, the nitrogen carries a certain amount of cold energy which is not utilized, and on the other hand, the nitrogen is not collected and reused.
Disclosure of Invention
The invention aims to provide a liquid nitrogen freezing and nitrogen filling packaging system and a use method thereof, which are used for solving the problems that the existing liquid nitrogen freezing equipment cannot fully utilize the cold energy after liquid nitrogen vaporization and lacks recycling and reutilizing nitrogen.
The liquid nitrogen freezing and nitrogen filling packaging system comprises a belt conveyor and a quick-freezing box, wherein the belt conveyor penetrates through the quick-freezing box, a spraying device is arranged at the upper part of an inner cavity of the quick-freezing box and is connected with a liquid nitrogen storage tank through a pipeline, the liquid nitrogen freezing and nitrogen filling packaging system further comprises a pre-cooling box, a pre-cooling nitrogen storage tank and a packaging nitrogen storage tank, the belt conveyor penetrates through the pre-cooling box, the pre-cooling box and the quick-freezing box are arranged front and back along the conveying direction of the belt conveyor, pre-cooling air nozzles are arranged in the pre-cooling box, and the pre-cooling air nozzles are connected with the pre-cooling nitrogen storage tank through the pipeline; when the quick-freezing box is operated, liquid nitrogen in the liquid nitrogen storage tank is sprayed on food on the belt conveyor through the spraying device, precooling nitrogen carrying cold after vaporization of the liquid nitrogen flows in the quick-freezing box under the action of the equalization air tap and enters the precooling nitrogen storage tank for storage, precooling nitrogen in the precooling nitrogen storage tank enters the precooling box through the precooling air tap for precooling the food, and the precooling nitrogen and the food in the precooling box enter the packaging nitrogen storage tank after heat exchange.
The belt conveyor sequentially passes through the precooling box inlet, the precooling box outlet, the quick-freezing box inlet and the quick-freezing box outlet, and sealing gaskets contacted with an upper layer conveying belt of the belt conveyor are arranged on the lower edges of the precooling box inlet, the precooling box outlet, the quick-freezing box inlet and the quick-freezing box outlet.
Further, the precooling box inlet and the quick-freezing box outlet are both provided with sealing assemblies, each sealing assembly comprises two rows of symmetrically arranged baffles, one end of each baffle is hinged to the corresponding precooling box side wall and the corresponding quick-freezing box side wall, a pretension piece is arranged between each baffle and the corresponding precooling box and the corresponding quick-freezing box, when the pretension piece is stressed least, the other ends of the two rows of baffles of each sealing assembly are contacted and kept in contact with the two adjacent baffles in the same row, and sealing of the precooling box inlet and the quick-freezing box outlet is achieved.
Further, the pre-cooling box and the quick-freezing box are internally provided with carrier rollers, and the carrier rollers are kept in contact with an upper layer conveying belt of the belt conveyor.
Further, the spraying device comprises an upper nozzle, side nozzles and a lower nozzle, wherein the upper nozzle is positioned above the upper-layer conveying belt, the side nozzles are positioned on two sides of the upper-layer conveying belt, and the lower nozzle is positioned below the upper-layer conveying belt.
Further, the pre-cooling box and the quick-freezing box are arranged in a front-back mode.
Further, the pre-cooling air tap is positioned at one side close to the outlet of the pre-cooling box.
Further, the equalizing air tap is positioned at one side close to the outlet of the quick-freezing box, and the spraying device is positioned at one side close to the inlet of the quick-freezing box.
The invention also provides a use method of the liquid nitrogen freezing and nitrogen filling packaging system, which comprises the following steps:
s1, starting the belt conveyor, placing food to be quick-frozen on the belt conveyor, and conveying the food into a pre-cooling box by the belt conveyor;
s2, conveying the precooling nitrogen in the precooling nitrogen storage tank to a precooling air tap, precooling the food in the precooling box, and enabling the precooled food to enter a quick-freezing box;
S3, conveying the liquid nitrogen in the liquid nitrogen storage tank to a spraying device, and spraying the liquid nitrogen on the food through the spraying device to realize quick freezing;
S4, collecting precooled nitrogen in the quick-freezing box to a precooled nitrogen storage tank for precooling food;
s5, collecting the nitrogen in the pre-cooling box to a packaging nitrogen storage tank for food packaging.
The quick-freezing box has the beneficial effects that liquid nitrogen is sprayed to the food through the spraying device, quick-freezing of the food is further achieved, the air box is arranged in the quick-freezing box in a balanced mode, air flow in the quick-freezing box is enabled to flow, the temperature in the quick-freezing box is balanced, the quick-freezing degree of the food is guaranteed to be consistent, the quick-freezing box is filled with inert nitrogen, effective sterilization and disinfection are achieved at ultralow temperature, precooled nitrogen in the quick-freezing box is collected, the food is precooled by the precooled nitrogen before the food is quick-frozen, so that consumption of the liquid nitrogen is reduced, and nitrogen in the precooling box is collected for inflatable packaging of the food. According to the quick freezing method, liquid nitrogen is utilized to quick freeze the food, the temperature of the quick freezing box is balanced after the liquid nitrogen is vaporized to ensure the consistency of quick freezing degree, the liquid nitrogen is utilized to pre-cool the food after the liquid nitrogen is vaporized, and nitrogen is collected for packaging the food after pre-cooling contact, so that the whole process is connected before and after.
Drawings
FIG. 1 is a system block diagram of the present invention;
Fig. 2 is a front view assembly of the belt conveyor, pre-chill box and quick-chill box;
FIG. 3 is a cross-sectional assembly view of the pre-chill box and the quick-chill box;
Fig. 4 is an internal structure diagram of the quick-freezing box;
FIG. 5 is an internal structural view of the pre-cooling tank;
fig. 6 is a right side view of the quick-freeze box;
FIG. 7 is an enlarged view of a portion of FIG. 4 at A;
FIG. 8 is a side view of the spray device spraying food products;
FIG. 9 is a schematic diagram of the flow of air in the quick-freeze box;
FIG. 10 is a schematic diagram of the flow of air within a pre-cooling tank;
FIG. 11 is a schematic diagram of the food transport, liquid nitrogen flow, and nitrogen flow of the present invention;
In the figure, a belt conveyor 1, a conveyor belt 11, a precooling box 2, a precooling box inlet 21, a precooling box outlet 22, a baffle 23, a carrier roller 24, a sealing gasket 25, a precooling air tap 26, a packaging nitrogen outlet 27, a quick-freezing box 3, a quick-freezing box inlet 31, a quick-freezing box outlet 32, an upper nozzle 33, a side nozzle 34, a lower nozzle 35, a balancing air tap 36, a precooling nitrogen outlet 37, a liquid nitrogen storage tank 4, a precooling nitrogen storage tank 5, a packaging nitrogen storage tank 6 and food 7.
Detailed Description
As shown in fig. 1 to 11, the liquid nitrogen freezing and nitrogen filling packaging system of the present invention comprises a belt conveyor 1, a pre-cooling tank 2, a quick-freezing tank 3, a liquid nitrogen storage tank 4, a pre-cooling nitrogen storage tank 5 and a packaging nitrogen storage tank 6, and the structure, the working principle and the using method of the present invention are described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 11, the liquid nitrogen freezing and nitrogen filling packaging system comprises a belt conveyor 1 and a quick freezing box 3, wherein as shown in fig. 1 and 2, the belt conveyor 1 penetrates through the quick freezing box 3, a spraying device is arranged at the upper part of the inner cavity of the quick freezing box 3, and the spraying device is connected with a liquid nitrogen storage tank 4 through a pipeline. The belt conveyor 1 is used for conveying foods to be frozen into the quick freezing box 3, a pump is arranged on a pipeline between the liquid nitrogen storage tank 4 and the spraying device, liquid nitrogen in the liquid nitrogen storage tank 4 is conveyed to the spraying device through the pump, and the liquid nitrogen is sprayed on the foods in an atomized or water-drop mode through the spraying device, so that quick freezing of the foods is realized.
As an innovation point of the invention, the invention is also provided with a pre-cooling box 2, a pre-cooling nitrogen storage tank 5 and a packaging nitrogen storage tank 6, and the belt conveyor 1 also penetrates through the pre-cooling box 2. Along the conveying direction of the belt conveyor 1, the pre-cooling box 2 and the quick-freezing box 3 are arranged back and forth. That is, the food on the belt conveyor 1 first enters the pre-cooling box 2 and then enters the quick-freezing box 3. The food is pre-cooled in the pre-cooling tank 2, and for this purpose, as shown in fig. 3 and 5, a pre-cooling air tap 26 is provided in the pre-cooling tank 2, the air outlet of the pre-cooling air tap 26 faces the belt conveyor 1, and the pre-cooling air tap 26 is connected with the pre-cooling nitrogen storage tank 5 through a pipeline. To avoid a large flow of pre-chilled nitrogen out of pre-chill tank 2, pre-chill nozzle 26 is positioned on a side near pre-chill tank outlet 22, as shown in fig. 5, and the side wall of pre-chill tank 2 has a packing nitrogen outlet 27, with packing nitrogen outlet 27 positioned on a side near pre-chill tank inlet 21. The precooling nitrogen storage tank 5 is also connected with the quick-freezing box 3 through a pipeline, and the packaging nitrogen storage tank 6 is connected with the precooling box 2 through a pipeline. Nitrogen in the pre-cooler 2 enters the pipeline through a packed nitrogen outlet 27 and finally enters the packed nitrogen storage tank 6. As shown in fig. 10, pre-cooling nitrogen in the pre-cooling nitrogen storage tank 5 enters the pre-cooling tank 2 through the pre-cooling nozzle 26 and is directly blown on food, so that the food is pre-cooled, and the nitrogen flow in the pre-cooling tank 2 circularly flows. The nitrogen in pre-cooler 2 is removed from pre-cooler 2 via package nitrogen outlet 27 as it circulates to the location of pre-cooler inlet 21.
In order to realize the equalization of the temperature in the quick-freezing box 3, as shown in fig. 3 and 4, the lower part of the inner cavity of the quick-freezing box 3 is provided with an equalization air tap 36, the equalization air tap 36 is connected with a fan positioned outside the quick-freezing box 3, the air inlet of the fan is communicated with the inner cavity of the quick-freezing box 3, and the air outlet of the equalization air tap 36 faces the belt conveyor 1. After the blower is started, the precooled nitrogen in the quick-freezing box 3 enters an equalization air tap 36, as shown in fig. 9, and is sprayed back into the quick-freezing box 3 through the equalization air tap 36, so that the circulation of the precooled nitrogen in the quick-freezing box 3 is realized, and the temperature in the quick-freezing box 3 gradually tends to be equalized through continuous air circulation.
In operation, as shown in fig. 11, the belt conveyor 1 conveys the food products so that the food products sequentially enter the pre-cooling box 2 and the quick-freezing box 3. The liquid nitrogen in the liquid nitrogen storage tank 4 is sprayed on the food on the belt conveyor 1 through a spraying device, and precooled nitrogen carrying cold after the liquid nitrogen is gasified flows in the quick freezing box 3 under the action of the equalization air tap 36 and enters the precooling nitrogen storage tank 5 for storage so as to be used for precooling the food. The precooling nitrogen in the precooling nitrogen storage tank 5 enters the precooling box 2 through the precooling air tap 26 to precool the food, and enters the packaging nitrogen storage tank 5 after heat exchange between the precooling nitrogen and the food in the precooling box 2 so as to be used for inflating and packaging the food.
The following describes the structure of the pre-cooling box 2 and the quick-freezing box 3, wherein, as shown in fig. 5, one side wall of the pre-cooling box 2 is provided with a pre-cooling box inlet 21, and the other side wall opposite to the pre-cooling box 2 is provided with a pre-cooling box outlet 22. As shown in fig. 4, one side wall of the quick-freezing box 3 is provided with a quick-freezing box inlet 31, and the other opposite side wall of the quick-freezing box 3 is provided with a quick-freezing box outlet 32. The belt conveyor 1 sequentially passes through the pre-cooling box inlet 21, the pre-cooling box outlet 22, the quick-freezing box inlet 31 and the quick-freezing box outlet 32, and the upper layer conveying belt 11 of the belt conveyor 1 penetrates through the pre-cooling box 2 and the quick-freezing box 3, and the lower layer conveying belt 11 of the belt conveyor 1 is positioned outside the pre-cooling box 2 and the quick-freezing box 3 and below the pre-cooling box 2 and the quick-freezing box 3. The pre-cooling box inlet 21, the pre-cooling box outlet 22, the quick-freezing box inlet 31 and the quick-freezing box outlet 32 are located at the same height, and as shown in fig. 7, the lower edges of the pre-cooling box inlet 21, the pre-cooling box outlet 22, the quick-freezing box inlet 31 and the quick-freezing box outlet 32 are provided with sealing gaskets 25 which are in contact with the upper conveying belt 11 of the belt conveyor 1. The surface of the gasket 25 is smooth, and the friction against the conveyor belt 11 is small. The side wall of the quick-freezing box 3 is provided with a precooling nitrogen outlet 37, and the precooling nitrogen outlet 37 is connected with the precooling nitrogen storage tank 5 through a pipeline.
In order to seal the pre-cooling box inlet 21 and the quick-freezing box outlet 32 to reduce the loss of nitrogen and cold in the pre-cooling box 2 and the loss of pre-cooling nitrogen and cold in the quick-freezing box 3, as shown in fig. 3, the pre-cooling box inlet 21 and the quick-freezing box outlet 32 are provided with sealing assemblies, as shown in fig. 6, each of which comprises two rows of symmetrically arranged baffles 23. On the pre-cooling box 2, one end of a baffle plate 23 is hinged with the side wall of the pre-cooling box 2, and a pre-tightening piece is arranged between the baffle plate 23 and the pre-cooling box 2. On the quick-freezing box 3, one end of a baffle plate 23 is hinged with the side wall of the quick-freezing box 3, and a pre-tightening piece is arranged between the baffle plate 23 and the quick-freezing box 3. When the pre-tightening piece is stressed least, the other ends of the two rows of baffles 23 of the sealing assembly are contacted with each other and keep contact with the adjacent two baffles 23 in the row, so that the pre-cooling box inlet 21 and the quick-freezing box outlet 32 are sealed. In the process that the belt conveyor 1 drives food to enter the pre-cooling box 2, after the food contacts with the baffle plate 23 of the pre-cooling box inlet 21, the food presses the baffle plate 23 to enable the baffle plate 23 to swing around a hinge point until the food enters the pre-cooling box 2 and is separated from the baffle plate 23, the pre-tightening piece is restored, and the baffle plate 23 is reset under the action of the pre-tightening piece to realize re-blocking/sealing of the pre-cooling box inlet 21. In the process that the belt conveyor 1 drives the food to move out of the quick-freezing box 3, after the food contacts with the baffle plate 23 of the quick-freezing box outlet 32, the food presses the baffle plate 23 to enable the baffle plate 23 to swing around a hinge point until the food moves out of the quick-freezing box 3 and is separated from the baffle plate 23, the pre-tightening piece is restored, and the baffle plate 23 is reset under the action of the pre-tightening piece to realize re-plugging/sealing of the quick-freezing box outlet 32.
For lifting the food, as shown in fig. 3, the pre-cooling box 2 and the quick-freezing box 3 are provided with carrier rollers 24, and the carrier rollers 24 are kept in contact with the upper conveyor belt 11 of the belt conveyor 1.
In order to improve the quick-freezing efficiency, as shown in fig. 8, the spraying device includes an upper nozzle 33, a side nozzle 34, and a lower nozzle 35, the upper nozzle 33 is located above the upper conveyor 11, the side nozzle 34 is located at both sides of the upper conveyor 11, and the lower nozzle 35 is located below the upper conveyor 11. The upper nozzle 33 sprays the food from above, the side nozzle 34 sprays the food from side to side, and the lower nozzle 35 sprays the food from below, by spraying the food from different directions, to ensure quick freezing efficiency.
In order to reduce the loss of cold energy, the pre-cooling box 2 and the quick-freezing box 3 are arranged next to each other so as to avoid the direct heat exchange between the cold energy in the quick-freezing box 3 and the air. At this time, the cooling capacity in the quick-freezing box 3 is heat-exchanged with the pre-cooling box 2 to ensure the pre-cooling effect of the foods in the pre-cooling box 2.
After the quick-freezing of the food, the temperature of the food should be equalized, and as shown in fig. 4, the equalizing air tap 36 is located at a side near the outlet 32 of the quick-freezing box, and the spraying device is located at a side near the inlet 31 of the quick-freezing box. The spraying device is close to the inlet 31 of the quick-freezing box, so that part of pre-cooling nitrogen after liquid nitrogen vaporization can directly enter the pre-cooling box 2 through the inlet 31 of the quick-freezing box and the outlet 22 of the pre-cooling box. The equalization air tap 36 is positioned on the side of the freezer outlet 32 to ensure consistent quick freezing of the food product moving out of the freezer outlet 32.
The invention relates to a use method of a liquid nitrogen freezing and nitrogen filling packaging system, which comprises the following steps:
S1, starting a belt conveyor 1, placing food 7 to be quick-frozen on the belt conveyor 1, and conveying the food 7 into a pre-cooling box 2 by the belt conveyor 1;
s2, conveying pre-cooling nitrogen in the pre-cooling nitrogen storage tank 5 to the pre-cooling air tap 26, pre-cooling the food in the pre-cooling box 2, and enabling the pre-cooled food to enter the quick-freezing box 3;
S3, conveying the liquid nitrogen in the liquid nitrogen storage tank 4 to a spraying device, spraying the liquid nitrogen on the food 7 through the spraying device to realize quick freezing, and starting a fan to enable air flow in the quick freezing box 3 to circulate so as to enable the temperature in the quick freezing box 3 to be balanced;
s4, collecting precooled nitrogen in the quick-freezing box 3 to a precooled nitrogen storage tank 5 for precooling food;
s5, collecting the nitrogen in the precooling box 2 to a packaging nitrogen storage tank 6 for food packaging.
The quick-freezing box is characterized in that liquid nitrogen is sprayed to foods through a spraying device to further realize quick freezing of the foods, an air box 36 is arranged in the quick-freezing box 3 to enable air flow in the quick-freezing box 3 to flow, so that temperature in the quick-freezing box 3 is balanced, further, the consistency of quick-freezing degree of the foods is ensured, the quick-freezing box 3 is filled with inert nitrogen to realize effective sterilization at ultralow temperature, precooled nitrogen in the quick-freezing box 3 is collected, the foods are precooled by the precooled nitrogen before the foods are quick-frozen to reduce consumption of the liquid nitrogen, and nitrogen in the precooling box 2 is collected for aerated packaging of the foods. According to the quick freezing method, liquid nitrogen is utilized to quick freeze the food, the liquid nitrogen is gasified and then used for balancing the temperature of the quick freezing box 3 to ensure the consistency of quick freezing degree, the liquid nitrogen is gasified and then used for precooling the food, and the nitrogen is collected after precooling contact and used for packaging the food, so that the whole process is connected before and after.
Claims (9)
1. The liquid nitrogen freezing and nitrogen charging packaging system comprises a belt conveyor and a quick-freezing box, wherein the belt conveyor penetrates through the quick-freezing box, a spraying device is arranged at the upper part of an inner cavity of the quick-freezing box and is connected with a liquid nitrogen storage tank through a pipeline; when the quick-freezing box is operated, liquid nitrogen in the liquid nitrogen storage tank is sprayed on food on the belt conveyor through the spraying device, the liquid nitrogen is vaporized and becomes precooling nitrogen carrying cold, the precooling nitrogen circularly flows in the quick-freezing box under the action of the equalization air tap and enters the precooling nitrogen storage tank for storage, precooling nitrogen in the precooling nitrogen storage tank enters the precooling box for precooling the food through the precooling air tap, and the precooling nitrogen and the food in the precooling box enter the packaging nitrogen storage tank after heat exchange.
2. The liquid nitrogen freezing and nitrogen charging packaging system according to claim 1, wherein a precooling box inlet is formed in one side wall of the precooling box, a precooling box outlet is formed in the other side wall opposite to the precooling box, a quick-freezing box inlet is formed in one side wall of the quick-freezing box, a quick-freezing box outlet is formed in the other side wall opposite to the quick-freezing box, the belt conveyor sequentially penetrates through the precooling box inlet, the precooling box outlet, the quick-freezing box inlet and the quick-freezing box outlet, and sealing gaskets are arranged on the lower edges of the precooling box inlet, the precooling box outlet, the quick-freezing box inlet and the quick-freezing box outlet and are in contact with an upper conveying belt of the belt conveyor.
3. The liquid nitrogen freezing and nitrogen charging packaging system according to claim 2, wherein the pre-cooling box inlet and the quick-freezing box outlet are both provided with sealing assemblies, the sealing assemblies comprise two rows of baffles symmetrically arranged, one ends of the baffles are hinged with the corresponding pre-cooling box side wall and the corresponding quick-freezing box side wall, a pre-tightening piece is arranged between the baffles and the corresponding pre-cooling box and the quick-freezing box, and when the pre-tightening piece is stressed at minimum, the other ends of the two rows of baffles of the sealing assemblies are contacted and kept in contact with the two adjacent baffles in the same row, so that the sealing of the pre-cooling box inlet and the quick-freezing box outlet is realized.
4. A liquid nitrogen freezing and nitrogen-filled packaging system as recited in claim 1 wherein said pre-chill box and said flash chill box have carrier rollers therein which are held in contact with the upper conveyor belt of the belt conveyor.
5. The liquid nitrogen freezing and nitrogen-filled packaging system of claim 1, wherein the spraying device comprises an upper nozzle, a side nozzle and a lower nozzle, wherein the upper nozzle is positioned above the upper conveyor belt, the side nozzle is positioned on two sides of the upper conveyor belt, and the lower nozzle is positioned below the upper conveyor belt.
6. The liquid nitrogen freezing and nitrogen-filled packaging system of claim 1, wherein the pre-chill tank and the flash tank are positioned immediately in tandem.
7. The liquid nitrogen freezing and nitrogen-filled packaging system of claim 1, wherein said pre-chill air tap is positioned on a side adjacent to an outlet of the pre-chill tank.
8. The liquid nitrogen freezing and nitrogen-filled packaging system of claim 7, wherein said equalization air tap is positioned on a side adjacent to an outlet of the flash tank and said spray device is positioned on a side adjacent to an inlet of the flash tank.
9. A method of using a liquid nitrogen freezing and nitrogen filled packaging system according to any one of claims 1 to 8, comprising the steps of:
s1, starting the belt conveyor, placing food to be quick-frozen on the belt conveyor, and conveying the food into a pre-cooling box by the belt conveyor;
s2, conveying the precooling nitrogen in the precooling nitrogen storage tank to a precooling air tap, precooling the food in the precooling box, and enabling the precooled food to enter a quick-freezing box;
S3, conveying the liquid nitrogen in the liquid nitrogen storage tank to a spraying device, and spraying the liquid nitrogen on the food through the spraying device to realize quick freezing;
S4, collecting precooled nitrogen in the quick-freezing box to a precooled nitrogen storage tank for precooling food;
s5, collecting the nitrogen in the pre-cooling box to a packaging nitrogen storage tank for food packaging.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411441156.3A CN119085195A (en) | 2024-10-16 | 2024-10-16 | Liquid nitrogen freezing and nitrogen filling packaging system and use method |
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| CN202411441156.3A CN119085195A (en) | 2024-10-16 | 2024-10-16 | Liquid nitrogen freezing and nitrogen filling packaging system and use method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120212685A (en) * | 2025-05-26 | 2025-06-27 | 福建立兴食品股份有限公司 | A freeze-dried wonton quick-freezing device regulated by gradient ice crystals |
| CN120926658A (en) * | 2025-10-09 | 2025-11-11 | 福建海文铭海洋科技发展有限公司 | Quick refrigerating device for abalone production and processing |
-
2024
- 2024-10-16 CN CN202411441156.3A patent/CN119085195A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120212685A (en) * | 2025-05-26 | 2025-06-27 | 福建立兴食品股份有限公司 | A freeze-dried wonton quick-freezing device regulated by gradient ice crystals |
| CN120212685B (en) * | 2025-05-26 | 2025-08-15 | 福建立兴食品股份有限公司 | Freeze-drying endocytosis quick-freezing equipment regulated by gradient ice crystals |
| CN120926658A (en) * | 2025-10-09 | 2025-11-11 | 福建海文铭海洋科技发展有限公司 | Quick refrigerating device for abalone production and processing |
| CN120926658B (en) * | 2025-10-09 | 2026-02-06 | 福建海文铭海洋科技发展有限公司 | A rapid freezing device for abalone production and processing |
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Application publication date: 20241206 |