Plate type micro-channel heat exchanger core

Abstract

The invention relates to the technical field of aero-engine heat exchangers, and provides a plate-type micro-channel heat exchanger core (1) which comprises an arc-shaped cover plate (12) and a plurality of micro-channel heat exchangers (13). The multiple heat exchange sheets (11) are attached to the cover plate (12) and evenly distributed in the arc-shaped circumferential direction of the cover plate (12), and a flow channel is formed in each heat exchange sheet (11) and used for allowing a heat exchange working medium to flow through; the inlet collecting pipe (13) is arranged on the side, deviating from the heat exchange pieces (11), of the cover plate (12), and a cavity is formed in the inlet collecting pipe (13) and is in fluid communication with the flow channels in the heat exchange pieces (11); and the outlet collecting pipe (14) is arranged on the side, away from the heat exchange pieces (11), of the cover plate (12), and a cavity is formed in the outlet collecting pipe (14) and is in fluid communication with the flow channels in the heat exchange pieces (11). The plate type micro-channel heat exchanger core body is simple in structure, the heat exchange pieces are of a rectangular plate type structure, the flow channel resistance is kept at a low level, and the heat exchanger core body is stable in overall structure and excellent in pressure resistance and vibration resistance.

Description

Technical Field

[0001] The 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 are devices used for heat exchange between hot and cold fluids. They are widely used in chemical, transportation, energy and power, electronic products and other fields. Especially in the aviation field, with the continuous improvement of the thrust-to-weight ratio of aircraft engines and the temperature before the turbine, higher requirements are put forward for the energy utilization efficiency of the system. As a key component of energy exchange, heat exchangers are crucial for aircraft engines. At present, aircraft engine heat exchangers have the disadvantages of complex structure, difficult installation, pressure difference resistance, and large resistance, which affect the 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] The present invention also aims to provide a plate-type microchannel heat exchanger core having 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 solution of the present invention is 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 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 is arranged on a side of the cover plate away from the heat exchange fins, wherein a cavity is arranged 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 comprises 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, two rows of parallel slot groups are provided on the cover plate, and each row of slot groups includes a plurality of parallel slots;

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

[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 comprises a local confluence cavity inside, and the local confluence cavity 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, two 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 plate 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 with 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, which is convenient for the modular design of the full-ring heat exchanger. The heat exchanger fins are vertically inserted into the cover plate, and the heat exchanger fin inlet and heat exchanger fin outlet are both located on the outer surface of the cover plate. This structural form facilitates the heat exchanger core to be loaded into the flow channel to be exchanged from one side, such as the engine outer duct, and realizes the arrangement of other accessories of the outer duct on one side. The heat exchanger fins are rectangular plate structures with a small thickness, which effectively reduces the resistance of the flow channel to be exchanged. The heat exchanger fins are evenly distributed vertically to ensure the stability of the overall structure of the heat exchanger core, and can effectively prevent the damage to the heat exchanger structure caused by high-intensity vibration excitation in the engine. Multiple microchannels and multiple confluence cavities are provided in the heat exchanger fins to increase the coverage area of ​​the heat exchange medium, effectively improve the heat exchange effect of the heat exchange medium under laminar flow conditions, and maintain a low flow resistance level. 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 and produce and install the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a modularized detachable external 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 in a full ring along the circumference of the outer casing;

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

[0029] Figure 5 A three-dimensional diagram 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 It is a structural schematic diagram of a cover plate of a plate type microchannel heat exchanger core according to an embodiment of the present invention;

[0032] Figure 8 It is a 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] Fig. 9 It is a schematic structural diagram of a heat exchanger fin of a plate-type microchannel heat exchanger core according to an embodiment of the present invention;

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

[0035] Exemplary embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, 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 accompanying drawings.

[0036] Refer to the following Figure 1-4 The modular detachable outer duct heat exchanger assembly of the present invention is described, and the outer duct heat exchanger assembly includes an outer casing 2, an inner casing 3, a plurality of heat exchanger cores 1, a supply pipeline 4, a recovery pipeline 5, a connecting branch pipe 6, a pipe clamp 9, a bypass valve 8, etc. The outer casing 2 is annular, and a plurality of grooves are arranged 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, and an outer duct is formed between the outer casing 2 and the inner casing 3, and both the inner and outer casings can be made of high-strength, high-temperature-resistant, and lightweight metal alloy materials. The present invention forms a heat exchanger core 1 through modular design, and a flow channel is arranged inside the heat exchanger core, and the heat exchanger core is vertically inserted into the groove on the surface of the outer casing, that is, a plurality of heat exchanger cores 1 and a plurality of grooves are arranged in the groove in a one-to-one correspondence. The fluid working medium in the outer duct exchanges heat with the heat exchange working medium in the flow channel of the heat exchanger core. The heat exchanger core 1 is designed in a modular way, and the configuration is unified as much as possible. The structure of the heat exchanger core 1 will be described in detail later. The structure and quantity of the heat exchanger core are adjustable, and the structure and quantity of the heat exchanger core can be adjusted according to the requirements of heat exchange and flow resistance performance, as well as the shielding of the outer duct space by other accessories in the outer duct. By unifying the configuration of the heat exchanger core as much as possible and reducing the number of types of heat exchanger cores, the modular design of the heat exchanger core is realized, and the processing and installation process of the outer duct heat exchanger is simplified.

[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 a modular design, such as Figure 2 As shown, the structure of the heat exchanger core and the number of heat exchangers in the full ring space are adjusted according to the requirements of heat exchange and flow resistance performance, and flexible arrangement in the full ring space is achieved. The heat exchanger core 1 is vertically inserted into the groove of the outer casing 2 and arranged in the outer duct space. A flow channel is provided in the heat exchanger core 1 to achieve heat exchange between the fluid working medium in the outer duct and the heat exchange working medium in the flow channel, meeting the cooling requirements of the high-temperature working medium of the aircraft engine. The heat exchanger core 1 selects the corresponding metal alloy material according to the strength and weight requirements.

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

[0040] Preferably, the supply pipeline 4 and the recovery pipeline 5 are respectively annular in structure and arranged on the outside of the outer surface of the outer casing 2. A straight joint is arranged in the circumferential direction to achieve connection and disassembly, and the supply pipeline 4 and the recovery pipeline 5 are fixed by a pipe clamp 7. Furthermore, the supply pipeline 4 and the recovery pipeline 5 are respectively provided with a three-way joint for connecting the connecting branch pipe 6 to realize the transportation of the heat exchange medium in the supply pipeline 4, the recovery pipeline 5 and the heat exchanger core 1. Furthermore, the supply pipeline and the recovery pipeline 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 outer casing mounting edge can be used to realize the positioning of the pipe clamp. The supply pipeline 4 (recovery pipeline 5) is fixed to the outer surface of the outer casing 2 by a pipe clamp 7. According to the space limitation and the pipeline position, the outer casing 2 mounting edge and the outer surface of the heat exchanger core 1 can be used to realize the fixing of the pipe clamp 7. The pipe clamp 7 clamps the pipeline by bolts, which is convenient for installation and removal. The frame of the pipe clamp 7 is made of metal alloy material, and a buffer layer is provided between the frame 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. According to the space limitation of the outer wall of the outer casing 2, the pipeline position can be flexibly adjusted. Figure 4 As shown, the supply pipeline 4 and the recovery pipeline 5 are connected with a straight joint in the circumferential direction, and the entire annular pipe is evenly divided into three sections, so as to facilitate the installation and removal of the annular pipeline on the outer wall of the outer casing 2. The supply pipeline 4 (recovery pipeline 5) is arranged with a total oil inlet (return) port, and its position can be flexibly adjusted by comprehensively considering factors such as flow distribution, oil tank position, and connection convenience, so as to be suitable for various layout scenarios.

[0042] Advantageously, a bypass valve 8 is provided, which is arranged between the supply pipeline 4 and the recovery pipeline 5, and is configured such that when the heat exchanger core 1 is working normally, the bypass valve 8 is closed, and when the heat exchanger core 1 is blocked, the bypass valve 8 is opened. The bypass valve 8 is connected to the supply pipeline and the recovery pipeline to ensure that when the heat exchanger core is blocked, the heat exchange medium can still flow out of the outer heat exchanger through the bypass valve, and reach the oil return interface (the heat exchange medium is heat exchange oil) from the oil inlet interface, and directly supply other accessories. The bypass valve 8 is connected through pipelines and joints, and the position of the bypass valve 8 can be flexibly arranged according to the space on the outer surface of the outer casing. When the outer heat exchanger is working 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 is opened, 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 evenly spaced along the circumference of the outer casing 2. Figure 3 As shown, to adapt to the spatial layout of accessories inside and outside the outer duct.

[0044] Aiming at the principle of easy maintenance and disassembly of aircraft engine outer casing heat exchangers, the present invention proposes a modularized detachable outer casing heat exchanger assembly structure. Following the modular design principle, an independent heat exchanger core is designed to facilitate the processing of the heat exchanger core and its assembly with the outer casing. The heat exchanger core and the heat exchange medium pipeline are fixed to the outer casing by mechanical connection, which realizes the disassembly of the outer casing heat exchanger and has good maintainability. At the same time, the modularized detachable outer casing heat exchanger assembly of the present invention is arranged 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 requirements of the aviation field for safety, reliability, efficiency and economy.

[0046] The heat exchanger core of the outer casing heat exchanger assembly of the present invention is modularly designed, comprehensively considering the outer casing installation space limitation and heat exchange flow resistance performance requirements, unifying the heat exchanger core structure as much as possible, and simplifying the outer casing heat exchanger design, processing and installation process. The heat exchanger core is vertically inserted from the outer surface of the outer casing, and the heat exchanger core and external pipelines are fixed to the outer surface of the outer casing by mechanical connection, so that the outer casing heat exchanger has a high degree of detachability and easy maintenance, so as to meet the aviation industry's growing demand for safety, reliability and efficiency.

[0047] Figure 5-10The plate microchannel heat exchanger core 1 is shown in detail, and 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 arc-shaped 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 are evenly distributed along the circumference of the arc of the cover plate 12, and a flow channel is provided in each heat exchange fin 11 for the heat exchange medium to flow through; the inlet header 13 is provided on the side of the cover plate 12 away from the heat exchange fin 11, and a cavity is provided in the inlet header 13, which is in fluid communication with the flow channel in the heat exchange fin 11; the outlet header 14 is provided on the side of the cover plate 12 away from the heat exchange fin 11, and a cavity is provided in the outlet header 14, which is in fluid communication with the flow channel in the heat exchange fin 11. 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. The inlet header 13 and the outlet header 14 are respectively connected to the heat exchange fin inlet 101 and the heat exchange fin outlet 102.

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

[0049] The heat exchanger 11 includes a heat exchanger inlet 101 and a heat exchanger outlet 102, and the heat exchanger inlet 101 and the heat exchanger outlet 102 are in fluid communication with the flow channel. The cover plate 12 is provided with two rows of parallel slot groups, each row of slot groups includes a plurality of parallel slots; each heat exchanger 11 is U-shaped, and the two ends of the U-shaped heat exchanger 11 are inserted into the slots of the two rows of slot groups as the heat exchanger inlet 101 and the heat exchanger outlet 102, respectively. The inlet header 13 and the outlet header 14 cover the two groups of slot groups, respectively. 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 vertically inserted into the groove on the surface of the cover plate 12 from the inner diameter direction of the cover plate 12, and is 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, which prevents solder from entering the channel of the heat exchanger 11 and causing blockage while 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 a plurality of microchannels, each of which includes two vertical microchannels 103 and a horizontal microchannel 104 connecting the two vertical microchannels 103; the heat exchanger fin inlet 101 and the heat exchanger 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 exchanger fin 11 is changed.

[0052] Preferably, the heat exchange plate 11 includes a local confluence cavity 105, which is connected to multiple microchannels, so that the heat exchange medium is collected and redistributed at the local confluence cavity 105 and continues 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 from the heat exchanger inlet 101, passes through the vertical microchannel 103, the horizontal microchannel 104, and the vertical microchannel 103 to reach the heat exchanger outlet 102, and the entire flow channel forms a heat exchanger fluid domain. The contact between the vertical microchannel 103 / horizontal microchannel 104 and the local confluence cavity 105 is rounded to reduce local resistance.

[0054] The fluid 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 medium and the fluid 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., and 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 heat exchange plate 11 along the axial direction of the arc-shaped cover plate 12 respectively have sharp corner structures, such as Fig.10 As shown, a drag reduction structure is formed to reduce the resistance in the outer duct. On the basis of ensuring the strength and pressure resistance of the heat exchanger fins 11, the front and rear drag reduction structures can be adjusted, such as setting a swept structure to reduce flow separation to reduce resistance. In addition, the heat exchange and flow resistance characteristics can also be changed by processing ribs and other special-shaped structures on the outer wall of the heat exchanger fins 11 to meet more application requirements.

[0057] According to a preferred embodiment of the present invention, the thickness of the heat exchanger 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 exchanger fin 11.

[0058] The heat exchanger core structure of the present invention is simple, which is convenient for the modular design of the full-ring heat exchanger. The heat exchanger fins are vertically inserted into the cover plate, and the heat exchanger fin inlet and heat exchanger fin outlet are both located on the outer surface of the cover plate. This structural form facilitates the heat exchanger core to be loaded into the flow channel to be exchanged from one side, such as the engine outer duct, and realizes the arrangement of other accessories of the outer duct on one side. The heat exchanger fins are rectangular plate structures with a small thickness, which effectively reduces the resistance of the flow channel to be exchanged. The heat exchanger fins are evenly distributed vertically to ensure the stability of the overall structure of the heat exchanger core, and can effectively prevent the damage to the heat exchanger structure caused by high-intensity vibration excitation in the engine. Multiple microchannels and multiple confluence cavities are provided in the heat exchanger fins to increase the coverage area of ​​the heat exchange medium, effectively improve the heat exchange effect of the heat exchange medium under laminar flow conditions, and maintain a low flow resistance level. 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 and produce and install the heat exchanger.

[0059] The present invention forms a heat exchanger core body by heat exchanger fins 11, cover plate 12 and header, and has a simple structure and is easy to process, and the structure of each component can be flexibly adjusted to meet various needs. The heat exchanger core body is vertically inserted into the outer duct from the outer wall surface of the outer duct and connected to the outer wall surface of the outer duct, realizing the modular design of the full-loop heat exchanger, which is convenient for heat exchanger design, processing and installation.

[0060] The heat exchanger adopts a rectangular plate structure with a small thickness and adjustable spacing, which can keep the flow resistance in the outer duct at a low level. According to the heat exchange and flow resistance requirements and the space limitation of the outer duct, the number of heat exchanger fins in the heat exchanger core can be adjusted through modular design.

[0061] The heat exchanger 11 of the present invention is a rectangular plate structure, and the front and rear surfaces are provided with sharp corner structures, which can effectively reduce the resistance inside the outer duct. In addition, the plate structure has good pressure resistance and vibration resistance, and can meet the high-intensity vibration excitation environment in the aircraft engine. The heat exchanger 11 is provided with multiple microchannels, which fully cover the space inside the heat exchanger 11, increase the heat exchange area of ​​the heat exchange medium, and enhance the heat exchange effect.

[0062] The inner cavity of the header and the microchannels in the heat exchanger together constitute the heat exchange flow channel. The header is connected to the outside world through the pipe joints on its side walls, and the inlet and outlet of the heat exchanger are connected to the header. When the heat exchanger core is working, the heat exchange medium enters the cavity inside the header through the interface on the header, gathers, and then flows into the microchannels in the heat exchanger and flows out from another header. Because the flow area of ​​the header is relatively large, it has a certain buffering effect on the heat exchange medium, and can distribute the heat exchange medium to several heat exchangers more evenly, thereby improving the heat exchange effect.

[0063] Furthermore, the cover plate is in an arc shape and can be connected to the outer wall of the outer duct to realize modular installation of the heat exchanger core. The cover plate is provided with a plurality of through grooves, the heat exchange fins are vertically inserted into the grooves on the cover plate, and the inlet / outlet headers are covered on the plurality of circumferential grooves on the cover plate. The inner cavity of the header is connected to the microchannels of the heat exchange fins through the grooves on the surface of the cover plate. One header can realize the delivery of heat exchange medium to a plurality of heat exchange fins.

[0064] Furthermore, the windward and leeward surfaces of the heat exchanger are shaped to present a sharp angle structure, which can further reduce the flow resistance. The thickness of the heat exchanger is 1.2-2.2mm to reduce the shielding of the heat exchanger to the external duct and reduce the resistance. At the same time, the wall thickness is 0.3-0.5mm, which ensures the strength and pressure resistance of the heat exchanger and reduces the overall weight of the heat exchanger core.

[0065] Furthermore, the heat exchanger fin contains a plurality of microchannels, including vertical microchannels and horizontal microchannels, to realize the transportation of the 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, so that the interfaces can be located on the same side of the cover plate, so that the heat exchanger core can be loaded 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 the heat exchange medium in the long channel, and at the same time, the heat exchange medium is mixed once after flowing through a certain distance, so as to ensure that the internal flow field is more uniform. The sharp corners of the solid wall of the channel in the heat exchanger fin are rounded to avoid excessive local resistance.

[0066] Furthermore, ribs and other extended structures can be processed on the outer surface of the heat exchanger to enhance the heat exchange effect on the working medium side of the fluid in the outer duct. At the same time, the shape of the heat exchanger can be modified, such as processing it into a swept shape to reduce flow separation, thereby further reducing resistance. In addition, the channel structure inside the heat exchanger can be further adjusted, such as arranging spoiler columns, tree-like channels, S-shaped channels, etc., to achieve better heat exchange 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 may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of application of the present invention is defined by the appended claims and their equivalents.

[0068] List of reference numerals:

[0069] 1. Heat exchanger core

[0070] 2. External 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. Import 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 plate-type microchannel heat exchanger core (1), characterized in that: The heat exchanger core (1) comprises: A cover plate (12) having 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); each heat exchange fin (11) is provided with a flow channel for a heat exchange medium to flow through; An inlet header (13) is arranged on a side of the cover plate (12) away from the heat exchange fins (11), wherein a cavity is arranged 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 a side of the cover plate (12) away from the heat exchange plate (11), and a cavity is arranged inside the outlet header (14) and is in fluid communication with a flow channel in the heat exchange plate (11).

2. The plate type microchannel heat exchanger core (1) 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 plate type microchannel heat exchanger core (1) 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 plate type microchannel heat exchanger core (1) according to claim 3, characterized in that: The cover plate (12) is provided with two rows of parallel slot groups, each row of slot groups comprising a plurality of parallel slots; 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 plate type microchannel heat exchanger core (1) 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 plate type microchannel heat exchanger core (1) according to claim 5, characterized in that: The flow channel includes a plurality of 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).

7. The plate type microchannel heat exchanger core (1) according to claim 6, characterized in that: The heat exchange plate (11) comprises a local confluence cavity (105) inside, 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 plate type microchannel heat exchanger core (1) 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 sharp corner structures.

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

10. The plate microchannel heat exchanger core (1) according to any one of claims 1 to 8, characterized in that: Pipe joints are provided on 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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