Multi-section liquid nitrogen quick-freezing device for abalones

Abstract

The invention relates to the technical field of refrigeration, and discloses a multi-section liquid nitrogen quick-freezing device for abalones, which comprises a quick-freezing device shell and a vibration conveying belt, the vibration conveying belt is arranged at the top of the quick-freezing device shell, a refrigeration assembly is arranged at the top of the quick-freezing device shell, the refrigeration assembly comprises a positioning plate, the positioning plate is clamped at the top of the quick-freezing device shell, and the vibration conveying belt is arranged at the top of the quick-freezing device shell. An air pump is installed in the positioning plate, air inlet holes are jointly formed in the positioning plate and the quick-freezing device shell, and a refrigeration pipe is arranged in the positioning plate; the pre-cooling treatment on the abalones is realized through the vortex tube refrigeration structure, and the vibration conveying belt and the uniform air distribution structure are matched, so that the abalones can be in full contact with cold air flow in the conveying process, the pre-cooling uniformity is improved, and the quality of quick-frozen finished products is improved. The device adopts a Tesla valve spray pipe to increase the flow speed of cold air flow, so that the precooling efficiency is higher, and meanwhile, a water pipe is arranged in a cold air distribution pipe to further enhance the heat exchange effect, so that the cooling capacity is utilized more sufficiently.

Description

Technical Field

[0001] This invention relates to the field of refrigeration, specifically to a multi-stage liquid nitrogen quick-freezing device for abalone. Background Technology

[0002] The multi-stage liquid nitrogen quick-freezing device for abalone is a special equipment used for the rapid freezing of abalone. Through segmented gradient cooling, using liquid nitrogen as a refrigerant, the abalone is frozen thoroughly and properly in a short time, preserving its fresh taste, appearance and quality to the greatest extent.

[0003] Existing multi-stage liquid nitrogen quick-freezing equipment for abalone on the market has significant shortcomings in pre-cooling effect, cold energy utilization, hygiene protection, waste heat treatment, and overall practicality. It is difficult to meet the actual production needs of large-scale, high-quality quick-freezing of abalone. First, most similar equipment on the market lacks a dedicated vortex tube pre-cooling structure, relying solely on direct liquid nitrogen cooling. The lack of a vibrating conveyor belt and uniform air distribution structure causes abalone to easily stack during transport, resulting in insufficient contact with the cold airflow and poor pre-cooling uniformity. This leads to large temperature fluctuations when entering the liquid nitrogen quick-freezing stage, easily causing damage to the abalone meat and deformation due to sudden temperature changes, affecting the quality of the finished quick-frozen product. Second, most equipment does not use Tesla valve nozzles to increase the cold airflow velocity and lacks structures to enhance heat exchange within the cold air distribution pipe. This results in insufficient cold energy utilization, low pre-cooling efficiency, a large liquid nitrogen quick-freezing load in the subsequent process, high liquid nitrogen consumption, low overall refrigeration efficiency, and increased production and operating costs.

[0004] Furthermore, during the pre-cooling process, the existing equipment lacks a dedicated centralized collection structure for condensation or frost generated on the surface of low-temperature components. This condensation easily drips directly onto the abalone surface, affecting the hygiene and safety of food processing. Simultaneously, the lack of a convenient drainage structure makes it difficult to clean up accumulated water, hindering continuous production. Similar equipment lacks a reasonable plan for recovering and utilizing waste heat generated during the refrigeration process, resulting in direct discharge and energy waste. Operations such as defrosting the equipment compartment and drying the conveyor belt require additional heating components, increasing the complexity of the equipment structure, the failure rate, and subsequent maintenance costs. The overall structural layout is unreasonable, the coordination between components is poor, and the operating procedures are cumbersome, making it difficult to adapt to the actual operating environment of an abalone quick-freezing production line. It has significant shortcomings in improving quick-freezing efficiency, reducing energy consumption, improving hygiene conditions, and enhancing equipment practicality.

[0005] Therefore, there is a need to provide a multi-stage liquid nitrogen quick-freezing device for abalone, which aims to solve the above problems. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a multi-stage liquid nitrogen quick-freezing device for abalone.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage liquid nitrogen quick-freezing device for abalone, comprising a quick-freezing device shell and a vibrating conveyor belt, wherein the vibrating conveyor belt is disposed on the top of the quick-freezing device shell, and a refrigeration component is disposed on the top of the quick-freezing device shell; The refrigeration assembly includes a positioning plate that is snapped onto the top of the quick-freezing device housing. An air pump is installed inside the positioning plate. An air inlet is provided in both the positioning plate and the quick-freezing device housing. A refrigeration pipe is provided inside the positioning plate. Limiting rings are symmetrically fitted on the outside of the refrigeration pipe. Several tangential air inlets are provided in a ring-shaped arrangement at equal intervals inside the refrigeration pipe.

[0008] Preferably, a precooling component is provided above the vibrating conveyor belt. The precooling component includes a cold air distribution pipe, which is fixedly connected to the inside of the positioning plate. A water pipe is provided inside the cold air distribution pipe, and positioning brackets are fixedly connected to the outer wall of the water pipe at equal intervals. The water pipe is fixedly connected to the inside of the cold air distribution pipe through the positioning brackets.

[0009] Preferably, the precooling assembly further includes a plurality of Tesla valve nozzles, which are equidistantly distributed and inserted into the bottom of the cold air distribution pipe. A water collection plate is fixedly connected to the bottom of the positioning plate, and a sealing plug is symmetrically threaded to the bottom of the water collection plate.

[0010] Preferably, the quick-freezing device housing is provided with a gas circulation assembly, the gas circulation assembly includes a defrost plate, the defrost plate is fixedly connected to the top of the positioning plate, the positioning plate and the quick-freezing device housing are provided with a common air outlet, the quick-freezing device housing is provided with an oblique air guide hole, and the quick-freezing device housing is fixedly connected with a positioning tube.

[0011] Preferably, the gas circulation assembly includes a limiting plate, which is fixedly connected to the inside of the positioning tube. The limiting plate has a triangular limiting hole inside. A sealing plate is slidably connected inside the limiting plate. A return spring is fixedly connected to the outer wall of the sealing plate near the limiting plate. The end of the return spring away from the sealing plate is fixedly connected to the limiting plate.

[0012] Preferably, the gas circulation assembly includes a fixing frame, which is fixedly connected to the outer wall of the quick-freezing device housing. A defrosting gun is snapped onto the fixing frame, with one end of the defrosting gun away from the fixing frame sleeved on a positioning tube, and a trigger frame fixedly connected to the other end of the defrosting gun away from the fixing frame.

[0013] Preferably, the refrigeration pipe is fixedly connected to the inside of the positioning plate by a limiting spacer ring assembly, one end of the refrigeration pipe is fixedly connected to a vortex end cap, and there is a gap between the vortex end cap and the refrigeration pipe, and the end of the refrigeration pipe away from the vortex end cap is connected to the cold air distribution pipe.

[0014] Preferably, the Tesla valve nozzle is connected to the cold air distribution pipe, and the water collection plate is sleeved on the outer wall of the Tesla valve nozzle.

[0015] Preferably, the oblique air guide hole is connected to the air outlet hole, the air outlet hole is opened on the side of the refrigeration pipe near the vortex end cover, and the positioning tube is connected to the air outlet hole.

[0016] Preferably, three cylindrical blocks are fixedly connected in a triangular arrangement on the trigger frame, and the cylindrical blocks on the trigger frame correspond to the limiting holes.

[0017] The multi-stage liquid nitrogen quick-freezing device for abalone provided by this invention has the following advantages compared with the prior art: The abalone is pre-cooled using a vortex tube cooling structure. Combined with a vibrating conveyor belt and a uniform air distribution structure, the abalone can fully contact the cold air during transportation, improving the uniformity of pre-cooling and reducing temperature fluctuations when the abalone enters the liquid nitrogen quick-freezing stage. This helps to reduce the impact of sudden temperature changes on the abalone's texture and appearance, and improves the quality of the quick-frozen product.

[0018] The device uses Tesla valve nozzles to increase the flow rate of cold air, making the precooling efficiency higher. At the same time, water pipes are installed in the cold air distribution pipe to further enhance the heat exchange effect, making fuller use of cold energy. This can effectively reduce the load of subsequent liquid nitrogen quick-freezing, reduce liquid nitrogen consumption, improve overall refrigeration efficiency, and reduce production and operating costs.

[0019] During the pre-cooling process, condensation or frost is easily generated on the surface of low-temperature components. This device collects the condensation through a water collection plate to prevent water droplets from dripping directly onto the abalone surface, thus improving the hygiene and safety of the food processing process. The accumulated water can be drained periodically through a sealing plug. The maintenance method is simple and convenient, making it suitable for continuous production.

[0020] The device recovers and utilizes the waste heat generated by the vortex tube. It can switch the hot air output path according to actual production needs. It can defrost and dry the equipment chamber, conveyor belt and other parts through the defrosting gun, and can also insulate and prevent frost on the top of the device through the defrosting plate. There is no need to add additional heating components, which improves energy utilization, simplifies the equipment structure and reduces failure rate and maintenance costs.

[0021] The overall structure is reasonably laid out, the connections of each component are reliable, and the operation is simple and intuitive. It can adapt to the actual use environment of the abalone quick-freezing production line and has obvious advantages in improving quick-freezing effect, reducing energy consumption, improving hygiene conditions and improving equipment practicality. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the overall positional relationship of the device in this invention; Figure 2 This is a cross-sectional view of the overall device in this invention; Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 This is a schematic diagram showing the positional relationship between the air pump, air inlet, and limiting spacer ring assembly in this invention; Figure 5 For the present invention Figure 4 Enlarged view of the structure at point B in the middle; Figure 6 This is a schematic diagram showing the positional relationship between the water pipe, the positioning bracket, and the Tesla valve nozzle in this invention; Figure 7 For the present invention Figure 6 Enlarged view of the structure at point C; Figure 8 For the present invention Figure 6 Enlarged view of the structure at point D; Figure 9 This is a schematic diagram showing the positional relationship between the positioning plate, water collection plate, and sealing plug in this invention; Figure 10 For the present invention Figure 9 Enlarged view of the structure at point E in the middle; Figure 11 This is a schematic diagram showing the positional relationship between the quick-freezing device housing, defrosting gun, and fixing frame in this invention; Figure 12 This is a schematic diagram showing the positional relationship between the air outlet, the oblique air guide hole, and the positioning tube in this invention; Figure 13 For the present invention Figure 12 Enlarged view of the structure at point F in the middle; Figure 14 This is an exploded view of the positioning tube, limiting plate, sealing plate, reset spring, and trigger frame in this invention.

[0023] Reference numerals: 11. Shell of quick-freezing device; 12. Vibrating conveyor belt; The refrigeration components include: 21, positioning plate; 22, air pump; 23, air inlet; 24, limiting spacer ring assembly; 25, refrigeration pipe; 26, tangential air inlet; 27, vortex end cap; The precooling components include: 31. Cold air distribution pipe; 32. Water pipe; 33. Positioning bracket; 34. Tesla valve nozzle; 35. Water collection plate; 36. Sealing plug; The gas circulation assembly includes: 41, air outlet; 42, defrost plate; 43, angled air guide hole; 44, positioning tube; 45, limiting plate; 46, limiting hole; 47, sealing plate; 48, return spring; 49, defrost gun; 410, trigger bracket; 411, fixing bracket. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the invention and are not intended to limit the invention.

[0025] In the description of this invention, the terms “center,” “horizontal,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0027] Implementation, for example Figure 1 , Figure 4 , Figure 5 , Figure 7 As shown, an embodiment of the present invention provides a multi-stage liquid nitrogen quick-freezing device for abalone, including a quick-freezing device housing 11 and a vibrating conveyor belt 12. It should be noted that the multi-stage liquid nitrogen quick-freezing device of the present invention refers to a process where the abalone is pre-cooled in stages by a pre-cooling component before entering the liquid nitrogen cryogenic zone, and then frozen in the subsequent liquid nitrogen quick-freezing zone. This achieves gradient cooling and improves freezing quality, which is part of the multi-stage freezing process of this device. The vibrating conveyor belt 12 is located on the top of the quick-freezing device housing 11, and a refrigeration component is located on the top of the quick-freezing device housing 11. The refrigeration assembly includes a positioning plate 21, which is snapped onto the top of the quick-freezing device housing 11. An air pump 22 is installed inside the positioning plate 21. An air inlet 23 is opened in both the positioning plate 21 and the quick-freezing device housing 11. A refrigeration pipe 25 is arranged inside the positioning plate 21. A limiting spacer ring group 24 is symmetrically sleeved on the outside of the refrigeration pipe 25. Several tangential air inlets 26 are evenly distributed in a ring shape inside the refrigeration pipe 25.

[0028] It should be noted that the vibrating conveyor belt 12 is existing technology. Its structural principle is as follows: the conveyor belt is driven by an eccentric motor to generate high-frequency micro-amplitude vibration, so that the abalone maintains slight tumbling and posture adjustment during the conveying process, avoiding the abalone from stacking and sticking together, while improving the uniformity of material contact with cold air. This structure only serves as a carrier for abalone conveying and posture adjustment. Its specific driving and control methods are existing technology and will not be elaborated here. The refrigeration pipe 25 is fixedly connected to the inside of the positioning plate 21 by the limiting spacer ring group 24. The limiting spacer ring group 24 consists of two annular parts, which are sleeved on the outer wall of the refrigeration pipe 25. This not only achieves the positioning and fixation of the refrigeration pipe 25, but also forms an annular chamber between the refrigeration pipe 25 and the positioning plate 21 to guide the rotational flow of compressed gas. One end of the refrigeration pipe 25 is fixedly connected to a vortex end cap 27. An annular gap is reserved between the vortex end cap 27 and the inner wall of the refrigeration pipe 25 to discharge the hot air flow after vortex separation. The end of the refrigeration pipe 25 away from the vortex end cap 27 is connected to the cold air distribution pipe 31 to discharge the low-temperature air flow after separation.

[0029] like Figure 2 , Figure 3 , Figures 6 to 10 As shown, a precooling component is provided above the vibrating conveyor belt 12. The precooling component includes a cold air distribution pipe 31, which is fixedly connected to the inside of the positioning plate 21. A water pipe 32 is provided inside the cold air distribution pipe 31. Positioning brackets 33 are fixedly connected to the outer wall of the water pipe 32 at equal intervals. The water pipe 32 is fixedly connected to the inside of the cold air distribution pipe 31 through the positioning brackets 33.

[0030] The precooling assembly also includes several Tesla valve nozzles 34, which are equidistantly distributed and inserted into the bottom of the cold air distribution pipe 31. A water collection plate 35 is fixedly connected to the bottom of the positioning plate 21, and a sealing plug 36 is symmetrically threaded to the bottom of the water collection plate 35.

[0031] It should be noted that cooling water or a low-temperature heat exchange medium can be introduced into the water pipe 32 to further enhance the cooling effect of the cold air in the cold air distribution pipe 31 and improve the pre-cooling capacity. This heat exchange method is a conventional heat exchange technique. The Tesla valve nozzle 34 is connected to the cold air distribution pipe 31, allowing the cold air in the cold air distribution pipe 31 to be discharged at high speed through the Tesla valve nozzle 34. The water collecting plate 35 is fitted onto the outer wall of the Tesla valve nozzle 34, which can effectively collect condensate or frost generated on the surface of the pipe due to temperature differences, preventing it from dripping and contaminating the abalone.

[0032] like Figures 11 to 14As shown, a gas circulation assembly is provided on the quick-freezing device housing 11. The gas circulation assembly includes a defrost plate 42, which is fixedly connected to the top of the positioning plate 21. The positioning plate 21 and the quick-freezing device housing 11 are provided with an air outlet 41. An oblique air guide hole 43 is provided inside the quick-freezing device housing 11. A positioning tube 44 is fixedly connected to the quick-freezing device housing 11.

[0033] The gas circulation assembly includes a limiting plate 45, which is fixedly connected inside the positioning tube 44. The limiting plate 45 has a triangular limiting hole 46 inside. A sealing plate 47 is slidably connected inside the limiting plate 45. A return spring 48 is fixedly connected to the outer wall of the sealing plate 47 near the limiting plate 45. The end of the return spring 48 away from the sealing plate 47 is fixedly connected to the limiting plate 45.

[0034] The gas circulation assembly includes a fixing frame 411, which is fixedly connected to the outer wall of the quick-freezing device housing 11. A defrosting gun 49 is snapped onto the fixing frame 411. One end of the defrosting gun 49 away from the fixing frame 411 is sleeved on the positioning tube 44. A trigger frame 410 is fixedly connected to the other end of the defrosting gun 49 away from the fixing frame 411.

[0035] It should be noted that the following are the connection and cooperation relationships of the oblique air guide hole 43, the air outlet 41, the positioning tube 44, and the trigger frame 410: The oblique air guide hole 43 is connected to the air outlet 41, which is located on the side of the refrigeration pipe 25 near the vortex end cover 27, and is used to discharge the hot air flow after vortex separation; the defrost plate 42 is used to evenly discharge the hot air, insulate the top area of ​​the quick-freezing device shell 11, prevent frost and ice formation in low-temperature environments, and ensure normal operation of the equipment. The positioning tube 44 is connected to the air outlet 41 and is used to guide the flow of hot air. Three cylindrical blocks are fixedly connected in a triangular distribution on the trigger frame 410. These cylindrical blocks correspond to the triangular limiting holes 46 on the limiting plate 45. When the defrost gun 49 is inserted into the positioning tube 44, the cylindrical blocks on the trigger frame 410 can pass through the limiting holes 46, push open the sealing plate 47, and realize the conduction of hot air flow.

[0036] Based on the above embodiments, the following is the complete working process and working principle of the above embodiments: Pre-cooling and uniform air distribution steps: Before the abalone enters the quick-freezing device shell 11 for liquid nitrogen quick-freezing, the air pump 22 is first turned on. The air pump 22 draws outside gas into its interior through the air inlet 23, and then delivers compressed gas to the annular chamber between the limiting spacer ring assembly 24 and the refrigeration pipe 25. The limiting spacer ring assembly 24 consists of two rings fitted onto the outer wall of the refrigeration pipe 25, confining the compressed gas within the chamber and guiding it to rotate and flow along the outer wall of the refrigeration pipe 25.

[0037] Rotating gas enters tangentially into the refrigeration pipe 25 through the annularly distributed tangential air inlets 26 on its inner wall, forming a high-speed spiral vortex. As this vortex moves toward the vortex end cap 27, energy separation occurs under centrifugal force: the outer layer of airflow heats up, while the inner layer heats up, forming a low-temperature airflow column. This low-temperature airflow exits along the end of the refrigeration pipe 25 furthest from the vortex end cap 27 and enters the interior of the cold air distribution pipe 31.

[0038] After entering the cold air distribution pipe 31, the cold air comes into full contact with the internal water pipe 32, further enhancing the cooling effect through heat exchange. Once the cold air fills the cold air distribution pipe 31, it is discharged from the Tesla valve nozzles 34, which are evenly distributed at its bottom. Under the action of the Tesla valve structure, the gas velocity is significantly increased, achieving high-speed, uniform cold air injection.

[0039] When the vibrating conveyor belt 12 carries the abalone past the bottom of the positioning plate 21, the vibrating conveyor belt 12 continuously vibrates, causing the abalone to slightly tumble and adjust its posture during the conveying process. This ensures that all surfaces of the abalone can fully contact the high-speed cold air discharged from the Tesla valve nozzle 34, avoiding uneven pre-cooling caused by insufficient local contact and greatly improving the cooling effect. At the same time, the high-speed cold air pre-cools the abalone, quickly removing surface heat and preparing it for subsequent liquid nitrogen deep cooling.

[0040] The abalone is pre-cooled by using a vortex tube cooling structure. Combined with the vibrating conveyor belt 12 and the uniform air distribution structure, the abalone can fully contact the cold air during the transportation process, which improves the uniformity of pre-cooling and reduces the temperature fluctuation when the abalone enters the liquid nitrogen quick-freezing stage. This helps to reduce the impact of sudden temperature changes on the abalone meat quality and appearance, and improves the quality of the quick-frozen product.

[0041] The device uses a Tesla valve nozzle 34 to increase the flow rate of the cold air, making the precooling efficiency higher. At the same time, a water pipe 32 is installed in the cold air distribution pipe 31 to further enhance the heat exchange effect, making fuller use of the cold energy. This can effectively reduce the load of subsequent liquid nitrogen quick-freezing, reduce liquid nitrogen consumption, improve overall refrigeration efficiency, and reduce production and operating costs.

[0042] Condensate collection steps: As cold air continuously exits from the Tesla valve nozzle 34, condensation or frost will form on the surface of the nozzle due to temperature differences. A water collection plate 35, fitted onto the outer wall of the Tesla valve nozzle 34, effectively collects the condensation or frost, preventing it from dripping and contaminating the abalone, thus ensuring food hygiene and safety. When the water in the water collection plate 35 reaches a certain level, workers can unscrew the bottom sealing plug 36 to easily drain the water, preventing bacterial growth or unpleasant odors inside the equipment.

[0043] During the pre-cooling process, condensation or frost is easily generated on the surface of the low-temperature components. This device collects the condensation through the water collection plate 35 to prevent water droplets from dripping directly onto the abalone surface, thereby improving the hygiene and safety of the food processing process. The accumulated water can be drained periodically through the sealing plug 36. The maintenance method is simple and convenient, and it is suitable for continuous production.

[0044] Waste heat recovery and multi-functional application steps: During the process of gas injection from air pump 22 into refrigeration pipe 25, hot air will be discharged from the end of refrigeration pipe 25 away from cold air distribution pipe 31. When defrost gun 49 is fitted onto positioning pipe 44, trigger bracket 410 abuts against sealing plate 47, creating a gap between sealing plate 47 and limiting plate 45. Hot air enters positioning pipe 44 through air outlet 41, then flows into defrost gun 49 through this gap, and finally exits from the end of defrost gun 49 near fixed bracket 411. Workers can use this hot air to defrost the cabin, dry conveyor belts, or preheat inlet air without the need for additional power heating elements, achieving efficient recovery and utilization of waste heat and reducing operating costs.

[0045] When defrosting, drying, or preheating is not required, the operator can pull the defrosting gun 49 away from the positioning tube 44 at the end away from the fixing bracket 411. At this time, the trigger bracket 410 is pulled out simultaneously, releasing the contact with the sealing plate 47. The return spring 48 elastically contracts, pulling the sealing plate 47 and the limiting plate 45 to fit tightly together, sealing the positioning tube 44. When the hot air is discharged through the air outlet 41, because the positioning tube 44 is sealed, the hot air will rise against the current along the inclined air guide hole 43, enter the interior of the defrosting plate 42, and be discharged. This hot air can heat the defrosting plate 42, effectively preventing frost from forming on the top of the quick-freezing device housing 11 due to low temperature, ensuring stable equipment operation, and further improving the flexibility of waste heat utilization.

[0046] The device recovers and utilizes the waste heat generated by the vortex tube. It can switch the hot air output path according to actual production needs. It can defrost and dry the equipment cabin, conveyor belt and other parts through the defrosting gun 49, and also insulate and prevent frost on the top of the device through the defrosting plate 42. There is no need to add additional heating components, which improves energy utilization, simplifies the equipment structure and reduces failure rate and maintenance costs.

[0047] The overall structure is reasonably laid out, the connections of each component are reliable, and the operation is simple and intuitive. It can adapt to the actual use environment of the abalone quick-freezing production line and has obvious advantages in improving quick-freezing effect, reducing energy consumption, improving hygiene conditions and improving equipment practicality.

[0048] While several embodiments and examples of the present invention have been described for those skilled in the art, these embodiments and examples are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included within the scope and spirit of the invention, and are included within the scope of the invention as described in the claims and its equivalents.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-stage liquid nitrogen quick-freezing device for abalone, comprising a quick-freezing device shell (11) and a vibrating conveyor belt (12), wherein the vibrating conveyor belt (12) is disposed on the top of the quick-freezing device shell (11), characterized in that, A refrigeration component is provided on the top of the quick-freezing device housing (11); The refrigeration assembly includes a positioning plate (21), which is snapped onto the top of the quick-freezing device housing (11). An air pump (22) is installed inside the positioning plate (21). An air inlet (23) is opened in both the positioning plate (21) and the quick-freezing device housing (11). A refrigeration pipe (25) is installed inside the positioning plate (21). A limiting ring group (24) is symmetrically sleeved on the outside of the refrigeration pipe (25). Several tangential air inlets (26) are evenly distributed in a ring shape inside the refrigeration pipe (25). A vortex end cap (27) is fixedly connected to one end of the refrigeration pipe (25) with a gap between them. The refrigeration pipe (25) forms a vortex tube refrigeration structure through the tangential air inlets (26) and the vortex end cap (27). The precooling assembly includes a cold air distribution pipe (31) and several Tesla valve nozzles (34). The cold air distribution pipe (31) is fixedly connected inside the positioning plate (21). The cold air distribution pipe (31) is connected to the end of the refrigeration pipe (25) away from the vortex end cap (27). Several Tesla valve nozzles (34) are equidistantly distributed and inserted into the bottom of the cold air distribution pipe (31) to form a uniform air distribution structure. Together with the vibrating conveyor belt (12), the abalone is fully contacted with the cold airflow.

2. The multi-stage liquid nitrogen quick-freezing device for abalone according to claim 1, characterized in that, A precooling assembly is provided above the vibrating conveyor belt (12). The precooling assembly includes a water pipe (32). The water pipe (32) is located inside the cold air distribution pipe (31). Positioning brackets (33) are fixedly connected to the outer wall of the water pipe (32) at equal intervals. The water pipe (32) is fixedly connected to the inside of the cold air distribution pipe (31) through the positioning brackets (33).

3. The multi-stage liquid nitrogen quick-freezing device for abalone according to claim 2, characterized in that, The precooling assembly also includes a water collection plate (35), which is fixedly connected to the bottom of the positioning plate (21), and the bottom of the water collection plate (35) is symmetrically threaded with a sealing plug (36).

4. The multi-stage liquid nitrogen quick-freezing device for abalone according to claim 2, characterized in that, A gas circulation assembly is provided on the quick-freezing device housing (11). The gas circulation assembly includes a defrost plate (42). The defrost plate (42) is fixedly connected to the top of the positioning plate (21). The positioning plate (21) and the quick-freezing device housing (11) are provided with an air outlet (41). The quick-freezing device housing (11) is provided with an oblique air guide hole (43). A positioning tube (44) is fixedly connected to the quick-freezing device housing (11).

5. The multi-stage liquid nitrogen quick-freezing device for abalone according to claim 4, characterized in that, The gas circulation assembly includes a limiting plate (45), which is fixedly connected inside the positioning tube (44). The limiting plate (45) has a triangular limiting hole (46) inside. A sealing plate (47) is slidably connected inside the limiting plate (45). A return spring (48) is fixedly connected to the outer wall of the sealing plate (47) near the limiting plate (45). The end of the return spring (48) away from the sealing plate (47) is fixedly connected to the limiting plate (45).

6. The multi-stage liquid nitrogen quick-freezing device for abalone according to claim 5, characterized in that, The gas circulation assembly includes a fixing frame (411), which is fixedly connected to the outer wall of the quick-freezing device housing (11). A defrosting gun (49) is snapped onto the fixing frame (411). One end of the defrosting gun (49) away from the fixing frame (411) is sleeved on the positioning tube (44). The other end of the defrosting gun (49) away from the fixing frame (411) is fixedly connected to a trigger frame (410).

7. The multi-stage liquid nitrogen quick-freezing device for abalone according to claim 2, characterized in that, The refrigeration pipe (25) is fixedly connected to the inside of the positioning plate (21) by a limiting spacer ring group (24), and there is a gap between the vortex end cap (27) and the refrigeration pipe (25).

8. A multi-stage liquid nitrogen quick-freezing device for abalone according to claim 3, characterized in that, The Tesla valve nozzle (34) is connected to the cold air distribution pipe (31), and the water collection plate (35) is sleeved on the outer wall of the Tesla valve nozzle (34).

9. A multi-stage liquid nitrogen quick-freezing device for abalone according to claim 4, characterized in that, The oblique air guide hole (43) is connected to the air outlet hole (41). The air outlet hole (41) is located on the side of the refrigeration pipe (25) near the vortex end cap (27). The positioning pipe (44) is connected to the air outlet hole (41).

10. A multi-stage liquid nitrogen quick-freezing device for abalone according to claim 6, characterized in that, Three cylindrical blocks are fixedly connected in a triangular arrangement on the trigger frame (410), and the cylindrical blocks on the trigger frame (410) correspond to the limiting holes (46).

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