Industrial air cooling device, heat dissipation unit thereof, 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: a plurality of heat dissipation pipes, each of the plurality of heat dissipation pipes (40) having an inner pipe (41) and an outer pipe at least partially sleeved on the inner pipe, the outer pipe (42) having a cylinder and fins extending from the outer surface of the cylinder (42a), an end plate (11) and a partition plate (12) provided at at least one end of the plurality of heat dissipation pipes (40), a partition cavity (15) being defined between the end plate (11) and the partition plate (12) via a sealing strip (13) around the periphery thereof, the end plate (11) comprising a proximal surface close to the fins (42b) and an opposite distal surface, and a passage (51) being defined on the distal surface of the end plate (11) to be in fluid communication with the inner pipe (41) of the heat dissipation pipe (40) and isolated from the partition cavity (15), wherein the cylinder (42a) of the heat dissipation pipe (40) has at least a length passing through the partition plate (12), so that the partition plate (12) is located between the fins (42b) and the end plate (11), and the inner pipe (41) is welded to the end plate (11) at the distal surface.

Description

TECHNICAL FIELD

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

[0002] Air cooling devices (also referred to as air coolers) are widely used in the petroleum, chemical, and power industries to cool various process fluids such as steam, lubricating liquid, hydraulic oil, etc. Generally, such air cooling devices are composed of a plurality of heat dissipation units, and the internal fluid passages of the heat dissipation units are in fluid communication with each other so that the process fluid input from the inlet of the air cooling device can flow through the fluid passages and be cooled before being discharged from the outlet of the air cooling device. Each heat dissipation unit is arranged with a plurality of heat dissipation tubes in parallel to form the internal fluid passage of the heat dissipation unit, and the outer surface of the heat dissipation tubes is in contact with air. In order to increase the contact area between the outer surface of the heat dissipation tubes and air, helical fins can be provided on the outer surface of the heat dissipation tubes. In addition, in order to increase the flow rate of air to enhance the heat dissipation effect, a blower can be provided in the air cooling device to drive air to flow through the helical fins.

[0003] These heat dissipation tubes are generally long, and they are parallel to each other. Therefore, for each heat dissipation unit, both ends of all the heat dissipation tubes can be connected by end plates, and passages are provided on the end plates to allow the hollow interiors of the heat dissipation tubes to be in fluid communication with the passages and thus form the internal fluid passage of the heat dissipation unit. Generally, the edge of the tube opening of each heat dissipation tube is welded to the edge of the opening formed on the end plate to ensure the structural connection between the heat dissipation tube and the end plate and the liquid-tight connection between the hollow interior of the heat dissipation tube and the passage provided on the end plate. However, due to the presence of the fins of the heat dissipation tubes, the heat dissipation tubes can only be welded on the side of the end plate where the passage is located when the heat dissipation unit is manufactured. That is, on the side of the end plate opposite to where the passage is located (i.e., the side exposed to the fins), there must be a gap between the edge of the opening of the end plate and the outer surface of the heat dissipation tube.

[0004] When the air cooling device is used in an environment with a high salt content in the air water vapor (for example, in a seaside environment), as the air used to cool the fluid flowing through the hollow interiors of the heat dissipation tubes continuously contacts the outer surface of the heat dissipation tubes, water vapor containing excessive salt will enter the above-mentioned gap, thereby causing corrosion to occur between the heat dissipation tube and the end plate at the above-mentioned gap, and long-term corrosion in turn affects the liquid-tightness between the heat dissipation tube and the end plate. In addition, due to the presence of the fins of the heat dissipation tubes, welding cannot be performed at the above-mentioned gap when the heat dissipation unit is assembled. SUMMARY

[0005] In view of the above technical problems, the present application aims to provide an improved industrial cooling device, as well as a heat dissipation unit for such a cooling device, and a manufacturing method of the heat dissipation unit, so as to avoid the situation that the liquid tightness is not up to the standard due to the corrosion of the gap between the heat dissipation pipe and the end plate of the heat dissipation unit by the water vapor containing salt.

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

[0007] a plurality of heat dissipation pipes, each of the plurality of heat dissipation pipes having an inner pipe and an outer pipe at least partially sleeved on the inner pipe, the outer pipe having a cylinder and fins extending from an outer surface of the cylinder,

[0008] an end plate and a partition plate provided at at least one end of the plurality of heat dissipation pipes, a partition cavity being defined between the end plate and the partition plate via a sealing strip around their periphery, the end plate comprising a proximal surface close to the fins and an opposite distal surface, and a passage being defined on the distal surface of the end plate to be in fluid communication with the inner pipe of the heat dissipation pipe and isolated from the partition cavity, wherein the cylinder of the heat dissipation pipe has at least one length passing through the partition plate, so that the partition plate is located between the fins and the end plate, and the inner pipe 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 partition cavity.

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

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

[0012] Optionally, a first through hole is formed in the partition 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 greater than that 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 pipe of the heat dissipation pipe.

[0013] Optionally, the diameter of the first through hole is slightly greater than the 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 partition cavity is filled with pressurized inert gas.

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

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

[0018] Optionally, the channel is defined by an end cover member fixed on the 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] providing a 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 an outer surface of the barrel, and the heat dissipation pipe comprising at least a first pipe section having a length extending from one end of the heat dissipation pipe towards an opposite end of the heat dissipation pipe, and an adjacent second pipe section, the heat dissipation pipe in the first pipe section being defined only by the inner pipe, and the heat dissipation pipe in the second pipe section being defined by the inner pipe and the barrel sleeved on the inner pipe without the fins extending thereon;

[0021] providing an end plate and an isolation plate, the isolation plate having a first through hole formed therein, and the end plate having a second through hole formed therein coaxial with the first through hole, an isolation chamber being defined between the end plate and the isolation plate via a sealing strip around their periphery;

[0022] inserting the heat dissipation pipe into the first through hole and the second through hole in sequence, such 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 the first pipe section of the heat dissipation pipe to the end plate at a distal surface of the end plate opposite to the isolation plate; and

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

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

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

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

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

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

[0030] Optionally, the method further comprises filling the isolated cavity with an isolating fluid or a flushing fluid.

[0031] Optionally, the isolating fluid comprises lubricating oil or liquid paraffin.

[0032] Optionally, the water-proof or corrosion-proof layer or filler is heated to be in liquid state and applied into the isolated cavity so that the water-proof or corrosion-proof layer or filler covers all the inner walls of the isolated cavity, and after the excess liquid water-proof or corrosion-proof layer or filler is drained out of the isolated cavity, the liquid water-proof or corrosion-proof layer or filler remaining in the isolated cavity is dried to form the water-proof or corrosion-proof layer or filler.

[0033] Optionally, the channel is defined by fixing an end cover member on the distal surface of the end plate after the first pipe segment of the heat dissipation pipe is fixed to the end plate by welding.

[0034] According to another aspect of the present application, there is also provided an industrial air cooling device, comprising a plurality of the aforementioned heat dissipation units, a pipeline fluidically connecting the internal channels of the plurality of heat dissipation units to each other, and a blower.

[0035] With the above technical means of the present application, the fluidic connection between the heat dissipation pipe and the end plate is ensured by the isolated cavity structure, the corrosion resistance to water vapor containing salt is improved, the service life of the heat dissipation unit or the cooling device is increased, the replacement frequency of the heat dissipation unit is reduced, and the production efficiency of the system to which the industrial cooling device is applied is significantly improved. In addition, the structure of the isolated cavity and the water-proof or corrosion-proof layer or filler therein is simple, so that the production cost of the heat dissipation unit does not increase significantly, and on the premise of ensuring the salt corrosion resistance, the heat dissipation unit can be mass-produced. BRIEF DESCRIPTION OF DRAWINGS

[0036] The principles and various aspects of the present application can be better understood with respect to the following detailed description along with the accompanying drawings. It is noted that the proportions of the various drawings are likely not to scale for the purpose of clear illustration, but this will not affect the understanding of the present application. In the drawings:

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

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

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

[0040] Figure 4 is a partial sectional side view of the heat dissipating unit;

[0041] Figure 5 is a sectional view of the heat dissipating unit taken along the line Figure 3 in the drawing, the dotted rectangular frame in the drawing simplifies the omitted part of the heat dissipating pipe representing the heat dissipating unit;

[0042] Figure 6 is an enlarged sectional view of the circled part B in Figure 5

[0043] Figure 7 schematically shows a sectional view of one heat dissipating pipe; and

[0044] Figure 8 schematically shows a flow chart of a manufacturing method of the heat dissipating unit according to one embodiment of the present application. DETAILED DESCRIPTION

[0045] In the drawings of the present application, features of the same structure or function are denoted by the same reference numerals.

[0046] Figure 1 schematically shows a general block diagram of an industrial air cooling device 100. It is to be noted that, in the context of the present application, the industrial air cooling device refers to an air cooling device used in the petroleum, chemical, power and other industrial fields for cooling process fluids (such as steam, lubricating liquid, hydraulic oil, etc.). Such industrial air cooling device can be used as a component of a related large process equipment / system. As shown, the industrial air cooling device 100 generally comprises a plurality of heat dissipating units 10, pipes 20 fluidically connecting the internal fluid passages of the heat dissipating units 10 to each other, and a blower 30 for sucking and flowing ambient air over the outer surfaces of the heat dissipating units 10. For example, the heat dissipating units 10, the pipes 20 and the blower 30 can be arranged on a (not shown) frame. In addition, the heat dissipating units 10 and the frame can be equipped with adjustable louvers to adjust the flow and direction of the blown air. When the industrial air cooling device 100 is in operation, process fluids are guided through the internal fluid passages of the heat dissipating units 10, and the heat of the process fluids is conducted outward through the outer surfaces of the heat dissipating units 10 and cooled by the blown ambient air.

[0047] Figure 2 schematically shows the arrangement of the heat dissipating units 10 employed in the industrial air cooling device 100. The heat dissipating units 10 are arranged side by side or stacked with sufficient gaps therebetween, and the pipes 20 (see Fig. 2) can be arranged at both ends of each heat dissipating unit 10, for example. Figure 2 ​(Not shown), so that the internal fluid channels of each heat dissipation unit 10 are interconnected. Further reference Figure 3 The diagram schematically shows a partial cross-sectional view of a heat dissipation unit 10 viewed from below. Figure 4 Is with Figure 3 A partial sectional side view of the corresponding heat dissipation unit 10. It is important to understand that... Figure 4 Only a portion of the heat dissipation unit 10 is shown schematically. Figure 5 From Figure 3 The end views of the two ends of the heat dissipation unit are shown through a section line. The dashed rectangle in the figure simplifies and represents the omitted portion of the heat dissipation pipes of the heat dissipation unit. Figure 6 yes Figure 5 An enlarged sectional view of the circled portion B in the diagram.

[0048] like Figure 3 and 4 As shown, the heat dissipation unit 10 includes an end plate 11. This end plate 11 can be made of, for example, a corrosion-resistant metal sheet such as stainless steel. A plurality of heat dissipation pipes 40 are arranged perpendicularly to the end plate 11, generally parallel to each other, thus forming multiple rows of heat dissipation pipes 40 (e.g., four rows are schematically shown in the figure). The individual heat dissipation pipes 40 in each row are spaced apart approximately 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, but those skilled in the art will understand that each heat dissipation unit 10 may include two end plates 11 disposed opposite to each other. These two end plates 11 are respectively connected to opposite ends of each heat pipe 40. Therefore, any description below regarding the end plates 11 and / or the portions connecting the end plates 11 to the heat pipes 40 can be considered to cover both ends of the heat pipes 40.

[0049] As shown in the figure, an end cover member 50 is provided on the distal surface of the end plate 11. In the illustrated embodiment, the end cover member 50 is generally made of sheet metal bent into a groove shape and can extend along the longitudinal length of the end plate 11. It should be understood that other shapes of members that can realize the technical solutions of this application can also be implemented as end cover members. In the context of this application, the term "proximal" or "proximal surface" referring to the end plate 11 refers to the side or surface on the same side as the main part (e.g., fins) of the heat sink 40; conversely, the term "distal" or "distal surface" referring to the end plate 11 refers to the side or surface opposite to the main part (e.g., fins) of the heat sink 40. For example, the end cover member 50 can also be made of a corrosion-resistant metal. The end cover member 50 can be welded to the distal surface of the end plate 11, for example, thereby defining a channel 51 between the end plate 11 and the end cover member 50 that is in fluid communication with the hollow interior of each heat sink 40. For clarity, the end cover member 50 in Figure 4The end cover member 50 is only partially shown in the length direction of the end plate 11. It should be understood that the end cover member 50 can be closed at both ends in the length direction, so that the passage 51 and the hollow interior of each heat pipe 40 constitute an internal fluid passage for the heat sink unit 10. The piping 20 for connecting the internal fluid passages of each heat sink unit 10 can take the form of separate pipes, for example, and such pipes can be fixed to the end cover member 50 of the heat sink unit 10 by suitable means such as welding, threaded joints, etc. In alternative embodiments, other shaped members can be fixed to the distal surface of the end plate 11, provided that such shaped members can define a similar passage 51 thereon.

[0050] As will be apparent to those skilled in the art, each heat pipe 40 generally comprises an inner pipe 41, for example made of a corrosion-resistant metal such as stainless steel, and an outer pipe 42, for example made of a metal such as aluminum having a high thermal conductivity and corrosion resistance. Furthermore, the outer pipe 42 is provided with fins extending radially outward in order to increase the contact area with ambient air and improve heat dissipation performance. Typically, the outer pipe 42 is formed by winding an aluminum strip, which is pre-formed with fins, in a spiral manner on the outer surface of the inner pipe 41. As shown in the cross-sectional view of Fig. 2, the outer pipe 42 is fitted over the inner pipe 41 and is composed of a cylindrical body 42a in direct contact with the inner pipe 41 and fins 42b extending radially from the outer surface of the cylindrical body 42a. In one embodiment of the present application, the fins 42b extend around the outer surface of the cylindrical body 42a, for example, in a spiral manner. Figure 7

[0051] Accordingly, the arrangement of each heat pipe 40 is preferably such that their respective fins do not contact each other. In the prior art, in manufacturing the heat sink unit, the inner pipe of each heat pipe is exposed at its end portion and inserted into a through-hole pre-formed in the end plate; and only the edge of the through-hole of the end plate and the edge of the mouth of the heat pipe are welded from the distal surface of the end plate, and the end cover member is then fixed to form the passage. In fact, at the proximal surface of the end plate, opposite the distal surface, only the inner wall of the through-hole is in contact with the inner pipe of the heat pipe without any connection. This is because the fins of the heat pipe prevent welding work from being performed at the proximal surface of the end plate. After long-term contact of the proximal surface of the end plate with the water vapor containing excess salt blown by the blower for cooling, the inner pipe is prone to stress corrosion at the proximal surface due to possible gaps between the inner pipe and the end plate.

[0052] According to the embodiment of the present application, a partition plate 12 is provided on the inner side (or proximal side) of the end plate 11. For example, the partition plate 12 can be formed of the same material as the end plate 11. A plurality of through-holes 11a (in the present embodiment, four through-holes 11a) are formed in the end plate 11, and the partition plate 12 is provided with through-holes 12a corresponding to the through-holes 11a of the end plate 11. The through-holes 11a of the end plate 11 and the through-holes 12a of the partition plate 12 are aligned with each other, and the inner pipes 41 of the heat pipes 40 are inserted into the aligned through-holes 11a and 12a. Figure 6 ​Only one of which is visible, and an equal number of through-holes 12a can be formed in the spacer plate 12. Each through-hole 11a and 12a is axially aligned with the other. In addition, the end plate 11 and the spacer plate 12 are parallel to and spaced apart from each other by a distance, for example, 10 mm, 20 mm, 30 mm, or more. A sealing strip 13 (in Figure 6 partially shown in FIG. 3) is wrapped around the periphery of the end plate 11 and the spacer plate 12. For example, the sealing strip 13 can be welded to the periphery of the end plate 11 and the spacer plate 12 to define the isolation volume 15 therebetween. For another example, the sealing strip 13 can also be secured around the periphery of the end plate 11 and the spacer plate 12 with fastening means such as screws.

[0053] It should be clear that for each heat sink unit 10, the isolation volume 15 and the channel 51 are isolated from each other. In addition, a communication tube 16 is provided on the sealing strip 13. The lumen of the communication tube 16 is in communication with the isolation volume 15. For example, each heat sink unit 10 can be equipped with at least two such communication tubes 16. For another example, the isolation volumes 15 of the heat sink units 10 can be in communication with each other via the communication tubes 16. For example, upon assembly of the heat sink units 10, the communication tubes 16 can be aligned with each other at their mouths and welded or connected via threaded joints or the like or each closed with a plug. The communication tube 16 is designed to allow the appropriate fluid (described below) to enter and exit the isolation volume 15.

[0054] The diameter of the through-hole 12a formed in the spacer plate 12 is larger than the diameter of the through-hole 11a formed in the end plate 11, where the diameter of the through-hole 11a is sized to allow the inner tube 41 of the heat pipe 40 to be inserted into the through-hole 11a and the diameter of the through-hole 12a is sized to allow the barrel 42a of the outer tube 42 of the heat pipe 40 to be inserted into the through-hole 12a. In the assembled heat sink unit 10, the aluminum barrel 42a of the outer tube 42 of the heat pipe 40 extends within the isolation volume 15 from the spacer plate 12 toward the end plate 11 a distance but has not yet reached the end plate 11.

[0055] According to embodiments of the present application, the presence of the spacer plate 12 blocks a substantial portion of the water vapor containing excess salt that is blown by the blower 30 over the fins 42b of the heat pipe 40, which helps to mitigate the likelihood of corrosion occurring on the proximal surface of the end plate 11 and also helps to mitigate the occurrence of adverse stress corrosion conditions at 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 pipe 40, such that when the aluminum barrel 42a is inserted into the through-hole 12a and is seated as shown in FIG. 3, the barrel 42a is in contact with the inner surface of the through-hole 12a. Figure 6After the state shown, the outer surface of the cylinder 42a is pressed against the through hole 12a due to the lower hardness of the aluminum than that of the isolation plate 12, so as to seal any gap that can exist between the inner wall of the through hole 12a and the outer surface of the cylinder 42a, and thus avoid any corrosive water vapor from penetrating to the proximal surface of the end plate 11 via the gap, causing adverse corrosion.

[0056] According to one embodiment of the present application, for each heat dissipation unit 10, the communication pipe 16 can be used to fill pressurized inert gas such as nitrogen into the entire isolation cavity 15, so as to improve the corrosion resistance at 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 about 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 pipe 40, the pressurized inert gas can prevent any water vapor from penetrating into the isolation cavity 15 and corroding the proximal surface of the end plate 11.

[0057] According to another embodiment of the present application, for each heat dissipation unit 10, the communication pipe 16 can be used to fill isolation fluid such as lubricating oil, liquid paraffin or flushing fluid into the isolation cavity 15. For example, the 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, and improve the corrosion resistance. For another example, during the operation of the air cooling device 100, the isolation fluid or flushing fluid is circulated through the isolation cavity 15 of each heat dissipation unit 10, which not only prevents water vapor containing excessive salt (such as rainwater, rainwater containing chlorine ions or water mist, etc.) from penetrating into the isolation cavity 15 and thus avoiding corrosion of the proximal surface of the end plate 11, but also can take away the heat of the process fluid flowing in the internal fluid passage of the heat dissipation unit 10 as a coolant, further improving the heat dissipation effect of the heat dissipation unit 10. The flushing fluid can be, for example, rainwater, rainwater containing chlorine ions or water mist, so as to avoid damage to the isolation cavity 15 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 a corrosion-proof layer or a filler is formed in the inner wall of the isolated cavity 15. For example, the waterproof layer or the corrosion-proof layer of the present application can be a layer of asphalt, a layer of paint, a layer of epoxy resin, or the like, which is capable of preventing water or preventing corrosion. For example, in the case where the inner tube 41 of the heat dissipation pipe 40 has been welded to the end plate 11 and the isolated cavity 15 has been formed, molten asphalt is filled into the isolated cavity 15 through the communication pipe 16, and is left for a sufficient time (e.g., 1 hour or longer or shorter), and optionally, the heat dissipation unit 10 is flipped front and back and left and right so that the asphalt sufficiently covers the entire inner wall of the isolated cavity 15. The filled asphalt can be left in the isolated cavity 15 to solidify. Alternatively, the filled asphalt can also be partially discharged from the communication pipe 16 in a molten state, while the remaining portion covers the entire inner wall of the isolated cavity 15 and solidifies to form a layer of asphalt. In this way, a suitable amount of molten asphalt can be filled into the isolated cavity 15 again and solidified every certain period of time (e.g., 3 to 10 years or so) to enhance the waterproof or corrosion-proof effect.

[0059] In another embodiment, paint can be filled into the isolated cavity 15. For example, liquid paint is filled into the isolated cavity 15 and is left for a sufficient time (e.g., 1 hour or longer or shorter) so that the liquid paint covers the entire inner wall of the isolated cavity 15, thereby filling any possible gaps between the proximal surface of the end plate 11 and 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 a corrosion-proof layer is formed on the inner wall of the isolated cavity 15 to resist the penetration of salt in the water vapor through any possible gaps of the isolation plate 12 to the end plate 11, thereby improving the corrosion resistance of the heat dissipation unit 10 and the service life. For example, the waterproof layer or the corrosion-proof layer or the filler is applied into the isolated cavity 15 in a heated liquid state so that the liquid waterproof layer or the corrosion-proof layer or the filler covers the entire inner wall of the isolated cavity 15, and after the excess liquid waterproof layer or the corrosion-proof layer or the filler is discharged from the isolated cavity 15, the waterproof layer or the corrosion-proof layer or the filler remaining in the isolated cavity 15 is dried to form a waterproof layer or a corrosion-proof layer or a filler.

[0060] Then, to ensure long-term corrosion resistance, the liquid paint can be refilled and dried at regular intervals (e.g., every 3 to 5 years) to reinforce the previously formed waterproof layer. For example, the liquid paint can be filled into the isolation cavity 15 at a temperature of less than or equal to 120 degrees Celsius. In an alternative embodiment, the paint can be replaced with epoxyphenolic resin; in this case, the epoxyphenolic resin can be filled into the isolation cavity 15 in a liquid state at a temperature of less than 205 degrees Celsius. In an additional embodiment, during the formation of the waterproof or anti-corrosion layer, the outside of the isolation plate 12 can be irradiated or exposed using a light source to allow the paint or epoxyphenolic resin to dry quickly and form the waterproof or anti-corrosion layer. In a preferred embodiment, after the waterproof or anti-corrosion layer has been formed, pressurized (e.g., 10 mBar) inert gas, such as nitrogen, can be injected into the entire isolation cavity 15 through the connecting pipe 16 to further improve the reliability of waterproofing or corrosion protection. In the above embodiments, the layer or filler formed by materials such as paint, epoxy phenolic resin, asphalt, etc., can be referred to as a waterproof or anti-corrosion layer or filler.

[0061] Figure 8 A flowchart illustrating a method for manufacturing a heat dissipation unit according to an embodiment of this application is shown schematically. In step S10, heat dissipation pipes 40, end plates 11, and isolation plates 12 are prepared. For example, a plurality of heat dissipation pipes 40 may be prepared, and two end plates 11 and two isolation plates 12 may be prepared, wherein each end plate 11 has a plurality of through holes 11a formed therein, and each isolation plate 12 also has a plurality of through holes 12a formed therein. The contours of each end plate 11 and each isolation plate 12 are matched, and the number of through holes is the same and they are coaxial when the end plates 11 and isolation plates 12 are neatly fitted together. A sealing strip 13 is fixed around the periphery of one end plate 11 and one isolation plate 12 to define an isolation cavity 15 between them. In addition, at least two connecting pipes 16 are disposed to the isolation cavity 15 for fluid communication therewith. For example, the connecting pipes 16 extend from the sealing strip 13.

[0062] Each heat sink 40 includes, for example, an inner tube 41 made of corrosion-resistant metal and an outer tube 42 made of thermally conductive metal fitted onto the inner tube 41. The outer tube includes a cylindrical body 42a and fins 42b extending radially from the outer surface of the cylindrical body 42a. The outer tube 42 extends approximately along the entire length of the inner tube 41. The outer diameter of the inner tube 41 is approximately equal to or slightly smaller than the inner diameter of the through-hole 11a, and the outer diameter of the cylindrical body 42a of the outer tube 42 is approximately equal to or slightly smaller than the inner diameter of the through-hole 12a. The heat sink 40 includes at least a first tube segment and an adjacent second tube segment. The first tube segment has a portion extending from one end of the heat sink 40 (e.g., as shown in the image). Figure 6extends a length towards the opposite other end of the heat dissipation pipe 40. The heat dissipation pipe 40 is defined by the inner pipe 41 only in the first pipe section, and by the inner pipe 41 and the cylinder 42a of the outer pipe 42 which is sleeved on the inner pipe 41 and does not extend the fins 42b in the second pipe section.

[0063] The fins 42b of the outer pipe 42 at the end of each heat dissipation pipe 40, such as the fins 42b extending along a helix on the outer surface of the cylinder 42a, are cut off a length along the axial direction of the pipe, for example by turning or other suitable machining method, so that the cylinder 42a of the outer pipe 42 is exposed. In addition, the already exposed cylinder 42a is further removed a length along the axial direction of the pipe, so that the inner pipe 42 is exposed. In this way, the above-mentioned first pipe section and second pipe section of the heat dissipation pipe 40 are defined.

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

[0065] In step S20, one end of each of the plurality of heat dissipation pipes 40 is inserted into each through hole 12a of one of the isolation plates 12, and the other end is inserted into each through hole 12a of another of the isolation plates 12. For example, the one end of the heat dissipation pipe 40 is sequentially inserted into the aligned or coaxial first through hole 12a and second through hole 11a, 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. In this way, the cylinder 42a of the outer pipe 42 of each heat dissipation pipe 40 is sleeved in the through hole 12a of the corresponding isolation plate 12, and the exposed inner pipe 41 of the heat dissipation pipe 40 is located in the through hole 11a of the end plate 11, so that the open edge of the inner pipe 41 is at least flush with or slightly protrudes from the edge on the distal surface of the through hole 11a of the end plate 11. Finally, the fins 42b of the heat dissipation pipe 40 are located between the two isolation plates 12, and the two end plates 11 are respectively located outside 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 an 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] At step S30, the inner tube 41 of each heat dissipation pipe 40 is fixed to the two end plates 11 at both ends by means of welding. For example, the flush edges of the inner tube 41 and the through hole 11a are welded on the distal surface of each end plate 11.

[0067] At step S40, an end cover member 50 is fixed on the distal surface of each end plate 11, for example by means of welding, so as to form a passage 51 between the distal surface of the end plate 11 and the end cover member 50, which is in fluid communication with the hollow interior of each heat dissipation pipe 40. The passages 51 of each heat dissipation unit 10 can be in fluid communication with each other via additional piping (for example the piping 20 described above).

[0068] At step S50, a waterproof or corrosion-proof layer or filler is formed within the isolation cavity 15 by means of the communication pipe 16. For example, the waterproof or corrosion-proof layer or filler can refer to the embodiments already described above.

[0069] It is clear to the person skilled in the art that the above steps S50 and S40 can also be reversed in order. Furthermore, the waterproof or corrosion-proof layer or filler is reformed at regular intervals. Alternatively or additionally, the isolation cavity 15 can be filled with an isolation fluid or flushing fluid, such as lubricating oil, liquid paraffin, by means of the communication pipe 16. Alternatively or additionally, the entire isolation cavity 15 can be filled with a pressurized inert gas, such as nitrogen, by means of the communication pipe 16.

[0070] The heat dissipation unit manufactured by means of the method described above overcomes the problem of the prior art, in which the length of the heat dissipation pipe makes it impossible to ensure the sealing of the end plate near the heat dissipation fins, thus causing the salt content of the water vapor to easily corrode the end plate, thus improving the service life and reliability of the heat dissipation unit. Furthermore, 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 or outside the proximal surface of the end plate 11, since the outer tube 42 is made of a metal having high thermal conductivity and corrosion resistance, the overall corrosion resistance of the heat dissipation unit is not affected.

[0071] Although specific embodiments of the present application are described in detail herein, they are merely for the purpose of explanation and should not be considered as limiting the scope of the present application. Furthermore, it is clear to the person skilled in the art that the various embodiments described in the present specification can be used in combination with each other. Various alternatives, modifications and improvements can be conceived without departing from the spirit and scope of the present application.

Claims

1. A heat dissipating unit (10) of an industrial air cooling device, the heat dissipating unit (10) comprising: a plurality of heat dissipating pipes (40), each of the plurality of heat dissipating pipes (40) having an inner pipe (41) and an outer pipe (42) at least partially sheathed on the inner pipe (41), the outer pipe (42) having a barrel (42a) in direct contact with the inner pipe (41) and fins (42b) extending in a helical manner from an outer surface of the barrel (42a), an end plate (11) and a partition plate (12) provided at at least one end of the plurality of heat dissipating pipes (40), a partition cavity (15) being defined between the end plate (11) and the partition plate (12) via a sealing strip (13) around their periphery, the end plate (11) comprising a proximal surface proximate to the fins (42b) and an opposite distal surface, and a passage (51) being defined on the distal surface of the end plate (11) to be in fluid communication with the inner pipe (41) of the heat dissipating pipe (40) and isolated from the partition cavity (15), wherein the barrel (42a) of the heat dissipating pipe (40) has at least a length passing through the partition plate (12) such that the partition plate (12) is located between the fins (42b) and the end plate (11), and the barrel (42a) extends a distance from the partition plate (12) towards the end plate (11) within the partition cavity (15) but has not yet reached the end plate (11), the inner pipe (41) being welded to the end plate (11) at the distal surface, each heat dissipating pipe (40) is formed to comprise at least a first pipe segment and an adjacent second pipe segment by cutting off a length of the aluminum fins (42b) of the outer pipe (42) at an end of each heat dissipating pipe (40) along an axial direction of the pipe to expose the aluminum barrel (42a) of the outer pipe (42), and further removing a length of the exposed barrel (42a) along the axial direction of the pipe to expose the inner pipe (41), or by defining the first pipe segment of the heat dissipating pipe (40) on the inner pipe (41) without winding a length of the aluminum strip pre-formed with fins to form the outer pipe (42), and defining the second pipe segment of the heat dissipating pipe (40) on the inner pipe (41) by winding a length of the aluminum strip not pre-formed with fins, the respective heat dissipating pipe (40) being defined only by the inner pipe (41) in the first pipe segment and by the inner pipe (41) and the barrel (42a) of the outer pipe (42) sheathed on the inner pipe (41) and not extended with fins (42b) in the second pipe segment, 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 greater than the diameter of the second through hole (11a), and the first through hole (12a) receives the second pipe section of the heat dissipation pipe (40), the second through hole (11a) receives the first pipe section of the heat dissipation pipe (40), the hardness of the cylinder (42a) is less than the hardness of the isolation plate (12), so that the outer surface of the cylinder (42a) is extruded and deformed when passing through the first through hole (12a), to seal any possible gap between the inner wall of the first through hole (12a) and the outer surface of the cylinder (42a) of the second pipe section.

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

3. The heat dissipating unit (10) according to claim 2, characterized in that The waterproof layer or the corrosion-resistant layer or the filler includes paint, epoxy phenolic, or asphalt.

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

5. The heat dissipating unit (10) according to claim 4, characterized in that The diameter of the first through hole (12a) is slightly smaller than the outer diameter of the cylinder (42a) of the second pipe section, so that the cylinder (42a) can pass through the first through hole (12a).

6. The heat dissipating unit (10) according to claim 5, characterized in that The difference between the diameter of the first through hole (12a) and the outer diameter of the cylinder (42a) of the second pipe section is between 0.5 mm and 1 mm.

7. The heat dissipating unit (10) according to any one of claims 1 to 6, characterized in that The isolation cavity (15) is filled with pressurized inert gas.

8. The heat dissipating unit (10) according to any one of claims 1 to 6, characterized in that The isolation cavity (15) is filled with an isolation fluid or a flushing fluid.

9. The heat dissipating unit (10) according to claim 8, characterized in that The isolation fluid includes lubricating oil or liquid paraffin.

10. The heat dissipating unit (10) according to any one of claims 1 to 6, characterized in that The channel (51) is defined by an end cover member (50) fixed on the distal surface of the end plate (11).

11. A method for manufacturing a heat dissipation unit (10) of an industrial air cooling device, comprising: A heat dissipation pipe (40) is provided, which has an inner pipe (41) and an outer pipe (42) sleeved on the inner pipe (41), the outer pipe (42) has a barrel (42a) in direct contact with the inner pipe (41) and fins (42b) extending in a spiral manner from the outer surface of the barrel (42a), and the heat dissipation pipe (40) at least includes a first pipe section and an adjacent second pipe section, the heat dissipation pipe (40) is formed to at least include a first pipe section and an adjacent second pipe section by cutting off the aluminum fins (42b) of the outer pipe (42) at the end of each heat dissipation pipe (40) by a certain length along the axial direction of the pipe to expose the barrel (42a) of the outer pipe (42), and further removing the exposed aluminum barrel (42a) by a certain length along the axial direction of the pipe to expose the inner pipe (41), or by not winding a length of aluminum strip pre-formed with fins to form the outer pipe (42) on the inner pipe (41) to define a first pipe section of the heat dissipation pipe (40), and winding a length of aluminum strip not pre-formed with fins on the inner pipe (41) to define a second pipe section of the heat dissipation pipe (40), the first pipe section has a length extending from one end of the heat dissipation pipe (40) towards the opposite end of the heat dissipation pipe (40), the heat dissipation pipe (40) is only defined by the inner pipe (41) in the first pipe section, the heat dissipation pipe (40) is only defined by the inner pipe (41) and the barrel (42a) sleeved on the inner pipe (41) and not extended with fins (42b) in the second pipe section; An end plate (11) and a partition plate (12) are provided, a first through hole (12a) is formed in the partition plate (12), and a second through hole (11a) coaxial with the first through hole (12a) is formed in the end plate (11), a partition cavity (15) is defined between the end plate (11) and the partition plate (12) via a sealing strip (13) around their periphery; The heat dissipation pipe (40) is inserted 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), the second through hole (11a) receives the first pipe section of the heat dissipation pipe (40), and the cylinder (42a) extends a distance from the isolation plate (12) to the end plate (11) in the isolation cavity (15) but has not yet reached the end plate (11), the diameter of the first through hole (12a) is greater than the diameter of the second through hole (11a), and the first through hole (12a) receives the second pipe section of the heat dissipation pipe (40), the second through hole (11a) receives the first pipe section of the heat dissipation pipe (40), the hardness of the cylinder (42a) is less than the hardness of the isolation plate (12), so that the outer surface of the cylinder (42a) is extruded and deformed when passing through the first through hole (12a), to seal any possible gap between the inner wall of the first through hole (12a) and the outer surface of the cylinder (42a) of the second pipe section; The first pipe section of the heat dissipation pipe (40) is welded and fixed to the end plate (11) at the far side surface of the end plate (11) opposite to the isolation plate (12); and A channel (51) is defined on the far side surface of the end plate (11) to communicate with the inner pipe (41) of the heat dissipation pipe (40).

12. The method of claim 11, wherein, The first pipe section of the heat dissipation pipe (40) is formed by removing a length of the outer pipe (42) from the end of the heat dissipation pipe (40); and / or The second pipe section of the heat dissipation pipe (40) is formed by removing the fins (42b) along a length of the heat dissipation pipe (40).

13. The method of claim 12, wherein, It also includes applying a waterproof layer or a corrosion-resistant layer or a filler in the isolation cavity (15).

14. The method of claim 13, wherein, The waterproof layer or the corrosion-resistant layer or the filler includes paint, epoxy phenolic, or asphalt.

15. The method according to any one of claims 12 to 14, characterized in that, It also includes filling the isolation cavity (15) with pressurized inert gas.

16. The method according to any one of claims 12 to 14, characterized in that, It also includes filling the isolation cavity (15) with an isolation fluid or a flushing fluid.

17. The method of claim 16, wherein the isolation fluid includes lubricating oil or liquid paraffin.

18. The method of claim 14, wherein, The waterproof layer or the corrosion-resistant layer or the filler is heated to be applied in a liquid state to the isolation cavity (15) so that the liquid waterproof layer or the corrosion-resistant layer or the filler covers all the inner walls of the isolation cavity (15), and after the excess liquid waterproof layer or the corrosion-resistant layer or the filler is discharged from the isolation cavity (15), the liquid waterproof layer or the corrosion-resistant layer or the filler remaining in the isolation cavity (15) is dried to form the waterproof layer or the corrosion-resistant layer or the filler.

19. The method of claim 18, wherein, The channel (51) is defined by fixing an end cover member (50) on the far side surface of the end plate (11) after the first pipe section of the heat dissipation pipe (40) is welded and fixed to the end plate (11).

20. An industrial air cooling device comprising a plurality of the heat radiating units (10) according to any one of claims 1 to 10, a piping (20) fluidly connecting the internal flow passages of the plurality of the heat radiating units (10) to each other in a liquid-tight manner, and a blower (30).

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