Plate heat exchanger

Abstract

The application relates to a plate heat exchanger, which comprises a plurality of integrally formed heat exchange plates, and the plurality of heat exchange plates are stacked. The heat exchange plates are divided into a plurality of partition units, the orthographic projection of a single partition unit in a horizontal plane is a rectangle, the length of the orthographic projection of the single partition unit in the horizontal plane is x0, and the width of the orthographic projection of the single partition unit in the horizontal plane is y0. A three-dimensional coordinate system is established based on the single partition unit, one long side of the partition unit is coincident with the x-axis, one wide side of the partition unit is coincident with the y-axis, and the functional relationship of the partition unit in the three-dimensional coordinate system is: y=ax+b, wherein 0<=x<=x0, 0<=y<=y0, 1<=a<=5, 1<=b<=5, and the fluid flows along the x-axis direction in the cold flow channel and the hot flow channel. The plate heat exchanger provided by the application solves the problem that the existing spherical convex points easily cause the formation of a low-pressure area behind the convex points, thereby significantly increasing the fluid flow resistance.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and in particular to a plate heat exchanger. Background Technology

[0002] In a plate heat exchanger, the cold and hot fluids do not directly contact each other and flow in adjacent channels separated by main plates, exchanging heat through the plates. The main plates are decorated with protrusions, and the troughs and crests of adjacent plates contact each other to form a mesh of contacts. As the cold or hot fluid flows through the channels, it is constantly disturbed by these mesh contacts, causing changes in its flow velocity and direction, creating turbulence, which is beneficial for efficient heat exchange between the cold and hot fluids.

[0003] For motherboard chips with bumps, the bumps can have various shapes. For example, the shape of the bump projected onto the plane of the motherboard chip can be crescent-shaped, polygonal, circular, or elliptical. Furthermore, the bumps mentioned in existing patents are symmetrically distributed and are generally spherical. The structure of spherical bumps is relatively simple, significantly reducing the processing difficulty of the motherboard chip. However, when fluid (including hot and cold fluids) flows past the bumps, it gradually detaches from the wall, creating an effect similar to flow around a cylinder. Additionally, a low-pressure zone is formed behind the bump, significantly increasing the flow resistance. Summary of the Invention

[0004] Therefore, it is necessary to provide a plate heat exchanger to solve the problem that existing spherical protrusions easily lead to the formation of a low-pressure zone behind the protrusion, which in turn significantly increases the fluid flow resistance.

[0005] The plate heat exchanger provided in this application includes multiple integrally formed heat exchange plates. These plates are stacked to form staggered cold flow channels and hot flow channels, allowing heat exchange between the fluids in the cold and hot flow channels. The heat exchange plates are divided into multiple partitioned units. The orthographic projection of a single partitioned unit in the horizontal plane is rectangular, with a length of x0 and a width of y0. A three-dimensional coordinate system is established around each partitioned unit, with one long side coinciding with the x-axis and one wide side coinciding with the y-axis. The functional relationship of the partitioned unit in the three-dimensional coordinate system is as follows: This is to create multiple matrix-arranged protrusions within a partition unit, with recesses between adjacent protrusions. Here, x is the length coordinate of the partition unit along the x-axis, y is the width coordinate of the partition unit along the y-axis, and z is the height coordinate of the partition unit perpendicular to the horizontal plane, where 0 ≤ x ≤ x0, 0 ≤ y ≤ y0, 1 ≤ a ≤ 5, and 1 ≤ b ≤ 5. Furthermore, the fluid flows along the x-axis in both the cold flow channel and the hot flow channel.

[0006] In one embodiment, the heat exchange plate is a stamped structure, and multiple partition units are smoothly connected to form a whole heat exchange plate.

[0007] In one embodiment, the upper end of the protrusion is provided with a first plane, which is parallel to the horizontal plane.

[0008] In one embodiment, the vertical height m of the initial vertex of the protrusion from the horizontal plane and the vertical height n of the first plane from the horizontal plane satisfy 0.5≤n / m≤0.95.

[0009] In one embodiment, the lower end of the recess is provided with a second plane, which is parallel to the horizontal plane.

[0010] In one embodiment, the vertical height e of the initial low point of the recess from the horizontal plane and the vertical height f of the second plane from the horizontal plane satisfy 0.5≤f / e≤0.95.

[0011] In one embodiment,

[0012] In one embodiment,

[0013] In one embodiment, x0 = y0.

[0014] In one embodiment, two partition units with adjacent heat exchange plates arranged opposite each other are rotationally symmetrical about the z-axis by 180 degrees.

[0015] Compared with existing technologies, the plate heat exchanger provided in this application, due to the periodicity of trigonometric functions, indicates that the three-dimensional image of the partitioned unit obtained by the above formula is necessarily periodic. Furthermore, by establishing a three-dimensional coordinate image using a computer, it is found that a single protrusion has an approximately oblique ellipse shape along its cross-section parallel to the horizontal plane, and a single depression also has an approximately oblique ellipse shape along its cross-section parallel to the horizontal plane. Moreover, the angle between the major axis and the x-axis of the oblique ellipse is...

[0016] Specifically, by simple calculation, when x = 0 and y = 0, When x = x0 / 2 and y = y0 / 2 When x = x0 and y = y0 When x = 0 and y = y o hour, When x = x0 and y = 0 When x = x0 / 2 and y = 0 When x = 0 and y = y0 / 2 When x = x0 / 2 and y = y0 When x = x0 and y = y0 / 2 It is known that the coordinates of the apex of each protrusion and the low point of each depression within a single partition unit are, As can be seen from the above data, a single partition unit includes a total of 5 protrusions and 4 recesses, and the recesses are located between adjacent protrusions.

[0017] Correspondingly, computer simulation analysis shows that when fluid impacts the protrusion, the area of ​​the low-pressure zone formed behind the protrusion is significantly smaller than the area of ​​the low-pressure zone formed behind the spherical protrusion, thus effectively reducing the flow resistance when the fluid passes through the protrusion.

[0018] Furthermore, based on theoretical analysis, it can be seen that since the fluid flows along the x-axis in both the cold and hot flow channels, that is, the flow direction of the fluid forms an angle with the major axis of the oblique ellipse, the angle is _____. At this point, the fluid is divided into two streams by the protrusion. The first stream flows along the side wall of the protrusion, while the second stream first separates from the side wall of the protrusion due to inertia. Then, under the pressure of the fluid on the adjacent side, it moves toward the first stream and quickly merges with it, thereby greatly reducing the area of ​​the low-pressure zone formed behind the protrusion.

[0019] Furthermore, since the horizontal cross-section of the protrusion is obliquely elliptical, and the angle between the major axis and the x-axis of the oblique ellipse is... Therefore, the protrusions and recesses are asymmetrically arranged with respect to the flow direction of the fluid. Compared with a symmetrical arrangement, this is beneficial to enhance the disturbance effect of the protrusions on the fluid, thereby enhancing the heat exchange effect of the fluid. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of a heat exchange plate according to an embodiment of this application;

[0022] Figure 2 A partial structural schematic diagram of a heat exchange plate according to an embodiment provided in this application;

[0023] Figure 3A side view of a partition unit provided in an embodiment of this application.

[0024] Reference numerals: 100, heat exchange plate; 110, cold flow channel; 120, hot flow channel; 200, partition unit; 210, protrusion; 211, first plane; 220, recess; 221, second plane. Detailed Implementation

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] In a plate heat exchanger, the cold and hot fluids do not directly contact each other and flow in adjacent channels separated by main plates, exchanging heat through the plates. The main plates are decorated with protrusions, and the troughs and crests of adjacent plates contact each other to form a mesh of contacts. As the cold or hot fluid flows through the channels, it is constantly disturbed by these mesh contacts, causing changes in its flow velocity and direction, creating turbulence, which is beneficial for efficient heat exchange between the cold and hot fluids.

[0032] For motherboard chips with bumps, the bumps can have various shapes. For example, the shape of the bump projected onto the plane of the motherboard chip can be crescent-shaped, polygonal, circular, or elliptical. Furthermore, the bumps mentioned in existing patents are symmetrically distributed and are generally spherical. The structure of spherical bumps is relatively simple, significantly reducing the processing difficulty of the motherboard chip. However, when fluid (including hot and cold fluids) flows past the bumps, it gradually detaches from the wall, creating an effect similar to flow around a cylinder. Additionally, a low-pressure zone is formed behind the bump, significantly increasing the flow resistance.

[0033] Please see Figures 1-3 To address the problem that existing spherical protrusions easily lead to the formation of a low-pressure zone behind the protrusion, thus significantly increasing fluid flow resistance, this application provides a plate heat exchanger. This plate heat exchanger includes multiple integrally formed heat exchange plates 100, which are stacked to form staggered cold flow channels 110 and hot flow channels 120, allowing heat exchange between the fluid in the cold flow channels 110 and the fluid in the hot flow channels 120 through the heat exchange plates 100.

[0034] The heat exchange plate 100 is divided into multiple partition units 200. The orthographic projection of a single partition unit 200 in the horizontal plane is a rectangle, and the length of the projection of a single partition unit 200 in the horizontal plane is x0, and the width of the projection of a single partition unit 200 in the horizontal plane is y0.

[0035] A three-dimensional coordinate system is established using a single partition unit 200, with the origin defined as point O. One long side of partition unit 200 coincides with the x-axis, and one wide side of partition unit 200 coincides with the y-axis. The functional relationship of partition unit 200 in the three-dimensional coordinate system is as follows: The partition unit 200 is configured with a plurality of matrix-arranged protrusions 210, and recesses 220 are formed between adjacent protrusions 210. Here, x is the length coordinate of the partition unit 200 along the x-axis, y is the width coordinate of the partition unit 200 along the y-axis, and z is the height coordinate of the partition unit 200 perpendicular to the horizontal plane, where 0 ≤ x ≤ x0, 0 ≤ y ≤ y0, 1 ≤ a ≤ 5, and 1 ≤ b ≤ 5. Furthermore, the fluid flows along the x-axis in both the cold flow channel 110 and the hot flow channel 120.

[0036] It should be noted that in the statement that "the fluid flows along the x-axis in both the cold flow channel 110 and the hot flow channel 120", the direction of fluid flow refers to the overall direction of fluid movement in the cold flow channel 110 and the hot flow channel 120, excluding the direction of the branch flow after the fluid is diverted by the protrusion 210.

[0037] Due to the periodicity of trigonometric functions, it is known that the three-dimensional image of partition unit 200 obtained by the above formula must be periodic. Furthermore, by establishing a three-dimensional coordinate image using a computer, it is found that the individual protrusion 210 has an approximately oblique ellipse shape along its cross-section parallel to the horizontal plane, and the individual depression 220 also has an approximately oblique ellipse shape along its cross-section parallel to the horizontal plane. The angle between the major axis and the x-axis of the oblique ellipse is...

[0038] Specifically, by simple calculation, when x = 0 and y = 0, When x = x0 / 2 and y = y0 / 2 When x = x0 and y = y0 When x = 0 and y = y0 When x = x0 and y = 0 When x = x0 / 2 and y = 0 When x = 0 and y = y0 / 2 When x = x0 / 2 and y = y0 When x = x0 and y = y0 / 2 It is known that the coordinates of the apex of each protrusion 210 and the low point of each depression 220 within a single partition unit 200 are, As can be seen from the above data, a single partition unit 200 includes a total of 5 protrusions 210 and 4 recesses 220, and the recesses 220 are located between adjacent protrusions 210.

[0039] Correspondingly, computer simulation analysis shows that when fluid impacts the protrusion 210, the area of ​​the low-pressure zone formed behind the protrusion 210 is significantly smaller than the area of ​​the low-pressure zone formed behind the spherical protrusion, thereby effectively reducing the flow resistance of the fluid when passing through the protrusion 210.

[0040] Furthermore, based on theoretical analysis, it can be seen that since the fluid flows along the x-axis in both the cold flow channel 110 and the hot flow channel 120, that is, the flow direction of the fluid is set at an angle to the major axis of the oblique ellipse, and the angle is . At this time, the fluid is divided into two paths by the protrusion 210. The first path of fluid flows along the side wall of the protrusion 210. The second path of fluid first separates from the side wall of the protrusion 210 under the action of inertia, and then moves towards the first path of fluid under the compression of the adjacent side fluid and quickly merges with the first path of fluid, thereby greatly reducing the area of ​​the low-pressure zone formed behind the protrusion 210.

[0041] Furthermore, since the horizontal cross-section of the protrusion 210 is obliquely elliptical, and the angle between the major axis and the x-axis of the oblique ellipse is... Therefore, the protrusion 210 and the recess 220 are asymmetrically arranged with respect to the flow direction of the fluid. Compared with a symmetrical arrangement, this is beneficial to enhance the disturbance effect of the protrusion 210 on the fluid, thereby enhancing the heat exchange effect of the fluid.

[0042] In one embodiment,

[0043] In this way, the flow resistance and turbulence effect on the fluid can be optimized to achieve an optimal balance.

[0044] Furthermore, in one embodiment,

[0045] At this point, z = a·sin(x / x0·2π)·cos(y / y0·2πr+π / 2)+b·cos(x / x0·2π)·sin(y / y0·2π+π / 2). The coordinates of the apex of each protrusion 210 and the low point of each depression 220 within a single partition unit 200 are (0, 0, b), (x0 / 2, y0 / 2, b), (x0, y0, b), (0, y0, b), (x0, 0, b), (x0 / 2, 0, -b), (0, y0 / 2, -b), (x0 / 2, y0, -b), (x0, y0 / 2, -b). At this point, the drop between the highest point of the protrusion 210 and the lowest point of the depression 220 reaches a maximum of 2b. Thus, the turbulence effect of the protrusion 210 and the depression 220 on the fluid reaches its optimal value.

[0046] However, this is not the only embodiment; in other embodiments... Other values ​​are also possible, which will not be listed here.

[0047] Preferably, in one embodiment, a = 3 and b = 3.

[0048] At this point, simulation analysis shows that, compared to the spherical bump, the pressure drop of the fluid in the cold flow channel 110 and the hot flow channel 120 is reduced by 20%, and the heat exchange of the fluid between adjacent cold flow channels 110 and hot flow channels 120 is increased by 2%.

[0049] In one embodiment, x0 = y0.

[0050] At this point, the angle between the direction of fluid flow and the major axis of the oblique ellipse is arctan1, where arctan1 = 45 degrees. This minimizes the area of ​​the low-pressure zone formed behind the protrusion 210, thus minimizing the flow resistance of the fluid.

[0051] In one embodiment, the heat exchange plate 100 is a stamped structure, and multiple partition units 200 are smoothly connected to form a whole heat exchange plate 100.

[0052] This reduces the processing difficulty of the heat exchange plate 100, thereby reducing the manufacturing cost of the plate heat exchanger. Furthermore, this design helps to improve the structural strength of the heat exchange plate 100 and reduce the flow resistance of the fluid.

[0053] However, this is not the only embodiment; in other embodiments, the heat exchange plate 100 may also be a 3D printed structure.

[0054] In one embodiment, such as Figure 2 and Figure 3 As shown, the upper end of the protrusion 210 is provided with a first plane 211, which is parallel to the horizontal plane.

[0055] This helps to increase the welding area between adjacent heat exchange plates 100, thereby increasing the welding strength between adjacent heat exchange plates 100.

[0056] Specifically, the first plane 211 can be the initial plane of the heat exchange plate 100, a cutting and forming surface, or a stamping and forming surface.

[0057] Furthermore, in one embodiment, the vertical height m of the initial vertex of the protrusion 210 from the horizontal plane and the vertical height n of the first plane 211 from the horizontal plane satisfy 0.5≤n / m≤0.95.

[0058] It should be noted that the initial vertex of the protrusion 210 is the vertex before the first plane 211 was set.

[0059] Preferably, n / m = 0.85, so that the height of the cut-off protrusion 210 is 0.15 of the initial height.

[0060] In one embodiment, such as Figure 2 and Figure 3 As shown, the lower end of the recess 220 is provided with a second plane 221, which is parallel to the horizontal plane.

[0061] In this way, the first plane 211 and the second plane 221 of the adjacent heat exchange plates 100 can be welded to each other, which helps to increase the welding area between the adjacent heat exchange plates 100 and thus improve the welding strength between the adjacent heat exchange plates 100.

[0062] Specifically, the second plane 221 can be the initial plane of the heat exchange plate 100, a cutting and forming surface, or a stamping and forming surface.

[0063] Furthermore, in one embodiment, the vertical height e of the initial low point of the recess 220 from the horizontal plane and the vertical height f of the second plane 221 from the horizontal plane satisfy 0.5≤f / e≤0.95.

[0064] It should be noted that the initial low point of the recess 220 is the low point before the second plane 221 is set.

[0065] Preferably, f / e = 0.85, so that the height of the cut-off recess 220 is 0.15 of the initial height.

[0066] In one embodiment, two partition units 200 of adjacent heat exchange plates 100 are arranged opposite each other and are rotationally symmetrical about the z-axis by 180 degrees.

[0067] This avoids the connection between the protrusions 210 and the recesses 220 between adjacent heat exchange plates 100, which would affect the flow of fluid into and out of the hot flow channel 120 and the cold flow channel 110.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A plate heat exchanger, characterized in that The heat exchange plate (100) is divided into a plurality of partition units (200), the orthographic projection of a single partition unit (200) in a horizontal plane is a rectangle, the length of the orthographic projection of a single partition unit (200) in a horizontal plane is x0, and the width of the orthographic projection of a single partition unit (200) in a horizontal plane is y0. The heat exchange plate (100) is a punch forming structure, and a plurality of partition units (200) are smoothly connected to form an integral heat exchange plate (100). A three-dimensional coordinate system is established with a single partition unit (200), and one long side of the partition unit (200) coincides with the x-axis, one wide side of the partition unit (200) coincides with the y-axis, and the function relationship of the partition unit (200) in the three-dimensional coordinate system is: A plurality of matrix-arranged protruding portions (210) are formed in the partition unit (200), and a recessed portion (220) is formed between adjacent protruding portions (210), wherein x is the length coordinate of the partition unit (200) along the x-axis, y is the width coordinate of the partition unit (200) along the y-axis, z is the height coordinate of the partition unit (200) perpendicular to the horizontal plane, 0≤x≤x0, 0≤y≤y0, 1≤a≤5, 1≤b≤5, And the fluid flows along the x-axis direction in the cold flow channel (110) and the hot flow channel (120).

2. The plate heat exchanger according to claim 1, characterized in that The upper end of the convex part (210) is provided with a first plane (211) parallel to the horizontal plane.

3. The plate heat exchanger according to claim 1, characterized in that The initial vertex of the convex part (210) is vertically distant from the horizontal plane by a height m, the first plane (211) is vertically distant from the horizontal plane by a height n, and 0.5≤n / m≤0.95 is satisfied.

4. The plate heat exchanger according to claim 3, characterized in that The lower end of the concave part (220) is provided with a second plane (221) parallel to the horizontal plane.

5. The plate heat exchanger according to claim 1, characterized in that The initial low point of the concave part (220) is vertically distant from the horizontal plane by a height e, the second plane (221) is vertically distant from the horizontal plane by a height f, and 0.5≤f / e≤0.95 is satisfied.

6. The plate heat exchanger according to claim 5, characterized in that x0=y0.

7. The plate heat exchanger according to claim 1, characterized in that 8. The plate heat exchanger according to claim 1, characterized in that 9. The plate heat exchanger according to claim 1, characterized in that Two partition units (200) of the heat exchange plate (100) oppositely arranged adjacent to each other are 180-degree rotationally symmetrical about the z-axis.

10. The plate heat exchanger according to claim 1, characterized in that ​

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