A tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products

Abstract

This utility model discloses a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodles, relating to the field of liquid nitrogen quick-freezing technology. It includes a frame, on which a housing and a wire mesh conveyor mechanism are fixedly installed. The housing has an inlet and an outlet at both ends. A quick-freezing unit, a cleaning unit, a detection unit, and a recovery unit are fixedly installed inside the housing. The wire mesh conveyor mechanism passes through the inlet and outlet. The beneficial effect lies in the use of air-knife type nozzles in conjunction with honeycomb guide plates to rectify and evenly spray cold air containing liquid nitrogen. The flow direction of the cold air is changed by the baffles, allowing it to flow evenly around the product and efficiently cover it from both sides, significantly improving the freezing speed. The motor drives movable parts to flexibly adjust the nozzle angle, and the tilt sensor ensures precise angle adjustment, enabling the cold air to comprehensively and evenly cover products of different thicknesses, shapes, and heights, effectively improving freezing efficiency and quality.

Description

Technical Field

[0001] This utility model relates to the field of liquid nitrogen quick-freezing technology, and in particular to a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products. Background Technology

[0002] In the production process of fresh wet noodles and frozen prepared noodles, tunnel-type liquid nitrogen quick-freezing equipment plays a key role. The quick-freezing equipment freezes the core temperature of the items to -18°C in a short time and quickly passes them through the ice crystal production belt within 30 minutes to reduce the loss of nutrients.

[0003] A search revealed that Chinese patent application CN216384722U discloses a tunnel-type liquid nitrogen quick-freezing device for food production. This device can ensure that when food is placed in a container or removed, cold air is quickly blown onto the surface of the food through a cooling device, increasing the frozen area of ​​the food and thus reducing energy consumption.

[0004] Compared with existing technologies in related fields, it can be seen that the angle and position of the internal cold air nozzles of existing quick-freezing machines are fixed when in use, making it difficult to adapt to different product characteristics. The cold air temperature and flow rate lack precise control, affecting freezing efficiency and product quality. Utility Model Content

[0005] The purpose of this invention is to provide a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] A tunnel-type liquid nitrogen quick-freezing equipment for preserving fresh wet noodle products includes a frame, on which a shell and a wire mesh conveying mechanism are fixedly installed. The shell has an inlet and an outlet at both ends. A quick-freezing unit, a cleaning unit, a detection unit and a recycling unit are fixedly installed inside the shell. The wire mesh conveying mechanism passes through the inlet and outlet.

[0008] The quick-freezing unit includes a motor, moving parts, air-knife type nozzles, and a liquid nitrogen delivery mechanism. The motor is fixedly arranged on the side of the housing, while the moving parts are rotatably arranged inside the housing. The moving parts are fixedly connected to the output shaft of the motor. The air-knife type nozzles are fixedly mounted on the moving parts, and tilt sensors are fixedly mounted on the air-knife type nozzles. Two air-knife type nozzles form a group, and the two air-knife type nozzles in the same group are arranged opposite each other. A honeycomb-shaped guide plate is fixedly mounted on the air outlet end of the air-knife type nozzle, and hexagonal through holes are arranged on the honeycomb-shaped guide plate. The hexagonal through holes are connected to the air-knife type nozzles. The liquid nitrogen delivery mechanism is fixedly mounted on the frame and is connected to the air-knife type nozzles.

[0009] Furthermore, the cleaning unit includes a support frame, which is fixedly arranged inside the housing. The lower end of the support frame is located between two oppositely arranged air knife nozzles. The lower end of the support frame has an installation cavity, in which a bidirectional telescopic mechanism is fixedly installed. The telescopic end of the bidirectional telescopic mechanism is slidably connected to the support frame. An installation plate is fixedly installed on the telescopic end of the bidirectional telescopic mechanism. Cleaning strips are arranged on the sides of the installation plate and the corresponding sides of the air knife nozzles.

[0010] Furthermore, the recovery unit includes a gas collection pipe and a heat exchanger mechanism. The gas collection pipe is fixedly installed on the inner upper surface of the casing and is located above the air knife type nozzle. The heat exchanger mechanism is fixedly installed on the frame. The heat exchange end of the heat exchanger is connected to the gas collection pipe, and the cooling end of the heat exchanger mechanism is connected to the liquid nitrogen delivery mechanism.

[0011] Furthermore, the detection unit includes a flow rate sensor and a temperature sensor, which are fixedly arranged on both sides inside the housing.

[0012] Furthermore, spoilers are fixedly arranged on both sides of the interior of the casing, and the spoilers are wavy.

[0013] Furthermore, the wire mesh conveying mechanism has arc-shaped protrusions fixedly arranged on the mesh belt.

[0014] Furthermore, both the inlet and outlet are fixedly equipped with shielding curtains.

[0015] The advantages compared to existing technologies are as follows:

[0016] 1. By using air-knife-type nozzles in conjunction with honeycomb baffles, cold air containing liquid nitrogen is rectified and sprayed out evenly. The direction of the cold air flow is changed by the baffles, so that it flows evenly around the product and efficiently covers the product from both sides, greatly improving the freezing speed. The motor drives the moving parts to flexibly adjust the nozzle angle, and the tilt sensor ensures that the angle adjustment is accurate, so that the cold air can fully and evenly cover products of different thicknesses, shapes and heights, effectively improving freezing efficiency and quality.

[0017] 2. The bidirectional telescopic mechanism of the cleaning unit moves the mounting plate and cleaning strip, which can reach deep into the through holes of the honeycomb guide plate for cleaning, preventing frost blockage, ensuring that cold air is blown out normally and evenly distributed, and maintaining stable equipment operation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a cross-sectional structural diagram of the frame, housing, and moving parts of a tunnel-type liquid nitrogen quick-freezing equipment for preserving fresh wet noodle products, as described in this utility model.

[0020] Figure 2 This utility model describes a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products. Figure 1 Enlarged structural diagram at point A in the middle;

[0021] Figure 3 This utility model describes a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products. Figure 1 Enlarged structural diagram at point B;

[0022] Figure 4 This utility model describes a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products. Figure 1 Enlarged structural diagram at point C;

[0023] Figure 5 This is a first isometric structural schematic diagram of a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products according to the present invention;

[0024] Figure 6 This is a second isometric structural schematic diagram of a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products according to the present invention;

[0025] Figure 7 This is a schematic diagram of the cross-sectional structure of the casing of a tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products, as described in this utility model.

[0026] The annotations in the attached figures are explained as follows:

[0027] 1. Frame; 2. Housing; 301. Motor; 302. Moving parts; 303. Air knife type nozzle; 304. Honeycomb guide plate; 305. Tilt sensor; 306. Liquid nitrogen conveying mechanism; 401. Support frame; 402. Bidirectional telescopic mechanism; 403. Mounting plate; 404. Cleaning strip; 501. Gas collection pipe; 502. Heat exchanger mechanism; 6. Flow rate sensor; 7. Temperature sensor; 8. Baffle plate; 9. Wire mesh conveying mechanism; 10. Arc-shaped convex strip; 11. Feed inlet; 12. Discharge outlet; 13. Shielding curtain. Detailed Implementation

[0028] like Figures 1-7As shown, a tunnel-type liquid nitrogen quick-freezing equipment for preserving fresh wet noodles includes a frame 1. A housing 2 and a wire mesh belt conveyor 9 are fixedly installed on the frame 1. An inlet 11 and an outlet 12 are respectively provided at both ends of the housing 2. A quick-freezing unit, a cleaning unit, a detection unit, and a recycling unit are fixedly installed inside the housing 2. The wire mesh belt conveyor 9 passes through the inlet 11 and the outlet 12. Products requiring quick-freezing are placed onto the wire mesh belt conveyor 9, and the wire mesh belt conveyor 9 conveys the products through the inlet 11. The product is sent into the casing 2, where it is conveyed by blowing cold air through the quick-freezing unit. At the same time, the temperature and cold air flow rate inside the casing 2 are detected by the detection unit for easy control. The residual cold energy is recovered and reused by the recovery unit, and the quick-freezing unit is cleaned by the cleaning unit to prevent frost from affecting the flow of cold air. After the product is quick-frozen on the wire mesh conveying mechanism 9, the wire mesh conveying mechanism 9 discharges and collects the frozen product through the discharge port 12, thus completing the quick-freezing operation of the product.

[0029] like Figures 1-3 , Figure 6As shown, the quick-freezing unit includes a motor 301, a movable part 302, an air-knife type nozzle 303, and a liquid nitrogen delivery mechanism 306. The motor 301 is fixedly arranged on the side of the housing 2, and the movable part 302 is rotatably arranged inside the housing 2. The movable part 302 is fixedly connected to the output shaft of the motor 301. The air-knife type nozzle 303 is fixedly mounted on the movable part 302, and an angle sensor 305 is fixedly mounted on the air-knife type nozzle 303. Two air-knife type nozzles 303 form a group, and the two air-knife type nozzles 303 in the same group are arranged opposite each other. A honeycomb-shaped guide plate 304 is fixedly installed on the air outlet end of the air knife-type nozzle 303. Hexagonal through holes are arranged on the honeycomb-shaped guide plate 304, connecting to the air knife-type nozzle 303. A liquid nitrogen conveying mechanism 306 is fixedly installed on the frame 1, connecting to the air knife-type nozzle 303. During quick-freezing of the product, cold air containing liquid nitrogen is conveyed to the air knife-type nozzle 303 through the liquid nitrogen conveying mechanism 306 and sprayed out through the air outlet end of the air knife-type nozzle 303. Simultaneously, through the honeycomb-shaped guide plate 304... The hexagonal through-holes on the guide plate 304 rectify the cold air ejected from the air knife-type nozzle 303, resulting in a uniform airflow distribution. This allows the cold air to better cover and quickly freeze the product, effectively improving the freezing speed and quality. The air knife-type nozzles 303 blow air onto the product from both sides. Simultaneously, during freezing, based on the product's thickness, shape, and height, the motor 301 drives the movable part 302 to rotate, which in turn drives the air knife-type nozzles 303 to... Rotate and adjust the angle of the air knife nozzle 303 so that the cold air sprayed from the air knife nozzle 303 covers the product at a suitable angle, ensuring the uniformity and comprehensiveness of the cold air coverage, thereby better freezing the product and effectively improving freezing efficiency and quality. During the angle adjustment process of the air knife nozzle 303, the tilt angle of the air knife nozzle 303 is detected by the tilt sensor 305, thereby ensuring the accuracy of the adjustment angle of the air knife nozzle 303 and facilitating better rapid freezing of the product by blowing cold air.

[0030] like Figures 1-3As shown, the cleaning unit includes a support frame 401, which is fixedly arranged inside the housing 2. The lower end of the support frame 401 is located between two opposing air knife nozzles 303. An installation cavity is provided inside the lower end of the support frame 401, and a bidirectional telescopic mechanism 402 is fixedly installed within the installation cavity. The telescopic end of the bidirectional telescopic mechanism 402 is slidably connected to the support frame 401. An installation plate 403 is fixedly installed on the telescopic end of the bidirectional telescopic mechanism 402. Cleaning strips 404 are arranged on the sides of the installation plate 403 and the corresponding sides of the air knife nozzles 303. When the air knife nozzles 303 are rotated to a horizontal position, the air... The honeycomb-shaped guide plate 304 on the blade nozzle 303 is at the same height as the mounting plate 403. The through holes on the honeycomb-shaped guide plate 304 correspond to the cleaning strips 404 on the mounting plate 403. The mounting plate 403 is moved by the bidirectional telescopic mechanism 402, and the mounting plate 403 moves the cleaning strips 404, so that the cleaning strips 404 enter the through holes on the honeycomb-shaped guide plate 304, thereby cleaning the through holes on the honeycomb-shaped guide plate 304, preventing frost from clogging the through holes on the honeycomb-shaped guide plate 304, ensuring the air blowing of the honeycomb-shaped guide plate 304, and making the cold air enter the housing 2 evenly.

[0031] like Figure 1 , Figure 6 , Figure 7 As shown, the recovery unit includes a gas collecting pipe 501 and a heat exchanger mechanism 502. The gas collecting pipe 501 is fixedly installed on the inner upper surface of the casing 2, and is located above the air knife type nozzle 303. The heat exchanger mechanism 502 is fixedly installed on the frame 1. The heat exchange end of the heat exchanger is connected to the gas collecting pipe 501, and the cooling end of the heat exchanger mechanism 502 is connected to the liquid nitrogen conveying mechanism 306. After the cold air in the casing 2 is heated, the low-temperature exhaust gas enters the heat exchanger mechanism 502 through the gas collecting pipe 501. The heat exchanger mechanism 502 heats the low-temperature exhaust gas, so that the cold energy in the low-temperature exhaust gas is transferred to the heat exchanger mechanism 502. Then, the heat exchanger mechanism 502 conveys the cold energy to the liquid nitrogen conveying mechanism 306 to pre-cool the liquid nitrogen conveying mechanism 306, reduce the heat absorption and volatilization of the liquid nitrogen conveying mechanism 306 during the conveying and storage of nitrogen, reduce waste, and improve energy utilization efficiency.

[0032] like Figure 1 , Figure 7 As shown, the detection unit includes a flow rate sensor 6 and a temperature sensor 7. The flow rate sensor 6 and the temperature sensor 7 are fixedly arranged on both sides inside the housing 2. The temperature sensor 7 detects the temperature in different areas inside the housing 2, and the flow rate sensor 6 detects the cold air flow rate in different areas inside the housing 2. This allows for the adjustment of the temperature and cold air flow rate in different areas inside the housing 2, achieving stable temperature control inside the housing 2 and better freezing of the product.

[0033] like Figure 1 , Figure 7 As shown, baffles 8 are fixedly arranged on both sides of the inside of the casing 2. The baffles 8 are wavy. When the cold air flows inside the casing 2 during the production process, the cold air collides with the baffles 8. Since the baffles 8 are wavy, the direction of the airflow is changed by the baffles 8, so that the cold air flows evenly around the quick-frozen product, thereby cooling the product evenly and improving the cooling effect.

[0034] like Figure 4 As shown, the wire mesh conveying mechanism 9 has arc-shaped protrusions 10 fixedly arranged on the mesh belt. The arc-shaped protrusions 10 support the quick-frozen products, increase the gap between the products and the wire mesh conveying mechanism 9, facilitate the entry of cold air, thereby better cooling the products and reducing the adhesion of the products to the wire mesh conveying mechanism 9.

[0035] like Figure 1 , Figure 5 , Figure 6 As shown, both the inlet 11 and the outlet 12 are fixedly installed with a shielding curtain 13. The shielding curtain 13 will not affect the products passing through the inlet 11 and the outlet 12. During the production process, the shielding curtain 13 blocks the inlet 11 and the outlet 12, reducing the loss of cold air inside the casing 2, thereby reducing the waste of liquid nitrogen.

[0036] Working principle: such as Figure 1 , Figures 4-6 As shown, the product requiring speed is placed on the wire mesh conveyor mechanism 9 near the feed inlet 11. The product is supported by the arc-shaped convex strip 10. The wire mesh conveyor mechanism 9 conveys the product into the machine housing 2 through the feed inlet 11. When the product enters the machine housing 2, the feed inlet 11 and the discharge outlet 12 are blocked by the shielding curtain 13 to reduce the loss of cold air inside the machine housing 2.

[0037] like Figures 1-3 , Figure 6 As shown, based on the product's thickness, shape, and height, the motor 301 drives the movable part 302 to rotate, which in turn drives the air knife nozzle 303 to rotate, adjusting the angle of the air knife nozzle 303. The tilt angle of the air knife nozzle 303 is then detected by the tilt sensor 305.

[0038] like Figures 1-3 , Figure 6 , Figure 7As shown, cold air containing liquid nitrogen is delivered to the air knife nozzle 303 by the liquid nitrogen delivery mechanism 306 and sprayed out through the air outlet of the air knife nozzle 303. At the same time, the cold air sprayed out by the air knife nozzle 303 is rectified by the honeycomb guide plate 304, so that the sprayed cold air forms a uniform airflow distribution. Then, the direction of the airflow is changed by the baffle plate 8, so that the cold air flows evenly around the quick-frozen product, so that the cold air can better cover and quick-freeze the product.

[0039] like Figure 1 , Figure 7 As shown, during the product freezing process, the temperature of different areas inside the casing 2 is detected by the temperature sensor 7, and the cold air flow rate of different areas inside the casing 2 is detected by the flow rate sensor 6, thereby adjusting the temperature and cold air flow rate of different areas inside the casing 2.

[0040] like Figure 1 , Figure 6 , Figure 7 As shown, after the cold air inside the casing 2 is heated, the low-temperature exhaust gas enters the heat exchanger mechanism 502 through the gas collection pipe 501. The heat exchanger mechanism 502 heats the low-temperature exhaust gas, so that the cold energy in the low-temperature exhaust gas is transferred to the heat exchanger mechanism 502. Then, the heat exchanger mechanism 502 delivers the cold energy to the liquid nitrogen delivery mechanism 306 for pre-cooling.

[0041] like Figures 1-3 , Figure 6 As shown, after working for a period of time, the motor 301 drives the movable part 302 to rotate, which in turn drives the air knife nozzle 303 to rotate, so that the air knife nozzle 303 rotates to a horizontal position. The bidirectional telescopic mechanism 402 drives the mounting plate 403 to move, and the mounting plate 403 drives the cleaning strip 404 to move, so that the cleaning strip 404 enters the through hole on the honeycomb guide plate 304, thereby cleaning the through hole on the honeycomb guide plate 304 and reducing the blockage caused by frost on the honeycomb guide plate 304.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products, characterized in that, The machine includes a frame (1), on which a housing (2) and a wire mesh conveying mechanism (9) are fixedly installed. The housing (2) has an inlet (11) and an outlet (12) at its two ends. A quick-freezing unit, a cleaning unit, a detection unit and a recycling unit are fixedly installed inside the housing (2). The wire mesh conveying mechanism (9) passes through the inlet (11) and the outlet (12). The quick-freezing unit includes a motor (301), a movable part (302), an air-knife type nozzle (303), and a liquid nitrogen delivery mechanism (306). The motor (301) is fixedly arranged on the side of the housing (2), and the movable part (302) is rotatably arranged inside the housing (2). The movable part (302) is fixedly connected to the output shaft of the motor (301). The air-knife type nozzle (303) is fixedly installed on the movable part (302), and an angle sensor (305) is fixedly installed on the air-knife type nozzle (303). Two air knife nozzles (303) are grouped together. The two air knife nozzles (303) in the same group are arranged opposite each other. A honeycomb guide plate (304) is fixedly installed on the air outlet end of the air knife nozzle (303). Hexagonal through holes are arranged on the honeycomb guide plate (304) and the hexagonal through holes are connected to the air knife nozzle (303). The liquid nitrogen delivery mechanism (306) is fixedly installed on the frame (1) and the liquid nitrogen delivery mechanism (306) is connected to the air knife nozzle (303).

2. The tunnel-type liquid nitrogen quick-freezing equipment for preserving fresh wet noodle products according to claim 1, characterized in that: The cleaning unit includes a support frame (401), which is fixedly arranged inside the housing (2). The lower end of the support frame (401) is located between two oppositely arranged air knife type nozzles (303). The lower end of the support frame (401) is provided with an installation cavity. A bidirectional telescopic mechanism (402) is fixedly installed in the installation cavity. The telescopic end of the bidirectional telescopic mechanism (402) is slidably connected to the support frame (401). An installation plate (403) is fixedly installed on the telescopic end of the bidirectional telescopic mechanism (402). Cleaning strips (404) are arranged on the sides of the installation plate (403) and the corresponding sides of the air knife type nozzles (303).

3. The tunnel-type liquid nitrogen quick-freezing equipment for preserving fresh wet noodle products according to claim 1, characterized in that: The recovery unit includes a gas collecting pipe (501) and a heat exchanger mechanism (502). The gas collecting pipe (501) is fixedly installed on the inner upper surface of the housing (2) and is located above the air knife type nozzle (303). The heat exchanger mechanism (502) is fixedly installed on the frame (1). The heat exchange end of the heat exchanger is connected to the gas collecting pipe (501), and the cooling end of the heat exchanger mechanism (502) is connected to the liquid nitrogen delivery mechanism (306).

4. The tunnel-type liquid nitrogen quick-freezing equipment for preserving fresh wet noodle products according to claim 1, characterized in that: The detection unit includes a flow rate sensor (6) and a temperature sensor (7), which are fixedly arranged on both sides inside the housing (2).

5. A tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products according to claim 1, characterized in that: The housing (2) has baffles (8) fixedly arranged on both sides inside, and the baffles (8) are wavy.

6. A tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products according to claim 1, characterized in that: The wire mesh conveying mechanism (9) has arc-shaped protrusions (10) fixedly arranged on the mesh belt.

7. A tunnel-type liquid nitrogen quick-freezing device for preserving fresh wet noodle products according to claim 1, characterized in that: Both the feed inlet (11) and the discharge outlet (12) are fixedly installed with a shielding curtain (13).

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