Plate sheet and heat exchanger

Abstract

The utility model discloses a plate sheet and a heat exchanger, relates to the technical field of heat exchange devices, and is used for enhancing fluid streaming, enhancing heat exchange and improving heat exchange performance. The top surface of the plate sheet is provided with a plurality of concave parts and a plurality of convex parts, the plurality of concave parts form a plurality of rows and columns of concave part groups, the concave parts included in two adjacent rows of concave part groups are arranged in a staggered manner, and the concave parts included in two adjacent columns of concave part groups are arranged in a staggered manner; the plurality of convex parts form a plurality of rows and columns of convex part groups, the convex parts included in two adjacent rows of convex part groups are arranged in a staggered manner, and the convex parts included in two adjacent columns of convex part groups are arranged in a staggered manner; in each row of concave part groups, a convex part is arranged between every two adjacent concave parts, and in each row of convex part groups, a concave part is arranged between every two adjacent convex parts. The heat exchanger comprises a plurality of stacked plate sheets, every two adjacent plate sheets are symmetrically arranged and form a heat exchange cavity, and the heat exchange cavities in the two sides of each plate sheet are used for circulation of different media.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange devices, in particular to a plate and a heat exchanger. Background Art

[0002] The plate heat exchanger includes front and rear end plates and a plurality of plates located between the front and rear end plates, and a heat exchange cavity for fluid flow is formed between the plates and between the plates and the front and rear end plates. When the plate heat exchanger is in operation, the cold fluid and the hot fluid flow in the heat exchange cavity on both sides of the plate, so that the cold fluid and the hot fluid exchange heat through the plate.

[0003] The plate is provided with a plurality of raised portions protruding toward one side of the plate and a plurality of recessed portions recessed toward a side away from the raised portions. The raised portions and recessed portions on the plate are staggered so that when the cold fluid or the hot fluid flows in the heat exchange cavity, it is constantly disturbed by the raised portions and recessed portions, which is beneficial to the sufficient heat exchange of the cold fluid and the hot fluid.

[0004] However, in the prior art, the protrusions and recesses are generally arranged in an array, the flow channels are distributed relatively evenly, the fluid flows relatively regularly, and the heat exchange effect is poor. Utility Model Content

[0005] The utility model aims to provide a plate and a heat exchanger, which are used to enhance fluid flow, strengthen heat exchange, and improve heat exchange performance.

[0006] In order to achieve the above-mentioned purpose, in a first aspect, the utility model provides a plate having a top surface and a bottom surface arranged relatively to each other, the top surface of the plate having a plurality of recessed portions and a plurality of raised portions, the plurality of recessed portions forming a plurality of rows and columns of recessed portion groups, wherein the recessed portions included in two adjacent rows of recessed portion groups are staggered, and the recessed portions included in two adjacent columns of recessed portion groups are staggered; the plurality of raised portions forming a plurality of rows and columns of raised portion groups, wherein the raised portions included in two adjacent rows of raised portion groups are staggered, and the raised portions included in two adjacent columns of raised portion groups are staggered; and, in each row of recessed portion groups, a raised portion is arranged between two adjacent recessed portions, and in each row of raised portion groups, a recessed portion is arranged between two adjacent raised portions.

[0007] When the above technical solution is adopted, the top surface of the plate has multiple rows and columns of recessed parts and multiple rows and columns of raised parts, so that when the fluid flows in the heat exchange cavity on both sides of the plate, it is constantly disturbed by the raised parts and recessed parts, and the flow velocity and flow direction are constantly changing, which is conducive to the fluid on both sides of the plate to fully exchange heat through the plate. Not only that, the recessed parts included in the two adjacent rows of recessed part groups are staggered, and the raised parts included in the two adjacent rows of raised part groups are staggered. In addition, in each row of recessed part groups, a raised part is arranged between two adjacent recessed parts, and in each row of raised part groups, a recessed part is arranged between two adjacent raised parts, which indicates that the recessed parts and raised parts in the same row are arranged alternately. Furthermore, the recessed parts included in the two adjacent rows of recessed part groups are staggered, and the raised parts included in the two adjacent rows of raised part groups are staggered. In this way, the fluid flow can be strengthened, the heat exchange is enhanced, and the heat exchange performance is improved.

[0008] In a possible implementation manner, the bottom surface of the recessed portion and the top surface of the raised portion have different shapes.

[0009] In a possible implementation, the bottom edge of the recessed portion is an arc-shaped triangle, the corner of the arc-shaped triangle is an arc-shaped transition, and the side of the arc-shaped triangle is an outward convex arc.

[0010] In one possible implementation, the top surface edge of the raised portion includes a first arc segment, a second arc segment, a third arc segment, and a fourth arc segment connected in sequence end to end, and an end of the first arc segment away from the second arc segment is connected to an end of the fourth arc segment away from the third arc segment, and an arc-shaped transition is formed at the interconnected positions of the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment.

[0011] In a possible implementation manner, the first arc segment and the third arc segment are concave arcs that curve toward the geometric center of the top surface of the protrusion.

[0012] In a possible implementation, the distance d1 between two adjacent rows of recessed portion groups is equal to the distance d2 between two adjacent rows of raised portion groups.

[0013] In a possible implementation manner, the distance between two adjacent columns of recessed portion groups and raised portion groups is d3, and 0≤d3<d2 / 2.

[0014] In a possible implementation, a line connecting geometric centers of three recesses in two adjacent columns of recess groups forms a first isosceles triangle, a vertex angle α1 of the first isosceles triangle is 60°-150°, and the three recesses belong to three adjacent rows of recess groups respectively.

[0015] In a possible implementation, a line connecting geometric centers of three protrusions in two adjacent columns of protrusion groups forms a second isosceles triangle, a vertex angle α2 of the second isosceles triangle is 60°-150°, and the three protrusions belong to three adjacent rows of protrusion groups respectively.

[0016] In a possible implementation, the convex portion and the concave portion transition in an arc shape.

[0017] In a second aspect, the utility model provides a heat exchanger, comprising a plurality of stacked plates as described in the first aspect or any possible implementation of the first aspect, two adjacent plates are symmetrically arranged to form a heat exchange cavity, and the heat exchange cavities on both sides of each plate are used to circulate different media.

[0018] Compared with the prior art, the beneficial effects of the heat exchanger provided in the present application are the same as the beneficial effects of the above-mentioned plates, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 A schematic front view of a plate provided in an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of a partial structure of a plate provided in an embodiment of the utility model;

[0022] Figure 3 A schematic diagram of the positional relationship between the concave portion and the convex portion provided in an embodiment of the utility model;

[0023] Figure 4 A schematic top view of a raised portion provided in an embodiment of the utility model.

[0024] Reference numerals:

[0025] 1-recessed portion, 2-convex portion, 21-first arc segment, 22-second arc segment, 23-third arc segment,

[0026] 24-the fourth arc segment, 4-the fluid inlet, 5-the fluid outlet. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] See also Figures 1 to 3 As shown, an embodiment of the utility model provides a plate sheet, which has a top surface and a bottom surface arranged relatively to each other, and the top surface of the plate sheet has a plurality of recessed portions 1 and a plurality of raised portions 2, wherein the plurality of recessed portions 1 form a plurality of rows and columns of recessed portion groups, wherein the recessed portions 1 included in two adjacent rows of recessed portion groups are staggered, and the recessed portions 1 included in two adjacent columns of recessed portion groups are staggered; the plurality of raised portions 2 form a plurality of rows and columns of raised portion groups, wherein the raised portions 2 included in two adjacent rows of raised portion groups are staggered, and the raised portions 2 included in two adjacent columns of raised portion groups are staggered; and, in each row of recessed portion groups, a raised portion 2 is arranged between two adjacent recessed portions 1, and in each row of raised portion groups, a recessed portion 1 is arranged between two adjacent raised portions 2.

[0033] When the above technical solution is adopted, the top surface of the plate has multiple rows and columns of recessed portions 1 and multiple rows and columns of raised portions 2, so that when the fluid flows in the heat exchange cavity on both sides of the plate, it is constantly disturbed by the raised portions 2 and recessed portions 1, and the flow velocity and flow direction are constantly changing, which is conducive to the fluid on both sides of the plate to fully exchange heat through the plate. In addition, the recessed portions 1 included in the two adjacent rows of recessed portion groups are staggered, and the raised portions 2 included in the two adjacent rows of raised portion groups are staggered, and in each row of recessed portion groups, a raised portion 2 is arranged between two adjacent recessed portions 1, and in each row of raised portion groups, a recessed portion 1 is arranged between two adjacent raised portions 2, which indicates that the recessed portions 1 and raised portions 2 in the same row are arranged alternately. Furthermore, the recessed portions 1 included in two adjacent rows of recessed portion groups are staggered, and the raised portions 2 included in two adjacent rows of raised portion groups are staggered, so that the fluid flow can be enhanced, the heat exchange can be strengthened, and the heat exchange performance can be improved.

[0034] It should be noted that see Figure 1 As shown, the plate provided in the embodiment of the utility model is provided with a fluid inlet 4 and a fluid outlet 5, and the fluid can enter the heat exchange cavity formed between adjacent plates through the fluid inlet 4, and the fluid in the heat exchange cavity can flow out of the heat exchange cavity through the fluid outlet 5. The fluid inlet 4 and the fluid outlet 5 can be set at any position of the plate. Of course, in order to ensure a longer heat exchange path and facilitate the connection of pipelines, the fluid inlet 4 and the fluid outlet 5 are preferably set close to the end of the plate, and the fluid inlet 4 and the fluid outlet 5 are respectively set at both ends of the plate along the first direction, such as Figure 1 shown.

[0035] See also Figure 2 and Figure 3 As shown, the bottom surface of the concave portion 1 and the top surface of the convex portion 2 are different in shape, so that the heat exchange cavity formed on both sides of the plate is an asymmetric design. In specific implementation, the fluid flow paths on both sides of the plate are varied, which can enhance heat exchange. At the same time, the volumes on both sides of the plate are different. The heat exchange cavity on the side with a smaller volume can be used for refrigerant, and the heat exchange cavity on the side with a larger volume can be used for circulating water, increasing the water filling amount, while reducing the water resistance, enhancing heat exchange, and improving the heat exchange effect.

[0036] As an alternative, see Figure 2 and Figure 3 As shown, the bottom edge of the recessed portion 1 is an arc-shaped triangle, the corner of the arc-shaped triangle is an arc-shaped transition, and the side of the arc-shaped triangle is an outward convex arc. In other words, the bottom surface of the recessed portion 1 is a closed curved surface formed by a triangle, and the side of the triangle is an arc. This not only makes the flow of the fluid smoother, but also improves the structural strength of the plate, avoids stress concentration on the plate, and damages the plate, further shortening the service life of the plate. In specific implementation, Figure 3 As shown, the bottom surface of the recessed portion 1 may be shaped like an "egg", the arc-shaped triangle may be an isosceles arc-shaped triangle, and the base of the isosceles arc-shaped triangle may be perpendicular to the flow direction of the fluid in the heat exchange chamber.

[0037] In another alternative, see Figure 4 As shown, the top edge of the raised portion 2 includes a first arc segment 21, a second arc segment 22, a third arc segment 23 and a fourth arc segment 24 connected in sequence, and the end of the first arc segment 21 away from the second arc segment 22 is connected to the end of the fourth arc segment 24 away from the third arc segment 23, and the first arc segment 21, the second arc segment 22, the third arc segment 23 and the fourth arc segment 24 are connected at the positions where they are connected. In this way, not only can the fluid flow be strengthened, the heat exchange be enhanced, and the heat exchange performance be improved, but also the structural strength of the plate can be improved, and the plate can be prevented from being damaged by stress concentration, thereby further shortening the service life of the plate.

[0038] In a specific implementation, the first arc segment 21 and the third arc segment 23 are concave arcs that are bent toward the geometric center of the top surface of the protrusion 2, so that the fluid flow can be strengthened, the heat exchange can be enhanced, and the heat exchange performance can be improved.

[0039] It should be noted that, for the convenience of description, a plurality of recessed portions 1 are arranged in sequence along the first direction to form a row of recessed portion groups, and a plurality of recessed portions 1 are arranged in sequence along the second direction to form a column of recessed portion groups. Correspondingly, a plurality of raised portions 2 are arranged in sequence along the first direction to form a row of raised portion groups, and a plurality of raised portions 2 are arranged in sequence along the second direction to form a column of raised portion groups. The point where half of the size of the bottom surface of a recessed portion 1 in the first direction coincides with half of the size of the recessed portion 1 in the second direction is defined as the geometric center of the recessed portion 1. The point where half of the size of the top surface of a raised portion 2 in the first direction coincides with half of the size of the raised portion 2 in the second direction is defined as the geometric center of the raised portion 2.

[0040] In some embodiments, see Figure 3 As shown, the distance d1 between two adjacent rows of recessed portions is equal to the distance d2 between two adjacent rows of raised portions. Meanwhile, the distance between two adjacent rows of recessed portions and raised portions is d3, and 0≤d3<d2 / 2, so that the heat exchange performance can be improved.

[0041] In one example, referring to Figure 3, the lines connecting the geometric centers of the three recessed portions 1 in two adjacent rows of recessed portion groups form a first isosceles triangle, the vertex angle α1 of the first isosceles triangle is 60°-150°, and the three recessed portions 1 belong to three adjacent rows of recessed portion groups. Exemplarily, α1 can be 60°, 75°, 90°, 100°, 120°, 130°, 140°, 145°, 150°, etc., which is not specifically limited here and is subject to actual conditions.

[0042] In another example, referring to Figure 3 , the line connecting the geometric centers of the three protrusions 2 in two adjacent rows of protrusion groups forms a second isosceles triangle, the vertex angle α2 of the second isosceles triangle is 60°-150°, and the three protrusions 2 belong to three adjacent rows of protrusion groups respectively. In this way, the heat exchange performance can be improved. And after experiments, the heat exchange performance of the plate provided by the embodiment of the utility model is improved by 20% compared with the traditional point corrugated plate, and the water side resistance is reduced by 10% compared with the traditional point corrugated plate. Exemplarily, α2 can be 60°, 75°, 90°, 100°, 110°, 120°, 140°, 145°, 150°, etc., which is not specifically limited here and is subject to actual conditions.

[0043] In a possible implementation, the raised portion 2 and the recessed portion 1 transition in an arc shape, and in this case, the fluid can flow along the curved surface, and the overall resistance generated is small.

[0044] In addition to the above, an embodiment of the utility model further provides a heat exchanger, including a plurality of stacked plates, wherein two adjacent plates are symmetrically arranged to form a heat exchange cavity, and the heat exchange cavities on both sides of each plate are used to circulate different media.

[0045] For the convenience of description, three adjacent plates are defined as the first plate, the second plate and the third plate, respectively, wherein the second plate is located between the first plate and the third plate, the second plate is symmetrically arranged with the first plate, and the second plate is symmetrically arranged with the third plate. In addition, the first plate, the second plate and the third plate are stacked in sequence along the third direction, and the third direction is perpendicular to both the first direction and the second direction. The side of the third plate away from the first plate is defined as the top surface of the third plate, and the side of the third plate close to the first plate is defined as the bottom surface of the third plate. Similarly, the side of the second plate away from the first plate is defined as the top surface of the second plate, and the side of the second plate close to the first plate is defined as the bottom surface of the second plate. The side of the first plate close to the second plate is defined as the top surface of the first plate, and the side of the first plate away from the second plate is defined as the bottom surface of the first plate. In this case, during the specific implementation, the bottom surface of the recessed portion 1 of the second plate is welded to the top surface of the recessed portion 1 of the second plate, and the top surface of the raised portion 2 of the second plate is welded to the bottom surface of the raised portion 2 of the third plate, so that a water heat exchange chamber is formed between the second plate and the first plate, and at the same time, a condenser heat exchange chamber is formed between the second plate and the third plate, thereby realizing heat exchange between water and refrigerant.

[0046] Compared with the prior art, the beneficial effects of the heat exchanger provided in the present application are the same as the beneficial effects of the above-mentioned plates, which will not be described in detail here.

[0047] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0048] The above are only specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A plate, characterized in that: It has a top surface and a bottom surface that are relatively arranged, and the top surface of the plate has multiple recessed portions and multiple raised portions, wherein the multiple recessed portions form multiple rows and multiple columns of recessed portion groups, wherein the recessed portions included in two adjacent rows of the recessed portion groups are staggered, and the recessed portions included in two adjacent columns of the recessed portion groups are staggered; the multiple raised portions form multiple rows and multiple columns of raised portion groups, wherein the raised portions included in two adjacent rows of the raised portion groups are staggered, and the raised portions included in two adjacent columns of the raised portion groups are staggered; and, in each row of the recessed portion groups, one raised portion is arranged between two adjacent recessed portions, and in each row of the raised portion groups, one recessed portion is arranged between two adjacent raised portions.

2. The plate according to claim 1, characterized in that The bottom surface of the recessed portion and the top surface of the raised portion have different shapes.

3. The plate according to claim 2, characterized in that The bottom edge of the recessed portion is an arc-shaped triangle, the corner of the arc-shaped triangle is an arc-shaped transition, and the side of the arc-shaped triangle is an outward convex arc.

4. The plate according to claim 2, characterized in that The top surface edge of the raised portion includes a first arc segment, a second arc segment, a third arc segment and a fourth arc segment connected in sequence end to end, and an end of the first arc segment away from the second arc segment is connected to an end of the fourth arc segment away from the third arc segment, and the first arc segment, the second arc segment, the third arc segment and the fourth arc segment are connected to each other at an arc-shaped transition.

5. The plate according to claim 4, characterized in that The first arc segment and the third arc segment are concave arcs that curve toward the geometric center of the top surface of the protruding portion.

6. The plate according to claim 1, characterized in that The distance d1 between two adjacent rows of the recessed portion groups is equal to the distance d2 between two adjacent rows of the raised portion groups.

7. The plate according to claim 6, characterized in that The distance between two adjacent rows of the recessed portion groups and the raised portion groups is d3, and 0≤d3<d2 / 2.

8. The plate according to claim 1, characterized in that A line connecting geometric centers of three recessed portions in two adjacent rows of recessed portion groups forms a first isosceles triangle, a vertex angle α1 of the first isosceles triangle is 60°-150°, and the three recessed portions belong to three adjacent rows of recessed portion groups respectively; and / or, A line connecting the geometric centers of three protrusions in two adjacent columns of the protrusion groups forms a second isosceles triangle, a vertex angle α2 of the second isosceles triangle is 60°-150°, and the three protrusions belong to three adjacent rows of the protrusion groups respectively.

9. The plate according to claim 1, characterized in that The convex portion and the concave portion transition in an arc shape.

10. A heat exchanger, characterized in that: It comprises a plurality of stacked plates as claimed in any one of claims 1 to 9, wherein two adjacent plates are symmetrically arranged to form a heat exchange cavity, and the heat exchange cavities on both sides of each plate are used to circulate different media.

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