Composite heat exchange tube, processing method thereof and composite heat exchanger

Abstract

The invention relates to a composite heat exchange tube, a process processing method thereof and a composite heat exchanger, the composite heat exchange tube comprises a base tube, an outer layer tube and a plurality of heat exchange fin assemblies; the outer-layer pipe is arranged on the base pipe in a sleeving manner; the heat exchange fin assembly comprises a plurality of fin bodies distributed in the circumferential direction of the outer layer pipe, and each fin body and the outer layer pipe are integrally formed. The multiple heat exchange fin assemblies are arranged at intervals in the airflow flowing direction. According to the heat exchanger, the heat exchange fin assembly and the outer-layer pipe are integrally formed, that is, the four faces of the outer-layer pipe are directly subjected to cutting and fin shoveling to be integrally formed, the production technological process of an existing heat exchanger is reduced by simplifying the process operation, the assembling steps are reduced, and the machining difficulty and cost are reduced; and welding is not needed, contact heat resistance does not exist, the convection heat exchange area heat exchange performance of the heat exchange tube is greatly improved, and materials are saved.

Description

Technical Field

[0001] The present application relates to the field of heat exchangers, and particularly to a composite heat exchange tube, a process for processing the same, and a composite heat exchanger. Background Art

[0002] In order to improve the heat exchange effect between high-temperature flue gas and low-temperature water on both sides of the heat transfer tube, traditional heat exchangers are provided with fins on the heat transfer tube to increase the heat exchange area. Currently, high-temperature heat exchangers are mainly shell-and-tube fin heat exchangers. The base tube and fins of the tube-fin heat exchanger are formed separately. The base tube is mostly a circular tube, an elliptical tube, a flat elliptical tube, etc., and the fins are mostly flat sheet structures with micro-turbulence structures such as flanging and perforation. By arranging multiple fins on the base tube at a certain distance periodically to increase the heat exchange area between the fluids inside and outside the tube, and realizing the fastening connection between the base tube and the fins by means of tube expansion or welding. For multiple sets of tube fins, an intermediate U-shaped bend or connection water box welding is also required. The heat transfer tube generally adopts a thin-walled uniform tube. In order to increase the heat exchange effect of the inner water flow and solve local vaporization, a turbulence spring or turbulence piece is generally installed inside the heat transfer tube.

[0003] Currently, the original tube-fin heat exchanger requires multiple devices for fin stamping, tube expansion, and requires a large amount of manpower for fin, turbulence piece, U-shaped tube or water box installation and welding. There are many installation parts, the process flow is complex, it consumes manpower, and the efficiency is low. At the same time, the copper material cost of the heat exchanger is high. Summary of the Invention

[0004] The present application provides a composite heat exchange tube, a process for processing the same, and a composite heat exchanger. The fin body and the outer layer tube are integrally formed, that is, a fin structure is formed by cutting and shoveling fins directly on the four outer surfaces of the heat exchange tube. By simplifying the process operation, the production process flow of the existing heat exchanger is reduced, thereby reducing the assembly steps, lowering the processing difficulty and cost, and without welding, reducing the contact thermal resistance and enhancing the heat transfer effect.

[0005] To this end, the present application provides a composite heat exchange tube, comprising:

[0006] A base tube;

[0007] An outer layer tube sleeved on the base tube;

[0008] A plurality of heat exchange fin assemblies, each of the heat exchange fin assemblies comprising a plurality of fin bodies circumferentially distributed along the outer layer tube, and each of the fin bodies being integrally formed with the outer layer tube; wherein, the plurality of heat exchange fin assemblies are arranged at intervals along the air flow direction.

[0009] As a preferred solution of the present application, the base tube and the outer layer tube form a composite tube by extrusion or hot melting.

[0010] As a preferred embodiment of the present application, the heat exchange fin assembly is formed on the outer layer tube by a fin fluting process, and a chamfered area is provided on the wall of the outer layer tube.

[0011] As a preferred embodiment of the present application, the plurality of fin bodies are respectively a first fin, a second fin, a third fin and a fourth fin; the first fin and the third fin are arranged opposite to each other; the second fin and the fourth fin are symmetrically arranged;

[0012] Wherein, the first fin and the third fin are respectively arranged at an angle with the second fin and the fourth fin.

[0013] As a preferred embodiment of the present application, the second fin and the fourth fin are respectively located on the side wall of the outer layer tube parallel to the air flow direction; the second fin and the fourth fin are formed by fluting cutting and extend in a direction away from the outer layer tube, and are both inclined with respect to the outer wall of the outer layer tube.

[0014] As a preferred embodiment of the present application, the second fin and the fourth fin are both in a regular corrugated shape, an irregular corrugated shape, an intermittent corrugated shape, a zigzag shape or a straight shape.

[0015] As a preferred embodiment of the present application, the first fin is located on the side wall of the outer layer tube perpendicular to the air flow direction; the first fin is formed by fluting cutting and extends in a direction away from the outer layer tube, and its width is equal to the width of the side wall of the outer layer tube.

[0016] As a preferred embodiment of the present application, the third fin is formed by fluting cutting and extends in a direction away from the outer layer tube; wherein, the width of the third fin is equal to the width of the first fin, and the fluting height of the first fin is greater than the fluting height of the third fin.

[0017] As a preferred embodiment of the present application, it further includes turbulator sheets, the turbulator sheets penetrate through the base tube and are respectively exposed at both ends of the base tube; the long edges of the turbulator sheets are fixedly connected to the wall of the base tube in the air flow direction.

[0018] As a preferred embodiment of the present application, the turbulator sheets are provided with a plurality of through holes at intervals, and the plurality of through holes are parallel and spaced apart;

[0019] And / or, the turbulator sheets are further provided with flanges, the flanges are located on one side of the through holes, and the projection of the flanges in the air flow direction is arranged at a certain inclination angle with respect to the base tube.

[0020] A composite heat exchanger, comprising:

[0021] At least two of the above-mentioned composite heat exchange tubes, and a plurality of the composite heat exchange tubes are arranged in parallel along the air flow direction;

[0022] Connectors, which are respectively connected to two adjacent composite heat exchange tubes to form a composite heat exchanger.

[0023] As a preferred solution of the present application, the connector includes:

[0024] A U-shaped tube that communicates two adjacent composite heat exchange tubes;

[0025] Two connectors, which are respectively connected to the head and tail ends of the composite heat exchange tube connected to the U-shaped tube.

[0026] As a preferred solution of the present application, the connector includes:

[0027] A tube bundle assembly, which is respectively connected to both ends of a plurality of the composite heat exchange tubes;

[0028] A box cover, which is arranged on the tube bundle assembly to form a composite heat exchanger with a series circuit.

[0029] A process method for the above-mentioned composite heat exchange tube includes the following steps:

[0030] Provide a base tube, sleeved with an outer layer tube on the base tube, and make the base tube and the outer layer tube form a composite tube through extrusion or hot melting process;

[0031] On the outer layer tube along the air flow direction, process a heat exchange fin assembly through an integral molding process;

[0032] As a preferred solution of the present application, it further includes: installing a turbulence sheet through the base tube to form a composite heat exchange tube;

[0033] The beneficial effects of the present application:

[0034] The composite heat exchange tube includes a base tube, an outer layer tube and a plurality of heat exchange fin assemblies; the outer layer tube is sleeved on the base tube; the heat exchange fin assembly includes a plurality of fin bodies distributed circumferentially along the outer layer tube, and each fin body is integrally formed with the outer layer tube; wherein, a plurality of the heat exchange fin assemblies are arranged at intervals along the air flow direction.

[0035] Among them, the base tube is the core component of the composite heat exchange tube, responsible for carrying the fluid and transferring heat; the outer tube is sleeved outside the base tube, forming a composite tube structure with the base tube, which not only ensures the flow and heat exchange of the internal fluid, but also enhances the stability and durability of the external structure. The heat exchange fin assembly is distributed circumferentially along the outer tube, which can guide the air flow to evenly flow through the surface of the heat exchange tube, avoiding local air flow concentration or stagnation, thereby improving the heat exchange uniformity; the fin body is integrally formed with the outer tube, that is, the fin structure is formed by cutting and shoveling fins directly on the four outer surfaces of the heat exchange tube, reducing the production process flow of the existing heat exchanger by simplifying the process operation; and there is no need for welding, reducing the contact thermal resistance and enhancing the heat transfer effect; multiple heat exchange fin assemblies are arranged at intervals along the air flow direction to ensure that the flue gas can evenly pass through the surfaces of each fin, avoiding local high temperature or low speed areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 is a schematic structural diagram of a composite heat exchange tube according to the first embodiment;

[0039] Figure 2 is Figure 1 a side view structural diagram of

[0040] Figure 3 is Figure 1 a front view structural diagram of

[0041] Figure 4 is Figure 1 a top view structural diagram of

[0042] Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 are Figure 1 side views of different shapes of the second fin and the fourth fin in

[0043] Figure 10 is Figure 1 a structural diagram of the turbulence piece in

[0044] Figure 11 is a schematic structural diagram of the composite heat exchanger according to the first embodiment;

[0045] Figure 12 Another structural schematic diagram of the composite heat exchanger of the first embodiment;

[0046] Figure 13 Side view structural diagram of the composite heat exchange tube of the second embodiment.

[0047] Description of reference numerals:

[0048] 1, Turbulent flow sheet; 11, Through hole; 12, Flanging; 2, Composite tube; 21, Base tube; 22, Outer layer tube; 3, Finned body; 31, First fin; 32, Second fin; 33, Third fin; 34, Fourth fin; 6, U-shaped tube; 7, Connector; 8, Tube bundle assembly; 9, Lid. Detailed implementation manners

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0050] First embodiment

[0051] As Figures 1 to 4 shown, a composite heat exchange tube includes a base tube 21, an outer layer tube 22 and a plurality of heat exchange fin assemblies; the outer layer tube 22 is sleeved on the base tube 21; each of the heat exchange fin assemblies includes a plurality of finned bodies 3 circumferentially distributed along the outer layer tube 22, and each of the finned bodies 3 is integrally formed with the outer layer tube 22; wherein, the plurality of heat exchange fin assemblies are arranged at intervals along the air flow direction.

[0052] Wherein, as Figures 1 to 4As shown, the base tube 21 is the core component of the composite heat exchange tube, responsible for carrying fluids (such as water or other media) and transferring heat; the outer tube 22 is sleeved outside the base tube 21 to form the composite tube 2 structure with the base tube 21, which not only ensures the flow and heat exchange of the internal fluid but also enhances the stability and durability of the external structure, further enhancing the mechanical properties of the heat exchange tube. The heat exchange fin assembly is distributed circumferentially along the outer tube 22, which can guide the air flow to evenly flow through the surface of the heat exchange tube, avoiding local air flow concentration or stagnation, thereby improving the heat exchange uniformity; the fin body 3 is integrally formed with the outer tube 22, that is, the fin structure is directly formed by cutting and shoveling fins on the four sides of the heat exchange tube. Compared with the processing flow of the original heat exchanger, the process is simpler, the degree of mechanization is higher, greatly shortening the product manufacturing process. At the same time, the material cost of all fins is lower, which can effectively reduce the production cost of the heat exchanger; moreover, the outer tube 22 and the fins do not need to be welded, reducing the contact thermal resistance and enhancing the heat transfer effect; at the same time, it also avoids the weak points that may be brought by welding or mechanical connection, improving the strength and durability of the overall structure. In addition, multiple heat exchange fin assemblies are arranged at intervals along the air flow direction to ensure that the flue gas can evenly pass through the surfaces of each fin, avoiding local high-temperature or low-speed areas.

[0053] Further, as Figures 1 to 4 shown, multiple said composite heat exchange tubes are arranged side by side along the parallel air flow direction; for two adjacent composite heat exchange tubes, the second fin 32 of the composite heat exchange tube in the front abuts against the fourth fin 34 of the composite heat exchange tube in the back, the two adjacent first fins 31 are arranged at intervals, and the two adjacent third fins 33 are also arranged at intervals, and so on. Under the connection of the connecting piece, a composite heat exchanger with multiple composite heat exchange tubes arranged side by side and stacked is formed to form a continuous heat exchange surface, guiding the flue gas to flow along the designed path, avoiding air flow disorder or stagnation, so as to enhance its heat exchange efficiency. In addition, multiple composite heat exchange tubes are arranged side by side and stacked, further enhancing the strength and impact resistance of the overall structure.

[0054] Further, as Figures 1 to 4As shown in the figure, a bimetal composite tube 2 is used as the heat transfer tube of the high-temperature heat exchanger. The inner base tube 21 is made of a metal that is resistant to high temperatures, corrosion, and harmless to the human body, such as copper, stainless steel, etc. The outer tube 22 is made of a metal with high thermal conductivity, low cost, relatively low melting point, and excellent processing performance, such as aluminum and its alloys, etc. The base tube 21 and the outer tube 22 are integrally processed, that is, the base tube 21 and the outer tube 22 form a composite tube 2 through extrusion or hot melting. Preferably, the shape of the base tube 21 is a flat elliptical tube. It should be noted that the windward area of the base tube 21 is smaller than that of a circular tube under the same water flow conditions. The fins on the windward surface effectively reduce the temperature and speed, reduce the impact pressure loss of the flue gas, and enhance the heat transfer performance. In addition, the inside of the outer tube 22 is elliptical, and the outer surface is a flat tube structure as a whole. This makes the base tube 21 and the inner base tube 21 closely connected, which can not only enhance the structural strength and overall strength of the composite tube 2, prevent deformation, but also effectively increase the overall heat transfer area of the heat exchanger. At the same time, economic benefits and processing convenience are also considered.

[0055] Furthermore, as Figures 1 to 4 shown in the figure, the heat exchange fin assembly is formed on the outer tube 22 through the process of fin milling, and a chamfering area is provided on the wall of the outer tube 22. To elaborate further, the fins and the wall of the outer tube 22 are integrally formed, without welding, there is no contact thermal resistance, which can increase the heat transfer performance of the heat exchanger. The mechanized operation efficiency is relatively high, avoiding the potential safety hazards and low efficiency caused by manual welding. Compared with the processing process of the original heat exchanger, it is simpler and has a higher degree of mechanization, greatly shortening the product manufacturing process. At the same time, the material cost of all fins is lower, which can effectively reduce the production cost of the heat exchanger. In addition, after the milling of the heat exchange fin assembly is formed, a certain chamfer will be formed on the side of the outer tube 22 with its windward surface and leeward surface to guide the airflow to transition smoothly, preventing the occurrence of airflow impact and large-scale flow separation phenomena, thereby further optimizing the heat transfer performance.

[0056] Furthermore, as Figures 1 to 4As shown, the multiple fin bodies 3 are respectively the first fin 31, the second fin 32, the third fin 33 and the fourth fin 34; the first fin 31 and the third fin 33 are arranged oppositely; the second fin 32 and the fourth fin 34 are symmetrically arranged; specifically, the opposite and symmetrical arrangements of the fins can balance the structural stress distribution of the heat exchange tube, avoid local deformation or damage caused by air flow impact or thermal stress, and improve the stability and durability of the overall structure. Among them, the first fin 31 and the third fin 33 are respectively arranged at an angle with the second fin 32 and the fourth fin 34, which can destroy the laminar state of the air flow, increase the turbulence intensity, and enhance the heat exchange effect. That is to say, the arrangement of the multiple fin bodies 3 significantly increases the effective heat exchange area of the heat exchange tube, thereby improving the overall performance of the heat exchanger. In addition, the fin body 3 is formed by shovel-tooth cutting process on the outer tube 22, so that the fin body 3 and the outer tube 22 are integrally formed, making full use of the material performance of the outer surface of the outer tube 22, and can also enhance the overall strength of the fin tube, prevent deformation, and effectively increase the overall heat exchange area of the heat exchanger. The fins on the windward side effectively reduce the air flow temperature and velocity, improve the heat exchange performance while reducing the flow resistance; and the relative, symmetrical and angular settings are adopted, which reduces the processing difficulty and cost, and also ensures that there is no welding point between them, no contact thermal resistance, and avoids weak points caused by welding or connection, thereby improving the reliability and efficiency of the entire heat exchange system.

[0057] Further, as Figures 1 to 4 shown, the second fin 32 and the fourth fin 34 are respectively located on the side wall of the outer tube 22 parallel to the air flow direction; the second fin 32 and the fourth fin 34 are formed by shovel-tooth cutting and extend in a direction away from the outer tube 22, and are both inclined to the outer wall of the outer tube 22. Among them, the second fin 32 and the fourth fin 34 fully exchange heat with the directly gap high-temperature incoming flue gas and the flue gas after being shoveled and heat exchanged by the first fin 31 on the windward side. Specifically, the flue gas can pass evenly through the surfaces of each fin and have efficient convective heat exchange with the fins, improving the heat exchange efficiency; the radiative heat exchange between the fins and the flue gas is also enhanced, further improving the heat exchange effect; through the heat conduction of the inner and outer fins of the tube, the heat can be more effectively transferred to the water body inside the tube, rapidly increasing the water temperature; thereby reducing the formation of large-scale eddies, reducing the flow resistance, and reducing the energy loss; at the same time, reducing the boundary layer thickness of the heat exchange surface, increasing the wall turbulence intensity, and further improving the heat exchange efficiency; in addition, by optimizing the geometric parameters of the base tube 21 and the shoveled fins, while ensuring efficient heat exchange, the material usage can be reduced, and the manufacturing cost can be lowered. That is, the flue gas passes evenly through the surfaces of each fin, reducing the local pressure drop, and the overall pressure drop is better than that of the original heat exchanger, reducing the system operation energy consumption.

[0058] Further, asFigures 5 to 9 As shown, both the second fin 32 and the fourth fin 34 are in regular corrugated shape, irregular corrugated shape, intermittent corrugated shape, zigzag shape or straight shape, which is beneficial to achieve contact heat exchange with high-temperature flue gas. This includes but is not limited to this, and other shape structures that are beneficial to achieve heat exchange can also be selected.

[0059] Furthermore, the first fin 31 is located on the side wall of the outer layer tube 22 perpendicular to the air flow direction; the first fin 31 is formed by shovel tooth cutting and extends in a direction away from the outer layer tube 22, and its width is equal to the width of the side wall of the outer layer tube 22; preferably, the first fin 31 is a flat fin. Further detailed description is that the first fin 31, as the windward shovel fin, directly contacts the high-temperature incoming air flow facing the outer layer tube 22 for efficient heat exchange. By heat exchange, the surface temperature of the air flow is reduced, the air flow temperature drops, the volume decreases, and the density increases. After the air flow cools down, the flow rate decreases, reducing the impact on the outer layer tube 22 and lowering the flow resistance. The first fin 31 guides the air flow, making the air flow flow closely along the fin surface. Passing through the chamfered area of the outer layer tube 22, the air flow can smoothly transition to the shovel tooth heat exchange areas of the second fin 32 and the fourth fin 34 on the side, avoiding flow separation and vortex generation. Among them, by first reducing the air flow temperature and flow rate through the first fin 31, the impact force of the air flow on the outer layer tube 22 is reduced, and at the same time the flow resistance is lowered; then through the guiding action of the first fin 31, the air flow distribution becomes more uniform, avoiding local high-temperature or high-speed areas and improving the overall heat exchange efficiency; after that, after passing through the first fin 31, the air flow temperature decreases and the flow becomes more stable, providing good conditions for entering the heat exchange areas of the second fin 32 and the fourth fin 34, further enhancing the overall heat exchange performance. The second fin 32 and the fourth fin 34 further heat exchange the air flow processed by the first fin 31, making full use of the heat energy of the air flow. The first fin 31, the second fin 32 and the fourth fin 34 complement each other, jointly enhancing the overall performance of the composite tube 2 heat exchanger and achieving the goals of efficient heat exchange, low pressure drop and material saving.

[0060] Furthermore, as Figures 1 to 4As shown, the third fin 33 is formed by straddle milling and extends in a direction away from the outer layer tube 22; preferably, the third fin 33 is a flat fin; wherein, the third fin 33 has the same width as the first fin 31, and the straddle milling height of the first fin 31 is greater than that of the third fin 33. Specifically, the leeward area is the main area where vortices are formed, and after heat exchange through the first fin 31, the second fin 32, and the fourth fin 34, the flue gas temperature has been significantly reduced, and the heat exchange efficiency is relatively low. Although the heat exchange efficiency of the third fin 33 is not high, it can still participate in a certain heat exchange process to further utilize the waste heat of the flue gas. Therefore, the main function of the third fin 33 is to support the outer layer tube 22, thereby enhancing the rigidity of the overall structure, preventing the outer layer tube 22 from deforming under high temperature and airflow impact, and ensuring the stability and durability of the structure.

[0061] Since the main function of the third fin 33 is support rather than efficient heat exchange, the designed height of the third fin 33 is relatively low, which avoids generating additional flow resistance in the leeward area, reduces excessive interference with the airflow, reduces the formation of vortices, and further optimizes the flow characteristics of the airflow; at the same time, it reduces the material consumption. That is to say, the first fin 31, the second fin 32, and the fourth fin 34 are responsible for the main heat exchange, while the third fin 33 provides the necessary support and auxiliary heat exchange function. Through the synergistic effect with the first fin 31, the second fin 32, and the fourth fin 34, they jointly ensure the efficient heat exchange and structural stability of the composite tube 2.

[0062] Further, as Figure 10 shown, it further includes a turbulence sheet 1, the turbulence sheet 1 penetrates through the base tube 21 and is exposed at both ends of the base tube 21 respectively; the long side of the turbulence sheet 1 along the airflow direction is fixedly connected to the tube wall of the base tube 21 respectively, forming a stable internal support structure, enhancing the structural rigidity of the base tube 21, and preventing the base tube 21 from deforming under high temperature and high pressure. Among them, the main function of the turbulence sheet 1 is to disrupt the laminar flow state of the fluid in the base tube 21, enhance the turbulence effect, so that by increasing the turbulence intensity of the fluid, it can effectively thin the fluid boundary layer, reduce the boundary layer thickness, further improve the heat exchange efficiency, and enable heat to be transferred to the fluid inside the tube more quickly.

[0063] Further, as Figure 10As shown, the turbulent flow sheet 1 is provided with a plurality of through holes 11 at intervals. The plurality of through holes 11 are arranged in parallel and at intervals to change the flow path of the flue gas inside the base pipe 21, provide a more suitable flow channel and flow velocity for the flue gas, make the distribution of the flue gas more uniform inside the base pipe 21, thereby reducing heat loss and improving the heat exchange efficiency. The turbulent flow sheet 1 is further provided with a flange 12. The flange 12 is located on one side of the through hole 11, and the projection of the flange 12 along the gas flow direction is arranged at a certain inclination angle with respect to the base pipe 21 to form a turbulent flow with a smaller resistance, enhance the turbulent intensity of the flue gas, further reduce the boundary layer thickness, and improve the heat exchange efficiency. Among them, the settings of the through hole 11 and the flange 12 increase the surface area of the turbulent flow sheet 1, thereby increasing the heat exchange area and further improving the heat exchange performance.

[0064] A composite heat exchanger, as Figures 11 to 12 shown, includes at least two of the above-mentioned composite heat exchange tubes and connectors; the plurality of composite heat exchange tubes are arranged in parallel in the direction of the parallel gas flow; for two adjacent composite heat exchange tubes, the second fin 32 of the composite heat exchange tube in the front abuts against the fourth fin 34 of the composite heat exchange tube in the back. Two adjacent first fins 31 are arranged at intervals, and two adjacent third fins 33 are also arranged at intervals, and so on, and a composite heat exchanger with a plurality of composite heat exchange tubes arranged side by side and stacked is formed under the connection of the connectors to form a continuous heat exchange surface, guide the flue gas to flow along the designed path, avoid air flow disorder or stagnation, and enhance its heat exchange efficiency. In addition, the plurality of composite heat exchange tubes are arranged side by side and stacked, further enhancing the strength and impact resistance of the overall structure. Among them, the plurality of composite heat exchange tubes are arranged in parallel and connected by connectors, so that the fluid can flow continuously between the plurality of heat exchange tubes, make full use of the heat exchange capacity of each heat exchange tube, and improve the overall heat exchange efficiency. The specific structure of this composite heat exchanger refers to the above-mentioned embodiments. Since a composite heat exchanger adopts all the technical solutions of the above-mentioned all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be elaborated one by one here.

[0065] Further, as Figure 11 shown, the connector includes a U-shaped pipe 6 and two connectors 7; the U-shaped pipe 6 connects two adjacent composite heat exchange tubes to form a continuous flow channel, so that the fluid can flow continuously between the plurality of heat exchange tubes to achieve an efficient heat exchange process; the two connectors 7 are respectively connected to the head and tail ends of the composite heat exchange tube connected to the U-shaped pipe 6 to ensure the sealing and stability of the flow channel.

[0066] Further, as Figure 12As shown in the figure, the connecting member includes a tube bundle assembly 8 and a box cover 9; the tube bundle assembly 8 is respectively connected to both ends of a plurality of the composite heat exchange tubes; the box cover 9 is arranged on the tube bundle assembly 8 to form a composite heat exchanger with a series circuit. Among them, the tube bundle assembly 8 is used to connect both ends of a plurality of composite heat exchange tubes, integrate the plurality of composite heat exchange tubes together to form an integral heat exchange unit; the box cover 9 is installed on the tube bundle assembly 8 to seal and fix the tube bundle assembly 8, ensure the sealing performance of the connection and the structural stability, prevent fluid leakage and structural deformation, so as to form a composite heat exchanger with a series circuit. Through the setting of the tube bundle assembly 8 and the box cover 9, a plurality of composite heat exchange tubes form a series circuit, enabling the fluid to continuously flow between the plurality of heat exchange tubes to achieve an efficient heat exchange process. In addition, the composite heat exchange tubes and the heat exchange fins are responsible for efficient heat exchange, the turbulence fins 1 optimize the internal flow, and the tube bundle assembly 8 and the box cover 9 ensure the continuity of the flow channel and the structural stability.

[0067] A processing method for the above-mentioned composite heat exchange tube includes the following steps:

[0068] As Figures 1 to 4 shown in the figure, a base tube 21 is provided, an outer layer tube 22 is sleeved on the base tube 21, and the base tube 21 and the outer layer tube 22 are formed into a composite tube 2 through an extrusion or hot melting process;

[0069] The double-metal composite tube 2 is used as the heat transfer tube of a high-temperature heat exchanger. The metal of the inner base tube 21 is a metal that is heat-resistant, corrosion-resistant, and harmless to the human body, such as copper, stainless steel, etc., and the outer layer tube 22 is a metal with high thermal conductivity, low cost, lower melting point, and excellent processing performance, such as aluminum and its alloys, etc.; the base tube 21 and the outer layer tube 22 are integrally processed, that is, the base tube 21 and the outer layer tube 22 are formed into the composite tube 2 through extrusion or hot melting; preferably, the shape of the base tube 21 is a flat elliptical tube; the inside of the outer layer tube 22 is elliptical, and the outer surface is a flat tube structure as a whole; so that the base tube 21 is closely connected to the inner base tube 21, which can not only enhance the structural strength and overall strength of the composite tube 2, prevent deformation, but also effectively increase the overall heat exchange area of the heat exchanger, and at the same time consider economic benefits and processing convenience.

[0070] As Figures 1 to 4 shown in the figure, on the outer layer tube 22 along the gas flow direction, a heat exchange fin assembly is processed through an integral forming process;

[0071] Specifically, the fin body 3 and the outer tube 22 are integrally formed, that is, the fins are directly formed by cutting on the four sides of the heat exchange tube, which simplifies the process operation and reduces the production process of the existing heat exchanger; and there is no need for welding, so there is no contact thermal resistance, which can increase the heat exchange performance of the heat exchanger. The mechanized operation efficiency is relatively high, avoiding the potential safety hazards and low efficiency caused by manual welding; compared with the processing process of the original heat exchanger, it is simpler and has a higher degree of mechanization, greatly shortening the product manufacturing process. At the same time, the cost of all fin materials is lower, which can effectively reduce the production cost of the heat exchanger. Among them, when the cutting teeth of the heat exchange fin assembly are formed, chamfers will be formed on the sides of the outer tube 22 with its windward side and leeward side to guide the airflow to transition smoothly, preventing airflow impact and large-scale flow separation phenomena, thereby further optimizing the heat exchange performance.

[0072] Further, it also includes: turbulator 1 is installed through the base tube 21 to form a composite heat exchange tube;

[0073] Among them, as Figure 4 , Figure 10 shown, the main function of the turbulator 1 is to destroy the laminar state of the fluid in the base tube 21, enhance the turbulent effect, and thus by increasing the turbulent intensity of the fluid, it can effectively thin the fluid boundary layer, reduce the boundary layer thickness, further improve the heat exchange efficiency, and enable heat to be transferred to the fluid in the tube more quickly.

[0074] Among them, the processing method of the above-mentioned composite heat exchange tube is simpler than the processing process of the original heat exchange tube, with a higher degree of mechanization, greatly shortening the product manufacturing process. At the same time, the cost of all fin materials is lower, which can effectively reduce the production cost of the heat exchanger. In addition, multi-faceted cutting teeth are made on the surface of the outer tube 22, making full use of the material properties of the outer surface of the outer tube 22, enhancing the overall strength of the finned tube, preventing deformation, and effectively increasing the overall heat exchange area of the heat exchange tube. The fins on the windward side effectively reduce the air flow temperature and velocity, improving the heat exchange performance while reducing the flow resistance.

[0075] Second Embodiment

[0076] As Figure 13 shown, for the sake of simplicity, only the differences between the second embodiment and the first embodiment will be described below. The difference between this second embodiment and the first embodiment is that the shapes of the base tube 21 and the outer tube 22 are set as regular corrugated shapes that fit the second fins 32 and the fourth fins 34; they can also be irregular corrugated shapes, discontinuous corrugated shapes, broken line shapes (not shown in the figure), including but not limited to this, and other shape structures that are conducive to heat exchange can also be selected. In this embodiment, the specific structure of the composite heat exchange tube refers to the above-mentioned embodiment, so it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be elaborated here one by one.

[0077] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0078] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, provided that these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and variations.

[0079] As described above, this is the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A composite heat exchange tube, characterized in that: include: Base tube (21); An outer layer tube (22) is sleeved on the base tube (21); A plurality of heat exchange fin assemblies, wherein the heat exchange fin assemblies include a plurality of fin bodies (3) distributed along the circumference of the outer tube (22), and each of the fin bodies (3) is integrally formed with the outer tube (22); wherein the plurality of heat exchange fin assemblies are arranged at intervals along the airflow direction.

2. The composite heat exchange tube according to claim 1, characterized in that: The base tube (21) and the outer layer tube (22) are formed into a composite tube (2) by extrusion or hot melting.

3. The composite heat exchange tube according to claim 1, characterized in that: The heat exchange fin assembly is opened on the outer tube (22) by means of a fin tooth-cutting process, and a chamfered area is opened on the tube wall of the outer tube (22).

4. The composite heat exchange tube according to claim 1, characterized in that: The plurality of fin bodies (3) are respectively a first fin (31), a second fin (32), a third fin (33) and a fourth fin (34); the first fin (31) and the third fin (33) are arranged opposite to each other; the second fin (32) and the fourth fin (34) are arranged symmetrically; Wherein, the first fin (31) and the third fin (33) are arranged at an angle with the second fin (32) and the fourth fin (34) respectively.

5. The composite heat exchange tube according to claim 4, characterized in that: The second fin (32) and the fourth fin (34) are respectively located on the side wall of the outer tube (22) parallel to the airflow direction; the second fin (32) and the fourth fin (34) are formed by shovel cutting and extend in a direction away from the outer tube (22), and are both arranged at an angle to the outer wall of the outer tube (22).

6. The composite heat exchange tube according to claim 5, characterized in that: The second fin (32) and the fourth fin (34) are both in the shape of regular corrugations, irregular corrugations, discontinuous corrugations, broken lines or straight lines.

7. The composite heat exchange tube according to claim 4, characterized in that: The first fin (31) is located on the side wall of the outer tube (22) perpendicular to the airflow direction; the first fin (31) is formed by shovel cutting and extends in a direction away from the outer tube (22), and its width is equal to the width of the side wall of the outer tube (22).

8. The composite heat exchange tube according to claim 4, characterized in that: The third fin (33) is formed by shoveling cutting and extends in a direction away from the outer tube (22); wherein the width of the third fin (33) is equal to that of the first fin (31), and the shoveling height of the first fin (31) is greater than the shoveling height of the third fin (33).

9. The composite heat exchange tube according to claim 1, characterized in that: It also comprises a turbulence sheet (1), which penetrates the base tube (21) and is exposed at both ends of the base tube (21); the long sides of the turbulence sheet (1) are fixedly connected to the tube wall of the base tube (21) along the airflow direction.

10. The composite heat exchange tube according to claim 9, characterized in that: The turbulence sheet (1) is provided with a plurality of through holes (11) at intervals, and the plurality of through holes (11) are arranged in parallel and at intervals; And / or, the turbulence sheet (1) is further provided with a flange (12), the flange (12) is located on one side of the through hole (11), and the projection of the flange (12) along the airflow direction is arranged at a certain inclination angle with the base tube (21).

11. A composite heat exchanger, characterized in that: include: At least two composite heat exchange tubes according to any one of claims 1 to 10, wherein the plurality of composite heat exchange tubes are arranged in parallel along the flow direction of the parallel gas flow; The connecting pieces are respectively connected to two adjacent composite heat exchange tubes to form a composite heat exchanger.

12. The composite heat exchanger according to claim 11, characterized in that: The connecting piece comprises: A U-shaped tube (6) connecting two adjacent composite heat exchange tubes; Two connectors (7) are respectively connected to the head and tail ends of the composite heat exchange tube that has been connected to the U-shaped tube (6).

13. The composite heat exchanger according to claim 11, characterized in that: The connecting piece comprises: A tube bundle integrated component (8) is respectively connected to both ends of the plurality of composite heat exchange tubes; A box cover (9) is arranged on the tube bundle integrated component (8) to form a composite heat exchanger of a series circuit.

14. A processing method for a composite heat exchange tube according to any one of claims 1 to 10, characterized in that: The steps include: A base tube (21) is provided, an outer tube (22) is disposed outside the base tube (21), and the base tube (21) and the outer tube (22) are formed into a composite tube (2) through an extrusion or hot-melt process; A heat exchange fin assembly is processed on the outer tube (22) along the airflow direction through an integrated molding process.

15. The process for processing a composite heat exchange tube according to claim 14, characterized in that: Also includes: A turbulence sheet (1) is installed through the base tube (21) to form a composite heat exchange tube.

Images