Plate sheet and heat exchanger

Abstract

The utility model provides a sheet bar, along the length direction of the sheet bar, the two ends of the sheet bar are flow guide areas, the middle part of the sheet bar is a main heat exchange area, the flow guide areas are provided with medium inlets and outlets and flow guide ribs enabling media to be uniformly distributed in the width direction of the sheet bar, and the main heat exchange area is provided with a plurality of heat exchange units. The heat exchange units are arranged in an array mode in the length direction and the width direction of the sheet bar, each heat exchange unit is provided with a plurality of protruding tops and a plurality of concave bottoms, the tops and the bottoms are connected through side faces, the tops and the bottoms are welding parts used for being welded to adjacent sheet bars, and the welding parts are welded to the adjacent sheet bars. Every two adjacent bottoms are connected through a slope-shaped connecting part, a horizontally-arranged middle plane is arranged on each slope-shaped connecting part, and the middle planes are connected with the side faces of the heat exchange units through transition curved surfaces. The utility model further provides a heat exchanger which comprises a heat exchange core body, the heat exchange core body comprises a plurality of plates, and the plates are sequentially welded in the set direction.

Description

Technical Field

[0001] The utility model relates to the field of plate heat exchangers, and particularly to a plate and a heat exchanger. Background Art

[0002] In recent years, in the field of plate heat exchangers, a new type of dot corrugated structure plate has emerged. Compared with the conventional herringbone corrugated plate, the dot corrugated plate heat exchanger has the characteristics of lower resistance, thinner plates, and more compact structure, so it has significant competitiveness in the market.

[0003] In actual product applications, for plates with a small aspect ratio of length to width, when applying the dot corrugated structure, its heat transfer performance is not ideal. The main reason is that after the distance in the width direction of the plate increases, it will affect the flow uniformity of the medium inside the plate, thereby affecting the heat transfer performance of the plate heat exchanger. For herringbone corrugations, due to the guiding effect of the ribs, the influence caused by the decrease in the aspect ratio of the plate is relatively small; while the flow uniformity inside the dot corrugated plate is closely related to the aspect ratio of the plate. In existing products or existing patents, there is no technical means for improving the flow uniformity of the dot corrugated plate. Therefore, it is necessary to design a new plate and heat exchanger to overcome this problem. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects of the prior art, and provides a plate and a heat exchanger. The utility model solves at least some problems in the prior art.

[0005] The utility model is implemented as follows:

[0006] The utility model provides a plate. Along the length direction of the plate, both ends of the plate are flow guiding areas, the middle part of the plate is the main heat exchange area. The flow guiding areas are provided with medium inlets and outlets and flow guiding ribs for evenly distributing the medium in the width direction of the plate. The main heat exchange area is provided with a plurality of heat exchange units. Each heat exchange unit is arranged in an array in the length direction and width direction of the plate. The heat exchange unit is provided with a plurality of protruding tops and a plurality of concave bottoms. The tops and bottoms are connected by sides. Both the tops and the bottoms are welding parts for welding with adjacent plates. The adjacent bottoms are connected by a slope connecting part. The slope connecting part is provided with a horizontally arranged middle plane. The middle plane and the side surface of the heat exchange unit are connected by a transition surface.

[0007] Further, there are three tops on the heat exchange unit, and the three tops are distributed in an obtuse triangle.

[0008] Further, there are five bottoms on the heat exchange unit. One bottom is located at the center of the heat exchange unit, and four bottoms are located at the four end corners of the heat exchange unit. The bottom at the center of the heat exchange unit is located between the three tops.

[0009] Furthermore, the distance from the middle plane to the bottom is h, and the distance from the top to the bottom is H, where h = 0.4 - 0.6H.

[0010] Furthermore, the top is in a strip shape.

[0011] Furthermore, the bottom is in a water-drop shape.

[0012] Furthermore, the side surface is a smooth curved surface.

[0013] The present utility model also provides a heat exchanger, which includes a heat exchange core body. The heat exchange core body includes a plurality of the above-mentioned plate sheets, and each of the plate sheets is welded in sequence along a set direction.

[0014] The present utility model has the following beneficial effects:

[0015] 1. The present utility model adopts a combined design of herringbone corrugations and dot corrugations: a herringbone corrugation structure in the shape of rib strips is adopted near the medium inlet and outlet to form a diversion area, which is conducive to the uniform distribution of the refrigerant or other media along the width direction of the plate heat exchanger after entering the plate heat exchanger from the medium inlet and outlet, thereby improving the heat exchange performance of the dot corrugated plate sheets and the dot corrugated plate heat exchanger.

[0016] 2. After the medium flows into the plate sheet through the medium inlet and outlet, under the guiding action of the guiding rib strips in the diversion area, the medium is more evenly distributed in the width direction of the plate sheet. Compared with the traditional dot corrugated plate sheets, the uniformity of the medium flow is improved.

[0017] 3. The present utility model specially designs the heat exchange units in the main heat exchange area. The main heat exchange area is formed by the periodic array arrangement of a plurality of small heat exchange units along the length direction and the width direction of the plate sheet. The middle plane is designed for the heat exchange units to ensure that the fluid flow cross-section is large enough to ensure good fluid flowability.

[0018] 4. When the medium fluid flows from one bottom to the adjacent bottom through the slope connecting part, due to the horizontal middle plane provided in the slope connecting part, the middle plane makes the medium fluid flow more evenly in the width direction of the plate sheet, thereby improving the heat exchange performance of the dot corrugated plate sheets and the dot corrugated plate heat exchanger. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Schematic diagram of the overall structure of the plate provided by the embodiment of the present utility model;

[0021] Figure 2 Provided by the embodiment of the present utility model Figure 1 Enlarged view of the upper left corner;

[0022] Figure 3 Provided by the embodiment of the present utility model Figure 2 Enlarged view of the heat exchange unit in the middle.

[0023] In the figure: plate 1, medium inlet and outlet 2, diversion area 3, main heat exchange area 4, diversion rib 5, heat exchange unit 6, top 7, bottom 8, side 9, slope-shaped connection part 10, middle plane 11, transition surface 12. Specific implementation manners

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "several" is two or more.

[0026] Such as Figures 1 - 3, Embodiment 1 of the present utility model provides a plate 1. Along the length direction of the plate 1, both ends of the plate 1 are flow guiding areas 3, and the middle part of the plate 1 is the main heat exchange area 4. The flow guiding area 3 is provided with a medium inlet and outlet 2 and flow guiding rib strips 5 for making the medium evenly distributed in the width direction of the plate. After the medium flows into the plate 1 through the medium inlet and outlet 2, under the guiding action of the flow guiding rib strips 5 in the flow guiding area 3, the medium is more evenly distributed in the width direction of the plate 1. Compared with the traditional dot-shaped corrugated plate, the uniformity of the medium flow is improved, thereby improving the heat exchange performance of the dot-shaped corrugated plate and the dot-shaped corrugated plate heat exchanger; the main heat exchange area 4 is provided with a number of heat exchange units 6, and each of the heat exchange units 6 is arranged in an array in the length direction and width direction of the plate 1. The heat exchange unit 6 is provided with a number of protruding tops 7 and a number of sunken bottoms 8. The tops 7 and the bottoms 8 are connected by a side 9. The top 7 is the highest point of the heat exchange unit, and the bottom 8 is the lowest point of the heat exchange unit. Both the top 7 and the bottom 8 are welding parts for welding with adjacent plates. The adjacent two bottoms 8 are connected by a slope-shaped connecting part 10. The slope-shaped connecting part 10 is provided with a horizontally arranged middle plane 11, and the middle plane 11 is connected to the side 9 of the heat exchange unit by a transition surface 12. When the medium fluid flows from one bottom 8 to the adjacent bottom 8 through the slope-shaped connecting part 10, due to the horizontally arranged middle plane 10 on the slope-shaped connecting part 10, the middle plane 10 makes the medium fluid flow more evenly in the width direction of the plate, thereby improving the heat exchange performance of the dot-shaped corrugated plate and the dot-shaped corrugated plate heat exchanger.

[0027] In this embodiment, there are three tops 7 on the heat exchange unit, and the three tops 7 are distributed in an obtuse triangle. There are five bottoms 8 on the heat exchange unit. One bottom 8 is located at the center of the heat exchange unit, and four of the bottoms 8 are located at the four end corners of the heat exchange unit. The bottom at the center of the heat exchange unit is located between the three tops.

[0028] In this embodiment, there are three tops 10 on the heat exchange unit 6. Two of the tops are not completely shown on one heat exchange unit and can form a complete long strip-shaped top with the corresponding tops on the adjacent heat exchange units; there are five bottoms 8 on the heat exchange unit 6. The bottoms 8 located at the four corners are not completely shown and can form a complete water droplet-shaped bottom with the corresponding bottoms on the adjacent heat exchange units. On the heat exchange unit 6, a part of the bottoms 8 is located on the first diagonal of the heat exchange unit 6, and another part of the bottoms 8 is located on the second diagonal of the heat exchange unit 6. Both the first diagonal and the second diagonal pass through three bottoms 8. The first diagonal and the second diagonal are in a cross relationship, and both the first diagonal and the second diagonal pass through the bottom 8 located at the center of the heat exchange unit.

[0029] In this embodiment, the side surface 9 is a smooth curved surface, and the side surface 12 is smooth without dead corners, reducing the pressure loss of the medium fluid. Preferably, the radian of the side surface 12 can conform to the trigonometric function curve, with smoother flow and reduced flow resistance.

[0030] Embodiment II of the present utility model provides a heat exchanger, including a heat exchange core body, and the heat exchange core body includes a plurality of the above-mentioned plate pieces 1, and each of the plate pieces 1 is welded in sequence along a set direction.

[0031] When assembling the plate pieces provided in this embodiment into a heat exchange core body, a plurality of plate pieces 1 are stacked along a set direction (the height direction of the heat exchange core body), and the plurality of plate pieces are welded in sequence. A layer of medium channels is formed between two adjacent plate pieces; in this embodiment, the plate pieces 1 are stacked and welded in a positive and negative sequence, that is, the top 7 of a certain plate piece is placed upwards, and the top 7 of the adjacent plate piece above it is placed downwards, and the tops of the two plate pieces are welded together to form a first medium channel layer; if the bottom 8 of a certain plate piece is placed upwards, the bottom 8 of the adjacent plate piece above it is placed downwards, and the bottoms of the two plate pieces are welded together to form a second medium channel layer.

[0032] The purpose of the present utility model is to address the problem of poor fluid distribution uniformity in dot corrugated plate pieces (especially plate pieces with a small aspect ratio of length to width). The fluid flow inside the plate pieces is mainly optimized through two technical means, thereby improving the heat exchange performance of the dot corrugated plate heat exchanger.

[0033] One is the combined design of herringbone corrugation and dot corrugation: near the medium inlet and outlet 2, a rib-shaped herringbone corrugation structure is adopted to form a diversion area, which is conducive to the uniform distribution of refrigerant or other media along the width direction of the plate heat exchanger after entering the plate heat exchanger from the medium inlet and outlet.

[0034] The second is the special design of the heat exchange units in the main heat exchange area: the main heat exchange area is formed by the periodic array of a plurality of small heat exchange units 6 along the length direction and width direction of the plate piece. The overall structure of the heat exchange unit is as Figure 3 shown, including a top 7, a bottom 8, a middle plane 11, a side surface 9, and a transition curved surface 12. The top 7 is long strip-shaped, the bottom 8 is similar to a water droplet shape, the top 7 and the bottom 8 are respectively the welding surfaces between this plate piece and the adjacent upper plate piece and the adjacent lower plate piece, and the area ratio of the top 7 to the bottom 8 ranges from 1.5:1 to 1:1.5. The height h of the middle plane 11 from the bottom 8 is 0.4 - 0.6H (H is the total corrugation height, that is, the distance between the top and the bottom). The main purpose of setting the middle plane 11 is to ensure that the fluid flow cross-section in this area is large enough to ensure good fluid flow. The middle plane 11 is connected to the side surface 9 of the heat exchange unit by a transition curved surface 12.

[0035] The plate piece 1 is divided into three areas: the inlet and outlet area of the cold fluid and the hot fluid, the diversion area 3, and the main heat exchange area 4.

[0036] The import and export area is provided with 4 medium inlets and outlets 2. The 4 medium inlets and outlets 2 are respectively a cold fluid inlet, a cold fluid outlet, a hot fluid inlet, and a hot fluid outlet. The cold fluid inlet and outlet can be arranged diagonally or close to the same long side of the plate. The same applies to the hot fluid inlets and outlets.

[0037] Herringbone corrugated flow guide area 3: Figure 2 The shown corrugation angle α is associated with the aspect ratio of the length and width of the plate, and the value range is 0 to 90°. In this embodiment, the value of α is 45°.

[0038] Main heat exchange area 4: In this embodiment, the area ratio of the top 7 to the bottom 8 is 1.5:1. The height h of the mid-plane 11 from the bottom 8 is 0.5H (H is the total corrugation height), and the area ratio of the mid-plane 11 to the bottom 8 is 1:4.

[0039] The simulation results of the present utility model show that the heat exchange performance is improved by 10% compared with the traditional dot-shaped corrugated plate.

[0040] The present utility model optimizes the flow uniformity in the import and export area: by combining the herringbone corrugation and the dot-shaped corrugation design, the flow of the medium in the width direction after entering the plate 1 is optimized, and the flow uniformity of the medium in the width direction of the plate is enhanced.

[0041] The present utility model optimizes the flow uniformity in the main heat exchange area, and the heat exchange performance is improved by 10%: the heat exchange unit 6 in the main heat exchange area 4 is designed with a mid-plane 11 to ensure that the fluid flow cross-section is large enough to ensure good fluidity.

[0042] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0043] The above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A plate, characterized in that: Along the length direction of the plate, both ends of the plate are diversion zones, and the middle part of the plate is the main heat exchange zone. The diversion zones are provided with medium inlets and outlets and diversion rib strips for making the medium evenly distributed in the width direction of the plate. The main heat exchange zone is provided with a plurality of heat exchange units, and the heat exchange units are arranged in an array in the length direction and the width direction of the plate. Each heat exchange unit is provided with a plurality of protruding tops and a plurality of sunken bottoms. The tops and the bottoms are connected by sides. Both the tops and the bottoms are welding parts for welding with adjacent plates. The adjacent two bottoms are connected by a slope connecting part. The slope connecting part is provided with a horizontally arranged middle plane, and the middle plane is connected with the side of the heat exchange unit by a transition curved surface.

2. The sheet according to claim 1, characterized in that: There are three tops on the heat exchange unit, and the three tops are distributed in an obtuse triangle.

3. The sheet according to claim 2, wherein: There are five bottoms on the heat exchange unit. One bottom is located at the center of the heat exchange unit, and four bottoms are located at the four end corners of the heat exchange unit. The bottom at the center of the heat exchange unit is located between the three tops.

4. The sheet according to claim 1, characterized in that: The distance from the middle plane to the bottom is h, and the distance from the top to the bottom is H, and h = 0.4 - 0.6H.

5. The sheet according to claim 1, characterized in that: The top is strip-shaped.

6. The sheet according to claim 1, characterized in that: The bottom is drop-shaped.

7. The sheet according to claim 1, wherein: The side is a smooth curved surface.

8. A heat exchanger, characterized in that: It includes a heat exchange core body, and the heat exchange core body includes a plurality of plates as described in any one of claims 1-7, and the plates are welded in sequence along a set direction.

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