Refrigeration double-channel sleeve type low-temperature refrigeration house shelf calandria

Abstract

A refrigeration double-channel sleeve type low-temperature refrigeration house shelf calandria comprises sleeve units, a refrigeration supply and return channel I, a refrigeration supply and return channel II and a shelf body, and is characterized in that each sleeve unit comprises a sleeve, a U-shaped bent pipe I and a U-shaped bent pipe II, each sleeve comprises a COO outer pipe and a hot fluorine gas inner pipe, the sleeve units are all the sleeves, and the U-shaped bent pipe I and the U-shaped bent pipe II are connected with the COO outer pipe and the hot fluorine gas inner pipe. A preset number of sleeve units which are horizontally arranged at equal intervals form a sleeve assembly, each sleeve unit is arranged to be of a refrigeration double-channel structure, two COliquid supply collecting pipes are connected with a branch channel of a Y-shaped flow divider I through a pipeline I, two COair return collecting pipes are connected with a branch channel of a Y-shaped flow divider II through a pipeline II, all the pipelines are made of aluminum alloy materials, and the two COair return collecting pipes are connected with the branch channel of the Y-shaped flow divider II through a pipeline II. The frame body comprises a cross arm, a stand column and a pipe clamp, the stand column is composed of two steel channels and steel plate supporting legs at the lower end, the frame body is made of galvanized steel, and the problems that a sleeve combination in the shape of a regular octagon cannot be used, a refrigeration double-channel structure cannot be used, and a Y-shaped flow divider cannot be used are effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of freezing and refrigeration technology, and in particular to a dual-channel refrigeration sleeve-type low-temperature cold storage shelf arrangement. Background Technology

[0002] Low-temperature cold storage shelving pipes possess advantages such as excellent thermal conductivity, significant cooling effect, stable support, wide applicability, strong corrosion resistance, and energy saving. They have been widely used in industries and fields such as food, pharmaceuticals, and chemicals. With the development of the cold chain logistics industry, the application scope of aluminum shelving pipes is constantly expanding, providing efficient cold chain solutions for more industries. However, existing low-temperature cold storage shelving pipe technologies cannot utilize octagonal sleeve combinations, cannot guarantee the stability of placed goods, cannot effectively save pipe space, cannot achieve uniformity and simple installation, cannot use a dual-path refrigeration structure, cannot reduce refrigerant circulation efficiency and ratio, cannot reduce refrigerant charge, cannot use Y-type distributors, cannot use a single liquid supply pipe to control the flow direction and flow rate of the dual-path refrigeration shelving pipe, and cannot use a single return gas pipe to control the return flow of the dual-path refrigeration shelving pipe back to the unit.

[0003] The invention patent with patent number ZL202410830412.1 discloses a "cold storage room". This invention relates to the technical field of product freezing and preservation. It includes a storage room body and a refrigeration unit. The internal cavity of the storage room body is provided with several display racks. Each of the display racks is provided with a shelf pipe connected to the output end of the refrigeration unit and used for refrigeration. There are several shelf pipes. The display trays are arranged between the shelf pipes. Goods are placed in the display trays. The shelf pipes are used to refrigerate the goods in the display trays. This invention can effectively reduce the deviation value around the display racks at different positions. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a dual-channel refrigeration sleeve-type low-temperature cold storage shelf arrangement, equipped with a sleeve unit, refrigeration supply and return channel I, refrigeration supply and return channel II, and a Y-type distributor. This ensures the stability of placed goods, effectively saves piping space, achieves neatness and ease of installation, reduces refrigerant circulation efficiency and ratio, and reduces refrigerant charge. A single liquid supply pipe controls the flow direction and flow rate of the dual-channel refrigeration shelf arrangement, and a single return gas pipe controls the return flow of the dual-channel refrigeration shelf arrangement back to the unit, effectively solving the aforementioned technical problems.

[0005] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is as follows:

[0006] The aforementioned dual-channel sleeve-type low-temperature cold storage rack and pipe system includes a sleeve unit, a refrigeration supply and return channel I, a refrigeration supply and return channel II, and a frame, characterized in that...

[0007] The sleeve unit includes a sleeve, U-shaped bend I, and U-shaped bend II. The sleeve includes a CO2 outer tube and a hot fluorine gas inner tube. The hot fluorine gas inner tube is sleeved inside the CO2 outer tube. An inner bend I of the same shape and length is sleeved inside the U-shaped bend I. An inner bend II of the same shape and length is sleeved inside the U-shaped bend II. A predetermined number of sleeve units arranged horizontally at equal intervals constitute a sleeve assembly. The sleeve assembly is configured as a cuboid structure.

[0008] The sleeve unit is provided with 12 sleeves, 7 U-shaped bends I and 3 U-shaped bends II arranged in a horizontal order on the same vertical plane. The sleeve unit is configured as a dual-passage cooling structure. The 6 sleeves in the lower half of the sleeve unit are configured as cooling supply and return passage I, and the 6 sleeves in the upper half of the sleeve unit are configured as cooling supply and return passage II.

[0009] The frame includes crossbeams, uprights, and pipe clamps. The frame is designed as a cuboid structure. Both the front and rear ends of the frame are equipped with a predetermined number of equally spaced uprights. The spacing between the uprights at the left and right ends of the frame matches the length of the sleeve. Each upright consists of two vertically arranged channel steels of equal length and steel plate legs located at the lower ends of the two channel steels. Twelve crossbeams are fixedly installed on the two corresponding uprights at the front and rear ends. The positions of the crossbeams match the positions of the corresponding sleeves. The sleeves are fixed to the corresponding crossbeams by pipe clamps. The crossbeams, pipe clamps, channel steels, and steel plate legs are all made of galvanized steel.

[0010] The outer wall of the CO2 pipe has a regular octagonal cross-section. The inner diameter of the CO2 outer pipe is 32 mm. The inner diameter of the hot fluorine gas inner pipe is 16 mm and the wall thickness is 1.7 mm. The diameters of U-shaped bends I and II are equal to those of the CO2 outer pipe. The hot fluorine gas inner pipe, inner bend I, and inner bend II are pipes with equal diameters and wall thicknesses.

[0011] The right ends of adjacent sleeves in the eight sleeves from bottom to top are connected in pairs by U-shaped bends I. The right ends of adjacent sleeves in the four sleeves from top to bottom are connected in pairs by U-shaped bends II. The left ends of the second and third sleeves from bottom to top are connected by U-shaped bends I, the left ends of the fourth and fifth sleeves are connected by U-shaped bends I, the left ends of the eighth and ninth sleeves are connected by U-shaped bends I, and the left ends of the tenth and eleventh sleeves are connected by U-shaped bends II. The port of the hot fluorine gas inner tube is sealed to the corresponding port of the inner bend I by a seamless welding method. The port of the CO2 outer tube is sealed to the corresponding port of the U-shaped bend I by a seamless welding method. The port of the hot fluorine gas inner tube is sealed to the corresponding port of the inner bend II by a seamless welding method. The port of the CO2 outer tube is sealed to the corresponding port of the U-shaped bend II by a seamless welding method.

[0012] It also includes a supply and return assembly, which consists of six types of manifolds from bottom to top: hot fluorine gas return manifold, CO2 liquid supply manifold I, CO2 gas return manifold I, CO2 liquid supply manifold II, CO2 gas return manifold II, and hot fluorine gas inlet manifold. The supply and return assembly is located at the left end of the sleeve assembly, and all the manifolds are located on the same vertical plane and are perpendicular to the sleeve.

[0013] The hot fluorine gas return manifold is connected to the left end of the hot fluorine gas inner tube of the first sleeve by means of seamless welding through a bend. A through hole is opened at a preset position on the left end of the CO2 outer tube. The size of the through hole matches the size of the outer diameter of the bend. The bend is sealed and fixed to the through hole by means of seamless welding.

[0014] The CO2 supply manifold I is located above the hot fluorine gas return manifold. The center of the axis of the CO2 supply manifold I is on the same horizontal plane as the center of the axis of the first sleeve. The CO2 supply manifold I is connected to the left end of the CO2 outer tube of the first sleeve by a short pipe I in a seamless welding manner.

[0015] The center of the axis of the CO2 return manifold I is on the same horizontal plane as the center of the axis of the sixth sleeve. The CO2 return manifold I is connected to the left end of the CO2 outer tube of the sixth sleeve by a short pipe I in a seamless welding manner.

[0016] The center of the axis of the CO2 supply manifold II is on the same horizontal plane as the center of the axis of the seventh sleeve. The CO2 supply manifold II is connected to the left end of the CO2 outer tube of the seventh sleeve by short pipe I in a seamless welding manner.

[0017] The center of the axis of the CO2 return gas manifold II is on the same horizontal plane as the center of the axis of the twelfth sleeve. The CO2 return gas manifold II is connected to the left end of the CO2 outer pipe of the twelfth sleeve by short pipe I in a seamless welding manner.

[0018] The hot fluorine gas inlet manifold is located above the CO2 return manifold II. The hot fluorine gas inlet manifold is connected to the left end of the hot fluorine gas inner tube of the twelfth sleeve by means of seamless welding through a bend. A through hole is opened at a predetermined position on the left end of the CO2 outer tube. The size of the through hole matches the size of the outer diameter of the bend. The bend is sealed and fixed to the through hole by means of seamless welding.

[0019] The middle positions on the left side of the CO2 liquid supply manifold I, CO2 return manifold I, CO2 liquid supply manifold II, and CO2 return manifold II are respectively connected to flanges via short pipe II. The left end of the hot fluorine gas inner pipe of the sixth and seventh sleeves is connected to the vertical pipe by seamless welding. A through hole is opened at a predetermined position on the left end of the CO2 outer pipe of the sixth and seventh sleeves. The size of the through hole matches the size of the outer diameter of the vertical pipe. The vertical pipe is sealed and fixed to the through hole by seamless welding.

[0020] The diameter of the short pipe I is equal to that of the CO2 outer pipe, and the hot fluorine gas inner pipe, bend, and vertical pipe are configured as pipes with equal diameter and wall thickness.

[0021] The flanges of CO2 supply manifold I and CO2 supply manifold II are respectively connected to the branch channels of Y-type splitter I through pipe I. The main channel of Y-type splitter I is connected to the supply pipe of external unit through pipe. The flanges of CO2 return manifold I and CO2 return manifold II are respectively connected to the branch channels of Y-type splitter II through pipe II. The main channel of Y-type splitter II is connected to the return pipe of external unit through pipe III.

[0022] The CO2 outer pipe is supplied with a tank pump. A dryness sensor is fixedly installed on the pipe III to measure the dryness of the gas in the pipe III. By using the tank pump and the dryness sensor in combination, the amount of CO2 filling the outer pipe can be reduced, full liquid evaporation can be ensured, and uneven liquid distribution can be avoided.

[0023] A shelf layer is formed between two adjacent horizontal sleeves. The sleeve assembly is configured from bottom to top as a storage shelf layer and a cooling shelf layer. The number of storage shelf layers is set to 8. The storage shelf layer is used to place storage trays. The sleeve at the lower end of the storage shelf layer is used to support the weight, so as to achieve the purpose of direct contact cooling.

[0024] U-shaped bend I, U-shaped bend II, CO2 outer pipe, hot fluorine gas inner pipe, inner bend I, inner bend II, hot fluorine gas return manifold, CO2 supply manifold I, CO2 return manifold I, CO2 supply manifold II, CO2 return manifold II, hot fluorine gas inlet manifold, bend, short pipe I, short pipe II, vertical pipe, pipe I, pipe II, pipe III and storage tray are all made of aluminum alloy.

[0025] The beneficial effects of this utility model are:

[0026] This utility model is equipped with a sleeve unit, as well as corresponding sleeves, U-shaped bends I and II, etc., which can ensure the stability of the placed goods, effectively save the space occupied by the pipeline, achieve neatness and uniformity and simple installation. It effectively solves the problems that the sleeve combination with a regular octagonal shape cannot be used, which cannot guarantee the stability of the placed goods, cannot effectively save the space occupied by the pipeline, and cannot achieve neatness and uniformity and simple installation.

[0027] This utility model is provided with a refrigeration supply and return passage I and a refrigeration supply and return passage II, as well as corresponding CO2 liquid supply manifold I, CO2 gas return manifold I, CO2 liquid supply manifold II and CO2 gas return manifold II, etc., which can reduce the circulation efficiency and ratio of the refrigerant and reduce the amount of refrigerant charged. It effectively solves the problems that the dual-pass structure of refrigeration cannot be used, and that it is impossible to reduce the circulation efficiency and ratio of the refrigerant and reduce the amount of refrigerant charged.

[0028] This utility model is equipped with Y-type flow dividers I and II, as well as corresponding pipes I, II, III, and IV. It enables the use of a single liquid supply pipe to control the flow direction and flow rate of the dual-path refrigeration rack pipes, and a single return gas pipe to control the flow of the dual-path refrigeration rack pipes back to the unit. This effectively solves the problems of not being able to use Y-type flow dividers, not being able to use a single liquid supply pipe to control the flow direction and flow rate of the dual-path refrigeration rack pipes, and not being able to use a single return gas pipe to control the flow of the dual-path refrigeration rack pipes back to the unit. Attached Figure Description

[0029] Appendix Figure 1 This is a front view structural diagram of the present invention;

[0030] Appendix Figure 2 This is a top view of the structure of this utility model;

[0031] Appendix Figure 3 This is a schematic diagram of the right-side cross-sectional structure of this utility model;

[0032] Appendix Figure 4 This is a structural schematic diagram of the vertical cross-section of the sleeve unit of this utility model.

[0033] Legend:

[0034] 1. Sleeve unit, 2. Refrigeration supply and return passage I, 3. Refrigeration supply and return passage II, 4. Frame, 5. Sleeve, 6. U-bend I, 7. U-bend II, 8. CO2 outer pipe, 9. Hot fluorine gas inner pipe, 10. Inner bend I, 11. Inner bend II, 12. Sleeve assembly, 13. Crossbeam, 14. Column, 15. Channel steel, 16. Steel plate support leg, 17. Pipe clamp, 18. Supply and return assembly, 19. Hot fluorine gas return manifold, 20. CO2 supply manifold Ⅰ, 21. CO2 return manifold Ⅰ, 22. CO2 supply manifold Ⅱ, 23. CO2 return manifold Ⅱ, 24. Hot fluorine gas inlet manifold, 25. Bend, 26. Short pipe Ⅰ, 27. Short pipe Ⅱ, 28. Flange, 29. Vertical pipe, 30. Pipe Ⅰ, 31. Y-type distributor Ⅰ, 32. Pipe Ⅱ, 33. Y-type distributor Ⅱ, 34. Pipe Ⅲ, 35. Dryness sensor, 36. Shelf layer, 37. Storage shelf layer, 38. Cooling shelf layer. Detailed Implementation

[0035] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 The present invention will be further described in detail with reference to the embodiments, so that the public can better understand the implementation method of the present invention. The specific implementation method of the present invention is as follows:

[0036] The aforementioned dual-channel sleeve-type low-temperature cold storage shelf assembly includes a sleeve unit 1, a refrigeration supply and return channel I 2, a refrigeration supply and return channel II 3, and a frame 4, characterized in that...

[0037] The sleeve unit 1 includes a sleeve 5, a U-shaped bend I 6, and a U-shaped bend II 7. The sleeve 5 includes a CO2 outer tube 8 and a hot fluorine gas inner tube 9. The hot fluorine gas inner tube 9 is sleeved inside the CO2 outer tube 8. The U-shaped bend I 6 is sleeved inside an inner bend I 10 of the same shape and length. The U-shaped bend II 7 is sleeved inside an inner bend II 11 of the same shape and length. A predetermined number of sleeve units 1 arranged horizontally at equal intervals constitute a sleeve assembly 12. The sleeve assembly 12 is configured as a cuboid structure.

[0038] The sleeve unit 1 is provided with twelve sleeves 5, seven U-shaped bends I 6 and three U-shaped bends II 7 arranged horizontally in the same vertical plane. The sleeve unit 1 is configured as a dual-passage refrigeration structure, which can reduce the circulation efficiency and ratio of the refrigerant and reduce the amount of refrigerant charged. The six sleeves 5 in the lower half of the sleeve unit 1 are configured as refrigeration supply and return passage I 2, and the six sleeves 5 in the upper half of the sleeve unit 1 are configured as refrigeration supply and return passage II 3.

[0039] The frame 4 includes crossbeams 13, uprights 14, and pipe clamps 17. The frame 4 is configured as a cuboid structure. Both the front and rear ends of the frame 4 are provided with a predetermined number of equally spaced uprights 14. The spacing between the uprights 14 at the left and right ends of the frame 4 matches the length of the sleeve 5. Each upright 14 consists of two vertically arranged channel steels 15 of equal length and steel plate legs 16 located at the lower ends of the two channel steels 15. Twelve crossbeams 13 are fixedly installed on the two corresponding uprights 14 at the front and rear. The position of the crossbeams 13 matches the position of the corresponding sleeve 5. The sleeve 5 is fixed to the corresponding crossbeam 13 by pipe clamps 17. The crossbeams 13, pipe clamps 17, channel steels 15, and steel plate legs 16 are all made of galvanized steel.

[0040] The outer wall cross-section of the CO2 outer pipe 8 is set as a regular octagonal structure. The inner diameter of the CO2 outer pipe 8 is set as 32mm. The inner diameter of the hot fluorine gas inner pipe 9 is set as 16mm, and the wall thickness is set as 1.7mm. The diameters of the U-shaped bends I and II are equal to the diameter of the CO2 outer pipe 8. The hot fluorine gas inner pipe 9, inner bends I and II are set as pipes with equal diameters and wall thicknesses. The sleeve 5, U-shaped bends I and II are all set as sleeve combinations. The outer wall of the CO2 outer pipe 8 is set as a regular octagonal structure to ensure the stability of the placed goods, effectively save the space occupied by the pipes, and achieve neatness and simple installation.

[0041] The right ends of adjacent sleeves 5 from bottom to top are connected in pairs by U-shaped bends I and 6. The right ends of adjacent sleeves 5 from top to bottom are connected in pairs by U-shaped bends II and 7. The left ends of the second and third sleeves 5 from bottom to top are connected by U-shaped bends I and 6. The left ends of the fourth and fifth sleeves 5 are connected by U-shaped bends I and 6. The left ends of the eighth and ninth sleeves 5 are connected by U-shaped bends I and 7. The left end of the tenth sleeve 5 and... The left end of the eleventh sleeve 5 is connected to the U-shaped bend II 7. The port of the hot fluorine gas inner tube 9 is sealed to the corresponding port of the inner bend I 10 by a non-marking weld. The port of the CO2 outer tube 8 is sealed to the corresponding port of the U-shaped bend I 6 by a non-marking weld. The port of the hot fluorine gas inner tube 9 is sealed to the corresponding port of the inner bend II 11 by a non-marking weld. The port of the CO2 outer tube 8 is sealed to the corresponding port of the U-shaped bend II 7 by a non-marking weld.

[0042] It also includes a supply and return assembly 18, which, from bottom to top, includes six types of manifolds: a hot fluorine gas return manifold 19, a CO2 supply manifold I 20, a CO2 return gas manifold I 21, a CO2 supply manifold II 22, a CO2 return gas manifold II 23, and a hot fluorine gas inlet manifold 24. The supply and return assembly 18 is located at the left end of the sleeve assembly 12, and all the manifolds are located on the same vertical plane and are perpendicular to the sleeve 5.

[0043] The hot fluorine gas return manifold 19 is connected to the left end of the hot fluorine gas inner tube 9 of the first sleeve 5 by means of seamless welding through the bend 25. A through hole is opened at a preset position on the left end of the CO2 outer tube 8. The size of the through hole matches the size of the outer diameter of the bend 25. The bend 25 is sealed and fixed to the through hole by means of seamless welding.

[0044] The CO2 supply manifold I20 is positioned above the hot fluorine gas return manifold 19. The center of the axis of the CO2 supply manifold I20 is on the same horizontal plane as the center of the axis of the first sleeve 5. The CO2 supply manifold I20 is connected to the left end of the CO2 outer tube 8 of the first sleeve 5 by a short pipe I26 in a seamless welding manner.

[0045] The center of the axis of the CO2 return manifold I21 is on the same horizontal plane as the center of the axis of the sixth sleeve 5. The CO2 return manifold I21 is connected to the left end of the CO2 outer pipe 8 of the sixth sleeve 5 by a short pipe I26 in a seamless welding manner.

[0046] The center of the axis of the CO2 supply manifold II 22 is on the same horizontal plane as the center of the axis of the seventh sleeve 5. The CO2 supply manifold II 22 is connected to the left end of the CO2 outer tube 8 of the seventh sleeve 5 by a short tube I 26 in a seamless welding manner.

[0047] The center of the axis of the CO2 return gas manifold II 23 is on the same horizontal plane as the center of the axis of the twelfth sleeve 5. The CO2 return gas manifold II 23 is connected to the left end of the CO2 outer pipe 8 of the twelfth sleeve (5) by a short pipe I 26 in a seamless welding manner.

[0048] The hot fluorine gas inlet manifold 24 is located above the CO2 return manifold II 23. The hot fluorine gas inlet manifold 24 is connected to the left end of the hot fluorine gas inner pipe 9 of the twelfth sleeve 5 by means of seamless welding through the bend 25. A through hole is opened at a preset position on the left end of the CO2 outer pipe 8. The size of the through hole matches the size of the outer diameter of the bend 25. The bend 25 is sealed and fixed to the through hole by means of seamless welding.

[0049] The middle positions on the left side of the CO2 liquid supply manifold I20, CO2 return manifold I21, CO2 liquid supply manifold II22, and CO2 return manifold II23 are respectively connected to flanges 28 via short pipes II27. The left end of the hot fluorine gas inner pipe 9 of the sixth and seventh sleeves 5 is connected to the vertical pipe 29 by seamless welding. A through hole is opened at a predetermined position on the left end of the CO2 outer pipe 8 of the sixth and seventh sleeves 5. The size of the through hole matches the size of the outer diameter of the vertical pipe 29. The vertical pipe 29 is sealed and fixed to the through hole by seamless welding.

[0050] The diameter of the short pipe I26 is equal to that of the CO2 outer pipe 8, and the hot fluorine gas inner pipe 9, the bend 25 and the vertical pipe 29 are configured as pipes with equal diameter and wall thickness.

[0051] The flanges 28 of the CO2 supply manifold I 20 and CO2 supply manifold II 22 are respectively connected to the branch channels of the Y-type splitter I 31 through pipe I 30. The main channel of the Y-type splitter I 31 is connected to the supply pipe of the external unit through pipe. The flanges 28 of the CO2 return manifold I 21 and CO2 return manifold II 23 are respectively connected to the branch channels of the Y-type splitter II 33 through pipe II 32. The main channel of the Y-type splitter II 33 is connected to the return pipe of the external unit through pipe III 34.

[0052] The liquid supply method of the CO2 outer pipe 8 is set as a barrel pump liquid supply structure. A dryness sensor 35 is fixedly installed on the pipe Ⅲ34. The dryness sensor 35 is used to measure the dryness of the gas in the pipe Ⅲ34. By using the barrel pump liquid supply structure and the dryness sensor 35 together, the purpose of reducing the filling amount of CO2 outer pipe 8, ensuring full liquid evaporation, and avoiding uneven liquid distribution can be achieved.

[0053] A shelf layer 36 is formed between two adjacent horizontal sleeves 5. The sleeve assembly 12 is configured from bottom to top as a storage shelf layer 37 and a cooling shelf layer 38. The number of storage shelf layers 37 is set to eight. The storage shelf layer 37 is used to place a storage tray. The sleeve 5 at the lower end of the storage shelf layer 37 is used to support the weight, so as to achieve the purpose of direct contact cooling.

[0054] U-shaped bend I (6), U-shaped bend II (7), CO2 outer pipe (8), hot fluorine gas inner pipe (9), inner bend I (10), inner bend II (11), hot fluorine gas return manifold (19), CO2 supply manifold I (20), CO2 return manifold I (21), CO2 supply manifold II (22), CO2 return manifold II (23), hot fluorine gas inlet manifold (24), bend (25), short pipe I (26), short pipe II (27), vertical pipe (29), pipe I (30), pipe II (32), pipe III (34), and the storage tray are all made of aluminum alloy.

[0055] The working principle and process of this utility model are as follows: Specific Implementation Example 1:

[0056] A certain low-temperature cold storage uses the aforementioned dual-channel coaxial low-temperature cold storage rack and pipe system. First, check that all equipment and pipes are normal and securely connected. Open the liquid supply pipe valve and return gas pipe valve of the external unit, and close the external valves connected to the hot fluorine gas inlet manifold 24 and the hot fluorine gas return liquid manifold 19. Low-temperature CO2 liquid is supplied by a tank pump and controlled by Y-type distributor I31. Through flange 28, the low-temperature CO2 liquid is evenly distributed to CO2 liquid supply manifold I20 and CO2 liquid supply manifold II22, respectively, and enters the CO2 outer pipe 8. After exchanging heat and cold with the air in the cold storage, the low-temperature CO2 liquid becomes CO2 gas and flows out through CO2 return gas manifold I21 and CO2 return gas manifold II23, respectively. After passing through flange 28 and controlled by Y-type distributor II33, the flow is collected and returned to the external unit. After gas-liquid separation, it is sucked away by the compressor. This cycle repeats, which is the refrigeration operation step of the aforementioned dual-channel coaxial low-temperature cold storage rack and pipe system.

[0057] The aforementioned dual-channel refrigeration sleeve-type low-temperature cold storage rack and pipe arrangement is designed with a dual-channel refrigeration structure, which can reduce the circulation efficiency and ratio of the refrigerant and reduce the amount of refrigerant charged. The Y-type splitter I31 and Y-type splitter II33 can control the flow direction and flow rate of the dual-channel refrigeration rack and pipe arrangement using a single liquid supply pipe and control the return flow of the dual-channel refrigeration rack and pipe arrangement to the unit using a single return gas pipe. The combination design of the octagonal sleeve 5, U-shaped bend I6 and U-shaped bend II7 can ensure the stability of the placed goods, effectively save the space occupied by the pipes, and achieve neatness and simple installation.

[0058] The dryness sensor 35, fixedly installed on pipe Ⅲ34, can measure the dryness of the gas in CO2 return manifold Ⅰ21 and CO2 return manifold Ⅱ23. By using the pump supply structure and the dryness sensor 35 in combination, the purpose of reducing the amount of CO2 filling in the outer pipe 8 can be achieved, ensuring full liquid evaporation and avoiding uneven liquid distribution. The dual-channel refrigeration sleeve-type low-temperature cold storage shelf arrangement is set as a dual-channel refrigeration structure with 8 layers from bottom to top as shelf layers 37 for placing storage trays, achieving direct contact refrigeration, high heat transfer efficiency, and uniform and stable temperature. Specific Implementation Example 2:

[0059] Close the liquid supply pipe valve of the external unit, and slowly close the return gas pipe valve after a delay of 3-5 minutes. Evacuate the CO2 refrigerant in the CO2 outer pipe 8 as much as possible. Slowly open the external valve connected to the hot fluorine gas inlet manifold 24. The hot fluorine gas enters the hot fluorine gas inner pipe 9 through the hot fluorine gas inlet manifold 24. After heat exchange between the hot fluorine gas and the CO2 outer pipe 8, the frost layer falls off from the CO2 outer pipe 8. Slowly open the external valve connected to the hot fluorine gas return liquid manifold 19 after a delay. The high-temperature hot fluorine gas becomes a low-temperature liquid and is discharged to the drain tank through the hot fluorine gas return liquid manifold 19 until defrosting is complete. Then, restart the refrigeration process according to the steps in Specific Embodiment 1.

[0060] The frame 4, consisting of crossbeam 13, upright column 14 and pipe clamp 17, has the advantages of simple design, stable support and firm clamping, which greatly reduces the load on the sleeve 5. The frame 4 is made of galvanized steel, which greatly improves the high strength, aesthetics, corrosion resistance and durability of the frame 4.

Claims

1. A dual-channel refrigeration sleeve-type low-temperature cold storage rack and pipe system, comprising a sleeve unit (1), a refrigeration supply and return channel I (2), a refrigeration supply and return channel II (3), and a frame (4), characterized in that, The sleeve unit (1) includes a sleeve (5), a U-shaped bend I (6) and a U-shaped bend II (7). The sleeve (5) includes a CO2 outer tube (8) and a hot fluorine gas inner tube (9). The hot fluorine gas inner tube (9) is sleeved inside the CO2 outer tube (8). The U-shaped bend I (6) is sleeved inside an inner bend I (10) of the same shape and length. The U-shaped bend II (7) is sleeved inside an inner bend II (11) of the same shape and length. A predetermined number of sleeve units (1) arranged horizontally at equal intervals constitute a sleeve assembly (12). The sleeve assembly (12) is set as a cuboid structure. The sleeve unit (1) is provided with 12 sleeves (5) arranged horizontally in the same vertical plane, 7 U-shaped bends I (6) and 3 U-shaped bends II (7). The sleeve unit (1) is configured as a dual-passage cooling structure. The 6 sleeves (5) in the lower half of the sleeve unit (1) are configured as cooling supply and return passage I (2), and the 6 sleeves (5) in the upper half of the sleeve unit (1) are configured as cooling supply and return passage II (3). The frame (4) includes crossbeams (13), columns (14) and pipe clamps (17). The frame (4) is a rectangular structure. The front and rear ends of the frame (4) are provided with a preset number of columns (14) arranged at equal intervals. The spacing between the columns (14) at the left and right ends of the frame (4) matches the length of the sleeve (5). The column (14) is composed of two vertically arranged channel steels (15) of equal length and steel plate legs (16) set at the lower end of the two channel steels (15). The two corresponding columns (14) at the front and rear are fixedly provided with 12 crossbeams (13). The position of the crossbeams (13) matches the position of the corresponding sleeve (5). The sleeve (5) is fixed on the corresponding crossbeam (13) by pipe clamps (17). The crossbeams (13), pipe clamps (17), channel steels (15) and steel plate legs (16) are all made of galvanized steel.

2. The dual-channel sleeve-type low-temperature cold storage shelf arrangement as described in claim 1, characterized in that, The outer cross-section of the CO2 outer pipe (8) is set as a regular octagonal structure. The inner diameter of the CO2 outer pipe (8) is set as 32mm. The inner diameter of the hot fluorine gas inner pipe (9) is set as 16mm and the wall thickness is set as 1.7mm. The pipe diameters of the U-shaped bend I (6) and U-shaped bend II (7) are equal to the pipe diameters of the CO2 outer pipe (8). The hot fluorine gas inner pipe (9), inner bend I (10) and inner bend II (11) are set as pipes with equal pipe diameters and wall thicknesses.

3. The dual-channel sleeve-type low-temperature cold storage shelf arrangement as described in claim 1, characterized in that, The right ends of adjacent sleeves (5) in the eight sleeves (5) from bottom to top are connected in pairs by U-shaped bend I (6). The right ends of adjacent sleeves (5) in the four sleeves (5) from top to bottom are connected in pairs by U-shaped bend II (7). The left ends of the second sleeve (5) and the third sleeve (5) from bottom to top are connected by U-shaped bend I (6). The left ends of the fourth sleeve (5) and the fifth sleeve (5) are connected by U-shaped bend I (6). The left ends of the eighth sleeve (5) and the ninth sleeve (5) are connected by U-shaped bend I (6). The tenth sleeve... (5) The left end and the left end of the eleventh sleeve (5) are connected by U-shaped bend II (7). The port of the hot fluorine gas inner tube (9) is sealed to the port of the corresponding inner bend I (10) by a non-marking welding method. The port of the CO2 outer tube (8) is sealed to the port of the corresponding U-shaped bend I (6) by a non-marking welding method. The port of the hot fluorine gas inner tube (9) is sealed to the port of the corresponding inner bend II (11) by a non-marking welding method. The port of the CO2 outer tube (8) is sealed to the port of the corresponding U-shaped bend II (7) by a non-marking welding method.

4. The dual-channel sleeve-type low-temperature cold storage shelf arrangement as described in claim 1, characterized in that, It also includes a supply and return assembly (18), which includes six types of manifolds from bottom to top: hot fluorine gas return manifold (19), CO2 supply manifold I (20), CO2 return gas manifold I (21), CO2 supply manifold II (22), CO2 return gas manifold II (23) and hot fluorine gas inlet manifold (24). The supply and return assembly (18) is located at the left end of the sleeve assembly (12). All manifolds are located on the same vertical plane and are perpendicular to the sleeve (5). The hot fluorine gas return manifold (19) is connected to the left end of the hot fluorine gas inner tube (9) of the first sleeve (5) by means of seamless welding through the bend (25). A through hole is provided at the preset position on the left end of the CO2 outer tube (8). The size of the through hole matches the size of the outer diameter of the bend (25). The bend (25) is sealed and fixed to the through hole by means of seamless welding. The CO2 supply manifold I (20) is located above the hot fluorine gas return manifold (19). The center of the axis of the CO2 supply manifold I (20) is on the same horizontal plane as the center of the axis of the first sleeve (5). The CO2 supply manifold I (20) is connected to the left end of the CO2 outer tube (8) of the first sleeve (5) by means of seamless welding through the short tube I (26). The center of the axis of the CO2 return gas manifold I (21) is on the same horizontal plane as the center of the axis of the sixth sleeve (5). The CO2 return gas manifold I (21) is connected to the left end of the CO2 outer pipe (8) of the sixth sleeve (5) by a short pipe I (26) in a seamless welding manner. The center of the axis of the CO2 supply manifold II (22) is on the same horizontal plane as the center of the axis of the seventh sleeve (5). The CO2 supply manifold II (22) is connected to the left end of the CO2 outer tube (8) of the seventh sleeve (5) by a short tube I (26) in a seamless welding manner. The center of the axis of the CO2 return gas manifold II (23) is on the same horizontal plane as the center of the axis of the twelfth sleeve (5). The CO2 return gas manifold II (23) is connected to the left end of the CO2 outer pipe (8) of the twelfth sleeve (5) by a short pipe I (26) in a seamless welding manner. The hot fluorine gas inlet manifold (24) is located above the CO2 return manifold II (23). The hot fluorine gas inlet manifold (24) is connected to the left end of the hot fluorine gas inner tube (9) of the twelfth sleeve (5) by means of seamless welding through the bend (25). A through hole is provided at the preset position on the left end of the CO2 outer tube (8). The size of the through hole matches the size of the outer diameter of the bend (25). The bend (25) is sealed and fixed to the through hole by means of seamless welding. The middle positions on the left side of the CO2 supply manifold I (20), CO2 return manifold I (21), CO2 supply manifold II (22) and CO2 return manifold II (23) are respectively connected to flanges (28) through short pipes II (27). The left end of the hot fluorine gas inner pipe (9) of the sixth and seventh sleeves (5) is connected to the vertical pipe (29) by a seamless welding method. A through hole is opened at the preset position on the left end of the CO2 outer pipe (8) of the sixth and seventh sleeves (5). The size of the through hole matches the size of the outer diameter of the vertical pipe (29). The vertical pipe (29) is sealed and fixed to the through hole by a seamless welding method. The diameter of the short pipe I (26) is equal to that of the CO2 outer pipe (8), and the hot fluorine gas inner pipe (9), the bend (25) and the vertical pipe (29) are configured as pipes with equal diameter and wall thickness.

5. The dual-channel sleeve-type low-temperature cold storage shelf arrangement as described in claim 4, characterized in that, The flanges (28) of the CO2 supply manifold I (20) and CO2 supply manifold II (22) are respectively connected to the branch channels of Y-type splitter I (31) through pipe I (30). The main channel of Y-type splitter I (31) is connected to the supply pipe of the external unit through pipe. The flanges (28) of the CO2 return manifold I (21) and CO2 return manifold II (23) are respectively connected to the branch channels of Y-type splitter II (33) through pipe II (32). The main channel of Y-type splitter II (33) is connected to the return pipe of the external unit through pipe III (34).

6. The dual-channel sleeve-type low-temperature cold storage shelf arrangement as described in claim 1, characterized in that, The CO2 outer pipe (8) is configured to supply liquid via a barrel pump.

7. The dual-channel sleeve-type low-temperature cold storage shelf arrangement as described in claim 5, characterized in that, A dryness sensor (35) is fixedly installed on the pipe III (34). The dryness sensor (35) is used to measure the dryness of the gas in the pipe III (34). By using the pump supply structure and the dryness sensor (35) together, the purpose of reducing the filling amount of CO2 outer pipe (8), ensuring full liquid evaporation, and avoiding uneven liquid distribution can be achieved.

8. The dual-channel sleeve-type low-temperature cold storage shelf arrangement as described in claim 4, characterized in that, A shelf layer (36) is formed between two adjacent horizontal sleeves (5). The sleeve assembly (12) is configured from bottom to top as a storage shelf layer (37) and a cooling shelf layer (38). The number of storage shelf layers (37) is set to 8 layers. The storage shelf layer (37) is used to place a storage tray. The sleeve (5) at the lower end of the storage shelf layer (37) is used to bear the weight, so as to achieve the purpose of direct contact cooling.

9. A dual-channel sleeve-type low-temperature cold storage shelf arrangement as described in claim 8, characterized in that, U-shaped bend I (6), U-shaped bend II (7), CO2 outer pipe (8), hot fluorine gas inner pipe (9), inner bend I (10), inner bend II (11), hot fluorine gas return manifold (19), CO2 supply manifold I (20), CO2 return manifold I (21), CO2 supply manifold II (22), CO2 return manifold II (23), hot fluorine gas inlet manifold (24), bend (25), short pipe I (26), short pipe II (27), vertical pipe (29), pipe I (30), pipe II (32), pipe III (34) and the storage tray are all made of aluminum alloy.

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