Micro-channel heat exchanger

Abstract

The invention relates to the technical field of heat exchange equipment, and discloses a micro-channel heat exchanger which is characterized in that a leakage monitoring cavity is formed between a first micro-channel and a second micro-channel and communicates with an external monitoring interface, so that when a first heat exchange plate or a second heat exchange plate is subjected to penetration or micro-crack leakage, a leakage medium enters the leakage monitoring cavity; therefore, real-time monitoring of leakage is achieved, and the problem of lag caused by the fact that the prior art mainly depends on outlet material component analysis or indirect judgment of system parameters is solved. And the leakage monitoring cavity is communicated with the external monitoring interface through the guide channel, so that high-sensitivity capture and rapid judgment on early-stage micro leakage are realized, the occurrence of safety accidents is reduced, and the stability and safety of the system are improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and more specifically to a microchannel heat exchanger. Background Technology

[0002] Microchannel heat exchangers have been widely used in extreme conditions in energy, chemical, metallurgical, and cryogenic fields due to their compact structure, large heat exchange area per unit volume, resistance to high pressure and high temperature, high heat transfer efficiency, and applicability to multiple media and operating conditions. Especially in high-pressure gas heat exchange, flammable / explosive media heat exchange, corrosive media heat exchange, and high-temperature and high-pressure process systems, microchannel heat exchangers, with their high integration and fully welded sealing characteristics, are gradually replacing traditional shell-and-tube heat exchangers as key equipment.

[0003] The core of existing microchannel heat exchangers is typically composed of multiple layers of stacked plates, including channel plates and side plates. The channel plates form a network of microchannels for the separate flow of cold and hot fluids, and can be fabricated using chemical etching or machining. The side plates are located at both ends of the stack, typically one at the top and one at the bottom. The plates are metallurgically bonded using diffusion welding, brazing, or other methods to form an integral heat exchanger core. This core is then connected to an external piping system via end caps, nozzles, and supports, thus creating a fully welded heat exchanger capable of withstanding high pressure and temperature loads.

[0004] However, while achieving the aforementioned superior performance, microchannel heat exchangers also present significant safety and reliability challenges, namely, the difficulty in early detection and prevention of internal leaks. Unlike traditional shell-and-tube heat exchangers, where leaks occur when the leaking medium enters the lower-pressure side, leaks can be detected and alarmed with a certain probability by monitoring changes in shell-side pressure, discharge liquid characteristics, or changes in medium composition. In microchannel heat exchangers, cold and hot fluids typically flow within their respective microchannels, separated only by a thin metal partition. Once the partition suffers penetrating damage due to corrosion, erosion, manufacturing defects, welding / diffusion bonding defects, or fatigue stress, direct mixing of the two media can occur. Due to the small channel size, high flow velocity, and highly integrated structure, leaks are difficult to detect through external visible signs in their early stages, and leaks can develop rapidly.

[0005] When a leak occurs, the mixing of media can lead to serious consequences. When one side contains a high-pressure flammable and explosive medium and the other side contains a high-temperature medium or oxygen-containing gas, the leak may induce major safety accidents such as fires or explosions. Leakage from the high-pressure side to the low-pressure side may cause overpressure operation on the low-pressure side, leading to downstream equipment failure due to exceeding design pressure or even system paralysis. When one side contains a highly toxic medium, the leak will cause the spread of toxic substances, posing risks of personnel poisoning and environmental pollution. When one side contains high-chloride-ion cooling water and the other side contains high-temperature oil or high-temperature process media, chloride ions entering the high-temperature side may induce failure mechanisms such as stress corrosion cracking, leading to irreversible damage to equipment in a short period. Furthermore, media mixing can also lead to catalyst poisoning, product contamination, and unplanned system shutdowns, causing significant economic losses.

[0006] Currently, industry-wide leak monitoring for microchannel heat exchangers largely relies on indirect assessments of system outlet material composition analysis and process parameter changes, or offline detection methods such as periodic shutdowns for pressure testing and tracer gas leak detection. However, these methods generally suffer from significant delays: by the time a leak is confirmed through downstream component analysis or abnormal process parameters, some degree of media cross-contamination has usually occurred, making it difficult to obtain timely warnings and implement early intervention measures. Furthermore, such indirect assessments struggle to identify minute leaks early and accurately pinpoint the leak area. Since microchannel heat exchangers are mostly fully welded monolithic structures, damage to internal channels or baffles is typically difficult to repair effectively. If minute leaks are not detected and controlled early, they can escalate and potentially render the entire high-value heat exchanger unusable, or even trigger a wider safety incident. Summary of the Invention

[0007] This invention provides a microchannel heat exchanger to solve the problem in the prior art that real-time leakage monitoring of microchannel heat exchangers cannot be achieved, which easily leads to heat exchanger damage and safety accidents.

[0008] This invention provides a microchannel heat exchanger, comprising: a first heat exchange plate, a second heat exchange plate, an intermediate partition, and a detection element. The first heat exchange plate and the second heat exchange plate are alternately arranged. A first microchannel for the flow of a first medium is formed in the first heat exchange plate, and a second microchannel for the flow of a second medium is formed in the second heat exchange plate. The intermediate partition is disposed between the first heat exchange plate and the second heat exchange plate, and a leakage monitoring cavity is formed on the intermediate partition. The leakage monitoring cavity is located between and isolated from the first microchannel and the second microchannel. At least one guide channel is provided on the intermediate partition, and the guide channel communicates with the leakage monitoring cavity to facilitate the outflow of leakage medium in the leakage monitoring cavity to an external monitoring interface. The detection element is disposed at the monitoring interface and is adapted to detect leakage parameters of the first medium and / or the second medium.

[0009] Beneficial effects:

[0010] By setting a leakage monitoring chamber between the first and second microchannels and connecting it to an external monitoring interface, when a through-hole or micro-crack leak occurs in the first or second heat exchange plate, the leaking medium enters the leakage monitoring chamber, is guided out through the guide channel to the monitoring interface, and is captured by the detection element. This enables real-time monitoring of the leak, overcoming the lag problem of existing technologies that mainly rely on outlet material composition analysis or indirect judgment based on system parameters. The leakage monitoring chamber, as an intermediate buffer space between the first and second microchannels, allows the leaking medium to enter the leakage monitoring chamber first when a leak occurs, thus enabling measures to be taken before the first and second media substantially mix. The guide channel connects the leakage monitoring chamber to the external monitoring interface, enabling highly sensitive capture and rapid determination of early micro-leakage, thereby reducing the occurrence of safety accidents and improving the stability and safety of the system.

[0011] According to some embodiments of the present invention, the working pressure inside the leakage monitoring chamber is always lower than the pressure of the first medium in the first microchannel and the pressure of the second medium in the second microchannel.

[0012] According to some embodiments of the present invention, the leakage monitoring cavity is provided with multiple monitoring zones that are isolated from each other, and the guide channel is provided with multiple channels that are connected to the monitoring zones. The monitoring zones are led out to an external monitoring interface through the corresponding guide channel to realize the zone monitoring and location of leakage.

[0013] According to some embodiments of the present invention, the leakage parameters include at least one of pressure parameters, gas concentration parameters, liquid content, or chemical composition.

[0014] According to some embodiments of the present invention, the first heat exchange plate, the second heat exchange plate and the intermediate partition are integrally disposed by diffusion welding or brazing.

[0015] According to some embodiments of the present invention, the microchannel heat exchanger further includes a side plate assembly, the side plate assembly including a first side plate and a second side plate, the first heat exchange plate and the second heat exchange plate are provided in multiple pieces and are alternately stacked to form a heat exchange plate group, the first side plate and the second side plate are respectively disposed at both ends of the heat exchange plate group along the stacking direction, and the first side plate and the second side plate are fixedly connected to the first heat exchange plate and / or the second heat exchange plate by welding.

[0016] According to some embodiments of the present invention, the microchannel heat exchanger further includes a first feed pipe and a first discharge pipe; The first heat exchange plate has a first notch and a second notch on opposite sides of its edge. Both the first notch and the second notch are connected to the first microchannel. A first sealing structure is provided at the first notch, and a second sealing structure is provided at the second notch. The first feed pipe is connected to the first notch through the first sealing structure, and the first discharge pipe is connected to the second notch through the second sealing structure.

[0017] According to some embodiments of the present invention, the microchannel heat exchanger further includes a second feed pipe and a second discharge pipe; a third notch and a fourth notch are respectively provided on opposite sides of the edge of the second heat exchange plate, both the third notch and the fourth notch are connected to the second microchannel, a third sealing structure is provided at the third notch, a fourth sealing structure is provided at the fourth notch, the second feed pipe is connected to the third notch through the third sealing structure, and the second discharge pipe is connected to the fourth notch through the fourth sealing structure.

[0018] According to some embodiments of the present invention, the detection element includes at least one of a pressure sensor and / or a gas detector and / or a liquid detector and / or a specific chemical component sensor.

[0019] According to some embodiments of the present invention, the microchannel heat exchanger further includes an alarm system and a controller, both of which are communicatively connected to the controller. The detection element is adapted to feed back the detected leakage parameters to the controller, and the controller controls the alarm system to send a leakage alarm signal. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a microchannel heat exchanger provided in some embodiments of the present invention; Figure 2 This is an exploded view of the structure of a microchannel heat exchanger provided in some embodiments of the present invention; Figure 3 This is a schematic diagram of the structure of the intermediate partition provided in some embodiments of the present invention; Figure 4 This is a schematic diagram of another intermediate partition provided in some embodiments of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. First heat exchange plate; 11. First microchannel; 2. Second heat exchange plate; 21. Second microchannel; 3. Intermediate partition; 31. Leakage monitoring chamber; 32. Guide channel; 311. Monitoring zone; 4. Side plate assembly; 41. First side plate; 42. Second side plate; 5. First sealing structure; 51. First feed pipe; 6. Second sealing structure; 61. First discharge pipe; 7. Third sealing structure; 71. Second feed pipe; 8. Fourth sealing structure; 81. Second discharge pipe. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Reference Figure 1 and Figure 2 As shown, the present invention provides a microchannel heat exchanger, comprising: a first heat exchange plate 1, a second heat exchange plate 2, an intermediate partition 3, and a detection element. The first heat exchange plate 1 and the second heat exchange plate 2 are alternately arranged. A first microchannel 11 for the flow of a first medium is formed in the first heat exchange plate 1, and a second microchannel 21 for the flow of a second medium is formed in the second heat exchange plate 2. The intermediate partition 3 is disposed between the first heat exchange plate 1 and the second heat exchange plate 2. A leakage monitoring cavity 31 is formed on the intermediate partition 3. The leakage monitoring cavity 31 is located between the first microchannel 11 and the second microchannel 21 and is isolated from them. At least one guide channel 32 is provided on the intermediate partition 3. The guide channel 32 communicates with the leakage monitoring cavity 31 to facilitate the lead-out of the leakage medium in the leakage monitoring cavity 31 to an external monitoring interface. The detection element is disposed at the monitoring interface and is adapted to detect the leakage parameters of the first medium and / or the second medium.

[0025] Specifically, by setting a leakage monitoring chamber 31 between the first microchannel 11 and the second microchannel 21 and connecting it to an external monitoring interface, when a through-hole or micro-crack leak occurs in the first heat exchange plate 1 or the second heat exchange plate 2, the leaking medium enters the leakage monitoring chamber 31, is guided out through the guide channel 32 to the monitoring interface, and is captured by the detection element. This enables real-time monitoring of the leak, overcoming the lag problem of existing technologies that mainly rely on outlet material composition analysis or indirect judgment based on system parameters. The leakage monitoring chamber 31, as an intermediate buffer space between the first microchannel 11 and the second microchannel 21, allows the leaking medium to enter the leakage monitoring chamber 31 first when a leak occurs, thus allowing measures to be taken before the first and second media substantially mix. The guide channel 32 connects the leakage monitoring chamber 31 to the external monitoring interface, enabling highly sensitive capture and rapid determination of early micro-leakage, thereby reducing the occurrence of safety accidents and improving the stability and safety of the system.

[0026] In some embodiments of the present invention, the working pressure in the leakage monitoring chamber 31 is lower than the pressure of the first medium in the first microchannel 11 and the pressure of the second medium in the second microchannel 21.

[0027] Specifically, by maintaining the leakage monitoring chamber 31 at a pressure level lower than that of the first microchannel 11 and the second microchannel 21 on both sides, when a through-hole defect or microcrack leaks in the first microchannel 11 or the second microchannel 21, the leaking medium will preferentially enter the leakage monitoring chamber 31 under the action of the pressure difference. This increases the probability and speed at which the leaking medium is introduced into the monitoring channel and captured by the external detection element. Because the leaking medium is preferentially drawn into the leakage monitoring chamber 31, it can, to a certain extent, inhibit the leaking medium from directly entering the microchannel on the other side, reducing the probability and degree of substantial mixing of the cold and hot media. This is beneficial for triggering alarms and taking measures such as isolation, depressurization, or shutdown before the accident escalates.

[0028] It is understandable that a negative pressure drive structure can be set at the monitoring interface so that the leakage monitoring chamber 31 is always in a negative pressure state, and the leakage medium can be quickly drawn from the guide channel 32 to the monitoring interface for monitoring by the detection element, thereby improving monitoring efficiency and realizing faster and more sensitive online identification and early warning of early and minute leaks.

[0029] Reference Figure 3 and Figure 4 As shown, in some embodiments of the present invention, the leakage monitoring cavity 31 is provided with multiple monitoring partitions 311 that are isolated from each other, and multiple guide channels 32 are provided, and the multiple guide channels 32 are connected to the monitoring partitions 311. The monitoring partitions 311 are led out to the external monitoring interface through the corresponding guide channels 32 to realize the partition monitoring and location of leakage.

[0030] In some embodiments of the present invention, multiple monitoring zones 311 are spaced apart along the length of the intermediate partition 3.

[0031] Specifically, the monitoring zones 311 on the intermediate partition 3 are isolated from each other and each corresponds to an independent guide channel 32 and monitoring interface. When a leak occurs, the leaking medium will preferentially enter the monitoring zone 311 adjacent to / corresponding to the leak location, causing the detection signal to appear first or be more significant at a specific monitoring interface. This enables the location of the leak area and overcomes the problem of difficulty in determining the leak point or the need for post-incident investigation. The isolation of the monitoring zones 311 effectively avoids signal aliasing caused by the lateral diffusion of the leaking medium within the monitoring chamber, reduces the number of simultaneous responses from unknown sources in multiple zones, structurally reduces crosstalk and the probability of false alarms, and makes the alarm results more interpretable and engineering-usable.

[0032] Understandably, when multiple potential weak points or multiple micro-leaks exist, different zones can exhibit different pressure / composition change characteristics, facilitating the identification of differences between single-point and multi-point leaks, improving the diagnostic capability for complex failure modes, and providing a basis for maintenance decisions. Zone localization can narrow the investigation scope from the entire core to a specific plate bundle area or a specific heat exchange section, reducing the workload of disassembly and inspection, pressure testing, and tracer leak detection, significantly shortening the fault diagnosis and maintenance cycle, thereby reducing the economic losses caused by unplanned downtime.

[0033] In some embodiments of the present invention, the leakage parameters include at least one of pressure parameters, gas concentration parameters, liquid content, or chemical composition.

[0034] Specifically, the form of the leaked medium varies significantly across different application scenarios, and the medium may be inert, flammable, corrosive, or toxic. By supporting the detection of at least one of multiple parameters, such as pressure, gas concentration, liquid content, and chemical composition, a more suitable detection method can be selected for different media and operating conditions, thus improving the applicability of the solution. By detecting at least one of pressure, concentration, liquid content, or composition, and cross-validating it in engineering implementation, such as when abnormal pressure is accompanied by the appearance of characteristic components, false alarms of single parameters caused by fluctuations in operating conditions, vibration, and instantaneous pressure differences can be effectively reduced, improving the stability and reliability of the alarm.

[0035] Understandably, in a zoned monitoring structure, if different monitoring zones 311 detect different gas concentrations or characteristic chemical components, it can be used to help determine whether the leak originates from the first medium side or the second medium side, and combined with the information from the zone's initial response, to improve the accuracy of leak location.

[0036] In some embodiments of the present invention, the outer peripheries of the first heat exchange plate 1, the second heat exchange plate 2, and the intermediate partition plate 3 are integrally formed by diffusion welding or brazing.

[0037] Specifically, the first heat exchange plate 1, the second heat exchange plate 2, and the intermediate partition plate 3 are made of the same substrate, and the first microchannel 11, the second microchannel 21, and the leakage monitoring cavity 31 are formed by machining or etching, respectively. A continuous interface is formed on the outer periphery by diffusion welding or brazing, which can reduce or eliminate potential leakage channels caused by structures such as outer periphery sealing gaskets and bolt pre-tightening, so that the outer periphery of the plate bundle can be reliably sealed, reducing the risk of external leakage of the heat exchanger under high pressure conditions.

[0038] Understandably, the integrated connection of diffusion welding / brazing forms an integral load-bearing structure on the outer periphery of the first heat exchange plate 1, the second heat exchange plate 2, and the intermediate partition 3. This improves resistance to internal pressure bulging, thermal cycling, and pressure cycle fatigue, reduces cracking, delamination, or failure caused by weak peripheral connections, and thus enhances long-term operational reliability. Using diffusion welding or brazing to integrally fix the outer periphery of the plates reduces the number of components and assembly errors, minimizes deformation and sealing performance fluctuations caused by uneven preload or thermal expansion differences, improves product consistency, and facilitates large-scale manufacturing and quality control.

[0039] In some embodiments of the present invention, the microchannel heat exchanger further includes a side plate assembly 4, which includes a first side plate 41 and a second side plate 42. Multiple first heat exchange plates 1 and second heat exchange plates 2 are provided and are alternately stacked to form a heat exchange plate group. Along the stacking direction, the first side plate 41 and the second side plate 42 are respectively disposed at both ends of the heat exchange plate group. The first side plate 41 and the second side plate 42 are both fixedly connected to the first heat exchange plate 1 and / or the second heat exchange plate 2 by welding.

[0040] Specifically, the first side plate 41 and the second side plate 42 are respectively set at both ends of the heat exchange plate assembly and welded and fixed, which can form an end reinforcement and constraint structure, improve the overall deformation resistance of the first heat exchange plate 1 and the second heat exchange plate 2 under internal pressure, thermal stress and external load, reduce the risk of stacking misalignment, bulging or interlayer separation, and are suitable for harsh working conditions such as high pressure and high temperature.

[0041] The first heating plate and the second heat exchange plate 2 are stacked alternately and fixed by welding the first side plate 41 and the second side plate 42 at both ends. The first side plate 41 and the second side plate 42 can serve as positioning references and lock the plate bundle size, reduce the cumulative error during the assembly process, improve the consistency of thickness, channel alignment and welding quality, and reduce the probability of manufacturing defects.

[0042] In some embodiments of the present invention, the microchannel heat exchanger further includes a first feed pipe 51 and a first discharge pipe 61; The first heat exchange plate 1 has a first notch and a second notch on opposite sides of its edge. Both the first notch and the second notch are connected to the first microchannel 11. The first notch is sealed with a first cover structure 5, and the second notch is sealed with a second cover structure 6. The first feed pipe 51 is connected to the first notch through the first cover structure 5, and the first discharge pipe 61 is connected to the second notch through the second cover structure 6.

[0043] Specifically, by sealing the first notch with a first sealing structure 5 and the second notch with a second sealing structure 6, a relatively independent and controllable sealed connection interface is formed between the inlet / outlet pipes and the heat exchange plate microchannels. This effectively reduces the risk of leakage at the interface, making it particularly suitable for applications with high pressure, high temperature, or highly corrosive media, thus improving the overall operational safety and reliability. Both the first and second notches are connected to the first microchannel 11, forming a relatively compact inlet / outlet transition channel in conjunction with the first sealing structure 5 and the second sealing structure 6. This reduces the ineffective volume and dead zone of the end cavity, lowers local eddies and energy losses, and facilitates more stable flow distribution and pressure characteristics, thereby improving the stability and efficiency consistency of the heat exchange process.

[0044] It is understandable that the first feed pipe 51 and the first discharge pipe 61 are located on opposite sides of the edge of the first heat exchange plate 1, which facilitates modular connection and pipe laying with external systems; at the same time, the cover structure serves as a standardized connection unit, which facilitates welding / fixing and disassembly and maintenance, thereby improving assembly efficiency and maintainability in engineering applications.

[0045] In some embodiments of the present invention, the microchannel heat exchanger further includes a second feed pipe 71 and a second discharge pipe 81; a third notch and a fourth notch are respectively provided on opposite sides of the edge of the second heat exchange plate 2, both the third notch and the fourth notch are connected to the second microchannel 21, a third sealing structure 7 is provided at the third notch, a fourth sealing structure 8 is provided at the fourth notch, the second feed pipe 71 is connected to the third notch through the third sealing structure 7, and the second discharge pipe 81 is connected to the fourth notch through the fourth sealing structure 8.

[0046] Specifically, by sealing the third and fourth notches with the third and fourth sealing structures 7 and 8 respectively, an independent and controllable sealed connection interface is formed between the second feed pipe 71 / second discharge pipe 81 and the second microchannel 21. This effectively reduces the risk of interface leakage and improves the operational reliability and safety margin of the device under high pressure, high temperature, or corrosive media conditions. The third and fourth notches are connected to the second microchannel 21, forming a compact feed and discharge transition area in conjunction with the sealing structures. This reduces ineffective volume and dead zones at the ends, lowers local eddies and energy losses, and facilitates more stable flow distribution and pressure drop characteristics, thereby improving the stability and efficiency consistency of the heat exchange process.

[0047] In some embodiments of the present invention, the detection element includes at least one of a pressure sensor and / or a gas detector and / or a liquid detector and / or a specific chemical component sensor.

[0048] Specifically, microchannel heat exchangers may experience gas leakage, liquid leakage, or gas-liquid two-phase leakage under different operating conditions. By configuring various components such as gas detectors, liquid detectors, and pressure sensors, the appropriate detection method can be selected for different leakage modes, improving the solution's adaptability to various operating conditions.

[0049] In some embodiments of the present invention, the microchannel heat exchanger further includes an alarm system and a controller. Both the detection element and the alarm system are communicatively connected to the controller. The detection element is adapted to feed back the detected leakage parameters to the controller, and the controller controls the alarm system to send a leakage alarm signal.

[0050] Specifically, the controller receives and processes leakage parameters from the detection element in real time. When abnormal parameters reach a threshold, it automatically triggers the alarm system to output an alarm signal, avoiding the lag caused by manual reading and judgment. This significantly shortens the time from leak occurrence to alarm triggering, improving early warning capabilities. The controller can perform threshold judgment, filtering, trend judgment, or multi-signal fusion on signals such as pressure, concentration, liquid content, and chemical composition, thereby reducing the impact of operating condition fluctuations and instantaneous pulsations on the alarm, improving alarm accuracy and reliability.

[0051] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A microchannel heat exchanger, characterized in that, include: A first heat exchange plate (1) and a second heat exchange plate (2) are arranged alternately. A first microchannel (11) for the flow of a first medium is formed in the first heat exchange plate (1), and a second microchannel (21) for the flow of a second medium is formed in the second heat exchange plate (2). An intermediate partition (3) is disposed between the first heat exchange plate (1) and the second heat exchange plate (2). A leakage monitoring cavity (31) is formed on the intermediate partition (3). The leakage monitoring cavity (31) is located between the first microchannel (11) and the second microchannel (21) and is isolated from them. At least one guide channel (32) is provided on the intermediate partition (3). The guide channel (32) is connected to the leakage monitoring cavity (31) to facilitate the lead-out of the leakage medium in the leakage monitoring cavity (31) to an external monitoring interface. A detection element is disposed at the monitoring interface, the detection element being adapted to detect leakage parameters of the first medium and / or the second medium.

2. The microchannel heat exchanger according to claim 1, characterized in that, The working pressure inside the leakage monitoring chamber (31) is lower than the pressure of the first medium in the first microchannel (11) and the pressure of the second medium in the second microchannel (21).

3. The microchannel heat exchanger according to claim 1 or 2, characterized in that, The leakage monitoring chamber (31) is provided with multiple monitoring zones (311) that are isolated from each other. The guide channel (32) is provided with multiple channels and the multiple guide channels (32) are connected to the monitoring zones (311). The monitoring zones (311) are led out to the external monitoring interface through the corresponding guide channels (32) to realize the zone monitoring and location of leakage.

4. The microchannel heat exchanger according to claim 3, characterized in that, The leakage parameters include at least one of pressure parameters, gas concentration parameters, liquid content, or chemical composition.

5. The microchannel heat exchanger according to claim 1, characterized in that, The outer periphery of the first heat exchange plate (1), the second heat exchange plate (2) and the intermediate partition plate (3) are integrally formed by diffusion welding or brazing.

6. The microchannel heat exchanger according to claim 1, characterized in that, It also includes a side plate assembly (4), which includes a first side plate (41) and a second side plate (42). The first heat exchange plate (1) and the second heat exchange plate (2) are provided in multiple pieces and are stacked alternately to form a heat exchange plate group. Along the stacking direction, the first side plate (41) and the second side plate (42) are respectively located at both ends of the heat exchange plate group. The first side plate (41) and the second side plate (42) are fixedly connected to the first heat exchange plate (1) and / or the second heat exchange plate (2) by welding.

7. The microchannel heat exchanger according to claim 1, characterized in that, It also includes a first feed pipe (51) and a first discharge pipe (61); The first heat exchange plate (1) has a first notch and a second notch on opposite sides of its edge. Both the first notch and the second notch are connected to the first microchannel (11). The first notch is sealed with a first cover structure (5), and the second notch is sealed with a second cover structure (6). The first feed pipe (51) is connected to the first notch through the first cover structure (5), and the first discharge pipe (61) is connected to the second notch through the second cover structure (6).

8. The microchannel heat exchanger according to claim 7, characterized in that, It also includes a second feed pipe (71) and a second discharge pipe (81); a third notch and a fourth notch are respectively provided on opposite sides of the edge of the second heat exchange plate (2), the third notch and the fourth notch are both connected to the second microchannel (21), a third cover structure (7) is sealed at the third notch, a fourth cover structure (8) is sealed at the fourth notch, the second feed pipe (71) is connected to the third notch through the third cover structure (7), and the second discharge pipe (81) is connected to the fourth notch through the fourth cover structure (8).

9. The microchannel heat exchanger according to claim 1, characterized in that, The detection element includes at least one of a pressure sensor and / or a gas detector and / or a liquid detector and / or a specific chemical component sensor.

10. The microchannel heat exchanger according to claim 9, characterized in that, It also includes an alarm system and a controller. Both the detection element and the alarm system are communicatively connected to the controller. The detection element is adapted to feed back the detected leakage parameters to the controller, and the controller controls the alarm system to send a leakage alarm signal.

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