Spiral wound heat exchanger and refrigeration system

Abstract

This invention relates to the field of refrigeration technology, and particularly to wound-tube heat exchangers and refrigeration systems. A wound-tube heat exchanger includes a shell assembly, a central cylinder, and heat exchange tubes. The central cylinder is disposed within a shell cavity, and multiple layers of heat exchange tubes are spirally wound around its exterior. Each layer of heat exchange tubes includes multiple heat exchange tubes, each wound into a cylindrical spiral shape. The inner diameter D1 of the cylinder corresponding to the spiral heat exchange tube is defined as a first diameter, and the outer diameter D2 of the cylinder corresponding to the spiral heat exchange tube is defined as a second diameter. Furthermore, at least two heat exchange tubes in at least one layer have different first diameters, and / or at least two heat exchange tubes in at least one layer have different second diameters. The advantages of this invention are: it can increase the tube spacing between adjacent heat exchange tubes in the same layer, alleviating the problem of slowed shell-side medium flow rate caused by dirt and scale blockage, reducing costs, and simultaneously increasing the turbulence of the shell-side medium, thus enhancing heat exchange performance.

Description

Technical Field

[0001] This invention relates to the field of refrigeration technology, and in particular to wound tube heat exchangers and refrigeration systems. Background Technology

[0002] The coiled tube heat exchanger is installed in a refrigeration system for heat exchange. Multiple heat exchange tubes are spirally wound around the outside of a central cylinder. It features a compact design, small footprint, and good heat exchange effect.

[0003] In existing wound-tube heat exchangers, the shell-side medium flows in the shell cavity. Poor water quality can cause dirt and scale buildup. In order to ensure smooth flow of the shell-side medium, the spacing between each heat exchange tube needs to be increased. However, increasing the spacing between tubes will reduce the flow velocity of the shell-side medium and affect the heat exchange performance of the wound-tube heat exchanger. Summary of the Invention

[0004] To address the above problems, the present invention provides a wound-tube heat exchanger, the technical solution of which is as follows:

[0005] A wound-tube heat exchanger includes a shell assembly, a central tube, and heat exchange tubes. The shell assembly has a shell cavity for containing shell-side medium. The central tube is disposed within the shell cavity. Multiple layers of heat exchange tubes are spirally wound around the central tube. The heat exchange tubes are used to contain tube-side medium. Each layer of heat exchange tubes includes multiple heat exchange tubes. Each heat exchange tube is wound into a cylindrical spiral shape. The inner diameter D1 of the cylinder corresponding to the cylindrical spiral heat exchange tube is defined as a first diameter, and the outer diameter D2 of the cylinder corresponding to the cylindrical spiral heat exchange tube is defined as a second diameter. At least two heat exchange tubes in at least one layer of heat exchange tubes have different first diameters, and / or at least two heat exchange tubes in at least one layer of heat exchange tubes have different second diameters.

[0006] This configuration increases the tube spacing between the heat exchange tubes in the same layer, alleviating the problem of slowed shell-side medium flow rate caused by dirt and scale blockage, enhancing anti-clogging and anti-scaling capabilities. Furthermore, the overall volume of the wound-tube heat exchanger does not need to be increased, reducing costs, while also increasing the turbulence of the shell-side medium and enhancing heat exchange performance.

[0007] In one embodiment, at least two heat exchange tubes in at least one layer of heat exchange tubes have different first diameters, and the first diameter of each heat exchange tube in the same layer of heat exchange tubes is different from the first diameter of the adjacent heat exchange tubes; multiple heat exchange tubes in the same layer of heat exchange tubes form a wavy shape on the inner side near the central cylinder; and / or, at least two heat exchange tubes in at least one layer of heat exchange tubes have different second diameters, and the second diameter of each heat exchange tube in the same layer of heat exchange tubes is different from the second diameter of the adjacent heat exchange tubes; multiple heat exchange tubes in the same layer of heat exchange tubes form a wavy shape on the outer side away from the central cylinder.

[0008] This configuration can further enhance the turbulence effect of the shell-side medium.

[0009] In one embodiment, adjacent heat exchange tubes in the same layer have the same helical direction, and the heat exchange tubes in adjacent layers have opposite helical directions.

[0010] This configuration not only prevents interference between adjacent heat exchange tubes, but also enhances the turbulence of the shell-side medium between the heat exchange tubes, thereby improving heat exchange efficiency.

[0011] In one embodiment, the cylindrical assembly has a tube-side inlet, and a liquid distribution assembly is provided inside the tube-side inlet, the liquid distribution assembly being connected to the inlet of each heat exchange tube.

[0012] This configuration allows the heat exchange medium to be evenly distributed to each of the heat exchange tubes.

[0013] In one embodiment, the liquid distribution component is a distributor, which has multiple liquid distribution holes, each of which is connected to the inlet of the heat exchange tube.

[0014] This configuration allows the heat exchange medium to be evenly distributed to each of the heat exchange tubes.

[0015] In one embodiment, the cylindrical assembly has a tube-side outlet that communicates with the shell cavity, and a gas collection assembly is provided inside the tube-side outlet, which is connected to the outlet of each heat exchange tube.

[0016] This setup allows the tubular medium to be collected and then flow into the refrigeration system for further processing.

[0017] In one embodiment, a wrapping sleeve is provided between the inner wall of the shell cavity and the heat exchange tube.

[0018] This design prevents the shell-side medium from flowing directly from the outermost heat exchange tubes to the other end of the shell, thus affecting the heat exchange effect. At the same time, it reduces the friction between the inner wall of the shell and the heat exchange tubes, preventing the heat exchange tubes from being rubbed and cracking, which would cause leakage.

[0019] In one embodiment, the heat exchange tube is provided with threads.

[0020] This configuration increases the heat exchange area of ​​the heat exchange tubes.

[0021] In one embodiment, the cylindrical assembly includes a cylindrical body, a first cap, and a second cap, with the first cap and the second cap respectively disposed at both ends of the cylindrical body, and the first cap, the second cap, and the cylindrical body forming a shell cavity.

[0022] This invention also provides the following technical solutions:

[0023] A refrigeration system comprising the aforementioned wound-tube heat exchanger.

[0024] Compared with the prior art, the present invention provides a wound tube heat exchanger, which strengthens the tube spacing between heat exchange tubes in the same layer by setting the first diameter and / or second diameter between at least two heat exchange tubes in at least one layer of heat exchange tubes to be different, thereby alleviating the problem of increased shell-side medium flow resistance caused by dirt blockage or fouling, and can enhance the turbulence of the shell-side medium and improve the heat exchange effect. Attached Figure Description

[0025] Figure 1 This is a perspective view of the wound-tube heat exchanger provided by the present invention;

[0026] Figure 2 for Figure 1 Enlarged view of point C in the image;

[0027] Figure 3 This is a schematic diagram of the central cylinder and heat exchange tubes.

[0028] Figure 4 for Figure 3 Sectional view at point AA;

[0029] Figure 5 for Figure 4 A magnified view of section B in the image;

[0030] Figure 6 This is a side view of the central cylinder and heat exchange tubes.

[0031] The symbols in the diagram represent the following meanings:

[0032] 100. Winded-tube heat exchanger; 101. First end; 102. Second end; 10. Shell assembly; 11. Shell cavity; 12. First shell-side inlet; 13. Second shell-side inlet; 14. Shell; 15. First cap; 16. Second cap; 17. Tube-side inlet; 18. Tube-side outlet; 20. Central cylinder; 30. Heat exchange tube; 40. Liquid distribution assembly; 41. Distributor; 411. Liquid distribution orifice; 412. Capillary tube; 413. Liquid inlet head; 414. Liquid outlet head; 415. Liquid distribution cone; 50. Gas collection assembly. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that when a component is said to be "attached" to another component, it can be directly on the other component or it can be in the middle of another component. When a component is said to be "set" to another component, it can be directly set to the other component or it may also be in the middle of another component. When a component is said to be "fixed" to another component, it can be directly fixed to the other component or it may also be in the middle of another component.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Please see Figure 1 , Figure 1 This is a perspective view of the wound-tube heat exchanger 100 provided by the present invention. The wound-tube heat exchanger 100 provided by the present invention is installed in a refrigeration system for heat exchange. The wound-tube heat exchanger 100 can be used as both an evaporator and a condenser.

[0037] Specifically, the wound-tube heat exchanger 100 includes a shell assembly 10, a central cylinder 20, and heat exchange tubes 30. The shell assembly 10 has a cavity 11. The heat exchange tubes 30 are spirally arranged and layered around the outside of the central cylinder 20. The central cylinder 20 and the heat exchange tubes 30 are disposed within the cavity 11. The spiral shape can enhance the shock resistance of the heat exchange tubes 30 and alleviate the expansion and contraction stress caused by different temperatures. The cavity 11 supplies shell-side medium flow, and the heat exchange tubes 30 supply tube-side medium flow.

[0038] Furthermore, the cylindrical assembly 10 includes a cylindrical body 14, a first cover 15 and a second cover 16. The first cover 15 and the second cover 16 are respectively disposed at both ends of the cylindrical body 14, and the first cover 15, the second cover 16 and the cylindrical body 14 form a cavity 11.

[0039] In other embodiments, two end caps (not shown) can be used instead of the first cover 15 and the second cover 16. The end caps are disc-shaped, and the two end caps are respectively placed on both ends of the cylinder 14 and seal the shell cavity 11, thereby saving costs.

[0040] The wound-tube heat exchanger 100 has a first end 101 and a second end 102 disposed opposite to each other. The shell assembly 10 is provided with a first shell-side connector 12 and a second shell-side connector 13, both of which are in communication with the shell cavity 11. The first shell-side connector 12 is disposed near the second end 102, and the second shell-side connector 13 is disposed near the first end 101. The shell-side medium flows into the shell cavity 11 from the first shell-side connector 12, exchanges heat with the tube-side medium in the heat exchange tube 30, and then flows out from the second shell-side connector 13; or, the shell-side medium flows into the shell cavity 11 from the second shell-side connector 13 and then flows out from the first shell-side connector 12.

[0041] In this embodiment, both the first shell-side connector 12 and the second shell-side connector 13 are located on the shell body 14. In other embodiments, the first shell-side connector 12 and the second shell-side connector 13 may also be located on the second cover 16 and the first cover 15, respectively. It should be noted that in this embodiment, the tube-side medium is refrigerant and the shell-side medium is water. In other embodiments, depending on the properties of the medium, a suitable medium is selected to flow through the tube side, and another medium flows through the shell side.

[0042] Please continue reading Figure 1 , Figure 1 This is a perspective view of the coiled tube heat exchanger 100 provided by the present invention. The shell assembly 10 has a tube-side inlet 17 and a tube-side outlet 18 for the flow of tube-side medium. The tube-side inlet 17 and the tube-side outlet 18 can be provided on the first cover 15 or on the shell 14.

[0043] In this embodiment, both the tube inlet 17 and the tube outlet 18 are located on the first cover 15, and the tube inlet 17 and the tube outlet 18 are located at the same end, so as to accommodate units where the tube medium enters and exits from the same end. Of course, in other embodiments, the tube inlet 17 and the tube outlet 18 may also be located at different ends.

[0044] Specifically, a liquid distribution assembly 40 is provided in the tube-side inlet 17. The liquid distribution assembly 40 is connected to the inlet of the heat exchange tube 30. The liquid distribution assembly 40 is used to evenly distribute the tube-side medium to each heat exchange tube 30.

[0045] Preferably, a gas collecting assembly 50 is provided in the tube outlet 18. The gas collecting assembly 50 is connected to the outlet of the heat exchange tube 30. The gas collecting assembly 50 is used to collect the tube medium flowing out of each heat exchange tube 30 and flow into the pipeline of the refrigeration system.

[0046] In this embodiment, both the liquid separation assembly 40 and the gas collection assembly 50 are distributors 41. The distributor 41 has multiple liquid separation holes 411. The inlet of the heat exchange tube 30 is welded to the liquid separation hole 411 through a capillary tube 412, and the outlet of the heat exchange tube 30 is welded to the liquid separation hole 411 of the gas collection assembly 50 through a capillary tube 412.

[0047] Please see Figure 2 , Figure 2 for Figure 1 Enlarged view at point C in the figure. In this embodiment, the distributor 41 is a liquid distribution head. The liquid distribution head includes an inlet head 413, an outlet head 414, and a liquid distribution cone 415, which are integrally formed. The liquid distribution cone 415 is located between the inlet head 413 and the outlet head 414. The inlet head 413 is located in the tube inlet 17 or the tube outlet 18, and has a flow channel (not shown) for the inlet and outlet of the tube medium. The outlet head 414 is located in the shell cavity 11, and a liquid distribution hole 411 is opened on the outlet head 414. The liquid distribution hole 411 extends from the surface of the outlet head 414 away from the liquid distribution cone 415 into the liquid distribution cone 415 and communicates with the flow channel of the inlet head 413. The axis of the liquid distribution hole 411 is inclined relative to the axis of the liquid distribution head to make the tube medium evenly distributed. In other embodiments, the distributor 41 may be a distributor with an internal dispensing disc. It should be noted that when the dispensing head is used as a dispensing assembly 40, the tubular medium enters from the inlet head 413 and flows out from the outlet head 414; when the dispensing head is used as a gas collecting assembly 50, the tubular medium enters from the outlet head 414 and flows out from the inlet head 413.

[0048] In other embodiments, the liquid separating assembly 40 and the gas collecting assembly 50 may also be tube sheets (not shown), with the tube sheet disposed within the tube-side inlet 17 and tube-side outlet 18. The tube sheet has fixing holes (not shown), and the inlet of the heat exchange tube 30 is expanded into the fixing holes of the tube sheet. In other embodiments, the liquid separating assembly 40 may be a liquid separator or distributor 41, and the gas collecting assembly 50 may be a tube sheet. Alternatively, the liquid separating assembly 40 may be a tube sheet, the gas collecting assembly 50 may be a distributor 41, and the gas collecting assembly 50 may not be provided within the tube-side outlet 18.

[0049] In this embodiment, there is one tube-side inlet 17 and one tube-side outlet 18. In other embodiments, when the refrigeration system is a multi-system system with multiple compressors, the tube-side inlet 17 and tube-side outlet 18 are set to be multiple, and the multiple compressors are connected to the tube-side inlet 17 or the tube-side outlet 18 respectively. When the wound-tube heat exchanger 100 is used as an evaporator, the multiple compressors are connected to the tube-side outlet 18 respectively; when the wound-tube heat exchanger 100 is used as a condenser, the multiple compressors are connected to the tube-side inlet 17 respectively.

[0050] Specifically, a wrapping tube (not shown) is provided between the outermost heat exchange tube 30 and the inner wall of the shell 14. The wrapping tube is wrapped around the outermost heat exchange tube 30 and fixed to the inner wall of the shell 14. The wrapping tube plays a guiding role, preventing the shell-side medium from flowing directly from the outermost heat exchange tube 30 and the inner wall of the shell cavity 11 to the other end of the shell 14, thereby affecting the heat exchange effect. At the same time, it can reduce the friction between the inner wall of the shell 14 and the heat exchange tube 30, and prevent the heat exchange tube 30 from being rubbed and broken, thus causing leakage.

[0051] The heat exchange tube 30 has threads on its inner wall (not shown in the figure), which can increase the heat exchange area of ​​the heat exchange tube 30.

[0052] Please see Figure 3 , Figure 3 This is a schematic diagram of the structure of the central cylinder 20 and the heat exchange tubes 30. Each layer of heat exchange tubes 30 includes multiple heat exchange tubes 30, and each heat exchange tube 30 is spirally wound into a cylindrical shape. That is to say, each heat exchange tube 30 is spirally wound into a cylindrical spring-like structure.

[0053] Specifically, each layer of heat exchange tubes 30 is spaced apart, and adjacent heat exchange tubes 30 in the same layer are spaced apart, so that the shell-side medium can enter the gaps between the layers and the gaps between the tubes to fully exchange heat with the tube-side medium in the heat exchange tubes 30.

[0054] Please see Figure 4 and Figure 6 , Figure 4 for Figure 3 Sectional view at point AA in the diagram. Figure 6This is a side view of the central cylinder 20 and the heat exchange tube 30. The inner diameter D1 of the cylinder corresponding to the spiral heat exchange tube 30 is defined as the first diameter, that is, the diameter of the cylinder corresponding to the inner wall of the spiral heat exchange tube 30 is defined as the first diameter. The outer diameter D2 of the cylinder corresponding to the spiral heat exchange tube 30 is defined as the second diameter, that is, the diameter of the cylinder corresponding to the outer wall of the spiral heat exchange tube 30 is defined as the second diameter. In other words, from the side view of the heat exchange tube 30, the projection of the heat exchange tube 30 is an annular shape, with the inner diameter of the annular shape defined as the first diameter and the outer diameter defined as the second diameter. At least two heat exchange tubes 30 in at least one layer of heat exchange tubes 30 have different first diameters; or, at least two heat exchange tubes 30 in at least one layer of heat exchange tubes 30 have different second diameters; or, at least two heat exchange tubes 30 in at least one layer of heat exchange tubes 30 have different first diameters and different second diameters.

[0055] Understandably, this configuration increases the tube spacing between heat exchange tubes 30 in the same layer without increasing the gap between heat exchange tubes 30 in adjacent layers, thus alleviating the problem of slowed shell-side medium flow rate caused by dirt and scale blockage. Furthermore, by increasing the tube spacing between heat exchange tubes 30 in the same layer without changing the overall volume of the wound tube heat exchanger 100, costs can be reduced, while the turbulence of the shell-side medium can be increased, thereby enhancing heat exchange performance.

[0056] Furthermore, in one embodiment, the first diameter of the heat exchange tube 30 in the same layer is different from the first diameter of the adjacent heat exchange tube 30, so that the multiple heat exchange tubes 30 in the same layer form a wavy shape near the outer side of the central cylinder 20. This arrangement can increase the tube spacing between each heat exchange tube 30 in the same layer and its adjacent heat exchange tubes 30, thereby further enhancing the turbulence of the shell-side medium.

[0057] In another embodiment, the second diameter of the heat exchange tube 30 in the same layer is different from the second diameter of the adjacent heat exchange tube 30, and the outer surface of the multiple heat exchange tubes 30 in the same layer forms a wave shape away from the central cylinder 20. This arrangement can increase the tube spacing between each heat exchange tube 30 in the same layer and its adjacent heat exchange tubes 30, and can further enhance the turbulence of the shell-side medium.

[0058] Preferably, please refer to Figure 5 , Figure 5 for Figure 4The enlarged view at point B in the figure shows that in this embodiment, the wall thickness of each heat exchange tube 30 is equal. Therefore, the first diameter of the heat exchange tube 30 in the same layer of heat exchange tubes 30 is different from the first diameter of the adjacent heat exchange tubes 30, and the second diameter of the heat exchange tube 30 in the same layer of heat exchange tubes 30 is different from the second diameter of the adjacent heat exchange tubes 30. The first diameters of each adjacent heat exchange tube 30 in each layer of heat exchange tubes 30 are different. That is, the heat exchange tubes 30 in the same layer of heat exchange tubes 30 are arranged alternately and staggered, which can further enhance the turbulence effect when the tube-side medium flows. Furthermore, in the same layer of heat exchange tubes 30, the first and second diameters of the first, third, fifth, and odd-numbered heat exchange tubes 30 are equal, and the first and second diameters of the second, fourth, sixth, and even-numbered heat exchange tubes 30 are equal. This not only enhances the turbulence of the shell-side medium, enabling the shell-side medium to form three-dimensional turbulence in the interlayer space of each layer of heat exchange tubes 30, but also simplifies the process. Of course, in other embodiments, the wall thickness of each heat exchange tube 30 may also be set to be unequal; the heat exchange tubes 30 in the same layer of heat exchange tubes 30 may also be set such that the first or second diameter of the first heat exchange tube 30, the fifth heat exchange tube 30, and the ninth heat exchange tube 30 are equal, the first or second diameter of the second heat exchange tube 30, the sixth heat exchange tube 30, and the tenth heat exchange tube 30 are equal, and the first or second diameter of the third heat exchange tube 30, the seventh heat exchange tube 30, and the eleventh heat exchange tube 30 are equal; or, the first diameter of any two adjacent heat exchange tubes 30 in one, two, three, or more layers of heat exchange tubes 30 may be set to be different.

[0059] Furthermore, the spiral directions of the heat exchange tubes 30 in adjacent layers are opposite, which can enhance the turbulence of the shell-side medium between the heat exchange tubes 30, enhance heat transfer, and improve heat transfer efficiency.

[0060] The adjacent heat exchange tubes 30 in the same layer have the same spiral direction, which can prevent the adjacent heat exchange tubes 30 from interfering with each other.

[0061] The present invention also provides a refrigeration system including the above-described coiled heat exchanger 100. When the coiled heat exchanger 100 is used as an evaporator, the inlet of the coiled heat exchanger 100 is connected to a throttle valve (not shown), and the outlet is connected to a gas-liquid separator or a compressor (not shown); when the coiled heat exchanger 100 is used as a condenser, the inlet of the coiled heat exchanger 100 is connected to a compressor, and the outlet is connected to a throttle valve.

[0062] Low-temperature, low-pressure gaseous refrigerant enters the compressor through the compressor suction port, where it is transformed into high-temperature, high-pressure refrigerant by the compressor's work, and then discharged from the compressor discharge port into the condenser. The high-temperature, high-pressure refrigerant exchanges heat in the condenser and becomes a high-temperature, high-pressure liquid refrigerant. It then passes through a throttling valve to become a low-temperature, low-pressure gas-liquid two-phase state, and then enters the evaporator to absorb heat and evaporate before entering the compressor, thus completing the cycle.

[0063] During the operation of the coiled tube heat exchanger 100, the tube-side medium enters from the liquid distribution assembly 40, is evenly distributed by the liquid distribution assembly 40, and then enters each heat exchange tube 30 to exchange heat with the shell-side medium. After heat exchange, it enters the gas collecting assembly 50 to merge. The shell-side medium flows in the gaps between each layer of heat exchange tubes 30 and in the gaps between adjacent heat exchange tubes 30 in the same layer, forming three-dimensional turbulence and strong heat exchange performance.

[0064] The present invention arranges the heat exchange tubes 30 in the same layer in an alternating manner, so that the inner and / or outer surfaces of the heat exchange tubes 30 in the same layer are corrugated. When the shell-side medium flows, it can enhance the turbulence effect and make the shell-side medium form a three-dimensional turbulence, thereby improving the heat exchange performance.

[0065] 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.

[0066] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A wound-tube heat exchanger, comprising a shell assembly (10), a central tube (20), and heat exchange tubes (30), wherein the shell assembly (10) has a shell cavity (11) for accommodating the shell-side medium, the central tube (20) is disposed within the shell cavity (11), and multiple layers of the heat exchange tubes (30) are spirally wound around the outside of the central tube (20), wherein the heat exchange tubes (30) are used to accommodate the tube-side medium; characterized in that Each heat exchange tube (30) includes multiple heat exchange tubes (30), each heat exchange tube (30) is wound into a cylindrical spiral shape, the inner diameter D1 of the cylinder corresponding to the cylindrical spiral heat exchange tube (30) is defined as the first diameter, the outer diameter D2 of the cylinder corresponding to the cylindrical spiral heat exchange tube (30) is defined as the second diameter, and at least two heat exchange tubes (30) in at least one layer of heat exchange tubes (30) have different first diameters, the first diameter of each heat exchange tube (30) in the same layer of heat exchange tubes (30) is different from the first diameter of the adjacent heat exchange tubes (30), and multiple heat exchange tubes (30) in the same layer of heat exchange tubes (30) form a wave shape near the inner side of the central cylinder (20); And / or, at least two heat exchange tubes (30) in at least one layer of heat exchange tubes (30) have different second diameters, and the second diameter of each heat exchange tube (30) in the same layer of heat exchange tubes (30) is different from the second diameter of the adjacent heat exchange tube (30), and the outer surface of multiple heat exchange tubes (30) in the same layer of heat exchange tubes (30) forms a wave shape away from the central cylinder (20).

2. The wound-tube heat exchanger according to claim 1, characterized in that, The adjacent heat exchange tubes (30) in the same layer have the same spiral direction, and the heat exchange tubes (30) in adjacent layers have opposite spiral directions.

3. The wound-tube heat exchanger according to claim 1, characterized in that, The cylindrical assembly (10) is provided with a tube-side inlet (17), and a liquid distribution assembly (40) is provided inside the tube-side inlet (17). The liquid distribution assembly (40) is connected to the inlet of each heat exchange tube (30).

4. The coiled tube heat exchanger of claim 3, wherein, The liquid distribution assembly (40) is a distributor (41), and the distributor (41) has multiple liquid distribution holes (411), which are connected to the inlet of the heat exchange tube (30) respectively.

5. The wound-tube heat exchanger according to claim 1, characterized in that, The cylindrical assembly (10) has a tube outlet (18) which is connected to the shell cavity (11). The tube outlet (18) is provided with a gas collection assembly (50) which is connected to the outlet of each heat exchange tube (30).

6. The coiled tube heat exchanger of claim 1, wherein, A wrapping tube is provided between the inner wall of the shell cavity (11) and the heat exchange tube (30).

7. The coiled tube heat exchanger of claim 1, wherein, The heat exchange tube (30) is threaded.

8. The wound-tube heat exchanger according to claim 1, characterized in that, The cylindrical assembly (10) includes a cylindrical body (14), a first cover (15) and a second cover (16). The first cover (15) and the second cover (16) are respectively located at both ends of the cylindrical body (14). The first cover (15) and the second cover (16) together with the cylindrical body (14) form a cavity (11).

9. A refrigeration system characterized by, Including the coiled tube heat exchanger as described in any one of claims 1 to 8.

Images