A heat exchange plate assembly of an air-type brazing plate heat exchanger for improving phase transition of a medium

Abstract

The utility model relates to a kind of heat exchange plate combination of air type brazing plate heat exchanger for improving medium phase change, belong to heat exchange technical field.The first heat exchange plate, second heat exchange plate one end is respectively set up fluid medium import;The first heat exchange plate, second heat exchange plate other end is set up fluid medium export;Fluid medium import cross section is greater than fluid medium export cross section;The included angle between the middle bottom surface of the second heat exchange plate and the horizontal plane is formed, the second heat exchange plate middle upper bottom surface is equipped with second point group and third point group;Second point group includes several second points of concave structure, the concave bottom surface of second point is at the same horizontal plane;Third point group includes several third points of convex structure, the convex top surface of third point is at the same horizontal plane.The fluid medium import side pressure of the application is higher than fluid medium export side pressure;Fluid medium passage flow cross-sectional area gradually decreases, and heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a heat exchange plate assembly for an air-type brazed plate heat exchanger that improves medium phase change, belonging to the field of heat exchange technology. 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. During operation, a fluid medium flows through one channel of the heat exchange plates, while air is blown into another channel outside the heat exchange plates. Air-type brazed plate heat exchangers with a large aspect ratio (15-25) offer a longer internal flow path and a larger ventilation surface compared to traditional air-type brazed plate heat exchangers, resulting in a greater airflow rate per unit time.

[0003] However, air-type brazed plate heat exchangers with a large aspect ratio have the following disadvantages when they need to release heat to high-temperature gases: after releasing heat during the heat transfer process, the high-temperature gas undergoes a phase change, gradually liquefying from a gaseous state to a liquid state, and its volume decreases accordingly. The flow characteristics also change, and the flow velocity gradually slows down, resulting in a decrease in the heat transfer coefficient and a decrease in the overall efficiency of the heat exchanger. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a heat exchange plate assembly for an air-type brazed plate heat exchanger that improves the phase change of the medium, in contrast to the above-mentioned prior art. The cross-sectional area of ​​the fluid medium inlet is larger than that of the fluid medium outlet, and the pressure on the fluid medium inlet side is higher than that on the fluid medium outlet side. The flow cross-sectional area of ​​the fluid medium channel from the fluid medium inlet to the fluid medium outlet gradually decreases, which improves the defect of the flow rate gradually slowing down after the gaseous medium liquefies, thereby improving the heat exchange efficiency.

[0005] The technical solution adopted by this utility model to solve the above problems is: a heat exchange plate assembly of an air-type brazed plate heat exchanger that improves medium phase change, comprising multiple sets of stacked heat exchange plate assemblies, each of the heat exchange plate assemblies comprising a first heat exchange plate and a second heat exchange plate, the gap between the first heat exchange plate and the second heat exchange plate below it forms a fluid medium channel, and the gap between the second heat exchange plate and the first heat exchange plate in the adjacent heat exchange plate assembly forms an air flow channel; The first heat exchange plate and the second heat exchange plate each have a fluid medium inlet at one end; the first heat exchange plate and the second heat exchange plate each have a fluid medium outlet at the other end; the cross-section of the fluid medium inlet is larger than the cross-section of the fluid medium outlet; the bottom surface of the first heat exchange plate has multiple sets of first point groups evenly distributed along the width direction. The bottom surface of the second heat exchange plate forms an angle with the horizontal plane. The upper bottom surface of the second heat exchange plate is provided with multiple sets of second point groups and third point groups arranged along the width direction. The second point groups are located above the third point groups, and the second point groups and third point groups are arranged alternately. Each of the second point groups includes several second point positions with concave structures, and the concave bottom surfaces of several second point positions are on the same horizontal plane. Each of the third point groups includes several third point positions with convex structures, and the convex top surfaces of several third point positions are on the same horizontal plane.

[0006] The fluid medium inlet is elliptical, and the fluid medium outlet is circular.

[0007] The first point group includes several first points arranged along the length of the first heat exchange plate, and the first point is a convex structure.

[0008] The depth of the second point near the fluid medium inlet of the second heat exchange plate is less than the depth of the second point near the fluid medium outlet of the second heat exchange plate, and the depth of the second point gradually increases; the height of the third point near the fluid medium inlet of the second heat exchange plate is greater than the height of the third point near the fluid medium outlet of the second heat exchange plate, and the height of the third point gradually decreases.

[0009] The fluid medium inlet and fluid medium outlet on the first heat exchange plate each have an annular first sealing protrusion on their outer periphery, and the first sealing protrusion is provided with a plurality of annularly distributed first concave weld points; the fluid medium inlet and fluid medium outlet on the second heat exchange plate each have an annular first sealing groove on their outer periphery, and the first sealing protrusion matches the first sealing groove; the first sealing groove is provided with a plurality of annularly distributed first convex weld points, and the first convex weld points correspond to the first concave weld points.

[0010] The first heat exchange plate has a number of second protruding weld points symmetrically arranged at intervals along its two long edges. The second heat exchange plate has second sealing protrusions along its four perimeters. The top surface of the second sealing protrusions is flush with the top surface of the third point group. The second sealing protrusions have a number of second concave weld points symmetrically arranged along their two long edges. The second concave weld points correspond to the second protruding weld points.

[0011] The first heat exchange plate has a first flange at each end, and the second heat exchange plate has a second flange at each end, with the first flange and the second flange engaging with each other.

[0012] Compared with the prior art, the advantages of this utility model are as follows: A heat exchange plate assembly for an air-type brazed plate heat exchanger that improves medium phase change has a fluid medium inlet cross-sectional area larger than the fluid medium outlet cross-sectional area, resulting in a fluid medium inlet pressure greater than the fluid medium outlet pressure. The design of the bottom surface of the middle part of the second heat exchange plate having an incline, two convex points with varying heights (the highest surfaces of several second points are located on the same horizontal plane), and three concave points with varying depths (the lowest surfaces of several third points are located on the same horizontal plane) not only meets the plate assembly requirements but also changes the cross-sectional area of ​​the fluid medium channel: the flow cross-sectional area of ​​the fluid medium channel from the fluid medium inlet to the fluid medium outlet gradually decreases, improving the defect of the flow rate gradually slowing down after the gaseous medium liquefies, thereby improving the heat exchange efficiency. Attached Figure Description

[0013] Figure 1 This is a three-dimensional view of the first heat exchange plate in the heat exchange plate assembly of an air-type brazed plate heat exchanger for improving medium phase change, according to an embodiment of the present invention. Figure 2 This is a three-dimensional view of the second heat exchange plate in a heat exchange plate assembly of an air-type brazed plate heat exchanger for improving medium phase change, according to an embodiment of this utility model. Figure 3 for Figure 1 The front view; Figure 4 for Figure 2 The front view; Figure 5 This is a three-dimensional schematic diagram of two sets of heat exchanger plates; Figure 6 Cross-sectional view of the two heat exchanger assemblies (cut open at the third point); Figure 7 Cross-sectional view of the two heat exchanger plate groups (cut open at the second point); Figure 8 for Figure 6 and Figure 7 A combined cross-sectional view of the two sections; In the figure, 1 is the first heat exchange plate, 2 is the second heat exchange plate, 3 is the first point, 4 is the second raised weld point, 5 is the fluid medium inlet, 6 is the fluid medium outlet, 7 is the first sealing protrusion, 8 is the first flange, 9 is the middle bottom surface of the second heat exchange plate, 10 is the second point, 11 is the third point, 12 is the second sealing protrusion, 13 is the second concave weld point, 14 is the first raised weld point, 15 is the second flange, 121 is the fluid medium flow channel, and 212 is the air flow channel. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0015] like Figure 1 ,2 As shown in Figures 7 and 8, the heat exchanger plate assembly of an air-type brazed plate heat exchanger for improving medium phase change in this embodiment includes multiple sets of stacked heat exchanger plate groups. Each heat exchanger plate group includes a first heat exchanger plate 1 and a second heat exchanger plate 2. The first heat exchanger plate is placed on top and the second heat exchanger plate is placed on the bottom as a heat exchanger plate group. The gap between the first heat exchanger plate and the second heat exchanger plate below forms a fluid medium channel 121. The gap between the second heat exchanger plate and the first heat exchanger plate in the adjacent heat exchanger plate group forms an air flow channel 212.

[0016] like Figure 3 , 4 As shown, elliptical fluid medium inlets 5 are respectively opened at one end of the first heat exchange plate 1 and the second heat exchange plate 2; circular fluid medium outlets 6 are respectively opened at the other end of the first heat exchange plate and the second heat exchange plate. The cross-sectional area of ​​the fluid medium inlet is larger than that of the fluid medium outlet, which causes the fluid medium to accelerate after entering the heat exchanger, and at the same time, the fluid medium pressure decreases, that is, the pressure on the fluid medium inlet side is higher than that on the fluid medium outlet side.

[0017] The bottom surface of the first heat exchange plate 1 is provided with multiple sets of first point groups evenly distributed along the width direction. Each first point group includes several first points 3 arranged along the length direction of the first heat exchange plate, and the first point 3 is a convex structure.

[0018] The middle bottom surface 9 of the second heat exchange plate has an upward slope, forming an angle between the middle bottom surface 9 and the horizontal plane. Multiple sets of second and third point groups are arranged along the width direction on the middle upper bottom surface of the second heat exchange plate, with the second point groups positioned above the third point groups, and the second and third point groups alternating in arrangement. Each second point group includes several concave second points 10, arranged along the length direction of the second heat exchange plate. The concavity depth of the second points near the fluid medium inlet of the second heat exchange plate is less than that near the fluid medium outlet of the second heat exchange plate, and the concavity depth of the several second points gradually increases, so that the bottom surfaces of the several concave second points are at the same horizontal plane. The third point group includes several convex third points 11, arranged along the length direction of the second heat exchange plate. The height of the convex surface at the third point near the fluid medium inlet of the second heat exchange plate is greater than that at the third point near the fluid medium outlet of the second heat exchange plate. The height of the convex surface at several second points gradually decreases, so that the top surfaces of the convex surfaces at several third points are at the same horizontal plane.

[0019] The first heat exchange plate has annular first sealing protrusions 7 on the outer periphery of both the fluid medium inlet and outlet. Multiple circumferentially distributed first concave weld points are provided on the first sealing protrusions. Several spaced second protruding weld points 4 are symmetrically arranged along the two long edges of the first heat exchange plate. The second heat exchange plate has annular first sealing grooves on the outer periphery of both the fluid medium inlet and outlet. The first sealing protrusions 7 match the first sealing grooves. Multiple circumferentially arranged first protruding weld points 14 are provided on the first sealing grooves, corresponding to the first concave weld points. The second heat exchange plate has second sealing protrusions 12 around its periphery, with the top surface of the second sealing protrusions 12 flush with the top surface of the third point group. Several second concave weld points 13 are symmetrically arranged along the two long edges of the second sealing protrusions 12, corresponding to the second protruding weld points.

[0020] The first heat exchange plate has a first flange 8 at each end, and the second heat exchange plate has a second flange 15 at each end. The first flange 8 and the second flange 15 are interlocked and serve as a limiting element during assembly.

[0021] like Figure 6 , 7 As shown, when the first heat exchange plate is on top and the second heat exchange plate is on the bottom, the bottom surface of the middle part of the first heat exchange plate is in contact with the top surface of the third point, and the bottom surface of the second point on the second heat exchange plate is in contact with the top surface of the first point on the adjacent first heat exchange plate. The bottom surface of the four perimeters of the first heat exchange plate is in contact with the top surface of the second sealing protrusion of the second heat exchange plate. The second convex weld point of the first heat exchange plate is aligned with the second concave weld point of the second heat exchange plate, and the bottom surface of the second concave weld point of the second heat exchange plate is in contact with and welded to the top surface of the second convex weld point on the adjacent first heat exchange plate. The first sealing protrusion on the first heat exchange plate is aligned with the first sealing groove on the second heat exchange plate, and the bottom surface of the first concave weld point is in contact with and welded to the top surface of the first convex weld point. The bottom surface of the first sealing groove on the second heat exchange plate is in contact with and welded to the first sealing protrusion on the adjacent first heat exchange plate, and the first convex weld point on the second heat exchange plate is in contact with the first concave weld point on the adjacent first heat exchange plate.

[0022] like Figure 8 As shown, the distance between the convex top surface at the third point on the second heat exchange plate and the bottom surface of the middle part of the second heat exchange plate is represented by H1, and the distance between the concave bottom surface at the second point on the second heat exchange plate and the bottom surface of the middle part of the second heat exchange plate is represented by H2. Since the bottom surface of the middle part of the second heat exchange plate tends to rise, H1 becomes smaller and smaller than H2, thereby causing the cross-sectional area of ​​the fluid medium channel to gradually decrease, that is, S2 is smaller than S1 in the figure.

[0023] When the air-type brazed plate heat exchanger is working, a large amount of air enters the air channel from one of the long sides of the plate heat exchanger, and the fluid medium enters the fluid medium channel from the fluid medium inlet. The two media undergo indirect heat exchange inside the plate heat exchanger. After absorbing heat, the air flows out from the other long side of the plate heat exchanger, and after releasing heat, the fluid medium flows out from the fluid medium outlet, completing the heat exchange. In this application, the cross-sectional area of ​​the fluid medium inlet is larger than that of the fluid medium outlet, which makes the fluid medium inlet pressure greater than that of the fluid medium outlet pressure, thus accelerating the flow velocity of the fluid medium upon entry. The design of the bottom surface of the middle part of the second heat exchange plate having a slope, second points with varying upward convex heights (the highest surfaces of several second points are located on the same horizontal plane), and third points with varying downward concave depths (the lowest surfaces of several third points are located on the same horizontal plane) not only meets the plate assembly requirements but also changes the cross-sectional area of ​​the fluid medium channel: the flow cross-sectional area of ​​the fluid medium channel from the fluid medium inlet to the fluid medium outlet gradually decreases, improving the defect of the flow velocity gradually slowing down after the gaseous medium liquefies, thereby improving the heat exchange efficiency.

[0024] 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 heat exchanger plate assembly for an air-type brazed plate heat exchanger that improves medium phase change, characterized in that: It includes multiple sets of stacked heat exchange plate groups, each of which includes a first heat exchange plate and a second heat exchange plate. The gap between the first heat exchange plate and the second heat exchange plate below it forms a fluid medium channel, and the gap between the second heat exchange plate and the first heat exchange plate in the adjacent heat exchange plate group forms an air flow channel. The first heat exchange plate and the second heat exchange plate each have a fluid medium inlet at one end; the first heat exchange plate and the second heat exchange plate each have a fluid medium outlet at the other end; the cross-section of the fluid medium inlet is larger than the cross-section of the fluid medium outlet. The bottom surface of the first heat exchange plate is provided with multiple sets of first point positions evenly distributed along the width direction. The bottom surface of the second heat exchange plate forms an angle with the horizontal plane. The upper bottom surface of the second heat exchange plate is provided with multiple sets of second point groups and third point groups arranged along the width direction. The second point groups are located above the third point groups, and the second point groups and third point groups are arranged alternately. Each of the second point groups includes several second point positions with concave structures, and the concave bottom surfaces of several second point positions are on the same horizontal plane. Each of the third point groups includes several third point positions with convex structures, and the convex top surfaces of several third point positions are on the same horizontal plane.

2. The heat exchanger plate assembly of an air-type brazed plate heat exchanger for improving medium phase change according to claim 1, characterized in that: The fluid medium inlet is elliptical, and the fluid medium outlet is circular.

3. The heat exchanger plate assembly of an air-type brazed plate heat exchanger for improving medium phase change according to claim 2, characterized in that: The first point group includes several first points arranged along the length of the first heat exchange plate, and the first point is a convex structure.

4. The heat exchanger plate assembly of an air-type brazed plate heat exchanger for improving medium phase change according to claim 2, characterized in that: The depth of the second point near the fluid medium inlet of the second heat exchange plate is less than the depth of the second point near the fluid medium outlet of the second heat exchange plate, and the depth of the second point gradually increases; the height of the third point near the fluid medium inlet of the second heat exchange plate is greater than the height of the third point near the fluid medium outlet of the second heat exchange plate, and the height of the third point gradually decreases.

5. The heat exchanger plate assembly of an air-type brazed plate heat exchanger for improving medium phase change according to claim 1, characterized in that: The fluid medium inlet and fluid medium outlet on the first heat exchange plate each have an annular first sealing protrusion on their outer periphery, and the first sealing protrusion is provided with a plurality of annularly distributed first concave weld points. The fluid medium inlet and fluid medium outlet on the second heat exchange plate each have an annular first sealing groove on their outer periphery, and the first sealing protrusion matches the first sealing groove; the first sealing groove is provided with a plurality of circumferentially distributed first protruding weld points, and the first protruding weld points correspond to the first concave weld points.

6. The heat exchanger plate assembly of an air-type brazed plate heat exchanger for improving medium phase change according to claim 1, characterized in that: The first heat exchange plate has a number of second protruding weld points symmetrically arranged at intervals along its two long edges. The second heat exchange plate has second sealing protrusions along its four perimeters. The top surface of the second sealing protrusions is flush with the top surface of the third point group. The second sealing protrusions have a number of second concave weld points symmetrically arranged along their two long edges. The second concave weld points correspond to the second protruding weld points.

7. The heat exchanger plate assembly of an air-type brazed plate heat exchanger for improving medium phase change according to claim 1, characterized in that: The first heat exchange plate has a first flange at each end, and the second heat exchange plate has a second flange at each end, with the first flange and the second flange engaging with each other.

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