Variable shunting heat exchanger and air conditioning system

Abstract

The utility model relates to the technical field of air conditioners, and discloses a variable shunting heat exchanger which comprises a first heat exchange module. The first heat exchange module comprises a first collecting pipe assembly, a first heat exchange pipe set and a first flow path switching assembly. The first header assembly comprises a first air pipe and a first liquid pipe, the first heat exchange pipe set comprises a plurality of heat exchange branches, and the first flow path switching assembly is arranged on the first header assembly and used for switching communication modes of at least part of the heat exchange branches in the first heat exchange pipe set in different operation modes. Wherein the first heat exchange pipe set comprises a first heat exchange branch, a second heat exchange branch and a first confluence heat exchange branch, one end of the first heat exchange branch and one end of the second heat exchange branch both communicate with the first air pipe, and the other end of the first heat exchange branch and the other end of the second heat exchange branch both communicate with the first confluence heat exchange branch; the first confluence heat exchange branch communicates with the first liquid pipe. The utility model further provides an air conditioning system.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, for example, to a variable split heat exchanger and an air conditioning system. Background Art

[0002] The air conditioning system generally consists of a compressor, an outdoor heat exchanger, a throttling device, a four-way valve and an indoor heat exchanger to form a refrigerant circulation loop, and the four-way valve changes the flow direction of the refrigerant in the refrigerant circulation loop, thereby realizing the cooling function and heating function respectively. Among them, the indoor heat exchanger and the outdoor heat exchanger are important structural components of the air conditioning system, and the heat exchange capacity of the heat exchanger is directly related to the cooling capacity or heating capacity of the air conditioning system.

[0003] The existing variable split-flow heat exchanger can change the connection mode between different heat exchange branches of the heat exchanger so that the heat exchanger has a better heat exchange capacity in both cooling mode and heating mode.

[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 art:

[0005] When the existing heat exchanger is used as an evaporator, the refrigerant distribution amount between different heat exchange branches is different, which reduces the heat exchange capacity of the heat exchanger.

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

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The disclosed embodiments provide a variable split flow heat exchanger and an air conditioning system to solve the problem that different refrigerant distribution amounts in different heat exchange branches of the heat exchanger affect the heat exchange efficiency of the heat exchanger.

[0009] In some embodiments, the variable split heat exchanger includes a first heat exchange module, which includes: a first manifold assembly, including a first air pipe and a first liquid pipe; a first heat exchange tube group, including multiple heat exchange branches; and a first flow path switching assembly, which is arranged on the first manifold assembly and is used to switch the connection mode of at least part of the heat exchange branches in the first heat exchange tube group under different operating modes, wherein the first heat exchange tube group includes a first heat exchange branch, a second heat exchange branch and a first converging heat exchange branch, and one end of the first heat exchange branch and the second heat exchange branch are both connected to the first air pipe, the other ends of the first heat exchange branch and the second heat exchange branch are both connected to the first converging heat exchange branch, and the first converging heat exchange branch is connected to the first liquid pipe.

[0010] In some optional embodiments, the number of heat exchange tubes in the first heat exchange branch is greater than or equal to the number of heat exchange tubes in the first converging heat exchange branch; and / or, the number of heat exchange tubes in the second heat exchange branch is greater than or equal to the number of heat exchange tubes in the first converging heat exchange branch; and / or, the sum of the numbers of heat exchange tubes in the first heat exchange branch and the second heat exchange branch is greater than the number of heat exchange tubes in the first converging heat exchange branch; and / or, the number of heat exchange tubes in the first heat exchange branch is greater than or equal to the number of heat exchange tubes in the second heat exchange branch.

[0011] In some optional embodiments, the number of rows of heat exchange tubes in the first heat exchange branch is greater than or equal to the number of rows of heat exchange tubes in the first converging heat exchange branch; and / or, the number of rows of heat exchange tubes in the second heat exchange branch is greater than or equal to the number of rows of heat exchange tubes in the first converging heat exchange branch; and / or, the number of rows of heat exchange tubes in the first heat exchange branch and the second heat exchange branch are both greater than or equal to 2 rows, and the number of rows of heat exchange tubes in the first converging heat exchange branch is greater than or equal to 1 row.

[0012] In some optional embodiments, the first converging heat exchange branch includes a first converging end connected to the first heat exchange branch and the second heat exchange branch, and a second converging end connected to the first liquid pipe, wherein in the vertical direction, the first converging end is located above the second converging end; and / or, the first converging heat exchange branch includes a first converging heat exchange tube directly connected to the first heat exchange branch and the second heat exchange branch, and a second converging heat exchange tube directly connected to the first liquid pipe, wherein in the vertical direction, the first converging heat exchange tube is located above the second converging heat exchange tube.

[0013] In some optional embodiments, the first flow path switching component includes: a first conductive component, which is connected to the first air pipe; and a second conductive component, which is connected to the first liquid pipe, wherein the first heat exchange branch and the second heat exchange branch are connected to the side of the conductive outflow end of the first conductive component of the first air pipe, and the first converging heat exchange branch is connected to the side of the conductive outflow end of the second conductive component of the first liquid pipe.

[0014] In some optional embodiments, the first heat exchange tube group also includes: a third heat exchange branch, one end of which is connected to the side of the conductive inlet end of the first conductive component of the first gas pipe, and the other end is connected to the side of the conductive outflow end of the second conductive component of the first liquid pipe; and a fourth heat exchange branch, one end of which is connected to the side of the conductive inlet end of the first conductive component of the first gas pipe, and the other end is connected to the side of the conductive inlet end of the second conductive component of the first liquid pipe.

[0015] In some optional embodiments, the variable split heat exchanger also includes a second heat exchange module, which is arranged at the bottom of the first heat exchange module, and the second heat exchange module includes: a second manifold assembly, including a second air pipe and a second liquid pipe; a second heat exchange tube group, including a plurality of heat exchange branches; and a second flow path switching assembly, which is arranged in the second manifold assembly, and is used to switch the connection mode of at least part of the heat exchange branches in the second heat exchange tube group under different operating modes, wherein the second heat exchange tube group includes a fifth heat exchange branch, a sixth heat exchange branch and a second converging heat exchange branch, and one end of the fifth heat exchange branch and the sixth heat exchange branch are both connected to the second air pipe, the other end of the fifth heat exchange branch and the sixth heat exchange branch are both connected to the second converging heat exchange branch, and the second converging heat exchange branch is connected to the second liquid pipe.

[0016] In some optional embodiments, the second flow path switching component includes: a third conductive component, which is connected to the second air pipe; and a fourth conductive component, which is connected to the second liquid pipe, wherein the fifth heat exchange branch and the sixth heat exchange branch are connected to the side of the conductive outflow end of the third conductive component of the second air pipe, and the second converging heat exchange branch is connected to the side of the conductive outflow end of the fourth conductive component of the second liquid pipe.

[0017] In some optional embodiments, the second heat exchange tube group also includes: a seventh heat exchange branch, one end of which is connected to the side of the conductive inlet end of the third conductive component of the second air pipe, and the other end is connected to the side of the conductive outflow end of the fourth conductive component of the second liquid pipe; and an eighth heat exchange branch, one end of which is connected to the side of the conductive inlet end of the third conductive component of the second air pipe, and the other end is connected to the side of the conductive inlet end of the fourth conductive component of the second liquid pipe.

[0018] In some embodiments, an air conditioning system includes a variable split heat exchanger as described above.

[0019] The variable split flow heat exchanger and air conditioning system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] The embodiment of the present disclosure provides a variable split heat exchanger, including a first heat exchange module. The first heat exchange module includes a first header assembly, a first heat exchange tube group and a first flow path switching assembly. The first header assembly includes a first air pipe and a first liquid pipe, and the first heat exchange tube group includes a plurality of heat exchange branches, and the plurality of heat exchange branches are connected between the first air pipe and the first liquid pipe. The first flow path switching assembly is used to switch the connection mode of at least part of the heat exchange branches, so that the connection mode of the heat exchange branches in the first heat exchange tube group conforms to the current operation mode of the air conditioning system.

[0021] Among them, the first heat exchange tube group includes a first heat exchange branch, a second heat exchange branch and a first converging heat exchange branch, and one end of the first heat exchange branch and the second heat exchange branch are both connected to the first air pipe, the other ends of the first heat exchange branch and the second heat exchange branch are both connected to the first converging heat exchange branch, and the first converging heat exchange branch is connected to the first liquid pipe.

[0022] It can be seen that in the variable flow split heat exchanger provided in the embodiment of the present disclosure, the first heat exchange branch and the second heat exchange branch are connected to the first liquid pipe through the first converging heat exchange branch. In this way, when the variable flow split heat exchanger is used as an evaporator, the refrigerant flowing out of the first liquid pipe flows through the first converging heat exchange branch and then flows into the first heat exchange branch and the second heat exchange branch, thereby improving the uniformity of the refrigerant distribution of the first heat exchange branch and the second heat exchange branch.

[0023] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0025] Figure 1 is a schematic diagram of a first heat exchange module provided in an embodiment of the present disclosure;

[0026] Figure 2 yes Figure 1 A magnified view of a selected portion;

[0027] Figure 3 is a schematic diagram of refrigerant flow when a first heat exchange module provided by an embodiment of the present disclosure is used as a condenser;

[0028] Figure 4 is a schematic diagram of refrigerant flow when a first heat exchange module provided by an embodiment of the present disclosure is used as an evaporator;

[0029] Figure 5 is a schematic diagram of a second heat exchange module provided in an embodiment of the present disclosure;

[0030] Figure 6 It is a schematic diagram of a variable split heat exchanger provided in an embodiment of the present disclosure.

[0031] Reference numerals:

[0032] 100: gas collecting main pipe; 101: first branch pipe; 102: second branch pipe; 103: third branch pipe; 11: first gas pipe; 111: first conducting component; 12: first liquid pipe; 121: second conducting component;

[0033] 21: first heat exchange branch; 211: first confluence heat exchange branch; 2111: first confluence end; 2112: second confluence end; 2113: first confluence heat exchange tube; 2114: second confluence heat exchange tube; 22: second heat exchange branch; 23: third heat exchange branch; 24: fourth heat exchange branch;

[0034] 31: second air pipe; 311: third conducting component; 32: second liquid pipe; 321: fourth conducting component;

[0035] 41: fifth heat exchange branch; 411: second converging heat exchange branch; 42: sixth heat exchange branch; 43: seventh heat exchange branch; 44: eighth heat exchange branch;

[0036] 50: Subcooling pipeline;

[0037] 60: Liquid dispensing element. DETAILED DESCRIPTION

[0038] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full 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, to simplify the drawings, well-known structures and devices can be simplified for display.

[0039] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. 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.

[0041] In addition, the terms "disposed", "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 a direct connection, or an indirect connection through an intermediate medium, or it can be 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 the specific circumstances.

[0042] Unless otherwise stated, the term "plurality" means two or more.

[0043] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0044] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0046] An embodiment of the present disclosure provides a variable split heat exchanger.

[0047] Optionally, the variable split heat exchanger includes a first heat exchange module, which includes a first header assembly, a first heat exchange tube group and a first flow path switching assembly. The first header assembly includes a first gas pipe 11 and a first liquid pipe 12, the first heat exchange tube group includes a plurality of heat exchange branches, and the first flow path switching assembly is arranged on the first header assembly, and is used to switch the connection mode of at least part of the heat exchange branches in the first heat exchange tube group under different operation modes. Among them, the first heat exchange tube group includes a first heat exchange branch 21, a second heat exchange branch 22 and a first converging heat exchange branch 211, and one end of the first heat exchange branch 21 and the second heat exchange branch 22 are both connected to the first gas pipe 11, the other ends of the first heat exchange branch 21 and the second heat exchange branch 22 are both connected to the first converging heat exchange branch 211, and the first converging heat exchange branch 211 is connected to the first liquid pipe 12.

[0048] When the variable split heat exchanger is used as an evaporator, the multiple heat exchange branches in the first heat exchange tube group are connected in parallel. At this time, the first liquid pipe 12 performs refrigerant liquid separation so that the refrigerant flows into different heat exchange branches respectively. In this connected state, different heat exchange branches are prone to different refrigerant distribution amounts, especially when the overall height of the variable split heat exchanger is high, and most of the heat exchange tubes are arranged in a vertical regular pattern. In this way, the refrigerant in the first liquid pipe 12 has an upward impulse, flow pressure, gravity and other factors during the flow process, which makes the first liquid pipe 12 unevenly distribute the refrigerant between different heat exchange branches, and even under the same operating load, the same heat exchange branch has different refrigerant amounts distributed twice, thereby reducing the heat exchange efficiency of the variable split heat exchanger.

[0049] In the existing heat exchanger, the first heat exchange branch 21 and the second heat exchange branch 22 of the first heat exchange module are directly connected to the first liquid pipe 12, respectively, and are connected to different positions of the first liquid pipe 12. Since the first liquid pipe 12 is prone to uneven refrigerant distribution, there is a difference in the amount of refrigerant allocated to the first heat exchange branch 21 and the second heat exchange branch 22, and there is also a difference in the refrigerant distribution amount of other heat exchange branches of the first heat exchange module.

[0050] In the variable split heat exchanger provided in the embodiment of the present disclosure, the refrigerant in the first liquid pipe 12 first flows through the first converging heat exchange branch 211, and then flows into the first heat exchange branch 21 and the second heat exchange branch 22 respectively through the first converging heat exchange branch 211. In this way, the uniformity of the amount of refrigerant distributed to the first heat exchange branch 21 and the second heat exchange branch 22 is improved, and at the same time, the uniformity of the refrigerant distribution amount with other heat exchange branches is also improved, thereby improving the overall heat exchange effect of the heat exchanger.

[0051] The first flow path switching component is used to switch the connection mode of at least some of the different heat exchange branches in the first heat exchange tube group under different operating modes. The first flow path switching component can form different connection modes between the heat exchange branches. For example, when the air-conditioning system operates in the cooling mode and the variable split heat exchanger is used as a condenser, at least some of the heat exchange branches in the first heat exchange tube group are connected in series. When the air-conditioning system operates in the heating mode and the variable split heat exchanger is used as an evaporator, at least some of the heat exchange branches in the first heat exchange tube group are connected in parallel. In this way, the first flow path switching component enables the variable split heat exchanger to have the optimal flow path under different operating modes, thereby improving the heat exchange efficiency of the heat exchanger.

[0052] Optionally, the first flow path switching component may be a conducting component with a one-way conducting function, or a combination of a valve component and a pipe component with a one-way conducting function. For example, the first flow path switching component may be a combination of a manifold and a valve component, or a combination of a bypass pipe and a valve component, etc. Optionally, the conducting component with a one-way conducting function includes a one-way valve, a solenoid valve, and a one-way conducting slider, a baffle, and other structural members that perform one-way conducting.

[0053] Optionally, the first converging heat exchange branch 211 includes one or more heat exchange tubes with the same specifications as the first heat exchange branch 21 and the second heat exchange branch 22. It can be understood that the first converging heat exchange branch 211 also performs a heat exchange function.

[0054] Optionally, the number of heat exchange tubes in the first heat exchange branch 21 is greater than or equal to the number of heat exchange tubes in the first converging heat exchange branch 211; and / or the number of heat exchange tubes in the second heat exchange branch 22 is greater than or equal to the number of heat exchange tubes in the first converging heat exchange branch 211.

[0055] The number of heat exchange tubes in the first converging heat exchange branch 211 does not need to be too large, as long as uniform liquid separation can be achieved. Optionally, the number of heat exchange tubes in the first converging heat exchange branch 211 can be 1-6, for example, the number of heat exchange tubes in the first converging heat exchange branch 211 can be 4. Figure 1 As shown. Optionally, the number of heat exchange tubes in the first heat exchange branch 21 is greater than or equal to the number of heat exchange tubes in the first converging heat exchange branch 211, so that the first heat exchange branch 21 can better exert the heat exchange effect. Optionally, the number of heat exchange tubes in the first heat exchange branch 21 can be 4-12. For example, the number of heat exchange tubes in the first heat exchange branch 21 is 4. Figure 1 shown.

[0056] Similarly, the number of heat exchange tubes in the second heat exchange branch 22 is greater than or equal to the number of heat exchange tubes in the first converging heat exchange branch 211, so that the second heat exchange branch 22 can better exert the heat exchange effect. Optionally, the number of heat exchange tubes in the second heat exchange branch 22 can be 4-12. For example, the number of heat exchange tubes in the second heat exchange branch 22 is 4. Figure 1 Optionally, the number of heat exchange tubes in the first heat exchange branch 21 is greater than or equal to the number of heat exchange tubes in the second heat exchange branch 22. Optionally, the sum of the number of heat exchange tubes in the first heat exchange branch 21 and the second heat exchange branch 22 is greater than the number of heat exchange tubes in the first converging heat exchange branch 211.

[0057] Optionally, the number of rows of heat exchange tubes in the first heat exchange branch 21 is greater than or equal to the number of rows of heat exchange tubes in the first converging heat exchange branch 211; and / or, the number of rows of heat exchange tubes in the second heat exchange branch 22 is greater than or equal to the number of rows of heat exchange tubes in the first converging heat exchange branch 211. The number of rows of heat exchange tubes in the first heat exchange branch 21 and the second heat exchange branch 22 is greater than or equal to 2 rows, and the number of rows of heat exchange tubes in the first converging heat exchange branch 211 is greater than or equal to 1 row. For example, the number of rows of heat exchange tubes in the first heat exchange branch 21 and the second heat exchange branch 22 is both 2 rows, and the number of rows of heat exchange tubes in the first converging heat exchange branch 211 is 1 row, such as Figure 1 shown.

[0058] Optionally, the first confluence heat exchange branch 211 includes a first confluence end 2111 connected to the first heat exchange branch 21 and the second heat exchange branch 22, and a second confluence end 2112 connected to the first liquid pipe 12, wherein the first confluence end 2111 is located at the upper part of the second confluence end 2112 in the vertical direction. Alternatively, the first confluence end 2111 is located at the middle position between the first heat exchange branch 21 and the second heat exchange branch 22. In this way, the uniformity of the refrigerant distribution of the first heat exchange branch 211 to the second heat exchange branch 22 is improved. The second confluence end 2112 connected to the first liquid pipe 12 is relatively low, so that the stability and certainty of the amount of refrigerant flowing from the first liquid pipe 12 into the first confluence heat exchange branch 211 is improved.

[0059] Optionally, the first heat exchange branch 211 includes a first heat exchange pipe 2113 directly connected to the first heat exchange branch 21 and the second heat exchange branch 22, and a second heat exchange pipe 2114 directly connected to the first liquid pipe 12, wherein the first heat exchange pipe 2113 is located at the upper part of the second heat exchange pipe 2114 in the vertical direction. Figure 2 shown.

[0060] Optionally, the first flow path switching assembly includes a first conductive component 111 and a second conductive component 121. The first conductive component 111 is connected to the first gas pipe 11, and the second conductive component 121 is connected to the first liquid pipe 12. The first heat exchange branch 21 and the second heat exchange branch 22 are connected to the conductive outflow end side of the first conductive component 111 of the first gas pipe 11, and the first converging heat exchange branch 211 is connected to the conductive outflow end side of the second conductive component 121 of the first liquid pipe 12.

[0061] Optionally, the first conducting component 111 or the second conducting component 121 includes a one-way valve, a solenoid valve, and a slider, a baffle, and other structural members that perform one-way conduction. Optionally, the conducting direction of the first conducting component 111 in the first air pipe 11 is from bottom to top, and similarly, the conducting direction of the second conducting component 121 in the first liquid pipe 12 is from bottom to top.

[0062] Optionally, the first heat exchange tube group further includes a third heat exchange branch 23 and a fourth heat exchange branch 24. One end of the third heat exchange branch 23 is connected to one side of the conduction inlet end of the first conduction component 111 of the first gas pipe 11, and the other end is connected to one side of the conduction outflow end of the second conduction component 121 of the first liquid pipe 12, and one end of the fourth heat exchange branch 24 is connected to one side of the conduction inlet end of the first conduction component 111 of the first gas pipe 11, and the other end is connected to one side of the conduction inlet end of the second conduction component 121 of the first liquid pipe 12.

[0063] When the variable flow-dividing heat exchanger is used as an evaporator, the first conduction component 111 and the second conduction component 121 are both in a conduction state, and the refrigerant flowing in from the liquid inlet of the first liquid pipe 12 flows into the first converging heat exchange branch 211, the third heat exchange branch 23 and the fourth heat exchange branch 24 respectively, wherein the refrigerant in the first converging heat exchange branch 211 flows into the first heat exchange branch 21 and the second heat exchange branch 22 respectively. Figure 4 shown.

[0064] When the variable flow-dividing heat exchanger is used as a condenser, the first conduction component 111 and the second conduction component 121 are both in a closed state, and the refrigerant flowing in from the liquid inlet of the first gas pipe 11 first flows through the first heat exchange branch 21 and the second heat exchange branch 22 respectively, and then flows through the third heat exchange branch 23 and the fourth heat exchange branch 24 in sequence after converging at the first converging heat exchange branch 211. Figure 3 shown.

[0065] As mentioned above, different heat exchange branches in the first heat exchange module have different communication modes when serving as evaporators and condensers, that is, variable flow division is achieved.

[0066] Optionally, the variable split heat exchanger also includes a second heat exchange module, which is arranged at the lower part of the first heat exchange module, and the second heat exchange module includes a second header assembly, a second heat exchange tube group and a second flow path switching assembly. The second header assembly includes a second gas pipe 31 and a second liquid pipe 32, and the second heat exchange tube group includes a plurality of heat exchange branches. The second flow path switching assembly is arranged in the second header assembly, and is used to switch the connection mode of at least part of the heat exchange branches in the second heat exchange tube group under different operation modes. Among them, the second heat exchange tube group includes a fifth heat exchange branch 41, a sixth heat exchange branch 42 and a second converging heat exchange branch 411, and one end of the fifth heat exchange branch 41 and the sixth heat exchange branch 42 are both connected to the second gas pipe 31, and the other ends of the fifth heat exchange branch 41 and the sixth heat exchange branch 42 are both connected to the second converging heat exchange branch 411, and the second converging heat exchange branch 411 is connected to the second liquid pipe 32.

[0067] Similar to the first flow path switching component, the second flow path switching component is used to switch the connection mode of at least some of the different heat exchange branches in the second heat exchange tube group under different operating modes. The second flow path switching component can form different connection modes between the heat exchange branches. For example, when the air-conditioning system operates in the cooling mode and the variable split heat exchanger is used as a condenser, at least some of the heat exchange branches in the second heat exchange tube group are connected in series. When the air-conditioning system operates in the heating mode and the variable split heat exchanger is used as an evaporator, at least some of the heat exchange branches in the second heat exchange tube group are connected in parallel. In this way, the second flow path switching component enables the variable split heat exchanger to have the optimal flow path in different operating modes, thereby improving the heat exchange efficiency of the heat exchanger.

[0068] Optionally, the number of heat exchange tubes in the fifth heat exchange branch 41 is greater than or equal to the number of heat exchange tubes in the second converging heat exchange branch 411; and / or the number of heat exchange tubes in the sixth heat exchange branch 42 is greater than or equal to the number of heat exchange tubes in the second converging heat exchange branch 411.

[0069] Optionally, the sum of the number of heat exchange tubes of the fifth heat exchange branch 41 and the sixth heat exchange branch 42 is greater than the number of heat exchange tubes of the second converging heat exchange branch 411; and / or, the number of heat exchange tubes of the fifth heat exchange branch 41 is greater than or equal to the number of heat exchange tubes of the sixth heat exchange branch 42. Optionally, the number of heat exchange tubes of the fifth heat exchange branch 41 and the sixth heat exchange branch 42 are both 4, and the number of heat exchange tubes of the second converging heat exchange branch 411 is 4, such as Figure 5 shown.

[0070] Optionally, the number of rows of heat exchange tubes in the fifth heat exchange branch 41 is greater than or equal to the number of rows of heat exchange tubes in the second confluence heat exchange branch 411; and / or, the number of rows of heat exchange tubes in the sixth heat exchange branch 42 is greater than or equal to the number of rows of heat exchange tubes in the second confluence heat exchange branch 411. For example, the number of rows of heat exchange tubes in both the fifth heat exchange branch 41 and the sixth heat exchange branch 42 is 2 rows, and the number of rows of heat exchange tubes in the second confluence heat exchange branch 411 is 1 row.

[0071] Optionally, the second confluence heat exchange branch 411 includes a third confluence end connected to the fifth heat exchange branch 41 and the sixth heat exchange branch 42, and a fourth confluence end connected to the second liquid pipe 32. Among them, in the vertical direction, the third confluence end is located above the fourth confluence end. Optionally, the third confluence end is arranged in the middle between the fifth heat exchange branch 41 and the sixth heat exchange branch 42.

[0072] Optionally, the second flow path switching component includes a third conduction component 311 and a fourth conduction component 321. The third conduction component 311 is connected and arranged in the second gas pipe 31, and the fourth conduction component 321 is connected and arranged in the second liquid pipe 32. Among them, the fifth heat exchange branch 41 and the sixth heat exchange branch 42 are connected to the conduction outflow end side of the third conduction component 311 of the second gas pipe 31, and the second confluence heat exchange branch 411 is connected to the conduction outflow end side of the fourth conduction component 321 of the second liquid pipe 32.

[0073] Similarly, the third conduction component 311 or the fourth conduction component 321 includes a check valve, a solenoid valve, and structural components such as a slider and a baffle with a one-way conduction function that play a one-way conduction role. Optionally, the conduction direction of the third conduction component 311 in the second gas pipe 31 is from bottom to top, and the conduction direction of the fourth conduction component 321 in the second liquid pipe 32 is from bottom to top.

[0074] Optionally, the second heat exchange tube group further includes a seventh heat exchange branch 43 and an eighth heat exchange branch 44. One end of the seventh heat exchange branch 43 is connected to the conduction inflow end side of the third conduction component 311 of the second gas pipe 31, and the other end is connected to the conduction outflow end side of the fourth conduction component 321 of the second liquid pipe 32. One end of the eighth heat exchange branch 44 is connected to the conduction inflow end side of the third conduction component 311 of the second gas pipe 31, and the other end is connected to the conduction inflow end side of the fourth conduction component 321 of the second liquid pipe 32.

[0075] When the variable flow-dividing heat exchanger is used as an evaporator, both the third conduction component 311 and the fourth conduction component 321 are in a conduction state, and the refrigerant flowing in from the liquid inlet of the second liquid pipe 32 flows into the second confluence heat exchange branch 411, the seventh heat exchange branch 43, and the eighth heat exchange branch 44 respectively. Among them, the refrigerant in the second confluence heat exchange branch 411 then flows into the fifth heat exchange branch 41 and the sixth heat exchange branch 42 respectively.

[0076] When the variable bypass heat exchanger is used as a condenser, the third conduction component 311 and the fourth conduction component 321 are both in a closed state, and the refrigerant flowing in from the liquid inlet of the second air pipe 31 first flows through the fifth heat exchange branch 41 and the sixth heat exchange branch 42 respectively, and after converging at the second converging heat exchange branch 411, it flows through the seventh heat exchange branch 43 and the eighth heat exchange branch 44 in turn.

[0077] Optionally, the variable split heat exchanger further includes a subcooling line 50, such as Figure 6 As shown, the subcooling degree of the refrigerant is improved when the variable split heat exchanger is used as a condenser.

[0078] Optionally, the variable split heat exchanger further includes a gas collecting main pipe 100, which is respectively connected to the first gas pipe 11, the second gas pipe 31 and the subcooling pipeline 50 through the first branch pipe 101, the second branch pipe 102 and the third branch pipe 103. Optionally, the variable split heat exchanger further includes a liquid separation element 60 respectively connected to the first liquid pipe 12, the second liquid pipe 32 and the subcooling pipeline 50. Figure 6 shown.

[0079] When the variable flow-dividing heat exchanger is used as an evaporator, the refrigerant flows in from the first liquid pipe 12 and the second liquid pipe 32, and the multiple conducting components are all in a conducting state, and the refrigerant is diverted after entering the first liquid pipe 12 and the second liquid pipe 32. When the refrigerant flows through the second conducting component 121 in the first liquid pipe 12 and the fourth conducting component 321 in the second liquid pipe 32, the refrigerant is accelerated due to the smaller diameter at the conducting component, resulting in more refrigerant being distributed to the heat exchange branch closer to the top of the first liquid pipe 12 and the second liquid pipe 32, resulting in uneven refrigerant distribution.

[0080] In the variable split heat exchanger provided in the embodiment of the present disclosure, in the first heat exchange module, the pressure loss flowing into the first heat exchange branch 21 and the second heat exchange branch 22 is increased by setting the first converging heat exchange branch 211, that is, the first heat exchange branch 21 and the second heat exchange branch 22 located at the top of the first heat exchange module are designed with targeted pressure loss, so that the top heat exchange branch is designed as 1-2, and the flow rate and pressure loss of this path are deliberately increased. In this way, the liquid separation amount between different heat exchange branches of the first heat exchange module is more uniform, which can effectively reduce the pressure drop of the refrigerant along the heat exchange branch, and improve the overall heat exchange efficiency of the variable split heat exchanger.

[0081] Similarly, in the second heat exchange module, the pressure loss flowing into the fifth heat exchange branch 41 and the sixth heat exchange branch 42 is increased by setting the second converging heat exchange branch 411, that is, the fifth heat exchange branch 41 and the sixth heat exchange branch 42 located at the top of the second heat exchange module are designed with targeted pressure loss, so that the top heat exchange branch is designed as 1-2, and the flow rate and pressure loss of this path are deliberately increased. In this way, the liquid separation amount between different heat exchange branches of the second heat exchange module is more uniform, which can effectively reduce the pressure drop of the refrigerant along the heat exchange branch, and improve the overall heat exchange efficiency of the variable split heat exchanger.

[0082] The embodiment of the present disclosure also provides an air conditioning system, comprising the variable split heat exchanger as described above.

[0083] The effects of the air conditioning system provided by the embodiment of the present disclosure are the same as those described above for the variable split heat exchanger, and are not described in detail here.

[0084] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A variable split flow heat exchanger, characterized in that: The first heat exchange module includes: A first header assembly includes a first gas pipe and a first liquid pipe; A first heat exchange tube group includes a plurality of heat exchange branches; and The first flow path switching assembly is arranged in the first header assembly and is used to switch the connection mode of at least part of the heat exchange branches in the first heat exchange tube group under different operation modes. Among them, the first heat exchange tube group includes a first heat exchange branch, a second heat exchange branch and a first converging heat exchange branch, and one end of the first heat exchange branch and the second heat exchange branch are both connected to the first air pipe, the other ends of the first heat exchange branch and the second heat exchange branch are both connected to the first converging heat exchange branch, and the first converging heat exchange branch is connected to the first liquid pipe.

2. The variable split flow heat exchanger according to claim 1, characterized in that: The number of heat exchange tubes in the first heat exchange branch is greater than or equal to the number of heat exchange tubes in the first converging heat exchange branch; and / or, The number of heat exchange tubes in the second heat exchange branch is greater than or equal to the number of heat exchange tubes in the first converging heat exchange branch; and / or, The sum of the number of heat exchange tubes in the first heat exchange branch and the second heat exchange branch is greater than the number of heat exchange tubes in the first converging heat exchange branch; and / or, The number of heat exchange tubes in the first heat exchange branch is greater than or equal to the number of heat exchange tubes in the second heat exchange branch.

3. The variable split heat exchanger according to claim 1, characterized in that: The number of heat exchange tube rows in the first heat exchange branch is greater than or equal to the number of heat exchange tube rows in the first converging heat exchange branch; and / or, The number of heat exchange tube rows in the second heat exchange branch is greater than or equal to the number of heat exchange tube rows in the first converging heat exchange branch; and / or, The number of rows of heat exchange tubes in the first heat exchange branch and the second heat exchange branch are both greater than or equal to 2 rows, and the number of rows of heat exchange tubes in the first converging heat exchange branch is greater than or equal to 1 row.

4. The variable split flow heat exchanger according to claim 1, characterized in that: The first converging heat exchange branch includes a first converging end connected to the first heat exchange branch and the second heat exchange branch, and a second converging end connected to the first liquid pipe, wherein in the vertical direction, the first converging end is located above the second converging end; and / or, The first heat exchange branch includes a first heat exchange tube directly connected to the first heat exchange branch and the second heat exchange branch, and a second heat exchange tube directly connected to the first liquid pipe, wherein the first heat exchange tube is located above the second heat exchange tube in the vertical direction.

5. The variable split flow heat exchanger according to claim 1, characterized in that: The first flow path switching component includes: A first conducting component is connected to the first air pipe; and The second conducting component is connected to the first liquid pipe. The first heat exchange branch and the second heat exchange branch are connected to the conduction outflow end side of the first conduction component of the first gas pipe, and the first converging heat exchange branch is connected to the conduction outflow end side of the second conduction component of the first liquid pipe.

6. The variable split heat exchanger according to claim 5, characterized in that: The first heat exchange tube group also includes: A third heat exchange branch, one end of which is connected to the conductive inlet end of the first conductive component of the first gas pipe, and the other end of which is connected to the conductive outlet end of the second conductive component of the first liquid pipe; and, The fourth heat exchange branch has one end connected to the conduction inflow end of the first conduction component of the first gas pipe, and the other end connected to the conduction inflow end of the second conduction component of the first liquid pipe.

7. The variable split heat exchanger according to any one of claims 1 to 6, characterized in that: The device further comprises a second heat exchange module, which is arranged at the lower part of the first heat exchange module. The second heat exchange module comprises: A second header assembly includes a second gas pipe and a second liquid pipe; A second heat exchange tube group includes a plurality of heat exchange branches; and, The second flow path switching assembly is arranged in the second header assembly and is used to switch the connection mode of at least part of the heat exchange branches in the second heat exchange tube group under different operation modes. Among them, the second heat exchange tube group includes the fifth heat exchange branch, the sixth heat exchange branch and the second converging heat exchange branch, and one end of the fifth heat exchange branch and the sixth heat exchange branch are connected to the second air pipe, the other end of the fifth heat exchange branch and the sixth heat exchange branch are connected to the second converging heat exchange branch, and the second converging heat exchange branch is connected to the second liquid pipe.

8. The variable split heat exchanger according to claim 7, characterized in that: The second flow path switching component includes: A third conducting component is connected to the second air pipe; and The fourth conducting component is connected to the second liquid pipe. Among them, the fifth heat exchange branch and the sixth heat exchange branch are connected to the conduction outflow end side of the third conduction component of the second gas pipe, and the second converging heat exchange branch is connected to the conduction outflow end side of the fourth conduction component of the second liquid pipe.

9. The variable split heat exchanger according to claim 8, characterized in that: The second heat exchange tube group also includes: a seventh heat exchange branch, one end of which is connected to the conduction inflow end of the third conduction component of the second gas pipe, and the other end of which is connected to the conduction outflow end of the fourth conduction component of the second liquid pipe; and, The eighth heat exchange branch has one end connected to the conduction inflow end side of the third conduction component of the second gas pipe, and the other end connected to the conduction inflow end side of the fourth conduction component of the second liquid pipe.

10. An air conditioning system, characterized in that: It comprises the variable split heat exchanger as claimed in any one of claims 1 to 9.

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