Heat exchanger

Abstract

The utility model provides a heat exchanger. The heat exchanger comprises a substrate; the heat exchange layer is arranged on one side of the base plate, the heat exchange layer comprises multiple sets of heat exchange units, the multiple sets of heat exchange units are arranged at intervals in the first direction, a first heat exchange channel is formed between every two adjacent sets of heat exchange units in a clamped mode, each set of heat exchange unit comprises at least two fins, and the at least two fins are distributed at intervals in the second direction; in the second direction, at least two fins are arranged in a staggered manner; wherein the first direction is different from the second direction. According to the heat exchanger, the two fins in the second direction are staggered, gas can be scattered by the fins distributed in the staggered mode, the flowing resistance and disorder degree are increased, the retention time of the gas in the heat exchange channel is prolonged, then the heat exchange time of the gas and the fins is prolonged, and therefore the heat exchange efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of heat exchangers, and in particular relates to a heat exchanger. Background Art

[0002] A heat exchanger is a device used to transfer heat between fluids and is widely used in processes such as heating, cooling, evaporation, and condensation. Finned heat exchangers are a common type of heat exchanger, used to exchange heat between air and other fluids.

[0003] Existing fin-type heat exchangers typically consist of a base plate and multiple fins spaced along a certain direction. Adjacent fins are sandwiched to form a flow channel for gas flow, where the gas exchanges heat with the fins. Since the gas encounters fewer obstacles within the flow channel after entering the heat exchanger, resistance is low and flow is fast, resulting in shorter heat exchange times and lower heat exchange efficiency. Utility Model Content

[0004] The embodiment of the present application provides a heat exchanger to solve the problem that the flow channel of the existing fin-type heat exchanger has fewer obstacles, so the airflow resistance is small and the flow rate is fast, which in turn leads to a short heat exchange time and low heat exchange efficiency.

[0005] The present invention provides a heat exchanger comprising:

[0006] substrate;

[0007] a heat exchange layer disposed on one side of the substrate, the heat exchange layer comprising a plurality of heat exchange units, the plurality of heat exchange units being spaced apart along a first direction, a first heat exchange channel being formed between two adjacent groups of heat exchange units, each group of heat exchange units comprising at least two fins, at least two of the fins being spaced apart along a second direction, and at least two of the fins being staggered in the second direction;

[0008] The first direction and the second direction are different.

[0009] Optionally, in the second direction, the lengths of two adjacent fins are different.

[0010] Optionally, each of the fins is penetrated by a spoiler hole, and each of the spoiler holes is connected to two adjacent first heat exchange channels.

[0011] Optionally, in the second direction, the spoiler holes on two adjacent fins have different apertures.

[0012] Optionally, in the first direction, the spoiler holes on two adjacent fins have different apertures.

[0013] Optionally, in the first direction, the spoiler holes on two adjacent fins are staggered.

[0014] Optionally, each group of the heat exchange units includes multiple fin groups, each of the fin groups includes four fins, and the length ratio of the four fins is 9:8:5:4.

[0015] Optionally, the fin comprises:

[0016] a first side plate connected to the base plate;

[0017] a second side plate connected to the base plate and arranged opposite to the first side plate;

[0018] a top plate, connecting the first side plate and the second side plate, and arranged opposite to the base plate;

[0019] The first side plate, the second side plate, the base plate and the top plate are arranged to form a second heat exchange channel. In the second direction, two adjacent second heat exchange channels are at least partially connected.

[0020] Optionally, in the second direction, the widths of two adjacent second heat exchange channels are different.

[0021] Optionally, the heat exchange layer includes two groups, and the two groups of heat exchange layers are arranged on two sides of the substrate opposite to each other.

[0022] The heat exchanger provided in the embodiment of the present application has a heat exchange layer of a substrate including a plurality of groups of heat exchange units spaced apart along a first direction, and each group of heat exchange units includes at least two fins spaced apart along a second direction, and at least two fins are staggered in the second direction, that is, in a heat exchange channel formed by two adjacent groups of heat exchange units, since the two fins are staggered with each other in the second direction, the heat exchange channel does not extend in a straight line in the second direction, but is formed by connecting multiple sections of flow channels that are at least partially staggered with each other, that is, when the gas flows from between the two upstream fins to between the two adjacent downstream fins, the gas will be broken up by the staggered fins, and then turbulence will be formed within a certain range. At the same time, the flow velocity of the gas at different positions in the heat exchange channel will also be different, which increases the flow resistance and disorder, prolongs the residence time of the gas in the heat exchange channel, and then prolongs the heat exchange time between the gas and the fins, thereby improving the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0024] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0025] Figure 1 A schematic structural diagram of the heat exchanger provided in an embodiment of the present application.

[0026] Figure 2 Schematic diagram of the connection between the substrate and the heat exchange layer of the heat exchanger provided in an embodiment of the present application.

[0027] Figure 3 A schematic structural diagram of the flow-turbulating holes of the heat exchanger provided in an embodiment of the present application.

[0028] Figure 4 Another structural schematic diagram of the spoiler holes of the heat exchanger provided in an embodiment of the present application.

[0029] Figure 5 A temperature field comparison diagram of the heat exchanger in the second direction provided in an embodiment of the present application.

[0030] Figure 6 Another temperature field comparison diagram of the heat exchanger in the second direction provided in an embodiment of the present application.

[0031] Figure 7 Another temperature field comparison diagram of the heat exchanger in the second direction provided in an embodiment of the present application.

[0032] Figure 8 Another temperature field comparison diagram of the heat exchanger in the second direction provided in an embodiment of the present application.

[0033] Figure 9 A velocity field comparison diagram of the heat exchanger in the second direction provided in an embodiment of the present application.

[0034] Figure 10 Another velocity field comparison diagram of the heat exchanger in the second direction provided in an embodiment of the present application.

[0035] Figure 11 Another velocity field comparison diagram of the heat exchanger in the second direction provided in an embodiment of the present application.

[0036] Figure 12 Another velocity field comparison diagram of the heat exchanger in the second direction provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot 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 said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0040] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0042] The embodiment of the present application provides a heat exchanger to solve the problem that the flow channel of the existing fin-type heat exchanger has fewer obstacles, resulting in small airflow resistance and fast flow rate, which in turn leads to short heat exchange time and low heat exchange efficiency. The following will be explained with reference to the accompanying drawings.

[0043] The heat exchanger provided in the embodiment of this application is shown in Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of the heat exchanger provided in the embodiment of the present application. Figure 2 This is a schematic diagram illustrating the connection between the substrate and heat exchange layer of a heat exchanger provided in an embodiment of the present application. The heat exchanger includes a substrate 1 and a heat exchange layer. The heat exchange layer is disposed on one side of the substrate 1 and includes multiple groups of heat exchange units spaced apart along a first direction. A first heat exchange channel 3 is formed between two adjacent groups of heat exchange units. Each group of heat exchange units includes at least two fins 2, spaced apart along a second direction. In the second direction, at least two fins 2 are staggered. The first and second directions are different.

[0044] In the heat exchanger provided in the embodiment of the present application, the heat exchange layer of the substrate 1 includes a plurality of groups of heat exchange units spaced apart along a first direction, and each group of heat exchange units includes at least two fins 2 spaced apart along a second direction, and at least two fins 2 are staggered in the second direction, that is, in the heat exchange channel formed by the two adjacent groups of heat exchange units, since the two fins 2 are staggered with each other in the second direction, the heat exchange channel does not extend in a straight line in the second direction, but is formed by connecting multiple sections of flow channels that are at least partially staggered with each other, that is, when the gas flows from between the two upstream fins 2 to between the two adjacent downstream fins 2, the gas will be dispersed by the staggered fins 2, and then form turbulence within a certain range. At the same time, the flow velocity of the gas at different positions in the heat exchange channel will also be different, which increases the flow resistance and chaos, prolongs the residence time of the gas in the heat exchange channel, and then prolongs the heat exchange time between the gas and the fins 2, thereby improving the heat exchange efficiency.

[0045] It is understandable that the gas flows along the second direction, and the inlet and outlet of the gas flow are not further limited here. The inlet and outlet can be respectively set at one end and the other end of each group of heat exchange units along the second direction according to specific usage.

[0046] Optionally, the second direction may be perpendicular to the first direction.

[0047] Optionally, in the second direction, the lengths of two adjacent fins 2 are different. Since the lengths of two adjacent fins 2 in the second direction are different, the disorder of the gas flow in the heat exchange channel is increased, the range of the formed turbulence is further increased, the time the gas stays in the heat exchange channel is prolonged, and the heat exchange time between the gas and the fins 2 is prolonged, thereby improving the heat exchange efficiency.

[0048] Optionally, each heat exchange unit includes multiple fin groups 2, and each fin group 2 includes four fins 2. By performing heat exchange simulations on fins 2 with different length ratios, a large amount of experimental data on temperature field and velocity field is obtained. Only part of the experimental results are shown below. Figures 5 to 8 ,in, Figure 5 Each corresponding fin 2 group includes four fins 2, and the length ratio of the four fins 2 is 12:7:4:3, that is, the arrangement of the fins 2 can be 12mm, 7mm, 4mm, and 3mm. Figure 6 Each corresponding fin 2 group includes four fins 2, and the length ratio of the four fins 2 is 4:5:8:9, that is, the arrangement of the fins 2 can be 4mm, 5mm, 8mm, and 9mm. Figure 7 Each corresponding fin 2 group includes four fins 2, and the length ratio of the four fins 2 is 6.5:6.5:6.5:6.5, that is, the arrangement of the fins 2 can be 6.5mm, 6.5mm, 6.5mm, Figure 8 Each corresponding fin 2 group includes four fins 2, and the length ratio of the four fins 2 is 9:8:5:4, that is, the arrangement of the fins 2 can be 9mm, 8mm, 5mm, and 4mm. As can be seen from the figure, when the fin 2 arrangement is 4mm, 5mm, 8mm, and 9mm, there are different temperature gradients near the upstream fin 2 and the downstream fin 2. When the fin 2 arrangement increases from 4mm, 5mm, 8mm, and 9mm to 12mm, 7mm, 4mm, and 3mm, this phenomenon shows a trend of first increasing and then decreasing. It is the largest when the fin 2 arrangement is 9mm, 8mm, 5mm, and 4mm. This leads to a larger heat exchange temperature difference, improves the driving force of heat exchange, and the gradient of the temperature field at this time is more gentle, which is more conducive to the synergy of the field.

[0049] See also Figures 9 to 12 ,in, Figure 9Each corresponding fin 2 group includes four fins 2, and the length ratio of the four fins 2 is 12:7:4:3, that is, the arrangement of the fins 2 can be 12mm, 7mm, 4mm, and 3mm. Figure 10 Each corresponding fin 2 group includes four fins 2, and the length ratio of the four fins 2 is 4:5:8:9, that is, the arrangement of the fins 2 can be 4mm, 5mm, 8mm, and 9mm. Figure 11 Each corresponding fin 2 group includes four fins 2, and the length ratio of the four fins 2 is 6.5:6.5:6.5:6.5, that is, the arrangement of the fins 2 can be 6.5mm, 6.5mm, 6.5mm, Figure 12 Each corresponding fin 2 group includes four fins 2, and the length ratio of the four fins 2 is 9:8:5:4, that is, the fins 2 can be arranged in 9mm, 8mm, 5mm, and 4mm. As can be seen from the figure, when the fins 2 are arranged in 9mm, 8mm, 5mm, and 4mm, the recirculation effect near the downstream fins 2 is more obvious, and a recirculation area and a high-speed zone where the boundary layer reattaches are generated. In addition, as the speed increases, the boundary layer near the fins 2 will shed faster.

[0050] Through the above comparative analysis, it can be seen that 9:8:5:4 is the preferred length setting ratio of the fins 2. When the multiple fins 2 of each heat exchange unit are divided into multiple fin groups according to this ratio, the heat exchange effect of the heat exchanger is optimal.

[0051] Optionally, each fin 2 is provided with a flow-turbulating hole 24, and each flow-turbulating hole 24 is connected to two adjacent first heat exchange channels 3. By providing the flow-turbulating holes 24, two adjacent heat exchange channels can be connected through the flow-turbulating holes 24, that is, the gas in the heat exchange channel will escape laterally from the flow-turbulating holes 24, causing the gas to flow laterally and generate vortices, which is conducive to destroying the boundary layer between adjacent heat exchange channels and improving the overall heat exchange effect of the heat exchanger.

[0052] The shape of the spoiler hole 24 is not further limited here. For example, it can be circular. Figure 3 , Figure 3 A structural diagram of the baffle hole of the heat exchanger provided in the embodiment of the present application, or a special shape, please refer to Figure 4 , Figure 4 This is another structural schematic diagram of the spoiler hole of the heat exchanger provided in an embodiment of the present application, or an elliptical shape, etc.

[0053] Optionally, the size of each fin 2 is proportional to the diameter of the spoiler hole 24 on the fin 2, that is, the longer the fin 2, the larger the diameter of the spoiler hole 24, and the shorter the fin 2, the smaller the diameter of the spoiler hole 24, thereby avoiding reducing the strength of the fin 2 due to the provision of the spoiler hole 24. At the same time, the provision of the spoiler hole 24 also reduces the volume of the fin 2 and reduces the material cost of the fin 2.

[0054] Optionally, the substrate 1 and the fins 2 may both be made of a material with good thermal conductivity and easy to manufacture, such as an aluminum plate.

[0055] Optionally, in the second direction, the turbulence holes 24 on two adjacent fins 2 have different apertures. Since the apertures of the two adjacent turbulence holes 24 in the second direction are different, the amount of gas flowing laterally is different, thereby increasing the disorder of the gas flow, prolonging the time the gas stays in the heat exchange channel, and further extending the heat exchange time between the gas and the fins 2, thereby improving the heat exchange efficiency.

[0056] Optionally, in the first direction, the apertures of the turbulence holes 24 on the two adjacent fins 2 are different, so the amount of gas that moves laterally in the first direction is also different, further increasing the disorder of the gas flow, extending the time the gas stays in the heat exchange channel, and then extending the heat exchange time between the gas and the fins 2, thereby improving the heat exchange efficiency.

[0057] Optionally, in the first direction, the turbulence holes 24 on two adjacent fins 2 are staggered, so that the positions where the gas moves laterally in the first direction are also different, further increasing the disorder of the gas flow.

[0058] Optionally, the fin 2 includes a first side plate 21, a second side plate 22, and a top plate 23. The first side plate 21 is connected to the base plate 1; the second side plate 22 is connected to the base plate 1 and is disposed opposite the first side plate 21; the top plate 23 connects the first side plate 21 and the second side plate 22 and is disposed opposite the base plate 1. The first side plate 21, the second side plate 22, the base plate 1, and the top plate 23 enclose a second heat exchange channel 4, and two adjacent second heat exchange channels 4 are at least partially connected in the second direction.

[0059] That is, the fins 2 can be U-shaped plates, and each U-shaped plate is directly clamped with the base plate 1 to form a second heat exchange channel 4, thereby improving the installation efficiency of the fins 2. That is, when two fins 2 are installed in the same manner along the first direction, two second heat exchange channels 4 and one first heat exchange channel 3 are formed between the two U-shaped plates, for a total of three heat exchange channels, while only one first heat exchange channel 2 is formed between the two straight plates.

[0060] As an alternative embodiment, the fin 2 may also be a V-shaped plate, which will not be further described here.

[0061] Optionally, in the second direction, the widths of two adjacent second heat exchange channels 4 are different. That is, the widths of the U-bends of the U-shaped plates are different, so that the flow cross-sections in different U-shaped plates are different, and the flow velocities of the airflow in different U-shaped plates in the second direction are also different, further increasing the airflow disorder and improving the heat exchange efficiency.

[0062] Optionally, the fins 2 may be welded to the base plate 1 .

[0063] Optionally, the heat exchange layer includes two groups, and the two groups of heat exchange layers are arranged on both sides of the substrate 1 to further increase the heat exchange area. Furthermore, the two groups of heat exchange layers can be arranged symmetrically.

[0064] The scope of use of the heat exchanger provided in the embodiment of the present application is not further limited here. For example, it can be used in the field of air separation equipment, such as the main heat exchanger, subcooler, condenser evaporator and other low-temperature heat exchangers in air separation equipment, which can save equipment investment and installation costs and reduce unit energy consumption; or it can be used in the field of petrochemical industry. In the process of deep-cold separation of ethylene, synthetic ammonia nitrogen washing, natural gas, oilfield gas separation and liquefaction, the heat exchanger provided in the embodiment of the present application has the advantages of large processing capacity, good separation effect and low energy consumption; or it can be used in the field of engineering machinery. In equipment such as automobile and locomotive radiators, excavator oil coolers, refrigerator radiators, and high-power transformer radiators, the heat exchanger can be used for heat dissipation and temperature control; or it can be used in the field of shipbuilding and marine engineering. In the ship cooling system, the heat exchanger is used to cool seawater or fresh water to maintain the engine and other equipment. Normal operating temperature; or used in the field of automobile manufacturing, in the automobile engine cooling system, the heat exchanger is used to control the temperature of the engine to prevent overheating; or used in the field of food and beverage industry, in food processing and beverage production, the heat exchanger is used to heat or cool the raw materials, such as cooking, pasteurization, etc.; or used in the field of medical equipment, in medical equipment such as hemodialysis machines, disinfection equipment, etc., the heat exchanger is used to control the temperature of the medium; or used in the field of environmental engineering, in waste gas treatment and wastewater treatment equipment, the heat exchanger is used to heat or cool the treatment medium to promote chemical reactions or improve treatment efficiency; or used in the field of centralized heating and heating systems, heat exchangers are used in the waste heat area heating of thermal power plants, heating bath water, etc.; or used in the field of solar energy utilization, in solar thermal utilization systems, heat exchangers are used to absorb and transfer solar thermal energy.

[0065] In the above embodiments, the description of each embodiment has its own emphasis. For parts not described in detail in a particular embodiment, please refer to the relevant description of other embodiments. The above describes the heat exchanger provided in the embodiments of the present application in detail. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A heat exchanger, characterized in that: include: substrate; a heat exchange layer disposed on one side of the substrate, the heat exchange layer comprising a plurality of heat exchange units, the plurality of heat exchange units being spaced apart along a first direction, a first heat exchange channel being formed between two adjacent groups of heat exchange units, each group of heat exchange units comprising at least two fins, at least two of the fins being spaced apart along a second direction, and at least two of the fins being staggered in the second direction; The first direction and the second direction are different.

2. The heat exchanger according to claim 1, characterized in that In the second direction, the lengths of two adjacent fins are different.

3. The heat exchanger according to claim 1, characterized in that A flow-turbulating hole is formed through each of the fins, and each of the flow-turbulating holes is connected to two adjacent first heat exchange channels.

4. The heat exchanger according to claim 3, characterized in that In the second direction, the spoiler holes on two adjacent fins have different apertures.

5. The heat exchanger according to claim 3, characterized in that In the first direction, the spoiler holes on two adjacent fins have different apertures.

6. The heat exchanger according to claim 3, characterized in that In the first direction, the spoiler holes on two adjacent fins are staggered.

7. The heat exchanger according to claim 1, characterized in that Each group of the heat exchange units includes a plurality of fin groups, each of the fin groups includes four fins, and the length ratio of the four fins is 9:8:5:

4.

8. The heat exchanger according to claim 1, characterized in that The fin comprises: a first side plate connected to the base plate; a second side plate connected to the base plate and arranged opposite to the first side plate; a top plate, connecting the first side plate and the second side plate, and arranged opposite to the base plate; The first side plate, the second side plate, the base plate and the top plate are arranged to form a second heat exchange channel. In the second direction, two adjacent second heat exchange channels are at least partially connected.

9. The heat exchanger according to claim 8, characterized in that In the second direction, the widths of two adjacent second heat exchange channels are different.

10. The heat exchanger according to claim 1, characterized in that The heat exchange layer includes two groups, and the two groups of heat exchange layers are arranged on two sides of the substrate opposite to each other.

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