A cross flow heat exchanger

Abstract

The application discloses a cross-flow heat exchanger, comprising a plurality of heat exchange units arranged in an array, wherein: along the inlet direction of the first fluid, the plurality of heat exchange units form a plurality of columns of first heat exchange unit groups, and the number of heat exchange units in each column of the first heat exchange unit groups decreases; along the inlet direction of the second fluid, the plurality of heat exchange units form a plurality of columns of second heat exchange unit groups, and the number of heat exchange units in each column of the second heat exchange unit groups decreases. Compared with the prior art, the application divides the plurality of heat exchange units into the plurality of columns of first heat exchange unit groups and the plurality of columns of second heat exchange unit groups, the number of heat exchange units in each column of the first heat exchange unit groups decreases along the inlet direction of the first fluid, and the number of heat exchange units in each column of the second heat exchange unit groups decreases along the inlet direction of the second fluid, so that the heat exchange capacity of the heat exchanger is increased, the heat exchange uniformity is greatly improved, and the outlet fluid temperature uniformity is also greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cross-flow heat exchangers, in particular to a cross-flow heat exchanger. Background Art

[0002] Reference Figure 1 As shown, for the cross-flow heat exchanger composed of uniform channels, the inventor divides the heat exchanger of the prior art into 4 units (unit A, unit B, unit C, and unit D). The heat exchange area and convection heat transfer coefficient of these four units are consistent, and the only difference is the heat exchange temperature difference. According to the Newton cooling formula - Q = h·A·ΔT, the unit where unit A is located has the largest heat exchange temperature difference, so the heat exchange effect is also the best. Similarly, unit B and unit C are second, and unit D has the smallest heat exchange temperature difference, making it the unit with the worst heat exchange effect. Therefore, the fluid 1 and fluid 2 at the outlet of the heat exchanger of the prior art will have uneven airflow. In severe cases, there is a temperature difference of 5°C or more on the left and right sides of the outlet fluid, which cannot meet the air supply uniformity requirements of many industries.

[0003] In the process of realizing the present application, the inventors discovered that the prior art has at least the following problems: How to improve the air supply uniformity at the heat exchanger outlet is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] The object of the present invention is to provide a cross-flow heat exchanger to improve the technical problem of uneven air supply at the heat exchanger outlet in the prior art.

[0005] The present invention provides a cross-flow heat exchanger comprising a plurality of heat exchange units distributed in an array, wherein:

[0006] Along the inlet direction of the first fluid, the plurality of heat exchange units form a plurality of rows of first heat exchange unit groups, and the number of heat exchange units in each row of the first heat exchange unit group decreases;

[0007] Along the inlet direction of the second fluid, the plurality of heat exchange units form a plurality of rows of second heat exchange unit groups, and the number of heat exchange units in each row of the second heat exchange unit group decreases.

[0008] A cross-flow heat exchanger as described above, wherein, preferably, along the inlet direction of the first fluid, the heat exchange units in each column of the first heat exchange unit group decreases column by column or sequentially; along the inlet direction of the second fluid, several of the heat exchange units form multiple columns of second heat exchange unit groups, and the heat exchange units in each column of the second heat exchange unit group decreases column by column or sequentially.

[0009] In the cross-flow heat exchanger as described above, preferably, the inlet direction of the first fluid is the transverse direction, the inlet direction of the second fluid is the longitudinal direction, and there is a temperature difference between the first fluid and the second fluid and indirect heat exchange is performed.

[0010] In the cross-flow heat exchanger as described above, preferably, each of the heat exchange units has a plurality of first heat exchange channel groups and a plurality of second heat exchange channel groups, and the plurality of first heat exchange channel groups and the plurality of second heat exchange channel groups are cross-stacked.

[0011] A cross-flow heat exchanger as described above, wherein preferably, the fluid in the first heat exchange channel group flows along the direction in which the heat exchange units in the inlet direction of the first fluid decrease in sequence; the fluid in the second heat exchange channel group flows along the direction in which the heat exchange units in the inlet direction of the second fluid decrease in sequence.

[0012] A cross-flow heat exchanger as described above, wherein preferably, the first heat exchange channel group has a plurality of first heat exchange channels, and the plurality of first heat exchange channels are arranged in sequence along the inlet direction of the second fluid, and along the inlet direction of the second fluid, the channel widths of the plurality of first heat exchange channels of each first heat exchange channel group increase successively; the second heat exchange channel group has a plurality of second heat exchange channels, and the plurality of second heat exchange channels are arranged in sequence along the inlet direction of the first fluid, and along the inlet direction of the first fluid, the channel widths of the plurality of second heat exchange channels of each second heat exchange channel group increase successively.

[0013] A cross-flow heat exchanger as described above, wherein, preferably, along the inlet direction of the second fluid, the channel widths of the several first heat exchange channels of each first heat exchange channel group are arranged in a geometric series; and along the inlet direction of the first fluid, the channel widths of the several second heat exchange channels of each second heat exchange channel group are arranged in a geometric series.

[0014] A cross-flow heat exchanger as described above, wherein preferably, along the inlet direction of the first fluid, a first mixing channel is provided between two adjacent rows of the first heat exchange unit groups, and the first mixing channel is used to connect the first heat exchange channel groups of the heat exchange units of the two adjacent rows of the first heat exchange unit groups; along the inlet direction of the second fluid, a second mixing channel is provided between two adjacent rows of the second heat exchange unit groups, and the second mixing channel is used to connect the second heat exchange channel groups of the heat exchange units of the two adjacent rows of the second heat exchange unit groups.

[0015] A cross-flow heat exchanger as described above, wherein preferably, the first heat exchange unit group located in the rear row of the first mixing channel has a first arc-shaped guide surface at the end portion where the heat exchange unit is reduced relative to the first heat exchange unit group located in the front row of the first mixing channel, and the first arc-shaped guide surface is concave toward the first mixing channel; the second heat exchange unit group located in the rear row of the second mixing channel has a second arc-shaped guide surface at the end portion where the heat exchange unit is reduced relative to the second heat exchange unit group located in the front row of the second mixing channel, and the second arc-shaped guide surface is concave toward the second mixing channel.

[0016] In the cross-flow heat exchanger as described above, preferably, the projections of the first arc-shaped guide surface and the second arc-shaped guide surface in a third direction overlap, wherein the third direction is a vertical direction.

[0017] Compared with the prior art, the present invention reduces the number of heat exchange units in each column of the first heat exchange unit group along the inlet direction of the first fluid, and reduces the number of heat exchange units in each column of the second heat exchange unit group along the inlet direction of the second fluid, thereby eliminating the units with the worst heat exchange efficiency in both the first fluid inlet direction and the second fluid inlet direction, so that the first heat exchange unit group and the second heat exchange unit group in each column have good heat exchange efficiency, thereby greatly improving the heat exchange uniformity of the final outlet and the temperature uniformity of the outlet fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the inventor dividing the cross-flow heat exchanger in the prior art into four units;

[0019] Figure 2 1 is a schematic structural diagram of a cross-flow heat exchanger provided in Example 1 of the present invention;

[0020] Figure 3 yes Figure 2 AA section view;

[0021] Figure 4 yes Figure 2 BB cross-sectional view;

[0022] Figure 5 Schematic diagram of the structure of the cross-flow heat exchanger provided in the second embodiment of the present invention;

[0023] Figure 6 yes Figure 5 CC sectional view;

[0024] Figure 7 yes Figure 5 DD sectional view;

[0025] Figure 8 1 is a schematic structural diagram of a cross-flow heat exchanger provided in Example 3 of the present invention;

[0026] Figure 9 yes Figure 8 EE cross-sectional view;

[0027] Figure 10 yes Figure 8 FF cross-sectional view.

[0028] Description of reference numerals:

[0029] 1-first heat exchange unit, 2-second heat exchange unit, 3-third heat exchange unit, 4-first heat exchange channel, 5-second heat exchange channel, 6-first mixing channel, 7-second mixing channel, 8-first curved guide surface, 9-second curved guide surface;

[0030] LT1-first fluid, LT2-second fluid;

[0031] D1-first direction, D2-second direction, D3-third direction. DETAILED DESCRIPTION

[0032] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0033] like Figure 1 As shown, in the prior art, for a 0.6m*0.6m*6.15m corrugated plate heat exchanger, the inventors divided the corrugated plate heat exchanger into four units (unit A, unit B, unit C, and unit D). When the operating conditions are that the high and low temperature fluid air volumes are both 8000 and the temperatures are 35°C and 25°C respectively, the heat exchange capacity of unit A is 1.5 times that of units B and C, and 1.8 times that of unit D, and there is a temperature difference of 3°C in the outlet air.

[0034] For the heat exchangers in the prior art, in order to improve the heat exchange effect of units B, C, and D, two main methods are adopted: (1) setting a uniform enhanced heat exchange structure in the heat exchanger to improve the heat exchange effect of the heat exchanger as a whole; (2) setting a non-uniform enhanced heat exchange structure along the flow direction in the heat exchanger to make the heat exchange effect more uniform.

[0035] Although heat transfer enhancement is the mainstream method for improving the heat transfer performance of cross-flow heat exchangers, it still has certain drawbacks. For the first method mentioned above, essentially, it improves the heat transfer area and convective heat transfer coefficient of units A, B, C, and D, without changing the differences in heat transfer strength among the four units A, B, C, and D. At the same time, there is also a significant increase in flow resistance. As for the second method, there are two situations. The first is that only the density of the reinforcing structure in the direction of channel flow is adjusted, which improves the heat transfer performance at the end of the channel to a certain extent. However, since the structural differences of units B (or C) are very small, the heat transfer temperature difference of unit D is significantly smaller than that of unit B (or C), and unit D is still the worst heat transfer area. The second situation is that when the heat transfer enhancement structure of unit D is arranged most densely, the flow resistance of unit D far exceeds that of unit B (or C). At this time, the uniformity of the flow field of the entire heat exchanger is destroyed, making fluid 1 more inclined to flow out of unit C and fluid 2 more inclined to flow out of unit B. Due to the reduction in air volume, the heat transfer of unit D does not reflect the true enhancement effect.

[0036] Therefore, the inventors proposed a new heat exchanger, specifically Figures 2 to 10 As shown, an embodiment of the present invention provides a cross-flow heat exchanger, which includes but is not limited to plate heat exchangers, plate-fin heat exchangers, or tube-sheet heat exchangers. The cross-flow heat exchanger includes a plurality of heat exchange units distributed in an array, wherein:

[0037] Along the inlet direction of the first fluid LT1, that is, the first direction D1, several heat exchange units form multiple columns of first heat exchange unit groups, and the number of heat exchange units in each column of the first heat exchange unit group is reduced. Preferably, the heat exchange units in each column of the first heat exchange unit group are reduced column by column or sequentially. In a feasible embodiment, the first direction D1 extends along the horizontal direction. Along the first direction D1, several heat exchange units are distributed in a stepped array, and the heat exchange units in the latter column of the heat exchange unit group are one or more less than the heat exchange units in the former column of the heat exchange unit group. In this embodiment, the heat exchange unit in the latter column of the first heat exchange unit group is one less than the heat exchange unit in the former column of the first heat exchange unit group. In the first direction D1, there are two columns of first heat exchange unit groups, the first column of the first heat exchange unit group is provided with two heat exchange units, and the second column of the first heat exchange unit group is provided with one heat exchange unit. Those skilled in the art can know that more columns of first heat exchange unit groups can also be provided, and this is not limited here.

[0038] Along the inlet direction of the second fluid LT2, that is, the second direction D2, a plurality of heat exchange units form multiple columns of second heat exchange unit groups, and the number of heat exchange units in each column of the second heat exchange unit group is reduced. Preferably, the heat exchange units in each column of the first heat exchange unit group are reduced column by column or sequentially. In a feasible embodiment, the second direction D2 extends in the horizontal direction, and the second direction D2 is perpendicular to the extension direction of the first direction D1. Along the second direction D2, a plurality of heat exchange units form a stepped array distribution, and the heat exchange unit in the latter column of the second heat exchange unit group is one or less than the heat exchange unit in the former column of the second heat exchange unit group. In this embodiment, the heat exchange unit in the latter column of the second heat exchange unit group is one less than the heat exchange unit in the former column of the second heat exchange unit group. In the second direction D2, there are two columns of second heat exchange unit groups, the first column of the second heat exchange unit group is provided with two heat exchange units, and the second column of the second heat exchange unit group is provided with one heat exchange unit. Those skilled in the art can know that more columns of second heat exchange unit groups can also be provided, and this is not limited here.

[0039] The following describes the structure of the present application using three heat exchange units as an example. Those skilled in the art will appreciate that more variations can be designed based on this, all of which fall within the scope of protection of the present invention.

[0040] Example 1

[0041] Reference Figures 2 to 4 As shown, the three heat exchange units are the first heat exchange unit 1, the second heat exchange unit 2 and the third heat exchange unit 3. In the first direction D1, the second heat exchange unit 2 and the first heat exchange unit 1 are located in the first row, and the third heat exchange unit 3 is located in the second row. The inlet of the first fluid LT1 is set in the second heat exchange unit 2 and the first heat exchange unit 1. After the first fluid LT1 exchanges heat with the second fluid LT2 in the first heat exchange unit 1 and the second heat exchange unit 2, it flows to the third heat exchange unit 3 to exchange heat with the second fluid LT2. After the heat exchange, the first fluid LT1 is discharged from the third heat exchange unit 3 In the second direction D2, the third heat exchange unit 3 and the first heat exchange unit 1 are located in the first row, and the second heat exchange unit 2 is located in the second row. The inlet of the second fluid LT2 is set in the third heat exchange unit 3 and the first heat exchange unit 1. After the second fluid LT2 exchanges heat with the first fluid LT1 in the third heat exchange unit 3 and the first heat exchange unit 1, it flows to the second heat exchange unit 2 to exchange heat with the first fluid LT1. After the heat exchange, the second fluid LT2 is discharged from the second heat exchange unit 2. In this way, the first heat exchange unit 1, the second heat exchange unit 2 and the third heat exchange unit 3 form an "L"-shaped structure.

[0042] In comparison with the prior art, the position of the first heat exchange unit 1 is equivalent to unit A, the position of the second heat exchange unit 2 is equivalent to unit B, and the position of the third heat exchange unit 3 is equivalent to unit C. In the embodiment of the present application, under certain heat exchange area conditions, the unit D with the worst heat exchange is eliminated, and the area of ​​the unit D is expanded to the first heat exchange unit 1, the second heat exchange unit 2, and the third heat exchange unit 3, thereby increasing the heat exchange capacity of the heat exchanger, greatly improving the heat exchange uniformity, and greatly improving the uniformity of the outlet fluid temperature. According to the two-dimensional steady-state calculation of the cross-flow heat exchanger, under the same heat exchange area, the heat exchange capacity of the "L"-shaped cross-flow heat exchanger can be increased by more than 20%.

[0043] In this embodiment, the heat exchange unit has a plurality of first heat exchange channel groups and a plurality of second heat exchange channel groups. The plurality of first heat exchange channel groups and the plurality of second heat exchange channel groups are cross-stacked along a third direction D3. The third direction D3 is the direction of gravity. The third direction D3 is perpendicular to the plane where the first direction D1 and the second direction D2 are located. The first direction D1, the second direction D2 and the third direction D3 form a three-dimensional rectangular coordinate system.

[0044] The first heat exchange channel group is used for allowing the first fluid LT1 to flow through, and the fluid in the first heat exchange channel group flows along the direction of decreasing heat exchange units in the inlet direction of the first fluid LT1, that is, it flows from the second heat exchange unit 2 and the first heat exchange unit 1 to the third heat exchange unit 3. The second heat exchange channel group is used for allowing the second fluid LT2 to flow through, and the fluid in the second heat exchange channel group flows along the direction of decreasing heat exchange units in the inlet direction of the second fluid LT2, that is, it flows from the third heat exchange unit 3 and the first heat exchange unit 1 to the second heat exchange unit 2. There is a temperature difference between the first fluid LT1 and the second fluid LT2 and indirect heat exchange is performed. The embodiment provided in the present application increases the flow area of ​​the heat exchange channel by alternately stacking the first heat exchange channel group and the second heat exchange channel group, so that heat is fully transferred and the heat exchange efficiency is improved.

[0045] In a feasible embodiment, the first heat exchange channel group has a plurality of first heat exchange channels 4, and the first heat exchange channels 4 extend along the first direction D1. The first heat exchange channels 4 can be straight channels or wavy channels, etc., which are not limited here.

[0046] Reference Figure 3As shown, a number of first heat exchange channels 4 are arranged in sequence along the second direction D2, and the extension directions of the first heat exchange channels 4 are parallel. Along the second direction D2, the widths of the first heat exchange channels 4 in the heat exchange unit increase successively, thereby forming a non-uniform distribution. The first heat exchange unit 1 has the largest heat exchange temperature difference, so the heat exchange effect is the best. By designing the non-uniform width of the first heat exchange channel 4, the convective heat transfer coefficient of the second heat exchange unit 2 in the flow direction of the first fluid LT1 is enhanced, thereby increasing the heat exchange amount of the heat exchanger, greatly improving the heat exchange uniformity, and greatly improving the overall heat exchange effect. The outlet temperature uniformity of the first fluid LT1 is also greatly improved.

[0047] Furthermore, along the second direction D2, the widths of the first heat exchange channels 4 are arranged in geometric progression. Figure 3 As shown, the widths A0, A1, A2, ... of the first heat exchange channels 4 in the first heat exchange unit 1 satisfy the formula: The widths B0, B1, B2, etc. of the first heat exchange channel 4 in the second heat exchange unit 2 satisfy the formula The widths C0, C1, C2, etc. of the first heat exchange channel 4 in the third heat exchange unit 3 satisfy the formula In fact, the values ​​of k1, k2, and k3 can be calculated using a two-dimensional steady-state design method based on the heat exchanger thermal design method to achieve the required heat transfer capacity. The values ​​of A0, B0, and C0 can be designed based on the pressure drop requirements.

[0048] Reference Figure 3 As shown, along the first direction D1, a first mixing channel 6 is provided between two adjacent rows of heat exchange unit groups, and the first mixing channel 6 extends along the second direction D2. In the first direction D1, the first end and the second end of the first mixing channel 6 are arranged opposite to each other, and the first end of the first mixing channel 6 is connected to the first heat exchange channel 4 in the previous heat exchange unit, and the outlets of all the first heat exchange channels 4 in the previous heat exchange unit are connected to the first mixing channel 6. The second end of the first mixing channel 6 is connected to the first heat exchange channel 4 in the next heat exchange unit, and the inlet of all the first heat exchange channels 4 in the next heat exchange unit are connected to the first mixing channel 6. The first mixing channel 6 plays a role in evenly mixing the first fluid LT1.

[0049] In the embodiment provided in the present application, the first mixing channel 6 is used to mix the first fluid LT1 of the first heat exchange channel in the first heat exchange unit 1 and the second heat exchange unit 2 and then transport it to the first heat exchange channel of the third heat exchange unit 3. The amount of the first fluid LT1 in the first heat exchange channel of the third heat exchange unit 3 is the sum of the first heat exchange unit 1 and the second heat exchange unit 2, thereby improving the heat exchange effect. The setting of the first mixing channel 6 can, to a certain extent, play the role of mixing the first fluid LT1, so that the inlet temperature of the first fluid LT1 is more uniform, thereby making the outlet temperature more uniform.

[0050] In a feasible embodiment, the second heat exchange channel group has a plurality of second heat exchange channels 5, and the second heat exchange channels 5 extend along the second direction D2. The second heat exchange channels 5 can be straight channels or wavy channels, etc., which are not limited here.

[0051] Reference Figure 4 As shown, several second heat exchange channels 5 are sequentially spaced along the first direction D1. Along the first direction D1, the widths of the several second heat exchange channels 5 within the heat exchange unit increase. Along the first direction D1, the widths of the several first heat exchange channels 4 within the heat exchange unit increase, resulting in a non-uniform distribution. The first heat exchange unit 1 has the greatest heat exchange temperature difference and thus the best heat exchange effect. By designing the non-uniform width of the first heat exchange channels 4, the convective heat transfer coefficient of the third heat exchange unit 3 in the flow direction of the second fluid LT2 is enhanced, thereby increasing the heat exchange capacity of the heat exchanger and significantly improving heat exchange uniformity. This significantly enhances the overall heat exchange effect and the outlet temperature uniformity of the second fluid LT2.

[0052] Furthermore, along the first direction D1, the widths of the plurality of second heat exchange channels 5 are arranged in a geometric progression, referring to Figure 4 As shown, the widths A0, A1, A2, ... of the second heat exchange channels 5 in the first heat exchange unit 1 satisfy the formula: The widths B0, B1, B2, etc. of the second heat exchange channel 5 in the second heat exchange unit 2 satisfy the formula The widths C0, C1, C2, etc. of the second heat exchange channel 5 in the third heat exchange unit 3 satisfy the formula In fact, the values ​​of k1, k2, and k3 can be calculated using a two-dimensional steady-state design method based on the heat exchanger thermal design method to achieve the required heat transfer capacity. The values ​​of A0, B0, and C0 can be designed based on the pressure drop requirements.

[0053] Reference Figure 4As shown, along the second direction D2, a second mixing channel 7 is provided between two adjacent rows of heat exchange unit groups. The second mixing channel extends along the first direction D1. In the second direction D2, the first end and the second end of the second mixing channel 7 are arranged opposite to each other. The first end of the second mixing channel 7 is connected to the second heat exchange channel 5 in the previous heat exchange unit, and the outlets of all the second heat exchange channels 5 in the previous heat exchange unit are connected to the second mixing channel 7. The second end of the second mixing channel 7 is connected to the second heat exchange channel 5 in the next heat exchange unit, and the inlet of all the second heat exchange channels 5 in the next heat exchange unit are connected to the second mixing channel 7. The first mixing channel plays a role in evenly mixing the second fluid LT2.

[0054] In the embodiment provided in the present application, the second mixing channel 7 is used to mix the second fluid LT2 in the second heat exchange channel in the first heat exchange unit 1 and the third heat exchange unit 3 and then transport it to the second heat exchange channel of the second heat exchange unit 2. The amount of the second fluid LT2 in the second heat exchange channel of the second heat exchange unit 2 is the sum of the first heat exchange unit 1 and the third heat exchange unit 3, thereby improving the heat exchange effect. The setting of the second mixing channel 7 can, to a certain extent, play the role of mixing the second fluid LT2, so that the inlet temperature of the second fluid LT2 is more uniform, thereby making the outlet temperature more uniform.

[0055] Example 2

[0056] Reference Figure 5 as well as Figure 6 As shown, in this embodiment, along the first direction D1, in the first heat exchange channel group located in the row after the first mixing channel 6, the first heat exchange channel 4 at the end position has a first curved guide surface 8, and the first curved guide surface 8 is recessed toward the interior of the first heat exchange channel 4. In this embodiment, the first heat exchange channel 4 in the third heat exchange unit 3, which is away from the end in the second direction D2, is provided with a first curved guide surface 8. One end of the first curved guide surface 8 is connected to the end of the first mixing channel 6. After the first fluid LT1 flowing out of the first heat exchange channel 4 of the first heat exchange unit 1 and the second heat exchange channel 5 is mixed through the first mixing channel 6, it can reach the first heat exchange channel 4 in the third heat exchange unit 3 more quickly. Compared with a right-angle structure, this first curved guide surface 8 greatly reduces the pressure drop of the cross-flow heat exchanger. At the same time, the increase in heat exchange area also brings a certain amount of heat exchange gain.

[0057] Reference Figure 5 as well as Figure 7As shown, along the second direction D2, in the second heat exchange channel group located in the row after the second mixing channel 7, a second curved guide surface 9 is provided inside the second heat exchange channel 5 at the end position, and the second curved guide surface 9 is recessed toward the interior of the second heat exchange channel 5. In this embodiment, a second curved guide surface 9 is provided in the second heat exchange channel 5 of the second heat exchange unit 2 at the end away from the first direction D1. One end of the second curved guide surface 9 is connected to the end of the second mixing channel 7. After the second fluid LT2 flowing out of the second heat exchange channel 5 of the first heat exchange unit 1 and the third heat exchange channel is mixed in the second mixing channel, it can reach the second heat exchange channel 5 of the second heat exchange unit 2 more quickly. Compared with a right-angle structure, this second curved guide surface 9 can greatly reduce the pressure drop of the cross-flow heat exchanger. At the same time, the increase in heat exchange area will also bring a certain amount of heat exchange gain.

[0058] Moreover, the projections of the first arc-shaped guide surface 8 and the second arc-shaped guide surface 9 in the third direction coincide with each other, wherein the third direction is the vertical direction. In this way, the several first heat exchange channel groups and the several second heat exchange channel groups of each heat exchange unit of this embodiment can maintain the same size when cross-stacked, and form a regular "L"-shaped cross-flow heat exchanger.

[0059] The other structures of the cross-flow heat exchanger of this embodiment are the same as those of the first embodiment and will not be described again here.

[0060] Example 3

[0061] Reference Figures 8 to 10 As shown, in this embodiment, one end of the first arcuate guide surface 8 is not connected to the end of the first mixing channel 6, and one end of the second arcuate guide surface 9 is not connected to the end of the second mixing channel 7. The arc surface lengths of the first guide arc surface and the second guide arc surface are reduced compared to those in Example 2, which can reduce the manufacturing difficulty and the pressure drop.

[0062] The other structures of the cross-flow heat exchanger of this embodiment are the same as those of the second embodiment and will not be described again here.

[0063] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, but the scope of implementation of the present invention is not limited to what is shown in the drawings. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which do not exceed the spirit covered by the description and drawings, should be within the scope of protection of the present invention.

Claims

1. A cross-flow heat exchanger, characterized in that: It includes several heat exchange units distributed in an array, including: Along the inlet direction of the first fluid, the plurality of heat exchange units form a plurality of rows of first heat exchange unit groups, and the number of heat exchange units in each row of the first heat exchange unit group decreases sequentially; Along the inlet direction of the second fluid, the plurality of heat exchange units form a plurality of rows of second heat exchange unit groups, and the number of heat exchange units in each row of the second heat exchange unit group decreases sequentially.

2. The cross-flow heat exchanger according to claim 1, characterized in that The inlet direction of the first fluid is the transverse direction, the inlet direction of the second fluid is the longitudinal direction, and there is a temperature difference between the first fluid and the second fluid, and indirect heat exchange is performed.

3. The cross-flow heat exchanger according to claim 1, characterized in that Each of the heat exchange units has a plurality of first heat exchange channel groups and a plurality of second heat exchange channel groups. The plurality of first heat exchange channel groups and the plurality of second heat exchange channel groups are cross-stacked.

4. The cross-flow heat exchanger according to claim 3, characterized in that The fluid in the first heat exchange channel group flows along the direction of the first fluid inlet in which the heat exchange units decrease; the fluid in the second heat exchange channel group flows along the direction of the second fluid inlet in which the heat exchange units decrease.

5. The cross-flow heat exchanger according to claim 4, characterized in that The first heat exchange channel group has a plurality of first heat exchange channels, which are arranged in sequence along the inlet direction of the second fluid. Along the inlet direction of the second fluid, the channel widths of the plurality of first heat exchange channels in each first heat exchange channel group increase successively; the second heat exchange channel group has a plurality of second heat exchange channels, which are arranged in sequence along the inlet direction of the first fluid. Along the inlet direction of the first fluid, the channel widths of the plurality of second heat exchange channels in each second heat exchange channel group increase successively.

6. The cross-flow heat exchanger according to claim 5, characterized in that Along the inlet direction of the second fluid, the channel widths of the several first heat exchange channels of each first heat exchange channel group are arranged in a geometric progression; and along the inlet direction of the first fluid, the channel widths of the several second heat exchange channels of each second heat exchange channel group are arranged in a geometric progression.

7. The cross-flow heat exchanger according to claim 5, characterized in that Along the inlet direction of the first fluid, a first mixing channel is provided between two adjacent rows of the first heat exchange unit groups, and the first mixing channel is used to connect the first heat exchange channel groups of the heat exchange units of the two adjacent rows of the first heat exchange unit groups; along the inlet direction of the second fluid, a second mixing channel is provided between two adjacent rows of the second heat exchange unit groups, and the second mixing channel is used to connect the second heat exchange channel groups of the heat exchange units of the two adjacent rows of the second heat exchange unit groups.

8. The cross-flow heat exchanger according to claim 7, characterized in that The first heat exchange unit group located in the rear row of the first mixing channel has a first arc-shaped guide surface at an end portion where the heat exchange unit is reduced relative to the first heat exchange unit group located in the front row of the first mixing channel, and the first arc-shaped guide surface is concave toward the first mixing channel; The second heat exchange unit group located in the rear row of the second mixing channel has a second arc-shaped guide surface at the end where the heat exchange unit is reduced relative to the second heat exchange unit group located in the front row of the second mixing channel, and the second arc-shaped guide surface is concave toward the second mixing channel.

9. The cross-flow heat exchanger according to claim 8, characterized in that The projections of the first arc-shaped guiding surface and the second arc-shaped guiding surface in a third direction overlap, wherein the third direction is a vertical direction.

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