Fin type heat exchange unit, heat exchanger and machining device and machining method of fin type heat exchange unit and heat exchanger

Abstract

The invention relates to a fin type heat exchange unit, a heat exchanger and a machining device and method of the fin type heat exchange unit, the fin type heat exchange unit comprises base tubes and fins installed on the base tubes, and the number N of the base tubes is larger than or equal to 2; each fin comprises mounting holes, the number of the mounting holes corresponds to that of the base tubes, and the circle centers of the mounting holes are distributed on the fins along the same circumference; the base tube is in a spiral shape, and the fins are arranged on the base tube in a sleeved mode through the installation holes so that a stacked fin group can be formed on the base tube. The fins of the fin type heat exchange unit are sleeved on the base tube when the base tube is in a linear shape, then the base tube sleeved with the fins is deformed into a spiral shape through torsion, and finally the fins are connected with the base tube in a welding mode, so that the installation difficulty of the fins is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, specifically to finned heat exchange units. The invention also relates to heat exchangers including the finned heat exchange units, and to processing apparatus and methods for the finned heat exchange units. Background Technology

[0002] Finned heat exchangers are the most widely used heat exchange equipment in gas-liquid heat exchangers. They enhance heat transfer by adding fins to the base tube. During operation, the fluid flows through the inside of the base tube, and the heat is transferred to the air passing between the fins through the fins tightly wrapped around the base tube, thus achieving heat exchange and the function of heating or cooling the air.

[0003] According to the manufacturing process, finned heat exchangers can be divided into several types, including integral finned heat exchangers, welded finned heat exchangers, high-frequency welded finned heat exchangers, and mechanically connected finned heat exchangers. Integral finned heat exchangers are made by casting, machining, or rolling, with the fins and the base tube as a single unit. Welded finned heat exchangers connect the base tube and fins using a welding process. High-frequency welded finned heat exchangers utilize high-frequency induction generated by a high-frequency generator to produce high temperatures at the contact point between the base tube surface and the fins, melting both and then applying pressure to connect the fins and the base tube as a single unit. Mechanically connected finned heat exchangers typically include types such as wound fins, embedded fins, sleeved fins, or serial fins.

[0004] The above processing method is only applicable to finned heat exchangers with straight base tubes. If the base tube of the finned heat exchanger is curved, there is a technical problem that the fins are difficult to install. Summary of the Invention

[0005] This technical solution provides a finned heat exchange unit to solve the technical problem of difficult fin installation.

[0006] This technical solution also provides a heat exchanger including the finned heat exchange unit, as well as a processing device and processing method for the finned heat exchange unit.

[0007] The finned heat exchange unit provided by this technical solution includes a base tube and fins installed on the base tube. Let the number of base tubes be N, then N≥2. Each fin includes a mounting hole corresponding to the number of base tubes, and the centers of the mounting holes are distributed along the same circumference on the fin. The base tube is in a spiral shape, and a number of fins are fitted onto the base tube through the mounting holes to form a stacked fin group on the base tube.

[0008] In the aforementioned finned heat exchange unit, the centers of the mounting holes for each fin are distributed along the same circumference on the fin. The base tube is spiral-shaped, and several fins are fitted onto the base tube through the mounting holes to form a stacked fin group on the base tube. This facilitates fin installation and reduces the difficulty of fin installation.

[0009] The finned heat exchanger provided by this technical solution is equipped with the aforementioned finned heat exchange unit. Since the finned heat exchange unit has the above-mentioned technical effects, the finned heat exchanger equipped with the aforementioned finned heat exchange unit should also have the corresponding technical effects.

[0010] The finned heat exchanger unit processing device provided in this technical solution includes:

[0011] A torsion sleeve is used to accommodate a base tube in a straight shape with fins mounted on it.

[0012] A first torsion shaft is located at one end of the sleeve; the first torsion shaft is rotatably engaged with the sleeve, and is provided with a first torsion through hole corresponding to the number of base tubes, and the first end of the base tube can extend outward through the first torsion through hole.

[0013] The second torsion shaft is located at the other end of the sleeve; the second torsion shaft is rotatably engaged with the sleeve, and has a second torsion through hole corresponding to the number of base tubes, and the second end of the base tube can extend outward through the second torsion through hole.

[0014] The aforementioned finned heat exchanger processing device can twist the finned base tube into a spiral shape, thereby reducing the difficulty of fin installation. Its structure is simple, easy to operate, and facilitates mass production.

[0015] The finned heat exchanger unit processing method provided in this technical solution includes:

[0016] Prepare a number of base tubes N≥2;

[0017] Prepare fins and machine mounting holes on each fin corresponding to the number of base tubes, so that the centers of the mounting holes are located on the same circumference and are symmetrically or evenly distributed.

[0018] Several fins are fitted onto a straight-shaped base tube through mounting holes;

[0019] A straight-shaped base tube is twisted into a spiral shape.

[0020] The base tube is welded to the fins.

[0021] The above-mentioned finned heat exchanger unit processing method can install fins on the base tube and then twist it into a spiral shape, thereby reducing the difficulty of fin installation. The procedure is simple, easy to implement, and convenient for mass production of finned heat exchanger units. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a finned heat exchange unit provided in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 AA view of the finned heat exchange unit shown;

[0024] Figure 3 for Figure 1 The BB view of the finned heat exchange unit shown;

[0025] Figure 4 for Figure 1 CC view of the finned heat exchanger unit shown;

[0026] Figure 5 for Figure 1 DD view of the finned heat exchanger unit shown;

[0027] Figure 6 for Figure 1 A partial cross-sectional view of the finned heat exchanger unit shown.

[0028] Figure 7 for Figure 1 A cross-sectional view of a single fin;

[0029] Figure 8 for Figure 1 Front view of a single fin;

[0030] Figure 9 A schematic diagram showing a single fin with a corrugated shape in the circumferential direction;

[0031] Figure 10 This is a schematic diagram of the arrangement of finned heat exchange units in a finned heat exchanger according to an embodiment of the present invention.

[0032] Figure 11 for Figure 10 EE view;

[0033] Figure 12 This is a schematic diagram of the structure of a finned heat exchanger unit processing device provided in an embodiment of the present invention;

[0034] Figure 13 This is a flowchart of a finned heat exchanger unit processing method provided in an embodiment of the present invention.

[0035] In the picture:

[0036] 10. Base tube 20. Fin 21. Mounting hole 22. Flanged 30. Torsion sleeve 31. First torsion shaft 311. First torsion through hole 32. Second torsion shaft 321. Second torsion through hole 33. Torsion wrench. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In this document, terms such as "upper," "lower," "inner," and "outer" are established based on the positional relationships shown in the accompanying drawings. Depending on the drawings, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0039] In this article, "several" refers to three or more quantities.

[0040] Please refer to Figures 1 to 5 , Figure 1 This is a schematic diagram of the structure of a finned heat exchange unit provided in an embodiment of the present invention; Figure 2 for Figure 1 AA view of the finned heat exchange unit shown; Figure 3 for Figure 1 The BB view of the finned heat exchange unit shown; Figure 4 for Figure 1 CC view of the finned heat exchanger unit shown; Figure 5 for Figure 1 The DD view of the finned heat exchanger unit shown.

[0041] As shown in the figure, in one specific embodiment, the finned heat exchange unit provided by the present invention mainly consists of two base tubes 10 and multiple fins 20. The base tubes 10 are spiral in shape, and several fins 20 are evenly fixed on the spiral-shaped base tubes 10 at a set interval. In related technologies, there are many methods to process the base tubes 10 into a spiral shape. However, if the base tubes 10 are first processed into a spiral shape and then the fins 20 are installed, it will be difficult to install the fins 20 into the base tubes 10.

[0042] To address this, the present invention processes two mounting holes 21 on each fin 20, corresponding to the base tube 10. The centers of the mounting holes 21 are located on the same circumference of the fin 20 (see...). Figure 2 , Figure 3 , Figure 4 , Figure 5 The distribution of the dots and dashes in the diagram means that the circumference diameter of the two mounting holes 21 is equal to the distance between the two base tubes 10; several fins 20 are fitted onto the base tubes 10 in a straight shape through the mounting holes 21, and are welded to the base tubes 10 after the base tubes 10 are twisted into a spiral shape, thereby forming a stacked fin group on the base tubes 10.

[0043] Since each fin 20 is circular, the resulting fin group is cylindrical along the base tube direction. The fins 20 of the fin group are parallel to each other, and the adjacent fins 20 have basically the same spacing.

[0044] As can be seen from the cross-sectional views of AA, BB, CC, and DD, after the base tube 10 is twisted into a spiral shape, the centers of the two base tubes 10 are located on the same circumference (as shown by the dotted line) and are symmetrically distributed. The base tubes 10 are spirally wrapped around the central axis of the fin group. Within the same spiral stroke, the centers of the two base tubes 10 are at different phase angles and cycle repeatedly.

[0045] To facilitate welding after twisting, a brazing film can be coated on the mating surfaces of the base tube 10 and the circular fins 20. In this way, after the base tube 10 is twisted into a spiral shape, it can be brazed and shaped in a furnace to fix the base tube 10 and the fins 20 together.

[0046] The base tube 10 can be an aluminum pipe fitting. Using an aluminum pipe fitting as the base tube 10 can make full use of the high ductility of aluminum, making it easy to twist. This allows the base tube 10 to easily deform from a straight shape to a spiral shape. During the deformation process, the shape of the cross-section of the base tube 10 can remain basically unchanged, and it can maintain a stable shape after deformation, avoiding problems such as springback.

[0047] The finned heat exchange unit of this embodiment consists of a straight base tube 10 fitted with fins 20 and then twisted into a spiral shape, or commonly known as a "twisted rope". This not only allows the curvature of the "arc tube" to change the direction of the medium flow and achieve the purpose of turbulent flow of the working fluid, but also makes it easier to fit and weld the fins 20 for heat transfer, which is convenient for mass production.

[0048] Please refer to this as well. Figures 6 to 9 , Figure 6 for Figure 1 A partial cross-sectional view of the finned heat exchanger unit shown. Figure 7 for Figure 1 A cross-sectional view of a single fin; Figure 8 for Figure 1 Front view of a single fin; Figure 9 This is a schematic diagram showing a single fin with a corrugated shape in the circumferential direction.

[0049] As shown in the figure, the heat transfer fins 20 are made of circular thin sheets. Two mounting holes 21 with flanges 22 are punched out on the concentric circumference inside the circular fins 20. The mounting holes 21 are circular holes with a diameter slightly larger than the outer diameter of the base tube 10 so that they can be easily fitted onto the base tube 10. The flanges 22 of the mounting holes 21 extend to one side and the length is approximately equal to the placement spacing of the fins 20.

[0050] By designing the flange 22, on the one hand, the spacing between the fins 20 can be precisely controlled. After the fins 20 are fitted onto the base tube 10, the flange 22 of the previous fin 20 will automatically abut against the next fin 20, thus eliminating the need for manual intervention and adjustment. On the other hand, the flange 22 can increase the contact area between the fins 20 and the base tube 10, thereby enabling them to be welded together more reliably, making the fins 20 less prone to loosening or falling off, and helping to extend the service life of the finned heat exchange unit.

[0051] In this embodiment, the fins 20 are extruded into a corrugated shape along the outer circumference. This further increases the heat exchange area of ​​the fins 20 and has a certain turbulence effect on the airflow passing through the fins 20, enabling the fins 20 to exchange heat more fully with the airflow and improving the heat exchange efficiency.

[0052] Please continue to refer to this. Figure 10 , Figure 11 , Figure 10 This is a schematic diagram of the arrangement of finned heat exchange units in a finned heat exchanger according to an embodiment of the present invention. Figure 11 for Figure 10 EE view.

[0053] As shown in the figure, the finned heat exchanger provided in this embodiment consists of multiple finned heat exchange units and manifolds (not shown in the figure) located at both ends of the finned heat exchange units. The finned heat exchange units are the finned heat exchange units described above. The two ends of the base tube 10 of each finned heat exchange unit are welded to the corresponding manifold.

[0054] Multiple finned heat exchange units are arranged in multiple layers, with at least two finned heat exchange units arranged in the same layer. The finned heat exchange units in adjacent layers are staggered along the arrangement direction, and the fins 20 of the finned heat exchange units in adjacent layers are arranged crosswise along the axial direction. Through the staggered arrangement of the finned heat exchange units and the crosswise arrangement of the fins 20, a better airflow disturbance effect can be obtained.

[0055] When in use, the same type and state of refrigerant can be introduced into the base tube 10 of the finned heat exchange unit, or other fluids can be introduced, and parallel or series flow paths can be formed through the manifold.

[0056] Of course, the above-mentioned finned heat exchanger is only an illustrative example. In practical applications, finned heat exchange units can be reasonably combined in other ways according to the size requirements of the heat exchanger.

[0057] Please refer to Figure 12 , Figure 12 This is a schematic diagram of a finned heat exchanger unit processing device provided in an embodiment of the present invention.

[0058] As shown in the figure, the present invention also provides a finned heat exchanger unit processing device. For ease of description, this embodiment is described according to the structure in which only two mounting holes are provided on the fins.

[0059] The finned heat exchanger processing device is equipped with a torsion sleeve 30, a first torsion shaft 31 and a second torsion shaft 32. The torsion sleeve 30 can be used to accommodate a base tube 10 in a straight shape with fins 20 mounted on it.

[0060] The first torsion shaft 31 is located at one end of the torsion sleeve 30, i.e. the left end shown in the figure. The first torsion shaft 31 is generally in the shape of a disc. The circular boss in the middle extends into the torsion sleeve 30 and rotates with the torsion sleeve 30. It is provided with two first torsion through holes 311 corresponding to the base tube 10. The left end of the base tube 10 can extend outward a certain distance through the first torsion through holes 311.

[0061] Similarly, the second torsion shaft 32 is located at the other end of the torsion sleeve 30, i.e. the right end shown in the figure. The second torsion shaft 32 is generally in the shape of a disc, with a circular boss in the middle extending into the torsion sleeve 30 and rotating with the torsion sleeve 30. It is provided with two second torsion through holes 321 corresponding to the base tube 10. The right end of the base tube 10 can extend outward a certain distance through the second torsion through holes 321.

[0062] The torsion sleeve 30 is divided into a first semicircular sleeve and a second semicircular sleeve, which can be opened and closed. That is, the torsion sleeve 30 is cut into two halves along the central axis of the sleeve. One half is the first semicircular sleeve and the other half is the second semicircular sleeve. The edges of the two halves can be connected by a flange, or one side of the edge can be connected by a rotating shaft, and the other side of the edge can be connected by a flange or a locking device, etc. The inner hole of the first semicircular sleeve and the second semicircular sleeve after being closed is slightly larger than the outer diameter of the circular fin 20.

[0063] The ends of the first torsion shaft 31 and the second torsion shaft 32 are respectively provided with torsion wrenches 33, so as to manually drive the first torsion shaft 31 and the second torsion shaft 32 to twist in opposite directions, thereby twisting the straight base tube 10 into a spiral base tube 10.

[0064] In use, first, the fins 20 are fitted onto the two base tubes 10; then, the entire string of fins 20 and base tubes 10 are placed into the open torsion sleeve 30. After the torsion sleeve 30 is closed, its cylindrical inner circle just restricts the circular fins 20, but with a slight gap, allowing the entire string of circular fins 20 to rotate or slide freely within the torsion sleeve 30; then, the first torsion shaft 31 and the second torsion shaft 32 are inserted into the holes at both ends of the torsion sleeve 30, so that the base tubes extend outward from the torsion through holes of the first torsion shaft 31 and the second torsion shaft 32; next, the first torsion shaft 31 and the second torsion shaft 32 are twisted in opposite directions, causing the two base tubes 10 to twist against each other, gradually forming a spiral shape, i.e., a twisted shape. In this way, the original straight base tube 10 can be processed into... Figure 1 The spiral shape shown.

[0065] It is understandable that the device is also suitable for simultaneously twisting three or four base tubes 10. The centers of all base tubes 10 are evenly distributed on a circumference concentric with the outer diameter of the fins 20. During the twisting process of the straight base tube 10, the sides of the base tube 10 are dispersed and evenly supported and restricted within the twisting sleeve 30 by numerous circular fins 20, and can only rotate along the inner wall of the twisting sleeve 30. As a result, it is twisted into a spiral shape, thus completing the formation of the curved tube.

[0066] Considering that the axial length of the base tube 10 will shorten during the torsion process, the torsion through holes of the first torsion shaft 31 and the second torsion shaft 32 are in a sliding fit relationship with the base tube 10. Before torsion, the base tube 10 has sufficient length outside the torsion through hole to compensate for the shrinkage of the base tube 10 during the torsion process.

[0067] The manual twisting method is suitable for small-batch production. For mass production, the twisting can be performed by a motor or an electric motor. For example, a first twisting drive device and a second twisting drive device (not shown in the figure) can be added. The first twisting drive device is connected to the first twisting shaft 31, and the second twisting drive device is connected to the second twisting shaft 32. The first twisting drive device and the second twisting drive device can use a motor, electric cylinder, pneumatic cylinder, etc. as power sources to drive the first twisting shaft 31 and the second twisting shaft 32 to twist in opposite directions. The twisting angle can be set to automatically twist the straight base tube 10 into a spiral base tube 10.

[0068] The above embodiments are merely preferred embodiments of the present invention and are not limited thereto. Based on these, targeted adjustments can be made according to actual needs to obtain different implementation methods. For example, the number of base tubes 10 can be three, four, etc., and they can be evenly distributed on the same circumference, or the fins can be polygonal, etc. Since there are many possible implementation methods, they will not be listed here.

[0069] Please refer to Figure 13 , Figure 13 This is a flowchart of a finned heat exchanger unit processing method provided in an embodiment of the present invention.

[0070] As shown in the figure, the finned heat exchanger unit processing method provided in this embodiment includes:

[0071] S101: Provide a quantity of N≥2 base tubes 10;

[0072] S102: Provide fins 20, and machine mounting holes 21 on each fin 20 corresponding to the number of base tubes 10, so that the centers of the mounting holes 21 are located on the same circumference and are symmetrically or evenly distributed.

[0073] S103: Several fins 20 are fitted onto the straight-shaped base tube 10 through the mounting holes 21;

[0074] S104: Place the base tube 10 fitted with fins 20 into the torsion sleeve 30, so that the first end of the base tube 10 extends outward through the first torsion through hole 311 of the first torsion shaft 31, and the second end of the base tube extends outward through the second torsion through hole 321 of the second torsion shaft 32.

[0075] S105: Drive the first torsion shaft 31 and the second torsion shaft 32 to twist in opposite directions, twisting the straight base tube 10 into a spiral base tube 10.

[0076] S106: Weld the base tube 10 to the fin 20.

[0077] Furthermore, welding the base tube 10 to the fins 20 includes:

[0078] A brazing film is pre-plated on the surfaces where the base tube 10 and fins 20 come into contact, and the base tube 10 and fins 20 are then brazed and shaped in a furnace after the base tube 10 is twisted into a spiral shape.

[0079] This processing method is easy to implement in terms of technology and effectively solves the problem that it is difficult to install fins 20 on curved base tube 10, making it suitable for mass production.

[0080] The finned heat exchange unit, heat exchanger, and their processing apparatus and method provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A finned heat exchange unit, comprising a base tube and fins mounted on the base tube, characterized in that, it is provided with The number of base tubes is N, then N≥2; each fin includes a mounting hole corresponding to the number of base tubes, and the centers of the mounting holes are distributed along the same circumference on the fin; the base tube is in a spiral shape, and a number of fins are fitted onto the base tube through the mounting holes to form a stacked fin group on the base tube.

2. The finned heat exchange unit according to claim 1, characterized in that, The mounting holes of the fins include flanges extending to one side, the length of which is approximately equal to the mounting spacing of the fins.

3. The finned heat exchange unit according to claim 1, characterized in that, Each of the fins is circular or polygonal, and the fin group is generally cylindrical along the direction of the base tube.

4. The finned heat exchange unit according to claim 1, characterized in that, Each of the fins has a corrugated shape at least at its outer edge in the circumferential direction.

5. The finned heat exchange unit according to claim 1, characterized in that, The mounting holes are evenly distributed along the same circumference, and each of the base tubes is spirally arranged around the central axis of the fin group.

6. A finned heat exchanger, characterized in that, The device includes a finned heat exchange unit as described in any one of claims 1 to 5. The finned heat exchanger includes a plurality of the finned heat exchange units, which are divided into multiple layers. At least two finned heat exchange units are arranged in the same layer. The finned heat exchange units in two adjacent layers are staggered along the arrangement direction, and the fins of the finned heat exchange units in two adjacent layers are arranged crosswise along the axial direction.

7. A processing device for finned heat exchange units, characterized in that, include: A torsion sleeve is used to accommodate a base tube in a straight shape with fins fitted on it. A first torsion shaft is located at one end of the sleeve; the first torsion shaft is rotatably engaged with the sleeve, and is provided with a first torsion through hole corresponding to the number of base tubes, and the first end of the base tube can extend outward through the first torsion through hole. The second torsion shaft is located at the other end of the sleeve; the second torsion shaft is rotatably engaged with the sleeve, and has a second torsion through hole corresponding to the number of base tubes, and the second end of the base tube can extend outward through the second torsion through hole.

8. The finned heat exchanger unit processing device according to claim 7, characterized in that, The sleeve includes a first semicircular sleeve and a second semicircular sleeve that can be opened and closed.

9. The finned heat exchanger unit processing device according to claim 7 or 8, characterized in that, The ends of the first torsion shaft and the second torsion shaft are respectively provided with torsion wrenches to manually drive the first torsion shaft and the second torsion shaft to twist in opposite directions, so as to twist the straight base tube into a spiral base tube. Alternatively, it may include a first torsion drive device and a second torsion drive device, wherein the first torsion drive device is drivenly connected to the first torsion shaft and the second torsion drive device is drivenly connected to the second torsion shaft; the first torsion drive device and the second torsion drive device are used to drive the first torsion shaft and the second torsion shaft to twist in opposite directions, so as to twist the straight base tube into a spiral base tube.

10. Processing methods for finned heat exchange units, including: Provide a quantity of N≥2 base tubes; Provide fins, and machine mounting holes on each fin corresponding to the number of base tubes, so that the centers of the mounting holes are located on the same circumference and are symmetrically or evenly distributed; Several fins are fitted onto a straight-shaped base tube through mounting holes; A straight-shaped base tube is twisted into a spiral shape. The base tube is welded to the fins.

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