Low-resistance high-efficiency double-layer spiral cross countercurrent heat exchanger

Abstract

The utility model discloses a low-resistance high-efficiency double-layer spiral cross countercurrent heat exchanger, which relates to the field of heat exchangers, and adopts the technical scheme that the low-resistance high-efficiency double-layer spiral cross countercurrent heat exchanger comprises a heat exchange sealing bin, and a heat exchange tube group, a hot end inlet collecting tube, a hot end outlet collecting tube and a cold end inlet collecting tube are arranged in an inner cavity of the heat exchange sealing bin; each heat exchange tube group comprises a hot end heat exchange spiral tube and a cold end heat exchange spiral tube which are spirally wound with each other; the inlet end of each hot end heat exchange spiral pipe is communicated with the hot end inlet collecting pipe; the outlet end of each hot end heat exchange spiral pipe is communicated with a hot end outlet collecting pipe; the inlet ends of the cold end heat exchange spiral pipes communicate with the cold end inlet collecting pipe, and the outlet ends of the cold end heat exchange spiral pipes are suspended in an inner cavity of the heat exchange sealing bin. The hot-end heat exchange spiral pipe and the cold-end heat exchange spiral pipe are in a spiral winding mode, the contact area is larger, the hot-end heat exchange spiral pipe and the cold-end heat exchange spiral pipe are fixed in a matched mode through the long screw, the aerogel composite heat insulation screw gasket, the pressing gasket and the pressing nut, contact is tighter, more sufficient heat exchange can be achieved, and the heat exchange efficiency is higher.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, and in particular to a low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger. Background Technology

[0002] Heat exchangers, as core equipment for industrial heat transfer, are widely used in chemical, power, HVAC, seawater desalination, food processing and other fields.

[0003] Traditional heat exchangers include shell-and-tube heat exchangers and plate heat exchangers, etc.

[0004] Shell-and-tube heat exchangers (such as tubular and U-tube types) rely on straight tubes or simple bends in their design. The hot and cold fluids are mostly in co-current or partially in counter-current flow, and the heat transfer coefficient is typically between 3,000 and 8,000 W / (m²). 2 ·K), which is insufficient to meet the requirements for efficient heat exchange.

[0005] Although plate heat exchangers induce turbulence through corrugated plates, their heat transfer efficiency is limited by the plate spacing (3–5 mm) and the rubber seal structure (5,000–8,000 W / (m²)). 2 It is difficult to balance K) and pressure resistance (<1.6MPa).

[0006] Boundary layer effect: In traditional heat exchangers, fluids tend to form a stable boundary layer, which leads to increased thermal resistance and decreased heat transfer efficiency.

[0007] In summary, traditional heat exchangers all suffer from low heat exchange efficiency and insufficient heat transfer efficiency. Utility Model Content

[0008] To address the aforementioned technical problems, this invention provides a low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger. The hot-end and cold-end heat exchange spiral tubes are spirally wound, resulting in a larger contact area and tighter contact, enabling more thorough heat exchange and higher heat exchange efficiency.

[0009] The technical solution adopted by this utility model to solve its technical problem is: a low-resistance, high-efficiency double-layer spiral cross counterflow heat exchanger, including a heat exchange sealing chamber, wherein the inner cavity of the heat exchange sealing chamber is provided with a heat exchange tube group, a hot end inlet manifold, a hot end outlet manifold and a cold end inlet manifold;

[0010] The heat exchange tube group is provided in several groups, and the heat exchange tube group includes a hot-end heat exchange spiral tube and a cold-end heat exchange spiral tube that are spirally intertwined.

[0011] The inlet end of each of the hot-end heat exchange spiral tubes is connected to the hot-end inlet manifold, and the hot-end inlet manifold is connected to the outside through the wall of the heat exchange sealing chamber;

[0012] The outlet end of each of the hot-end heat exchange spiral tubes is connected to the hot-end outlet manifold, and the hot-end outlet manifold is connected to the outside through the wall of the heat exchange sealing chamber.

[0013] The inlet end of each of the cold-end heat exchange spiral tubes is connected to the cold-end inlet manifold, the cold-end inlet manifold is connected to the outside through the wall of the heat exchange sealing chamber, the outlet end of each of the cold-end heat exchange spiral tubes is suspended in the inner cavity of the heat exchange sealing chamber, and the side wall of the heat exchange sealing chamber is provided with a cold-end outlet that connects the inside and outside.

[0014] The hot-end fluid enters through the outer port of the hot-end inlet manifold, then flows from the inlet end of each hot-end heat exchange spiral tube to the outlet end, and then flows out through the hot-end outlet manifold to the outer port. The cold-end fluid enters through the outer port of the cold-end inlet manifold, then flows from the inlet end of each cold-end heat exchange spiral tube to the outlet end, then merges into the inner cavity of the heat exchange sealing chamber, and finally flows out from the cold-end outlet.

[0015] Preferably, the inlet ends of the hot-end heat exchange spiral tube and the cold-end heat exchange spiral tube are arranged in opposite directions.

[0016] It can achieve cross-current flow of cold and hot fluids, which can further improve heat exchange efficiency.

[0017] Preferably, a long screw is inserted through the middle of the heat exchange tube assembly. An aerogel composite insulation screw gasket, a compression gasket, and a compression nut are respectively provided from the inside to the outside at both ends of the long screw corresponding to the heat exchange tube assembly. The compression nut pushes the compression gasket and the aerogel composite insulation gasket to fix the long screw relative to the heat exchange tube assembly.

[0018] The heat exchange tube assembly can be relatively fixed by using long screws and other structures, and the use of insulating gaskets can avoid heat loss caused by heat conduction and cross-interference of heat exchange temperatures.

[0019] Preferably, the ports of the hot-end inlet manifold, the hot-end outlet manifold, and the cold-end inlet manifold are respectively fixed to the wall of the heat exchange sealing chamber using flange bolts; an aerogel composite insulation gasket is respectively provided between the wall of the heat exchange sealing chamber and the ports of the hot-end inlet manifold, the hot-end outlet manifold, and the cold-end inlet manifold.

[0020] Aerogel composite insulation gaskets can provide a sealing effect and prevent heat loss from the outside of the heat exchange sealing chamber caused by the thermal conduction of metal.

[0021] Preferably, the heat exchange sealing chamber is equipped with an exhaust valve. During operation, air must be released from the heat exchange sealing chamber through this exhaust valve; otherwise, it cannot operate. It can also be used to release air when the internal pressure is too high, thus regulating the internal pressure.

[0022] Preferably, a drain pipe is connected to the bottom of the heat exchange sealing chamber via a flange, and an aerogel composite insulating flange gasket is installed between the drain pipe and the heat exchange sealing chamber. This is used to drain contaminants from the heat exchange sealing chamber. The aerogel composite insulating flange gasket serves to seal and block heat conduction in this area.

[0023] Preferably, the heat exchange sealing chamber has base support beams at both the front and rear of its bottom, and the two ends of the base support beams are fixed downwards to support bases by bolts. The support bases provide support for the heat exchange sealing chamber.

[0024] Preferably, both ends of the hot-end outlet manifold and the cold-end inlet manifold are respectively provided with side-sliding assemblies; the side-sliding assemblies also include a grooved rail, a caster support beam, and casters;

[0025] The groove rail is fixed to the bottom of the heat exchange sealing chamber, and the end of the groove rail points to the side wall of the heat exchange sealing chamber.

[0026] The caster support beam is provided with several axles, and casters are mounted on the axles via bearings. The outer ends of the axles are locked with caster nuts to fit the casters and the groove rail.

[0027] During internal maintenance, the heat exchange tube assembly can be moved out from the side wall of the heat exchange sealing chamber, and the casters and rails make it easier and more convenient to move.

[0028] Preferably, the heat exchange tube assembly, the hot-end inlet manifold, the hot-end outlet manifold, and the cold-end inlet manifold are coated with an aerogel composite thermal insulation encapsulation coating; the outer wall of the heat exchange sealed chamber is also coated with an aerogel composite thermal insulation encapsulation coating. The aerogel composite thermal insulation encapsulation coating provides thermal insulation, preventing heat conduction from the heat exchange tube assembly, the hot-end inlet manifold, the hot-end outlet manifold, and the cold-end inlet manifold to the heat exchange sealed chamber, and simultaneously preventing heat conduction from the heat exchange sealed chamber to the outside.

[0029] Preferably, the inner wall of the side plate of the heat exchange sealing chamber is provided with a heat-absorbing grid. The heat-absorbing grid is used to absorb the radiant heat of the heat exchange unit group, so that the cold-end fluid can make fuller use of the radiant heat of the heat exchange unit, reduce heat loss, and improve heat exchange efficiency.

[0030] Advantages of this utility model:

[0031] After the cold-end fluid undergoes heat exchange through the spiral structure of the heat exchange tube assembly, it can further absorb the residual heat within the heat exchange sealed chamber. The heat exchange process is achieved through the spiral structure. Due to the integrated construction of the cold-end outlet and the side wall of the heat exchange sealed chamber, the cold-end outlet can be directly connected to the inlet of the circulating pump. This eliminates the need for a series circulating pump at the cold-end inlet in traditional plate heat exchangers for forced circulation heat exchange, effectively reducing the secondary pressure drop of the circulating pump and thus lowering its energy consumption to achieve low-resistance operation. All key components utilize aerogel composite insulation material to block outward heat conduction, reducing heat loss and maximizing heat utilization to improve heat exchange efficiency.

[0032] In this design, the hot-end and cold-end heat exchange spiral tubes are spirally wound together, resulting in a larger contact area. The hot-end and cold-end heat exchange spiral tubes are fixed together by a long screw, an aerogel composite insulation screw gasket, a compression gasket, and a compression nut, resulting in a tighter contact and enabling more complete heat exchange with higher efficiency. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only eight of the drawings in this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of an embodiment of the present utility model with a shell.

[0035] Figure 2 This is a schematic diagram of an embodiment of the present utility model without a shell;

[0036] Figure 3 This is a schematic diagram showing the separation of the hot-end heat exchange spiral tube and the cold-end heat exchange spiral tube in an embodiment of this utility model.

[0037] Figure 4 This is a schematic diagram of the long screw and the clamping nut according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the hot-end inlet manifold, the hot-end outlet manifold, and the cold-end inlet manifold according to an embodiment of the present utility model;

[0039] Figure 6 This is a schematic diagram of the relevant structure of the caster in an embodiment of this utility model;

[0040] Figure 7 This is a schematic diagram of the heat exchange sealing chamber according to an embodiment of the present utility model;

[0041] Figure 8This is a schematic diagram of the side plate and heat-absorbing grid of an embodiment of the present utility model;

[0042] The components are as follows: 1. Heat exchange sealing chamber; 2. Heat exchange tube assembly; 3. Hot-end heat exchange spiral tube; 4. Cold-end heat exchange spiral tube; 5. Hot-end inlet manifold; 6. Hot-end outlet manifold; 7. Cold-end inlet manifold; 8. Long screw; 9. Aerogel composite insulation screw gasket; 10. Compression gasket; 11. Compression nut; 12. Exhaust valve; 13. Drain pipe; 14. Aerogel composite insulation flange gasket; 15. Base support beam; 16. Support base; 17. Channel rail; 18. Caster support beam; 19. Axle; 20. Bearing; 21. Caster; 22. Heat absorption grid; 23. Lifting lug; 24. Cold-end outlet. Detailed Implementation

[0043] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model.

[0044] Example

[0045] like Figure 1 As shown, the low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger includes a heat exchange sealing chamber 1. The inner cavity of the heat exchange sealing chamber 1 is provided with a heat exchange tube group 2, a hot end inlet manifold 5, a hot end outlet manifold 6, and a cold end inlet manifold 7.

[0046] The heat exchange tube group 2 is provided in several groups, and the heat exchange tube group 2 includes a hot end heat exchange spiral tube 3 and a cold end heat exchange spiral tube 4 spirally wound together.

[0047] The inlet end of each of the heat exchange spiral tubes 3 is connected to the heat inlet manifold 5, and the heat inlet manifold 5 is connected to the outside through the wall of the heat exchange sealing chamber 1.

[0048] The outlet end of each of the hot-end heat exchange spiral tubes 3 is connected to the hot-end outlet manifold 6, and the hot-end outlet manifold 6 is connected to the outside through the wall of the heat exchange sealing chamber 1.

[0049] The inlet end of each of the cold end heat exchange spiral tubes 4 is connected to the cold end inlet manifold 7, and the cold end inlet manifold 7 is connected to the outside through the wall of the heat exchange sealing chamber 1. The outlet end of each of the cold end heat exchange spiral tubes 4 is provided with a cold end outlet 24 that connects the inside and outside of the side wall of the heat exchange sealing chamber 1.

[0050] In this scheme, 10 heat exchanger tube groups 2 are set. In practice, the number of heat exchanger tube groups 2 can be expanded as needed.

[0051] After the above components are assembled, they are encapsulated with an aerogel composite insulation layer to effectively suppress heat loss caused by temperature crossover between cold and hot fluids and metal conduction.

[0052] This solution is a double-layer spiral cross-flow heat exchanger characterized by low resistance and high efficiency. Through its unique double-layer spiral structure and counter-flow heat exchange design, this heat exchanger significantly improves heat exchange efficiency while effectively reducing fluid flow resistance. It is suitable for various industrial applications and has broad market prospects and application value.

[0053] The main function of the heat exchange sealing chamber 1 is as a key component for the connection between the container where cold-end fluid flows in and out, and for the internal and external parts. Lifting rings are provided on the side plate of the heat exchange sealing chamber 1 from the top upwards.

[0054] The heat exchange sealing chamber 1 includes side plates and a shell. The shell has an annular structure. Both ends of the shell are sealed by the side plates. The side plates are provided with sealing grooves that are adapted to the ends of the shell. The sealing grooves are sealed with aerogel composite heat insulation sealing strips. The two side plates are connected by 18 sets of bolts and nuts.

[0055] The hot-end fluid enters through the outer port of the hot-end inlet manifold 5, then flows from the inlet end of each hot-end heat exchange spiral tube 3 to the outlet end, and then flows out through the hot-end outlet manifold 6 to the outer port. The cold-end fluid enters through the outer port of the cold-end inlet manifold 7, then flows from the inlet end of each cold-end heat exchange spiral tube 4 to the outlet end, then merges into the inner cavity of the heat exchange sealing chamber 1, and finally flows out from the cold-end outlet 24.

[0056] The inlet ends of the hot-end heat exchange spiral tube 3 and the cold-end heat exchange spiral tube 4 are arranged in opposite directions.

[0057] It can achieve cross-current flow of cold and hot fluids, which can further improve heat exchange efficiency.

[0058] A long screw 8 is inserted through the middle of the heat exchange tube assembly 2. Aerogel composite insulation screw gasket 9, compression gasket 10 and compression nut 11 are respectively arranged from the inside to the outside at both ends of the long screw 8 corresponding to the heat exchange tube assembly 2. The compression nut 11 pushes the compression gasket 10 and the aerogel composite insulation gasket to press and fix the long screw 8 relative to the heat exchange tube assembly 2.

[0059] The heat exchange tube assembly 2 can be relatively fixed by means of long screws 8 and other structures, and the use of insulating gaskets can avoid heat loss and cross-interference of heat exchange temperature caused by heat conduction.

[0060] The ports of the hot-end inlet manifold 5, the hot-end outlet manifold 6, and the cold-end inlet manifold 7 are respectively fixed to the wall of the heat exchange sealing chamber 1 with flange bolts; aerogel composite insulation gaskets are respectively provided between the wall of the heat exchange sealing chamber 1 and the ports of the hot-end inlet manifold 5, the hot-end outlet manifold 6, and the cold-end inlet manifold 7.

[0061] The aerogel composite insulation gasket can provide a sealing function and prevent heat loss caused by the external heat transfer of the heat exchange sealing chamber 1 due to the metal thermal conductivity.

[0062] The heat exchange sealing chamber 1 is equipped with an exhaust valve 12. During operation, air must be discharged from the heat exchange sealing chamber 1 through this exhaust valve 12; otherwise, it cannot operate. It can also be used to exhaust air when the internal air pressure is too high, thereby regulating the internal pressure.

[0063] The bottom of the heat exchange sealing chamber 1 is connected to a drain pipe 13 via a flange, and an aerogel composite insulating flange gasket 14 is installed between the drain pipe 13 and the heat exchange sealing chamber 1. This gasket is used to drain contaminants from the heat exchange sealing chamber 1. The aerogel composite insulating flange gasket 14 serves to seal and block heat conduction in this area.

[0064] The heat exchange sealing chamber 1 has base support beams 15 at the front and rear of its bottom, and support bases 16 are fixed downward at both ends of the base support beams 15 by bolts. The support bases 16 are provided to support the heat exchange sealing chamber 1.

[0065] The hot end outlet manifold 6 and the cold end inlet manifold 7 are respectively provided with side sliding components at both ends; the side sliding components also include a channel rail 17, a caster support beam 18 and a caster 21;

[0066] The groove rail 17 is fixed to the bottom of the heat exchange sealing chamber 1, and the end of the groove rail 17 points to the side wall of the heat exchange sealing chamber 1.

[0067] The caster support beam 18 is provided with a plurality of axles 19, and casters 21 are provided on the axles 19 via bearings 20. The outer ends of the axles 19 are locked with casters 21 nuts to fit the casters 21 and the groove rail 17.

[0068] During internal maintenance, the heat exchange tube assembly can be moved out from the side wall of the heat exchange sealing chamber 1, and the casters and 21 rails 17 make it easier and more convenient to move.

[0069] The heat exchange tube assembly, the hot-end inlet manifold 5, the hot-end outlet manifold 6, and the cold-end inlet manifold 7 are all coated with an aerogel composite thermal insulation encapsulation coating; the outer wall of the heat exchange sealed chamber 1 is also coated with an aerogel composite thermal insulation encapsulation coating. The aerogel composite thermal insulation encapsulation coating provides thermal insulation, preventing heat conduction from the heat exchange tube assembly, the hot-end inlet manifold 5, the hot-end outlet manifold 6, and the cold-end inlet manifold 7 to the heat exchange sealed chamber 1, and simultaneously preventing heat conduction from the heat exchange sealed chamber 1 to the outside.

[0070] The inner wall of the side plate of the heat exchange sealing chamber 1 is provided with a heat-absorbing grid 22. The heat-absorbing grid 22 is used to absorb the radiant heat of the heat exchange unit group, so that the cold-end fluid can make fuller use of the radiant heat of the heat exchange unit, reduce heat loss, and improve heat exchange efficiency. The magnetized anti-scaling magnetic strip group prevents scale formation and extends service life.

[0071] Key technologies described in this embodiment

[0072] 1. In this design, the heat exchanger tube assembly is made of T1 flat round copper tubes (short axis 3-20mm, long axis 6-60mm), wound in the same direction at a 30°-60° angle. The hot and cold fluids flow in opposite directions (Re>1.5×10⁻⁶). 4 This creates a three-dimensional turbulent flow channel. Through optimized design of chemical cleaning frequency, the equipment lifespan is ≥15 years (traditional ≤10 years). Heat transfer performance formula verification: h=0.023·Dhk·Re0.8·Pr0.4

[0073] Parameter definition: Dh = P4A

[0074] (A is the cross-sectional area of ​​the flattened cylindrical tube, P is the wetting perimeter) Example calculation (minor axis 6mm, major axis 12mm):

[0075] Dh=2×(6+12)4×(6×12)=8.5mm

[0076] h=0.023·0.0085401·(1.5×104)0.8·(0.7)0.4=12,200W / (m 2 \cdotpK) Durability Design

[0077] Extended lifespan: Chemical cleaning cycles are extended to 2.5 times that of traditional methods (≥15 years vs ≤10 years).

[0078] parameter Definitions and Explanations unit h convective heat transfer coefficient <![CDATA[W / (m 2 ·K)]]> Dh Equivalent diameter (equivalent diameter of elliptical tube) mm Re Reynolds number - Pr Prandtl number - k Pipe thermal conductivity W / (m·K)

[0079] 2. Insulation system: Aerogel composite felt (thermal conductivity λ<0.02W / (m·K), thickness ≥50mm) Heat loss control formula correction: Qloss=dλAΔT×f (f=1.05-1.15 is the dynamic operating condition correction coefficient)

[0080] Actual measured data: heat loss rate ≤2.8% (@ΔT=750℃, ambient temperature 25℃) for key components;

[0081] Clamping screw: Aerogel sleeve (thickness ≥ 5mm)

[0082] Flange seal: Aerogel composite gasket (compression ratio 25% ± 3%)

[0083] External insulation layer: aerogel composite structure (total thickness ≥ 50 mm).

[0084] parameter Definitions and Explanations unit Qloss Heat loss per unit length of insulation layer W / m d Thickness of aerogel composite felt mm λ Thermal conductivity of aerogel composite felt W / (m·K) A The outer surface area of ​​the aerogel insulation layer <![CDATA[m 2 ]]> ΔT The difference between the temperature of the heat transfer medium and the ambient temperature K f Considering the correction of thermal resistance due to temperature fluctuations -

[0085] 3. Modular Extended Design Unit Parameters: Single-tube heat exchange capacity: q = h·πDL·ΔT = 12,200 × π × 0.0085 × 1 × (820-45) = 32,780 W / m² Total heat exchange area: Atotal = N × πDL (N = 83-833 tubes) Applicable range heat load: 0.1-10MW (based on a single module of 15m²) 3 Standardized components for / h flow calculation:

[0086] The standardized design of aerogel gaskets and flange bolts reduces assembly complexity and lowers procurement costs by 20%–30%.

[0087] parameter Definitions and Explanations unit q Heat transfer power per unit length of a single heat exchange tube W / m h Heat transfer capacity between fluid and pipe wall <![CDATA[W / (m 2 ·K)]]> D The equivalent outer diameter of a flat cylindrical tube (equivalent to the diameter of a cylindrical tube when the minor axis is 6mm and the major axis is 12mm) m L Length of a single heat exchange tube m ΔT Temperature difference between hot and cold fluids K N Total number of heat exchange tubes in a single module

[0088] Advantages of this utility model:

[0089] After the cold-end fluid undergoes heat exchange through the spiral structure of heat exchange tube assembly 2, it can further absorb the residual heat within the heat exchange sealed chamber 1. The heat exchange process is achieved through the spiral structure. Due to the integrated construction of the cold-end outlet and the side wall of the heat exchange sealed chamber, the cold-end outlet can be directly connected to the inlet of the circulating pump. This eliminates the need for a series circulating pump at the cold-end inlet in traditional plate heat exchangers for forced circulation heat exchange, effectively reducing the secondary pressure drop of the circulating pump, thereby lowering its energy consumption, achieving low-resistance operation, and comprehensively improving energy efficiency and equipment lifespan. Its scientific design and engineering verification demonstrate that this technology has significant economic advantages and application prospects in industries such as industrial, HVAC, and seawater desalination, providing an innovative solution for high-efficiency heat exchange equipment. All key components utilize aerogel composite insulation material to block outward heat conduction, reducing heat loss and making fuller use of heat to improve heat exchange efficiency.

[0090] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger, characterized in that, It includes a heat exchange sealing chamber (1), and the inner cavity of the heat exchange sealing chamber (1) is provided with a heat exchange tube group (2), a hot end inlet manifold (5), a hot end outlet manifold (6) and a cold end inlet manifold (7); The heat exchange tube group (2) is provided with several groups, including a hot end heat exchange spiral tube (3) and a cold end heat exchange spiral tube (4) that are spirally intertwined. The inlet end of each of the heat exchange spiral tubes (3) is connected to the heat inlet manifold (5), and the heat inlet manifold (5) is connected to the outside through the wall of the heat exchange sealing chamber (1). The outlet end of each of the hot end heat exchange spiral tubes (3) is connected to the hot end outlet manifold (6), and the hot end outlet manifold (6) is connected to the outside through the wall of the heat exchange sealing chamber (1). The inlet end of each of the cold end heat exchange spiral tubes (4) is connected to the cold end inlet manifold (7), the cold end inlet manifold (7) is connected to the outside through the wall of the heat exchange sealing chamber (1), the outlet end of each of the cold end heat exchange spiral tubes (4) is suspended in the inner cavity of the heat exchange sealing chamber (1), and the side wall of the heat exchange sealing chamber (1) is provided with a cold end outlet (24) connecting the inside and outside.

2. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 1, characterized in that: The inlet end of the hot-end heat exchange spiral tube (3) and the inlet end of the cold-end heat exchange spiral tube (4) are arranged in opposite directions.

3. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 2, characterized in that: A long screw (8) is inserted through the middle of the heat exchange tube assembly (2). The long screw (8) is provided with an aerogel composite heat-insulating screw gasket (9), a compression gasket (10) and a compression nut (11) from the inside to the outside at both ends of the heat exchange tube assembly (2). The compression nut (11) pushes the compression gasket (10) and the heat-insulating gasket to press and fix the long screw (8) relative to the heat exchange tube assembly (2).

4. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 3, characterized in that: The ports of the hot-end inlet manifold (5), the hot-end outlet manifold (6), and the cold-end inlet manifold (7) are respectively fixed to the wall of the heat exchange sealing chamber (1) with flange bolts; aerogel composite insulation gaskets are respectively provided between the wall of the heat exchange sealing chamber (1) and the ports of the hot-end inlet manifold (5), the hot-end outlet manifold (6), and the cold-end inlet manifold (7).

5. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 1, characterized in that: The heat exchange sealing chamber (1) is equipped with an exhaust valve (12).

6. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 1, characterized in that: The bottom of the heat exchange sealing chamber (1) is connected to a drain pipe (13) via a flange, and an aerogel composite heat insulation flange gasket (14) is provided between the drain pipe (13) and the heat exchange sealing chamber (1).

7. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 1, characterized in that: The bottom of the heat exchange sealing chamber (1) is provided with base support beams (15) at the front and back respectively, and the two ends of the base support beams (15) are fixed downward with support bases (16) by bolts.

8. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 1, characterized in that: The hot end outlet manifold (6) and the cold end inlet manifold (7) are respectively provided with side sliding components at both ends; the side sliding components also include a channel rail (17), a caster support beam (18) and a caster (21); The groove (17) is fixed to the bottom of the heat exchange sealing chamber (1), and the end of the groove (17) points to the side wall of the heat exchange sealing chamber (1). The caster support beam (18) is provided with a plurality of axles (19), and the axles (19) are provided with casters (21) through bearings (20). The outer end of the axle (19) is locked with the caster (21) through the caster (21) nut to match the groove rail (17).

9. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 1, characterized in that: The heat exchange tube assembly (2), the hot end inlet manifold (5), the hot end outlet manifold (6) and the cold end inlet manifold (7) are provided with an aerogel composite thermal insulation encapsulation coating; the outer wall of the heat exchange sealing chamber (1) is provided with an aerogel composite thermal insulation encapsulation coating.

10. The low-resistance, high-efficiency double-layer spiral cross-flow heat exchanger according to claim 1, characterized in that: The inner wall of the side plate of the heat exchange sealing chamber (1) is provided with a heat absorption grid (22).

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