Novel low-temperature cold storage top calandria

Abstract

A novel top calandria of a low-temperature refrigeration house comprises a hanging bar, a cross arm, a dryness sensor and a double-pipe top calandria assembly, and is characterized in that the double-pipe top calandria assembly comprises a COpipe, a hot fluorine gas pipe and fins, and the left end and the right end of the double-pipe top calandria assembly are provided with an air inlet and return assembly and a liquid supply and return assembly respectively; the double-pipe top calandria assembly, the air inlet and return assembly and the liquid supply and return assembly are arranged to be of an integrated structure, the preset number of cross arms are axially and vertically arranged on the lower side of the double-pipe top calandria assembly, the upper ends of the hanging bars are fixedly arranged at the upper end of a refrigeration house roof bearing structure, the hanging rods fix the cross arms, and the cross arms clamp the double-pipe top calandria assembly through plastic supports. A dryness sensor is arranged on the COreturn gas collecting pipe; and the COliquid supply collecting pipe, the COreturn gas collecting pipe, the hot fluorine gas inlet collecting pipe and the hot fluorine gas return collecting pipe are respectively connected with a liquid supply valve, a gas return valve, a hot gas valve and a pressure drain valve through steel aluminum joints. The problems that a hanging bar, a dryness sensor and a steel-aluminum connector cannot be used are effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of refrigeration and cold storage, especially to a novel low-temperature cold storage roof pipe. BACKGROUND

[0002] In practical application, the aluminum alloy roof pipe can quickly cool down, reduce the operation time of the compressor, greatly save the electric energy, and has the advantages of convenient installation, good heat conduction performance, strong safety performance, good energy-saving effect and the like, so that it is widely used in cold storage engineering, and the safety and efficient operation of the cold storage are ensured. However, the aluminum alloy roof pipe of the prior art cannot use the lifting rib, cannot transmit the overall weight of the aluminum alloy roof pipe to the cold storage roof bearing structure, cannot use the dryness sensor, cannot measure the gas dryness in the CO2 return gas header, cannot reduce the filling amount of the CO2 pipe, ensure full liquid evaporation and avoid uneven liquid distribution, and cannot use the steel-aluminum joint, which cannot ensure the strength and rigidity of the steel at the interface, and cannot meet the light weight and corrosion resistance of the aluminum and the like.

[0003] The patent No. ZL202121605711.3 discloses a "novel double-system roof pipe", which comprises a roof pipe, the roof pipe comprises a cooling pipe, a defrosting pipe, large fins and small fins, the cooling pipe and the defrosting pipe are arranged in parallel with each other, two groups of large fins are arranged on the cooling pipe in opposite positions, one group of large fins is connected with the side wall of the defrosting pipe, and small fins are arranged on the opposite side walls of the defrosting pipe. By arranging the cooling pipe and the defrosting pipe, a double-system pipe is formed, which reduces the influence on the composition of the refrigerant medium during defrosting; the large fins and the small fins conduct temperature to defrost, which effectively improves the defrosting efficiency.

[0004] The patent No. ZL202122436671.0 discloses an "energy-saving and efficient aluminum alloy roof pipe for barrel pump unit liquid supply", which comprises a double-fin aluminum alloy roof pipe, a liquid supply header, a gas return header, a wire suspension rod, an angle steel support cross arm, a fin pipe fixed plastic support and a 90° connecting elbow; the angle steel support cross arm is provided with a plurality of angle steel support cross arms, the plurality of angle steel support cross arms are fixedly connected to the wire suspension rod, the fin pipe fixed plastic support is fixed to the angle steel support cross arm, the double-fin aluminum alloy roof pipe is supported on the fin pipe fixed plastic support, and the double-fin aluminum alloy roof pipe is connected with the liquid supply pipe and the gas return header through the 90° connecting elbow; the liquid supply pipe and the gas return header are connected through the 90° connecting elbow. The design of the gas return header is higher than that of the double-fin aluminum alloy roof pipe, and the design of the liquid supply header is lower than that of the double-fin aluminum alloy roof pipe, so that the roof pipe can store liquid, the temperature rise caused by machine shutdown is avoided, and the energy consumption is saved by more than 25%. SUMMARY

[0005] To address the aforementioned technical problems, this utility model provides a novel roof-mounted pipe system for low-temperature cold storage, equipped with suspension rods, crossbeams, a dryness sensor, and steel-aluminum joints. This system effectively transfers the overall weight of the aluminum alloy roof-mounted pipe system to the load-bearing structure of the cold storage roof. It also measures the dryness of the gas in the CO2 return manifold, reducing the amount of CO2 pipe filled, ensuring full liquid evaporation, and preventing uneven liquid distribution. At the joints, it ensures both the strength and rigidity of the steel while also meeting the lightweight and corrosion-resistant characteristics of the aluminum, effectively solving the aforementioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is as follows:

[0007] The novel low-temperature cold storage top pipe assembly includes suspension rods, crossbeams, a dryness sensor, and a double-pipe top pipe assembly, characterized in that...

[0008] The dual-tube top-mounted pipe assembly includes a CO2 pipe, a hot fluorine gas pipe, and fins. The hot fluorine gas pipe is located at the upper end of the CO2 pipe. The CO2 pipe and the hot fluorine gas pipe are fixedly connected by fins. A predetermined number of fins are fixedly arranged along the axial direction of the CO2 pipe and the hot fluorine gas pipe, respectively. The dual-tube top-mounted pipe assembly is made of aluminum alloy. The predetermined number of dual-tube top-mounted pipe assemblies are arranged on the same horizontal plane. An air inlet and return assembly is provided at the left end of the dual-tube top-mounted pipe assembly. The air inlet and return assembly includes a hot fluorine gas inlet manifold and a CO2 return manifold. A liquid supply and return assembly is provided at the right end of the dual-tube top-mounted pipe assembly. The liquid supply and return assembly includes a CO2 liquid supply manifold and a hot fluorine gas return manifold. The dual-tube top-mounted pipe assembly, the air inlet and return assembly, and the liquid supply and return assembly are integrated into a single structure.

[0009] The crossarms are set to a preset number, and the preset number of crossarms are arranged horizontally in a prescribed sequence. The crossarms are set on the underside of the preset number of double-pipe top pipe assemblies. The crossarms are perpendicular to the axis of the double-pipe top pipe assemblies. The suspension rods are made of carbon structural steel and are set as two symmetrically arranged Y-shaped structures. The suspension rods include two symmetrically arranged upper longitudinal ribs of the load-bearing structure, two bent anchors, two additional suspension rods, two lower longitudinal ribs of the load-bearing structure, and two suspension rods. The upper longitudinal ribs and bent anchors of the load-bearing structure are fixedly set on the upper end of the load-bearing structure of the low-temperature cold storage roof. The lower ends of the two suspension rods are symmetrically fixed to support the two ends of the crossarms through fasteners.

[0010] The CO2 tube is supplied with a tank pump, and a dryness sensor is fixedly installed on the CO2 return manifold. The dryness sensor is used to measure the dryness of the gas in the CO2 return manifold. By using the tank pump and the dryness sensor together, the filling amount of the CO2 tube can be reduced, full liquid evaporation can be ensured, and uneven liquid distribution can be avoided.

[0011] It also includes a steel-aluminum connector, wherein the CO2 liquid supply manifold port is connected to the liquid supply valve through the steel-aluminum connector, the CO2 return gas manifold port is connected to the return gas valve through the steel-aluminum connector, and the hot fluorine gas inlet manifold port is connected to the hot gas valve through the steel-aluminum connector.

[0012] The hot fluorine gas return manifold port is connected to the pressure drain valve via a steel-aluminum joint. The pressure drain valve includes a pressure gauge, valve body, sensor, and manual wheel.

[0013] The hot fluorine gas inlet manifold is connected to the left end of the hot fluorine gas pipe via bend I. The CO2 return manifold is connected to the left end of the CO2 pipe via straight pipe I. The hot fluorine gas inlet manifold is positioned above the CO2 return manifold. The CO2 liquid supply manifold is connected to the right end of the CO2 pipe via bend II. The hot fluorine gas liquid return manifold is connected to the right end of the hot fluorine gas pipe via straight pipe II. The hot fluorine gas liquid return manifold is positioned above the CO2 liquid supply manifold. The rear end of the hot fluorine gas inlet manifold, the front end of the CO2 return manifold, the rear end of the CO2 liquid supply manifold, and the front end of the hot fluorine gas liquid return manifold are all designed as sealed structures.

[0014] It also includes plastic supports, which are fixedly installed on the upper surface of the crossarm by fasteners. The number of plastic supports is equal to the number of crossarms, and the length of the plastic supports matches the length of the crossarm. The crossarm is fixedly secured to the double-tube top pipe assembly by the plastic supports.

[0015] The inner diameter of the CO2 tube is set to 25 mm and the wall thickness is set to 2.5 mm, and the inner diameter of the hot fluorine gas tube is set to 16 mm and the wall thickness is set to 1.7 mm.

[0016] The beneficial effects of this utility model are:

[0017] This utility model is equipped with suspension rods, as well as corresponding double-tube top pipe assembly and crossbeams, which can transfer the overall weight of the aluminum alloy top pipe to the cold storage roof load-bearing structure, effectively solving the problem that the overall weight of the aluminum alloy top pipe cannot be transferred to the cold storage roof load-bearing structure when suspension rods cannot be used.

[0018] This invention incorporates a dryness sensor, along with a corresponding CO2 return gas manifold and a pump-supply structure. It enables the measurement of gas dryness within the CO2 return gas manifold, reducing the CO2 filling volume, ensuring full liquid evaporation, and preventing uneven liquid distribution. This effectively solves the problems associated with not being able to use a dryness sensor, thus preventing the measurement of gas dryness within the CO2 return gas manifold, reducing the CO2 filling volume, ensuring full liquid evaporation, and preventing uneven liquid distribution.

[0019] This utility model includes a steel-aluminum joint, as well as corresponding air inlet and outlet components, liquid supply and return components, liquid supply valve, air return valve, hot air valve, and pressure drain valve. It can ensure the strength and rigidity of the steel at the interface while meeting the lightweight and corrosion-resistant characteristics of the aluminum. It effectively solves the problem that steel-aluminum joints cannot be used, and that it is impossible to ensure the strength and rigidity of the steel at the interface while meeting the lightweight and corrosion-resistant characteristics of the aluminum. Attached Figure Description

[0020] Appendix Figure 1 This is a top view of the structure of this utility model;

[0021] Appendix Figure 2 This is a front view structural diagram of the present invention;

[0022] Appendix Figure 3 This is a front view structural diagram of the suspension rod of this utility model;

[0023] Appendix Figure 4 This is a top view of the suspension rod of this utility model;

[0024] Appendix Figure 5 This is a structural schematic diagram of the AA cross-section of this utility model.

[0025] Legend:

[0026] 1. Hanging rod, 2. Crossbeam, 3. Dryness sensor, 4. Double-pipe top-mounted pipe assembly, 5. CO2 pipe, 6. Hot fluorine gas pipe, 7. Fin, 8. Inlet and return gas assembly, 9. Liquid supply and return liquid assembly, 10. Hot fluorine gas inlet manifold, 11. CO2 return gas manifold, 12. CO2 liquid supply manifold, 13. Hot fluorine gas return liquid manifold, 14. Upper longitudinal rib of load-bearing structure, 15. Bent anchor, 16. Additional hanging rod, 17. Lower longitudinal rib of load-bearing structure, 18. Hanging rod, 19. Steel-aluminum joint, 20. Liquid supply valve, 21. Return gas valve, 22. Hot gas valve, 23. Pressure drain valve, 24. Pressure gauge, 25. Valve body, 26. Sensor, 27. Hand wheel, 28. Bend I, 29. Straight pipe I, 30. Bend II, 31. Straight pipe II, 32. Plastic support. Detailed Implementation

[0027] CombinationFigure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 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:

[0028] The novel low-temperature cold storage top pipe assembly includes a suspension rod 1, a crossbeam 2, a dryness sensor 3, and a double-pipe top pipe assembly 4, characterized in that...

[0029] The dual-tube top-mounted pipe assembly 4 includes a CO2 pipe 5, a hot fluorine gas pipe 6, and fins 7. The hot fluorine gas pipe 6 is located at the upper end of the CO2 pipe 5. The CO2 pipe 5 and the hot fluorine gas pipe 6 are fixedly connected by fins 7. A predetermined number of fins 7 are fixedly arranged along the axial direction of the CO2 pipe 5 and the hot fluorine gas pipe 6. The dual-tube top-mounted pipe assembly 4 is made of aluminum alloy. The dual-tube top-mounted pipe assembly 4 is set in a predetermined number and is arranged on the same horizontal plane. An air inlet and return assembly 8 is provided at the left end of the dual-tube top-mounted pipe assembly 4. The air inlet and return assembly 8 includes a hot fluorine gas inlet manifold 10 and a CO2 return manifold 11. A liquid supply and return assembly 9 is provided at the right end of the dual-tube top-mounted pipe assembly 4. The liquid supply and return assembly 9 includes a CO2 liquid supply manifold 12 and a hot fluorine gas return manifold 13. The dual-tube top-mounted pipe assembly 4, the air inlet and return assembly 8, and the liquid supply and return assembly 9 are set as an integrated structure.

[0030] The crossbeams 2 are set to a preset number, and the preset number of crossbeams 2 are arranged horizontally in a prescribed sequence. The crossbeams 2 are set on the underside of the preset number of double-pipe top-row pipe assemblies 4. The crossbeams 2 are perpendicular to the axis of the double-pipe top-row pipe assemblies 4. The suspension rods 1 are made of carbon structural steel and are set as two symmetrically arranged Y-shaped structures. The suspension rods 1 include two symmetrically arranged upper longitudinal ribs 14 of the load-bearing structure, two bent anchors 15, two additional suspension rods 16, two lower longitudinal ribs 17 of the load-bearing structure, and two hangers 18. The upper longitudinal ribs 14 and bent anchors 15 are fixedly set on the upper end of the load-bearing structure of the low-temperature cold storage roof. The lower ends of the two hangers 18 are symmetrically fixed to support the two ends of the crossbeams 2 through fasteners. The cooperative arrangement of the suspension rods 1 and the crossbeams 2 ensures that the weight of the double-pipe top-row pipe assembly 4 and other components is transferred to the load-bearing structure of the cold storage roof, effectively preventing damage to the cold storage roof due to excessive weight bearing, thereby preventing damage to the cold storage roof structure.

[0031] The liquid supply method of the CO2 pipe 5 is set as a barrel pump liquid supply structure. A dryness sensor 3 is fixedly installed on the CO2 return gas manifold 11. The dryness sensor 3 is used to measure the dryness of the gas in the CO2 return gas manifold 11. The combined use of the dryness sensor 3 and the barrel pump liquid supply method of the CO2 pipe 5 reduces the filling amount of the CO2 pipe 5, ensures full liquid evaporation, and avoids the occurrence of uneven liquid distribution.

[0032] It also includes a steel-aluminum connector 19, the port of the CO2 supply manifold 12 is connected to the supply valve 20 through the steel-aluminum connector 19, the port of the CO2 return manifold 11 is connected to the return valve 21 through the steel-aluminum connector 19, and the port of the hot fluorine gas inlet manifold 10 is connected to the hot gas valve 22 through the steel-aluminum connector 19.

[0033] The port of the hot fluorine gas return manifold 13 is connected to the pressure drain valve 23 via a steel-aluminum connector 19. The pressure drain valve 23 includes a pressure gauge 24, a valve body 25, a sensor 26, and a manual wheel 27.

[0034] The hot fluorine gas inlet manifold 10 is connected to the left end of the hot fluorine gas pipe 6 via a bend I 28. The CO2 return manifold 11 is connected to the left end of the CO2 pipe 5 via a straight pipe I 29. The hot fluorine gas inlet manifold 10 is positioned above the CO2 return manifold 11. The CO2 supply manifold 12 is connected to the right end of the CO2 pipe 5 via a bend II 30. The hot fluorine gas return manifold 13 is connected to the right end of the hot fluorine gas pipe 6 via a straight pipe II 31. The hot fluorine gas return manifold 13 is positioned above the CO2 supply manifold 12. The rear end of the hot fluorine gas inlet manifold 10, the front end of the CO2 return manifold 11, the rear end of the CO2 supply manifold 12, and the front end of the hot fluorine gas return manifold 13 are all designed as sealed structures.

[0035] It also includes plastic supports 32, which are fixedly installed on the upper surface of the crossarm 2 by fasteners. The number of plastic supports 32 is equal to the number of crossarms 2. The length of the plastic supports 32 matches the length of the crossarm 2. The crossarm 2 is fixedly secured to the double-pipe top pipe assembly 4 by the plastic supports 32.

[0036] The inner diameter of the CO2 pipe 5 is set to 25 mm and the wall thickness is set to 2.5 mm, and the inner diameter of the hot fluorine gas pipe 6 is set to 16 mm and the wall thickness is set to 1.7 mm.

[0037] The working principle and process of this utility model are as follows: Specific Implementation

[0038] A certain low-temperature cold storage uses the new type of low-temperature cold storage top pipe. First, check that all equipment is normal and securely connected. Open the liquid supply valve 20 and the return gas valve 21, and close the hot gas valve 22 and the pressure drain valve 23. Low-temperature CO2 liquid is supplied by the tank pump and enters the CO2 liquid supply manifold 12 through the steel-aluminum joint 19. After being distributed by the CO2 liquid supply manifold 12, it is sent to the CO2 pipe 5. After exchanging heat and cold with the air in the cold storage, the low-temperature CO2 liquid becomes CO2 gas and flows into the CO2 return gas manifold 11. It flows back to the unit through the steel-aluminum joint 19. After gas-liquid separation, it is sucked away by the compressor. This cycle is repeated, which is the working procedure of the new type of low-temperature cold storage top pipe refrigeration.

[0039] The dryness sensor 3, which is fixedly installed on the CO2 return gas manifold 11, can measure the dryness of the gas inside the CO2 return gas manifold 11. By using the pump supply structure and the dryness sensor 3 together, the purpose of reducing the filling amount of CO2 pipe 5, ensuring full liquid evaporation, and avoiding uneven liquid distribution can be achieved. A steel-aluminum joint 19 is provided, which can ensure the strength and rigidity of steel at the interface, while also meeting the characteristics of lightweight and corrosion resistance of aluminum.

[0040] The crossbeam 2 and plastic support 32 of the new type of low-temperature cold storage roof pipe are used to fix the double-pipe roof pipe assembly 4. The upper longitudinal rib 14 and bent anchor 15 of the load-bearing structure at the upper end of the suspension rod 1 are fixedly set at the upper end of the load-bearing structure of the low-temperature cold storage roof. The two hangers 18 at the lower end of the suspension rod are fixedly supported at both ends of the crossbeam. The additional suspension rod 16 and the lower longitudinal rib 17 of the load-bearing structure are connected in the middle, which plays the role of transferring the weight of the double-pipe roof pipe assembly 4 and the whole to the load-bearing structure of the cold storage roof, preventing the weight of the new type of low-temperature cold storage roof pipe from being too large and causing overall structural damage to the cold storage roof. Specific Implementation

[0041] Close the liquid supply valve 20, and after a delay of 3-5 minutes, slowly close the return gas valve 21 to evacuate the CO2 refrigerant in the CO2 pipe 5 as much as possible. Slowly open the hot gas valve 22, and the hot fluorine gas enters the hot fluorine gas pipe 6 through the hot fluorine gas inlet manifold 10. After the hot fluorine gas conducts heat exchange with the double-pipe top manifold assembly 4, the frost layer falls off from the double-pipe top manifold assembly 4. The sensor 26 of the pressure drain valve 23 in the hot fluorine gas return liquid manifold 13 detects the pressure in the hot fluorine gas return liquid manifold 13. When the pressure gauge 24 indicates a pressure value greater than 2KG, turn the manual wheel 27 to open the pressure drain valve 23. The high-temperature hot fluorine gas becomes a low-temperature liquid and is discharged into the drain tank through the hot fluorine gas return liquid manifold 13 until defrosting is complete. Then, restart the refrigeration process according to the steps in Specific Embodiment 1.

[0042] The novel low-temperature cold storage top pipe adopts a dual-pipe top pipe assembly 4, an air inlet and return assembly 8, and a liquid supply and return assembly 9 as an integrated structure. This not only makes transportation convenient, installation easy and uniform, but also solves the problem of excessive pressure after the CO2 temperature rises in the top pipe. It also eliminates the need for a separate compressor for hot gas defrosting, reducing investment and saving energy.

Claims

1. A new type of low-temperature cold storage roof row pipe, comprising a hanging rib (1), a cross arm (2), a dryness sensor (3) and a double-pipe roof row pipe assembly (4), characterized in that the double-pipe roof row pipe assembly (4) comprises a CO2 pipe (5), a hot fluorine gas pipe (6) and a fin (7), the hot fluorine gas pipe (6) is arranged at the upper end of the CO2 pipe (5), the CO2 pipe (5) and the hot fluorine gas pipe (6) are fixedly connected through the fin (7), the CO2 pipe (5) and the hot fluorine gas pipe (6) are respectively fixedly provided with a preset number of fins (7) along the axial direction of the pipe, the double-pipe roof row pipe assembly (4) is made of aluminum alloy, the double-pipe roof row pipe assembly (4) is provided with a preset number and arranged on the same horizontal plane, the left end of the double-pipe roof row pipe assembly (4) is provided with an air inlet and gas return assembly (8), the air inlet and gas return assembly (8) comprises a hot fluorine gas inlet header (10) and a CO2 gas return header (11), the right end of the double-pipe roof row pipe assembly (4) is provided with a liquid supply and return assembly (9), the liquid supply and return assembly (9) comprises a CO2 liquid supply header (12) and a hot fluorine gas return header (13), the double-pipe roof row pipe assembly (4), the air inlet and gas return assembly (8) and the liquid supply and return assembly (9) are arranged in an integrated structure. The cross arm (2) is provided in a preset number, the preset number of cross arms (2) are arranged in a specified sequence, the cross arm (2) is arranged below the preset number of double-pipe roof row pipe assemblies (4), the cross arm (2) is perpendicular to the axial direction of the double-pipe roof row pipe assembly (4), the hanging rib (1) is made of carbon structural steel, the hanging rib (1) is provided in a two-symmetric Y-shaped structure, the hanging rib (1) comprises two symmetrically arranged upper load-bearing longitudinal ribs (14), two bent anchors (15), two additional hanging ribs (16), two lower load-bearing longitudinal ribs (17) and two hangers (18), the upper load-bearing longitudinal rib (14) and the bent anchor (15) are fixedly arranged at the upper end of the low-temperature cold storage roof load-bearing structure, the lower ends of the two hangers (18) are fixedly and symmetrically arranged to support the two ends of the cross arm (2) through a fixing member. The CO2 pipe (5) is provided with a bucket pump liquid supply structure, the CO2 gas return header (11) is fixedly provided with a dryness sensor (3), the dryness sensor (3) is used to measure the gas dryness in the CO2 gas return header (11), through the cooperation of the bucket pump liquid supply structure and the dryness sensor (3), the purpose of reducing the filling amount of the CO2 pipe (5), ensuring full-liquid evaporation and avoiding uneven liquid distribution is achieved. It also comprises a steel-aluminum joint (19), the CO2 liquid supply header (12) is connected with a liquid supply valve (20) through the steel-aluminum joint (19), the CO2 gas return header (11) is connected with a gas return valve (21) through the steel-aluminum joint (19), and the hot fluorine gas inlet header (10) is connected with a hot gas valve (22) through the steel-aluminum joint (19).

2. A novel top evaporator coil for a low temperature cold store as claimed in claim 1, characterised in that, ​ 3. A novel top evaporator coil for a low temperature cold store as claimed in claim 2, characterised in that, The hot fluorine gas liquid return header (13) port is connected with the pressure liquid discharge valve (23) through the steel aluminum joint (19), and the pressure liquid discharge valve (23) comprises a pressure gauge (24), a valve body (25), a sensor (26) and a manual wheel (27).

4. A novel top evaporator coil for a low temperature cold store as claimed in claim 3, characterised in that, The hot fluorine gas inlet header (10) is communicated with the left end pipe orifice of the hot fluorine gas pipe (6) through the elbow pipe I (28), the CO2 gas return header (11) is communicated with the left end pipe orifice of the CO2 pipe (5) through the straight pipe I (29), the hot fluorine gas inlet header (10) is arranged above the CO2 gas return header (11), the CO2 liquid supply header (12) is communicated with the right end pipe orifice of the CO2 pipe (5) through the elbow pipe II (30), the hot fluorine gas liquid return header (13) is communicated with the right end pipe orifice of the hot fluorine gas pipe (6) through the straight pipe II (31), and the hot fluorine gas liquid return header (13) is arranged above the CO2 liquid supply header (12).

5. A novel top evaporator coil for a low temperature cold store as claimed in claim 4, characterised in that, The plastic support (32) is fixedly arranged on the upper surface of the cross arm (2) through a fixing member, the number of the plastic supports (32) is equal to that of the cross arms (2), the length of the plastic support (32) matches that of the cross arm (2), and the cross arm (2) is fixedly arranged through the plastic support (32).

6. A novel top evaporator coil for a low temperature cold store as claimed in claim 1 characterised in that, The inner diameter of the CO2 pipe (5) is 25 mm, and the wall thickness is 2.5 mm; and the inner diameter of the hot fluorine gas pipe (6) is 16 mm, and the wall thickness is 1.7 mm.

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