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

Abstract

The present application discloses an industrial air cooling device and a heat dissipation unit thereof, the heat dissipation unit comprising: an end plate having a proximal surface and a distal surface opposite to each other, and a through-hole extending between the proximal surface and the distal surface; an end shield member disposed on a distal surface of the end plate to define a channel; the heat dissipation pipe is provided with an inner pipe and an outer pipe, the inner pipe is at least partially sleeved with the outer pipe, the outer pipe is provided with a barrel and fins extending from the outer surface of the barrel, and the end of the heat dissipation pipe is located in a through hole in the end. The end plate is provided with a channel and a fin, the channel is communicated with an inner tube fluid of the radiating tube, the fin is adjacent to the near side surface, the barrel is provided with an expanded joint section located in the through hole, and the inner tube is welded to the orifice edge of the through hole at the far side surface of the end plate.

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] an end plate having a proximal surface and a distal surface opposite to each other and a through hole extending therebetween;

[0008] an end cap member disposed on a distal surface of the end plate to define a passage; and

[0009] A heat dissipation pipe, the heat dissipation pipe having an inner pipe and an outer pipe at least partially sleeved on the inner pipe, and the outer pipe having a barrel and fins extending from the outer surface of the barrel, the end of the heat dissipation pipe is located in a through hole at the end so that the channel is in fluid communication with the inner pipe of the heat dissipation pipe and the fins are adjacent to the proximal surface, the barrel has an expansion section located in the through hole, and the inner pipe is welded to the orifice edge of the through hole at the distal surface of the end plate.

[0010] Optionally, the through hole has a first hole section adjacent to the distal surface and a second hole section adjacent to the proximal surface. In the through hole, the inner tube is in direct contact with the inner wall of the first hole section, and the outer surface of the cylinder is in direct contact with the inner wall of the second hole section to form the expansion section, so that the expansion section isolates the proximal surface from the first hole section in a liquid-tight manner.

[0011] Optionally, the outer tube is made of a softer material than the inner tube and the end plates.

[0012] Optionally, the expansion sections are distributed along the entire circumference of the cylinder.

[0013] Optionally, the longitudinal length of the expansion section is at least 3 cm.

[0014] Optionally, the expansion section extends from the proximal surface toward the distal surface in the second hole section.

[0015] 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:

[0016] 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 cylinder and fins extending from the outer surface of the cylinder, 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 cylinder sleeved on the inner pipe and not having fins extending therefrom in the second pipe section;

[0017] providing an end plate having a proximal surface and a distal surface opposite to each other and a through hole extending therebetween;

[0018] Inserting the one end of the heat dissipation pipe into the through hole of the end plate along the direction from the proximal surface toward the distal surface, so that the fin is adjacent to the proximal surface, and at least a portion of the inner tube of the first pipe segment and at least a portion of the barrel of the second pipe segment in the through hole are in direct contact with the inner wall of the through hole;

[0019] The inner surface of the inner tube of the second tube section is subjected to a radially outward force in the through hole, so that the cylinder body is at least partially deformed radially outward in the through hole to produce an expansion section located in the through hole;

[0020] welding the inner tube of the first tube section to the orifice edge of the through hole at the distal surface of the end plate; and

[0021] A channel is defined on a distal surface of the end plate to communicate with the inner tube fluid of the heat dissipation pipe.

[0022] Optionally, the through hole has a first hole section adjacent to the distal surface and a second hole section adjacent to the proximal surface, the inner tube is in direct contact with the inner wall of the first hole section, and the outer surface of the cylinder is in direct contact with the inner wall of the second hole section to form the expansion section, so that the expansion section isolates the proximal surface from the first hole section in a liquid-tight manner.

[0023] Optionally, the outer tube is made of a softer material than the inner tube and the end plates.

[0024] Optionally, the production of the expansion section is completed before or after the welding of the inner tube.

[0025] Optionally, the passage is defined by securing an end cap member to a distal surface of the end plate.

[0026] Optionally, the longitudinal length of the expansion section is at least 3 cm.

[0027] Optionally, the expansion section extends from the proximal surface toward the distal surface in the second hole section.

[0028] Optionally, the expansion section is produced by:

[0029] A radial expansion device provided with an expansion head is used to apply a radial outward force to the inner surface of the inner tube of the second tube section at a position corresponding at least partially to the second hole section, wherein the expansion head extends from the distal surface into the inner tube to reach the area where the position is located in a radially contracted state, and the expansion head is operated to be in a radially outward expanded state, thereby applying a radial outward force to the inner surface of the inner tube.

[0030] 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

[0031] The second tube section of the heat dissipation pipe is formed by removing the fin along a length of the heat dissipation pipe.

[0032] Optionally, before the expansion section is produced, the inner diameter of the second hole section is slightly larger than the outer diameter of the barrel of the second pipe section, and the difference between the inner diameter of the second hole section and the outer diameter of the barrel of the second pipe section is in the range of 0.6 mm to 1 mm.

[0033] 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.

[0034] By adopting the above-mentioned technical means of the present application, any possible gap between the heat dissipation pipe and the near side surface of the end plate is filled by squeezing the pressure section of the cylinder, thereby improving the corrosion resistance of the heat dissipation pipe on the near side surface of the end plate against water vapor containing salt, increasing the service life of the heat dissipation unit or cooling device, reducing the replacement frequency of the heat dissipation unit, and significantly improving the production efficiency of the system used by the industrial cooling device. In addition, the structure of the isolation layer 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

[0035] 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:

[0036] Figure 1The overall block diagram of an industrial air cooling device is schematically shown;

[0037] Figure 2 A heat dissipation unit used in an industrial air cooling device is schematically shown;

[0038] Figure 3 is a partial cutaway view of a heat dissipation unit viewed from below;

[0039] Figure 4 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;

[0040] Figure 5 yes Figure 4 An enlarged cross-sectional view of the circled portion B in FIG.

[0041] Figure 6 schematically shows a cross-sectional view of a heat pipe; and

[0042] Figure 7 The flowchart schematically shows a method for manufacturing a heat dissipation unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0043] In the various figures of the present application, features with the same structure or similar functions are represented by the same reference numerals.

[0044] 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.

[0045] Figure 2The 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 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 5 yes Figure 4 An enlarged cross-sectional view of the circled portion B in FIG.

[0046] 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.

[0047] 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 groove-shaped. 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 "inside" or "proximal surface" related to the end plate 11 refers to the side or surface on the same side as the main part of the heat dissipation pipe 40 (such as the fin); on the contrary, the term "distal" or "distal surface" related to the end plate 11 refers to the side or surface opposite to the main part of the heat dissipation pipe 40 (such as the fin). 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 pipe 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.

[0048] 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 6 As shown, the outer tube 42 is sleeved on the inner tube 41 and is composed of a cylinder 42a directly in contact with the inner tube 41 and fins 42b radially extending from the outer surface of the cylinder 42a. In one embodiment, the fins 42b extend along a spiral line around the outer surface of the cylinder 42a.

[0049] 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 operations on the proximal surface of the end plate. After the water vapor containing excessive salt used for cooling blown by the blower is in contact with the proximal surface of the end plate for a long time, the inner tube at the proximal surface will also be corroded due to the gap between it and the end plate.

[0050] According to one embodiment of the present application, a plurality of through holes 11a are formed in the end plate 11 (in Figure 5Only one is visible in the figure). Each through hole 11a extends from the distal surface 11D of the end plate 11 to the proximal surface 11P of the end plate 11. In addition, each through hole 11a has a first hole section 11b and a second hole section 11c along the thickness direction of the end plate 11, wherein the first hole section 11b is close to the distal surface 11D of the end plate 11, and the second hole section 11c is close to the proximal surface 11P of the end plate 11. The diameter of the first hole section 11b is smaller than the diameter of the second hole section 11c, and the diameter of the first hole section 11b is approximately equal to the diameter of the inner tube 41, and the diameter of the second hole section 11c is slightly larger than or equal to the outer diameter of the cylinder 42a. As shown in the figure, the end of the heat dissipation pipe 40 is inserted into the through hole 11a so that the channel 51 is in fluid communication with the hollow interior of the heat dissipation pipe 40. The end of the heat dissipation pipe 40 inserted into the through hole 11a has a length of the inner tube 41 directly contacting the inner wall of the first hole section 11b, and also has a length of the outer surface of the cylinder 42a directly contacting the inner wall of the second hole section 11c. In this way, the cylinder 42a of the outer tube 42 of the heat dissipation pipe 40 at least partially extends into the through hole 11a in the axial direction of the through hole 11a.

[0051] According to an embodiment of the present application, at least in the second hole section 11c, the inner tube 41 applies force radially outward, so that the cylinder 42a is squeezed and deformed along the entire circumference in the second hole section 11c, thereby causing any possible gap between the through hole 11a and the cylinder 42a in the proximal surface 11P of the end plate 11 to be closed, so as to prevent the water vapor containing salt from penetrating therefrom. In this way, the cylinder 42a has an expansion section or a pressure section located in the through hole 11a, and the expansion section is generated between the outer surface of the inner tube 41 and the inner wall of the through hole 11a, especially the inner wall of the second hole section 11c. The expansion section is produced because the material of the cylinder 42a is relatively soft, and after being subjected to the radial extrusion force from the inside to the outside, it expands and deforms radially outward, and because the radial extrusion force is distributed along the entire circumference of the cylinder 42a, preferably evenly distributed, the corresponding part of the cylinder 42a that expands and deforms outward is also distributed along the entire circumference of the cylinder 42a, preferably evenly distributed, thereby ensuring the liquid-tight isolation between the proximal surface 11P and the first hole section 11b. The expansion section ensures the liquid-tight isolation between the proximal surface 11P and the first hole section 11b; that is, water vapor cannot penetrate and corrode the first hole section 11b from the outside of the proximal surface 11P (for example, the side where the fin is located). In order to ensure sufficient sealing at the proximal surface 11P of the end plate 11, the longitudinal length of the expansion section (the length measured along the axial direction of the through hole 11a) is preferably at least 3 cm.

[0052] According to a preferred embodiment of the present application, the region of the cylinder 42a that is deformed by the radially outward pressure (or the above-mentioned expansion section) at least covers the orifice edge of the second hole section 11c on the proximal surface 11P of the end plate 11. On the distal surface 11D of the end plate 11, the inner tube 41 is fixed to the first hole section 11b by a circle of welds. For example, the orifice edge of the inner tube 41 can be flush with the orifice edge of the first hole section 11b on the distal surface 11D, and the weld extends circumferentially along the flush edges.

[0053] With respect to the heat dissipation unit 10 of the present application, since any possible gaps between the heat dissipation pipe 40 and the end plate 11 on the proximal surface 11P of the end plate 11 and the opposite distal surface 11D are eliminated (for example, through the expansion section and the weld of the cylinder 42a, respectively), it is possible to significantly reduce the penetration of water vapor containing salt into the end plate 11 through the proximal surface 11P of the end plate 11 and corrode the heat dissipation pipe 40 and the end plate 11, thereby improving the corrosion resistance of the heat dissipation unit 10 in a water vapor environment containing salt.

[0054] Figure 7 The flowchart of the manufacturing method of the heat dissipation unit according to one embodiment of the present application is schematically shown. In step S10, the heat dissipation pipe 40 and the end plate 11 are prepared. For example, a plurality of heat dissipation pipes 40 can be prepared and two end plates 11 are prepared, wherein a plurality of through holes 11a are formed in each end plate 11 so that each through hole 11a has a first hole section 11b close to the distal surface 11D of the end plate 11 and a second hole section 11c close to the proximal surface 11P of the end plate 11. In one embodiment, in order to facilitate the subsequent insertion of one end of the heat dissipation pipe 40 from the proximal surface 11P into the through hole 11a, the length of the first hole section 11b is greater than the length of the second hole section 11c.

[0055] According to an embodiment of the present application, the heat dissipation pipe 40 is prepared using an inner pipe 41 made of corrosion-resistant metal and an outer pipe 42 sleeved on the inner pipe 41 and made of heat-conducting metal. In a preferred embodiment, the material of the outer pipe 42 is softer than the material of the inner pipe 41 and the end plate 11. The outer pipe includes a cylinder 42a and fins 42b extending along a spiral line radially extending from the outer surface of the cylinder 42a. The outer pipe 42 extends substantially along the entire length of the inner pipe 41. The outer diameter of the inner pipe 41 is slightly smaller than or equal to the inner diameter of the first hole section 11b, and the outer diameter of the cylinder 42a is slightly smaller than or equal to the inner diameter of the second hole section 11c.

[0056] According to an embodiment of the present application, the heat dissipation pipe 40 is configured to include at least a first pipe section and an adjacent second pipe section. The first pipe section has a first end portion (e.g., Figure 5The heat dissipation pipe 40 is a section of the heat dissipation pipe 40 extending from the end portion (the end portion close to the distal surface 11D shown) toward the other opposite end portion. 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 extended therefrom in the second pipe section.

[0057] 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 for a certain length, so that a certain length of the outer surface of the cylinder 42a of the outer tube 42 is exposed; in addition, the cylinder 42a is also removed along the axial direction of the tube for a certain length by machining, so that a certain length of the inner tube 41 is exposed. In this way, the above-mentioned first tube section and second tube section of the heat dissipation tube 40 are defined.

[0058] 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.

[0059] In step S20, the end of the heat dissipation pipe 40 is inserted into the through hole 11a of the end plate 11 from the proximal surface 11P toward the distal surface 11D of the end plate 11, so that the inner tube 41 of the first tube section of the heat dissipation pipe 40 is inserted into the first hole section 11b of the through hole 11a and the cylinder 42a of the second tube section of the heat dissipation pipe 40 is at least partially inserted into the second hole section 11c of the through hole 11a. In the second hole section 11c of the through hole 11a, the cylinder 42a contacts the inner wall of the second hole section 11c along the circumferential direction. According to an embodiment of the present application, the heat dissipation pipe 40 is substantially perpendicular to the end plate 11. In a preferred embodiment, in order to facilitate the insertion of the heat dissipation pipe 40, especially its cylinder 42a, into the second hole section 11c, the second hole section 11c can be formed in a manner of slightly narrowing from the proximal surface 11c toward the distal surface 11b.

[0060] In step S30, a radial expansion device is inserted into the inner tube 41 from the distal surface 11D of the end plate 11 so that the expansion head of the radial expansion device can reach the corresponding area where the second hole section 11c contacts the cylinder 42a. It should be clear to those skilled in the art that the radial expansion device can be any common or achievable device form in the mechanical field. For example, the expansion head is arranged in the radial expansion device. The expansion head has a radially outward expansion state and a radially contracted state. In the radially contracted state, the expansion head can extend into the inner tube 41 and reach the area where the position at least partially corresponds to the second hole section (11c). In the radially outward expansion state, the expansion head can contact the inner wall of the inner tube 41 along the circumference at this area and apply a radially outward expansion force to the inner tube 41.

[0061] In order to ensure that the barrel 42a of the second pipe section can be smoothly inserted into the second hole section 11c and the expansion section can produce reliable liquid tightness here, before the expansion section is produced, the inner diameter of the second hole section 11c is slightly larger than the outer diameter of the barrel 42a of the second pipe section, and the difference between the inner diameter of the second hole section 11c and the outer diameter of the barrel 42a of the second pipe section is in the range between 0.6 mm and 1 mm, and further in the range between 0.3 mm and 0.5 mm.

[0062] In step S40, the expansion head of the radial expansion device is operated to be in a radially outward expansion state, so that the inner tube 41 is subjected to a radially outward expansion force on the inner wall, thereby causing the cylinder 42a to be squeezed or even deformed by the outer wall of the inner tube 41 in the second hole section 11c, so as to eliminate any possible gap between the cylinder 42a at the proximal surface 11P of the end plate 11 and the second hole section 11c. In this way, the expansion section of the cylinder 42a is formed.

[0063] In step S50, a circumferential weld is formed between the outer surface of the inner tube 41 and the edge of the hole of the first hole section 11b by welding, so that the heat dissipation tube 40 is fixed relative to the end plate 11. It should be clear to those skilled in the art that the order of the above steps S40 and S50 can be reversed on the premise that the radial expansion device can work.

[0064] In step S60, an end cap member 50 is fixed to the distal surface 11D of each end plate 11, for example, by welding, so as to form a channel 51 between the distal surface 11D of the end plate 11 and the end cap member 50, which can be fluidically connected to the hollow interior of the heat dissipation pipe 40. The channels 51 of each heat dissipation unit 10 can be fluidically connected to each other via an additional pipeline (for example, the above-mentioned pipeline 20).

[0065] The heat dissipation unit manufactured by the 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. 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 tube 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. In addition, the method of the present application can be relatively simple to implement in production practice, and can improve the production efficiency of the cooling device.

[0066] 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: an end plate (11), the end plate (11) having a proximal surface (11P) and a distal surface (11D) opposite to each other, and a through hole (11a) extending therebetween; an end cap member (50) disposed on a distal surface (11D) of the end plate (11) to define a passage (51); as well as A heat dissipation pipe (40), the heat dissipation pipe (40) comprising an inner pipe (41) and an outer pipe (42) at least partially sleeved on the inner pipe (41), the outer pipe (42) comprising a cylinder (42a) and fins (42b) extending from the outer surface of the cylinder (42a), the end of the heat dissipation pipe (40) being located in a through hole (11a) of the end (11) so that the channel (51) is fluidically connected to the inner pipe (41) of the heat dissipation pipe (40) and the fins (42b) are adjacent to the proximal surface (11P), the cylinder (42a) comprising an expansion section located in the through hole (11a), and the inner pipe (41) being welded to the orifice edge of the through hole (11a) at the distal surface (11D) of the end plate (11).

2. The heat dissipation unit (10) according to claim 1, characterized in that: The through hole (11a) has a first hole section (11b) adjacent to the distal surface (11D) and a second hole section (11c) adjacent to the proximal surface (11P). In the through hole (11a), the inner tube (41) is in direct contact with the inner wall of the first hole section (11b), and the outer surface of the cylinder (42a) is in direct contact with the inner wall of the second hole section (11c) to form the expansion section, so that the expansion section isolates the proximal surface (11P) from the first hole section (11b) in a liquid-tight manner.

3. The heat dissipation unit (10) according to claim 2, characterized in that: The outer tube (42) is made of a material softer than the inner tube (41) and the end plate (11).

4. The heat dissipation unit (10) according to claim 3, characterized in that: The expansion sections are distributed along the entire circumference of the cylinder (42a).

5. The heat dissipation unit (10) according to claim 4, characterized in that: The longitudinal length of the expansion section is at least 3 cm.

6. The heat dissipation unit (10) according to any one of claims 1 to 5, characterized in that: The expansion section extends in the second hole section (11c) from the proximal surface (11P) toward the distal surface (11D).

7. A method for forming 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 opposite end of 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; Providing an end plate (11) having a proximal surface (11P) and a distal surface (11D) opposite to each other, and a through hole (11a) extending therebetween; Inserting the one end of the heat dissipation pipe (40) into the through hole (11a) of the end plate (11) along the direction from the proximal surface (11P) toward the distal surface (11D), so that the fin (42b) is adjacent to the proximal surface (11P), and at least a portion of the inner tube (41) of the first tube section and at least a portion of the barrel (42a) of the second tube section in the through hole (11a) are in direct contact with the inner wall of the through hole (11a); The inner surface of the inner tube (41) of the second tube section is subjected to a radially outward force in the through hole (11a), so that the cylinder (42a) is at least partially deformed radially outward in the through hole (11a), thereby generating an expansion section located in the through hole (11a); Welding the inner tube (41) of the first tube section to the orifice edge of the through hole (11a) at the distal surface (11D) of the end plate (11); and A channel (51) is defined on a distal surface (11D) of the end plate (11) to be in fluid communication with the inner tube (41) of the heat dissipation tube (40).

8. The method according to claim 7, characterized in that The through hole (11a) has a first hole section (11b) adjacent to the distal surface (11D) and a second hole section (11c) adjacent to the proximal surface (11P), the inner tube (41) is in direct contact with the inner wall of the first hole section (11b), and the outer surface of the cylinder (42a) is in direct contact with the inner wall of the second hole section (11c) to form the expansion section, so that the expansion section isolates the proximal surface (11P) from the first hole section (11b) in a liquid-tight manner.

9. The method according to claim 8, characterized in that The outer tube (42) is made of a material softer than the inner tube (41) and the end plate (11).

10. The method according to claim 9, characterized in that The production of the expansion section is completed before or after the welding of the inner tube (41).

11. The method according to claim 10, characterized in that The passage (51) is defined by fixing an end cap member (50) on a distal surface (11D) of the end plate (11).

12. The method according to claim 11, characterized in that The longitudinal length of the expansion section is at least 3 cm.

13. The method according to any one of claims 7 to 12, characterized in that: The expansion section extends in the second hole section (11c) from the proximal surface (11P) toward the distal surface (11D).

14. The method according to any one of claims 8 to 12, characterized in that: The expansion section is produced in the following manner: A radial expansion device provided with an expansion head is used to apply a radially outward force to the inner surface of the inner tube (41) of the second tube section at a position corresponding at least partially to the second hole section (11c), wherein the expansion head extends from the distal surface (11D) into the inner tube (41) to the area where the position is located in a radially contracted state, and the expansion head is operated to be in a radially outward expanded state, thereby applying a radially outward force to the inner surface of the inner tube (41).

15. The method according to any one of claims 8 to 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).

16. The method according to any one of claims 8 to 12, characterized in that: Before the expansion section is produced, the inner diameter of the second hole section (11c) is slightly larger than the outer diameter of the barrel (42a) of the second pipe section, and the difference between the inner diameter of the second hole section (11c) and the outer diameter of the barrel (42a) of the second pipe section is in the range between 0.6 mm and 1 mm.

17. An industrial air cooling device, comprising a plurality of heat dissipation units (10) according to any one of claims 1 to 6, 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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