Heat exchanger and refrigeration equipment

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a heat exchanger which comprises a heat exchanger body, a first heat exchanger, a second heat exchanger and a micro-channel flat pipe. The interior of the second header is divided into a plurality of second header pipe cavities through second partition plates; the bridging pipe group comprises bridging pipes communicated with two adjacent second header pipe cavities, so that the micro-channel flat pipes corresponding to the two second header pipe cavities and the bridging pipes jointly form a U-shaped refrigerant flow path; and the variable flow valve pipe group comprises a plurality of bypass pipes and a conducting component, and the variable flow valve pipe group is arranged to enable the heat exchanger main body to have two different switchable flow path states. According to the heat exchanger provided by the embodiment of the utility model, the refrigerant can be more smoothly reversed between the two groups of micro-channel flat pipes, the pipeline resistance caused by the flat pipes and the collecting pipes is reduced, the pressure loss of the refrigerant in the path changing process is reduced, and the heat exchange efficiency of the heat exchanger is improved. The invention further discloses the refrigeration equipment.

Description

Technical Field

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

[0002] From the perspective of heat exchange function, existing air conditioners can be divided into types such as single-cooling air conditioners, single-heating air conditioners, and refrigeration / heating dual-function air conditioners. Among them, the refrigeration / heating dual-function air conditioner is the mainstream model on the market at present because it can meet the two needs of summer refrigeration and winter heating. In different refrigeration and heating modes, the heat exchanger is used as an "evaporator" and a "condenser" respectively, and the flow direction of the refrigerant through the heat exchanger is opposite in different operating modes, but the number of flow paths and the length of the flow paths remain unchanged. This results in the actual heat exchange efficiency of the refrigeration / heating mode not reaching the optimal efficiency.

[0003] In view of the above situation, relevant air conditioner manufacturers apply the variable flow splitting technology to the structural design of the heat exchanger. It is achieved by the cooperation of valves such as one-way valves and on-off valves with bypass pipelines to change the refrigerant flow path of the heat exchanger in different operating modes, and can realize a flow path form with more branch flow paths when the heat exchanger is used as an "evaporator" and an extended flow path when used as a "condenser". This can greatly improve the heat exchange efficiency of the air conditioner in both refrigeration and heating modes. The variable flow splitting technology can be applied to various types of heat exchangers such as finned-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 microchannel heat exchanger applying the variable flow splitting technology in the related technology, it includes a plurality of parallel microchannel flat tubes and headers connecting the microchannel flat tubes. The refrigerant entering the microchannel heat exchanger flows through different microchannel flat tubes in sequence for continuous heat exchange. Among them, the microchannel flat tubes are generally connected perpendicular to the headers. Therefore, the refrigerant needs to undergo two 90° direction changes when changing the flow path via the headers, resulting in a relatively large pipeline resistance and causing a certain refrigerant pressure loss.

[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. Summary of the Utility Model

[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 heat exchanger and a refrigeration device, aiming to solve the technical problems in the related art that in a microchannel heat exchanger with a variable flow splitting function, the refrigerant has a large resistance and a large pressure loss when changing the flow path in different flat tubes.

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

[0010] A heat exchanger body, including a first header, a second header, and a plurality of microchannel flat tubes connected between the first header and the second header; wherein, a plurality of second header sub - cavities are formed in the second header by separating with a second partition, and each second header sub - cavity corresponds to one or more microchannel flat tubes;

[0011] A bridge pipe group, including bridge pipes communicating between two adjacent second header sub - cavities, so that the microchannel flat tubes corresponding to the two second header sub - cavities and the bridge pipes together form a U - shaped refrigerant flow path;

[0012] A variable flow valve pipe group, including a plurality of bypass pipes and a conduction component, wherein the bypass pipes are used to connect the first header and an external pipeline, and the conduction component is arranged on the bypass pipes; the variable flow valve pipe group is configured to enable the heat exchanger body to have two different switchable flow path states.

[0013] In some embodiments, the pipe type of the bridge pipe is at least one of an arc - shaped elbow or a zigzag - shaped elbow.

[0014] In some embodiments, the pipe type of the bridge pipe is an arc - shaped elbow, and the bridge pipe satisfies the following dimensional relationship:

[0015] The radius value range of the circumferential line where the bridge pipe is located is: 5.5 - 100 mm; and / or,

[0016] The radian value range of the bridge pipe is: π / 9 - π.

[0017] In some embodiments, the bridge pipe includes a connection port connecting the second header sub - cavity, and the connection port is arranged at a position adjacent to the second partition in the second header sub - cavity.

[0018] In some embodiments, the connection port is spaced from the adjacent second partition, and the spacing distance L between the connection port and the second partition satisfies the following relationship:

[0019] 2.3 mm ≤ L ≤ 200 mm.

[0020] In some embodiments, the bridge pipe and the second header satisfy the following dimensional relationship:

[0021] 0.045 ≤ d / C ≤ 0.3,

[0022] wherein, d is the outer diameter of the bridge pipe, and C is the outer perimeter of the second header.

[0023] In some embodiments, the number of bridge pipes is multiple, and two of the multiple second header cavities are connected to one bridge pipe in pairs.

[0024] In some embodiments, a plurality of first header cavities are formed in the first header by separating with a first partition, and the first header cavities are arranged in one-to-one correspondence with the second header cavities;

[0025] Among them, for two first header cavities in the same group, one is used as the liquid inlet side of the U-shaped refrigerant flow path, and the other is used as the liquid outlet side of the U-shaped refrigerant flow path.

[0026] In some embodiments, the heat exchanger body includes a first refrigerant flow path, a second refrigerant flow path, and a third refrigerant flow path arranged in sequence;

[0027] The flow conversion valve pipe group includes a first valve pipe group and a second valve pipe group, where

[0028] The first valve pipe group includes:

[0029] A first main bypass pipe, having a first main pipe end for connecting to a first external pipe and a first auxiliary pipe end for connecting to the first header;

[0030] A first conduction component, arranged on the first main bypass pipe;

[0031] A first main branch pipe, one end of which is connected to the first main pipe end and the other end is connected to the liquid inlet side of the first refrigerant flow path;

[0032] A second main branch pipe, one end of which is connected to the first auxiliary pipe end and the other end is connected to the liquid inlet side of the second refrigerant flow path;

[0033] A third main branch pipe, one end of which is connected to the first auxiliary pipe end and the other end is connected to the liquid inlet side of the third refrigerant flow path;

[0034] The second valve pipe group includes:

[0035] A second main bypass pipe, having a second main pipe end for connecting to a second external pipe and a second auxiliary pipe end for connecting to the first header;

[0036] A second conduction component, arranged on the second main bypass pipe;

[0037] A first auxiliary branch pipe, one end of which is connected to the second main pipe end and the other end is connected to the liquid outlet side of the third refrigerant flow path;

[0038] A second auxiliary branch pipe, one end of which is connected to the second auxiliary pipe end and the other end is connected to the liquid outlet side of the second refrigerant flow path;

[0039] A third auxiliary branch pipe, one end of which is connected to the second auxiliary pipe end and the other end is connected to the liquid outlet side of the first refrigerant flow path.

[0040] According to a second aspect of the present utility model, there is also provided a refrigeration device, including a device main body and a heat exchanger as shown in any embodiment of the foregoing first aspect.

[0041] The heat exchanger and the refrigeration device provided by the embodiments of the present disclosure can achieve the following technical effects:

[0042] The heat exchanger provided by the embodiments of the present disclosure uses a partition plate to divide the header into header sub-cavities communicating with different micro-channel flat tube flow paths, and uses a bridge pipe to connect two adjacent header sub-cavities to construct a U-shaped intermediate commutation flow path, so that the refrigerant can commutate more smoothly between the two groups of micro-channel flat tubes, reducing the pipeline resistance caused by the flat tubes and the headers, reducing the refrigerant pressure loss during the commutation process, enabling the refrigerant to flow and exchange heat in the heat exchanger at a faster flow rate, and improving the heat exchange efficiency of the heat exchanger.

[0043] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation 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 wherein:

[0045] Figure 1 is a schematic diagram of a heat exchanger provided by an embodiment of the present disclosure;

[0046] Figure 2 is Figure 1 a partial enlarged schematic diagram of part M in;

[0047] Figure 3 is Figure 1 a partial enlarged schematic diagram of part N in;

[0048] Figure 4 is a schematic diagram of a heat exchanger provided by another embodiment of the present disclosure;

[0049] Figure 5 is Figure 4 a partial enlarged schematic diagram of part P in;

[0050] Figure 6 is a schematic diagram of the heat exchanger provided by the embodiment of the present disclosure in the working state as a condenser;

[0051] Figure 7 is a schematic diagram of the heat exchanger provided by the embodiment of the present disclosure in the working state as an evaporator;

[0052] Figure 8It is a schematic structural diagram of a refrigeration device provided by an embodiment of the present disclosure.

[0053] Reference numerals:

[0054] 10. Heat exchanger;

[0055] 100. Heat exchanger main body; 110. First header; 111. First main pipe body; 112. First partition; 113. First header sub-chamber; 120. Second header; 121. Second main pipe body; 122. Second partition; 123. Second header sub-chamber; 130. Micro-channel flat tube;

[0056] 200. Bridge connection pipe group; 210. Bridge connection pipe; 211. Bridge connection main pipe body; 212. First connection port; 213. Second connection port;

[0057] 300. Flow conversion valve pipe group; 311. First main bypass pipe; 312. First conduction component; 313. First main branch pipe; 314. Second main branch pipe; 315. Third main branch pipe; 321. Second main bypass pipe; 322. Second conduction component; 323. First sub-branch pipe; 324. Second sub-branch pipe; 325. Third sub-branch pipe;

[0058] 40. Refrigeration device; 41. Outdoor heat exchanger. Detailed implementation manners

[0059] 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 only for reference and illustration purposes and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. 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.

[0060] The terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above-mentioned accompanying drawings are used to distinguish similar objects and do not necessarily need 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 "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0061] In the embodiments of the present disclosure, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the 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 device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, 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.

[0062] In addition, the terms "arranged", "connected", "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 is an internal connection between two devices, elements or components. 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.

[0063] Unless otherwise specified, the term "plurality" means two or more.

[0064] In the embodiments of the present disclosure, the character " / " indicates that the front and rear objects are in an "or" relationship. For example, A / B means: A or B.

[0065] The term "and / or" is an associative relationship describing an object, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B these three relationships.

[0066] 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.

[0067] This application provides a heat exchanger 10, which can be used as a heat exchange component in a refrigeration device 40, and can specifically be used to enable the refrigerant flowing through the heat exchanger 10 to exchange heat with the air in the corresponding heat exchange area of the heat exchanger 10, thereby realizing the functions of heating and raising the temperature or absorbing heat and lowering the temperature in the heat exchange area. Optionally, the type of the refrigeration device 40 includes but is not limited to air conditioners, refrigerators, freezers, dehumidifiers, etc.; correspondingly, the application form of the heat exchanger 10 includes but is not limited to being used in the functional forms of "evaporator" or "condenser".

[0068] Combined with Figures 1 to 7As shown, an embodiment of the present disclosure provides a heat exchanger 10, which at least includes a heat exchanger body 100, a bridge pipe group 200, and a variable flow valve pipe group 300. Among them, the heat exchanger body 100 includes a header and heat exchange pipes. The header is an intermediate pipe fitting for connecting the external pipeline and the heat exchange pipes. It can split the refrigerant input from the external pipeline to the heat exchange pipes, or converge the refrigerant in the heat exchange pipes and output it to the external pipeline; the heat exchange pipes are pipe fittings that directly exchange heat with the external environment of the heat exchanger 10, and the refrigerant can absorb heat or release heat to the outside through the heat conduction of the heat exchange pipes. In addition, the bridge pipe group 200 is used to connect different pipe sections of the header, thereby indirectly connecting different heat exchange pipes, so as to construct a commutation transition flow path between the heat exchange pipes. The variable flow valve pipe group 300 includes a bypass pipe and a conduction component, which are connected to different pipelines of the heat exchanger body 100, and form part or all of the pipelines of the heat exchanger body 100 into a variable flow path form, so that the heat exchanger body 100 can transport the refrigerant in different flow paths under different operating modes such as heating / cooling.

[0069] In an alternative embodiment, the heat exchanger 10 includes, but is not limited to, types such as a microchannel heat exchanger, a tube-fin heat exchanger, etc. The following embodiments will mainly be exemplarily described with the type of "microchannel heat exchanger 10".

[0070] The heat exchanger body 100 includes a first header 110, a second header 120, and a plurality of microchannel flat tubes. Among them, the tube bodies of the first header 110 and the second header 120 are arranged at intervals parallel to each other, and the interval space between the two can be used to accommodate a plurality of microchannel flat tubes. In Figure 1 and Figure 4 the illustrated embodiment, both the first header 110 and the second header 120 are arranged parallel to the vertical direction. A plurality of microchannel flat tubes are arranged side by side in parallel, and the pipe orifices on the same side of each microchannel flat tube are respectively connected to the first header 110, and the pipe orifices on the other same side are respectively connected to the second header 120. In Figure 1 and Figure 4 the illustrated embodiment, each microchannel flat tube is arranged parallel to the horizontal direction, and a plurality of microchannel flat tubes are arranged in the vertical direction.

[0071] Combined with Figure 1 and Figure 2As shown, the first header 110 includes a first main body 111 and a first partition 112. Among them, the first main body 111 is the main pipe section of the first header 110, and its internal structure has a header flow channel for refrigerant flow extending along its pipe length direction. The first partition 112 is disposed within the first main body 111, and it can separate the pipe body spaces on both sides thereof, so that two independent cavity spaces are formed within the first main body 111, and each cavity space can be used as an independent section of refrigerant flow channel respectively; here, the cavity space of the first main body 111 separated by the first partition 112 is defined as the "first sub-header cavity 113".

[0072] Optionally, the number of the first partitions 112 is one or more. For example, the number of the first partitions 112 disposed within the first main body 111 is one, and it separates the first main body 111 to form 2 first sub-header cavities 113, as Figure 2 shown; or, the number of the first partitions 112 disposed within the first main body 111 is three, and it separates the first main body 111 to form 4 first sub-header cavities 113. Here, the number of the first partitions 112 can also be set to other numbers such as two, three, five, seven, etc., and the present application does not limit this.

[0073] In the embodiment, when the number of the first partitions 112 is multiple, the multiple first partitions 112 are arranged at intervals along the pipe length direction of the first main body 111, and the first sub-header cavities 113 can be respectively formed by enclosing between two adjacent first partitions 112 and between the first partition 112 (the one closest to the pipe end) and the pipe end of the first main body 111. Optionally, the cavity lengths of each of the first sub-header cavities 113 are equal, that is, the distances between the multiple first partitions 112 and the distances between the first partition 112 and the pipe ends of the first main body 111 are all equal. Another option is that the cavity lengths of each of the sub-header cavities are not equal, that is, the distances between the multiple first partitions 112 and the distances between the first partition 112 and the pipe ends of the first main body 111 are not equal.

[0074] And, optionally, the number of the micro-channel flat tubes docked with each of the first sub-header cavities 113 is equal. For example, for the multiple first sub-header cavities 113 with equal cavity lengths shown in the previous embodiments, each of the first sub-header cavities 113 is docked with 2 (or other numbers such as three, four, etc.) micro-channel flat tubes. Another option is that the number of the micro-channel flat tubes docked with each of the first sub-header cavities 113 is not the same. For example, for the multiple first sub-header cavities 113 with unequal cavity lengths shown in the previous embodiments, the number of the micro-channel flat tubes docked with the first sub-header cavity 113 with a longer cavity length is more than the number of the micro-channel flat tubes docked with the first sub-header cavity 113 with a shorter cavity length.

[0075] In an embodiment, the overall outer contour of the first main body 111 of the first header 110 is a straight tube, and its cross-sectional shape is circular, square, elliptical, etc. Correspondingly, the shape of the first partition 112 is adapted to the cross-sectional shape of the first main body 111. The first partition 112 is assembled inside the first main body 111 with its plate surface perpendicular to the axis of the first main body 111, and the outer peripheral edge of the first partition 112 abuts and seals against the inner pipe wall of the first main body 111. Optionally, the first main body 111 and the first partition 112 are fixed by welding, gluing or other means.

[0076] Similarly, in combination with Figure 1 and Figure 3 As shown, the second header 120 includes a second main body 121 and a second partition 122. Among them, the second main body 121 is the main pipe section part of the second header 120, and its internal structure has a header flow channel for refrigerant flow extending along its pipe length. The second partition 122 is arranged inside the second main body 121, and it can separate the pipe space on both sides of it, so that two independent cavity spaces are formed inside the second main body 121, and each cavity space can be used as an independent section of refrigerant flow channel respectively; here, the cavity space of the second main body 121 separated by the second partition 122 is defined as the "second sub-header cavity 123". Optionally, the respective structures of the second main body 121 and the second partition 122 and the cooperation form between the two can refer to the forms of the first main body 111 and the first partition 112 shown in the previous embodiment, which will not be elaborated here.

[0077] In one embodiment, the pipe lengths of the first header 110 and the second header 120 are equal, and the positions of the two pipe ends also correspond to each other. For example, the top pipe sections of the first header 110 and the second header 120 are at the same vertical height, and the bottom pipe sections are also at the same vertical height. In another embodiment, the pipe lengths of the first header 110 and the second header 120 are not equal. For example, the pipe length of the first header 110 is greater than the pipe length of the second header 120, or the pipe length of the first header 110 is less than the pipe length of the second header 120.

[0078] In some other optional embodiments, the first sub-header cavities 113 and the second sub-header cavities 123 are arranged in one-to-one correspondence, that is, the numbers of the first sub-header cavities 113 and the second sub-header cavities 123 respectively opened on the first header 110 and the second header 120 are equal and their positions relative to their respective headers are also consistent; each first sub-header cavity 113 and its corresponding second sub-header cavity 123 are connected to the same group of micro-channel flat tubes, and this group of micro-channel flat tubes includes one or more micro-channel flat tubes.

[0079] In Figure 1 and Figure 4In the illustrated embodiment, the first header 110 is a header directly connected to the external pipeline, and the second header 120 is not directly connected to the external pipeline. After the refrigerant flows from the first header 110 into the microchannel flat tube, it needs to be commutated to other microchannel flat tubes via the second header 120 on the other side before it can flow back to the first header 110. Therefore, in order to reduce the tube resistance and pressure loss during the commutation process, the bridge tube assembly 200 of the disclosed embodiment is assembled on the second header 120, which can connect two adjacent second header sub-cavities 123 of the second header 120, and make the microchannel flat tubes corresponding to the two second header cavities 123 and the bridge tube 210 together form a U-shaped refrigerant flow path, such as Figure 3 In this way, the refrigerant is commutated along the U-shaped refrigerant flow path from the microchannel flat tube corresponding to one second header sub-cavity 123 to the microchannel flat tube corresponding to another second header sub-cavity 123, which can achieve smoother reversal of the refrigerant, and the refrigerant can flow and exchange heat in the heat exchanger 10 at a faster flow rate, effectively improving the heat exchange efficiency of the heat exchanger 10.

[0080] In some embodiments, the pipe type of the bridging pipe 210 is at least one of an arc-shaped curved pipe and a zigzag curved pipe.

[0081] Optionally, the bridge tube 210 is a regular curved tube, for example, the entire tube section of the bridge tube 210 is formed by extending along the same curvature curve; another option is that the bridge tube 210 is an irregular curved tube, for example, the entire tube section of the bridge tube 210 is composed of multiple curved tube sections connected in sequence, and different curved tube sections are respectively extended along different curvature curves. Figure 3 In the illustrated embodiment, the bridge tube 210 is in the form of a regular curved tube.

[0082] exist Figure 3 In the embodiment, the radius R of the circumference of the bridge tube 210 is in the range of 5.5 to 100 mm. The specific value of the radius R of the circumference of the bridge tube 210 can be selected according to the model of the heat exchanger 10 and the size of the header and the microchannel flat tube, such as 5.5 mm, 10 mm, 20 mm, 45 mm, 75 mm, 100 mm, etc.

[0083] In some other embodiments, the bridge tube 210 is in the form of a regular curved tube, and the value range of its radian rad is: π / 9 to π. Here, the specific value of the radian of the bridge tube 210 can be selected according to the pipe diameter of the header, the pipe length of the second header sub-cavity 123 and other parameters. Optionally, the specific value of the radian rad of the bridge tube 210 is π / 9, π / 6, π / 3, π / 2, π / 2, 2π / 3, 2π / 3, 5π / 6, π, and so on.

[0084] In still other embodiments, the bridging pipe 210 is in the form of a broken-line elbow formed by sequentially connecting two or more straight pipe segments. For example, the number of straight pipe segments is two, and the two diameter pipe segments are arranged at an angle to form an approximate V shape. The angle can be an acute angle, a right angle, or an obtuse angle.

[0085] In some embodiments, the pipe diameter of the bridging pipe 210 is substantially the same as that of the second header 120. For example, the pipe diameter of the bridging pipe 210 is equal to that of the second header 120. This can ensure that the cross-sectional area of the flow path does not change significantly when the refrigerant flows between the second header 120 and the bridging pipe 210, providing smoothness of refrigerant flow and reducing problems such as turbulence and eddy current.

[0086] In still other embodiments, the bridging pipe 210 and the second header 120 satisfy the following dimensional relationship: 0.045 ≤ d / C ≤ 0.3, where d is the outer diameter of the bridging pipe 210 and C is the outer perimeter of the second header 120. Exemplarily, for a certain model of heat exchanger 10, the outer perimeter of the second header 120 is 50 mm, then the value range of the outer diameter of the bridging pipe 210 is 2.25 - 15 mm. For example, it can take values such as 2.25 mm, 5 mm, 7 mm, 12 mm, or 15 mm, etc.

[0087] Through testing, by adopting the above dimensional relationship between the bridging pipe 210 and the second header 120, the dual effects of reducing refrigerant pressure loss and increasing refrigerant flow rate can be taken into account, which is beneficial to enhancing the heat transfer performance of the heat exchanger 10.

[0088] In the foregoing multiple embodiments, in combination Figure 3 As shown, the bridging pipe 210 includes a bridging main body 211 and connection ports. The connection ports include a first connection port 212 and a second connection port 213, and the two connection ports can be respectively used to connect to the corresponding second header sub-chambers 123.

[0089] In an embodiment, the first connection port 212 is connected to a position of the second header sub-chamber 123 adjacent to the second partition 122. For example Figure 3 In the bridging pipe 210(Ⅰ) shown, the first connection port 212 is its upper port (a), the second connection port 213 is its lower port (a’), and its first connection port 212 is located at the position of the lower partition b1 of its corresponding second header sub-chamber 123. In this way, in this embodiment, since the second header sub-chamber 123 (second header 120) is arranged in the vertical direction, the refrigerant is easily accumulated at the bottom position of the second header sub-chamber 123 under the action of gravity. As the first connection port 212 serving as the liquid inlet side is arranged at a position adjacent to the second partition 122, the refrigerant can flow into the bridging pipe 210 more easily, reducing the retention of the refrigerant.

[0090] Another alternative is, in combinationFigure 3 As shown, the second connection port 213 of the bridge connection pipe 210 (Ⅰ) is located at the lower partition b2 of its corresponding second collector sub-chamber 123. In this embodiment, the second connection port 213 serves as the liquid outlet side port of the bridge connection pipe 210. By setting the second connection port 213 at a position close to the second partition 122 of its corresponding collector sub-chamber, the refrigerant can be better divided into the multiple micro-channel flat tubes corresponding to the second collector sub-chamber 123, improving the uniformity of refrigerant flow division and heat exchange.

[0091] In some embodiments, the connection ports (the first connection port 212 and / or the second connection port 213) of the bridge connection pipe 210 are spaced apart from the second partition 122 of its corresponding collector sub-chamber, and the spacing distance L between the two satisfies the relationship: 2.3 mm ≤ L ≤ 200 mm, as Figure 5 shown. Exemplarily, the value of the spacing distance L is 2.3 mm, 5 mm, 10 mm, 20 mm, 50 mm, 100 mm, 130 mm, 160 mm, 200 mm, and so on.

[0092] In the foregoing multiple embodiments, the number of bridge connection pipes 210 is multiple, and multiple second collector sub-chambers 123 are connected to one bridge connection pipe 210 in pairs. As Figure 4 shown in the second collector 120, there are a total of 6 second collector sub-chambers 123, numbered B1, B2,..., B6 from top to bottom. Among them, the second collector sub-chambers B1 and B2 form a U-shaped refrigerant flow path with the corresponding bridge connection pipe 210 (Ⅰ); and so on, the second collector sub-chambers B3 and B4 form another U-shaped refrigerant flow path with the corresponding bridge connection pipe 210 (Ⅱ); the second collector sub-chambers B5 and B6 form another U-shaped refrigerant flow path with the corresponding bridge connection pipe 210 (Ⅲ). In this way, each refrigerant flow path does not interfere with each other, and the refrigerant commutation and external heat exchange functions can be realized separately.

[0093] Moreover, in combination with the foregoing embodiments, since the first collector sub-chambers 113 and the second collector sub-chambers 123 are provided in one-to-one correspondence, the first collector sub-chambers 113 corresponding to the two second collector sub-chambers 123 in the same group are also set in the same group. As Figure 4 shown in the first collector 110, there are also 6 first collector sub-chambers 113, numbered A1, A2,..., A6 from top to bottom. Among them, A1 and A2 are in the same group, A3 and A4 are in the same group, A5 and A6 are in the same group, and so on.

[0094] Meanwhile, the first header 110 is a header for connecting external pipelines, where the external pipelines include a first external pipeline and a second external pipeline. The first external pipeline is used to input refrigerant into the heat exchanger body 100, and the second external pipeline is used for the heat exchanger body 100 to output refrigerant to it. Therefore, in order to realize the refrigerant input and output of each first header sub-chamber 113, for the two first header sub-chambers 113 in the same group, one is used as the liquid inlet side of the U-shaped refrigerant flow path, and the other is used as the liquid outlet side of the U-shaped refrigerant flow path. For example, for the first header sub-chambers 113 of A1 and A2, when the heat exchanger 10 is used as an "evaporator", A1 is used as the liquid inlet side and A2 is used as the liquid outlet side; or, when the heat exchanger 10 is used as a "condenser", A1 is used as the liquid outlet side and A2 is used as the liquid inlet side.

[0095] In some alternative embodiments, the flow control valve pipe group 300 includes a plurality of bypass pipes and conducting components, where the bypass pipes are used to connect the first header 110 and the external pipelines, and the conducting components are arranged on the bypass pipes; the flow control valve pipe group 300 is configured to enable the heat exchanger body 100 to have two different switchable flow path states.

[0096] In an embodiment, the heat exchanger body 100 includes a first refrigerant flow path, a second refrigerant flow path, and a third refrigerant flow path arranged in sequence. Exemplarily, the first refrigerant flow path is a U-shaped refrigerant flow path composed of the first header sub-chambers 113 (A1, A2) and the second header sub-chambers 123 (B1, B2) and their corresponding flat pipes and bridge pipes 210 (Ⅰ); and, the first refrigerant flow path is a U-shaped refrigerant flow path composed of the first header sub-chambers 113 (A3, A4) and the second header sub-chambers 123 (B3, B4) and their corresponding flat pipes and bridge pipes 210 (Ⅱ); the first refrigerant flow path is a U-shaped refrigerant flow path composed of the first header sub-chambers 113 (A5, A6) and the second header sub-chambers 123 (B5, B6) and their corresponding flat pipes and bridge pipes 210 (Ⅲ).

[0097] And, the flow control valve group includes a first valve pipe group and a second valve pipe group. Among them, when the heat exchanger 10 is used as an "evaporator", the first valve pipe group is used as the flow path pipe group for the refrigerant to flow into the heat exchanger 10, and the second valve pipe group is used as the flow path pipe group for the refrigerant to flow out of the heat exchanger 10; when the heat exchanger 10 is used as a "condenser", the first valve pipe group is used as the flow path pipe group for the refrigerant to flow out of the heat exchanger 10, and the second valve pipe group is used as the flow path pipe group for the refrigerant to flow into the heat exchanger 10.

[0098] Specifically, the first valve pipe group includes a first main bypass pipe 311, a first conducting component 312, a first main branch pipe 313, a second main branch pipe 314, and a third main branch pipe 315. Combining Figure 4As shown, the first main bypass pipe 311 has a first main pipe end for connecting to the first external pipe and a first auxiliary pipe end for connecting to the first header 110; the first conduction component 312 is arranged on the first main bypass pipe 311; one end of the first main branch pipe 313 communicates with the first main pipe end, and the other end communicates with the liquid inlet side of the first refrigerant flow path, for example Figure 4 is connected to the first header sub-cavity 113(A1) in Figure 4 ; one end of the second main branch pipe 314 communicates with the first auxiliary pipe end, and the other end communicates with the liquid inlet side of the second refrigerant flow path, for example Figure 4 is connected to the first header sub-cavity 113(A4) in Figure 4 ; one end of the third main branch pipe 315 communicates with the first auxiliary pipe end, and the other end communicates with the liquid inlet side of the third refrigerant flow path, for example Figure 4 is connected to the first header sub-cavity 113(A5) in Figure 4 .

[0099] In this embodiment, the first conduction component 312 is a one-way conduction valve or a control valve. Optionally, the first conduction component 312 is a one-way conduction valve, and its conduction direction is configured in a one-way conduction form that conducts when the refrigerant flows from the first main pipe end to the first auxiliary pipe end and blocks when flowing from the first auxiliary pipe end to the first main pipe end. Another option is that the first conduction component 312 is a control valve, and its configuration is in an on-off control form that opens when the refrigerant flows from the first main pipe end to the first auxiliary pipe end and closes when flowing from the first auxiliary pipe end to the first main pipe end.

[0100] And, the second valve pipe group includes a second main bypass pipe 321, a second conduction component 322, a first auxiliary branch pipe 323, a second auxiliary branch pipe 324 and a third auxiliary branch pipe 325. Combining Figure 4 As shown, the second main bypass pipe 321 has a second main pipe end for connecting to the second external pipe and a second auxiliary pipe end for connecting to the first header 110; the second conduction component 322 is arranged on the second main bypass pipe 321; one end of the first auxiliary branch pipe 323 communicates with the second main pipe end, and the other end communicates with the liquid outlet side of the third refrigerant flow path, for example Figure 4 is connected to the first header sub-cavity 113(A6) in Figure 4 ; one end of the second auxiliary branch pipe 324 communicates with the second auxiliary pipe end, and the other end communicates with the liquid outlet side of the second refrigerant flow path, for example Figure 4 is connected to the first header sub-cavity 113(A3) in Figure 4 ; one end of the third auxiliary branch pipe 325 communicates with the second auxiliary pipe end, and the other end communicates with the liquid outlet side of the first refrigerant flow path, for example Figure 4 is connected to the first header sub-cavity 113(A2) in Figure 4 .

[0101] Similarly, the second conducting component 322 is a one-way conducting valve or a control valve. Optionally, the second conducting component 322 is a one-way conducting valve, and its conducting direction is configured in a one-way conducting form that blocks when the refrigerant flows from the second main pipe end to the second sub-pipe end and conducts when the refrigerant flows from the second sub-pipe end to the second main pipe end. Another option is that the second conducting component 322 is a control valve, and its configuration is a on-off control form that closes when the refrigerant flows from the second main pipe end to the second sub-pipe end and opens when the refrigerant flows from the second sub-pipe end to the second main pipe end.

[0102] Thus, when the heat exchanger 10 is used as an evaporator, as Figure 6 shown, the refrigerant flows through each refrigerant flow path from top to bottom in the direction indicated by the arrow. The heat exchanger 10 has a large number of branch flow paths, thereby enhancing the evaporation heat absorption effect on the liquid refrigerant. And when the heat exchanger 10 is used as a condenser, as Figure 7 shown, the refrigerant flows through each refrigerant flow path from bottom to top in the direction indicated by the arrow. The actual number of branch flow paths of the heat exchanger 10 decreases and the refrigerant flow path extends, thereby improving the condensation effect on the gaseous refrigerant.

[0103] In some other embodiments, the present application also discloses a refrigeration device 40. Optionally, the type of the refrigeration device 40 includes but is not limited to air conditioners, refrigerators, freezers, etc.

[0104] Specifically, the refrigeration device 40 includes a device main body and the heat exchanger 10 shown in the foregoing embodiments. Here, taking the refrigeration device 40 as an air conditioner as an example, the above heat exchanger 10 may be the outdoor heat exchanger 41 of its outdoor unit, as Figure 8 shown, and / or the indoor heat exchanger 10 of its indoor unit. The refrigeration device 40 adopts the heat exchanger 10 shown in the foregoing embodiments. The refrigerant flows at a high rate and has a small pressure loss in different refrigerant flow paths of the heat exchanger 10, and the heat exchange efficiency of the heat exchanger 10 and the operating performance of the refrigeration device 40 can be significantly improved.

[0105] 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. The embodiments only represent possible variations. Unless explicitly required, the individual components and functions are optional, and the order of operations can vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above 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 only limited by the appended claims.

Claims

1. A heat exchanger, characterized in that: include: A heat exchanger body (100) comprises a first header (110), a second header (120), and a plurality of microchannel flat tubes (130) connected between the first header (110) and the second header (120); wherein the second header (120) is divided into a plurality of second header sub-cavities (123) by a second partition (122), and each second header sub-cavity (123) corresponds to one or more microchannel flat tubes (130); The bridge tube group (200) comprises a bridge tube (210) connected to two adjacent second header sub-cavities (123), so that the microchannel flat tubes (130) corresponding to the two second header sub-cavities (123) and the bridge tube (210) together form a U-shaped refrigerant flow path; The variable valve tube group (300) comprises a plurality of bypass tubes and conducting components, wherein the bypass tubes are used to connect the first header (110) and the external pipeline, and the conducting components are arranged on the bypass tubes; the variable valve tube group (300) is arranged to enable the heat exchanger body (100) to have two different switchable flow path states.

2. The heat exchanger according to claim 1, characterized in that: The pipe type of the bridge pipe (210) is at least one of an arc-shaped curved pipe and a zigzag curved pipe.

3. The heat exchanger according to claim 2, characterized in that: The bridge tube (210) is an arc-shaped curved tube, and the bridge tube (210) satisfies the following dimensional relationship: The radius of the circle where the bridge tube (210) is located is in the range of 5.5 to 100 mm; and / or, The radian of the bridge tube (210) ranges from π / 9 to π.

4. The heat exchanger according to claim 1, characterized in that: The bridge pipe (210) includes a pipe port communicating with the second header sub-cavity (123), and the pipe port is arranged at a position of the second header sub-cavity (123) adjacent to the second partition plate (122).

5. The heat exchanger according to claim 4, characterized in that: The pipe port is spaced apart from the adjacent second partition plate (122), and the spacing distance L between the pipe port and the second partition plate (122) satisfies the following relationship: 2.3mm≤L≤200mm.

6. The heat exchanger according to claim 1, characterized in that The bridge tube (210) and the second header (120) satisfy the following size relationship: 0.045≤d / C≤0.3, Wherein, d is the outer diameter of the bridge tube (210), and C is the outer circumference of the second header (120).

7. The heat exchanger according to claim 1, characterized in that There are a plurality of bridge tubes (210), and a plurality of second header sub-cavities (123) are connected to a bridge tube (210) in groups of two.

8. The heat exchanger according to claim 7, characterized in that A plurality of first header sub-cavities (113) are formed in the first header (110) by partitioning with a first partition plate (112), and the first header sub-cavities (113) and the second header sub-cavities (123) are arranged in one-to-one correspondence; Among them, one of the two first header chambers (113) in the same group serves as the liquid inlet side of the U-shaped refrigerant flow path, and the other serves as the liquid outlet side of the U-shaped refrigerant flow path.

9. The heat exchanger according to any one of claims 1 to 8, characterized in that: The heat exchanger body (100) comprises a first refrigerant flow path, a second refrigerant flow path and a third refrigerant flow path which are arranged in sequence; The variable flow valve tube group (300) comprises a first valve tube group and a second valve tube group, wherein: The first valve pipe group includes: A first main bypass pipe (311) having a first main pipe end for connecting to a first external pipeline and a first auxiliary pipe end for connecting to a first header (110); A first conducting component (312) is arranged on the first main bypass pipe (311); A first main branch pipe (313), one end of which is connected to the first main pipe end, and the other end of which is connected to the liquid inlet side of the first refrigerant flow path; A second main branch pipe (314), one end of which is connected to the first auxiliary pipe end, and the other end of which is connected to the liquid inlet side of the second refrigerant flow path; A third main branch pipe (315), one end of which is connected to the first auxiliary pipe end, and the other end of which is connected to the liquid inlet side of the third refrigerant flow path; The second valve pipe group includes: A second main bypass pipe (321) having a second main pipe end for connecting to a second external pipeline and a second secondary pipe end for connecting to the first header (110); A second conducting component (322) is disposed on the second main bypass pipe (321); A first auxiliary branch pipe (323), one end of which is connected to the second main pipe end, and the other end of which is connected to the liquid outlet side of the third refrigerant flow path; A second auxiliary branch pipe (324), one end of which is connected to the second auxiliary pipe end, and the other end of which is connected to the liquid outlet side of the second refrigerant flow path; The third auxiliary branch pipe (325) has one end connected to the second auxiliary pipe end and the other end connected to the liquid outlet side of the first refrigerant flow path.

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

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