Micro-channel heat exchanger and refrigeration equipment

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a micro-channel heat exchanger which comprises a main header, a first heat exchanger, a second heat exchanger, a first heat exchanger and a second heat exchanger. The auxiliary header is provided with an auxiliary pipe body and a first auxiliary partition plate, and the first auxiliary partition plate divides the auxiliary pipe body into a first auxiliary header pipe cavity and a second auxiliary header pipe cavity; the first heat exchange unit comprises a first flat tube group, a second flat tube group and a third flat tube group; the main bypass pipe group comprises a main bypass pipe and a main conduction component; the auxiliary bypass pipe set comprises an auxiliary bypass pipe and an auxiliary conduction component. The micro-channel heat exchanger provided by the embodiment of the utility model has the effects of simplifying the structure of the heat exchanger and improving the heat exchange performance of the heat exchanger. The utility model further discloses the refrigeration equipment.

Description

Technical Field

[0001] This application relates to the technical field of heat exchangers, for example, to a microchannel heat exchanger and a refrigeration device. Background Art

[0002] With the increasing global awareness of energy conservation, emission reduction, and environmental protection, more and more consumers are starting to pay attention to the energy efficiency of household appliances and regard it as one of the important factors in their purchase decisions. Among them, air conditioners, as a major part of building energy consumption, are particularly concerned about their energy efficiency. Air conditioner manufacturers are also timely adjusting the structure and control logic of air conditioner products to meet the requirements of relevant energy efficiency standards. In addition to existing methods such as applying compressor frequency technology, improving refrigerant type ratio, and optimizing automatic temperature control logic, the variable flow splitting technology for optimizing the heat exchanger flow path has also received increasing attention from more and more air conditioner manufacturers.

[0003] The variable flow splitting technology for heat exchangers is an innovative design of an air conditioner refrigeration system. By adding check valves or on-off valves in the heat exchanger to regulate the use of refrigerant flow path branches, it can achieve using fewer pipeline branches during refrigeration to improve the heat rejection efficiency, and using more pipeline branches during heating to increase the heat absorption capacity. This design solves the problem that the flow path of traditional air conditioners is fixed during refrigeration and heating and cannot reach the optimal state simultaneously. Currently, the variable flow splitting technology has been applied to various types of heat exchangers such as fin-tube heat exchangers and microchannel heat exchangers.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related technologies:

[0005] In the related art, the microchannel heat exchanger applying the variable flow splitting technology has a relatively complex structure, and it is necessary to divide a single header into five, six or even more chambers; moreover, the number of valve components involved is also relatively large, generally requiring more than three check valves to achieve the variable flow path of the microchannel heat exchanger. This undoubtedly increases the manufacturing difficulty and production cost of the heat exchanger.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Utility Model Content

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] Embodiments of the present disclosure provide a microchannel heat exchanger and a refrigeration device, aiming to solve the technical problems of complex structure and numerous components of the microchannel heat exchanger applying variable flow splitting technology in the related art.

[0009] According to a first aspect of the present invention, there is provided a microchannel heat exchanger, comprising:

[0010] A main header, which has a main pipe body and a first main partition disposed in the main pipe body, and the first main partition is used to divide the main pipe body along the pipe length into a first main header subchamber and a second main header subchamber;

[0011] A secondary header, which is disposed in parallel and spaced apart from the main header, and has a secondary pipe body and a first secondary partition disposed in the main pipe body, and the first secondary partition is used to divide the secondary pipe body along the pipe length into a first secondary header subchamber and a second secondary header subchamber;

[0012] A first heat exchange unit, comprising a first flat tube group, a second flat tube group and a third flat tube group; wherein, two ends of the first flat tube group are respectively communicated with the first main header subchamber and the first secondary header subchamber, two ends of the second flat tube group are respectively communicated with the second main header subchamber and the first secondary header subchamber, and two ends of the third flat tube group are respectively communicated with the second main header subchamber and the second secondary header subchamber;

[0013] A main bypass pipe group, comprising a main bypass pipe and a main conduction component, wherein the main bypass pipe has a first main branch pipe communicating with the first main header subchamber and a second main branch pipe communicating with the second main header subchamber; the main conduction component is disposed on the second main branch pipe and is configured to control the on-off state of the second main branch pipe;

[0014] A secondary bypass pipe group, comprising a secondary bypass pipe and a secondary conduction component, wherein the secondary bypass pipe has a first secondary branch pipe communicating with the first secondary header subchamber and a second secondary branch pipe communicating with the second secondary header subchamber; the secondary conduction component is disposed on the first secondary branch pipe and is configured to control the on-off state of the first secondary branch pipe.

[0015] In some alternative embodiments, the first flat tube group, the second flat tube group and the third flat tube group are arranged side by side in parallel;

[0016] The first secondary partition and the first main partition are at different pipe length partitioning positions; wherein, the pipe section between the first main pipe end of the main pipe body and the first main partition constitutes the first main header subchamber, the pipe section between the second main pipe end of the main pipe body and the first main partition constitutes the second main header subchamber, the pipe section between the first secondary pipe end of the secondary pipe body and the first secondary partition constitutes the first secondary header subchamber, and the pipe section between the second secondary pipe end of the secondary pipe body and the first secondary partition constitutes the second secondary header subchamber.

[0017] In some alternative embodiments, the first flat tube group includes one or more first flat tubes; and / or,

[0018] The second flat tube group includes one or more second flat tubes; and / or,

[0019] The third flat tube group includes one or more third flat tubes.

[0020] In some alternative embodiments, the main header further includes a second main partition and a first main intermediate partition, which are sequentially arranged at intervals along the tube length of the main tube body to divide the main tube body into a third main header sub-chamber, a fourth main header sub-chamber, a first main header sub-chamber, and a second main header sub-chamber along the tube length;

[0021] The auxiliary header further includes a second auxiliary partition and a first auxiliary intermediate partition, which are sequentially arranged at intervals along the tube length of the auxiliary tube body to divide the auxiliary tube body into a third auxiliary header sub-chamber, a fourth auxiliary header sub-chamber, a first auxiliary header sub-chamber, and a second auxiliary header sub-chamber along the tube length;

[0022] The microchannel heat exchanger further includes a second heat exchange unit, including a fourth flat tube group, a fifth flat tube group, and a sixth flat tube group; wherein, both ends of the fourth flat tube group are respectively communicated with the third main header sub-chamber and the third auxiliary header sub-chamber, both ends of the fifth flat tube group are respectively communicated with the fourth main header sub-chamber and the third auxiliary header sub-chamber, and both ends of the sixth flat tube group are respectively communicated with the fourth main header sub-chamber and the fourth auxiliary header sub-chamber;

[0023] The main bypass pipe further has a third main branch pipe and a fourth main branch pipe; wherein one end of the third main branch pipe is connected to the fourth main header sub-chamber, and the other end is joined to the first main branch pipe; one end of the fourth main branch pipe is connected to the third main header sub-chamber, and the other end is joined to the second main branch pipe;

[0024] The auxiliary bypass pipe further has a third auxiliary branch pipe and a fourth auxiliary branch pipe; wherein one end of the third auxiliary branch pipe is connected to the third auxiliary header sub-chamber, and the other end is joined to the first auxiliary branch pipe; one end of the fourth auxiliary branch pipe is connected to the fourth auxiliary header sub-chamber, and the other end is joined to the second auxiliary branch pipe.

[0025] In some alternative embodiments, the other end of the third main branch pipe is joined to the pipeline of the first main branch pipe between the main conduction component and the second main header sub-chamber;

[0026] The other end of the third auxiliary branch pipe is joined to the pipeline of the first auxiliary branch pipe between the auxiliary conduction component and the first auxiliary header sub-chamber.

[0027] In some alternative embodiments, the other end of the third main branch pipe is joined to the pipeline of the first main branch pipe between the main conduction component and the main external connection port;

[0028] The other end of the third sub-branch pipe is connected in parallel to the pipeline of the first sub-branch pipe between the sub-conducting component and the sub-external connection port.

[0029] In some alternative embodiments, the fourth flat tube group includes one or more fourth flat tubes; and / or,

[0030] The fifth flat tube group includes one or more fifth flat tubes; and / or,

[0031] The sixth flat tube group includes one or more sixth flat tubes.

[0032] In some alternative embodiments, the main conducting component is configured to conduct the refrigerant flow path from the main header to the main bypass pipe and block the refrigerant flow path from the main bypass pipe to the main header; and / or

[0033] The sub-conducting component is configured to block the refrigerant flow path from the sub-header to the sub-bypass pipe and conduct the refrigerant flow path from the sub-bypass pipe to the sub-header.

[0034] In some alternative embodiments, the main conducting component is a check valve, and / or the sub-conducting component is a check valve.

[0035] According to the second aspect of the present utility model, there is also provided a refrigeration device, including a device main body; and, a microchannel heat exchanger as shown in any one of the embodiments of the foregoing first aspect.

[0036] The microchannel heat exchanger and the refrigeration device provided by the embodiments of the present disclosure can achieve the following technical effects:

[0037] The microchannel heat exchanger provided by the embodiments of the present disclosure is composed of two headers, two bypass pipe groups and a heat exchange unit. Each header can be divided into only two header sub-cavities, and the pipelines are connected through the bypass pipes and the conducting components of the bypass pipe groups, that is, the microchannel heat exchanger can realize the refrigerant heat exchange with different flow paths respectively in different refrigeration / heating operation modes, so as to achieve the effects of both simplifying the heat exchanger structure and improving the heat exchange performance of the heat exchanger.

[0038] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings

[0039] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0040] Figure 1 is a schematic diagram of a heat exchanger provided by an embodiment of the present disclosure;

[0041] Figure 1a is Figure 1 Schematic diagram of the heat exchanger provided by the embodiment when used as a condenser;

[0042] Figure 1b is Figure 1 Schematic diagram of the heat exchanger provided by the embodiment when used as an evaporator;

[0043] Figure 2 Schematic diagram of a heat exchanger provided by another embodiment of the present disclosure;

[0044] Figure 2a is Figure 2 Schematic diagram of the heat exchanger provided by the embodiment when used as a condenser;

[0045] Figure 2b is Figure 2 Schematic diagram of the heat exchanger provided by the embodiment when used as an evaporator;

[0046] Figure 3 Schematic diagram of a heat exchanger provided by another embodiment of the present disclosure;

[0047] Figure 3a is Figure 3 Schematic diagram of the heat exchanger provided by the embodiment when used as a condenser;

[0048] Figure 3b is Figure 3 Schematic diagram of the heat exchanger provided by the embodiment when used as an evaporator;

[0049] Figure 4 Schematic diagram of a heat exchanger provided by another embodiment of the present disclosure;

[0050] Figure 5 Schematic diagram of the structure of a refrigeration device provided by an embodiment of the present disclosure.

[0051] Reference numerals:

[0052] 10, microchannel heat exchanger;

[0053] 100, heat exchange unit group; 110, first heat exchange unit; 111, first flat tube group; 112, second flat tube group; 113, third flat tube group; 120, second heat exchange unit; 121, fourth flat tube group; 122, fifth flat tube group; 123, sixth flat tube group; 130, third heat exchange unit;

[0054] 200, main header; 210, main body; 221, first main partition; 222, second main partition; 223, first main intermediate partition; 231, first main header sub-chamber; 232, second main header sub-chamber; 233, third main header sub-chamber; 234, fourth main header sub-chamber;

[0055] 300, Sub-header; 310, Sub-pipe body; 321, First sub-partition board; 322, Second sub-partition board; 323, First sub-middle partition board; 331, First sub-header tube cavity; 332, Second sub-header tube cavity; 333, Third sub-header tube cavity; 334, Fourth sub-header tube cavity;

[0056] 400, Main bypass pipe group; 410, Main bypass pipe; 411, First main branch pipe; 412, Second main branch pipe; 413, Third main branch pipe; 414, Fourth main branch pipe; 420, Main conduction component;

[0057] 500, Sub-bypass pipe group; 510, Sub-bypass pipe; 511, First sub-branch pipe; 512, Second sub-branch pipe; 513, Third sub-branch pipe; 514, Fourth sub-branch pipe; 520, Sub-conduction component; 60, Refrigeration equipment; 61, Outdoor heat exchanger. Detailed implementation mode

[0058] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, a sufficient understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0059] The terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the embodiments of the present disclosure are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to describe the embodiments of the present disclosure here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0060] In the embodiments of the present disclosure, the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0061] In addition, the terms "arranged", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0062] Unless otherwise specified, the term "plurality" means two or more.

[0063] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0064] The term "and / or" is an associative relationship describing objects, indicating that there can be three relationships. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0065] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0066] The present application provides a microchannel heat exchanger 10, which can be used as a heat exchange component in a refrigeration device 60, and specifically can be used to enable the refrigerant flowing through the microchannel heat exchanger 10 to exchange heat with the air in the corresponding heat exchange area of the heat exchanger, thereby realizing the functions of heating up or absorbing heat and cooling down the heat exchange area. Optionally, the type of the refrigeration device 60 includes but is not limited to air conditioners, refrigerators, freezers, dehumidifiers, etc.; correspondingly, the application form of the microchannel heat exchanger 10 includes but is not limited to being used in the functional forms of "evaporator" or "condenser".

[0067] Combined with Figures 1 to 4 As shown, the embodiments of the present disclosure provide a microchannel heat exchanger 10, which at least includes a heat exchange unit group 100, a header group, and a bypass pipe group. Among them, the heat exchange unit group 100 is used to exchange heat with the environment where the microchannel heat exchanger 10 is located, so that the refrigerant flowing through the heat exchange unit can conduct heat to the external environment or absorb heat from the external environment. And, the header group is an intermediate pipe fitting for connecting the bypass pipe group and the heat exchange unit group 100, which can transport the refrigerant input by the bypass pipe group to the heat exchange unit group 100, and output the refrigerant after heat exchange by the heat exchange unit to the bypass pipe group. And, the bypass pipe group is a pipe group for connecting the external pipeline and the header group, so that the refrigerant can be transported between the external pipeline and the header group, and the bypass pipe group can also make the heat exchange unit form a variable flow path form, so that the heat exchange unit can transport the refrigerant in different flow paths in different operating modes such as heating / cooling, thereby improving the heat exchange efficiency in different operating modes.

[0068] Specifically, in this embodiment, the heat exchanger type is the microchannel heat exchanger 10. Here, the heat exchange unit group 100 includes one or more heat exchange units, and each heat exchange unit includes one or more flat tubes and heat dissipation fins. Among them, the inside of the flat tube is constructed with a flow channel for the refrigerant to flow, and the refrigerant can flow and exchange heat along the tube length direction of the flat tube; the heat dissipation fins are arranged between two adjacent flat tubes. Combining Figure 1 As shown, each flat tube is arranged parallel to the horizontal direction, and multiple flat tubes are arranged in sequence along the vertical direction. Also, the heat dissipation fins are installed in a wavy shape between two adjacent flat tubes, and the heat dissipation fins can conduct heat with the flat tubes on both sides thereof to play a role in accelerating the heat exchange of the flat tubes on both sides.

[0069] Optionally, the specific structures of the flat tubes and heat dissipation fins of the heat exchange unit can also adopt the known forms in the related art, and this application is not limited thereto.

[0070] In the embodiment, the heat exchange unit includes the first heat exchange unit 110. The first heat exchange unit 110, the header group, and the bypass pipe group can form a complete refrigerant flow path.

[0071] Here, the first heat exchange unit 110 includes multiple flat tube groups. The number of flat tube groups can be 3, 4, 6, etc.; for example Figure 1 In the illustrated embodiment, the first heat exchange unit 110 includes at least a first flat tube group 111, a second flat tube group 112, and a third flat tube group 113. Optionally, the first flat tube group 111 includes one or more first flat tubes. For example, the number of first flat tubes in the first flat tube group 111 is 1, 2, 3, 5, etc. Another option is that the second flat tube group 112 includes one or more second flat tubes. For example, the number of second flat tubes in the second flat tube group 112 is 1, 2, 4, 6, etc. The third flat tube group 113 includes one or more third flat tubes. For example, the number of third flat tubes in the third flat tube group 113 is 1, 2, 3, 4, 7, etc. Here, the refrigerant flow directions of the multiple flat tubes within the same flat tube group are the same under different operating modes. Thus, the same flat tube group can form one of the refrigerant branches of the first heat exchange unit 110, and the actual refrigerant flow rate of this refrigerant branch can be changed by adjusting the number of flat tubes in this group.

[0072] In the embodiment, the multiple flat tube groups of the first heat exchange unit 110 are arranged side by side in parallel, as Figure 1 shown, the first flat tube group 111, the second flat tube group 112, and the third flat tube group 113 of the first heat exchange unit 110 are parallel to each other and arranged side by side in the vertical direction.

[0073] In some alternative embodiments, the header assembly includes a main header 200 and a sub-header 300. Among them, the pipe bodies of the main header 200 and the sub-header 300 are arranged at intervals parallel to each other, and the interval space therebetween is for accommodating one or more heat exchange units of the aforementioned heat exchange unit group 100. Figure 1 In the illustrated embodiment, both the main header 200 and the sub-header 300 are arranged parallel to the vertical direction. Also, the same-side pipe orifices of the flat pipes of each heat exchange unit are connected to the main header 200, and the pipe orifices on the other same side are connected to the sub-header 300, and the refrigerant can flow between the main header 200 and the sub-header 300 via the heat exchange unit.

[0074] In the embodiment, the main header 200 includes a main pipe body 210 and a first main partition 221. Among them, the main pipe body 210 is the main pipe section part of the main header 200, and a header flow channel for the refrigerant to flow is internally formed along its pipe length direction. The first main partition 221 is placed inside the main pipe body 210, and it can separate the pipe body spaces on both sides thereof, so that two independent cavity spaces are formed inside the main pipe body 210, and each cavity space can be used as an independent section of refrigerant flow channel respectively; here, the cavity space of the main pipe body 210 separated by the main partition is defined as a "header sub-cavity".

[0075] Combined with Figure 1 As shown, the number of the first main partitions 221 provided inside the main pipe body 210 is 1, and it separates the main pipe body 210 along the pipe length direction into two header sub-cavities, namely a "first main header sub-cavity 231" and a "second main header sub-cavity 232". Here, the first main header sub-cavity 231 can correspond to one or more groups of flat pipe groups of the first heat exchange unit 110. For example, Figure 1 as shown in the first main header sub-cavity 231 corresponds to the first flat pipe group 111 of the first heat exchange unit 110; here, the number of flat pipe groups n1 corresponding to the first main header sub-cavity 231 satisfies the relationship: n1 ≤ N - 1, where N is the total number of flat pipe groups of the first heat exchange unit 110, that is, in Figure 1 the illustrated embodiment, the maximum number of flat pipe groups docked with the first main header sub-cavity 231 is 2 groups. Also, the second main header sub-cavity 232 can correspond to one or more groups of flat pipe groups of the first heat exchange unit 110. For example, Figure 1 as shown in the second main header sub-cavity 232 corresponds to the first flat pipe group 111 and the second flat pipe group 112 of the first heat exchange unit 110; here, the number of flat pipe groups n2 corresponding to the second main header sub-cavity 232 satisfies the relationship: n2 ≤ N - 1, that is, in Figure 1 the illustrated embodiment, the maximum number of flat pipe groups docked with the second main header sub-cavity 232 is 2 groups.

[0076] In addition, the number of flat tube groups corresponding to the first main header tube cavity 231 and the second main header tube cavity 232 respectively also satisfies the relationship: n1 + n2 = N. That is, a part of the flat tube groups of the first heat exchange unit 110 is connected to the first main header tube cavity 231, and the remaining flat tube groups are connected to the second main header tube cavity 232. Thus, it is ensured that all the flat tube groups of the first heat exchange unit 110 can be connected to the main header 200 in a flow path.

[0077] In Figure 1 the illustrated embodiment, the left port of the first flat tube group 111 is communicated with the first main header tube cavity 231, and the left ports of the second flat tube group 112 and the third flat tube group 113 are communicated with the second main header tube cavity 232.

[0078] Moreover, in the embodiment, the sub-header 300 includes a sub-tube body 310 and a first sub-partition 321. Among them, the sub-tube body 310 is the sub-body tube section part of the sub-header 300, and a header flow channel for refrigerant flow is constructed inside it along its tube length direction. The first sub-partition 321 is placed inside the sub-tube body 310, and it can separate the tube space on both sides of it, so that two independent cavity spaces are formed inside the sub-tube body 310, and each cavity space can be used as an independent section of refrigerant flow channel respectively; here, the cavity space of the sub-tube body 310 formed by the sub-partition is also defined as a "header tube cavity".

[0079] Similarly, as shown in Figure 1 the number of the first sub-partitions 321 provided in the sub-tube body 310 is 1, and it separates the sub-tube body 310 along the tube length direction into two header tube cavities, namely the "first sub-header tube cavity 331" and the "second sub-header tube cavity 332". Here, the first sub-header tube cavity 331 can correspond to one or more groups of flat tube groups of the first heat exchange unit 110. For example, Figure 1 the first sub-header tube cavity 331 shown in is respectively connected to the first flat tube group 111 and the second flat tube group 112 of the first heat exchange unit 110; the number of flat tube groups m1 corresponding to the first sub-header tube cavity 331 satisfies the relationship: m1 ≤ N - 1, where N is the total number of flat tube groups of the first heat exchange unit 110. That is, in Figure 1 the illustrated embodiment, the maximum number of flat tube groups docked with the first sub-header tube cavity 331 is 2 groups. Moreover, the second sub-header tube cavity 332 can correspond to one or more groups of flat tube groups of the first heat exchange unit 110. For example, Figure 1 the second sub-header tube cavity 332 shown in is connected to the third flat tube group 113 of the first heat exchange unit 110; the number of flat tube groups n2 corresponding to the second sub-header tube cavity 332 satisfies the relationship: m2 ≤ N - 1. That is, in Figure 1 the illustrated embodiment, the maximum number of flat tube groups docked with the second sub-header tube cavity 332 is 2 groups.

[0080] In addition, the number of flat tube groups corresponding to the first secondary header cavity 331 and the second secondary header cavity 332 respectively also satisfies the relationship: m1 + m2 = N. That is, a part of the flat tube groups of the first heat exchange unit 110 communicates with the first secondary header cavity 331, and the remaining flat tube groups communicate with the second secondary header cavity 332. This ensures that all the flat tube groups of the first heat exchange unit 110 can be connected to the secondary header 300 in terms of flow path.

[0081] In Figure 1 In the illustrated embodiment, the right ports of the first flat tube group 111 and the second flat tube group 112 communicate with the first secondary header cavity 331, and the left port of the third flat tube group 113 communicates with the second secondary header cavity 332. At the same time, to achieve the variable flow path design of the heat exchange unit, at least one port of the flat tube group connected to the first secondary header cavity 331 communicates with the second main header cavity 232. For example, in this embodiment, the right port of the second flat tube group 112 communicates with the first secondary header cavity 331, and the left port communicates with the second main header cavity 232.

[0082] Correspondingly, since the multiple flat tube groups of the first heat exchange unit 110 are arranged uniformly in the vertical direction in the previous embodiment, in order to enable each header cavity of the main header 200 and the secondary header 300 to have sufficient cavity length to dock with the corresponding flat tube groups, in this embodiment, the separation and assembly positions of the first main partition 221 relative to the main header 200 and the first secondary partition 321 relative to the secondary header 300 need to meet the above requirements.

[0083] Exemplarily, since the number of flat tube groups docked with the first main header cavity 231 is less than that docked with the second main header cavity 232, and the number of flat tube groups docked with the first secondary header cavity 331 is more than that docked with the second secondary header cavity 332, the first secondary partition 321 and the first main partition 221 are located at different tube length separation positions. As Figure 1 shown, in terms of the vertical height position, the vertical height position of the first secondary partition 321 is lower than that of the first main partition 221, so that the cavity length of the first main header cavity 231 in the main header 200 is less than that of the second main header cavity 232, and the cavity length of the first secondary header cavity 331 in the secondary header 300 is greater than that of the second secondary header cavity 332.

[0084] Figure 1In it, the main pipe body 210 includes a first main pipe end and a second main pipe end, where the first main pipe end is the vertical top end of the main pipe body 210, and the second main pipe end is the vertical bottom end of the main pipe body 210; and, the auxiliary pipe body 310 includes a first auxiliary pipe end and a second auxiliary pipe end, where the first auxiliary pipe end is the vertical top end of the auxiliary pipe body 310, and the second auxiliary pipe end is the vertical bottom end of the auxiliary pipe body 310. The first main pipe end and the first auxiliary pipe end are located at the same vertical height position, and the second main pipe end and the second auxiliary pipe end are located at the same vertical height position. In this way, the pipe section between the first main pipe end of the second main pipe body 210 and the first main partition 221 forms the first main collector sub-chamber 231, and the pipe section between the second main pipe end of the main pipe body 210 and the first main partition 221 forms the second main collector sub-chamber 232. The pipe section between the first auxiliary pipe end of the auxiliary pipe body 310 and the first auxiliary partition 321 forms the first auxiliary collector sub-chamber 331, and the pipe section between the second auxiliary pipe end of the auxiliary pipe body 310 and the first auxiliary partition 321 forms the second auxiliary collector sub-chamber 332. At the same time, the first main partition 221 is located between the first main pipe end and the second main pipe end, and the distance between the first main partition 221 and the first main pipe end is less than the distance between the first main partition 221 and the second main pipe end; the first auxiliary partition 321 is located between the first auxiliary pipe end and the second auxiliary pipe end, and the distance between the first auxiliary partition 321 and the first auxiliary pipe end is greater than the distance between the first auxiliary partition 321 and the second auxiliary pipe end.

[0085] Another optional one is that for the above embodiment, the number of flat tubes in each flat tube group of the first heat exchange unit 110 is the same. In this case, the cavity length of the first main collector sub-chamber 231 is basically the same as the cavity length of the second auxiliary collector sub-chamber 332, and the cavity length of the second main collector sub-chamber 232 is basically the same as the cavity length of the first auxiliary collector sub-chamber 331, so that the cavity space of each collector sub-chamber can adapt to the corresponding number (number of groups) of flat tubes. In the previous multiple embodiments, the diameters of the main collector 200 and the auxiliary collector 300 are the same.

[0086] In some optional embodiments, the bypass pipe group mainly includes a main bypass pipe group 400 and an auxiliary bypass pipe group 500. Among them, when the micro-channel heat exchanger 10 is used as a "condenser", the main bypass pipe group 400 is the flow path pipe group for the refrigerant to flow into the micro-channel heat exchanger 10, and the auxiliary bypass pipe group 500 is the flow path pipe group for the refrigerant to flow out of the micro-channel heat exchanger 10; when the micro-channel heat exchanger 10 is used as an "evaporator", the main bypass pipe group 400 is the flow path pipe group for the refrigerant to flow out of the micro-channel heat exchanger 10, and the auxiliary bypass pipe group 500 is the flow path pipe group for the refrigerant to flow into the micro-channel heat exchanger 10.

[0087] Specifically, the main bypass pipe group 400 includes a main bypass pipe 410 and a main guiding component 420. Combining Figure 1As shown, one end of the main bypass pipe 410 is for connecting to an external pipeline, and the other end is divided into a first main branch pipe 411 and a second main branch pipe 412 in parallel. The first main branch pipe 411 communicates with the first main header subchamber 231, and the second main branch pipe 412 communicates with the second main header subchamber 232. Meanwhile, the main conduction component 420 is arranged on the second main branch pipe 412 and is configured to control the on-off state of the second main branch pipe 412 under different refrigerant flow directions.

[0088] Here, the main conduction component 420 is set to conduct the refrigerant flow path from the main header 200 to the main bypass pipe 410 and block the refrigerant flow path from the main bypass pipe 410 to the main header 200. In this embodiment, the main conduction component 420 is a check valve or a control valve. Optionally, the main conduction component 420 is a check valve, and its conduction direction is specifically configured as a one-way conduction form that blocks when the refrigerant flows from the external pipeline side to the second main header subchamber 232 side and conducts when the refrigerant flows from the second main header subchamber 232 side to the external pipeline side. Another option is that the main conduction component 420 is a control valve, and its specific configuration is an on-off control form that opens when the refrigerant flows from the second main header subchamber 232 side to the external pipeline side and closes when the refrigerant flows from the external pipeline side to the second main header subchamber 232 side.

[0089] And, the auxiliary bypass pipe group 500 includes an auxiliary bypass pipe 510 and an auxiliary conduction component 520. Combining Figure 1 As shown, one end of the auxiliary bypass pipe 510 is for connecting to an external pipeline, and the other end is divided into a first auxiliary branch pipe 511 and a second auxiliary branch pipe 512 in parallel. The first auxiliary branch pipe 511 communicates with the first auxiliary header subchamber 331, and the second auxiliary branch pipe is connected to the second auxiliary header subchamber 332. Meanwhile, the auxiliary conduction component 520 is arranged on the first auxiliary branch pipe 511 and is configured to control the on-off state of the first auxiliary branch pipe 511 under different refrigerant flow directions.

[0090] Here, the auxiliary conduction component 520 is set to block the refrigerant flow path from the auxiliary header 300 to the auxiliary bypass pipe 510 and conduct the refrigerant flow path from the auxiliary bypass pipe 510 to the auxiliary header 300. The auxiliary conduction component 520 in this embodiment is a check valve or a control valve. Optionally, the auxiliary conduction component 520 is a check valve, and its conduction direction is configured as a one-way conduction form that conducts when the refrigerant flows from the external pipeline side to the first auxiliary header subchamber 331 side and blocks when the refrigerant flows from the first auxiliary header subchamber 331 side to the external pipeline side. Another option is that the auxiliary conduction component 520 is a control valve, and its configuration is an on-off control form that opens when the refrigerant flows from the external pipeline side to the first auxiliary header subchamber 331 side and closes when the refrigerant flows from the first auxiliary header subchamber 331 side to the external pipeline side.

[0091] In the foregoing embodiments, the external pipeline includes a first external pipeline and a second external pipeline. Among them, when the microchannel heat exchanger 10 is used as a "condenser", the first external pipeline is the pipeline for the refrigerant to flow in, and the second external pipeline is the pipeline for the refrigerant to flow out; and when the microchannel heat exchanger 10 is used as an "evaporator", the first external pipeline is the pipeline for the refrigerant to flow out, and the second external pipeline is the pipeline for the refrigerant to flow in. Here, the main bypass pipe group 400 is connected to the first external pipeline, and the secondary bypass pipe group 500 is connected to the second external pipeline.

[0092] In this way, when the microchannel heat exchanger 10 is used as a "condenser", as Figure 1a shown, the refrigerant flows through each refrigerant flow path in the direction shown by the arrow. The actual number of branch flow paths of the microchannel heat exchanger 10 decreases, and the refrigerant flow path extends, so that the condensation effect on the gaseous refrigerant can be improved. And when the microchannel heat exchanger 10 is used as an "evaporator", as Figure 1b shown, the refrigerant flows through each flat tube group of the first heat exchange unit 110 in the direction shown by the arrow. The number of refrigerant branch paths of the microchannel heat exchanger 10 is large, so that the evaporation and heat absorption effect on the liquid refrigerant can be enhanced.

[0093] In some other alternative embodiments, the heat exchange unit group 100 includes two heat exchange units, specifically including a first heat exchange unit 110 and a second heat exchange unit 120, as Figure 2 and Figure 3 shown, the second heat exchange unit 120 and the first heat exchange unit 110 are arranged in a stacked manner in the vertical direction. Here, the first heat exchange unit 110 and the second heat exchange unit 120 can respectively form a complete refrigerant flow path with the header group and the bypass pipeline, and the refrigerant flow paths of the two heat exchange units do not interfere with each other.

[0094] Specifically, the second heat exchange unit 120 includes a plurality of flat tube groups. For example, the number of flat tube groups can be 3, 4, 6, etc. Figure 2 The second heat exchange unit 120 shown in at least includes a fourth flat tube group 121, a fifth flat tube group 122, and a sixth flat tube group 123. Optionally, the fourth flat tube group 121 includes one or more fourth flat tubes; and / or, the fifth flat tube group 122 includes one or more fifth flat tubes; and / or, the sixth flat tube group 123 includes one or more sixth flat tubes. Here, the specific form of the flat tube group of the second heat exchange unit 120 can refer to the "first heat exchange unit 110" in the foregoing embodiments, and will not be elaborated here.

[0095] In an embodiment, in addition to the first main partition 221 in the previous embodiment, the main header 200 is further provided with a second main partition 222 and a first main intermediate partition 223 to separate a pipe body space in the main header 200 that is respectively communicated with the first heat exchange unit 110 and the second heat exchange unit 120. Specifically, the second main partition 222, the first main intermediate partition 223, and the first main partition 221 are sequentially arranged at intervals along the pipe length of the main pipe body 210. Here, the second main partition 222 is located on one side close to the first main pipe end of the main header 200, and the first main partition 221 is located on one side close to the second main pipe end of the main header 200. It can divide the main pipe body 210 along the pipe length into a third main header sub-cavity 233, a fourth main header sub-cavity 234, a first main header sub-cavity 231, and a second main header sub-cavity 232, as Figure 2 shown. Here, the third main header sub-cavity 233 and the fourth main header sub-cavity 234 are used for flow path cooperation with the second heat exchange unit 120, and the first main header sub-cavity 231 and the second main header sub-cavity 232 are used for flow path cooperation with the first heat exchange unit 110.

[0096] Similarly, in addition to the first sub-partition 321 in the previous embodiment, the sub-header 300 is further provided with a second sub-partition 322 and a first sub-intermediate partition 323, so as to also separate a pipe body space in the sub-header 300 that is respectively communicated with the first heat exchange unit 110 and the second heat exchange unit 120. Specifically, the second sub-partition 322, the first sub-intermediate partition 323, and the first sub-partition 321 are sequentially arranged at intervals along the pipe length of the sub-pipe body 310. Here, the second sub-partition 322 is located on one side close to the first sub-pipe end of the sub-header 300, and the first sub-partition 321 is located on one side close to the second sub-pipe end of the sub-header 300. It can divide the sub-pipe body 310 along the pipe length into a third sub-header sub-cavity 333, a fourth sub-header sub-cavity 334, a first sub-header sub-cavity 331, and a second sub-header sub-cavity 332, as Figure 2 shown. Here, the third sub-header sub-cavity 333 and the fourth sub-header sub-cavity 334 are used for flow path cooperation with the second heat exchange unit 120, and the first sub-header sub-cavity 331 and the second sub-header sub-cavity 332 are used for flow path cooperation with the first heat exchange unit 110.

[0097] Similar to the cooperation between the first heat exchange unit 110 and the header group, both ends of the fourth flat tube group 121 of the second heat exchange unit 120 are respectively communicated with the third main header sub-cavity 233 and the third sub-header sub-cavity 333, both ends of the fifth flat tube group 122 are respectively communicated with the fourth main header sub-cavity 234 and the third sub-header sub-cavity 333, and both ends of the sixth flat tube group 123 are respectively communicated with the fourth main header sub-cavity 234 and the fourth sub-header sub-cavity 334. Optionally, the assembly form of the flat tube group of the second heat exchange unit 120 and the header group can refer to the first heat exchange unit 110 in the previous embodiment, which will not be elaborated here.

[0098] In addition, in order to achieve the assembly and flow path conduction of the main bypass pipe group 400, the auxiliary bypass pipe group 500 and the second heat exchange unit 120, the main bypass pipe 410 further includes a third main branch pipe 413 and a fourth main branch pipe 414. One end of the third main branch pipe 413 is connected to the fourth main collector sub-chamber 234, and the other end is connected in parallel to the first main branch pipe 411; one end of the fourth main branch pipe 414 is connected to the third main collector sub-chamber 233, and the other end is connected in parallel to the second main branch pipe 412. In addition, the auxiliary bypass pipe 510 further includes a third auxiliary branch pipe 513 and a fourth auxiliary branch pipe 514. One end of the third auxiliary branch pipe 513 is connected to the third auxiliary collector sub-chamber 333, and the other end is connected in parallel to the first auxiliary branch pipe 511; one end of the fourth auxiliary branch pipe 514 is connected to the fourth auxiliary collector sub-chamber 334, and the other end is connected in parallel to the second auxiliary branch pipe 512.

[0099] In the embodiment, the second heat exchange unit 120 can be either in the form of a variable shunt flow path or in the form of a conventional refrigerant flow path.

[0100] Optionally, as shown in Figure 2 In the embodiment, the second heat exchange unit 120 is in the form of a variable shunt flow path. In this embodiment, the other end of the third main branch pipe 413 of the main bypass pipe 410 is connected in parallel to the pipeline of the first main branch pipe 411 between the main conduction component 420 and the second main collector sub-chamber 232; the other end of the third auxiliary branch pipe 513 of the auxiliary bypass pipe 510 is connected in parallel to the pipeline of the first auxiliary branch pipe 511 between the auxiliary conduction component 520 and the first auxiliary collector sub-chamber 331.

[0101] Therefore, when the microchannel heat exchanger 10 is used as a "condenser" in this embodiment, as shown in Figure 2a The refrigerant flows through the two heat exchange units in the direction indicated by the arrow. The actual number of branch flow paths of each of the first heat exchange unit 110 and the second heat exchange unit 120 decreases and the refrigerant flow path of itself extends, so as to improve the condensation effect of the gaseous refrigerant flowing through each heat exchange unit. And when the microchannel heat exchanger 10 is used as an "evaporator", as shown in Figure 2b The refrigerant flows through the two heat exchange units in the direction indicated by the arrow. The number of refrigerant branch paths of each of the first heat exchange unit 110 and the second heat exchange unit 120 is large, so as to enhance the evaporation and heat absorption effect of the liquid refrigerant.

[0102] Optionally, as shown in Figure 3As shown, the second heat exchange unit 120 has a conventional refrigerant flow path form. In this form, the number of branch flow paths of the refrigerant is the same and the flow directions are opposite under different operating modes. Specifically, the other end of the third main branch pipe 413 of the main bypass pipe 410 is connected in parallel to the pipeline of the first main branch pipe 411 located between the main conduction component 420 and the main external connection port; the other end of the third sub-branch pipe 513 of the sub-bypass pipe 510 is connected in parallel to the pipeline of the first sub-branch pipe 511 located between the sub-conduction component 520 and the sub-external connection port.

[0103] Therefore, when the microchannel heat exchanger 10 is used as a "condenser" in this embodiment, as Figure 3a shown, the refrigerant flows through the two heat exchange units along the direction shown by the arrow. The number of flow paths of the first heat exchange unit 110 decreases and the refrigerant flow path extends, while the second heat exchange unit 120 still exchanges heat with three parallel refrigerant branches. And when the microchannel heat exchanger 10 is used as an "evaporator", as Figure 3b shown, the refrigerant flows through the two heat exchange units along the direction shown by the arrow. The number of refrigerant branches of the first heat exchange unit 110 increases and it exchanges heat with three parallel refrigerant branches, while the number of refrigerant branches of the second heat exchange unit 120 remains unchanged and it also exchanges heat with the aforementioned three parallel refrigerant branches.

[0104] In some other alternative embodiments, the number of heat exchange units of the microchannel heat exchanger 10 can also be more than 2, such as 3, 4, 7, etc. Specifically, it can be selected according to the design requirements for the heat exchange capacity of the microchannel heat exchanger 10. For example Figure 4 in the embodiment, the number of heat exchange units is 3, including the first heat exchange unit 110, the second heat exchange unit 120, and the third heat exchange unit 130.

[0105] Optionally, in this embodiment, multiple heat exchange units can all be of the variable split flow path form, or all be of the conventional refrigerant flow path form, or some of the heat exchange units are of the variable split flow path form and some are of the conventional refrigerant flow path form. This application does not limit this. Here, the assembly forms of each heat exchange unit with the header group and the bypass pipe group can refer to the previous embodiments and will not be elaborated here.

[0106] In some other embodiments, this application also discloses a refrigeration device 60. Optionally, the type of the refrigeration device 60 includes but is not limited to air conditioners, refrigerators, freezers, etc.

[0107] Specifically, the refrigeration device 60 includes a device main body and the microchannel heat exchanger 10 shown in the previous embodiments. Here, taking the refrigeration device 60 as an air conditioner as an example, the above-mentioned microchannel heat exchanger 10 can be the outdoor heat exchanger 61 of its outdoor unit, as Figure 5As shown, and / or, it is the indoor heat exchanger of its indoor unit. The refrigeration device 60 adopts the microchannel heat exchanger 10 shown in the above embodiment, which can take into account the effects of both simplifying the heat exchanger structure and improving the heat exchange performance of the heat exchanger, effectively reducing the manufacturing difficulty and production cost of the refrigeration device 60.

[0108] The above description and the drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural and other changes. Embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A microchannel heat exchanger, characterized in that: include: A main header (200) comprises a main body (210) and a first main partition (221) disposed in the main body (210), wherein the first main partition (221) is used to divide the main body (210) into a first main header sub-cavity (231) and a second main header sub-cavity (232) along the length of the tube; The auxiliary manifold (300) is arranged in parallel with the main manifold (200) and comprises an auxiliary pipe body (310) and a first auxiliary partition (321) arranged in the main pipe body (210). The first auxiliary partition (321) is used to divide the auxiliary pipe body (310) into a first auxiliary manifold sub-cavity (331) and a second auxiliary manifold sub-cavity (332) along the pipe length. The first heat exchange unit (110) comprises a first flat tube group (111), a second flat tube group (112) and a third flat tube group (113); wherein two ends of the first flat tube group (111) are respectively connected to the first main header sub-cavity (231) and the first sub-header sub-cavity (331), two ends of the second flat tube group (112) are respectively connected to the second main header sub-cavity (232) and the first sub-header sub-cavity (331), and two ends of the third flat tube group (113) are respectively connected to the second main header sub-cavity (232) and the second sub-header sub-cavity (332); The main bypass pipe group (400) comprises a main bypass pipe (410) and a main flow component (420), wherein the main bypass pipe (410) comprises a first main branch pipe (411) connected to a first main header sub-cavity (231) and a second main branch pipe (412) connected to a second main header sub-cavity (232); the main flow component (420) is arranged on the second main branch pipe (412) and is arranged to control the on / off state of the second main branch pipe (412); The auxiliary bypass pipe group (500) comprises an auxiliary bypass pipe (510) and an auxiliary conduction component (520), wherein the auxiliary bypass pipe (510) has a first auxiliary branch pipe (511) connected to the first auxiliary manifold sub-cavity (331), and a second auxiliary branch pipe (512) connected to the second auxiliary manifold sub-cavity (332); the auxiliary conduction component (520) is arranged on the first auxiliary branch pipe (511), and is arranged to control the on-off state of the first auxiliary branch pipe (511).

2. The microchannel heat exchanger according to claim 1, characterized in that: The first flat tube group (111), the second flat tube group (112) and the third flat tube group (113) are arranged parallel to each other; The first auxiliary partition (321) and the first main partition (221) are located at different pipe length separation positions; wherein the pipe section between the first main pipe end of the main pipe body (210) and the first main partition (221) constitutes a first main pipe collecting sub-cavity (231), the pipe section between the second main pipe end of the main pipe body (210) and the first main partition (221) constitutes a second main pipe collecting sub-cavity (232), the pipe section between the first auxiliary pipe end of the auxiliary pipe body (310) and the first auxiliary partition (321) constitutes a first auxiliary pipe collecting sub-cavity (331), and the pipe section between the second auxiliary pipe end of the auxiliary pipe body (310) and the first auxiliary partition (321) constitutes a second auxiliary pipe collecting sub-cavity (332).

3. The microchannel heat exchanger according to claim 1, characterized in that: The first flat tube group (111) includes one or more first flat tubes; and / or, The second flat tube group (112) includes one or more second flat tubes; and / or, The third flat tube group (113) includes one or more third flat tubes.

4. The microchannel heat exchanger according to claim 1, characterized in that: The main manifold (200) further comprises a second main baffle (222) and a first main intermediate baffle (223); the second main baffle (222), the first main intermediate baffle (223) and the first main baffle (221) are sequentially arranged at intervals along the tube length of the main pipe body (210) so as to divide the main pipe body (210) into a third main manifold sub-cavity (233), a fourth main manifold sub-cavity (234), a first main manifold sub-cavity (231) and a second main manifold sub-cavity (232) along the tube length; The auxiliary manifold (300) further comprises a second auxiliary baffle (322) and a first auxiliary intermediate baffle (323); the second auxiliary baffle (322), the first auxiliary intermediate baffle (323) and the first auxiliary baffle (321) are sequentially arranged at intervals along the tube length of the auxiliary tube body (310) so as to divide the auxiliary tube body (310) into a third auxiliary manifold sub-cavity (333), a fourth auxiliary manifold sub-cavity (334), a first auxiliary manifold sub-cavity (331) and a second auxiliary manifold sub-cavity (332) along the tube length; The microchannel heat exchanger also includes a second heat exchange unit (120), including a fourth flat tube group, a fifth flat tube group and a sixth flat tube group; wherein two ends of the fourth flat tube group are respectively connected to the third main header sub-cavity (233) and the third sub-header sub-cavity (333), two ends of the fifth flat tube group are respectively connected to the fourth main header sub-cavity (234) and the third sub-header sub-cavity (333), and two ends of the sixth flat tube group are respectively connected to the fourth main header sub-cavity (234) and the fourth sub-header sub-cavity (334); The main bypass pipe (410) further comprises a third main branch pipe (413) and a fourth main branch pipe (414); wherein one end of the third main branch pipe (413) is connected to the fourth main header sub-cavity (234), and the other end is connected to the first main branch pipe (411); one end of the fourth main branch pipe (414) is connected to the third main header sub-cavity (233), and the other end is connected to the second main branch pipe (412); The secondary bypass pipe (510) also has a third secondary branch pipe (513) and a fourth secondary branch pipe (514); one end of the third secondary branch pipe (513) is connected to the third secondary manifold sub-cavity (333), and the other end is connected to the first secondary branch pipe (511); one end of the fourth secondary branch pipe (514) is connected to the fourth secondary manifold sub-cavity (334), and the other end is connected to the second secondary branch pipe (512).

5. The microchannel heat exchanger according to claim 4, characterized in that: The other end of the third main branch pipe (413) is connected to the pipeline of the first main branch pipe (411) between the main flow component (420) and the second main header sub-chamber (232); The other end of the third auxiliary branch pipe (513) is connected in parallel to the pipeline of the first auxiliary branch pipe (511) located between the auxiliary conducting component (520) and the first auxiliary manifold sub-cavity (331).

6. The microchannel heat exchanger according to claim 4, characterized in that: The other end of the third main branch pipe (413) is connected to the pipeline between the main flow component (420) and the main external pipe port of the first main branch pipe (411); The other end of the third auxiliary branch pipe (513) is connected in parallel to the pipeline of the first auxiliary branch pipe (511) located between the auxiliary conducting component (520) and the auxiliary external pipe port.

7. The microchannel heat exchanger according to claim 4, characterized in that: The fourth flat tube group includes one or more fourth flat tubes; and / or, The fifth flat tube group includes one or more fifth flat tubes; and / or, The sixth flat tube group includes one or more sixth flat tubes.

8. The microchannel heat exchanger according to any one of claims 1 to 7, characterized in that: The main conducting component (420) is configured to conduct the flow path for outputting the refrigerant from the main header (200) to the main bypass pipe (410), and to block the flow path for inputting the refrigerant from the main bypass pipe (410) to the main header (200); and / or The secondary conducting component (520) is configured to block the flow path for outputting the refrigerant from the secondary header (300) to the secondary bypass pipe (510), and to conduct the flow path for inputting the refrigerant from the secondary bypass pipe (510) to the secondary header (300).

9. The microchannel heat exchanger according to claim 8, characterized in that: The main conducting component (420) is a one-way valve, and / or the secondary conducting component (520) is a one-way valve.

10. A refrigeration device, characterized in that: include: Equipment body; and, The microchannel heat exchanger (10) according to any one of claims 1 to 9.

Images