Heat exchange plates and heat exchangers

Abstract

The present invention relates to the field of heat exchangers, and discloses a heat exchange plate and a heat exchanger. The heat exchange plate includes a plate body and multiple rows of guide plates arranged on the plate body, a first fluid channel is formed between two adjacent rows of guide plates, the guide plate includes multiple airfoil blocks arranged at intervals, a second fluid channel is provided inside the airfoil block, the airfoil block has a first end and a second end opposite to each other, the first end is provided with a fluid inlet connected to the second fluid channel, and the second end is provided with a fluid outlet connected to the second fluid channel. The heat exchanger includes a shell and the above-mentioned heat exchange plate arranged inside the shell. The present invention has airfoil blocks evenly distributed on the plate body, and a second fluid channel is provided inside the airfoil block, so as to reduce the thermal resistance of the airfoil block, and this design method can increase the flow rate of the fluid around the airfoil block, thereby strengthening the heat exchange capacity at the leading edge, middle part and trailing edge of the airfoil block, thereby enhancing the heat transfer capacity of the entire heat exchange plate.

Description

Technical Field

[0001] The present invention relates to the field of heat exchangers, and in particular to a heat exchange plate and a heat exchanger. Background Art

[0002] Thermal energy is a primary form of energy in key sectors such as power generation and petrochemicals. 80% of this heat needs to be converted through heat exchangers to meet diverse process requirements. The efficiency of thermal energy utilization directly impacts the overall energy consumption of the system. Therefore, heat exchangers are key energy conversion devices in power generation systems and are crucial to the implementation of my country's energy conservation and emission reduction strategies.

[0003] Due to space and cost constraints, heat exchangers are required to be efficient, compact, and low-resistance. To achieve these goals, a common approach is to machine tiny channels into heat exchange plates, stack them to form a heat exchange core, and then weld the ends together to create the heat exchanger. However, this type of heat exchange plate suffers from high thermal resistance and poor heat transfer. Summary of the Invention

[0004] In order to solve the above technical problem or at least partially solve the above technical problem, the present invention provides a heat exchange plate and a heat exchanger.

[0005] The present invention provides a heat exchange plate, which includes a plate body and multiple rows of guide plates arranged on the plate body, a first fluid channel is formed between two adjacent rows of guide plates, the guide plate includes multiple airfoil blocks arranged at intervals, a second fluid channel is provided inside the airfoil blocks, the airfoil blocks have opposite first and second ends, the first end of the airfoil block is provided with a fluid inlet connected to the second fluid channel, and the second end of the airfoil block is provided with a fluid outlet connected to the second fluid channel.

[0006] Optionally, the fluid inlet comprises a plurality of discrete holes provided at the first end of the airfoil block, and the plurality of discrete holes are all in communication with the second fluid channel.

[0007] Optionally, the second fluid channel is bent.

[0008] Optionally, an extension portion and a spoiler portion are provided inside the airfoil block, the second fluid channel is provided in the extension portion, a plurality of spoiler columns are provided inside the spoiler, one end of the second fluid channel is connected to the fluid inlet, the other end of the second fluid channel is connected to the inlet of the spoiler, and the outlet of the spoiler is connected to the fluid outlet.

[0009] Optionally, a partition is provided between the extension portion and the spoiler portion, and the partition is provided with a plurality of through holes for connecting the extension portion and the spoiler portion.

[0010] Optionally, the spoiler column is a cylinder, a triangular column or a polygonal column.

[0011] Optionally, the length direction of the airfoil block is the same as the length direction of the plate body.

[0012] Optionally, the positions of the airfoil blocks of two adjacent rows of guide plates correspond one to one.

[0013] Optionally, the airfoil blocks of two adjacent rows of guide plates are arranged in opposite directions.

[0014] The present invention also provides a heat exchanger, which includes a shell and the above-mentioned heat exchange plate arranged inside the shell.

[0015] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art:

[0016] The present invention has airfoil blocks evenly distributed on the plate body, and a second fluid channel is provided inside the airfoil block, so that when the fluid passes through the airfoil block, it is divided into three paths, two of which flow through the first fluid channels on both sides of the airfoil block, and one of which flows through the second fluid channel inside the airfoil block. The fluid flowing out of the second fluid channel merges with the fluid in the first fluid channel, thereby reducing the thermal resistance of the airfoil block and further reducing the thermal resistance of the heat exchange plate. In addition, this design method can increase the flow rate of the fluid around the airfoil block, thereby enhancing the heat exchange capacity at the leading edge, middle and trailing edge of the airfoil block, thereby enhancing the heat transfer capacity of the entire heat exchange plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 This is a schematic structural diagram of the heat exchange plate according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of a flow path of a fluid according to an embodiment of the present invention;

[0021] Figure 3 is a cross-sectional view of the airfoil block along its height direction according to an embodiment of the present invention;

[0022] Figure 4This is a cross-sectional view of the airfoil block along its width direction according to an embodiment of the present invention.

[0023] Description of Reference Numerals

[0024] 1. Plate body; 2. First fluid channel; 3. Airfoil block; 31. Second fluid channel; 4. Fluid inlet; 41. Discrete hole; 5. Fluid outlet; 6. Extension; 61. Baffle; 7. Spoiler; 71. Spoiler column; 8. Partition; 81. Through hole. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] The following description sets forth many specific details to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the implementation methods in the specification are only part of the implementation methods of the present invention, not all of the implementation methods.

[0027] Research has found that the flow rate is faster at the highest point of the airfoil width, resulting in the best heat transfer effect. The fluid impacts the leading edge of the airfoil, forming a stagnation zone there, where the flow rate is lower, resulting in poor heat transfer effect. At the trailing edge of the airfoil, the fluid mixing ability is weak, resulting in a low-velocity zone and very poor heat transfer effect. To address this issue, this application proposes improvements to heat exchange plates with airfoil structures, one implementation of which is as follows:

[0028] Combine Figures 1 to 4 As shown, the heat exchange plate provided in an embodiment of the present invention includes a plate body 1 and multiple rows of guide plates disposed on the plate body 1. A first fluid channel 2 is formed between two adjacent rows of guide plates, thereby forming multiple first fluid channels 2 on the surface of the plate body 1 for fluid circulation. The first fluid channels 2 formed by the guide plates can be in the form of straight channels, corrugated channels, serpentine channels, or airfoil-shaped channels, and can be designed according to actual needs. The guide plates include multiple airfoil blocks 3 spaced apart, i.e., a gap is formed between two adjacent airfoil blocks 3 in the same group of guide plates. The size of the gap can be designed according to actual needs. A second fluid channel 31 is provided within the airfoil blocks 3. The airfoil blocks 3 have opposing first and second ends. The first end of the airfoil blocks 3 is provided with a fluid inlet 4 connected to the second fluid channel 31, and the second end of the airfoil blocks 3 is provided with a fluid outlet 5 connected to the second fluid channel 31. This allows some fluid to enter the second fluid channel 31 through the fluid inlet 4 and then merge with the other two fluid channels through the fluid outlet 5.

[0029] like Figure 2As shown, the present invention evenly distributes airfoil blocks 3 on the plate body 1, and a second fluid channel 31 is provided inside the airfoil block 3, so that when the fluid passes through the airfoil block 3, it is divided into three paths, two of which flow through the first fluid channels 2 on both sides of the airfoil block 3, and one of which flows through the second fluid channel 31 inside the airfoil block 3. The fluid flowing out of the second fluid channel 31 merges with the fluid in the first fluid channel 2, thereby reducing the thermal resistance of the airfoil block 3 and thus reducing the thermal resistance of the heat exchange plate. In addition, this design method can increase the flow rate of the fluid around the airfoil block 3, thereby strengthening the heat exchange capacity at the leading edge, middle and trailing edge of the airfoil block 3, thereby enhancing the heat transfer capacity of the entire heat exchange plate. In this application, the leading edge of the airfoil block 3 is the first end of the airfoil block 3, and the trailing edge of the airfoil block 3 is the second end of the airfoil block 3.

[0030] Combine Figure 3 and Figure 4 As shown, the fluid inlet 4 includes multiple discrete holes 41 disposed at the first end of the airfoil block 3. Each of the multiple discrete holes 41 communicates with the second fluid channel 31, increasing the flow rate of the fluid entering the second fluid channel 31. Preferably, the second fluid channel 31 is curved, thereby increasing the flow path of the fluid within the second fluid channel 31 and enhancing the heat exchange effect. Furthermore, multiple fluid outlets 5 can be provided, and the design can be tailored to meet actual needs.

[0031] like Figure 4 As shown, an extension portion 6 and a spoiler portion 7 are provided inside the airfoil block 3, and the second fluid channel 31 is provided in the extension portion 6. Specifically, at least one baffle 61 is provided inside the extension portion 6, and one end of the baffle 61 is connected to the inner wall of the extension portion 6, and a certain gap exists between the other end of the baffle 61 and the inner wall of the extension portion 6, so that the fluid flows from one side of the baffle 61 around the gap to the other side of the baffle 61, thereby increasing the flow path of the fluid. Further optimized, there are multiple baffles 61, and the positions of the gaps between two adjacent baffles 61 are opposite, so that the second fluid channel 31 bends and extends, further increasing the flow path of the fluid. The number of baffles 61 can be designed according to actual usage requirements to increase the flow path of the fluid inside the second fluid channel 31, thereby increasing the heat transfer capacity of the entire heat exchange plate. Preferably, there are two baffles 61.

[0032] The interior of the spoiler 7 is provided with a plurality of spoiler columns 71, and the plurality of spoiler columns 71 are evenly distributed inside the spoiler 7 to increase the spoiler effect. According to the actual situation, the spoiler columns 71 are arranged in a cross-flow or other form. One end of the second fluid channel 31 is connected to the fluid inlet 4, the other end of the second fluid channel 31 is connected to the inlet of the spoiler 7, and the outlet of the spoiler 7 is connected to the fluid outlet 5. This design method allows the fluid to enter the interior of the spoiler 7 after passing through the second fluid channel 31 to be turbulent, thereby increasing the heat transfer capacity. The fluid after turbulence then flows out through the fluid outlet 5 and mixes with the external fluid. When the fluids with different flow rates mix, the turbulence effect is further achieved, thereby increasing the heat exchange capacity. Specifically, a partition 8 is provided between the extension 6 and the spoiler 7, and a plurality of through holes 81 for connecting the extension 6 and the spoiler 7 are provided on the partition 8, so that the fluid flowing out of the second fluid channel 31 enters the spoiler 7 evenly. Among them, the spoiler column 71 is a cylinder, a triangular column or a polygonal column. It can be seen that the shape and number of the spoiler column 71 can be designed according to actual use requirements, so as to enhance the disturbance and further strengthen the heat transfer capacity.

[0033] In some embodiments, as Figure 1 As shown, the length direction of the airfoil block 3 is the same as the length direction of the plate body 1, which facilitates the fluid to enter the interior of the airfoil block 3 through the first end of the airfoil block 3. The positions of the airfoil blocks 3 of two adjacent rows of guide plates correspond one to one. And the setting directions of the airfoil blocks 3 of two adjacent rows of guide plates are opposite. In this design, a part of the first flow channel is formed between the widest part of the airfoil block 3 and the narrowest part of another adjacent airfoil block 3. At this time, the increase in flow rate brought about by the widest part of the airfoil block 3 can enhance heat transfer and compensate for the weakened heat exchange caused by the narrower part of the airfoil. Therefore, the heat exchange capacity of the heat exchange plate can be effectively ensured.

[0034] In other embodiments, the length of the airfoil block 3 is aligned with the length of the plate body 1, facilitating fluid flow through the first end of the airfoil block 3 and into the interior of the airfoil block 3. The airfoil blocks 3 of two adjacent rows of guide plates correspond in position to each other, and the airfoil blocks 3 of two adjacent rows of guide plates are arranged in the same orientation.

[0035] In other embodiments, the length direction of the airfoil block 3 is different from the length direction of the plate body 1, so that the first fluid channel 2 is bent, so that the airfoil block 3 plays a turbulent role for the fluid in the first fluid channel 2, thereby increasing the heat exchange effect.

[0036] It can be seen that the arrangement of the airfoil blocks 3 of the present invention is not limited and can be designed according to actual needs. In addition, the flow direction and normal spacing between adjacent airfoil blocks 3 can be designed according to actual needs to obtain higher heat transfer capacity.

[0037] In some embodiments, the width of the widest part of the airfoil block 3 is 0.2-2 mm; the length of the airfoil block 3 is 1-10 mm; the distance between the trailing edges of two adjacent airfoil blocks 3 in the same row of guide plates is 0.4-20 m; the normal spacing between two adjacent airfoil blocks 3 in two adjacent rows of guide plates is 0.4-20 mm; the diameter of the discrete hole 41 is 0.05-1 mm; the diameter of the second fluid channel 31 is 0.1-1.8 mm; the diameter of the spoiler column 71 is 0.05-0.5 mm; the plate body 1 is preferably made of a 1-5 mm metal plate, specifically a high-temperature alloy, aluminum or the like; the airfoil block 3 can be made by chemical etching, 3D printing, machining or the like.

[0038] The present invention also provides a heat exchanger, which includes a shell and the above-mentioned heat exchange plate arranged inside the shell. The heat exchange plate includes all the technical features of the above-mentioned heat exchange plate, so no detailed description is given here. Specifically, there can be multiple heat exchange plates. After the multiple heat exchange plates are stacked, they are fixed by a clamp and then placed in a diffusion welding furnace for welding to form a heat exchanger core. As needed, multiple heat exchanger cores can be processed separately and finally used in parallel or series. The inlet and outlet ends of the hot and cold sides of the heat exchanger core are sealed by argon arc welding to form a complete heat exchanger. Since this processing method is a conventional technology, no detailed description is given here.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0040] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments described herein, but is to be construed in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A heat exchange plate, characterized in that: The heat exchange plate comprises a plate body (1) and a plurality of rows of guide plates arranged on the plate body (1), a first fluid channel (2) is formed between two adjacent rows of the guide plates, the guide plate comprises a plurality of airfoil blocks (3) arranged at intervals, a second fluid channel (31) is provided inside the airfoil block (3), the airfoil block (3) has a first end and a second end opposite to each other, the first end of the airfoil block (3) is provided with a fluid inlet (4) communicating with the second fluid channel (31), and the second end of the airfoil block (3) is provided with a fluid outlet (5) communicating with the second fluid channel (31); An extension portion (6) and a spoiler portion (7) are provided inside the airfoil block (3); the second fluid channel (31) is provided in the extension portion (6); a plurality of spoiler columns (71) are provided inside the spoiler portion (7); one end of the second fluid channel (31) is communicated with the fluid inlet (4); the other end of the second fluid channel (31) is communicated with the inlet of the spoiler portion (7); and the outlet of the spoiler portion (7) is communicated with the fluid outlet (5); The positions of the airfoil blocks (3) of the guide plates in two adjacent rows correspond one to one, and the arrangement directions of the airfoil blocks (3) of the guide plates in two adjacent rows are opposite.

2. The heat exchange plate according to claim 1, characterized in that The fluid inlet (4) comprises a plurality of discrete holes (41) arranged at the first end of the airfoil block (3), and the plurality of discrete holes (41) are all in communication with the second fluid channel (31).

3. The heat exchange plate according to claim 1, characterized in that The second fluid channel (31) is bent.

4. The heat exchange plate according to claim 1, characterized in that A partition (8) is provided between the extension portion (6) and the spoiler portion (7), and a plurality of through holes (81) for connecting the extension portion (6) and the spoiler portion (7) are provided on the partition (8).

5. The heat exchange plate according to claim 1, characterized in that The spoiler column (71) is a cylinder, a triangular column or a polygonal column.

6. The heat exchange plate according to claim 1, characterized in that The length direction of the airfoil block (3) is the same as the length direction of the plate body (1).

7. A heat exchanger, characterized in that: The heat exchanger includes a shell and a heat exchange plate according to any one of claims 1 to 6 arranged inside the shell.

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