A plate-type microchannel heat exchanger core

Abstract

The present invention relates to the technical field of aero-engine heat exchangers and provides a plate-type microchannel heat exchanger core (1), comprising: a cover plate (12) in an arc shape; a plurality of heat exchange fins (11) attached to the cover plate (12) and evenly distributed along the circumference of the arc of the cover plate (12), each heat exchange fin (11) being provided with a flow channel for a heat exchange medium to flow through; an inlet header (13) provided on a side of the cover plate (12) facing away from the heat exchange fins (11), a cavity provided in the inlet header (13) being in fluid communication with the flow channel in the heat exchange fins (11); and an outlet header (14) provided on a side of the cover plate (12) facing away from the heat exchange fins (11), a cavity provided in the outlet header (14) being in fluid communication with the flow channel in the heat exchange fins (11). The plate-type microchannel heat exchanger core structure of the present invention is simple, and the heat exchange fins are rectangular plate structures, so that the flow channel resistance is kept at a low level. The overall structure of the heat exchanger core is stable, and the pressure resistance and vibration resistance are excellent.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine heat exchangers, and in particular to a plate-type micro-channel heat exchanger core, in particular to a low-resistance plate-type micro-channel heat exchanger core. Background Art

[0002] Heat exchangers, devices used to transfer heat between hot and cold fluids, are widely used in the chemical, transportation, energy, and electronics industries. In the aviation sector, in particular, the continuous increase in thrust-to-weight ratios and turbine inlet temperatures of aircraft engines has led to higher demands for energy efficiency. As a key component in energy exchange, heat exchangers are crucial to aircraft engines. Currently, aircraft engine heat exchangers suffer from shortcomings such as complex structure, difficult installation, high pressure differential resistance, and high resistance, which impact engine performance and the development of the aviation industry.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The object of the present invention is to at least partially overcome the defects of the prior art and provide a plate type microchannel heat exchanger core.

[0005] Another object of the present invention is to provide a plate-type microchannel heat exchanger core that can effectively reduce flow channel resistance.

[0006] Another object of the present invention is to provide a plate-type microchannel heat exchanger core with improved pressure resistance and vibration resistance, which effectively prevents the vibration excitation environment of the aircraft engine from damaging the heat exchanger structure.

[0007] To achieve the above purpose or one of the purposes, the technical solutions of the present invention are as follows:

[0008] A plate-type microchannel heat exchanger core, the heat exchanger core comprising:

[0009] Cover plate, curved;

[0010] A plurality of heat exchange fins are attached to the cover plate and evenly distributed along the arc-shaped circumference of the cover plate, and a flow channel is provided in each heat exchange fin for the heat exchange medium to flow through;

[0011] an inlet header, disposed on a side of the cover plate facing away from the heat exchange fins, wherein a cavity is disposed in the inlet header and is in fluid communication with a flow channel in the heat exchange fins; and

[0012] The outlet header is arranged on a side of the cover plate away from the heat exchange plate. A cavity is arranged in the outlet header and is in fluid communication with the flow channel in the heat exchange plate.

[0013] According to a preferred embodiment of the present invention, the inlet header and the outlet header are both arc-shaped and respectively arranged near two opposite sides of the cover plate, and the circumference of the inlet header and the outlet header is perpendicular to the heat exchange fins.

[0014] According to a preferred embodiment of the present invention, the heat exchange fin includes a heat exchange fin inlet and a heat exchange fin outlet, and the heat exchange fin inlet and the heat exchange fin outlet are in fluid communication with the flow channel.

[0015] According to a preferred embodiment of the present invention, the cover plate is provided with two rows of parallel notch groups, each row of notch groups including a plurality of parallel notches;

[0016] Each heat exchange fin is U-shaped, and both ends of the U-shaped heat exchange fin serve as a heat exchange fin inlet and a heat exchange fin outlet and are respectively inserted into the notches of the two rows of notch groups.

[0017] According to a preferred embodiment of the present invention, the inlet header and the outlet header are respectively covered on two groups of slot groups.

[0018] According to a preferred embodiment of the present invention, the flow channel includes a plurality of microchannels, each microchannel includes two vertical microchannels and a horizontal microchannel connecting the two vertical microchannels;

[0019] The heat exchange fin inlet and the heat exchange fin outlet are respectively communicated with a vertical microchannel.

[0020] According to a preferred embodiment of the present invention, the heat exchange plate contains a local confluence cavity, which is connected to multiple microchannels, so that the heat exchange medium is collected and redistributed at the local confluence cavity and continues to flow into the downstream microchannels.

[0021] According to a preferred embodiment of the present invention, both ends of the heat exchange plate along the axial direction of the arc-shaped cover plate respectively have sharp corner structures.

[0022] According to a preferred embodiment of the present invention, the thickness of the heat exchange fin is 1.2-2.2 mm, and the wall thickness is 0.3-0.5 mm.

[0023] According to a preferred embodiment of the present invention, pipe joints are provided on the mutually facing surfaces of the inlet header and the outlet header for connecting to a heat exchange medium supply pipeline or a heat exchange medium recovery pipeline.

[0024] The heat exchanger core structure of the present invention is simple, facilitating the modular design of a full-loop heat exchanger. The heat exchange fins are inserted vertically into the cover plate, with the heat exchange fin inlet and outlet both located on the outer surface of the cover plate. This structural form facilitates the installation of the heat exchanger core into the flow channel to be exchanged for heat, such as the engine outer duct, from one side, and enables the arrangement of other accessories of the outer duct on one side. The heat exchange fins are rectangular plate structures with a relatively small thickness, which effectively reduces the resistance of the flow channel to be exchanged for heat. The heat exchange fins are evenly distributed vertically, ensuring the stability of the overall structure of the heat exchanger core and effectively preventing damage to the heat exchanger structure caused by high-intensity vibration excitation within the engine. Multiple microchannels and multiple confluence cavities are provided within the heat exchange fins to increase the coverage area of ​​the heat exchange medium, effectively improving the heat exchange effect of the heat exchange medium under laminar flow conditions, while maintaining a low level of flow resistance. The plate-type microchannel heat exchanger core of the present invention has low flow resistance, light weight, good structural bearing effect, and is easy to process, produce, and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a modular detachable outer heat exchanger assembly according to an embodiment of the present invention;

[0026] Figure 2 The assembly process of inserting the heat exchanger core into the outer casing is schematically shown;

[0027] Figure 3 The diagram schematically shows that a plurality of heat exchanger cores are distributed along the circumference of the outer casing in a full ring;

[0028] Figure 4 Schematically illustrates the assembly of segmented supply and recovery lines of a modular, detachable external heat exchanger assembly according to an embodiment of the present invention;

[0029] Figure 5 A perspective view of a plate-type microchannel heat exchanger core according to an embodiment of the present invention;

[0030] Figure 6 A front view of a plate-type microchannel heat exchanger core according to an embodiment of the present invention;

[0031] Figure 7 Schematic diagram of the structure of the cover plate of the plate microchannel heat exchanger core according to an embodiment of the present invention;

[0032] Figure 8 Schematic diagram of the three-dimensional structure of the inlet header of the plate microchannel heat exchanger core according to an embodiment of the present invention;

[0033] Figure 9 Schematic diagram of the structure of the heat exchange fins of the plate microchannel heat exchanger core according to an embodiment of the present invention;

[0034] Figure 10The microchannel structure inside the heat exchange fin and the shapes of the leading and trailing edges of the heat exchange fin are schematically shown. DETAILED DESCRIPTION

[0035] Below in conjunction with the accompanying drawings, exemplary embodiments of the present invention are described in detail, wherein the same or similar reference numerals represent the same or similar elements. In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments may also be implemented without these specific details. In other cases, known structures and devices are embodied in a schematic manner to simplify the drawings.

[0036] Refer to the following Figure 1-4 The present invention describes a modular, detachable, outer duct heat exchanger assembly, which includes an outer casing 2, an inner casing 3, several heat exchanger cores 1, a supply line 4, a recovery line 5, a connecting branch 6, a pipe clamp 9, a bypass valve 8, and the like. The outer casing 2 is annular, with multiple grooves disposed on its surface and along its circumference to accommodate the heat exchanger cores 1. The inner casing 3 is coaxially sleeved within the outer casing 2, with the spacing between the two being consistent, forming an outer duct between the outer casing 2 and the inner casing 3. Both the inner and outer casings can be constructed of high-strength, high-temperature-resistant, lightweight metal alloys. The present invention forms a heat exchanger core 1 through a modular design, which has flow channels disposed therein. The heat exchanger core is vertically inserted into the grooves on the outer casing surface, i.e., multiple heat exchanger cores 1 are disposed in the grooves in a one-to-one correspondence with the multiple grooves. The fluid in the outer duct exchanges heat with the heat exchange medium in the flow channels of the heat exchanger core. The heat exchanger core 1 is designed to be modular, with a uniform configuration as much as possible. The structure of the heat exchanger core 1 will be described in detail later. The structure and number of the heat exchanger cores are adjustable, and can be adjusted based on heat transfer and flow resistance performance requirements, as well as the obstruction of the outer duct space by other accessories within the outer duct. By minimizing the uniformity of the heat exchanger core configuration and reducing the number of heat exchanger core types, a modular design of the heat exchanger core is achieved, simplifying the processing and installation of the outer duct heat exchanger.

[0037] As shown in the figure, each heat exchanger core 1 includes a plurality of heat exchange fins 11, which extend into the outer duct and are arranged so that the heat exchange fins 11 are parallel to the flow direction of the fluid in the outer duct. The heat exchanger core 1 constitutes an independent module and is installed in a manner of being inserted into the groove perpendicular to the outer peripheral surface of the outer casing 2. The heat exchanger core 1 is fixed to the outer casing 2 by rivets and / or bolts. Specifically, rivet / bolt holes are opened on the wall of the outer casing 2. The heat exchanger core 1 and the outer casing 2 can also be fixed by other mechanical connection methods. Through this mechanical connection, the heat exchanger core is detachable and easy to maintain. In addition, local reinforcement ribs can be added to the wall of the outer casing 2 near the groove to increase the strength of the outer casing.

[0038] The heat exchanger core 1 adopts modular design, such as Figure 2 As shown, the heat exchanger core structure and number within the full annular space are adjusted based on heat transfer and flow resistance performance requirements, enabling flexible placement within the annular space. Heat exchanger core 1 is vertically inserted into the slots of outer casing 2 and positioned within the outer duct space. Flow channels are provided within heat exchanger core 1 to facilitate heat exchange between the fluid within the outer duct and the heat transfer medium within the channels, meeting the cooling requirements of high-temperature working fluids in aircraft engines. The heat exchanger core 1 is constructed from a metal alloy material selected based on strength and weight requirements.

[0039] The outer heat exchanger assembly further includes a supply line 4, a recovery line 5, a connecting branch 6, a pipe clamp 7, and a bypass valve 8. The supply line 4 is directly or indirectly connected to the heat exchanger core 1 for supplying heat exchange medium to the heat exchanger core 1. The recovery line 5 is directly or indirectly connected to the heat exchanger core 1 for recovering heat exchange medium from the heat exchanger core 1. The connecting branch 6 is used to connect the supply line 4 and the heat exchanger core 1, or to connect the recovery line 5 and the heat exchanger core 1.

[0040] Preferably, the supply line 4 and the recovery line 5 are respectively annular in structure and arranged on the outside of the outer surface of the outer casing 2. Straight-through joints are arranged in the circumferential direction to achieve connection and disassembly, and the supply line 4 and the recovery line 5 are fixed by a pipe clamp 7. Furthermore, the supply line 4 and the recovery line 5 are respectively provided with a three-way joint for connecting the connecting branch 6 to achieve the transportation of the heat exchange medium in the supply line 4, the recovery line 5 and the heat exchanger core 1. Furthermore, the supply line and the recovery line are fixed to the outer wall of the outer casing by a pipe clamp. Considering the space limitation, the outer surface of the heat exchanger core and the mounting edge of the outer casing can be used to achieve the positioning of the pipe clamp. The supply line 4 (recovery line 5) is fixed to the outer surface of the outer casing 2 by a pipe clamp 7. According to the space limitation and the position of the pipeline, the mounting edge of the outer casing 2 and the outer surface of the heat exchanger core 1 can be used to achieve the fixation of the pipe clamp 7. The pipe clamp 7 is fastened to the pipeline by bolts, which is convenient for installation and disassembly. The skeleton of the pipe clamp 7 is made of metal alloy material, and a buffer layer is provided between the skeleton and the pipeline. Rubber or other composite materials can be selected according to the use temperature and wear resistance requirements.

[0041] Advantageously, the supply pipeline 4 is arranged in sections along the circumference, and the sectioned supply pipelines 4 are connected to form a ring pipeline through straight joints; and the recovery pipeline 5 is arranged in sections along the circumference, and the sectioned recovery pipelines 5 are connected to form a ring pipeline through straight joints. The pipeline position can be flexibly adjusted according to the space limitation of the outer wall of the outer casing 2. Figure 4 As shown, the supply line 4 and the recovery line 5 are connected circumferentially with straight-through connectors, evenly dividing the annular pipe into three sections. This facilitates installation and removal of the annular pipe from the outer wall of the outer casing 2. A main oil inlet (return) port is located on the supply line 4 (and recovery line 5). Its position can be flexibly adjusted based on factors such as flow distribution, tank location, and ease of connection, to accommodate various layout scenarios.

[0042] Advantageously, a bypass valve 8 is provided, disposed between the supply line 4 and the recovery line 5, and configured to close when the heat exchanger core 1 is operating normally, and to open when the heat exchanger core 1 is clogged. The bypass valve 8 is connected to the supply line and the recovery line to ensure that, when the heat exchanger core is clogged, the heat exchange medium can still flow out of the outer heat exchanger through the bypass valve, from the oil inlet interface to the oil return interface (the heat exchange medium is heat exchange oil), and directly supply other accessories. The bypass valve 8 is connected via pipes and joints, and its position can be flexibly arranged according to the space on the outer surface of the outer casing. When the outer heat exchanger is operating normally, the bypass valve 8 is closed, and the heat exchange medium flows through the flow channel inside the heat exchanger core 1 through the pipeline; when the heat exchanger core 1 is blocked and the pressure difference between the inlet and outlet of the heat exchange medium reaches the set pressure value of the bypass valve, the bypass valve opens, and the heat exchange medium flows out through the bypass valve channel to normally supply other engine accessories and ensure the normal operation of the aircraft engine.

[0043] According to a preferred embodiment of the present invention, at least two of the plurality of heat exchanger cores 1 have different sizes; and the plurality of heat exchanger cores 1 are not evenly and / or equidistantly distributed along the circumference of the outer casing 2, such as Figure 3 As shown, it is adapted to the spatial layout of accessories inside and outside the outer duct.

[0044] Aiming to ensure easy maintenance and disassembly of aircraft engine outer casing heat exchangers, the present invention proposes a modular, detachable outer casing heat exchanger assembly structure. Following the modular design principle, the independent heat exchanger core is designed to facilitate its processing and assembly with the outer casing. The heat exchanger core and heat exchange medium pipelines are both mechanically secured to the outer casing, making the outer casing heat exchanger removable and providing improved maintainability. Furthermore, the modular, detachable outer casing heat exchanger assembly of the present invention is equipped with a bypass valve branch to ensure the normal transportation of the heat exchange medium.

[0045] The external heat exchanger assembly structure of the present invention is highly disassembled and easy to maintain. The modular design of the heat exchanger core and pipelines greatly simplifies the heat exchanger design, processing and assembly process, thereby meeting the aviation field's requirements for safety, reliability, efficiency and economy.

[0046] The heat exchanger core of the outer casing heat exchanger assembly of this invention utilizes a modular design, taking into account the space constraints of the outer casing and the required heat transfer resistance. This design minimizes the heat exchanger core structure and simplifies the design, processing, and installation of the outer casing heat exchanger. The heat exchanger core is inserted vertically from the outer casing surface. Both the heat exchanger core and external piping are mechanically secured to the outer casing surface, making the outer casing heat exchanger highly removable and easily maintainable, meeting the aviation industry's growing demands for safety, reliability, and efficiency.

[0047] Figure 5-10The plate microchannel heat exchanger core 1 is shown in detail. The heat exchanger core 1 includes a plurality of heat exchange fins 11, a cover plate 12, an inlet header 13, and an outlet header 14. The cover plate 12 is curved to match the shape of the outer wall of the outer duct; a plurality of heat exchange fins 11 are attached to the cover plate 12 and evenly distributed along the circumference of the arc of the cover plate 12. Each heat exchange fin 11 is provided with a flow channel for the heat exchange medium to flow through; the inlet header 13 is provided on the side of the cover plate 12 facing away from the heat exchange fins 11, and the inlet header 13 is provided with a cavity that is in fluid communication with the flow channel in the heat exchange fins 11; the outlet header 14 is provided on the side of the cover plate 12 facing away from the heat exchange fins 11, and the outlet header 14 is provided with a cavity that is in fluid communication with the flow channel in the heat exchange fins 11. The inlet and outlet headers 13, 14 are both arc-shaped and located near two opposing sides of the cover plate 12. The circumferential directions of the inlet and outlet headers 13, 14 are perpendicular to the heat exchange fins 11. The inlet and outlet headers 13, 14 are connected to the heat exchange fin inlet 101 and the heat exchange fin outlet 102, respectively.

[0048] The inlet header 13 and the outlet header 14 are provided with pipe joints 15 on the surfaces facing each other, for connecting with the heat exchange medium supply pipeline 4 or the heat exchange medium recovery pipeline 5. Figure 8 The inlet manifold 13 is rectangular and has an internal cavity, forming a manifold fluid domain. Several heat exchanger fin inlets 101 form the manifold coverage area. The inlet manifold 13 is located on the outer surface of the cover plate 12 and connected by welding. One end of the pipe joint is connected to the inlet manifold 13, and the other end is connected to the external fluid pipeline through a mechanical connection. The outlet manifold 14 is arranged in the same manner as the inlet manifold 13.

[0049] The heat exchanger 11 includes a heat exchanger inlet 101 and a heat exchanger outlet 102, which are in fluid communication with the flow channel. The cover plate 12 is provided with two parallel rows of slot groups, each of which includes multiple parallel slots. Each heat exchanger 11 is U-shaped, with the ends of the U-shaped heat exchanger 11 serving as the heat exchanger inlet 101 and heat exchanger outlet 102, respectively, inserted into the slots of the two rows of slot groups. The inlet and outlet headers 13 and 14 respectively cover the two slot groups. The heat exchanger inlet 101 and the heat exchanger outlet 102 are located on the same side of the heat exchanger 11.

[0050] The cover plate 12 has a through groove at the junction with the heat exchanger. The heat exchanger 11 is inserted vertically into the groove on the surface of the cover plate 12 from the inner diameter direction of the cover plate 12 and connected to the cover plate 12 by brazing. The heat exchanger inlet 101 and the heat exchanger outlet 102 are 1.5-2mm higher than the outer diameter of the cover plate 12, preventing solder from entering the channel inside the heat exchanger 11 and causing blockage while also avoiding large local resistance to the inlet and outlet. Figure 6The heat exchange fins 11 are evenly arranged on the circumferential width of the cover plate 12, and the spacing is adjusted according to the heat exchange and flow resistance requirements.

[0051] Advantageously, the flow channel includes multiple microchannels, each of which includes two vertical microchannels 103 and a horizontal microchannel 104 connecting the two vertical microchannels 103. The heat exchange fin inlet 101 and the heat exchange fin outlet 102 are each connected to a vertical microchannel 103. In this way, the flow direction of the heat exchange medium in the heat exchange fin 11 is changed.

[0052] Preferably, the heat exchange fin 11 includes a local confluence cavity 105, which is connected to multiple microchannels. This allows the heat exchange medium to be collected and redistributed at the local confluence cavity 105 and continue to flow into the downstream microchannel. There are multiple local confluence cavities 105, which are arranged along the microchannel.

[0053] The heat exchange medium enters the heat exchanger 11 through the heat exchanger inlet 101, passes through the vertical microchannel 103, the horizontal microchannel 104, and finally reaches the heat exchanger outlet 102. The entire flow path forms the heat exchanger fluid domain. The contact points between the vertical microchannel 103 / horizontal microchannel 104 and the local confluence cavity 105 are rounded to reduce local resistance.

[0054] The fluid working medium in the outer duct passes through the outer wall of the heat exchange plate 11, and the positions of the flow channel inlet and the flow channel outlet can be interchanged to achieve the relative flow direction change between the heat exchange working medium and the fluid working medium in the outer duct. The specific flow direction can be flexibly adjusted according to different heat exchange requirements.

[0055] The microchannel structure in the heat exchange plate 11 can be further adjusted according to needs, such as being adjusted to an S-shaped or tree-shaped microchannel, etc. In addition, it can also be set in the form of a spoiler column to form a discontinuous microchannel structure.

[0056] According to a preferred embodiment of the present invention, the two ends (windward side and leeward side) of the arc-shaped cover plate 12 along the axial direction of the heat exchange plate 11 respectively have sharp corner structures, such as Figure 10 As shown, a drag-reducing structure is formed to reduce resistance within the outer duct. While ensuring the strength and pressure resistance of the heat exchange fins 11, the front and rear drag-reducing structures can be adjusted, such as setting a swept-back structure to reduce flow separation and thus reduce resistance. In addition, the heat exchange and flow resistance characteristics can be modified by processing ribs and other special-shaped structures on the outer wall of the heat exchange fins 11 to meet more application requirements.

[0057] According to a preferred embodiment of the present invention, the thickness of the heat exchange fin 11 is 1.2-2.2 mm, and the wall thickness is 0.3-0.5 mm, so as to achieve a smaller weight while ensuring the strength and pressure resistance of the heat exchange fin 11 .

[0058] The heat exchanger core structure of the present invention is simple, facilitating the modular design of a full-loop heat exchanger. The heat exchange fins are inserted vertically into the cover plate, with the heat exchange fin inlet and outlet both located on the outer surface of the cover plate. This structural form facilitates the installation of the heat exchanger core into the flow channel to be exchanged for heat, such as the engine outer duct, from one side, and enables the arrangement of other accessories of the outer duct on one side. The heat exchange fins are rectangular plate structures with a relatively small thickness, which effectively reduces the resistance of the flow channel to be exchanged for heat. The heat exchange fins are evenly distributed vertically, ensuring the stability of the overall structure of the heat exchanger core and effectively preventing damage to the heat exchanger structure caused by high-intensity vibration excitation within the engine. Multiple microchannels and multiple confluence cavities are provided within the heat exchange fins to increase the coverage area of ​​the heat exchange medium, effectively improving the heat exchange effect of the heat exchange medium under laminar flow conditions, while maintaining a low level of flow resistance. The plate-type microchannel heat exchanger core of the present invention has low flow resistance, light weight, good structural bearing effect, and is easy to process, produce, and install.

[0059] The heat exchanger core of the present invention, composed of heat exchange fins 11, cover plates 12, and headers, features a simple and easy-to-manufacture structure, and the components are flexible and adjustable to meet diverse needs. The heat exchanger core is vertically inserted into the duct from the outer wall and connected to the duct's outer wall, achieving a modular design for the full-loop heat exchanger and facilitating heat exchanger design, processing, and installation.

[0060] The heat exchanger fins utilize a rectangular plate structure with a small thickness and adjustable spacing, which keeps the flow resistance within the outer duct low. The modular design allows for the number of fins in the heat exchanger core to be adjusted based on heat transfer and flow resistance requirements, as well as outer duct space limitations.

[0061] The heat exchange fins 11 of the present invention are rectangular plates with sharp corners on the front and back surfaces, effectively reducing resistance within the outer duct. Furthermore, the plate structure offers excellent pressure and vibration resistance, capable of withstanding the high-intensity vibration excitation environment within aircraft engines. Multiple microchannels are incorporated within the heat exchange fins 11, fully covering the internal space, increasing the heat transfer area for the working fluid and enhancing the heat transfer effect.

[0062] The inner cavity of the manifold and the microchannels within the heat exchange fins together form the heat exchange flow path. The manifold is connected to the outside world via pipe joints on its sidewalls, and the inlet and outlet of the heat exchange fins are connected to the manifold. When the heat exchanger core is operating, the heat exchange medium enters the cavity inside the manifold through the joints on the manifold, where it is collected and then flows into the microchannels within the heat exchange fins and exits through another manifold. Because the manifold has a relatively large flow area, it has a certain buffering effect on the heat exchange medium, which can be distributed more evenly among the heat exchange fins, thereby improving the heat exchange efficiency.

[0063] Furthermore, the cover plate is arc-shaped and can be connected to the outer wall of the duct, enabling modular installation of the heat exchanger core. The cover plate is provided with several through-channels, into which the heat exchange fins are vertically inserted. The inlet / outlet manifolds are placed over the circumferential channels on the cover plate. The manifold cavity communicates with the microchannels of the heat exchange fins through the grooves on the cover plate surface. A single manifold can deliver heat exchange medium to multiple heat exchange fins.

[0064] Furthermore, the windward and leeward surfaces of the heat exchanger fins are shaped to create sharp angles, further reducing flow resistance. The fins are 1.2-2.2mm thick to minimize obstruction of the duct and reduce resistance. Meanwhile, the wall thickness is 0.3-0.5mm, ensuring fin strength and pressure resistance while reducing the overall weight of the heat exchanger core.

[0065] Furthermore, the heat exchanger fin contains multiple microchannels, including vertical microchannels and horizontal microchannels, to achieve the transportation of heat exchange medium from the heat exchanger fin inlet to the heat exchanger fin outlet. The heat exchanger fin inlet and outlet are arranged on the same side, which can realize that the interfaces are all located on the same side of the cover plate, so that the heat exchanger core can be installed into the outer duct space from one direction, which is convenient for the installation of the heat exchanger core. The internal channel of the heat exchanger fin contains multiple oblique confluence cavities, which can avoid the blockage of heat exchange medium in long channels. At the same time, the heat exchange medium is mixed once after flowing through a certain distance, ensuring that the internal flow field is more uniform. The sharp corners of the solid wall of the channel in the heat exchanger fin are chamfered to avoid excessive local resistance.

[0066] Furthermore, fins and other extensions can be added to the outer surface of the heat exchanger to enhance the heat transfer effect on the working medium side of the outer duct. The heat exchanger's shape can also be modified, such as with a swept back shape, to reduce flow separation and thus further reduce resistance. Furthermore, the channel structure within the heat exchanger can be further adjusted, such as by adding spoiler columns, tree-like channels, or S-shaped channels, to achieve better heat transfer and flow resistance characteristics.

[0067] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes can be made to these embodiments without departing from the principles and spirit of the invention. The scope of application of the present invention is defined by the following claims and their equivalents.

[0068] List of reference numerals:

[0069] 1. Heat exchanger core

[0070] 2. Outer Receiver

[0071] 3. Inner receiver

[0072] 4. Supply pipeline

[0073] 5. Recovery pipeline

[0074] 6. Connect branch pipes

[0075] 7. Pipe clamp

[0076] 8. Bypass valve

[0077] 11. Heat exchanger

[0078] 12. Cover

[0079] 13. Inlet header

[0080] 14. Export header

[0081] 15. Pipe joints

[0082] 101. Import of heat exchanger

[0083] 102. Heat exchanger outlet

[0084] 103. Vertical Microchannel

[0085] 104. Horizontal Microchannel

[0086] 105. Local confluence cavity.

Claims

1. A detachable outer casing heat exchanger assembly, comprising an outer casing (2), an inner casing (3), and a plurality of plate-type microchannel heat exchanger cores (1), characterized in that: The outer casing (2) is annular, and a plurality of grooves are provided on the surface of the outer casing (2) and along the circumference of the outer casing (2) to match the heat exchanger core (1). The inner casing (3) is coaxially sleeved in the outer casing (2), and the spacing between the two is kept consistent. An outer duct is formed between the outer casing (2) and the inner casing (3). The heat exchanger core (1) includes: a cover plate (12) in an arc shape; A plurality of heat exchange fins (11) are attached to the cover plate (12) and are evenly distributed along the arc-shaped circumference of the cover plate (12), and a flow channel is provided in each heat exchange fin (11) for a heat exchange medium to flow through; An inlet header (13) is provided on a side of the cover plate (12) facing away from the heat exchange fins (11), wherein a cavity is provided in the inlet header (13) and is in fluid communication with a flow channel in the heat exchange fins (11); and The outlet header (14) is arranged on the side of the cover plate (12) away from the heat exchange plate (11), and a cavity is arranged in the outlet header (14) and is in fluid communication with the flow channel in the heat exchange plate (11). The heat exchanger core is vertically inserted into the groove on the surface of the outer casing, and the plurality of heat exchanger cores (1) are arranged in the groove in a one-to-one correspondence with the plurality of grooves; at least two of the plurality of heat exchanger cores (1) have different sizes; and the plurality of heat exchanger cores (1) are not uniformly and / or equidistantly distributed along the circumference of the outer casing (2).

2. The detachable outer heat exchanger assembly according to claim 1, characterized in that: The inlet header (13) and the outlet header (14) are both arc-shaped and are respectively arranged at positions close to two opposite sides of the cover plate (12), and the circumferential directions of the inlet header (13) and the outlet header (14) are perpendicular to the heat exchange fins (11).

3. The detachable outer heat exchanger assembly according to claim 2, characterized in that: The heat exchange fin (11) comprises a heat exchange fin inlet (101) and a heat exchange fin outlet (102), and the heat exchange fin inlet (101) and the heat exchange fin outlet (102) are in fluid communication with the flow channel.

4. The detachable outer heat exchanger assembly according to claim 3, characterized in that: The cover plate (12) is provided with two rows of parallel notch groups, each row of notch groups including a plurality of parallel notches; Each heat exchange fin (11) is U-shaped, and two ends of the U-shaped heat exchange fin (11) serve as a heat exchange fin inlet (101) and a heat exchange fin outlet (102) and are respectively inserted into the notches of the two rows of notch groups.

5. The detachable outer heat exchanger assembly according to claim 4, characterized in that: The inlet header (13) and the outlet header (14) are respectively covered on the two groups of slot groups.

6. The detachable outer heat exchanger assembly according to claim 5, characterized in that: The flow channel includes a plurality of microchannels, each microchannel includes two vertical microchannels (103) and a horizontal microchannel (104) connecting the two vertical microchannels (103); The heat exchange fin inlet (101) and the heat exchange fin outlet (102) are each connected to a vertical microchannel (103).

7. The detachable outer heat exchanger assembly according to claim 6, characterized in that: The heat exchange plate (11) comprises a local confluence cavity (105) therein, and the local confluence cavity (105) is connected to a plurality of microchannels, so that the heat exchange medium is collected and redistributed at the local confluence cavity (105) and continues to flow into the downstream microchannels.

8. The detachable outer heat exchanger assembly according to claim 7, characterized in that: Both ends of the heat exchange plate (11) along the axial direction of the arc-shaped cover plate (12) respectively have a pointed structure.

9. The detachable outer heat exchanger assembly according to any one of claims 1 to 8, characterized in that: The thickness of the heat exchange fin (11) is 1.2-2.2 mm, and the wall thickness is 0.3-0.5 mm.

10. The detachable outer heat exchanger assembly according to any one of claims 1 to 8, characterized in that: Pipe joints are provided on the mutually facing surfaces of the inlet header (13) and the outlet header (14) for connecting to a heat exchange medium supply pipeline (4) or a heat exchange medium recovery pipeline (5).

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