Heat exchange plate, heat exchange unit and heat exchange core

Abstract

The invention provides a heat exchange plate, a heat exchange unit and a heat exchange core, and belongs to the technical field of heat transfer. The technical problems of low heat exchange efficiency, low welding spot density, low structural strength, stress concentration, gas-liquid separation, bypass, lateral flow and the like of an existing water heating connection structure are solved. The heat exchange plate comprises a plurality of wave crest units which are transversely distributed along a plate body, the horizontal sections of the wave crest units are discontinuous curves, a groove unit is formed between every two adjacent wave crest units, each wave crest unit comprises a plurality of wave crests which are vertically distributed along the plate body, and the horizontal sections of the wave crests are arc sections. Two adjacent wave crests are opposite to each other, a flow guide groove is arranged between the head and the tail of the two adjacent wave crests, a recess capable of being communicated with the two adjacent flow guide grooves is arranged between the two adjacent flow guide grooves, and the groove is communicated with the recess. The heat exchanger has the advantages that the heat exchange efficiency is high, and the welding spot density can be improved within the same range.

Description

Technical Field

[0001] The present invention belongs to the field of heat transfer technology, and in particular relates to a heat exchange plate, a heat exchange unit and a heat exchange core. Background Art

[0002] Heat exchange plate is a heat exchange element made of metal plate. It realizes efficient heat transfer through the flow of refrigerant between plates and is used for heat exchange between different media. In the prior art, most of them are herringbone plate laminations, which have low density of welding points, resulting in strength and stress concentration problems. In addition, there are common problems such as gas-liquid separation and bypass and lateral flow during use, resulting in unsatisfactory heat exchange efficiency. Summary of the invention

[0003] The object of the present invention is to provide a heat exchange plate which can improve the heat exchange efficiency and increase the density of welding points within the same range in order to solve the above problems.

[0004] Another object of the present invention is to provide a heat exchange unit.

[0005] Another object of the present invention is to provide a heat exchange core.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: the heat exchange plate comprises a plurality of wave crest units which are distributed laterally along the plate body and have a non-continuous curve in horizontal cross section, a groove unit is formed between two adjacent wave crest units, the wave crest unit comprises a plurality of wave crests which are distributed vertically along the plate body and have an arc segment in horizontal cross section, two adjacent wave crests are opposite to each other and a guide groove is provided between the head and tail of the two adjacent wave crests, a depression which can be connected with the guide groove is provided between the two adjacent guide grooves, the groove unit is connected with the depression to form a main channel, and two adjacent main channels are connected through the guide groove.

[0007] The non-continuous curve wave peak unit increases the surface area of ​​the heat exchange plate, provides more heat exchange interfaces, and helps to increase the contact area between the fluid and the heat exchange plate, thereby improving the heat exchange efficiency; due to the connection between the groove unit and the depression, the turbulence and mixing of the fluid are promoted, making the flow of the fluid on the surface of the heat exchange plate more complicated, enhancing the heat conduction and convection heat transfer inside the fluid, and improving the overall heat exchange performance; two adjacent wave peaks are opposite to each other and a guide groove is provided between the head and tail of the two adjacent wave peaks, which helps to guide the fluid to flow along a specific path, reduce the dead zone of the fluid flow, and improve the uniform distribution of the fluid on the surface of the heat exchange plate, thereby improving the uniformity of heat exchange; the wave peak with an arc segment in the horizontal cross section not only increases the heat exchange area, but also enables the heat exchange plate to better disperse stress when under pressure, improves the structural strength and durability of the heat exchange plate, and increases the density of welding points; the design of the grooves and depressions helps to prevent the deposition of impurities in the fluid and reduces the difficulty of cleaning and maintenance.

[0008] In the above-mentioned heat exchange plate, the central axis of the guide groove is parallel to or overlaps with the central axis of the crest unit; or, the central axis of the guide groove is transversely perpendicular to the central axis of the crest unit; or, the central axis of the guide groove is inclined to the central axis of the crest unit. That is, the guide groove is parallel, perpendicular or inclined to the flow direction of the main channel. When the central axis of the guide groove is parallel to or overlaps with the central axis of the crest unit, it helps to quickly pass through the crest unit and reduce flow resistance; when it is transversely perpendicular to the central axis of the crest unit, it can increase the contact area of ​​the fluid on the heat exchange plate and improve the heat exchange efficiency; when it is inclined to the central axis of the crest unit, it can optimize the fluid distribution and heat exchange effect.

[0009] In the above heat exchange plate, the horizontal cross section of the wave crest is any one of C-shaped, V-shaped or semi-elliptical. The C-shaped wave crest can enhance fluid disturbance and improve heat exchange efficiency due to its curved shape; the V-shaped wave crest has a certain supporting effect in the vertical direction, which helps to enhance the structural strength of the heat exchange plate; the semi-elliptical wave crest helps to evenly distribute the fluid on the heat exchange plate and reduce flow resistance.

[0010] In the above heat exchange plate, the groove unit includes a groove between the crest of one crest unit and the crest of another crest unit between two adjacent rows of crest units, and the groove is connected to the flow guide groove. The connection between the groove and the flow guide groove forms a complex fluid channel network, which helps to guide the fluid to flow and mix more fully inside the heat exchange plate, thereby improving the heat exchange efficiency and helping to achieve uniform distribution of the fluid on the heat exchange plate.

[0011] In the above heat exchange plate, the cross-sectional shape of the guide groove is any one of V-shaped, trapezoidal, semicircular or arc-shaped. The V-shaped groove can provide a deeper fluid channel, which helps to increase the heat exchange area. The cross-sectional shape of the trapezoidal guide groove gradually expands, which helps the fluid to gradually slow down and smoothly transition during the flow process, reducing fluid impact and noise. The cross-sectional shape of the semicircular or arc-shaped guide groove enables the fluid to maintain a relatively uniform flow rate and flow direction during the flow process, which helps to achieve uniform heat exchange on the heat exchange plate.

[0012] In the above heat exchange plate, the top surface of the wave crest is a plane, and the bottom of the depression is provided with a welding plane. The welding plane provides a stable contact surface for the welding process, can reduce defects such as deformation and cracks during the welding process, and helps to ensure the quality and strength of the welded joint, thereby improving the reliability of the overall structure.

[0013] The present invention discloses a heat exchange unit, comprising two heat exchange plates as described above, wherein the two heat exchange plates are connected and the guide grooves are arranged inwards.

[0014] The two heat exchange plates are connected and the flow guide grooves are set inwards, making the entire heat exchange unit more compact and stable in structure. This design helps to reduce the deformation and displacement of the heat exchange plate when subjected to fluid pressure and temperature changes; and because the flow guide grooves are set inwards, the connection between the two heat exchange plates can be more tightly sealed, reducing the risk of fluid leakage, which helps to improve the reliability and safety of the heat exchange unit.

[0015] In the above heat exchange unit, the two heat exchange plates are symmetrical in structure and connected by welding; or one heat exchange plate is welded to another heat exchange plate that is horizontally flipped. The two heat exchange plates are symmetrical or flipped to form different flow channels to meet different heat exchange requirements.

[0016] In the above heat exchange unit, the contact surface of the crest on one heat exchange plate and the crest on another heat exchange plate is partially welded or fully welded. The planes at the tops of the two crests are connected by welding, and the welding quality is ensured by a sufficient welding area, which improves the reliability of the overall structure. The optional partial welding or full welding can further reduce the production cost while ensuring the overall structural strength.

[0017] The heat exchange core comprises at least two heat exchange units as described above, and the end faces of two adjacent heat exchange units are connected; and / or, at least two heat exchange units are also arranged on the same plane, the two adjacent heat exchange units are symmetrically arranged and connected at the side edges, and the main channels of the two adjacent heat exchange units are interconnected and correspond one to one.

[0018] The combination of multiple heat exchange units significantly increases the heat exchange area, thereby improving the overall heat exchange capacity. The wave crest and guide groove design inside each heat exchange unit has optimized the fluid flow and heat exchange effect, and the combination of multiple units further amplifies this effect; and the heat exchange core is composed of multiple heat exchange units tightly connected, with a compact overall structure and a small footprint. This design enables the heat exchange core to achieve efficient heat exchange in a limited space, and is suitable for various space-constrained occasions.

[0019] In the above heat exchange core, the outer wall of the flow guide groove of a heat exchange plate of one heat exchange plate unit is welded to the outer wall of the flow guide groove of a heat exchange plate of another heat exchange plate unit. The welding connection can form a reliable sealing surface, which can ensure the tight connection between the heat exchange plate units, so that the heat exchange core has higher structural strength when subjected to fluid pressure and temperature changes, and reduces the risk of loosening or leakage caused by vibration or pressure changes.

[0020] In the above heat exchange core, in two adjacent heat exchange units on the same plane, the side edge of the heat exchange plate of one heat exchange unit is welded to the side edge of the heat exchange plate of the other heat exchange unit. The welded connection provides a stronger structural rigidity for the heat exchange core. Through the welding of the side edges, a stable connection is formed between adjacent heat exchange units, which effectively resists deformation or displacement caused by factors such as fluid pressure, temperature changes or external vibrations, thereby ensuring the overall stability of the heat exchange core and the reliability of long-term operation.

[0021] Compared with existing technologies, the design of the heat exchange plate significantly improves the heat exchange efficiency and service life by optimizing the fluid flow path, increasing the heat exchange area, and improving flow uniformity and structural strength, while maintaining low manufacturing and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the heat exchange plate of Example 1 provided by the present invention.

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of a heat exchange plate according to Example 1 provided by the present invention.

[0024] Figure 3 It is a schematic diagram of the structure of a heat exchange unit according to Example 1 provided by the present invention.

[0025] Figure 4 It is a schematic diagram of the cross-sectional structure of a heat exchange unit according to Example 1 provided by the present invention.

[0026] Figure 5 It is a schematic diagram of the refrigerant form inside the heat exchange unit of Example 1 provided by the present invention.

[0027] Figure 6 It is a schematic diagram of the structure of the heat exchange unit of Example 2 provided by the present invention.

[0028] Figure 7 It is a schematic diagram of the cross-sectional structure of the heat exchange unit of Example 2 provided by the present invention.

[0029] Figure 8 It is a schematic diagram of the refrigerant form inside the heat exchange unit of Example 2 provided by the present invention.

[0030] Fig. 9 It is a schematic diagram of the cross-sectional structure of the heat exchange unit of Example 3 provided by the present invention.

[0031] Fig.10 It is a schematic diagram of the refrigerant form inside the heat exchange unit of Example 3 provided by the present invention.

[0032] Fig.11 It is a schematic diagram of the cross-sectional structure of the heat exchange unit of Example 4 provided by the present invention.

[0033] Fig.12It is a schematic diagram of the refrigerant form inside the heat exchange unit of Example 4 provided by the present invention.

[0034] Fig.13 It is a schematic diagram of the heat exchange core structure of Example 1 provided by the present invention.

[0035] Fig.14 It is a schematic diagram of the heat exchange core structure of Example 5 provided by the present invention.

[0036] Fig.15 This is a CFD flow trajectory diagram of Example 1 provided by the present invention.

[0037] Fig.16 It is a schematic diagram of the heat exchange core structure of Example 6 provided by the present invention.

[0038] Fig.17 It is a schematic diagram of the heat exchange core structure of Example 7 provided by the present invention.

[0039] In the figure, the plate body 1, the main channel 11, the crest unit 2, the crest 21, the guide groove 22, the welding plane 221, the depression 23, the groove unit 3, the groove 31, the heat exchange plate 4, and the heat exchange unit 5. DETAILED DESCRIPTION

[0040] Embodiment 1

[0041] like Figures 1 to 5 As shown in 13 and 15, a heat exchange plate comprises a plurality of wave crest units 2 which are distributed laterally along the plate body 1 and have a non-continuous curve in horizontal cross section, a groove unit 3 is formed between two adjacent wave crest units 2, the wave crest unit 2 comprises a plurality of wave crests 21 which are distributed vertically along the plate body 1 and have an arc segment in horizontal cross section, two adjacent wave crests 21 are opposite to each other and a guide groove 22 is provided between the head and tail of the two adjacent wave crests 21, a depression 23 which can be connected with the guide grooves 22 is provided between the two adjacent guide grooves 22, the groove unit 3 is connected with the depression 23 to form a main channel 11, and two adjacent main channels 11 are connected through the guide groove 22.

[0042] In this embodiment, the refrigerant exchanges heat with the plate body 1 when flowing through the surface of the plate body 1. While the refrigerant flows along the main channel 11, it can also flow between the recesses 23 through the guide grooves 22, which can solve the problem of gas-liquid separation and bypass, and at the same time solve the lateral flow problem, thereby improving the heat exchange efficiency.

[0043] More specifically, the central axis of the guide groove 22 is parallel to or overlaps with the central axis of the crest unit 2; the horizontal cross section of the crest 21 is C-shaped; and the cross section of the guide groove 22 is trapezoidal.

[0044] More specifically, the groove unit 3 includes a groove 31 disposed between the crest 21 of one crest unit 2 and the crest 21 of another crest unit 2 between two adjacent rows of crest units 2 , and the groove 31 is communicated with the guide groove 22 .

[0045] More specifically, the top surface of the wave crest 21 is a plane, and the bottom of the depression 23 is provided with a welding plane 221 .

[0046] like Figures 3 to 5 As shown, the heat exchange unit 5 includes two heat exchange plates 4, the two heat exchange plates 4 are connected and the guide grooves 22 are arranged inwardly.

[0047] In this embodiment, two heat exchange plates 4 facing inward are connected by the guide grooves 22, and a flow channel is formed between the two heat exchange plates 4. The refrigerant flows through the flow channel while performing heat exchange. The two heat exchange plates 4 are symmetrical in structure and connected by welding.

[0048] More specifically, the contact surfaces of the wave crests 21 of one heat exchange plate and the wave crests 21 of another heat exchange plate are all welded.

[0049] like Fig.13 As shown, a heat exchange core includes at least two heat exchange units 5, the end faces of two adjacent heat exchange units 5 are connected, and the outer wall of the guide groove 22 of a heat exchange plate 4 of one heat exchange plate unit 5 is welded to the outer wall of the guide groove 22 of a heat exchange plate 4 of another heat exchange plate unit 5.

[0050] In this embodiment, two heat exchange units 5 form a heat exchange core, which can provide stronger thermal performance.

[0051] More specifically, the two heat exchange plates 4 of each heat exchange unit 5 are symmetrical in structure.

[0052] Embodiment 2

[0053] The content of this embodiment is basically the same as that of the first embodiment, except that: Figures 6 to 8 As shown, a heat exchange plate 4 is welded to another heat exchange plate 4 of symmetrical structure after being horizontally rotated 180 degrees.

[0054] In this embodiment, one heat exchange plate 4 is connected to another heat exchange plate 4 that is flipped 180 degrees by welding. Compared with the first embodiment, a flow channel with a different structure is formed between the two heat exchange plates 4.

[0055] Embodiment 3

[0056] The content of this embodiment is basically the same as that of the first embodiment, except that: Fig. 9 and 10 As shown, a heat exchange plate 4 is welded to another heat exchange plate 4 of symmetrical structure after being horizontally rotated 90 degrees.

[0057] More specifically, the contact surface between the wave crest 21 of one heat exchange plate and the wave crest 21 of another heat exchange plate is partially welded.

[0058] In this embodiment, a heat exchange plate 4 is horizontally rotated 90 degrees with another heat exchange plate 4 of a symmetrical structure and then welded to form flow channels with different structures. The welding area is small and the production cost is lower.

[0059] Embodiment 4

[0060] The content of this embodiment is basically the same as that of the first embodiment, except that: Fig.11 and 12 As shown, a heat exchange plate 4 is welded to another heat exchange plate 4 of symmetrical structure after being horizontally rotated 270 degrees.

[0061] More specifically, the contact surface between the wave crest 21 of one heat exchange plate and the wave crest 21 of another heat exchange plate is partially welded.

[0062] In this embodiment, a heat exchange plate 4 is horizontally rotated 270 degrees with another heat exchange plate 4 of a symmetrical structure and then welded to form flow channels with different structures. The welding area is small and the production cost is lower.

[0063] Embodiment 5

[0064] The content of this embodiment is basically the same as that of the first embodiment, except that: Fig.14 As shown, the two heat exchange plates 4 of the heat exchange unit 5 are one heat exchange plate 4 and the other heat exchange plate 4 that is horizontally flipped.

[0065] Embodiment 6

[0066] The content of this embodiment is basically the same as that of the first embodiment, except that: Fig.16 As shown, the heat exchange core has two adjacent heat exchange units 5 on the same plane, and the side edge of the heat exchange plate 4 of one heat exchange unit 5 is welded to the side edge of the heat exchange plate 4 of the other heat exchange unit 5 .

[0067] In this embodiment, two heat exchange units 5 on the same plane are horizontally welded and connected, so that the heat exchange core forms a more stable structure in the same plane, which can better ensure the overall stability of the heat exchange core when subjected to fluid pressure and temperature changes.

[0068] Embodiment 7

[0069] The content of this embodiment is basically the same as that of the first embodiment, except that: Fig.17 As shown, the heat exchange core has four adjacent heat exchange units 5 on the same plane, and the side edge of the heat exchange plate 4 of one heat exchange unit 5 is welded to the side edge of the heat exchange plate 4 of another heat exchange unit 5 .

[0070] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0071] Although the terms such as plate body, main channel, crest unit, crest, flow guide groove, welding plane, depression, groove unit, groove, heat exchange plate, heat exchange unit are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional limitation.

Claims

1. A heat exchange plate, characterized in that: The invention comprises a plurality of wave crest units (2) which are distributed transversely along a plate body (1) and whose horizontal cross-sections are in the form of discontinuous curves, a groove unit (3) is formed between two adjacent wave crest units (2), the wave crest unit (2) comprises a plurality of wave crests (21) which are distributed vertically along the plate body (1) and whose horizontal cross-sections are in the form of arc segments, two adjacent wave crests (21) are opposite to each other and a guide groove (22) is provided between the head and tail of the two adjacent wave crests (21), a depression (23) which can be connected with the guide grooves (22) is provided between the two adjacent guide grooves (22), the groove unit (3) is connected with the depression (23) to form a main flow channel (11), and two adjacent main flow channels (11) are connected via the guide groove (22).

2. The heat exchange plate according to claim 1, characterized in that: The central axis of the guide groove (22) is parallel to or overlaps with the central axis of the wave crest unit (2); Alternatively, the central axis of the guide groove (22) is transversely perpendicular to the central axis of the wave crest unit (2); Alternatively, the central axis of the flow guide groove (22) is inclined to the central axis of the wave peak unit (2).

3. The heat exchange plate according to claim 1, characterized in that: The horizontal cross section of the wave crest (21) is any one of a C-shape, a V-shape or a semi-ellipse.

4. The heat exchange plate according to claim 1, characterized in that: The groove unit (3) comprises a groove (31) arranged between a crest (21) of one crest unit (2) and a crest (21) of another crest unit (2) between two adjacent rows of crest units (2), and the groove (31) is connected to the guide groove (22).

5. The heat exchange plate according to claim 1, characterized in that: The cross-sectional shape of the guide groove (22) is any one of a V-shape, a trapezoidal shape, a semicircular shape or an arc shape.

6. The heat exchange plate according to claim 1, characterized in that: The top surface of the wave crest (21) is a plane.

7. The heat exchange plate according to any one of claims 1 to 6, characterized in that: A welding plane (221) is provided at the bottom of the depression (23).

8. A heat exchange unit, characterized in that: It comprises two heat exchange plates (4) as claimed in any one of claims 1 to 7, the two heat exchange plates (4) are connected and the guide grooves (22) are arranged inwardly.

9. The heat exchange unit according to claim 8, characterized in that: The two heat exchange plates (4) are symmetrical in structure and connected by welding.

10. The heat exchange unit according to claim 8, characterized in that: One heat exchange plate (4) is welded to another heat exchange plate (4) that has been flipped horizontally.

11. The heat exchange unit according to claim 9 or 10, characterized in that: The contact surface between the wave crest (21) on one heat exchange plate (4) and the wave crest (21) on another heat exchange plate is partially welded or completely welded.

12. A heat exchange core, characterized in that: comprising at least two heat exchange units (5) according to any one of claims 8 to 11, wherein the end faces of two adjacent heat exchange units (5) are connected; And / or, at least two heat exchange units (5) are also arranged on the same plane, two adjacent heat exchange units (5) are symmetrically arranged and connected at the side edges, and the main flow channels (11) of the two adjacent heat exchange units (5) are interconnected and correspond one to one.

13. The heat exchange core according to claim 12, characterized in that: In two heat exchange units (5) connected at their end faces, the outer wall of a flow guide groove (22) of a heat exchange plate (4) of one heat exchange unit (5) is welded to the outer wall of a flow guide groove (22) of a heat exchange plate (4) of another heat exchange unit (5).

14. The heat exchange core according to claim 12, characterized in that: In two adjacent heat exchange units (5) on the same plane, a side edge of a heat exchange plate (4) of one heat exchange unit (5) is welded to a side edge of a heat exchange plate (4) of another heat exchange unit (5).

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