Industrial air cooling device, heat dissipation unit of industrial air cooling device and manufacturing method of heat dissipation unit

Abstract

The invention discloses an industrial air cooling device and a heat dissipation unit thereof, the heat dissipation unit comprises a plurality of heat dissipation pipes, each heat dissipation pipe (40) is provided with an inner pipe (41) and an outer pipe at least partially arranged on the inner pipe in a sleeving mode, the outer pipe (42) is provided with a barrel and fins extending from the outer surface of the barrel (42a), and the fins extend from the outer surface of the barrel (42a). An end plate (11) and an isolation plate (12) are arranged at at least one end of the heat dissipation pipes (40), an isolation containing cavity (15) is defined between the end plate (11) and the isolation plate (12) through a sealing strip (13) surrounding the peripheries of the end plate (11) and the isolation plate (12), and the end plate (11) comprises a near side surface close to the fins (42b) and an opposite far side surface. The end plate (11) is provided with an isolation containing cavity (15), a channel (51) is defined on the far side surface of the end plate (11) so as to be in fluid communication with an inner pipe (41) of the heat dissipation pipe (40) and be isolated from the isolation containing cavity (15), a barrel (42a) of the heat dissipation pipe (40) is provided with at least one section of length penetrating through the isolation plate (12), and therefore the isolation plate (12) is located between the fins (42b) and the end plate (11); the inner tube (41) is welded to the end plate (11) at the distal surface.

Description

Technical Field

[0001] The present application generally relates to an industrial air cooling device and a heat dissipation unit thereof, and a method for manufacturing the heat dissipation unit. Background Art

[0002] Air cooling devices (also called air coolers) are widely used in the petroleum, chemical, electric power and other industries to cool various process fluids such as steam, lubricating fluid, hydraulic oil, etc. Generally, such air cooling devices are generally composed of a plurality of heat dissipation units, and the internal fluid channels of each heat dissipation unit are interconnected, so that the process fluid input from the inlet of the air cooling device can flow through the fluid channel and be discharged from the outlet of the air cooling device after cooling. Each heat dissipation unit is arranged with a plurality of heat dissipation pipes arranged side by side to form the internal fluid channel of the heat dissipation unit, and the outer surface of the heat dissipation pipe is in contact with the air. In order to increase the contact area between the outer surface of the heat dissipation pipe and the air, spiral fins may be provided on the outer surface of the heat dissipation pipe. In addition, in order to increase the air circulation to enhance the heat dissipation effect, the air cooling device may be equipped with a blower to drive the air to flow through the spiral fins.

[0003] These heat pipes are usually long and parallel to each other. Therefore, for each heat dissipation unit, the two ends of all the heat dissipation pipes can be connected by an end plate, for example, and a channel is provided on the end plate so that the hollow interior of the heat dissipation pipe is in fluid communication with the channel and thus forms an internal fluid channel of the heat dissipation unit. Usually, the edge of the nozzle of each heat dissipation pipe is welded to the edge of the opening formed on the end plate to ensure the structural connection between the heat dissipation pipe and the end and the liquid-tight connection between the hollow interior of the heat dissipation pipe and the channel provided on the end plate. However, due to the presence of the fins of the heat dissipation pipe, when manufacturing the heat dissipation unit, the heat dissipation pipe can only be welded on the side where the channel on the end plate is located. That is, on the side of the end plate opposite to the channel (i.e., the side exposed to the fins), there must be a gap between the opening edge of the end plate and the outer surface of the heat dissipation pipe.

[0004] When the air cooling device is used in an environment with a high salt content in the air vapor (for example, when used in a seaside environment), as the air used to cool the fluid flowing through the hollow interior of the heat pipe continuously contacts the outer surface of the heat pipe, the water vapor containing excessive salt will enter the above-mentioned gap, thereby causing corrosion between the heat pipe and the end plate at the above-mentioned gap. Long-term corrosion in turn affects the liquid tightness between the heat pipe and the end plate. In addition, due to the presence of the fins of the heat pipe, it is impossible to weld at the above-mentioned gap when assembling the heat dissipation unit. Summary of the invention

[0005] In view of the above technical problems, the present application aims to propose an improved industrial cooling device, a heat dissipation unit for use in such a cooling device, and a method for manufacturing the heat dissipation unit, so as to avoid the situation where the liquid tightness does not meet the standard due to the gap between the heat dissipation pipe and the end plate of the heat dissipation unit being corroded by water vapor containing salt.

[0006] According to one aspect of the present application, a heat dissipation unit of an industrial air cooling device is provided, the heat dissipation unit comprising:

[0007] A plurality of heat dissipation tubes, each of the plurality of heat dissipation tubes comprises an inner tube and an outer tube at least partially sleeved on the inner tube, the outer tube comprising a cylinder and fins extending from an outer surface of the cylinder,

[0008] An end plate and an isolation plate are arranged at at least one end of the plurality of heat dissipation tubes, an isolation cavity is defined between the end plate and the isolation plate via a sealing strip surrounding their periphery, the end plate includes a proximal surface close to the fin and an opposite distal surface, and a channel is defined on the distal surface of the end plate to communicate with the inner tube fluid of the heat dissipation tube and be isolated from the isolation cavity, wherein the barrel of the heat dissipation tube has at least a section of length passing through the isolation plate, so that the isolation plate is located between the fin and the end plate, and the inner tube is welded to the end plate at the distal surface.

[0009] Optionally, a waterproof layer or an anti-corrosion layer or a filler is applied in the isolation cavity.

[0010] Optionally, the waterproof layer or anti-corrosion layer or filler comprises paint, epoxy phenolic, or asphalt.

[0011] Optionally, the heat dissipation unit further comprises a connecting pipe to apply the waterproof layer or anti-corrosion layer or filler into the isolation cavity.

[0012] Optionally, a first through hole is formed in the isolation plate, and a second through hole coaxial with the first through hole is formed in the end plate, the diameter of the first through hole is larger than the diameter of the second through hole, and the first through hole receives the cylinder of the heat dissipation pipe, and the second through hole receives the inner tube of the heat dissipation pipe.

[0013] Optionally, a diameter of the first through hole is slightly larger than an outer diameter of the cylinder, so that the cylinder can pass through the first through hole.

[0014] Optionally, the difference between the diameter of the first through hole and the outer diameter of the cylinder is between 0.5 mm and 1 mm.

[0015] Optionally, the isolation cavity is filled with pressurized inert gas.

[0016] Optionally, the isolation chamber is filled with isolation fluid or flushing fluid.

[0017] Optionally, the isolation fluid includes lubricating oil or liquid paraffin.

[0018] Optionally, the passageway is defined by an end cap member secured to a distal surface of the end plate.

[0019] According to another aspect of the present application, there is also provided a method for manufacturing a heat dissipation unit of an industrial air cooling device, comprising:

[0020] A heat dissipation pipe is provided, the heat dissipation pipe having an inner pipe and an outer pipe sleeved on the inner pipe, the outer pipe having a barrel and fins extending from the outer surface of the barrel, and the heat dissipation pipe at least comprising a first pipe section and an adjacent second pipe section, the first pipe section having a length extending from one end of the heat dissipation pipe toward the other opposite end of the heat dissipation pipe, the heat dissipation pipe is limited only by the inner pipe in the first pipe section, and the heat dissipation pipe is limited only by the inner pipe and the barrel sleeved on the inner pipe and not having fins extending therefrom in the second pipe section;

[0021] Providing an end plate and an isolation plate, wherein a first through hole is formed in the isolation plate, and a second through hole coaxial with the first through hole is formed in the end plate, and an isolation cavity is defined between the end plate and the isolation plate via a sealing strip around their peripheries;

[0022] Inserting the heat dissipation pipe into the first through hole and the second through hole in sequence, so that the first through hole receives the second pipe section of the heat dissipation pipe, and the second through hole receives the first pipe section of the heat dissipation pipe;

[0023] Welding and fixing the first tube section of the heat dissipation tube to the end plate at the distal surface of the end plate opposite to the isolation plate; and

[0024] A channel is defined on a distal surface of the end plate to communicate with the inner tube of the heat dissipation pipe.

[0025] Optionally, the first tube section of the heat dissipation tube is formed by removing a length of the outer tube from the end of the heat dissipation tube; and / or

[0026] The second tube section of the heat dissipation pipe is formed by removing the fin along a length of the heat dissipation pipe.

[0027] Optionally, the method further comprises applying a waterproof layer or an anti-corrosion layer or a filler in the isolation cavity.

[0028] Optionally, the waterproof layer or anti-corrosion layer or filler comprises paint, epoxy phenolic, or asphalt.

[0029] Optionally, the method further comprises filling the isolation cavity with pressurized inert gas.

[0030] Optionally, the method further comprises filling the isolation cavity with isolation fluid or flushing fluid.

[0031] Optionally, the isolation fluid includes lubricating oil or liquid paraffin.

[0032] Optionally, the waterproof layer or anti-corrosion layer or filler is heated and applied to the isolation cavity in a liquid state so that the waterproof layer or anti-corrosion layer or filler covers the entire inner wall of the isolation cavity, and after excess liquid waterproof layer or anti-corrosion layer or filler is discharged from the isolation cavity, the liquid waterproof layer or anti-corrosion layer or filler remaining in the isolation cavity is dried to form the waterproof layer or anti-corrosion layer or filler.

[0033] Optionally, the channel is defined by fixing an end cover component on a distal surface of the end plate after the first tube section of the heat dissipation tube is fixed to the end plate by welding.

[0034] According to another aspect of the present application, an industrial air cooling device is also provided, which includes a plurality of the aforementioned heat dissipation units, a pipeline that fluid-tightly connects the internal fluid channels of the plurality of heat dissipation units to each other, and a blower.

[0035] By adopting the above-mentioned technical means of the present application, the liquid-tight connection between the heat dissipation pipe and the end plate is ensured by the isolation cavity structure, which improves the corrosion resistance against water vapor containing salt, increases the service life of the heat dissipation unit or cooling device, reduces the replacement frequency of the heat dissipation unit, and significantly improves the production efficiency of the system used by the industrial cooling device. In addition, the structure of the isolation cavity and the waterproof or anti-corrosion layer or filler therein is simple, so that the production cost of the heat dissipation unit does not increase significantly, and it can be suitable for large-scale production of heat dissipation units while ensuring resistance to salt corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The principles and various aspects of the present application can be more fully understood from the following detailed description in conjunction with the following drawings. It should be noted that the scales of the drawings may be different for the purpose of clear description, but this will not affect the understanding of the present application. In the drawings:

[0037] Figure 1 The overall block diagram of an industrial air cooling device is schematically shown;

[0038] Figure 2 A heat dissipation unit used in an industrial air cooling device is schematically shown;

[0039] Figure 3 is a partial cutaway view of a heat dissipation unit viewed from below;

[0040] Figure 4 is a partial cutaway side view of the heat dissipation unit;

[0041] Figure 5 is from Figure 3 The end view of the two ends of the heat dissipation unit seen through the section line of FIG. 1 , wherein the dotted rectangular frame in the figure simplifies and represents the omitted part of the heat dissipation pipe of the heat dissipation unit;

[0042] Figure 6 yes Figure 5 An enlarged cross-sectional view of the circled portion B in FIG.

[0043] Figure 7 schematically shows a cross-sectional view of a heat pipe; and

[0044] Figure 8 The flowchart schematically shows a method for manufacturing a heat dissipation unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0045] In the various figures of the present application, features with the same structure or similar functions are represented by the same reference numerals.

[0046] Figure 1 The overall block diagram of an industrial air cooling device 100 is schematically shown. It should be clear that in the context of the present application, an industrial air cooling device refers to an air cooling device used to cool process fluids (such as steam, lubricating fluid, hydraulic oil, etc.) in industrial fields such as petroleum, chemical industry, and electric power. This industrial air cooling device can be used as a component of a related large-scale process equipment / system. As shown in the figure, the industrial air cooling device 100 generally includes a plurality of heat dissipation units 10, a pipeline 20 that connects the internal fluid channels of these heat dissipation units 10 to each other in a liquid-tight manner, and a blower 30 for allowing ambient air to be sucked in and flowed through the outer surface of each heat dissipation unit 10. For example, each heat dissipation unit 10, each pipeline 20 and the blower 30 can be arranged on a (not shown) frame. In addition, each heat dissipation unit 10 and the frame can be equipped with adjustable shutters to adjust the flow rate and direction of the air blown. When the industrial air cooling device 100 is in operation, the process fluid is guided through the internal fluid passages of each heat dissipation unit 10, and the heat of the process fluid is conducted outward through the outer surface of the heat dissipation unit 10 and is cooled by the ambient air blowing therethrough.

[0047] Figure 2 The schematic diagram shows the arrangement structure of the heat dissipation units 10 used in the industrial air cooling device 100. The heat dissipation units 10 are arranged side by side or stacked with sufficient gaps between each other, and pipelines 20 ( Figure 2(not shown) so that the internal fluid channels of each heat dissipation unit 10 are connected to each other. Figure 3 , which schematically shows a partial cross-sectional view of a heat dissipation unit 10 viewed from below. Figure 4 is with Figure 3 The corresponding partial cut-away side view of the heat dissipation unit 10. It should be clear that: Figure 4 Only a part of the heat dissipation unit 10 is schematically shown. Figure 5 is from Figure 3 The end view of the two ends of the heat dissipation unit seen through the section line, the dotted rectangular box in the figure simplifies the omitted part of the heat dissipation pipe of the heat dissipation unit, and Figure 6 yes Figure 5 An enlarged cross-sectional view of the circled portion B in FIG.

[0048] like Figure 3 and 4 As shown, the heat dissipation unit 10 includes an end plate 11. The end plate 11 can be made of, for example, a corrosion-resistant metal plate such as a stainless steel plate. A plurality of heat dissipation tubes 40 are arranged substantially parallel to each other and perpendicular to the end plate 11, thereby forming a plurality of rows of heat dissipation tubes 40 (for example, four tube rows are schematically shown in the figure). The heat dissipation tubes 40 in each tube row are arranged at intervals substantially on a straight line parallel to the length direction of the end plate 11. Although in Figure 3 and 4 Only one end plate 11 is shown in the figure, but it should be clear to those skilled in the art that each heat dissipation unit 10 may include two end plates 11 disposed opposite to each other. The two end plates 11 are respectively connected to the opposite ends of each heat dissipation tube 40. Therefore, any description below about the end plate 11 and / or the portion connected between the end plate 11 and the heat dissipation tube 40 can be considered to cover both ends of the heat dissipation tube 40.

[0049] As shown in the figure, an end cover component 50 is arranged on the distal surface of the end plate 11. In the illustrated embodiment, the end cover component 50 is generally formed by bending a plate into a groove shape, and can extend along the longitudinal length of the end plate 11. It should be clear that components of other shapes that can realize the technical solution of the present application can also be implemented as end cover components. In the context of the present application, the term "proximal side" or "proximal surface" related to the end plate 11 refers to the side or surface on the same side as the main part (such as the fin) of the heat dissipation tube 40; on the contrary, the term "distal side" or "distal surface" related to the end plate 11 refers to the side or surface opposite to the main part (such as the fin) of the heat dissipation tube 40. For example, the end cover component 50 can also be made of corrosion-resistant metal. The end cover component 50 can be, for example, welded to the distal surface of the end plate 11, thereby defining a channel 51 between the end plate 11 and the end cover component 50 that is connected to the hollow internal fluid of each heat dissipation tube 40. For clarity, the end cover component 50 is Figure 41 is only partially shown in the length direction of the end plate 11. It should be understood that the end shield member 50 can be closed at both ends in the length direction, so that the channel 51 and the hollow interior of each heat dissipation tube 40 constitute an internal fluid channel for the heat dissipation unit 10. The pipeline 20 used to connect the internal fluid channels of each heat dissipation unit 10 can, for example, take the form of a separate pipe, and such a pipe can be fixed to the end shield member 50 of the heat dissipation unit 10 by a suitable method such as welding, threaded joints, etc. In alternative embodiments, components of other shapes can also be fixed on the distal surface of the end plate 11, as long as such a component of such shape can define a similar channel 51 thereon.

[0050] It is clear to those skilled in the art that each heat dissipation pipe 40 generally includes an inner pipe 41 and an outer pipe 42, wherein the inner pipe 41 is made of, for example, a corrosion-resistant metal such as stainless steel, and the outer pipe 42 is made of, for example, a metal having high thermal conductivity and corrosion resistance such as aluminum. In addition, in order to increase the contact area with the ambient air and improve the heat dissipation performance, the outer pipe 42 is also provided with fins extending radially outward. Generally, the outer pipe 42 is formed by winding an aluminum strip pre-formed with fins in a spiral manner on the outer surface of the inner pipe 41. Figure 7 As shown, the outer tube 42 is sleeved on the inner tube 41 and is composed of a barrel 42a directly in contact with the inner tube 41 and fins 42b radially extending from the outer surface of the barrel 42a. In one embodiment of the present application, the fins 42b extend around the outer surface of the barrel 42a in a spiral manner, for example.

[0051] Therefore, it is preferred that the arrangement of each heat dissipation tube 40 is such that their respective fins are not in contact and affected. In the prior art, when manufacturing the heat dissipation unit, the inner tube of each heat dissipation tube is exposed at its end and inserted into a through hole pre-formed in the end plate; and the edge of the through hole of the end plate is welded to the edge of the tube mouth of the heat dissipation tube only from the distal surface of the end plate, and then the end cover component is fixedly installed to form a channel. In fact, at the proximal surface of the end plate opposite to the distal surface, the inner wall of the through hole only keeps contact with the inner tube of the heat dissipation tube without any connection. This is because the presence of the fins of the heat dissipation tube makes it impossible to perform welding work on the proximal surface of the end plate. After the water vapor containing excess salt blown by the blower for cooling has been in contact with the proximal surface of the end plate for a long time, the inner tube is prone to stress corrosion at the proximal surface due to the gap that may exist between the inner tube and the end plate.

[0052] According to an embodiment of the present application, a separation plate 12 is provided on the inner side (or near side) of the end plate 11. For example, the separation plate 12 can be formed of the same material as the end plate 11. A plurality of through holes 11a (in the inner side) of the end plate 11 are formed. Figure 6Only one is visible in the figure), and the same number of through holes 12a can be formed in the isolation plate 12. The through holes 11a and 12a are aligned with each other. In addition, the end plate 11 and the isolation plate 12 are parallel to each other and separated by a certain distance, such as 10mm, 20mm, 30mm or more. A sealing strip 13 is provided around the periphery of the end plate 11 and the isolation plate 12 (at Figure 6 1 . A portion of the sealing strip 13 is shown in FIG. 1 . For example, the sealing strip 13 can be welded to the periphery of the end plate 11 and the isolation plate 12 to define the isolation chamber 15 therebetween. For another example, the sealing strip 13 can also be fixed around the periphery of the end plate 11 and the isolation plate 12 using a fastening device such as a screw.

[0053] It should be clear that for each heat dissipation unit 10, the isolation chamber 15 and the channel 51 are isolated from each other. In addition, a connecting pipe 16 is provided on the sealing strip 13. The tube cavity of the connecting pipe 16 is connected to the isolation chamber 15. For example, each heat dissipation unit 10 can be equipped with at least two such connecting pipes 16. For another example, the isolation chambers 15 of each heat dissipation unit 10 can be connected to each other via these connecting pipes 16. For example, when assembling these heat dissipation units 10, these connecting pipes 16 can be aligned with each other at the pipe mouths and welded or connected via threaded joints or the like or each sealed with a plug. The design of the connecting pipe 16 allows a suitable fluid (as described below) to enter and exit the isolation chamber 15.

[0054] The diameter of the through hole 12a formed in the isolation plate 12 is larger than the diameter of the through hole 11a formed in the end plate 11, wherein the diameter of the through hole 11a is set so that the inner tube 41 of the heat dissipation tube 40 can be smoothly inserted into the through hole 11a, and the diameter of the through hole 12a is set so that the cylinder 42a of the outer tube 42 of the heat dissipation tube 40 can be inserted into the through hole 12a. In the assembled heat dissipation unit 10, the aluminum cylinder 42a of the outer tube 42 of the heat dissipation tube 40 extends a distance from the isolation plate 12 toward the end plate 11 in the isolation chamber 15, but has not yet reached the end plate 11.

[0055] According to the embodiment of the present application, the presence of the isolation plate 12 blocks most of the water vapor containing excessive salts that is blown through the fins 42b of the heat dissipation tube 40 by the blower 30, which helps to reduce the possibility of corrosion on the proximal surface of the end plate 11 and also helps to reduce the occurrence of adverse stress corrosion on the proximal surface of the inner tube 41. The diameter of the through hole 12a can be configured to be slightly smaller than the outer diameter of the barrel 42a of the outer tube 42 of the heat dissipation tube 40, so that when the aluminum barrel 42a is inserted into the through hole 12a and inserted as shown in FIG. Figure 6After being positioned in the state shown, because the hardness of aluminum is less than the hardness of the isolation plate 12, the outer surface of the cylinder 42a is squeezed and deformed in the through hole 12a to seal any possible gap between the inner wall of the through hole 12a and the outer surface of the cylinder 42a, thereby preventing any corrosive water vapor from penetrating through the gap to the proximal surface treatment of the end plate 11 and causing adverse corrosion.

[0056] According to one embodiment of the present application, for each heat dissipation unit 10, a pressurized inert gas such as nitrogen can be filled into the entire isolation cavity 15 by using a connecting pipe 16 to improve the corrosion resistance of the proximal surface of the end plate 11. For example, the inert gas can be filled into the isolation cavity 15 at a pressure of approximately 10 mBar. This is because even if there is any gap between the inner wall of the through hole 12a of the isolation plate 12 and the cylinder 42a of the outer tube 42 of the heat dissipation tube 40, under the action of the pressurized inert gas, any water vapor will be prevented from penetrating into the isolation cavity 15 and corroding the proximal surface of the end plate 11 as much as possible.

[0057] According to another embodiment of the present application, for each heat dissipation unit 10, an isolation fluid or flushing fluid such as lubricating oil or liquid paraffin can be filled into the isolation cavity 15 by using a connecting pipe 16. For example, paraffin is filled into the isolation cavity 15 in a liquid state, and after solidification, it can effectively seal the gap between the end plate 11, the isolation plate 12 and the heat dissipation pipe 40, thereby improving the corrosion resistance. For another example, when the air cooling device 100 is working, the isolation fluid or flushing fluid is circulated through the isolation cavity 15 of each heat dissipation unit 10, which can not only prevent water vapor containing excessive salt (such as rainwater, rainwater containing chloride ions or water mist, etc.) from penetrating into the isolation cavity 15, thereby avoiding corrosion of the proximal surface of the partition 11, but also can be used as a refrigerant to take away the heat of the process fluid flowing in the internal fluid channel of the heat dissipation unit 10, thereby further improving the heat dissipation effect of the heat dissipation unit 10. The flushing fluid can be, for example, rainwater, rainwater containing chloride ions or water mist for flushing, so as to avoid the isolation cavity 15 from being damaged due to long-term salt corrosion.

[0058] According to a preferred embodiment of the present application, for each heat dissipation unit 10, a waterproof layer or an anti-corrosion layer or filler is formed in the inner wall of the isolation chamber 15. For example, the waterproof layer or anti-corrosion layer of the present application can be a waterproof layer or an anti-corrosion layer such as an asphalt layer, a paint layer, an epoxy resin layer, etc. For example, when the inner tube 41 of the heat dissipation pipe 40 has been welded to the end plate 11 and the isolation chamber 15 has been formed, the molten asphalt is poured into the isolation chamber 15 by using the connecting pipe 16, and stays for a sufficient time (for example, 1 hour or longer or shorter), and optionally accompanied by turning the heat dissipation unit 10 back and forth and left and right so that the asphalt is sufficient to cover the entire inner wall in the isolation chamber 15. The filled asphalt can be left in the isolation chamber 15 to solidify. Optionally, a part of the filled asphalt can also be discharged through the connecting pipe 16 in a molten state, and the remaining part completely covers the inner wall of the isolation chamber 15 and solidifies to form an asphalt layer. In this way, every certain period of time (for example, about 3 to 10 years), a suitable amount of melted asphalt can be refilled into the isolation cavity 15 and solidified to enhance the waterproof or anti-corrosion effect.

[0059] In another embodiment, paint can be filled into the isolation chamber 15. For example, after the liquid paint is filled into the isolation chamber 15, it can stay for a sufficient time, such as 1 hour, longer or shorter, so that the liquid paint covers the entire inner wall of the isolation chamber 15, thereby filling any possible gaps in the proximal surface of the end plate 11, especially any possible gaps between the inner wall of the sealing through hole 12a and the outer surface of the cylinder 42a. After waiting for the paint to dry, a waterproof layer or an anti-corrosion layer is formed on the inner wall of the isolation chamber 15 to prevent the salt in the water vapor from penetrating into the end plate 11 through any possible gaps in the isolation plate 12, thereby improving the corrosion resistance of the heat dissipation unit 10 and increasing its service life. For example, the waterproof layer or anti-corrosion layer or filler is heated and applied to the isolation cavity 15 in a liquid state so that the liquid waterproof layer or anti-corrosion layer or filler covers the entire inner wall of the isolation cavity 15, and after the excess liquid waterproof layer or anti-corrosion layer or filler is discharged from the isolation cavity 15, the waterproof layer or anti-corrosion layer or filler remaining in the isolation cavity 15 is dried to form a waterproof layer or anti-corrosion layer or filler.

[0060] Then, in order to ensure long-term corrosion resistance, liquid paint can be refilled and dried at regular intervals (e.g., 3 to 5 years) to re-reinforce the previously formed waterproof layer. For example, liquid paint can be filled into the isolation chamber 15 at a temperature less than or equal to 120 degrees. In an alternative embodiment, the paint can also be replaced by epoxyphenolic; in this case, epoxyphenolic can be filled into the isolation chamber 15 in a liquid state at a temperature less than 205 degrees. In an additional embodiment, during the process of forming a waterproof layer or an anti-corrosion layer, a light source can be used to irradiate or expose the outer side of the isolation plate 12 so that the paint or epoxyphenolic dries as quickly as possible and forms a waterproof layer or an anti-corrosion layer. In a preferred embodiment, when a waterproof layer or an anti-corrosion layer has been formed, a pressurized (e.g., 10mBar) inert gas such as nitrogen can be filled into the entire isolation chamber 15 using a connecting pipe 16 to further improve the reliability of waterproofing or anti-corrosion. In the above embodiments, the layer or filler formed by materials such as paint, epoxy phenolic, asphalt, etc. can be called a waterproof or anti-corrosion layer or filler.

[0061] Figure 8 A flow chart of a method for manufacturing a heat dissipation unit according to an embodiment of the present application is schematically shown. In step S10, a heat dissipation tube 40, an end plate 11 and an isolation plate 12 are prepared. For example, a plurality of heat dissipation tubes 40 may be prepared and two end plates 11 and two isolation plates 12 may be prepared, wherein a plurality of through holes 11a are formed in each end plate 11, and a plurality of through holes 12a are also formed in each isolation plate 12. Each end plate 11 conforms to the contour of each isolation plate 12, and the number of through holes of each end plate 11 is the same and they are coaxial when the end plate 11 and the isolation plate 12 are neatly fitted to each other. A sealing strip 13 is fixed around the periphery of an end plate 11 and an isolation plate 12 to define an isolation chamber 15 between them. In addition, at least two connecting tubes 16 are configured to the isolation chamber 15 to communicate with its fluid. For example, the connecting tube 16 extends from the sealing strip 13, for example.

[0062] Each heat dissipation tube 40 includes, for example, an inner tube 41 made of corrosion-resistant metal and an outer tube 42 made of heat-conducting metal and sleeved on the inner tube 41, wherein the outer tube includes a barrel 42a and fins 42b radially extending from the outer surface of the barrel 42a. The outer tube 42 extends substantially along the entire length of the inner tube 41. The outer diameter of the inner tube 41 is substantially equal to or slightly smaller than the inner diameter of the through hole 11a, and the outer diameter of the barrel 42a of the outer tube 42 is substantially equal to or slightly smaller than the inner diameter of the through hole 12a. The heat dissipation tube 40 includes at least a first tube section and an adjacent second tube section. The first tube section has a first end (e.g., Figure 6The heat dissipation pipe 40 is a section of the heat dissipation pipe 40 extending from the end portion (the end portion connected to the channel 51 shown) toward the other opposite end portion of the heat dissipation pipe 40. The heat dissipation pipe 40 is defined only by the inner pipe 41 in the first pipe section, and is defined only by the inner pipe 41 and the cylinder 42a sleeved on the inner pipe 41 and not having the fins 42b extending therefrom in the second pipe section.

[0063] For example, by using a suitable machining method such as turning, the fin 42b of the outer tube 42 at the end of each heat dissipation tube 40 (for example, the fin 42b extending along the spiral line on the outer surface of the cylinder 42a) is cut off along the axial direction of the tube by a certain length, so that the cylinder 42a of the outer tube 42 is exposed. In addition, the exposed cylinder 42a is further removed along the axial direction of the tube by a certain length, so that the inner tube 42 is exposed. In this way, the above-mentioned first tube section and second tube section of the heat dissipation tube 40 are defined.

[0064] In another alternative embodiment, during the manufacturing process of the heat dissipation tube 40, the first tube section of the heat dissipation tube 40 may be defined by not winding a length of aluminum strip pre-formed with fins for forming the outer tube 42 on the inner tube 41, and the second tube section of the heat dissipation tube 40 may be defined by winding a length of aluminum strip not pre-formed with fins on the inner tube 41. It should be clear to those skilled in the art that other methods of forming a heat dissipation tube having similar first and second tube sections may also be used here.

[0065] In step S20, one end of a plurality of heat dissipation tubes 40 is inserted into each through hole 12a of one isolation plate 12, and the other end is inserted into each through hole 12a in another isolation plate 12. For example, the one end of the heat dissipation tube 40 is sequentially inserted into the aligned or coaxial first through hole 12a and the second through hole 11a, so that the first through hole 12a receives the second pipe section of the heat dissipation tube 40, and the second through hole 11a receives the first pipe section of the heat dissipation tube 40. In this way, the barrel 42a of the outer tube 42 of each heat dissipation tube 40 is inserted into the through hole 12a of the corresponding isolation plate 12, and the exposed inner tube 41 of the heat dissipation tube 40 is located in the through hole 11a of the end plate 11, so that the opening edge of the inner tube 41 is at least flush with the edge of the through hole 11a of the end plate 11 on the far side surface or slightly protrudes. Finally, the fin 42b of the heat dissipation tube 40 is located between the two isolation plates 12, and the two end plates 11 are respectively located on the outside of the two isolation plates 12. The diameter of the first through hole 12a is slightly larger than the outer diameter of the cylinder 42a so that the cylinder 42a can pass through the first through hole 12a. Here, the outer diameter of the cylinder 42a refers to the outer diameter of the outer surface of the cylinder 42a (without considering the fins 42b). According to one embodiment, the difference between the diameter of the first through hole 12a and the outer diameter of the cylinder 42a is between 0.5 mm and 1 mm.

[0066] In step S30, the inner tube 41 of each heat dissipation tube 40 is fixed to the two end plates 11 at both ends by welding. For example, the inner tube 41 and the flush edges of the through hole 11a are welded on the far side surface of each end plate 11.

[0067] In step S40, an end cap member 50 is fixed to the distal surface of each end plate 11, for example, by welding, so as to form a channel 51 between the distal surface of the end plate 11 and the end cap member 50, which can be fluidically connected to the hollow interior of each heat dissipation pipe 40. The channels 51 of each heat dissipation unit 10 can be fluidically connected to each other via an additional pipeline (such as the above-mentioned pipeline 20).

[0068] In step S50, a waterproof or anti-corrosion layer or filler is formed in the isolation chamber 15 by using the connecting pipe 16. For example, the waterproof or anti-corrosion layer or filler can refer to the embodiments described above.

[0069] It should be clear to those skilled in the art that the above-mentioned step S50 and step S40 may be reversed in order. In addition, the waterproof or anti-corrosion layer or filler is re-formed at regular intervals. Alternatively or additionally, an isolation fluid or flushing fluid such as lubricating oil or liquid paraffin may be filled into the isolation chamber 15 using the connecting pipe 16. Alternatively or additionally, a pressurized inert gas such as nitrogen may be filled into the entire isolation chamber 15 using the connecting pipe 16.

[0070] The heat dissipation unit manufactured by the above method of the present application overcomes the problem in the prior art that the sealing of the end plate cannot be ensured near the heat dissipation fins due to the long heat dissipation pipe, which in turn causes the salt in the water vapor to easily corrode the end plate, thereby improving the service life and reliability of the heat dissipation unit. In addition, although according to the technical solution of the present application, the barrel 42a and / or the fins 42b of the heat dissipation pipe 40 are exposed to the ambient air at the proximal surface or outside of the end plate 11, the outer pipe 42 is made of a metal with high thermal conductivity and corrosion resistance, and thus does not affect the overall corrosion resistance of the heat dissipation unit.

[0071] Although the specific embodiments of the present application are described in detail herein, they are provided only for the purpose of explanation and should not be considered to limit the scope of the present application. In addition, it should be clear to those skilled in the art that the various embodiments described in this specification can be used in combination with each other. Various replacements, changes and modifications can be conceived without departing from the spirit and scope of the present application.

Claims

1. A heat dissipation unit (10) of an industrial air cooling device, the heat dissipation unit (10) comprising: A plurality of heat dissipation tubes (40), each of the plurality of heat dissipation tubes (40) comprising an inner tube (41) and an outer tube (42) at least partially sleeved on the inner tube (41), the outer tube (42) comprising a cylinder (42a) and fins (42b) extending from the outer surface of the cylinder (42a), An end plate (11) and an isolation plate (12) are arranged at at least one end of the plurality of heat dissipation tubes (40), an isolation cavity (15) is defined between the end plate (11) and the isolation plate (12) via a sealing strip (13) surrounding their peripheries, the end plate (11) comprising a proximal surface close to the fin (42b) and an opposite distal surface, and a channel (51) is defined on the distal surface of the end plate (11) to be fluidically connected to the inner tube (41) of the heat dissipation tube (40) and isolated from the isolation cavity (15), wherein the barrel (42a) of the heat dissipation tube (40) has at least a section of length passing through the isolation plate (12), so that the isolation plate (12) is located between the fin (42b) and the end plate (11), and the inner tube (41) is welded to the end plate (11) at the distal surface.

2. The heat dissipation unit (10) according to claim 1, characterized in that: A waterproof layer or an anti-corrosion layer or a filler is applied in the isolation cavity (15).

3. The heat dissipation unit (10) according to claim 2, characterized in that: The waterproof layer or anti-corrosion layer or filler comprises paint, epoxy phenolic, or asphalt.

4. The heat dissipation unit (10) according to claim 3, characterized in that: The heat dissipation unit (10) further comprises a connecting pipe (16) for applying the waterproof layer or the anti-corrosion layer or the filler into the isolation cavity (15).

5. The heat dissipation unit (10) according to claim 4, characterized in that: A first through hole (12a) is formed in the isolation plate (12), and a second through hole (11a) coaxial with the first through hole (12a) is formed in the end plate (11), the diameter of the first through hole (12a) is larger than the diameter of the second through hole (11a), and the first through hole (12a) receives the cylinder (42a) of the heat dissipation pipe (40), and the second through hole (11a) receives the inner tube (41) of the heat dissipation pipe (40).

6. The heat dissipation unit (10) according to claim 5, characterized in that: The diameter of the first through hole (12a) is slightly larger than the outer diameter of the cylinder (42a), so that the cylinder (42a) can pass through the first through hole (12a).

7. The heat dissipation unit (10) according to claim 6, characterized in that: The difference between the diameter of the first through hole (12a) and the outer diameter of the cylinder (42a) is between 0.5 mm and 1 mm.

8. The heat dissipation unit (10) according to any one of claims 1 to 7, characterized in that: The isolation chamber (15) is filled with pressurized inert gas.

9. The heat dissipation unit (10) according to any one of claims 1 to 7, characterized in that: The isolation chamber (15) is filled with isolation fluid or flushing fluid.

10. The heat dissipation unit (10) according to claim 9, characterized in that: The isolation fluid includes lubricating oil or liquid paraffin.

11. The heat dissipation unit (10) according to any one of claims 1 to 7, characterized in that: The passage (51) is defined by an end cap member (50) fixed on the distal surface of the end plate (11).

12. A method for manufacturing a heat dissipation unit (10) for an industrial air cooling device, comprising: A heat dissipation pipe (40) is provided, wherein the heat dissipation pipe (40) comprises an inner pipe (41) and an outer pipe (42) sleeved on the inner pipe (41), wherein the outer pipe (42) comprises a barrel (42a) and fins (42b) extending from the outer surface of the barrel (42a), and the heat dissipation pipe (40) comprises at least a first pipe section and an adjacent second pipe section, wherein the first pipe section has a length extending from one end of the heat dissipation pipe (40) toward the other end opposite to the heat dissipation pipe (40), wherein the heat dissipation pipe (40) is defined only by the inner pipe (41) in the first pipe section, and wherein the heat dissipation pipe (40) is defined only by the inner pipe (41) and the barrel (42a) sleeved on the inner pipe (41) and not having fins (42b) extending therefrom in the second pipe section; An end plate (11) and an isolation plate (12) are provided, wherein a first through hole (12a) is formed in the isolation plate (12), and a second through hole (11a) coaxial with the first through hole (12a) is formed in the end plate (11), and an isolation cavity (15) is defined between the end plate (11) and the isolation plate (12) via a sealing strip (13) surrounding their peripheries; Inserting the heat dissipation pipe (40) into the first through hole (12a) and the second through hole (11a) in sequence, so that the first through hole (12a) receives the second pipe section of the heat dissipation pipe (40), and the second through hole (11a) receives the first pipe section of the heat dissipation pipe (40); The first pipe section of the heat dissipation pipe (40) is fixed to the end plate (11) by welding at the distal surface of the end plate (11) opposite to the isolation plate (12); and A channel (51) is defined on the distal surface of the end plate (11) to communicate with the inner tube (41) of the heat dissipation tube (40).

13. The method according to claim 12, characterized in that The first tube section of the heat dissipation tube (40) is formed by removing a length of the outer tube (42) from the end of the heat dissipation tube (40); and / or The second pipe section of the heat dissipation pipe (40) is formed by removing the fin (42b) along a length of the heat dissipation pipe (40).

14. The method according to claim 13, characterized in that The method also includes applying a waterproof layer or an anti-corrosion layer or a filler in the isolation cavity (15).

15. The method according to claim 14, characterized in that The waterproof layer or anti-corrosion layer or filler comprises paint, epoxy phenolic, or asphalt.

16. The method according to any one of claims 13 to 15, characterized in that: It also includes filling the isolation chamber (15) with pressurized inert gas.

17. The method according to any one of claims 13 to 15, characterized in that: The isolation chamber (15) is also filled with isolation fluid or flushing fluid.

18. The method according to claim 17, wherein the isolation fluid comprises lubricating oil or liquid paraffin.

19. The method according to claim 15, characterized in that The waterproof layer or anti-corrosion layer or filler is heated and applied in liquid form into the isolation cavity (15) so that the liquid waterproof layer or anti-corrosion layer or filler covers the entire inner wall of the isolation cavity (15), and after excess liquid waterproof layer or anti-corrosion layer or filler is discharged from the isolation cavity (15), the liquid waterproof layer or anti-corrosion layer or filler remaining in the isolation cavity (15) is dried to form the waterproof layer or anti-corrosion layer or filler.

20. The method according to claim 19, characterized in that The channel (51) is defined by fixing the end cover member (50) on the distal surface of the end plate (11) after the first pipe section of the heat dissipation pipe (40) is fixed to the end plate (11) by welding.

21. An industrial air cooling device, comprising a plurality of heat dissipation units (10) according to any one of claims 1 to 11, a pipeline (20) for fluid-tightly connecting the internal fluid channels of the plurality of heat dissipation units (10), and a blower (30).

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