Defrosting sealing device for tunnel type liquid nitrogen instant freezer

Abstract

A defrosting sealing device for a tunnel type liquid nitrogen instant freezer comprises a box body, the box body comprises a feeding port and a discharging port, a conveying belt is arranged in the box body, the two ends of the conveying belt are arranged at the feeding port and the discharging port respectively, and the defrosting sealing device further comprises a shell. A first guide strip and a second guide strip are arranged on the lower side of the shell side by side in the length direction of the shell, a plurality of nozzles are arranged on the lower side of the first guide strip in the length direction of the first guide strip, a main air pipe is arranged in the shell, one end of the main air pipe is communicated with an air source, and the other end of the main air pipe is communicated with a plurality of branch air pipes. One end of any branch air pipe is connected with the first guide strip and communicated with one spray head, an air outlet of any spray head is higher than the lower end face of the second guide strip, and the shell is arranged on one side of the discharging port in the box body. The air knife has the advantages that the air knife plays a role in sealing and blocking the discharging port, the safety performance of equipment is improved, and meanwhile the air knife plays a role in defrosting products passing through the air knife.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a food conveyor belt, and more particularly to a defrosting sealing device for a tunnel type liquid nitrogen quick freezer. Background Art

[0002] In order to effectively improve food quality and safety, more and more food manufacturers adopt quick freezing technology in the process of food processing, using ammonia, Freon or liquid nitrogen for refrigeration. Liquid nitrogen refrigeration can quickly freeze products and pass through the ice crystal formation zone, preventing large ice crystals from forming in food cells and destroying cell walls. It can better maintain the original flavor and quality of the product, and the environmental benefits are obvious. Therefore, liquid nitrogen refrigeration has become the main trend of food freezing.

[0003] In the prior art, liquid nitrogen quick freezing equipment can generally be divided into cabinet-type liquid nitrogen quick freezing equipment and tunnel-type liquid nitrogen quick freezing equipment. Tunnel-type liquid nitrogen quick freezing equipment is used for multiple batches of food processing and production. After the food to be quick-frozen is placed in the tunnel feed port, the food enters the tunnel for quick freezing along with the transmission of the mesh belt. When the tunnel-type liquid nitrogen quick freezing equipment is working, after the spray system inside the tunnel sprays liquid nitrogen, the liquid nitrogen contacts the air and vaporizes to become a gas state with an extremely low temperature. The tunnel contains several fans with adjustable speed to drive the gas circulation inside the tunnel, so as to achieve the purpose of uniformly and quickly freezing the processed food. However, when using liquid nitrogen for quick freezing of food, the liquid nitrogen inside the tunnel will evaporate quickly and produce a large amount of gas after contacting the air, which poses a safety hazard. At the same time, the surface of the product will frost after quick freezing, and manual defrosting limits production efficiency.

[0004] Specifically, since liquid nitrogen evaporates quickly after contacting the air, it produces a large amount of nitrogen gas and expands rapidly in volume. When it is excessive, it will emerge from the entrance and exit of the tunnel to fill the entire space, slowly replacing the oxygen in the air, reducing the oxygen concentration and suffocating people. When the concentration of nitrogen inhaled is not too high, you will initially feel chest tightness, shortness of breath, and weakness; then you will feel irritable, extremely excited, running around, shouting, trance-like, and unstable gait, which is called "nitrogen intoxication" and you may enter a coma. When inhaling high concentrations, you will quickly become comatose and die due to respiratory and cardiac arrest; the product will frost after being quickly frozen by liquid nitrogen quick-freezing equipment, and defrosting work is required, which affects the processing efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a defrosting sealing device for a tunnel type liquid nitrogen quick freezing machine, the defrosting sealing device for a tunnel type liquid nitrogen quick freezing machine is to solve the technical problems in the prior art that liquid nitrogen gasification has hidden safety hazards in production and manual defrosting limits production efficiency.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A defrosting sealing device for a tunnel-type liquid nitrogen quick-freezing machine comprises a box body, the box body comprises a feed port and a discharge port, a conveyor belt is arranged in the box body, and the two ends of the conveyor belt are respectively arranged at the feed port and the discharge port, and also comprises a shell body, the lower side of the shell body is provided with a first guide bar and a second guide bar arranged in parallel along its length direction, the lower side of the first guide bar is provided with a plurality of nozzles along its length direction, a main air pipe is arranged in the shell body, one end of the main air pipe is connected to an air source, and the other end of the main air pipe is connected to a plurality of bronchial pipes, one end of any one of the bronchial pipes is connected to the first guide bar and is connected to one of the nozzles, the air outlet of any one of the nozzles is higher than the lower side of the second guide bar, and the shell body is arranged on one side of the discharge port in the box body.

[0008] Working principle:

[0009] The tunnel-type liquid nitrogen quick-freezing machine includes a tunnel-type box, a conveyor belt is arranged in the box, and there are multiple liquid nitrogen nozzles in the box. The liquid nitrogen nozzles are installed on the inner wall of the box and connected to the liquid nitrogen source through a set of conveying pipelines. The products that need to be quick-frozen are placed at one end of the conveyor belt. In the process of transporting the products from one end of the conveyor belt to the other end, they are rapidly cooled by liquid nitrogen to achieve the freezing effect. This device is installed above the conveyor belt on one side of the discharge port in the box. This device is connected to the air source. After starting, a wind knife is formed under the first guide bar. The wind knife forms a sealing and blocking effect on the discharge port to prevent a large amount of gasified nitrogen in the box from escaping from the discharge port and causing adverse effects on the staff at the discharge port. On the other hand, the wind knife has a certain impact force. The wind knife has a defrosting effect on the surface of the quick-frozen product passing through the wind knife position, saving the subsequent cleaning time of the product and improving the overall production and processing efficiency.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the wind knife has a sealing and blocking effect on the discharge port, thereby improving the safety performance of the equipment; at the same time, the wind knife has a defrosting effect on the products passing through the wind knife, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a structural schematic diagram of a defrosting sealing device for a tunnel type liquid nitrogen quick freezing machine.

[0012] Figure 2 The utility model is a side view schematic diagram of a defrosting sealing device for a tunnel type liquid nitrogen quick freezing machine.

[0013] Figure 3 The utility model is a side view schematic diagram of a defrosting sealing device for a tunnel type liquid nitrogen quick freezing machine.

[0014] Figure 4 It is a top view schematic diagram of the defrosting sealing device for a tunnel type liquid nitrogen quick freezing machine of the utility model. Implementation Example

[0015] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , the utility model provides a technical solution:

[0016] A defrosting sealing device for a tunnel-type liquid nitrogen quick-freezing machine comprises a box body (not shown in the figure), the box body comprises a feed port and a discharge port, a conveyor belt is arranged in the box body, and the two ends of the conveyor belt are respectively arranged at the feed port and the discharge port, and also comprises a shell body 1, the lower side of the shell body 1 is provided with a first guide bar 2 and a second guide bar 3 arranged in parallel along its length direction, the lower side of the first guide bar 2 is provided with a plurality of nozzles (not shown in the figure) along its length direction, a main air pipe 4 is arranged in the shell body 1, one end of the main air pipe 4 is connected to an air source, and the other end of the main air pipe 4 is connected to a plurality of bronchial pipes 5, one end of any bronchial pipe 5 is connected to the first guide bar 2 and is connected to one of the nozzles, the air outlet of any nozzle is higher than the lower side of the second guide bar 3, and the shell body 1 is arranged on one side of the discharge port in the box body.

[0017] The working process of this embodiment:

[0018] The device is installed above the conveyor belt on one side of the discharge port in the box. The main air pipe 4 is connected to the compressed air source. After startup, the compressed air enters the bronchial pipe 5 through the main air pipe 4 and is ejected from the nozzle to form a wind knife below the first guide bar 2. The second guide bar 3 prevents the compressed air from spraying toward the discharge port and failing to form a seal. The side wall adjacent to the second guide bar 3 and the first guide bar 2 allows the compressed air to spray downward along the side wall. The compressed air blocks the outflow of gasified nitrogen at the discharge port, and the nitrogen leaves the box from the originally designed air path, which will not have an adverse effect on the staff around the discharge port of the box. On the other hand, the compressed air impacts the surface of the quick-frozen product, which will destroy the frost on the surface of the quick-frozen product caused by quick freezing, and has a defrosting effect. The subsequent manual time for defrosting and finishing is reduced or saved, thereby improving production efficiency.

Claims

1. A defrosting sealing device for a tunnel-type liquid nitrogen quick-freezing machine, comprising a box body, the box body comprising a feed port and a discharge port, a conveyor belt is arranged in the box body, and the two ends of the conveyor belt are respectively arranged at the feed port and the discharge port, characterized in that: The invention also comprises a shell (1), wherein a first guide bar (2) and a second guide bar (3) are arranged in parallel on the lower side of the shell (1) along its length direction, and a plurality of nozzles are arranged on the lower side of the first guide bar (2) along its length direction. A main air pipe (4) is arranged in the shell (1), one end of the main air pipe (4) is connected to an air source, and the other end of the main air pipe (4) is connected to a plurality of bronchial pipes (5), one end of any one of the bronchial pipes (5) is connected to the first guide bar (2) and each is connected to one of the nozzles, and the air outlet of any one of the nozzles is higher than the lower side of the second guide bar (3). The shell (1) is arranged on one side of the discharge port in the box.

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