Air brazing plate heat exchanger with large length-width ratio

Abstract

The utility model relates to a kind of big length-width ratio air type brazing plate heat exchanger, belong to plate heat exchanger technical field. Including front end plate and rear end plate, the front end plate and rear end plate between being equipped with several heat exchange plate groups, the front end plate side surface is connected two connecting pipes: fluid medium import connecting pipe and fluid medium export connecting pipe, the heat exchange plate group one end is opened fluid medium import, and the other end is opened fluid medium export;Any the heat exchange plate group is respectively including first heat exchange plate and second heat exchange plate, the gap between the first heat exchange plate and the second heat exchange plate below forms fluid medium flow channel, the gap between the second heat exchange plate and the first heat exchange plate above between adjacent group forms air flow channel;The size length-width ratio of the front end plate, heat exchange plate group and rear end plate is 15­25.This application improves the length-width ratio of heat exchange plate group, increases ventilation surface, improves the air intake in unit time.

Description

Technical Field

[0001] This utility model relates to an air-brazed plate heat exchanger with a large aspect ratio, belonging to the technical field of plate heat exchangers. Background Technology

[0002] An air-type brazed plate heat exchanger is a heat exchange device that uses air as a coolant or heat source to cool or heat the medium inside the heat exchanger. It mainly consists of front and rear end plates, heat exchange plates, and brazing filler metal. During operation, a fluid medium flows in the fluid medium channel, while air is blown into the air channel outside the heat exchange plates. The type and number of heat exchange plates have a significant impact on the performance of the air cooler.

[0003] Air-type brazed plate heat exchangers typically have an aspect ratio of less than 5. From a heat transfer perspective, the specific heat of air is only 1 / 4 that of water, and the density of air is also much lower than that of water. Therefore, to transfer the same amount of heat and achieve the same temperature rise in the cooling medium, the required amount of air would be four times that of water. Crucially, the heat transfer coefficient on the air side is very low, approximately 50–60 W / (m²). 2 Because the air-type brazed plate heat exchanger has a very small aspect ratio (°C), the air intake per unit time is too small, resulting in extremely low heat exchange efficiency. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an air-type brazed plate heat exchanger with a large aspect ratio, which improves the aspect ratio, increases the flow length of the ventilation surface and the inner cavity of the heat exchange plate, thereby increasing the air intake per unit time and improving the heat exchange efficiency.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: a large aspect ratio air-type brazed plate heat exchanger, including a front end plate and a rear end plate, wherein a plurality of heat exchange plate groups are arranged in sequence between the front end plate and the rear end plate, and two pipes are connected to the side of the front end plate: a fluid medium inlet pipe and a fluid medium outlet pipe. One end of each heat exchange plate group has a fluid medium inlet and the other end has a fluid medium outlet. The fluid medium inlet pipe is connected to the fluid medium inlet, and the fluid medium outlet pipe is connected to the fluid medium outlet. Each heat exchange plate group includes a first heat exchange plate and a second heat exchange plate. The heat exchanger consists of a plate, with a gap between the first heat exchanger plate and the second heat exchanger plate below forming a fluid medium flow channel, and a gap between the second heat exchanger plate and the first heat exchanger plate above the adjacent heat exchanger plate group forming an air flow channel. The fluid medium inlet, fluid medium flow channel, and fluid medium outlet are interconnected. A large amount of cold air enters the air flow channel from one side of the long side of the heat exchanger plate group, and the high-temperature fluid medium enters the fluid medium channel through the fluid medium inlet pipe. The two media undergo indirect heat exchange. After the cold air absorbs heat, it flows out from the other side of the long side of the heat exchanger plate group, and after the high-temperature fluid medium releases heat, it flows out through the fluid medium outlet pipe, thus completing the heat exchange.

[0006] The aspect ratio of the front-end plate, heat exchange plate assembly, and rear-end plate is 1525.

[0007] Each of the first heat exchange plates has multiple sets of parallel first point groups and second point groups on its surface. The second point groups are arranged parallel to each other below the first point groups, and the two are arranged alternately along the width direction of the first heat exchange plate. The first point group includes several first points arranged along the length direction of the first heat exchange plate, and the second point group includes several second points arranged along the length direction of the first heat exchange plate. Take two first points or two second points from any group of the first heat exchange plate, and then take a second point or a first point from an adjacent group to form an isosceles triangle of first point combination.

[0008] The first heat exchange plate has first through holes at both ends: a fluid medium inlet and a fluid medium outlet. The edges of the first through holes each have an annular first sealing protrusion. The top surface of the first sealing protrusion is provided with multiple first concave weld points. The long edge of the first heat exchange plate is symmetrically provided with multiple second convex weld points. The distance between the first point group near the long edge of the first heat exchange plate and the corresponding side of the long edge of the first heat exchange plate is equal, or the distance between the second point group near the long edge of the first heat exchange plate and the corresponding side of the long edge of the first heat exchange plate is equal, and the distance between the first point group and the second point group is equal.

[0009] The surface of the second heat exchange plate is provided with multiple sets of parallel third point groups and fourth point groups, with the fourth point groups located below the third point groups. The two are arranged alternately along the width direction of the second heat exchange plate. The first point groups and second point groups on the first heat exchange plate are respectively aligned with the third point groups on the lower second heat exchange plate. The fourth point groups on the second heat exchange plate are attached to and welded to the bottom surface of the first heat exchange plate in the adjacent heat exchange plate group. The third point group includes several third points arranged along the length direction of the second heat exchange plate. The fourth point group includes several fourth points arranged along the length direction of the second heat exchange plate. Two fourth points from any group in the second heat exchange plate are taken, and one adjacent fourth point from an adjacent group is taken. The three fourth points form an isosceles triangle combination of the second point groups.

[0010] The second heat exchange plate has second through holes at both ends: a fluid medium inlet and a fluid medium outlet. The top edge of the second through hole has an annular second sealing groove, and the top surface of the second sealing groove has multiple first protruding weld points. The surface edge of the second heat exchange plate has a second sealing protrusion, and several evenly distributed second concave weld points are symmetrically arranged on the two long sides of the second sealing protrusion. The distance between a group of third points near the second sealing protrusion and the corresponding second sealing protrusion is equal to the distance between another group of third points near the second sealing protrusion and the corresponding second sealing protrusion. The distance between the two groups of fourth points near the second sealing protrusion and the corresponding second sealing protrusion is equal. The row spacing between two adjacent groups of third points is equal, and the row spacing between two adjacent groups of fourth points is equal.

[0011] Compared with the prior art, the advantages of this utility model are: a large aspect ratio air brazed plate heat exchanger, which improves the aspect ratio of the heat exchange plate group, increases the ventilation surface, increases the air intake per unit time, and improves the heat exchange efficiency by lengthening the air flow through the design of the heat exchange plate points. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of an air-brazed plate heat exchanger with a large aspect ratio according to an embodiment of the present invention; Figure 2 for Figure 1 The main view; Figure 3 for Figure 2 Sectional view of AA; Figure 4 for Figure 2 BB section view; Figure 5 This is a three-dimensional schematic diagram of the heat exchanger plate assembly; Figure 6 This is a three-dimensional schematic diagram of the first heat exchange plate; Figure 7 This is a three-dimensional schematic diagram of the second heat exchange plate; Figure 8 for Figure 6 Top view; Figure 9 for Figure 7 Top view; Figure 10 for Figure 9 CC section view; In the diagram: 1. Front end plate; 2. Rear end plate; 3. Fluid medium inlet pipe; 4. Fluid medium outlet pipe; 5. First heat exchange plate; 5.1 First point; 5.2 Second point; 5.3 Second raised weld point; 5.4 First through hole; 5.5 First concave weld point; 5.6 First flange; 5.7 First sealing protrusion; 6. First copper foil; 7. Second heat exchange plate; 7.1 Third point; 7.2 Fourth point; 7.3 Second concave weld point; 7.4 Second through hole; 7.5 First raised weld point; 7.6 Second flange; 7.7 Second sealing groove; 7.8 Second sealing protrusion; 8. Second copper foil; 9. Fluid medium flow channel; 10. Air flow channel; 11. Straight flow direction; 12. Curved flow direction; 13. Air inflow direction; 14. Air outflow direction; 15. First point combination; 16. Second point combination; 17. Fluid medium inflow direction. Detailed Implementation

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0014] like Figure 1-4 As shown in this embodiment, a high aspect ratio air-type brazed plate heat exchanger includes a front plate 1 and a rear plate 2. A plurality of sequentially stacked heat exchange plate groups are arranged between the front plate 1 and the rear plate 2. A front copper foil is provided between the front plate 1 and the first heat exchange plate group, and a rear copper foil is provided between the last heat exchange plate group and the rear plate 2. The front plate, heat exchange plate groups, and rear plate are brazed together. Each heat exchange plate group includes a first heat exchange plate 5 and a second heat exchange plate 7. A first copper foil 6 is provided between the first heat exchange plate 5 and the second heat exchange plate 7. A second copper foil 8 is provided between the second heat exchange plate 7 and the first heat exchange plate 5 of the adjacent heat exchange plate group. The first heat exchange plate and the second heat exchange plate are connected by brazing.

[0015] like Figure 5 As shown, a heat exchange plate group is formed with the first heat exchange plate on top and the second heat exchange plate on the bottom. The gap between the first heat exchange plate 5 and the second heat exchange plate 7 below it forms a fluid medium flow channel 9, and the gap between the second heat exchange plate and the first heat exchange plate above the adjacent heat exchange plate group forms an air flow channel 10. Two pipes are connected to both ends of the front end plate 1: a fluid medium inlet pipe 3 and a fluid medium outlet pipe 4. A fluid medium inlet and a fluid medium outlet are respectively opened at both ends of any heat exchange plate group. The fluid medium inlet pipe 3 is connected to the fluid medium inlet, and the fluid medium outlet pipe 4 is connected to the fluid medium outlet. The fluid medium inlet, fluid medium flow channel 9 and fluid medium outlet are connected. A large amount of cold air flows into the air flow channel 10 through one side of the long side of the heat exchange plate group, and the high-temperature fluid medium enters the fluid medium channel 11 through the fluid medium inlet pipe 3. The two media, cold air and high-temperature fluid medium, undergo indirect heat exchange. After absorbing heat, the cold air flows out from the other side of the long side of the heat exchange plate group, and after releasing heat, the high-temperature fluid medium flows out through the fluid medium outlet pipe, thus completing the heat exchange.

[0016] The aspect ratio of the front end plate 1, the first heat exchange plate 5, the second heat exchange plate 7 and the rear end plate 2 is 1525, which makes the internal flow of the heat exchange plate group long enough. The narrow and long heat exchange plate group design can effectively reduce the side flow problem of the fluid and make full use of the fluid medium channel to make the fluid circulate evenly. The air intake volume per unit time is larger and the ventilation surface is large enough, thereby improving the heat transfer effect.

[0017] The large aspect ratio of the air-brazed plate heat exchanger design is more conducive to nickel plating, which helps the heat exchanger maintain its performance and lifespan during long-term use and improves the mechanical strength of the heat exchanger.

[0018] like Figure 6 , 8 As shown, each of the first heat exchange plates 5 has multiple sets of parallel first point groups and second point groups on its surface. The second point groups are located below the first point groups, and the first and second point groups are arranged alternately along the width direction of the first heat exchange plate 5. The first point group includes several first points 5.1 arranged along the length direction of the first heat exchange plate, and the second point group includes several second points 5.2 arranged along the length direction of the first heat exchange plate. Both the first and second points are convex structures. First through holes 5.4 are respectively opened at both ends of the first heat exchange plate: a fluid medium inlet and a fluid medium outlet. The edges of the first through holes 5.4 each have annular first sealing protrusions 5.7, and the top surface of the first sealing protrusions 5.7 has multiple first concave weld points 5.5. Multiple second convex weld points 5.3 are symmetrically arranged along the long edge of the first heat exchange plate.

[0019] The distance between the first point group near the long edge of the first heat exchange plate and the corresponding long edge of the first heat exchange plate is equal, or the distance between the second point group near the long edge of the first heat exchange plate and the corresponding long edge of the first heat exchange plate is equal, and the distance between the first point group and the second point group is equal.

[0020] The air inflow direction 13 is shown on one long side of the upper surface of the first heat exchange plate, and the air outflow direction 14 is shown on the other long side of the upper surface of the first heat exchange plate. The flow arrows simulate the process of some cold air traveling in the air channel.

[0021] Take two first points 5.1 or two second points 5.2 from any row of the first heat exchange plate, and then take one adjacent second point 5.2 or one first point 5.1 from the adjacent row. That is, two first points and one second point or two second points and one first point form a first point combination 15. The first point combination formed by the two first points and one second point (or the two second points and one first point) is an isosceles triangle.

[0022] like Figure 7 , 9As shown in Figure 10, the surface of the second heat exchange plate 7 is provided with multiple sets of parallel arranged third point groups and fourth point groups, with the fourth point groups located below the third point groups. The third and fourth point groups are arranged alternately along the width direction of the second heat exchange plate. The third point group includes several third points 7.1 arranged along the length direction of the second heat exchange plate, and the fourth point group includes several fourth points 7.2 arranged along the length direction of the second heat exchange plate. The third points have a groove structure, and the fourth points have a convex structure. Second through holes 7.4 are respectively opened at both ends of the second heat exchange plate 7: a fluid medium inlet and a fluid medium outlet. The top edge of the second through hole 7.4 has an annular second sealing groove 7.7, and the top surface of the second sealing groove 7.7 is provided with multiple first protruding weld points 7.5 circumferentially. When the first heat exchange plate is on top and the second heat exchange plate is on the bottom, the first sealing protrusion 5.7 on the first heat exchange plate aligns with the second sealing groove 7.7 on the second heat exchange plate, and the bottom surface of the first concave weld point 5.5 is attached to and welded to the first convex weld point 7.5 to form a weld point; the bottom surface of the second sealing groove 7.7 on the second heat exchange plate 7 is attached to and welded to the first sealing protrusion 5.7 on the adjacent first heat exchange plate to form a sealing surface.

[0023] The second heat exchange plate has a second sealing protrusion 7.8 on its surface edge, and several second concave weld points 7.3 are symmetrically formed on the two long sides of the second sealing protrusion 7.8. When the first heat exchange plate 5 is on top and the second heat exchange plate 7 is below, forming the same group, the second protruding weld point 5.3 of the first heat exchange plate 5 and the second concave weld point 7.3 of the second heat exchange plate are aligned and welded together, and the bottom surface of the first heat exchange plate is attached to and welded to the second sealing protrusion 7.8 to form another sealing surface; the second concave weld point 7.3 of the second heat exchange plate is attached to and welded to the second protruding weld point 5.3 of the first heat exchange plate in the adjacent group to form another weld point.

[0024] The first and second point groups on the first heat exchange plate in the same group are respectively aligned with the third point group on the second heat exchange plate, and the fourth point group on the second heat exchange plate is attached to and welded to the bottom surface of the first heat exchange plate in the adjacent heat exchange plate group.

[0025] The distance between the group of third points closest to the second sealing protrusion and the corresponding second sealing protrusion is L1; the distance between the other group of third points closest to the second sealing protrusion and the corresponding second sealing protrusion is L2. Since L1 and L2 are equal, the stress distribution is more uniform, effectively solving the problem of the heat exchanger being prone to bending and deformation. The distances between the two groups of fourth points closest to the second sealing protrusion and the corresponding second sealing protrusion are equal. The row spacing between adjacent groups of third points is equal, and the row spacing between adjacent groups of fourth points is equal.

[0026] Take two fourth points from any row of the second heat exchange plate, and then take one adjacent fourth point from the next row, forming a second point combination 16 from these three fourth points. This second point combination forms an isosceles triangle structure.

[0027] The triangular structure formed by the combination of the first and second points has a stable structure. Due to the obstruction of the fixed points of the triangle, the air flow in the air channel changes direction from a straight flow direction 11 to a curved flow direction 12. The length ratio of the curved flow direction to the straight flow direction is greater than 1.1, thereby increasing the air travel distance in the heat exchanger (lengthening the air flow path) and improving the heat exchange efficiency by at least 10%.

[0028] The outer ring of the second through hole on the surface of the second heat exchange plate shows the flow direction of the fluid medium 17, and the flow direction arrow simulates the process of part of the fluid medium traveling in the fluid medium channel.

[0029] The first heat exchange plate has a first flange 5.6 at both ends, and the second heat exchange plate has a second flange 7.6 at both ends of the wide side. The first flange and the second flange play a limiting role during the assembly of the heat exchange plates and assist in the assembly.

[0030] Working principle: When the heat exchanger plate assembly is installed as a plate heat exchanger, several sets of heat exchanger plates are stacked in sequence, consisting of a first heat exchanger plate, a first copper foil, a second heat exchanger plate, and a second copper foil. During operation of the air-type brazed plate heat exchanger, a large amount of cold air enters the airflow channel from one long side of the heat exchanger plate assembly. Due to the design of the plate points, the airflow path is lengthened. The fluid medium enters the fluid medium channel through the fluid medium inlet pipe. The two media undergo indirect heat exchange inside the heat exchanger. After absorbing heat, the cold air flows out from the other long side of the heat exchanger plate assembly, and after releasing heat, the fluid medium flows out from the fluid medium outlet pipe, completing the heat exchange process.

[0031] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A high aspect ratio air-type brazed plate heat exchanger, characterized in that: The system includes a front-end plate and a rear-end plate, with several heat exchange plate assemblies stacked sequentially between them. The front-end plate has two connecting pipes on its side: a fluid medium inlet pipe and a fluid medium outlet pipe. Each heat exchange plate assembly has a fluid medium inlet at one end and a fluid medium outlet at the other. The fluid medium inlet pipe communicates with the fluid medium inlet, and the fluid medium outlet pipe communicates with the fluid medium outlet. Each heat exchange plate assembly includes a first heat exchange plate and a second heat exchange plate. A fluid medium flow channel is formed between the first heat exchange plate and the second heat exchange plate below it, and an air flow channel is formed between the second heat exchange plate and the first heat exchange plate above the adjacent heat exchange plate assembly. The fluid medium inlet, fluid medium flow channel, and fluid medium outlet are interconnected. A large amount of cold air enters the air flow channel from one side of the long side of the heat exchange plate assembly, while high-temperature fluid medium enters the fluid medium channel through the fluid medium inlet pipe. The two media undergo indirect heat exchange. After absorbing heat, the cold air flows out from the other side of the long side of the heat exchange plate assembly, and after releasing heat, the high-temperature fluid medium flows out through the fluid medium outlet pipe, completing the heat exchange.

2. The air-type brazed plate heat exchanger with a large aspect ratio according to claim 1, characterized in that: The aspect ratio of the front-end plate, heat exchange plate assembly, and rear-end plate is 1525.

3. The air-type brazed plate heat exchanger with a large aspect ratio according to claim 1, characterized in that: Each of the first heat exchange plates has multiple sets of parallel first point groups and second point groups on its surface. The second point groups are arranged parallel to each other below the first point groups, and the two are arranged alternately along the width direction of the first heat exchange plate. The first point group includes several first points arranged along the length direction of the first heat exchange plate, and the second point group includes several second points arranged along the length direction of the first heat exchange plate. Take two first points or two second points from any group of the first heat exchange plate, and then take a second point or a first point from an adjacent group to form an isosceles triangle of first point combination.

4. The air-type brazed plate heat exchanger with a large aspect ratio according to claim 3, characterized in that: The first heat exchange plate has first through holes at both ends: a fluid medium inlet and a fluid medium outlet. The edges of the first through holes each have an annular first sealing protrusion. The top surface of the first sealing protrusion is provided with multiple first concave weld points. The long edge of the first heat exchange plate is symmetrically provided with multiple second convex weld points. The distance between the first point group near the long edge of the first heat exchange plate and the corresponding side of the long edge of the first heat exchange plate is equal, or the distance between the second point group near the long edge of the first heat exchange plate and the corresponding side of the long edge of the first heat exchange plate is equal, and the distance between the first point group and the second point group is equal.

5. A large aspect ratio air-type brazed plate heat exchanger according to claim 1, characterized in that: The surface of the second heat exchange plate is provided with multiple sets of parallel third point groups and fourth point groups, with the fourth point groups located below the third point groups. The two are arranged alternately along the width direction of the second heat exchange plate. The first point groups and second point groups on the first heat exchange plate are respectively aligned with the third point groups on the lower second heat exchange plate. The fourth point groups on the second heat exchange plate are attached to and welded to the bottom surface of the first heat exchange plate in the adjacent heat exchange plate group. The third point group includes several third points arranged along the length direction of the second heat exchange plate. The fourth point group includes several fourth points arranged along the length direction of the second heat exchange plate. Two fourth points from any group in the second heat exchange plate are taken, and one adjacent fourth point from an adjacent group is taken. The three fourth points form an isosceles triangle combination of the second point groups.

6. A large aspect ratio air-type brazed plate heat exchanger according to claim 5, characterized in that: The second heat exchange plate has second through holes at both ends: a fluid medium inlet and a fluid medium outlet. The top edge of the second through hole has an annular second sealing groove, and the top surface of the second sealing groove has multiple first protruding weld points. The surface edge of the second heat exchange plate has a second sealing protrusion, and several evenly distributed second concave weld points are symmetrically arranged on the two long sides of the second sealing protrusion. The distance between a group of third points near the second sealing protrusion and the corresponding second sealing protrusion is equal to the distance between another group of third points near the second sealing protrusion and the corresponding second sealing protrusion. The distance between the two groups of fourth points near the second sealing protrusion and the corresponding second sealing protrusion is equal. The row spacing between two adjacent groups of third points is equal, and the row spacing between two adjacent groups of fourth points is equal.

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