Heat exchanger, air conditioner outdoor unit and air conditioner

Abstract

This application relates to the field of air conditioning technology, specifically providing a heat exchanger, an outdoor air conditioning unit, and an air conditioner, aiming to solve the problem that heat exchangers cannot simultaneously meet the flow path requirements of cooling and heating modes. The heat exchanger includes: a first main pipe comprising two branch main pipe sections; at least two sets of heat exchange tube groups, each set of heat exchange tube groups correspondingly connected to a branch main pipe section, including a first sub-tube group and a second sub-tube group, the first sub-tube group including a first branch pipe group and a second branch pipe group; a first control valve disposed between a first connection node of the first sub-tube group and a branch main pipe section and a second connection node of the second sub-tube group and a branch main pipe section; multiple second main pipes correspondingly connected to each set of heat exchange tube groups; second control valves disposed between a third connection node of the first branch pipe group and a second main pipe and a fourth connection node of the second branch pipe group and a second main pipe; and refrigerant distributors respectively connected to the multiple second main pipes. This solution can have different refrigerant flow paths in different modes.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, specifically providing a heat exchanger, an outdoor unit of an air conditioner, and an air conditioner. Background Technology

[0002] For existing heat pump air conditioner heat exchangers, the flow path configuration is the same under various operating conditions, including cooling, heating, and different operating frequencies. However, the optimal refrigerant flow path for the best performance of the indoor and outdoor heat exchangers differs between cooling and heating modes. When the air conditioner is operating in heating mode, the refrigerant in the outdoor heat exchanger's pipes is in a low-temperature, low-pressure region. Its heat transfer performance is mainly constrained by the heat transfer coefficient and pressure drop, making a relatively large number of branches suitable. This significantly reduces pressure drop and increases system pressure while maintaining the heat transfer coefficient, thereby increasing the air conditioner's heat exchange capacity. When the air conditioner is operating in cooling mode, the refrigerant pressure loss in the outdoor heat exchanger's pipes is smaller, and its heat transfer performance is mainly affected by the heat transfer coefficient. This makes a smaller number of branches suitable to increase the refrigerant flow rate and thus increase the heat transfer coefficient, thereby increasing the air conditioner's heat exchange capacity.

[0003] In other words, evaporators with a single flow path cannot meet the flow path requirements of both cooling and heating modes, and therefore cannot achieve efficient operation of the evaporator in multiple modes. Utility Model Content

[0004] This application aims to solve the above-mentioned technical problem, namely, to solve the problem that heat exchangers are unable to simultaneously meet the flow path requirements of both cooling and heating modes.

[0005] In a first aspect, this application provides a heat exchanger, comprising: a first main pipe, including at least two parallel branch main pipe sections; at least two sets of heat exchange tube groups, each set of heat exchange tube groups having a corresponding branch main pipe section connected to its first end; each set of heat exchange tube groups including a first sub-tube group and at least a second sub-tube group, wherein the first sub-tube group includes at least a first branch tube group and a second branch tube group; a first control valve disposed on the branch main pipe section, the first control valve being located between a first connection node of the first sub-tube group and the branch main pipe section and a second connection node of the second sub-tube group and the branch main pipe section, the first control valve being configured to conduct from the second connection node to the first connection node; a plurality of second main pipes, each second main pipe correspondingly connected to a second end of each set of heat exchange tube groups; a second control valve disposed on the second main pipe, the second control valve being located between a third connection node of the first branch tube group and the second main pipe and a fourth connection node of the second branch tube group and the second main pipe; the second control valve being configured to conduct from the fourth connection node to the third connection node; and a refrigerant distributor, the first end of the refrigerant distributor being respectively connected to the plurality of second main pipes.

[0006] By employing the above technical solution, the cooperation of the first control valve and the second control valve enables the heat exchanger to have different numbers and different flow lengths of refrigerant passages when used as a condenser or evaporator, thereby improving heat exchange efficiency.

[0007] Specifically, when the heat exchanger functions as a condenser, the refrigerant flows into multiple main pipe sections and is then diverted to corresponding heat exchange tube groups. After passing through the second sub-tube group, the refrigerant flows back to the first sub-tube group under the control of the first and second control valves. This reduces flow losses. The refrigerant flowing to the first sub-tube group passes through the first and second branch pipe groups in sequence, making the first sub-tube group a subcooling group, thereby extending the refrigerant flow length and improving heat exchange efficiency during refrigeration. The refrigerant in the multiple heat exchange tube groups is collected by a refrigerant distribution device. When the heat exchanger functions as an evaporator, the refrigerant flows from the refrigerant distribution device to multiple heat exchange tube groups. Under the control of the second and first control valves, the refrigerant flowing into each heat exchange tube group is diverted to the second and first sub-tube groups. The refrigerant flowing to the first sub-tube group is further diverted to the first and second branch pipe groups. This increases the number of heat exchange paths for the refrigerant, improves the uniformity of refrigerant distribution, and thus improves heat exchange efficiency.

[0008] In an optional embodiment of the heat exchanger described above, the second sub-tube group includes at least two sets of third branch tube groups arranged in parallel.

[0009] By setting up a second sub-pipe group that includes at least two sets of third branch pipe groups arranged in parallel, the number of refrigerant flow paths can be increased, thereby improving heat exchange efficiency.

[0010] In an optional embodiment of the heat exchanger described above, the second sub-tube group further includes: a connecting pipe section, the first end of which is connected to the second ends of multiple sets of the third branch pipe groups, and the second end of which is connected to the second main pipe.

[0011] The connection pipe section allows the refrigerant in multiple third branch pipe groups to flow and converge evenly when the heat exchanger is used as a condenser. The connection pipe section guides the converged refrigerant to the second main pipe, avoiding flow deviation and ensuring smooth refrigerant flow. It can also improve the uniformity of refrigerant distribution to multiple third branch pipe groups when the heat exchanger is used as an evaporator, thereby optimizing the overall performance of the system.

[0012] In an optional embodiment of the heat exchanger described above, the system further includes: a subcooling tube assembly; and a third main pipe connected between the refrigerant distributor and the subcooling tube assembly.

[0013] By installing a subcooling manifold and a third main pipe connecting the refrigerant distributor and the subcooling manifold, the subcooling of the refrigerant can be further enhanced in cooling mode, achieving secondary subcooling of the refrigerant and thus improving the heat exchanger's heat transfer performance. Simultaneously, the presence of the subcooling manifold effectively reduces refrigerant pressure loss in the pipeline, improving system operating efficiency.

[0014] In an optional embodiment of the heat exchanger described above, the subcooling tube assembly is located at the bottom end of the heat exchanger.

[0015] In this way, when the heat exchanger is used as an evaporator, frost can be avoided at the bottom of the heat exchanger to a certain extent; even if frost forms at the bottom of the heat exchanger, the heat of the refrigerant flowing through the cold pipe assembly can be used to defrost it, thereby ensuring the heat exchange efficiency of the subsequent heat exchanger.

[0016] In an optional embodiment of the heat exchanger described above, a throttling device is further included, disposed in the third main pipe.

[0017] By installing a throttling device on the third main pipe, located between the subcooled pipe assembly and the refrigerant distributor, the refrigerant pressure and flow rate within the heat exchanger can be regulated. Especially in heating mode, the throttling device effectively reduces refrigerant pressure, ensuring it enters the heat exchanger with suitable temperature and pressure conditions, thereby improving heat exchange efficiency and overall system performance.

[0018] In an optional embodiment of the heat exchanger described above, the heat exchanger further includes: a first filter disposed on the third main pipe and located between the refrigerant distributor and the throttling device; and a second filter disposed on the third main pipe and located between the throttling device and the subcooling tube assembly.

[0019] The function of the first and second filters is to remove impurities and particulate matter from the refrigerant, prevent blockage or wear of the throttling device and the refrigerant flow pipeline, thereby ensuring the long-term stable operation of the system.

[0020] In the optional implementation of the heat exchanger described above, the heat exchange tube group includes three groups, and the three groups of heat exchange tube groups are arranged sequentially from top to bottom.

[0021] By incorporating three sets of heat exchange tubes, the heat exchange capacity of the heat exchanger can be improved. Furthermore, the top-to-bottom arrangement of these three sets optimizes the internal space distribution of the heat exchanger, enhancing its overall compactness and facilitating the even distribution of refrigerant among the different tube sets. In addition, this arrangement effectively reduces refrigerant flow resistance and improves the heat transfer efficiency within the heat exchanger, thereby further enhancing its overall performance.

[0022] In an optional embodiment of the heat exchanger described above, a third control valve is further included, disposed on the main branch section and / or disposed between the fourth connection node on the second main branch and the refrigerant distributor; the third control valve is configured to open or close the corresponding heat exchange tube group.

[0023] By setting a third control valve, the number of heat exchanger tubes connected to the heat exchanger and participating in heat exchange can be increased or decreased, thereby flexibly adjusting the heat exchanger's heat exchange capacity to adapt to different operating modes and load requirements, and thus improving the overall adaptability and operating efficiency of the system.

[0024] In an optional embodiment of the heat exchanger described above, the first control valve is a one-way valve; and / or, the second control valve is a one-way valve.

[0025] By setting the first control valve as a one-way valve, the flow of refrigerant from the second connection node to the first connection node can be guaranteed, and the reverse flow of refrigerant can be completely avoided, thereby improving the stability and reliability of the heat exchanger.

[0026] By setting the second control valve as a one-way valve, the flow control of the refrigerant can be further optimized, ensuring that the refrigerant flows from the fourth connection node to the third connection node and avoiding backflow, thereby ensuring efficient refrigerant distribution when the heat exchanger is used as an evaporator.

[0027] In a second aspect, this application provides an outdoor unit for an air conditioner, including the aforementioned heat exchanger.

[0028] In a third aspect, this application provides an air conditioner including the aforementioned heat exchanger. Attached Figure Description

[0029] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0030] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0031] Figure 1 This is a schematic diagram of the structure of a heat exchanger provided in an embodiment of this disclosure;

[0032] Figure 2 This is a schematic diagram of refrigerant flow when a heat exchanger is used as a condenser according to an embodiment of this disclosure;

[0033] Figure 3 This is a schematic diagram of refrigerant flow when a heat exchanger is used as an evaporator according to an embodiment of this disclosure;

[0034] Figure 4 This is a schematic diagram of another heat exchanger provided in an embodiment of this disclosure;

[0035] Figure 5 This is a schematic diagram of another heat exchanger provided in an embodiment of this disclosure.

[0036] Figure label:

[0037] 01. First inlet / outlet pipe; 02. Second inlet / outlet pipe; 100. First main pipe; 110. Branch main pipe section; 111. First connection node; 112. Second connection node; 200. Heat exchanger tube assembly; 210. First sub-tube assembly; 211. First branch pipe assembly; 212. Second branch pipe assembly; 220. Second sub-tube assembly; 221. Third branch pipe assembly; 222. Connecting pipe section; 310. First control valve; 320. Second control valve; 330. Third control valve; 340. Fifth control valve; 350. Sixth control valve; 410. Second main pipe; 411. Third connection node; 412. Fourth connection node; 420. Third main pipe; 500. Refrigerant distributor; 600. Subcooling tube assembly; 700. Throttling device; 910. First filter; 920. Second filter. Detailed Implementation

[0038] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. In the following description, for ease of explanation, numerous details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other instances, well-known structures and apparatuses may be simplified for the sake of simplicity.

[0039] It should be noted that in the description of this application, the terms "center," "upper," "lower," "vertical," "inner," and "outer," which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] Combination Figures 1 to 5As shown, this embodiment of the present disclosure provides a heat exchanger, including a first main pipe 100, a heat exchange tube assembly 200, a first control valve 310, a second control valve 320, a second main pipe 410, and a refrigerant distributor 500.

[0042] The first main pipe 100 includes at least two parallelly arranged sub-main pipe sections 110.

[0043] The heat exchange tube group 200 includes at least two groups, and each heat exchange tube group 200 has a corresponding branch main tube section 110 connected to its first end. Each heat exchange tube group 200 includes a first sub-tube group 210 and at least a second sub-tube group 220; wherein, the first sub-tube group 210 includes at least a first branch tube group 211 and a second branch tube group 212.

[0044] The first control valve 310 is disposed in the main branch section 110, located between the first connection node 111 of the first sub-pipe group 210 and the second connection node 112 of the second sub-pipe group 220 and the main branch section 110. The first control valve 310 is configured to conduct from the second connection node 112 to the first connection node 111.

[0045] Alternatively, when there are multiple second sub-pipe groups 220 connected in parallel, the first control valve 310 is located between the second sub-pipe group 220 and the first sub-pipe group 210, which is adjacent to the first sub-pipe group 210.

[0046] At least two second main pipes 410 are provided, and each second main pipe 410 is connected to the second end of each heat exchange tube group 200.

[0047] The second control valve 320 is disposed on the second main pipe 410, located between the third connection node 411 of the first branch pipe group 211 and the second main pipe 410, and the fourth connection node 412 of the second branch pipe group 212 and the second main pipe 410. The second control valve 320 is configured to conduct from the fourth connection node 412 to the third connection node 411.

[0048] The first end of the refrigerant distributor 500 is connected to multiple second main pipes 410.

[0049] Optionally, the heat exchanger further includes a first inlet / outlet pipe 01, and a first main pipe 100 is connected between the first inlet / outlet pipe 01 and the heat exchange tube group 200. Specifically, when the heat exchanger is used as a condenser, the refrigerant flows in through the first inlet / outlet pipe 01 and is branched into multiple parallel branch main pipe sections 110, thereby further flowing to the heat exchange tube group 200 connected to the corresponding branch main pipe section 110.

[0050] Optionally, the first inlet / outlet pipe 01 and the first main pipe 100 are welded together.

[0051] Alternatively, the first inlet / outlet pipe 01 and the first main pipe 100 are integrally formed to improve the stability of the outdoor heat exchanger and reduce costs.

[0052] Furthermore, the heat exchanger tube assembly 200 includes a first sub-tube assembly 210 and a second sub-tube assembly 220 arranged sequentially from bottom to top. This improves the compactness of the heat exchanger and facilitates the flow of the refrigerant.

[0053] When there are multiple sets of second sub-tube groups 220, the multiple sets of second sub-tube groups 220 are connected in parallel. When the heat exchanger is used as a condenser, the first sub-tube group 210 and the second sub-tube group 220 are connected in series; when the heat exchanger is used as an evaporator, the first sub-tube group 210 and the second sub-tube group 220 are connected in parallel.

[0054] The first end of the heat exchange tube assembly 200 is connected to the main branch section 110, and the second end of the heat exchange tube assembly is connected to the second main branch 410. Multiple second main branches 410 are connected in parallel and respectively connected to the refrigerant distributor.

[0055] Furthermore, the connection point between the first sub-pipe group 210 and the main branch section 110 is the first connection node 111, and the connection point between the second sub-pipe group 220 and the main branch section 110 is the second connection node 112. A first control valve 310 is provided between the first connection node 111 and the second connection node 112, and the first control valve 310 is configured to conduct from the second connection node 112 to the first connection node 111.

[0056] Further, the first sub-pipe group 210 includes a first branch pipe group 211 and a second branch pipe group 212. The second branch pipe group 212 and the first branch pipe group 211 are arranged sequentially from bottom to top. The connection point between the first branch pipe group 211 and the second main pipe 410 is a third connection node 411, and the connection point between the second branch pipe group 212 and the second main pipe 410 is a fourth connection node 412. A second control valve 320 is provided between the third connection node 411 and the fourth connection node 412, and the second control valve 320 is configured to conduct from the fourth connection node 412 to the third connection node 411.

[0057] Therefore, when the heat exchanger functions as a condenser, the gaseous refrigerant is diverted to multiple main pipe sections 110 and then to the corresponding heat exchange tube groups 200. When the heat exchange tube group 200 has multiple sets of second sub-tube groups 220, the refrigerant is diverted to each set of second sub-tube groups 220; when the heat exchange tube group 200 has only one set of second sub-tube groups 220, all the refrigerant flows to that second sub-tube group 220. Furthermore, under the shut-off action of the first control valve 310 and the second control valve 320, the refrigerant flowing out of the second sub-tube group 220 flows sequentially through the first branch pipe group 211 and the second branch pipe group 212, then flows back into the second main pipe 410, and through the second main pipe 410 to the refrigerant distributor 500. In this way, before the refrigerant flows to the refrigerant distributor 500, the flow path of the refrigerant is reduced and extended through the first branch pipe group 211 and the second branch pipe group 212, thereby allowing the refrigerant to fully condense into liquid phase refrigerant and increasing the refrigerant flow rate, thus improving refrigeration efficiency. The first branch pipe group 211 and the second branch pipe group 212 can also subcool the refrigerant, thereby improving the heat exchange efficiency of the refrigerant.

[0058] The subcooling effect of the first branch pipe group 211 and the second branch pipe group 212 can prevent flash evaporation of gas when the refrigerant flows into the refrigerant distributor.

[0059] At this time, the first control valve 310 and the second control valve 320 are closed, thereby restricting the refrigerant from flowing in the aforementioned direction to prevent the refrigerant from flowing in the wrong direction.

[0060] Alternatively, the first sub-pipe group 210 may also include other branch pipe groups besides the first branch pipe group 211 and the second branch pipe group 212. For example, it may also include a third branch pipe group and a fourth branch pipe group. In this case, a fourth control valve corresponding to the third branch pipe group and the fourth branch pipe group needs to be installed on the second main pipe 410. The fourth control valve is located between the connection node of the third branch pipe group and the second main pipe 410 and the connection node of the fourth branch pipe group and the second main pipe 410. In this way, the flow length of the refrigerant can be further extended.

[0061] When the heat exchanger functions as an evaporator, the first control valve 310 and the second control valve 320 are activated. At this time, the liquid refrigerant flows from the refrigerant distributor 500 to multiple second main pipes 410. Further, the refrigerant flows into the first sub-pipe group 210 and the second sub-pipe group 220. The refrigerant flowing into the first sub-pipe group 210 is further divided and flows into the first branch pipe group 211 and the second branch pipe group 212. This increases the number of refrigerant flow paths. When there are multiple parallel second sub-pipe groups 220, the refrigerant flowing into the second sub-pipe group 220 can be divided and flow into multiple second sub-pipe groups. This increases the number of refrigerant flow paths, resulting in less pressure loss during flow, allowing for sufficient heat exchange and the formation of gaseous refrigerant, thereby increasing the heat exchange capacity.

[0062] At this time, both the first control valve 310 and the second control valve 320 are turned on, thereby restricting the refrigerant from flowing in the aforementioned direction.

[0063] When the above technical solution is adopted, the cooperation of the first control valve 310 and the second control valve 320 enables the heat exchanger to have different numbers and different flow lengths of refrigerant passages when used as a condenser or evaporator, thereby improving the heat exchange efficiency.

[0064] In an optional embodiment of the heat exchanger described above, the first control valve 310 is a one-way valve; and / or, the second control valve 320 is a one-way valve.

[0065] By setting the first control valve 310 as a one-way valve, the flow of refrigerant from the second connection node 112 to the first connection node 111 can be guaranteed, and the reverse flow of refrigerant can be completely avoided, thereby improving the stability and reliability of the system.

[0066] By setting the second control valve 320 as a one-way valve, the flow control of the refrigerant can be further optimized, ensuring the refrigerant flows from the fourth connection node 412 to the third connection node 411, avoiding backflow, and thus ensuring efficient refrigerant distribution when the heat exchanger is used as an evaporator.

[0067] Alternatively, the first control valve 310 can be a solenoid valve, ball valve, or other valve that controls the on / off state of the pipeline.

[0068] Alternatively, the second control valve 320 can be a solenoid valve, ball valve, or other valve that controls the on / off state of the pipeline.

[0069] In an optional embodiment of the heat exchanger described above, the second sub-tube group 220 includes at least two sets of third branch tube groups 221 arranged in parallel.

[0070] By setting the second sub-pipe group 220 to include at least two sets of third branch pipe groups 221 arranged in parallel, the number of refrigerant flow paths can be increased, thereby improving heat exchange efficiency.

[0071] Specifically, at least two sets of third branch pipe groups are connected in parallel. Multiple parallel third branch pipe groups 221 can divert the flow of refrigerant and increase the heat exchange surface area, thereby improving heat exchange efficiency.

[0072] Alternatively, the second sub-tube group 220 may include only one set of third branch tube groups 221.

[0073] In an optional embodiment of the heat exchanger described above, the second sub-tube group 220 further includes a connecting pipe section 222. The first end of the connecting pipe section 222 is connected to the second end of multiple third branch pipe groups 221, and the second end of the connecting pipe section 222 is connected to the second main pipe 410.

[0074] The connection pipe section 222 is designed so that when the heat exchanger is used as a condenser, the refrigerant in multiple sets of third branch pipe groups 221 can be evenly combined and collected. The connection pipe section 222 guides the combined refrigerant to the second main pipe to avoid flow deviation and ensure the smooth flow of refrigerant.

[0075] The connection pipe section 222 can also improve the uniformity of refrigerant distribution to multiple third branch pipe groups 221 when the heat exchanger is used as an evaporator, thereby optimizing the overall performance of the system.

[0076] Optionally, the connecting pipe segment 222 includes at least a first branch pipe, a second branch pipe, and a main pipe. The main pipe is connected to the second main pipe 410, and the first and second branch pipes are respectively connected to different third branch pipe groups 221.

[0077] Alternatively, the first branch pipe is a gradually expanding pipe, that is, the diameter gradually increases from the third branch pipe group 221 towards the second main pipe 410.

[0078] Alternatively, the second branch pipe is a gradually expanding pipe, that is, the diameter gradually increases from the third branch pipe group 221 towards the second main pipe 410.

[0079] Alternatively, the third branch pipe group 221 of the second sub-pipe group 220 is directly connected to the second main pipe 410.

[0080] In an optional embodiment of the heat exchanger described above, a subcooling tube assembly 600 and a third main tube 420 are also included. The third main tube 420 is connected between the refrigerant distributor 500 and the subcooling tube assembly 600.

[0081] By installing a subcooling pipe assembly 600 and a third main pipe 420 connecting the refrigerant distributor 500 and the subcooling pipe assembly 600, the subcooling degree of the refrigerant can be further increased when the heat exchanger is used as a condenser, achieving secondary subcooling of the refrigerant and allowing it to fully condense into a liquid phase, thereby enhancing the heat exchanger's heat transfer performance. Simultaneously, the presence of the subcooling pipe assembly can effectively reduce the pressure loss of the refrigerant in the pipeline, improving the system's operating efficiency.

[0082] The subcooled tube assembly 600 is connected in series with at least two heat exchange tube assemblies 200 via a refrigerant distributor 500. When the heat exchanger functions as a condenser, the refrigerant flows through at least two heat exchange tube assemblies 200, exchanges heat with the external environment or other media, and then enters the refrigerant distributor 500. It then flows to the subcooled tube assembly 600 through the third main pipe 420. When the heat exchanger functions as an evaporator, the refrigerant first flows through the subcooled tube assembly 600, then flows into the refrigerant distributor 500 through the third main pipe 420. The refrigerant is then distributed to multiple heat exchange tube assemblies 200, where it exchanges heat with the external environment or other media.

[0083] Alternatively, the subcooling tube assembly 600 can be omitted.

[0084] Optionally, the subcooling pipe assembly 600 is also connected to a second inlet / outlet pipe 02. When the heat exchanger is used as a condenser, the refrigerant flows through the subcooling pipe assembly 600 and then flows out of the heat exchanger through the second inlet / outlet pipe 02; when the heat exchanger is used as an evaporator, the refrigerant enters the heat exchanger through the second inlet / outlet pipe 02 and flows out of the heat exchanger through the first inlet / outlet pipe 01.

[0085] In an optional embodiment of the heat exchanger described above, the subcooling tube assembly 600 is located at the bottom of the heat exchanger.

[0086] The subcooling tube assembly 600 is located at the bottom of the heat exchanger, which can also be understood as the subcooling tube assembly 600 being positioned below at least two sets of heat exchange tube assemblies 200. This allows for defrosting of the bottom of the heat exchanger when it is used as an evaporator. Since the refrigerant entering the subcooling tube assembly 600 is a high-temperature, high-pressure gaseous refrigerant, frost or ice formation on the subcooling tube assembly 600 can be prevented to some extent, thus improving the energy efficiency of the heat exchanger.

[0087] In addition, even if frost forms at the bottom of the heat exchanger, the heat from the refrigerant flowing through the cold pipe assembly 600 can be used to defrost it, thus ensuring the heat exchange efficiency of the subsequent heat exchangers.

[0088] In an optional embodiment of the heat exchanger described above, a throttling device 700 is also included. The throttling device 700 is disposed in the third main pipe 420.

[0089] By installing a throttling device 700 on the third main pipe 420 and positioning it between the subcooling pipe assembly 600 and the refrigerant distributor 500, the refrigerant pressure and flow rate within the heat exchanger can be regulated. Especially in heating mode, the throttling device 700 effectively reduces the refrigerant pressure, ensuring it enters the heat exchanger with suitable temperature and pressure conditions, thereby improving heat exchange efficiency and overall system performance.

[0090] Optionally, the throttling device 700 is an electronic expansion valve. Electronic expansion valves can continuously adjust the opening degree, featuring fast response and high adjustment accuracy, and can better meet the system's dynamic requirements for refrigerant flow.

[0091] Alternatively, combined Figure 4 As shown, the throttling device 700 is a capillary tube.

[0092] Alternatively, the throttling device 700 includes multiple capillary tubes connected sequentially to the heat exchanger tube assembly 200, with a bypass branch on each capillary tube. A fifth control valve 340 is installed on the bypass branch, and a sixth control valve 350 is installed at one end of each capillary tube. When the fifth control valve 340 is open and the sixth control valve 350 is closed, that capillary tube is not connected to the refrigerant flow circuit; when the fifth control valve 340 is closed and the sixth control valve 350 is open, that capillary tube is connected to the refrigerant flow circuit. In this way, the number of capillary tubes connected can be determined according to the load of the heat exchanger to ensure the length of the corresponding connected capillary tubes and guarantee the heat exchange effect of the heat exchanger.

[0093] In an optional embodiment of the heat exchanger described above, a first filter 910 and a second filter 920 are also included. The first filter 910 is disposed in the third main pipe 420 and is located between the refrigerant distributor 500 and the throttling device 700; the second filter 920 is disposed in the third main pipe 420 and is located between the throttling device 700 and the subcooling tube assembly 600.

[0094] The function of the first filter 910 and the second filter 920 is to remove impurities and particulate matter from the refrigerant, and to prevent the throttling device and the refrigerant circulation pipeline (including the second main pipe 410, the third main pipe 420, the heat exchange tube group 200, the subcooling tube group 600 and the first main pipe 100, etc.) from being blocked or worn, thereby ensuring the long-term stable operation of the system.

[0095] Specifically, when the heat exchanger is used as a condenser, it can filter and purify the refrigerant flowing out of the heat exchange tube assembly 200 to prevent impurities from affecting the subsequent flow and heat exchange of the refrigerant; when the heat exchanger is used as an evaporator, it can filter and purify the refrigerant flowing into the heat exchange tube assembly 200 to improve the heat exchange efficiency of the heat exchanger.

[0096] Optionally, by reasonably setting the position and specifications of the first filter 910 and the second filter 920, the reliability and maintenance convenience of the heat exchanger can be effectively improved.

[0097] Optionally, a first mesh element is provided in the first filter 910, and / or a second mesh element is provided in the second filter 920.

[0098] By setting the first mesh element, the refrigerant flowing through the first filter 910 can be dispersed, so that the air bubbles in the refrigerant are divided into smaller air bubbles when passing through the mesh, thereby improving the stability of refrigerant flow and reducing the noise generated by the bursting of air bubbles, thus improving the quietness of system operation.

[0099] Similarly, by setting the second mesh element, the refrigerant flowing through the second filter 920 can be dispersed, so that the air bubbles in the refrigerant are divided into smaller air bubbles when passing through the mesh, thereby improving the stability of refrigerant flow and reducing the noise generated by bubble bursting, thus improving the quietness of system operation.

[0100] Alternatively, the first filter 910 may not be set.

[0101] Alternatively, a second filter 920 may not be provided.

[0102] In the optional implementation of the heat exchanger described above, the heat exchange tube group 200 includes three groups, and the three groups of heat exchange tube groups 200 are arranged sequentially from top to bottom.

[0103] By incorporating three sets of heat exchange tubes 200, the heat exchange capacity of the heat exchanger is enhanced. Furthermore, the sequential arrangement of the three sets of heat exchange tubes 200 from top to bottom optimizes the internal space distribution of the heat exchanger, improving its overall compactness and facilitating the even distribution of refrigerant among the different heat exchange tube sets. In addition, this arrangement effectively reduces refrigerant flow resistance and improves the heat transfer efficiency within the heat exchanger, thereby further enhancing the overall performance of the equipment.

[0104] It should be noted that at this time, the three sets of heat exchange tube groups 200 and subcooling tube groups 600 are arranged sequentially from top to bottom.

[0105] Optionally, by rationally designing the size and spacing of each heat exchange tube group, the uniformity of refrigerant flow rate can be ensured, avoiding local overheating or overcooling, and providing a more stable operating environment for the system.

[0106] In the optional implementation of the above heat exchanger, combined with Figure 5As shown, it also includes a third control valve 330. The third control valve 330 is located at the end of the main pipe section 110 away from the first sub-pipe group 210, and / or, the third control valve 330 is located between the fourth connection node 412 on the second main pipe 410 and the refrigerant distributor 500.

[0107] The third control valve 330 is set to either open or close the corresponding heat exchange tube assembly 200.

[0108] By setting the third control valve 330, the number of heat exchange tube groups 200 connected to the heat exchanger and participating in heat exchange can be increased or decreased, thereby flexibly adjusting the heat exchange capacity of the heat exchanger to adapt to different operating modes and load requirements, and thus improving the overall adaptability and operating efficiency of the system.

[0109] Specifically, the third control valve 330 is located on the main branch section 110 near the first inlet / outlet pipe 01. Further, when the heat exchanger functions as a condenser, controlling the third control valve 330 on the main branch section 110 to open the corresponding heat exchange tube assembly 200; controlling the third control valve 330 on the main branch section 110 to close it prevents waste of refrigerant and heat resources. In this case, the third control valve 330 on the second main branch 410 can be either open or closed. When the heat exchanger functions as an evaporator, controlling the third control valve 330 on the second main branch 410 to open the corresponding heat exchange tube assembly; controlling the third control valve 330 on the second main branch 410 to close it prevents waste of refrigerant and heat resources. In this case, the third control valve 330 on the main branch section 110 can be either open or closed.

[0110] Furthermore, when the third control valve 330 is open, the corresponding sub-main pipe section 110 and the second main pipe 410 are also open, and the heat exchange tube group 200 between the sub-main pipe section 110 and the corresponding second main pipe 410 is open, participating in the heat exchange process of the heat exchanger. When the third control valve 330 is closed, the corresponding sub-main pipe section 110 and the second main pipe 410 are closed, and the refrigerant cannot flow through the heat exchange tube group 200 between the sub-main pipe section 110 and the corresponding second main pipe 410. In this way, the number of third control valves 330 that are open can be determined according to the actual load of the heat exchanger.

[0111] Optionally, the third control valve 330 is an electronic expansion valve.

[0112] Alternatively, a third control valve 330 may not be provided.

[0113] In a second aspect, this application provides an outdoor unit for an air conditioner, including the heat exchanger as described above.

[0114] In a third aspect, this application provides an air conditioner, including a heat exchanger as described above; and / or, an outdoor unit of an air conditioner as described above.

[0115] Specifically, the air conditioner includes the heat exchanger as described above and the outdoor unit as described above; or, the air conditioner includes the heat exchanger as described above; or, the air conditioner includes the outdoor unit as described above, and the outdoor unit includes the heat exchanger as described above.

[0116] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

[0117] Those skilled in the art will understand that although some embodiments herein include certain features included in the embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0118] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A heat exchanger, characterized in that, include: The first main section (100) includes at least two parallel sub-main sections (110); At least two sets of heat exchange tube groups (200), each set of heat exchange tube groups (200) has a corresponding first end connected to a section of the said branch main tube (110); each set of heat exchange tube groups (200) includes a first sub-tube group (210) and at least a second sub-tube group (220), wherein the first sub-tube group (210) includes at least a first branch tube group (211) and a second branch tube group (212); A first control valve (310) is disposed in the main branch section (110). The first control valve (310) is located between the first sub-pipe group (210) and the first connection node (111) of the main branch section (110) and the second sub-pipe group (220) and the second connection node (112) of the main branch section (110). The first control valve (310) is configured to conduct from the second connection node (112) to the first connection node (111). At least two second main pipes (410), each second main pipe (410) being connected to the second end of each heat exchange tube group (200); A second control valve (320) is disposed on the second main pipe (410). The second control valve (320) is located between the third connection node (411) of the first branch pipe group (211) and the second main pipe (410) and the fourth connection node (412) of the second branch pipe group (212) and the second main pipe (410). The second control valve (320) is configured to conduct from the fourth connection node (412) to the third connection node (411). A refrigerant distributor (500) has its first end connected to a plurality of second main pipes (410).

2. The heat exchanger according to claim 1, characterized in that, The second sub-tube group (220) includes: At least two sets of third branch pipe groups arranged in parallel (221).

3. The heat exchanger according to claim 2, characterized in that, The second sub-tube group (220) also includes: A connecting pipe section (222) is provided, the first end of which is connected to the second end of multiple sets of the third branch pipe groups (221), and the second end of which is connected to the second main pipe (410).

4. The heat exchanger according to any one of claims 1 to 3, characterized in that, Also includes: Subcooling tube assembly (600); The third main pipe (420) is connected between the refrigerant distributor (500) and the subcooling pipe assembly (600).

5. The heat exchanger according to claim 4, characterized in that, Also includes: The subcooling tube assembly (600) is located at the bottom of the heat exchanger.

6. The heat exchanger according to claim 4, characterized in that, Also includes: A throttling device (700) is provided on the third main pipe (420).

7. The heat exchanger according to claim 6, characterized in that, Also includes: A first filter (910) is disposed in the third main pipe (420) and located between the refrigerant distributor (500) and the throttling device (700); A second filter (920) is disposed in the third main pipe (420) and located between the throttling device (700) and the subcooling pipe assembly (600).

8. The heat exchanger according to any one of claims 1 to 3, characterized in that, Also includes: A third control valve (330) is disposed on the main pipe section (110) at the end away from the first sub-pipe group (210), and / or, disposed on the second main pipe (410) between the fourth connection node (412) and the refrigerant distributor (500); the third control valve (330) is configured to open or close the corresponding heat exchange tube group (200); and / or The first control valve (310) is a one-way valve; and / or The second control valve (320) is a one-way valve; and / or The heat exchange tube assembly (200) comprises three sets, and the three sets of heat exchange tube assemblies (200) are arranged sequentially from top to bottom.

9. An outdoor unit for an air conditioner, characterized in that, Includes the heat exchanger as described in any one of claims 1 to 8.

10. An air conditioner, characterized in that, include: The heat exchanger as described in any one of claims 1 to 8; and / or The outdoor unit of the air conditioner as described in claim 9.

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