Printed circuit board heat exchanger and heat transfer equipment in thermodynamic system

Abstract

The invention provides a printed circuit board heat exchanger and heat transfer equipment in a thermodynamic system, the printed circuit board heat exchanger comprises a heat exchange shell, a heat exchange cavity is formed in the heat exchange shell, and a plurality of branch and confluence structures which are arranged in sequence are formed in the heat exchange cavity; the hot working medium input pipe and the hot working medium output pipe are installed on one side of the heat exchange shell. The cold working medium input pipe and the cold working medium output pipe are mounted on one side of the heat exchange shell; the heat exchange group comprises a hot working medium heat exchange plate and a cold working medium heat exchange plate which are mounted in the heat exchange cavity; a cold working medium is shunted through the first shunting and converging structure, enters the at least one cold working medium heat exchange plate, is converged through the second shunting and converging structure and then flows out of the cold working medium output pipe; the hot working medium is divided into at least one hot working medium heat exchange plate through the third sub-confluence structure and flows out of the hot working medium output pipe after being converged through the fourth sub-confluence structure, and the included angle between the flowing direction in the sub-confluence structure and the overflowing cross section in the heat exchange set is a preset angle.

Description

Technical Field

[0001] The present application relates to the field of printed circuit technology, and more specifically, to a printed circuit board heat exchanger and a heat transfer device in a thermal system. Background Art

[0002] The supercritical carbon dioxide (sCO2) Brayton cycle power / generation system can utilize any type of high-temperature heat source (such as focused solar energy, fossil energy, nuclear energy, industrial waste heat, etc.), and can be used as a distributed, mobile power generation or power propulsion system. In recent years, it has become a cutting-edge technology that is being developed in the field of new power / power generation.

[0003] Since the working medium needs to work under high pressure, according to the relationship between the pressure bearing capacity of the pressure vessel or pressure pipeline and the channel cross-sectional size and wall thickness, the smaller channel cross-sectional size allows the use of a smaller metal inter-wall thickness, thereby reducing the size and weight of the heat exchange core. In practice, printed circuit board microchannel heat exchangers are usually used, and the high-pressure fluid heat exchange flow channel usually uses a micro-channel with a hydraulic diameter of about 1 to 2 mm, which is conducive to improving the compactness of the system, reducing the thermal inertia of the system, and thus improving the dynamic response characteristics of the power / power generation system.

[0004] However, in order to achieve a larger heat exchange capacity, the heat exchange core of the related art often has a huge number (such as tens of thousands) of parallel micro channels. After the heat exchanger of the related art is connected to the main pipeline of the power / power generation system, the heat exchanger seriously reduces the compactness of the system, increases the thermal inertia of the equipment, and is not conducive to the dynamic response characteristics of the system under variable load. Summary of the invention

[0005] In view of this, the present application provides a printed circuit board heat exchanger and a heat transfer device in a thermal system.

[0006] One aspect of the present application provides a printed circuit board heat exchanger, comprising:

[0007] A heat exchange shell, wherein a heat exchange cavity is formed in the heat exchange shell, and a plurality of flow-dividing and converging structures arranged in sequence are formed in the heat exchange cavity;

[0008] The heat medium input pipe and the heat medium output pipe are installed on one side of the heat exchange shell;

[0009] The cold working medium input pipe and the cold working medium output pipe are installed on one side of the heat exchange shell;

[0010] At least one heat exchange group, the heat exchange group comprising a hot medium heat exchange plate and a cold medium heat exchange plate installed in the heat exchange cavity;

[0011] Among them, the cold working medium is divided into at least one of the above-mentioned cold working medium heat exchange plate through the first above-mentioned branch and converging flow structure and then flows out from the above-mentioned cold working medium output pipe after being converged through the second above-mentioned branch and converging flow structure; the hot working medium is divided into at least one of the above-mentioned hot working medium heat exchange plate through the third above-mentioned branch and converging flow structure and then flows out from the above-mentioned hot working medium output pipe after being converged through the fourth above-mentioned branch and converging flow structure, wherein the angle between the working medium flow direction in the above-mentioned branch and converging flow structure and the flow section in the above-mentioned heat exchange group is a preset angle.

[0012] According to an embodiment of the present application, the preset angle is 0-60°.

[0013] According to an embodiment of the present application, a branch-shaped bifurcated flow channel is arranged in the above-mentioned branch-and-converge flow structure, and the above-mentioned branch-shaped bifurcated flow channel is constructed to divert or converge the working fluid to reduce the flow resistance of the working fluid, and distribute the flow between the parallel channels according to actual needs. The hot working fluid heat exchange plate and the cold working fluid heat exchange plate both include multiple parallel heat exchange channels.

[0014] According to an embodiment of the present application, the above-mentioned tree-shaped bifurcated flow channel includes:

[0015] A plurality of guide plates, wherein the flow channel formed by two adjacent guide plates or the inner wall of the flow dividing and converging structure and the nearest guide plate is connected to at least one of the hot working medium heat exchange plates or at least one of the cold working medium heat exchange plates.

[0016] According to an embodiment of the present application, when the flow channel formed by the inner wall of two adjacent guide plates or the above-mentioned branch and confluence structure and the nearest guide plate is connected to the above-mentioned hot working fluid heat exchange plate or the above-mentioned cold working fluid heat exchange plate, an inclined guide block is arranged between the above-mentioned guide plate and the above-mentioned hot working fluid heat exchange plate or the above-mentioned cold working fluid heat exchange plate, so that the working fluid enters the above-mentioned hot working fluid heat exchange plate or the above-mentioned cold working fluid heat exchange plate through the inclined surface of the above-mentioned guide block, or the working fluid in the above-mentioned hot working fluid heat exchange plate or the above-mentioned cold working fluid heat exchange plate enters the above-mentioned branch and confluence structure through the inclined surface of the above-mentioned guide block.

[0017] According to an embodiment of the present application, a pillar array confluence structure is provided in the above-mentioned branch and confluence structure, and the above-mentioned pillar array confluence structure is constructed to divert or converge the working fluid so that the above-mentioned working fluid can be diverted or mixed as the same type of working fluid at the above-mentioned pillar array confluence structure as required.

[0018] According to an embodiment of the present application, the pillar array bus structure includes:

[0019] A plurality of guide pillars, wherein the cross-sectional shape of the guide pillars is any polygonal or curved shape, and the curved shape includes a circle, an ellipse, a wing or a fish shape.

[0020] According to an embodiment of the present application, the cross-sectional dimensions of the plurality of flow guide pillars on one side close to the heat exchange group are smaller than the cross-sectional dimensions of the plurality of flow guide pillars on the other side, and the cross-sectional dimensions increase in a step-like manner; and / or

[0021] The distance between two adjacent flow guide pillars on one side close to the heat exchange group is smaller than the distance between two adjacent flow guide pillars on the other side, and the distance increases in a step-like manner.

[0022] According to an embodiment of the present application, a plurality of working medium flow channels are formed in the above-mentioned hot working medium heat exchange plate and the above-mentioned cold working medium heat exchange plate;

[0023] In the case where there are multiple heat exchange groups, the multiple heat exchange groups are stacked in sequence in the heat exchange cavity;

[0024] For any target pipe among the above-mentioned hot working medium input pipe, the above-mentioned hot working medium output pipe, the above-mentioned cold working medium input pipe and the cold working medium output pipe, the connection between the above-mentioned heat exchange shell and the above-mentioned target pipe is an arc structure, and the above-mentioned target pipe and the plate in the above-mentioned heat exchange group form a preset angle.

[0025] Another aspect of the present application provides a heat transfer device in a thermal system, comprising the printed circuit board heat exchanger as described above.

[0026] According to the embodiment of the present application, the cold working fluid and the hot working fluid enter their respective flow-dividing and converging structures through the hot working fluid input pipe and the hot working fluid output pipe respectively for diversion, and the diverted cold working fluid and the hot working fluid perform heat exchange in the hot working fluid heat exchange plate and the cold working fluid heat exchange plate, and then the cold working fluid and the hot working fluid after heat exchange are uniformly mixed through their respective flow-dividing and converging structures and then flow out from the hot working fluid input pipe and the hot working fluid output pipe. Since the angle between the working fluid flow direction in the flow-dividing and converging structure and the working fluid flow cross section in the heat exchange group is a preset angle, the compactness of the printed circuit board heat exchanger can be improved, the thermal inertia and the transient thermal stress during variable working conditions can be reduced, and the variable load response characteristics and system cycle efficiency of the power system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the present application will become more apparent through the following description of the embodiments of the present application with reference to the accompanying drawings, in which:

[0028] Figure 1 A schematic diagram showing the external appearance of a printed circuit board heat exchanger is shown;

[0029] Figure 2a A schematic diagram showing the connection between the flow dividing and converging structure and the heat exchange group is shown;

[0030] Figure 2b Shows Figure 2a An enlarged schematic diagram of a part of the structure;

[0031] Figure 3 A schematic structural diagram of a branch-shaped bifurcated flow channel according to another embodiment is shown;

[0032] Figure 4a A schematic structural diagram of a pillar array flow dividing and converging structure according to an embodiment of the present application is shown;

[0033] Figure 4b Shows Figure 4a A partially enlarged schematic diagram of a pillar array flow-dividing and converging structure;

[0034] Figure 5a A schematic structural diagram of a pillar array flow dividing and converging structure according to another embodiment of the present application is shown;

[0035] Figure 5b Shows Figure 5a A partially enlarged schematic diagram of a pillar array flow-dividing and converging structure;

[0036] Figure 6a A schematic structural diagram of a pillar array flow dividing and converging structure according to another embodiment of the present application is shown;

[0037] Figure 6b Shows Figure 6a Partially enlarged schematic diagram of the pillar array flow distribution structure.

[0038] In the above drawings, the meanings of the reference numerals are as follows:

[0039] 100-heat exchange shell;

[0040] 110-heat exchange chamber;

[0041] 120-dividing and converging flow structure;

[0042] 130-branched flow channel;

[0043] 131- deflector;

[0044] 132- guide block;

[0045] 140-pillar array confluence structure;

[0046] 141- diversion support;

[0047] 210- hot working medium input pipe;

[0048] 220-hot working medium output pipe;

[0049] 310-cold working medium input pipe;

[0050] 320- cold working medium output pipe;

[0051] 400-Heat exchange group. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0053] The terms used herein are only for describing specific embodiments and are not intended to limit the present application. The terms "include", "comprising", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0054] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0055] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0056] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present application. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present application.

[0057] Figure 1 A schematic diagram showing the external appearance of a printed circuit board heat exchanger is shown. Figure 2a A schematic diagram of the connection between the branching and converging flow structure 120 and the heat exchange group 400 is shown. Figure 2b Shows Figure 2a An enlarged schematic diagram of some of the structures in .

[0058] like Figure 1As shown, the printed circuit board heat exchanger includes a heat exchange housing 100 , a hot medium input pipe 210 and a hot medium output pipe 220 , a cold medium input pipe 310 and a cold medium output pipe 320 , and at least one heat exchange group 400 .

[0059] According to the embodiment of the present application, the heat exchange housing 100 may be composed of a box body and a cover plate, thereby forming a heat exchange cavity 110, and a plurality of flow-dividing and converging structures 120 arranged in sequence are formed in the heat exchange cavity 110. The shape of the heat exchange cavity 110 may be any shape, such as a polygonal column, a circular cylinder, and a curved column, etc. The material of the heat exchange housing 100 may be selected from materials with low thermal conductivity to prevent heat from being lost from the heat exchange housing 100 and affecting the surrounding electronic devices.

[0060] According to an embodiment of the present application, the hot medium input pipe 210 and the hot medium output pipe 220 are installed on one side of the heat exchange shell 100. The cold medium input pipe 310 and the cold medium output pipe 320 are installed on one side of the heat exchange shell 100. The cross-sectional shapes of the hot medium input pipe 210 and the hot medium output pipe 220, the cold medium input pipe 310 and the cold medium output pipe 320 can be any shape, usually a circle.

[0061] According to an embodiment of the present application, the heat exchange group 400 includes a hot working medium heat exchange plate and a cold working medium heat exchange plate installed in the heat exchange cavity 110. The hot working medium heat exchange plate and the cold working medium heat exchange plate are made of materials with good thermal conductivity, so that the hot working medium heat exchange plate and the cold working medium heat exchange plate can fully exchange heat in the heat exchange cavity 110, thereby improving the heat exchange efficiency.

[0062] According to an embodiment of the present application, the cold working medium is divided into at least one cold working medium heat exchange plate through the first branch flow structure 120 and converged through the second branch flow structure 120 before flowing out from the cold working medium output pipe 320; the hot working medium is divided into at least one hot working medium heat exchange plate through the third branch flow structure 120 and converged through the fourth branch flow structure 120 before flowing out from the hot working medium output pipe 220, wherein the angle between the working medium flow direction in the branch flow structure 120 and the working medium flow section in the heat exchange group 400 is a preset angle.

[0063] According to the embodiments of the present application, the cold working medium and the hot working medium may be any type of liquid or gas capable of heat exchange, such as water, oil and other liquids.

[0064] According to the embodiments of the present application, Figure 2a The preset angle θ shown can be set according to actual conditions, and usually the preset angle ranges from 0 to 60 degrees.

[0065] According to an embodiment of the present application, when a printed circuit board heat exchanger is used, hot working fluid and cold working fluid are respectively input through the hot working fluid input pipe 210 and the cold working fluid input pipe 310, and the hot working fluid and cold working fluid respectively enter the hot working fluid heat exchange plate and the cold working fluid heat exchange plate in the heat exchange chamber 110, and heat exchange is performed during the flow of the two media, so that the hot working fluid after heat exchange is respectively converged from multiple hot working fluid heat exchange plates through the branch flow structure 120 and then flows out from the hot working fluid output pipe 220. Similarly, the cold working fluid after heat exchange flows from multiple cold working fluid heat exchange plates into the branch flow structure after absorbing heat, and finally flows out from the cold working fluid output pipe 320 after being evenly mixed.

[0066] According to the embodiment of the present application, the cold medium and the hot medium enter their respective flow-dividing and converging structures 120 through the hot medium input pipe 210 and the hot medium output pipe 220 for diversion, and the diverted cold medium and the hot medium perform heat exchange in the hot medium heat exchange plate and the cold medium heat exchange plate, and then the cold medium and the hot medium after heat exchange are uniformly mixed through their respective flow-dividing and converging structures 120 and then flow out from the hot medium input pipe 210 and the hot medium output pipe 220. Since the angle between the flow direction of the medium in the flow-dividing and converging structure 120 and the flow cross section of the medium in the heat exchange group 400 is a preset angle, the compactness of the printed circuit board heat exchanger can be improved, the thermal inertia and the transient thermal stress during variable working conditions can be reduced, and the variable load response characteristics and system cycle efficiency of the power system can be improved.

[0067] According to an embodiment of the present application, when the inner wall of the branch and confluence flow structure 120 is in a straight line shape, a branch-shaped branch flow channel 130 is provided in the branch and confluence flow structure 120, such as Figure 2a and Figure 2b As shown, the branch-shaped bifurcated flow channel 130 is configured to divert or converge the working fluid to reduce the working fluid flow resistance and reasonably distribute the flow between the parallel heat exchange channels as needed. The hot working fluid heat exchange plate and the cold working fluid heat exchange plate both include multiple parallel heat exchange channels.

[0068] According to an embodiment of the present application, the inner wall of the branch flow structure 120 is in a straight line shape, which means that the cross-section of the side wall is a straight line, and the lengths of the two side faces in the cross-sectional view may be different, wherein the cross-sectional shape of the branch flow structure 120 may be a circle or other polygon such as a trapezoid, and the inner diameters at both ends of the branch flow structure 120 may be different.

[0069] According to the embodiments of the present application, the cavity-type distribution and junction box in the related art lack the ability to distribute and adjust the flow between parallel micro-channels, resulting in poor uniformity of the flow field and temperature field in the heat exchange chamber 110. Since the mixing process of the branch working fluids with different temperature levels from the parallel micro-channels is a typical irreversible thermodynamic entropy increase process, the heat-to-work conversion efficiency of the power / power generation cycle is damaged.

[0070] According to the embodiments of the present application, in the process of hot working fluid or cold working fluid entering the heat exchange group 400 or flowing out of the heat exchange group 400, flow distribution can be achieved as required through the branch-like branching flow channel 130, which is beneficial to reduce flow resistance and reduce irreversible losses.

[0071] According to the embodiments of the present application, Figure 2a and Figure 2b As shown, the branch-shaped bifurcated flow channel 130 includes a plurality of guide plates 131, wherein the flow channel formed by two adjacent guide plates 131 or the inner wall of the branch-converging structure 120 and the nearest guide plate 131 is connected to at least one hot medium heat exchange plate or at least one cold medium heat exchange plate. The guide plate 131 can be made of a material with good thermal conductivity, and can be in a strip shape.

[0072] According to an embodiment of the present application, a plurality of media channels arranged in sequence are formed inside the hot working fluid heat exchange plate and the cold working fluid heat exchange plate, and a flow channel formed by the inner wall of two adjacent guide plates 131 or the flow dividing and converging structure 120 and the nearest guide plate 131 is connected to at least one media channel on the hot working fluid heat exchange plate or the cold working fluid heat exchange plate, and the media flowing in different media channels are mixed in the flow channel and then flow into the hot working fluid heat exchange plate (or the cold working fluid heat exchange plate) or flow out of the hot working fluid heat exchange plate (or the cold working fluid heat exchange plate).

[0073] Figure 3 FIG. 1 is a schematic structural diagram of a branch-shaped bifurcated flow channel 130 according to another embodiment.

[0074] According to the embodiments of the present application, Figure 3 As shown, when the flow channel formed by the inner wall of two adjacent guide plates 131 or the flow-dividing and converging structure 120 and the nearest guide plate 131 is connected to at least two hot working medium heat exchange plates or at least one cold working medium heat exchange plate, an inclined guide block 132 is provided between the guide plate 131 and the hot working medium heat exchange plate or the cold working medium heat exchange plate, so that the working medium enters the hot working medium heat exchange plate or the cold working medium heat exchange plate through the inclined surface of the guide block 132, or the working medium in the hot working medium heat exchange plate or the cold working medium heat exchange plate enters the flow-dividing and converging structure 120 through the inclined surface of the guide block 132. The shape of the guide block 132 can be any shape with an inclined surface, such as a shuttle shape.

[0075] According to the embodiments of the present application, during the flow of the hot working medium or the cold working medium in the hot working medium heat exchange plate or the cold working medium heat exchange plate, the setting of the guide block 132 can reduce the flow resistance, thereby reducing the irreversible loss, and reasonably distribute the flow between the parallel heat exchange channels as needed.

[0076] Figure 4a A schematic structural diagram of a pillar array bus structure 140 according to an embodiment of the present application is shown. Figure 4b Shows Figure 4a A partially enlarged schematic diagram of the pillar array bus structure 140.

[0077] According to the embodiments of the present application, Figure 4a As shown, when the inner wall of the flow dividing and converging structure 120 is a curved surface, a pillar array converging structure 140 is provided in the flow dividing and converging structure 120, and the pillar array converging structure 140 is configured to divert or converge the working fluid so that the working fluid of the same type can be diverted or mixed as required at the pillar array converging structure 140.

[0078] According to an embodiment of the present application, the media in different media channels or hot working fluid heat exchange plates (or cold working fluid heat exchange plates) can be uniformly mixed and diverted at the pillar array confluence structure 140, and the media can be mixed or diverted while distributing the flow as needed.

[0079] According to an embodiment of the present application, the pillar array confluence structure 140 includes a plurality of flow guiding pillars 141, wherein the cross-sectional shape of the flow guiding pillars 141 is an arbitrary polygon or a curve shape, and the curve shape includes a circle, an ellipse, a wing shape, or a fish shape. The arbitrary polygon can be a triangle, a quadrilateral, etc. The number of the flow guiding pillars 141 needs to be set according to actual needs, and the specific number determines the speed of the medium flow rate and the uniformity of the medium temperature.

[0080] According to an embodiment of the present application, the medium flows to Figure 4b When the quadrilateral guide pillar 141 is shown, due to the existence of the guide pillar 141, the medium is divided into media with multiple flow directions at the guide pillar 141, and the media with different flow directions are converged between two adjacent guide pillars 141, so that the temperature of the medium entering the hot working medium heat exchange plate (or cold working medium heat exchange plate) or entering the cold working medium output pipe 320 (or hot working medium output pipe 220) is more uniform.

[0081] Figure 5a A schematic structural diagram of a pillar array bus structure 140 according to another embodiment of the present application is shown. Figure 5b Shows Figure 5a A partially enlarged schematic diagram of the pillar array bus structure 140. Figure 6a A schematic structural diagram of a pillar array bus structure 140 according to another embodiment of the present application is shown. Figure 6b Shows Figure 6a A partially enlarged schematic diagram of the pillar array bus structure 140.

[0082] According to an embodiment of the present application, the cross-sectional dimensions of the plurality of flow guide pillars 141 close to one side of the heat exchange group 400 are smaller than the cross-sectional dimensions of the plurality of flow guide pillars 141 on the other side, and the cross-sectional dimensions increase in a step-like manner. The spacing between two adjacent flow guide pillars 141 close to one side of the heat exchange group 400 is smaller than the spacing between two adjacent flow guide pillars 141 on the other side, and the spacing increases in a step-like manner.

[0083] According to an embodiment of the present application, the cross section of the flow guide pillar 141 is as follows: Figure 5a and Figure 5b In the case of the quadrilateral shown in FIG. 1 , the cross-sectional size of the guide pillar 141 on the side close to the hot medium heat exchange plate (or cold medium heat exchange plate) is smaller than the cross-sectional size of the plurality of guide pillars 141 on the other side.

[0084] According to an embodiment of the present application, the cross section of the flow guide pillar 141 is as follows: Figure 6a and Figure 6b In the case of the circular shape shown, the cross-sectional size of the guide pillar 141 on the side close to the hot medium heat exchange plate (or cold medium heat exchange plate) is smaller than the cross-sectional size of the plurality of guide pillars 141 on the other side.

[0085] According to the embodiment of the present application, multiple fluid flow channels (i.e., the medium channels mentioned above) are formed in the hot working medium heat exchange plate and the cold working medium heat exchange plate. The hot medium flows in the working medium flow channel, and the heat on the hot medium is dissipated through the hot working medium heat exchange plate, and the heat is transferred to the internal cold medium through the cold working medium heat exchange plate, thereby realizing the heat exchange function.

[0086] According to the embodiment of the present application, when there are multiple heat exchange groups 400, the multiple heat exchange groups 400 are stacked sequentially in the heat exchange cavity 110. By stacking the hot medium heat exchange plates and the cold medium heat exchange plates sequentially, heat exchange can be better achieved and the heat exchange efficiency can be improved.

[0087] According to the embodiment of the present application, for any target pipe among the hot medium input pipe 210, the hot medium output pipe 220, the cold medium input pipe 310 and the cold medium output pipe 320, the connection between the heat exchange shell 100 and the target pipe is an arc structure, and the target pipe is at a preset angle with the heat exchange group 400. The target pipe is preferably directly led outward along a direction perpendicular to the heat exchange plate, or is led outward through a shape transition component, so that the heat exchanger has a smaller outer size, thereby reducing space occupancy and improving space compactness.

[0088] According to the embodiments of the present application, the setting of the arc structure is expected to reduce the weight of the printed circuit board heat exchanger by 25% to 40%, and there is no need to set a thick heat exchange shell 100, which will occupy a considerable proportion of the volume and weight of the heat exchanger, thereby seriously reducing the compactness of the system and increasing the thermal inertia of the equipment. During variable load operation, large transient thermal stress will be formed in the heat exchange shell 100, which can easily damage the heat exchanger or shorten its service life, limiting the heating and cooling rate of the heat exchanger and the system's variable load dynamic adjustment capability.

[0089] According to the embodiments of the present application, the heating rate of the printed circuit board heat exchanger of the present application can reach 10°C / s, and the flow distribution unevenness is less than 10%, thereby substantially improving the compactness of the heat exchanger, reducing thermal inertia and transient thermal stress during variable operating conditions, and improving the variable load response characteristics and cycle efficiency of the power system.

[0090] According to the embodiment of the present application, a flow dividing and converging structure with internal flow channels (i.e., a branch-shaped bifurcated flow channel 130, a pillar array converging structure 140, etc.) is etched inside the heat exchange shell 100, the flow dividing and converging structure 120, the hot working medium heat exchange plate and the cold working medium heat exchange plate, and is integrated with the heat exchange shell 100 by etching and diffusion welding processes. The flow dividing and converging structure is a part of the heat exchange shell 100 and plays a role in heat exchange between the cold and hot working mediums. Since the heavy heat exchange shell 100 is substantially reduced, the compactness of the printed circuit board heat exchanger can be substantially improved, the thermal inertia and transient thermal stress under variable working conditions can be reduced, and the variable load response characteristics of the power system can be improved.

[0091] According to the embodiments of the present application, through various flow channel layout forms of the branch and confluence structures, the shape, size, and density of the flow channels can be flexibly designed to precisely adjust the mass and energy distribution between the parallel micro channels (i.e., the working fluid flow channels), improve the uniformity of the flow and temperature distribution in the printed circuit board heat exchanger, reduce irreversible entropy increase, and improve the circulation efficiency. The branch-shaped bifurcated flow channels 130 and the pillar array confluence structure 140 can further reduce the flow resistance and improve the circulation efficiency of the power system.

[0092] According to an embodiment of the present application, a heat transfer device in a thermal system includes the printed circuit board heat exchanger as described above.

[0093] According to the embodiments of the present application, the heat transfer device can be a heat transfer device for a thermal system or a heat dissipation device for an electronic device. For example, it can be a heat extraction device, a heat recovery device, and a cooling device in a supercritical carbon dioxide power / power generation system, or it can be various high-power power electronic devices. The sizes of printed circuit board heat exchangers for different purposes are different.

[0094] According to the embodiment of the present application, the cold medium and the hot medium enter their respective flow-dividing and converging structures 120 through the hot medium input pipe 210 and the hot medium output pipe 220 for diversion, and the diverted cold medium and the hot medium perform heat exchange in the hot medium heat exchange plate and the cold medium heat exchange plate, and then the cold medium and the hot medium after heat exchange are uniformly mixed through their respective flow-dividing and converging structures 120 and then flow out from the hot medium input pipe 210 and the hot medium output pipe 220. Since the angle between the flow direction of the medium in the flow-dividing and converging structure 120 and the flow cross section of the medium in the heat exchange group 400 is a preset angle, the compactness of the printed circuit board heat exchanger can be improved, the thermal inertia and the transient thermal stress during variable working conditions can be reduced, and the variable load response characteristics and system cycle efficiency of the power system can be improved.

[0095] The embodiments of the present application are described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present application. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination. The scope of the present application is limited by the attached claims and their equivalents. Without departing from the scope of the present application, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present application.

Claims

1. A printed circuit board heat exchanger, characterized in that: include: A heat exchange shell, wherein a heat exchange cavity is formed in the heat exchange shell, and a plurality of flow-dividing and converging structures arranged in sequence are formed in the heat exchange cavity; A heat medium input pipe and a heat medium output pipe are installed on one side of the heat exchange shell; A cold working medium input pipe and a cold working medium output pipe are installed on one side of the heat exchange shell; at least one heat exchange group, the heat exchange group comprising a hot medium heat exchange plate and a cold medium heat exchange plate installed in the heat exchange cavity; The cold working medium is divided into at least one cold working medium heat exchange plate through the first flow branching structure and converged through the second flow branching structure before flowing out from the cold working medium output pipe; the hot working medium is divided into at least one hot working medium heat exchange plate through the third flow branching structure and converged through the fourth flow branching structure before flowing out from the hot working medium output pipe, wherein the angle between the flow direction in the flow branching structure and the flow cross section in the heat exchange group is a preset angle.

2. The heat exchanger according to claim 1, characterized in that: The preset angle is 0~60°.

3. The heat exchanger according to claim 1 or 2, characterized in that: A branch-shaped bifurcated flow channel is arranged in the branch-convergent flow structure, and the branch-shaped bifurcated flow channel is configured to divert or converge the working fluid to reduce the flow resistance of the working fluid and distribute the flow between the parallel heat exchange channels as required. The hot working fluid heat exchange plate and the cold working fluid heat exchange plate both include multiple parallel heat exchange channels.

4. The heat exchanger according to claim 3, characterized in that: The branch-shaped bifurcated flow channel comprises: A plurality of guide plates, wherein the flow channel formed by two adjacent guide plates or the inner wall of the flow dividing and converging structure and the nearest guide plate is connected to at least one of the hot working medium heat exchange plates or at least one of the cold working medium heat exchange plates.

5. The heat exchanger according to claim 4, characterized in that: In the case where the flow channel formed by the inner wall of two adjacent guide plates or the flow-dividing and converging structures and the nearest guide plate is connected to the hot working medium heat exchange plate or the cold working medium heat exchange plate, an inclined guide block is provided between the guide plate and the hot working medium heat exchange plate or the cold working medium heat exchange plate, so that the working medium enters the hot working medium heat exchange plate or the cold working medium heat exchange plate through the inclined surface of the guide block, or the working medium in the hot working medium heat exchange plate or the cold working medium heat exchange plate enters the flow-dividing and converging structure through the inclined surface of the guide block.

6. The heat exchanger according to claim 1 or 2, characterized in that: A pillar array confluence structure is provided in the flow branching and confluence structure, and the pillar array confluence structure is configured to branch or converge the working fluid, so that the working fluid of the same type can be branched or mixed as required at the pillar array confluence structure.

7. The heat exchanger according to claim 6, characterized in that The pillar array bus structure comprises: A plurality of guide pillars, wherein the cross-sectional shape of the guide pillars is any polygonal or curved shape, and the curved shape includes a circle, an ellipse, a wing or a fish shape.

8. The heat exchanger according to claim 7, characterized in that The cross-sectional dimensions of the plurality of flow guiding pillars on one side close to the heat exchange group are smaller than the cross-sectional dimensions of the plurality of flow guiding pillars on the other side, and the cross-sectional dimensions increase in a step-like manner; and / or The distance between two adjacent flow guide pillars on one side close to the heat exchange group is smaller than the distance between two adjacent flow guide pillars on the other side, and the distance increases in a step-like manner.

9. The heat exchanger according to claim 1, characterized in that: A plurality of working medium flow channels are formed in the hot working medium heat exchange plate and the cold working medium heat exchange plate; In the case where there are multiple heat exchange groups, the multiple heat exchange groups are stacked in sequence in the heat exchange cavity; For any target pipe among the hot working medium input pipe, the hot working medium output pipe, the cold working medium input pipe and the cold working medium output pipe, the connection between the heat exchange shell and the target pipe is an arc structure, and the target pipe and the heat exchange group form a preset angle.

10. A heat transfer device in a thermal system, characterized in that: The invention comprises a printed circuit board heat exchanger as claimed in any one of claims 1 to 9.

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