Tunnel type liquid nitrogen refrigeration device

Abstract

The utility model relates to refrigeration device technical field especially relates to a kind of tunnel type liquid nitrogen refrigeration device, it includes tunnel cooling box, refrigeration component and circulating refrigeration mechanism;The circulating refrigeration mechanism includes several circulating bends, several the circulating bends upper end passes to tunnel cooling box inside top, the circulating bend lower end upper side fixed intercommunication installation has bottom cone, the bottom cone is connected with the bottom of tunnel cooling box intercommunication, the circulating bend upper end lower side fixed installation has top pipe, the top pipe lower side is uniformly distributed fixed installation and has several air injection pipes, circulating fan is fixedly installed in the circulating bend middle part.The utility model is set to circulating refrigeration mechanism, using circulating blowing system, lower temperature nitrogen can be recycled in tunnel cooling box inside, nitrogen can be uniformly distributed from upper side to the goods conveyed on conveying belt and uniformly cooled, improve the utilization of cold source, strengthen practicality.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, and in particular to a tunnel-type liquid nitrogen refrigeration device. Background Technology

[0002] In the fields of food processing, pharmaceutical storage, and material handling, cryogenic refrigeration technology is a key link in ensuring product quality and performance. Among them, tunnel-type refrigeration devices are widely used in the rapid cooling or freezing process of various items because they can achieve continuous and large-scale cryogenic processing.

[0003] However, existing tunnel-type liquid nitrogen refrigeration devices still have significant shortcomings in practical applications. After liquid nitrogen completes vaporization and refrigeration within the tunnel cooling box, the resulting nitrogen gas, although still at a low temperature, is usually directly discharged into the external environment. This leads to insufficient utilization of the cold source, resulting in a significant waste of liquid nitrogen resources and increased refrigeration costs. Simultaneously, due to the lack of an effective recycling mechanism, the low-temperature nitrogen gas distribution within the tunnel cooling box is uneven. Items near the liquid nitrogen spray area cool faster, while items further away experience poor cooling, making it difficult to achieve uniform cooling of all items on the conveyor belt and affecting product processing quality and consistency.

[0004] To address the above problems, we propose a tunnel-type liquid nitrogen refrigeration device. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a tunnel-type liquid nitrogen refrigeration device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A tunnel-type liquid nitrogen refrigeration device includes a tunnel cooling box, a refrigeration component, and a circulating refrigeration mechanism. The circulating refrigeration mechanism includes several circulating bends, the upper ends of which pass through to the top of the inner side of the tunnel cooling box. A bottom cone is fixedly installed on the upper side of the lower end of each circulating bend, and the bottom cone is connected to the bottom of the tunnel cooling box. A top through pipe is fixedly installed on the lower side of the upper end of each circulating bend, and several jet pipes are evenly distributed and fixedly installed on the lower side of the top through pipe. A circulating fan is fixedly installed in the middle part of the circulating bend.

[0008] Furthermore, the refrigeration assembly includes a liquid nitrogen delivery pipe that passes through to the inside of the tunnel cooling box and has a longitudinal through pipe fixedly installed at the inner end of the liquid nitrogen delivery pipe. Several transverse branch pipes are fixedly installed at equal intervals on the side of the longitudinal through pipe.

[0009] Furthermore, several of the horizontal branch pipes are staggered from the top through pipe, and several small spray tubes are fixedly installed at equal intervals on the lower side of the horizontal branch pipes.

[0010] Furthermore, a flow control valve is fixedly installed on the liquid nitrogen delivery pipe.

[0011] Furthermore, a conveyor belt is fixedly installed inside the tunnel cooling box, and openings are provided on both sides of the tunnel cooling box, with both ends of the conveyor belt passing through to the outside of the openings.

[0012] Furthermore, filter holes are evenly distributed on the conveyor belt.

[0013] Furthermore, a drainage bend is fixedly installed at the bottom of the circulation bend, and the drainage bend is S-shaped.

[0014] Furthermore, a controller is fixedly installed on the outer wall of the tunnel cooling box, several support legs are symmetrically fixedly installed on both sides of the tunnel cooling box, and a temperature sensor is fixedly installed on the inner wall of the tunnel cooling box.

[0015] Compared with related technologies, the tunnel-type liquid nitrogen refrigeration device proposed in this utility model has the following beneficial effects:

[0016] In this invention, a tunnel-type liquid nitrogen refrigeration device is described. Through a circulating refrigeration mechanism, a circulating fan draws vaporized liquid nitrogen from the tunnel cooling box into a circulating bend through a bottom conical hopper. The nitrogen then flows upwards through the bend and is injected into a jet pipe through a top pipe, eventually being sprayed downwards. Even after vaporization and refrigeration, the temperature of the vaporized nitrogen remains relatively low. The circulating air system allows for the recycling of this low-temperature nitrogen within the tunnel cooling box, ensuring even distribution of the nitrogen as it cools the items conveyed on the conveyor belt. This improves the utilization rate of the cold source and enhances practicality. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a tunnel-type liquid nitrogen refrigeration device proposed in this utility model. Figure 1 ;

[0018] Figure 2 A three-dimensional structural diagram of a tunnel-type liquid nitrogen refrigeration device proposed in this utility model. Figure 2 ;

[0019] Figure 3 A three-dimensional structural diagram of the internal components of the tunnel cooling box;

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the refrigeration component;

[0021] Figure 5 This is a three-dimensional structural diagram of a circulating refrigeration mechanism.

[0022] In the diagram: 1. Tunnel cooling box; 2. Support leg; 3. Controller; 4. Conveyor belt; 5. Filter hole; 6. Refrigeration component; 61. Liquid nitrogen delivery pipe; 62. Flow control valve; 63. Longitudinal pipe; 64. Transverse branch pipe; 65. Liquid spray pipe; 7. Circulating refrigeration mechanism; 71. Circulating bend; 72. Top pipe; 73. Jet pipe; 74. Circulating fan; 75. Bottom cone; 76. Drain bend. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Reference Figures 1-5 A tunnel-type liquid nitrogen refrigeration device includes a tunnel cooling box 1, a refrigeration component 6, and a circulating refrigeration mechanism 7. The circulating refrigeration mechanism 7 includes several circulating bends 71, the upper ends of which pass through to the top of the inner side of the tunnel cooling box 1. A bottom cone 75 is fixedly installed on the upper side of the lower end of the circulating bends 71, and the bottom cone 75 is connected to the bottom of the tunnel cooling box 1. A top through pipe 72 is fixedly installed on the lower side of the upper end of the circulating bends 71. Several jet pipes 73 are evenly distributed and fixedly installed on the lower side of the top through pipe 72. A circulating fan 74 is fixedly installed in the middle part of the circulating bends 71.

[0025] In this method, a drainage bend 76 is fixedly installed at the bottom of the circulation bend 71, and the drainage bend 76 is S-shaped.

[0026] With the above-mentioned setup, condensate is easily formed after the equipment in the refrigeration system stops. The drain bend 76 at the bottom of the circulation bend 71 is used to drain the condensate, avoiding energy loss caused by circulating the condensate for refrigeration. In addition, the frozen condensate can easily cause pipe blockage.

[0027] In this method, the refrigeration component 6 includes a liquid nitrogen delivery pipe 61, which passes through to the inside of the tunnel cooling box 1 and has a longitudinal through pipe 63 fixedly installed at the inner end of the liquid nitrogen delivery pipe 61. Several transverse branch pipes 64 are fixedly installed at equal intervals on the side of the longitudinal through pipe 63. The several transverse branch pipes 64 are staggered from the top through pipe 72. Several small spray pipes 65 are fixedly installed at equal intervals on the lower side of the transverse branch pipes 64.

[0028] With the above-described setup, during refrigeration, liquid nitrogen is introduced into the longitudinal pipe 63 via the liquid nitrogen delivery pipe 61, and then sprayed onto the items conveyed on the lower conveyor belt 4 via the transverse branch pipe 64 from several small spray pipes 65 on the lower side, thereby rapidly cooling the items.

[0029] In this method, a flow control valve 62 is fixedly installed on the liquid nitrogen delivery pipe 61.

[0030] With the above-described configuration, the flow control valve 62 is used to control the flow rate of the liquid nitrogen delivery pipe 61, thereby controlling the cooling rate.

[0031] In this method, a conveyor belt 4 is fixedly installed inside the tunnel cooling box 1, and openings are provided on both sides of the tunnel cooling box 1. The two ends of the conveyor belt 4 pass through to the outside of the openings, and filter holes 5 are evenly distributed on the conveyor belt 4.

[0032] By setting up the filter holes 5 as described above, the bottom of the items being transported on the conveyor belt 4 can also come into full contact with nitrogen, thus improving the cooling effect.

[0033] In this method, a controller 3 is fixedly installed on the outer wall of the tunnel cooling box 1, several support legs 2 are symmetrically fixedly installed on both sides of the tunnel cooling box 1, and a temperature sensor is fixedly installed on the inner wall of the tunnel cooling box 1.

[0034] With the above-described configuration, the temperature sensor is used to monitor the temperature inside the tunnel cooling box 1, which facilitates the controller 3 to perform cooling control.

[0035] The working principle of the tunnel-type liquid nitrogen refrigeration device provided by this utility model is as follows:

[0036] During operation, the items to be cooled are placed on conveyor belt 4, which continuously transports the items through openings on both sides of the tunnel cooling box 1. After the device is started, the refrigeration component 6 begins to work. Liquid nitrogen is transported through liquid nitrogen delivery pipe 61 to longitudinal pipe 63, and then evenly sprayed onto the items inside the tunnel cooling box 1 through spray nozzle 65 via transverse branch pipe 64. The heat absorption property of liquid nitrogen vaporization is used to rapidly cool the items. The flow control valve 62 on the liquid nitrogen delivery pipe 61 can adjust the liquid nitrogen delivery flow rate according to the actual cooling requirements via controller 3 to control the cooling speed.

[0037] Simultaneously, the circulating refrigeration mechanism 7 starts, and the circulating fan 74 runs, drawing the low-temperature nitrogen gas generated by the vaporization of liquid nitrogen at the bottom of the tunnel cooling box 1 into the circulating bend 71 through the bottom conical hopper 75. The low-temperature nitrogen gas flows upward along the circulating bend 71, and after reaching the top through-pipe 72, it is sprayed downward again through the jet pipe 73 to provide secondary cooling for the items on the conveyor belt 4. Because the transverse branch pipe 64 is staggered from the top through-pipe 72, and the jet pipes 73 are evenly distributed, the low-temperature nitrogen gas can be evenly distributed within the tunnel cooling box 1, ensuring consistent cooling effect for all items.

[0038] The evenly distributed filter holes 5 on the conveyor belt 4 allow the low-temperature nitrogen gas at the bottom to fully contact the bottom of the item, further improving the cooling effect. Temperature sensors on the inner wall of the tunnel cooling box 1 monitor the internal temperature in real time and transmit the data to the controller 3. The controller 3 adjusts the refrigeration components 6 and the circulating refrigeration mechanism 7 according to the set temperature to ensure a stable and efficient refrigeration process.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A tunnel type liquid nitrogen refrigeration device, characterized by, It includes a tunnel cooling box (1), a refrigeration assembly (6), and a circulating refrigeration mechanism (7); The circulating refrigeration mechanism (7) includes several circulating bends (71), the upper ends of which pass through to the top of the inner side of the tunnel cooling box (1). A bottom cone (75) is fixedly installed on the upper side of the lower end of the circulating bend (71), and the bottom cone (75) is connected to the bottom of the tunnel cooling box (1). A top through pipe (72) is fixedly installed on the lower side of the upper end of the circulating bend (71), and several jet pipes (73) are evenly distributed and fixedly installed on the lower side of the top through pipe (72). A circulating fan (74) is fixedly installed in the middle part of the circulating bend (71).

2. The tunnel type liquid nitrogen refrigeration device according to claim 1, characterized in that, The refrigeration assembly (6) includes a liquid nitrogen delivery pipe (61), which passes through to the inside of the tunnel cooling box (1) and a longitudinal through pipe (63) is fixedly installed on the inner end of the liquid nitrogen delivery pipe (61). Several transverse branch pipes (64) are fixedly installed at equal intervals on the side of the longitudinal through pipe (63).

3. The tunnel type liquid nitrogen refrigeration device according to claim 2, characterized in that, Several of the horizontal branch pipes (64) are staggered from the top through pipe (72), and several small spray tubes (65) are fixedly installed at equal intervals on the lower side of the horizontal branch pipes (64).

4. The tunnel type liquid nitrogen refrigeration device according to claim 2, characterized in that, A flow control valve (62) is fixedly installed on the liquid nitrogen delivery pipe (61).

5. The tunnel type liquid nitrogen refrigeration device according to claim 1, characterized in that, A conveyor belt (4) is fixedly installed inside the tunnel cooling box (1). Openings are provided on both sides of the tunnel cooling box (1), and the two ends of the conveyor belt (4) pass through to the outside of the openings.

6. The tunnel type liquid nitrogen refrigeration device according to claim 5, characterized in that, The conveyor belt (4) is provided with filter holes (5) evenly distributed.

7. The tunnel type liquid nitrogen refrigeration device according to claim 1, characterized in that, The bottom of the circulation bend (71) is fixedly installed with a drainage bend (76), which is S-shaped.

8. The tunnel type liquid nitrogen refrigeration device according to claim 1, characterized in that, A controller (3) is fixedly installed on the outer wall of the tunnel cooling box (1), and several support legs (2) are symmetrically fixedly installed on both sides of the tunnel cooling box (1). A temperature sensor is fixedly installed on the inner wall of the tunnel cooling box (1).

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