Cryogenic apparatus cooling device

Abstract

The utility model relates to low temperature cooling technical field, specifically disclose a kind of ultra-low temperature equipment cooling device, including cooling chamber component, the input end of cooling chamber component is connected with liquid nitrogen tank, and the input end of liquid nitrogen tank is connected with rectifying column, the input end of rectifying column is connected with cryogenic refrigerator, and the input end of cryogenic refrigerator is connected with filter, the input end of filter is connected with pre-cooler, and the input end of pre-cooler is connected with air compressor, the output end of cooling chamber component is connected with heat exchanger, and the output end of heat exchanger is connected with packed bed.The utility model is combined with the pre-cooler and cryogenic refrigerator of being set, pre-cooler reduces air temperature, reduces cryogenic refrigerator load, and cryogenic refrigerator is realized nitrogen gas preferential liquefaction by expansion or pressure reduction, improves separation efficiency;Liquid nitrogen is output from rectifying column, and through cooling chamber, heat exchanger, packed bed circulation back cryogenic refrigerator, realizes cold recovery, reduces liquid nitrogen consumption.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic cooling technology, and in particular to a cryogenic equipment cooling device. Background Technology

[0002] Cryogenic cooling systems are specialized devices capable of generating and maintaining extremely low temperature environments, widely used in scientific research, industry, and medical fields. They lower the temperature of a target object or space to ultra-low temperature ranges through physical or chemical methods to meet specific process or experimental requirements.

[0003] One of the mainstream methods for achieving ultra-low temperature environments is to use liquid nitrogen for cooling, either directly or indirectly. However, traditional liquid nitrogen cooling devices have significant drawbacks.

[0004] In the process of liquid nitrogen preparation or use, traditional cooling systems often lack effective energy tiered utilization. Ambient air is directly compressed and enters the cryogenic liquefaction unit, which causes the cryogenic unit to face a huge initial heat load, resulting in low liquefaction efficiency and significant energy consumption.

[0005] Secondly, in the cooling process, the evaporated low-temperature nitrogen is usually directly discharged into the atmosphere, and the huge amount of cold energy it carries cannot be effectively recovered, resulting in a huge waste of cold energy and liquid nitrogen consumption, and high operating costs. Summary of the Invention

[0006] The purpose of this invention is to provide a cooling device for cryogenic equipment. By combining a precooler and a cryocooler, the precooler lowers the air temperature and reduces the load on the cryocooler, while the cryocooler achieves preferential liquefaction of nitrogen through expansion or decompression, thereby improving separation efficiency. After liquid nitrogen is output from the distillation column, it is circulated back to the cryocooler through the cooling chamber, heat exchanger, and packed bed to achieve cold energy recovery and reduce liquid nitrogen consumption, thus solving the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a cryogenic equipment cooling device, comprising a cooling chamber assembly, wherein the input end of the cooling chamber assembly is connected to a liquid nitrogen tank, and the input end of the liquid nitrogen tank is connected to a distillation column, the input end of the distillation column is connected to a cryogenic cooler, and the input end of the cryogenic cooler is connected to a filter, the input end of the filter is connected to a precooler, and the input end of the precooler is connected to an air compressor, the output end of the cooling chamber assembly is connected to a heat exchanger, and the output end of the heat exchanger is connected to a packed bed, wherein a liquid nitrogen spraying assembly is installed inside the cooling chamber assembly, and a workpiece placement assembly is arranged below the liquid nitrogen spraying assembly.

[0008] Preferably, the cooling chamber assembly includes a cooling chamber, the front end of which is rotatably connected to a heavy-duty sealing door via a hinge.

[0009] Preferably, the liquid nitrogen spraying assembly includes a spray pipe, and a liquid nitrogen pump is installed at the connection between the spray pipe and the liquid nitrogen tank.

[0010] Preferably, a support frame is provided on the outside of the spray pipe, and the support frame is welded to the inner wall of the cooling chamber, and multiple spray heads are fixed at the bottom of the spray pipe.

[0011] Preferably, the workpiece placement assembly includes a low-temperature resistant base fixed to the bottom of the cooling chamber, a rotating disk rotatably connected to the top of the low-temperature resistant base, a drive gear rotatably connected inside the low-temperature resistant base, and a driven gear meshing with the side of the drive gear.

[0012] Preferably, a fan is connected between the heat exchanger and the cryocooler via a pipe.

[0013] Preferably, the spraying direction of the spray head is towards the rotating disk, and the spray head is interconnected with the liquid nitrogen tank through a spray pipe, a liquid nitrogen pump, and a liquid nitrogen tank.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. By combining the precooler and the cryocooler, the precooler lowers the air temperature and reduces the load on the cryocooler, while the cryocooler achieves preferential liquefaction of nitrogen through expansion or decompression, thereby improving separation efficiency; after liquid nitrogen is output from the distillation column, it is circulated back to the cryocooler through the cooling chamber, heat exchanger, and packed bed to achieve cold energy recovery and reduce liquid nitrogen consumption.

[0016] 2. With the workpiece placement component, after the workpiece is placed on top of the rotating disk, it can rotate with the rotating disk, which facilitates uniform cooling of the workpiece placed on the rotating disk. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is an overall structural view of the present invention;

[0019] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0020] Figure 3 This is a half-sectional structural diagram of the cooling chamber of this utility model;

[0021] Figure 4 This is a half-sectional structural diagram of the low-temperature resistant base of this utility model;

[0022] Figure 5 This is a schematic diagram of the working process of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Cooling chamber assembly; 101. Cooling chamber; 102. Heavy-duty sealed door; 2. Liquid nitrogen spraying assembly; 201. Liquid nitrogen pump; 202. Spray pipe; 203. Spray head; 204. Support frame; 3. Workpiece placement assembly; 301. Cryogenic base; 302. Rotary disc; 303. Driven gear; 304. Driven gear; 4. Distillation column; 5. Cryogenic cooler; 6. Precooler; 7. Air compressor; 8. Filter; 9. Packed bed; 10. Heat exchanger; 11. Liquid nitrogen tank. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a technical solution:

[0027] Please see Figures 1 to 5 A cryogenic equipment cooling device includes a cooling chamber assembly 1. The input end of the cooling chamber assembly 1 is connected to a liquid nitrogen tank 11, and the input end of the liquid nitrogen tank 11 is connected to a distillation column 4. The input end of the distillation column 4 is connected to a cryogenic cooler 5, and the input end of the cryogenic cooler 5 is connected to a filter 8. The input end of the filter 8 is connected to a precooler 6, and the input end of the precooler 6 is connected to an air compressor 7. The output end of the cooling chamber assembly 1 is connected to a heat exchanger 10, and the output end of the heat exchanger 10 is connected to a packed bed 9. A liquid nitrogen spraying assembly 2 is installed inside the cooling chamber assembly 1, and a workpiece placement assembly 3 is arranged below the liquid nitrogen spraying assembly 2.

[0028] The cooling chamber assembly 1 includes a cooling chamber 101, and a heavy-duty sealing door 102 is rotatably connected to the front end of the cooling chamber 101 via a hinge. The liquid nitrogen spraying assembly 2 includes a spray pipe 202, and a liquid nitrogen pump 201 is installed at the connection between the spray pipe 202 and the liquid nitrogen tank 11. A support frame 204 is provided on the outside of the spray pipe 202, and the support frame 204 is welded to the inner wall of the cooling chamber 101. Multiple spray heads 203 are fixed at the bottom of the spray pipe 202.

[0029] By adopting the above technical solution, when it is necessary to cool the workpiece, after opening the heavy-duty sealing door 102, the workpiece is placed on the workpiece placement assembly 3, and then the heavy-duty sealing door 102 is closed. The liquid nitrogen pump 201 is started, and liquid nitrogen is sprayed out from the spray head 203 at the bottom of the spray pipe 202. The liquid nitrogen comes into contact with the workpiece to achieve rapid low-temperature cooling.

[0030] During cooling, the air is first compressed to the required pressure by the air compressor 7, then its temperature is initially reduced by the precooler 6. After being filtered by the filter 8, the precooled air is further cooled by the multi-stage expander or pressure reducing valve of the cryogenic unit 5. During the expansion process, nitrogen gas, due to its lower boiling point of -196℃, preferentially liquefies, while oxygen gas remains gaseous at -183℃. The liquid air enters the interior of the distillation column 4, where oxygen and nitrogen are separated through repeated evaporation and condensation. The liquid nitrogen is then transported to the liquid nitrogen tank 11 for storage. When liquid nitrogen is needed, it can be transported to the cooling chamber 101. Because the temperature of the cooling chamber 101 is higher than that of the liquid nitrogen, the liquid nitrogen rapidly vaporizes and expands in volume, causing the air temperature to drop sharply. The low-temperature nitrogen gas flowing out of the cooling chamber 101 enters the heat exchanger 10 to exchange heat with the medium to be cooled. The low-temperature nitrogen gas passing through the heat exchanger 10 enters the packed bed 9, where it is filled... Bed 9 is filled with a material with high thermal conductivity, such as metal particles or ceramic balls. Low-temperature nitrogen gas is in full contact with the material in the packed bed 9, and its temperature is further reduced through heat conduction, achieving deep cooling. Then, the low-temperature nitrogen gas flowing out of the packed bed 9 re-enters the cryostat 5 and exchanges heat with the pre-cooled air. The low-temperature nitrogen gas absorbs heat from the air and its temperature rises, and it partially vaporizes. The air is further cooled to below the liquefaction temperature, realizing the recycling of nitrogen gas and the continuous operation of the system. The precooler 6 and the cryostat 5 are combined. The precooler 6 reduces the air temperature and reduces the load on the cryostat 5, while the cryostat 5 achieves preferential liquefaction of nitrogen gas through expansion or decompression, improving the separation efficiency. After liquid nitrogen is output from the distillation column 4, it is circulated back to the cryostat 5 through the cooling chamber 101, heat exchanger 10, and packed bed 9, realizing the recovery of cold energy and reducing liquid nitrogen consumption.

[0031] Specifically, such as Figure 4 As shown, the workpiece placement assembly 3 includes a low-temperature resistant base 301 fixed to the bottom of the cooling chamber 101. A rotating disk 302 is rotatably connected to the top of the low-temperature resistant base 301. A drive gear 304 is rotatably connected inside the low-temperature resistant base 301, and a driven gear 303 is meshed with the side of the drive gear 304.

[0032] A fan is connected between the heat exchanger 10 and the cryogenic cooler 5 via a pipe. The spray head 203 sprays towards the rotating disk 302. The spray head 203 is connected to the liquid nitrogen tank 11 via the spray pipe 202, the liquid nitrogen pump 201, and the liquid nitrogen tank 11.

[0033] By adopting the above technical solution, a low-temperature resistant motor is also connected to the middle of the driving gear 304. After the low-temperature resistant motor is started, it can drive the driving gear 304 to rotate through the power output end, and drive the driven gear 303 to rotate under the action of the teeth. A connecting shaft is fixed in the middle of the driven gear 303, and the connecting shaft is connected to the rotating disk 302. When the driven gear 303 rotates, it can drive the rotating disk 302 to rotate slowly through the connecting shaft. A rubber pad is set on the surface of the rotating disk 302 to increase the friction between the workpiece and the rotating disk 302. The workpiece placed on the surface of the rotating disk 302 rotates with the rotating disk 302 under the action of friction, which facilitates uniform cooling of the workpiece placed on the rotating disk 302. Through the set workpiece placement component 3, after the workpiece is placed on the top of the rotating disk 302, it can drive the workpiece to rotate with the rotating disk 302, which facilitates uniform cooling of the workpiece placed on the rotating disk 302.

[0034] Working principle: During cooling, air is first compressed to the required pressure by air compressor 7, then pre-cooled by pre-cooler 6. After being filtered by filter 8, the pre-cooled air passes through cryocooler 5 and undergoes further cooling via multi-stage expander or pressure reducing valve. During expansion, nitrogen, due to its lower boiling point of -196℃, preferentially liquefies, while oxygen remains gaseous at -183℃. The liquid air enters the interior of distillation column 4, where oxygen and nitrogen are separated through repeated evaporation and condensation. Distillation column 4 is divided into an upper column and a lower column. The lower column initially separates the nitrogen into an oxygen-rich liquid. Air and liquid nitrogen are used in the upper column. The oxygen-enriched liquid air is throttled to the lower part of the upper column, while the liquid nitrogen is throttled to the top. Inside the upper column, the rising gas and descending liquid come into countercurrent contact. Nitrogen continuously evaporates from the liquid, and oxygen continuously condenses from the gas, eventually resulting in liquid oxygen at the bottom of the upper column. The liquid nitrogen is then transported to liquid nitrogen tank 11 for storage. When liquid nitrogen is needed, it can be transported to the cooling chamber 101. Because the temperature of the cooling chamber 101 is higher than that of the liquid nitrogen, the liquid nitrogen rapidly vaporizes and expands in volume, causing a sharp drop in air temperature. The low-temperature nitrogen gas flowing out of the cooling chamber 101 enters the heat exchanger... Heat exchanger 10 exchanges heat with the medium to be cooled. The low-temperature nitrogen gas passing through heat exchanger 10 enters the packed bed 9, which is filled with materials with high thermal conductivity, such as metal particles or ceramic balls. The low-temperature nitrogen gas is in full contact with the materials in the packed bed 9, further reducing its temperature through heat conduction, achieving deep cooling. The low-temperature nitrogen gas flowing out of the packed bed 9 then re-enters the cryogenic cooler 5, where it exchanges heat with pre-cooled air. The low-temperature nitrogen gas absorbs heat from the air, its temperature rises, and it partially vaporizes. After opening the heavy-duty sealing door 102, the working... The workpiece is placed on top of the workpiece placement assembly 3, then the heavy-duty sealing door 102 is closed, and the liquid nitrogen pump 201 is started. Liquid nitrogen is sprayed out from the spray head 203 at the bottom of the spray pipe 202. The liquid nitrogen comes into contact with the workpiece to achieve rapid low-temperature cooling. When the driven gear 303 rotates, it can drive the rotating disk 302 to rotate slowly through the connecting shaft. The surface of the rotating disk 302 is provided with a rubber pad to increase the friction between the workpiece and the rotating disk 302. The workpiece placed on the surface of the rotating disk 302 rotates with the rotating disk 302 under the action of friction.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cryogenic equipment cooling device, comprising a cooling chamber assembly (1), characterized in that: The input end of the cooling chamber assembly (1) is connected to a liquid nitrogen tank (11), and the input end of the liquid nitrogen tank (11) is connected to a distillation column (4). The input end of the distillation column (4) is connected to a cryostat (5), and the input end of the cryostat (5) is connected to a filter (8). The input end of the filter (8) is connected to a precooler (6), and the input end of the precooler (6) is connected to an air compressor (7). The output end of the cooling chamber assembly (1) is connected to a heat exchanger (10), and the output end of the heat exchanger (10) is connected to a packed bed (9). The interior of the cooling chamber assembly (1) is equipped with a liquid nitrogen spraying assembly (2), and a workpiece placement assembly (3) is provided below the liquid nitrogen spraying assembly (2).

2. The cryogenic equipment cooling device according to claim 1, characterized in that: The cooling chamber assembly (1) includes a cooling chamber (101), the front end of which is rotatably connected to a heavy-duty sealing door (102) via a hinge.

3. The cryogenic equipment cooling device according to claim 2, characterized in that: The liquid nitrogen spraying assembly (2) includes a spray pipe (202), and a liquid nitrogen pump (201) is installed at the connection between the spray pipe (202) and the liquid nitrogen tank (11).

4. The cryogenic equipment cooling device according to claim 3, characterized in that: The spray pipe (202) is provided with a support frame (204) on the outside, and the support frame (204) is welded to the inner wall of the cooling chamber (101). Multiple spray heads (203) are fixed at the bottom of the spray pipe (202).

5. The cryogenic equipment cooling device according to claim 4, characterized in that: The workpiece placement assembly (3) includes a low-temperature resistant base (301) fixed to the bottom of the cooling chamber (101). A rotating disk (302) is rotatably connected to the top of the low-temperature resistant base (301). A drive gear (304) is rotatably connected inside the low-temperature resistant base (301), and a driven gear (303) is meshed with the side of the drive gear (304).

6. The cryogenic equipment cooling device according to claim 5, characterized in that: A fan is connected between the heat exchanger (10) and the cryocooler (5) via a pipe.

7. A cryogenic equipment cooling device according to claim 6, characterized in that: The spraying direction of the spray head (203) is towards the rotating disk (302), and the spray head (203) is interconnected with the liquid nitrogen tank (11) through the spray pipe (202), the liquid nitrogen pump (201).

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