Heat exchange tube, heat exchanger, chiller and processing method

Abstract

The present invention provides a heat exchange tube, a heat exchanger, a chiller and a processing method, relating to the technical field of heat exchangers, aiming to provide a new structure of the heat exchange tube, which has the function of promoting the rapid drainage of the condensate film. The heat exchange tube includes a tube body and fins arranged on the tube body. A flow channel is formed between two adjacent fins. The fins include more than two guiding structures, and each guiding structure is sequentially and spaced apart along the circumferential direction of the fin on the fin. The heat exchange tube provided by the present invention can pierce the liquid film and utilize the change of the surface tension of the liquid film to make the condensed liquid flow downward.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a heat exchange tube, a heat exchanger, a water chiller and a processing method thereof. Background Art

[0002] Commercial water chillers usually adopt horizontal shell-and-tube condensers. As a key heat transfer component in the shell-and-tube condenser, the heat exchange performance of the high-efficiency condensing tube directly affects the energy efficiency and cost of the unit. When the shell-and-tube condenser works, due to the temperature difference between the media on the inner and outer sides of the high-efficiency condensing tube, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor will condense into a liquid on the outer side of the condensing tube, and the heat is transferred to the liquid-phase coolant on the inner side of the tube through the wall surface of the condensing tube, and the coolant absorbs the heat and its temperature rises.

[0003] According to the analysis of the proportion of the thermal resistance on the inner and outer sides of the tube based on the single-tube performance test data, due to factors such as the low thermal conductivity of the refrigerant, the outer side of the tube is the weak side of heat transfer. Therefore, strengthening the tooth-shaped structure on the outer side of the tube and improving the heat transfer performance on the outer side of the tube can effectively improve the heat transfer efficiency of the single tube.

[0004] Based on the above requirements, it is necessary to develop a high-efficiency condensing tube with high liquid drainage capacity on the outer fins to reduce the thickness of the condensate film on the outer fins and enhance the heat transfer efficiency of the heat exchange tube. Summary of the Invention

[0005] The purpose of the present invention is to provide a heat exchange tube, a heat exchanger, a water chiller and a processing method thereof, aiming to provide a new heat exchange tube structure with the function of promoting the rapid drainage of the condensate film. The many technical effects that can be produced by the preferred technical solutions among the many technical solutions provided by the present invention are described in detail below.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A heat exchange tube provided by the present invention includes a tube body and fins provided on the tube body. A flow channel is formed between two adjacent fins. The fins include more than two guiding structures, and each of the guiding structures is sequentially and spaced apart along the circumferential direction of the fin on the fin; alternatively, each of the guiding structures is respectively provided on the fins corresponding to a circumferential circle, and the liquid on the fins can flow to the flow channel through the guiding structures.

[0008] Preferably, one of the guiding structures is a sharp fin platform, and the sharp fin platform is formed on the side of the fin away from the tube body; a tip is formed at the top of the sharp fin platform.

[0009] Furthermore, a guiding inclined surface is formed on the sharp fin platform, and the guiding inclined surface extends obliquely downward from the top of the sharp fin platform towards the flow channel on one side of the sharp fin platform for guiding the liquid to flow to the corresponding flow channel.

[0010] Furthermore, the sharp wing platform is a horizontally placed triangular prism-shaped structure, the edges of the sharp wing platform form the top of the sharp wing platform, and the bottom surface of the sharp wing platform protrudes from the side panel surfaces corresponding to the fin on both sides along the thickness direction of the fin.

[0011] Furthermore, the height between the bottom surface of the sharp wing platform and the outer surface of the tube body is 0.1 mm to 3 mm.

[0012] Preferably, one of the flow-guiding structures is a bending structure, one end of the bending structure is connected to the top of the fin, and the other end extends toward the bottom surface of the flow channel after being bent.

[0013] Furthermore, a first guide groove is provided on the outer plate surface of the bending structure, and the first guide groove extends from the top of the bending structure to the bottom of the bending structure.

[0014] Furthermore, the portion of the fin facing the inner side of the bending structure is called the bending corresponding portion, the bending structure and the bending corresponding portion are inverted V-shaped structures, and the bottom end of the bending structure is in contact with the bottom surface of the flow channel or there is a gap with the bottom surface of the flow channel.

[0015] Furthermore, a second guide groove is provided on the side surface of the bending corresponding portion which is away from the bending structure, and the second guide groove extends from the top of the bending corresponding portion toward the bottom of the bending corresponding portion.

[0016] Furthermore, the top of the bending structure forms a needle structure.

[0017] Furthermore, the thorn needle structure is a horizontally placed triangular prism structure, and the edge of the thorn needle structure forms the top of the thorn needle structure.

[0018] Furthermore, the fin includes two flow-guiding structures, which are distributed on the fin in sequence and spaced apart along the length direction of the fin, and the height of one of the flow-guiding structures is smaller than the height of the other flow-guiding structure.

[0019] The present invention provides a heat exchanger, comprising the heat exchange tube.

[0020] The invention provides a water chiller, comprising the heat exchange tube.

[0021] A processing method for the heat exchange tube described above, where the two diversion structures are a sharp fin platform and a bending structure respectively. The processing method includes the following steps: extruding the fin from the top of the fin to form the sharp fin platform; a to-be-processed rack is formed between two adjacent sharp fin platforms. Knurling is performed from the top of the to-be-processed rack towards the root of the fin on one side of the to-be-processed rack. After knurling for a certain length, a convex platform and a strip-shaped groove are generated. The to-be-processed rack is bent to form the sharp fin platform, and the strip-shaped groove forms the first diversion groove of the bending structure, and the convex platform forms the thorn needle structure of the bending structure.

[0022] Further, the part of the fin facing the inner side of the bending structure is called the bending corresponding part, and a second diversion groove is processed by knurling on the bending corresponding part.

[0023] The heat exchange tube provided by the present invention includes more than two diversion structures on the fin. For example, the fin includes two diversion structures, and the two diversion structures can be sequentially and spaced apart along the circumferential direction of the fin. Each diversion structure has the characteristic of guiding the fin liquid to flow into the flow channel. In addition, there are differences in the structures of the two diversion structures, which may lead to different heights of the two, and to a certain extent, it is also beneficial to break the liquid surface at the top of the fin and facilitate the downward flow of the condensed liquid.

[0024] The preferred technical solution of the present invention can at least further produce the following technical effects:

[0025] The top of the sharp fin platform can be an edge structure, and its top can pierce the liquid film, and utilize the change of the surface tension of the liquid film to make the condensed liquid flow downward. Further, a diversion inclined surface is formed on the sharp fin platform. The top of the sharp fin platform pierces the liquid film and quickly flows downward under the guidance of the diversion inclined surface, and finally converges into the fin-to-fin flow channel;

[0026] The top of the bending structure forms a thorn needle structure. On the one hand, the thorn needle structure increases the heat exchange area of the outer heat exchange fin, and on the other hand, it forms a sharp point, and its top can pierce the liquid film, and utilize the change of the surface tension of the condensed liquid to accelerate the downward flow of the liquid above the thorn needle structure;

[0027] The first diversion groove and the second diversion groove guide the condensed liquid to flow towards the root of the fin, and during the downward flow of the liquid along the first diversion groove and the second diversion groove, the condensed liquid along the way is continuously collected and converged, strengthening the liquid drainage capacity of the outer fin to reduce the thickness of the liquid film on the fin. Description of the Drawings

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of a partial area of the heat exchange tube provided by an embodiment of the present invention;

[0030] Figure 2 It is another schematic structural diagram of a partial area of the heat exchange tube provided by an embodiment of the present invention;

[0031] Figure 3 It is a front view schematic diagram of a partial area of the heat exchange tube provided by an embodiment of the present invention;

[0032] Figure 4 It is a top view schematic diagram of a partial area of the heat exchange tube provided by an embodiment of the present invention.

[0033] In the figure, 1 - tube body; 2 - fin; 3 - flow channel; 4 - sharp fin platform; 41 - guiding inclined plane; 5 - bending structure; 51 - first guiding groove; 6 - second guiding groove; 7 - needle structure. Specific embodiments

[0034] To make the purpose, technical solutions and advantages of the present invention clearer, the following will describe the technical solutions of the present invention in detail. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0035] The present invention provides a heat exchange tube, which includes a tube body 1 and fins 2 arranged on the tube body 1. A flow channel 3 is formed between two adjacent fins 2. The fins 2 include more than two guiding structures, and each guiding structure is sequentially and spacedly distributed on the fins 2 along the circumferential direction of the fins 2; alternatively, each guiding structure is respectively arranged on the fins 2 corresponding to a circumferential circle, and the liquid on the fins 2 can flow towards the flow channel 3 through the guiding structures. For some existing condenser fins, the liquid drainage capacity is poor, and the liquid film covers the outer fins to form a heat transfer thermal resistance, reducing the heat transfer efficiency on the outer side of the tube. The heat exchange tube provided by the present invention includes more than two guiding structures on the fins 2. For example, the fins 2 include two guiding structures, and the two guiding structures can be sequentially and spacedly distributed on the fins 2 along the extending direction of the fins 2. Each guiding structure has the characteristic of guiding the fin liquid to flow into the flow channel 3. In addition, there are differences in the structures of the two guiding structures, which may lead to different heights of the two, and to a certain extent, it is also beneficial to break the liquid surface at the top of the fins, facilitating the downward flow of the condensed liquid. In addition, regarding the distribution of the guiding structures on the fins 2, each guiding structure can also be respectively arranged on the fins 2 corresponding to a circumferential circle.

[0036] As an optional implementation manner, one of the guiding structures is a sharp fin platform 4, and the sharp fin platform 4 is formed on the side of the fin 2 away from the tube body 1. A tip is formed at the top of the sharp fin platform 4. The top of the sharp fin platform 4 can be an edge structure, and its top can pierce the liquid film and utilize the change of the surface tension of the liquid film to make the condensed liquid flow downward. Further, a guiding inclined surface 41 is formed on the sharp fin platform 4, and the guiding inclined surface 41 extends obliquely downward from the top of the sharp fin platform 4 towards the flow channel 3 on one side of the sharp fin platform 4 for guiding the liquid to flow towards the corresponding flow channel 3. The top of the sharp fin platform 4 pierces the liquid film, and under the guidance of the guiding inclined surface 41, it quickly flows towards the lower part and finally converges into the inter-fin flow channel 3.

[0037] As an optional implementation manner, one of the guiding structures is a bending structure 5. One end of the bending structure 5 is connected to the top of the fin 2, and the other end extends towards the bottom surface of the flow channel 3 after bending. Preferably, a needle structure 7 is formed at the top of the bending structure 5. The needle structure 7 increases the heat transfer area of the outer heat exchange fin on the one hand, and forms a sharp point on the other hand. Its top can pierce the liquid film and utilize the change of the surface tension of the condensed liquid to accelerate the downward flow of the liquid above the needle structure 7.

[0038] Preferably, a first guiding groove 51 is arranged on the outer surface of the bending structure 5, and the first guiding groove 51 extends from the top of the bending structure to the bottom of the bending structure. The first guiding groove 51 guides the condensed liquid to flow towards the fin root, and continuously collects and converges the condensed liquid along the way during the downward flow of the liquid along the first guiding groove 51, strengthening the liquid drainage capacity of the outer fin to reduce the thickness of the liquid film on the fin 2.

[0039] As an optionally implemented embodiment, the part of the fin 2 facing the inner side of the bending structure 5 is called the bending corresponding part. The bending structure 5 and the bending corresponding part form an inverted V-shaped structure. The bottom end of the bending structure 5 is in contact with the bottom surface of the flow channel 3 or there is a gap with the bottom surface of the flow channel 3. A second diversion groove 6 is provided on the side surface of the bending corresponding part facing away from the bending structure 5. The second diversion groove 6 extends from the top of the bending corresponding part to the bottom of the bending corresponding part. The second diversion groove 6 guides the condensed liquid to flow towards the fin root, and continuously collects and converges the condensed liquid along the way during the downward flow of the liquid along the second diversion groove 6, enhancing the liquid drainage capacity of the outer fin, so as to reduce the thickness of the liquid film on the fin 2.

[0040] Embodiment 1:

[0041] The present invention provides a heat exchange tube, which includes a tube body 1 and fins 2 arranged on the tube body 1. A flow channel 3 is formed between two adjacent fins 2. The fins 2 include two diversion structures, which are a sharp fin platform 4 and a bending structure 5 respectively. The two diversion structures are sequentially and spaced apart along the circumferential direction of the fin 2 on the fin 2, and the height of one of the diversion structures is less than the height of the other diversion structure.

[0042] Regarding the sharp fin platform 4, specifically as follows: The sharp fin platform 4 is a horizontally placed triangular prism structure. The edge of the sharp fin platform 4 forms the top of the sharp fin platform 4. The length value of the bottom surface of the sharp fin platform 4 in the thickness direction of the fin 2 is greater than the thickness value of the fin 2, and both sides of the bottom surface of the sharp fin platform 4 in the thickness direction of the fin 2 protrude from the corresponding side walls of the fin 2. The height between the bottom surface of the sharp fin platform 4 and the outer surface of the tube body 1 is 0.1 mm to 3 mm.

[0043] Regarding the bending structure 5, specifically as follows: One end of the bending structure 5 is connected to the top of the fin 2, and the other end extends towards the bottom surface of the flow channel 3 after bending. The top of the bending structure 5 forms a thorn needle structure 7. The part of the fin 2 facing the inner side of the bending structure 5 is called the bending corresponding part. The bending structure 5 and the bending corresponding part form an inverted V-shaped structure. The bottom end of the bending structure 5 is in contact with the bottom surface of the flow channel 3 or there is a gap with the bottom surface of the flow channel 3. A first diversion groove 51 is provided on the side surface of the bending structure 5 facing away from the bending corresponding part. The first diversion groove 51 extends from the top of the bending structure to the bottom of the bending structure; a second diversion groove 6 is provided on the side surface of the bending corresponding part facing away from the bending structure 5. The second diversion groove 6 extends from the top of the bending corresponding part to the bottom of the bending corresponding part. The thorn needle structure 7 is a horizontally placed triangular prism structure, and the edge of the thorn needle structure 7 forms the top of the thorn needle structure 7.

[0044] Regarding the processing method of the heat exchange tube provided by the present invention, it can be as follows:

[0045] The inner side of the tube body 1 is processed with internal threads, and fins 2 are processed on the outer side of the tube along the circumferential direction. A circumferentially connected inter-fin flow channel 3 is formed between two adjacent fins 2. When squeezing downward from the fin tops of the fins 2, the fins will form sharp fin platforms 4 that are discontinuously distributed along the circumferential direction. The top of the fin platform is in a "Λ" shape structure, and its vertex can pierce the liquid film, and by utilizing the change in the surface tension of the liquid film, guide the condensate to flow rapidly from both side fin surfaces (the diversion inclined surfaces 41) to the lower part, and finally converge into the inter-fin flow channel 3.

[0046] A to-be-processed rack is formed between adjacent sharp fin platforms 4. One side wall surface of the to-be-processed rack is knurled from the fin top to the fin root direction. After knurling for a certain length, bosses and strip-shaped grooves are generated, and the fin 2 is bent towards the un-knurled side to form a bent structure 5. The bottom end of the bent structure 5 contacts the tube body 1, and as the fin 2 bends, the edge of the boss rotates upward, and finally a needle structure 7 as shown in Figures 1-3 is formed, and a first diversion groove 51 is formed in the diversion groove.

[0047] The part of the fin 2 facing the inner side surface of the bent structure 5 is called the bending corresponding part, and a second diversion groove 6 is knurled from the needle structure 7 to the fin root direction on one side of the bending corresponding part.

[0048] There are 10 - 100 spiral fins 2 per inch along the axial direction, and the height is 0.2 mm - 3 mm. The root of the fin 2 is integrally connected to the tube body 1, and the included angle with the tube body 1 is a right angle; the included angle α between the internal threads of the tube body 1 and the axis of the tube body ranges from 0.1° to 90°, the number of internal racks is 1 - 100, and the height of the internal teeth is 0.1 mm - 2 mm.

[0049] Example 2:

[0050] A heat exchanger includes the heat exchange tube described in Example 1 of the present invention. A diversion structure is arranged on the fin of the heat exchange tube. The two diversion structures are respectively the sharp fin platform 4 and the bent structure 5. The diversion structure can pierce the liquid film, utilize the change in the surface tension of the condensate to accelerate the downward flow of the liquid, strengthen the liquid drainage capacity of the fin, so as to reduce the liquid film thickness on the fin and improve the heat exchange capacity of the heat exchanger.

[0051] Example 3:

[0052] A water chiller includes the heat exchange tube described in Example 1 of the present invention.

[0053] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A heat exchange tube, comprising a tube body (1) and fins (2) arranged on the tube body (1), a flow channel (3) being formed between two adjacent fins (2), characterized in that, The fin (2) comprises more than two flow-guiding structures, each of the flow-guiding structures being sequentially spaced and distributed on the fin (2) along the circumferential direction of the fin (2), and the liquid on the fin (2) can flow toward the flow channel (3) through the flow-guiding structures; One of the flow-guiding structures is a bent structure (5), one end of the bent structure (5) is connected to the top of the fin (2), and the other end extends toward the bottom surface of the flow channel (3) after being bent; A first guide groove (51) is provided on the outer plate surface of the bending structure (5), and the first guide groove (51) extends from the top of the bending structure (5) towards the bottom of the bending structure (5); The portion of the fin (2) facing the inner side of the bending structure (5) is called the bending corresponding portion, the bending structure (5) and the bending corresponding portion are in an inverted V-shaped structure, and the bottom end of the bending structure (5) is in contact with the bottom surface of the flow channel (3) or has a gap with the bottom surface of the flow channel (3); A second guide groove (6) is provided on the side surface of the bending corresponding portion which is away from the bending structure (5), and the second guide groove (6) extends from the top of the bending corresponding portion towards the bottom of the bending corresponding portion; The top of the bent structure (5) forms a thorn structure (7); One of the flow-guiding structures is a sharp fin platform (4), the sharp fin platform (4) being formed on a side of the fin (2) away from the tube body (1), and a tip being formed on the top of the sharp fin platform (4).

2. The heat exchange tube according to claim 1, characterized in that, A flow guiding slope (41) is formed on the sharp wing platform (4), and the flow guiding slope (41) extends obliquely downward from the top of the sharp wing platform (4) toward the flow channel (3) on one side of the sharp wing platform (4), so as to guide liquid to flow toward the corresponding flow channel (3).

3. The heat exchange tube according to claim 2, characterized in that, The sharp wing platform (4) is a horizontally placed triangular prism-shaped structure, and the edges of the sharp wing platform (4) form the top of the sharp wing platform (4).

4. The heat exchange tube according to claim 1, characterized in that, The height between the bottom surface of the sharp wing platform (4) and the outer surface of the tube body (1) is 0.1 mm to 3 mm.

5. The heat exchange tube according to claim 1, characterized in that, The puncture needle structure (7) is a horizontally placed triangular prism-shaped structure, and the edges of the puncture needle structure (7) form the top of the puncture needle structure (7).

6. The heat exchange tube according to claim 1, wherein The fin (2) comprises two flow-guiding structures, the two flow-guiding structures being distributed on the fin (2) in sequence and at intervals along the circumferential direction of the fin (2), and the height of one of the flow-guiding structures is smaller than the height of the other flow-guiding structure.

7. A heat exchanger, characterized in that, Comprising the heat exchange tube described in any one of claims 1-6.

8. A chiller, characterized in that, Comprising the heat exchange tube described in any one of claims 1-6.

9. A processing method for a heat exchange tube according to any one of claims 1-6, characterized in that, The two flow-guiding structures are respectively a sharp wing platform (4) and a bent structure (5), and the processing method comprises the following contents: Extruding the fin (2) from the top of the fin (2) to form the sharp fin platform (4); A to-be-processed rack is formed between two adjacent sharp fin platforms (4). Knurling is performed on one side of the to-be-processed rack from the top of the to-be-processed rack towards the root direction of the fin (2). After knurling for a certain length, a boss and a strip-shaped groove are generated. The to-be-processed rack is bent to form the bent structure (5). The strip-shaped groove forms the first diversion groove (51) of the bent structure (5), and the boss forms the thorn needle structure (7) of the bent structure (5).

10. The processing method of the heat exchange tube according to claim 9, characterized in that, The part of the fin (2) facing the inner side of the bent structure (5) is called the bending corresponding part, and a second diversion groove (6) is knurled on the bending corresponding part.

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