Heat exchange structure, air conditioner and control method

Abstract

The application provides a heat exchange structure, an air conditioner and a control method. The heat exchange structure comprises: a first heat exchanger; a second heat exchanger; a pipeline structure connected with the first heat exchanger and the second heat exchanger; and a control module configured to control the flow direction of fluid in the pipeline structure, so that the heat exchange structure has a refrigeration parallel mode, a refrigeration series mode, a heating mode, a heating defrosting mode and a defrosting mode. The heat exchange structure solves the technical problem of poor heat exchange effect of the heat exchanger structure with the function of rotating defrosting in the related art.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically to a heat exchange structure, an air conditioner, and a control method. Background Technology

[0002] Existing technologies already include outdoor heat exchanger structures with defrosting functions. Details are as follows:

[0003] 1) By installing solenoid valves between some liquid collection pipes, some gas collection pipes, and the heat exchanger flow path, the parallel or series connection of the heat exchange flow path can be achieved by changing the on / off state of the solenoid valves. However, this method fails to take into account the alternating defrosting of the outdoor heat exchanger under heating mode and fails to maximize the function of the heat exchanger under series and parallel flow paths.

[0004] 2) The structure of dual four-way valves and dual outdoor heat exchangers allows for alternating defrosting of the two outdoor heat exchangers by switching the flow paths of the four-way valves and the outdoor heat exchangers. However, this method fails to consider the different heat exchanger volumes required for different operating loads in cooling mode, cannot realize the series and parallel flow paths of the heat exchangers, and cannot maximize the cooling capacity under different operating loads.

[0005] Therefore, existing technologies need further development. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a heat exchange structure, an air conditioner, and a control method to solve the technical problem of poor heat exchange effect in heat exchanger structures with alternating defrosting functions in related technologies.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solution: A heat exchange structure is provided, comprising: a first heat exchanger; a second heat exchanger; a piping structure connected to both the first and second heat exchangers; and a control module for controlling the flow direction of fluid within the piping structure, so that the heat exchange structure has a parallel cooling mode, a series cooling mode, a heating mode, a heating-defrosting mode, and a defrosting mode; wherein, when the heat exchange structure is in the parallel cooling mode, the first and second heat exchangers are used for cooling, and the first... The first and second heat exchangers are connected in parallel. When the heat exchange structure is in refrigeration series mode, the first and second heat exchangers are used for refrigeration, and the first and second heat exchangers are connected in series. When the heat exchange structure is in heating mode, the first and second heat exchangers are used for heating. When the heat exchange structure is in heating-defrosting mode, either the first or second heat exchanger is used for heating, and the other of the first and second heat exchangers is defrosted. When the heat exchange structure is in defrosting mode, both the first and second heat exchangers are defrosted.

[0008] Furthermore, the pipeline structure includes: a gas connection pipe for introducing gas into the pipeline structure or leading out gas from the pipeline structure; and a liquid connection pipe for introducing liquid into the pipeline structure or leading out liquid from the pipeline structure.

[0009] Furthermore, the control module includes a control valve assembly, which includes at least one four-way valve. The control valve assembly is disposed within the piping structure to change the flow direction of fluid within the piping structure.

[0010] Furthermore, the heat exchange structure also includes: a first connecting pipe, one end of which is connected to the input end of the first heat exchanger, and the other end of which is connected to the control valve group; and a second connecting pipe, one end of which is connected to the output end of the first heat exchanger, and the other end of which is connected to the control valve group.

[0011] Furthermore, the heat exchange structure also includes: a third connecting pipe, one end of which is connected to the input end of the second heat exchanger, and the other end of which is connected to the control valve group; and a fourth connecting pipe, one end of which is connected to the output end of the second heat exchanger, and the other end of which is connected to the control valve group.

[0012] Furthermore, the heat exchange structure also includes: a compressor; a fifth connecting pipe, one end of which is connected to the compressor's air inlet and the other end of which is connected to the control valve assembly; and a sixth connecting pipe, one end of which is connected to the compressor's air outlet and the other end of which is connected to the control valve assembly.

[0013] Furthermore, the heat exchange structure also includes a gas-liquid separator, which is installed on the fifth connecting pipe.

[0014] Furthermore, the control valve group includes a first four-way valve, a second four-way valve, and a third four-way valve; wherein, the D ends of the first four-way valve and the third four-way valve are respectively connected to the sixth connecting pipe; the E ends of the first four-way valve and the second four-way valve are respectively connected to the fifth connecting pipe; the D end of the second four-way valve is connected to the S end of the third four-way valve; the E end of the third four-way valve is connected to the liquid collecting end of the first heat exchanger; the C end of the third four-way valve is connected to the liquid pipe connecting pipe; the S end of the first four-way valve is connected to the gas pipe connecting pipe (8); the C end of the first four-way valve is connected to the gas collecting end of the first heat exchanger; the S end of the second four-way valve is connected to the gas collecting end of the second heat exchanger; and the C end of the second four-way valve is connected to the gas collecting end of the first heat exchanger.

[0015] Furthermore, the C end of the third four-way valve is connected to the liquid pipe connecting pipe through the first throttling component; the liquid collecting end of the second heat exchanger is connected to the liquid pipe connecting pipe through the second throttling component; the C end of the second four-way valve is connected to the gas collecting end of the first heat exchanger through the first control valve; and the C end of the first four-way valve is connected to the gas collecting end of the first heat exchanger through the second control valve.

[0016] An air conditioner includes a heat exchange structure, which is the heat exchange structure described above.

[0017] A control method is applicable to the aforementioned heat exchange structure, the heat exchange structure comprising: determining the operating mode of the heat exchange structure; when the heat exchange structure is in a refrigeration parallel mode, the first heat exchanger and the second heat exchanger are used for refrigeration, and the first heat exchanger and the second heat exchanger are connected in parallel; when the heat exchange structure is in a refrigeration series mode, the first heat exchanger and the second heat exchanger are used for refrigeration, and the first heat exchanger and the second heat exchanger are connected in series; when the heat exchange structure is in a heating mode, the first heat exchanger and the second heat exchanger are used for heating; when the heat exchange structure is in a heating defrosting mode, either the first heat exchanger or the second heat exchanger is used for heating, and the other of the first heat exchanger or the second heat exchanger is defrosted; when the heat exchange structure is in a defrosting mode, both the first heat exchanger and the second heat exchanger are defrosted.

[0018] Further, the control method includes: setting a first four-way valve, a second four-way valve, and a third four-way valve; wherein, the D ends of the first four-way valve and the third four-way valve are respectively connected to two pipelines branching off from the outlet of the compressor of the heat exchange structure; the E ends of the first four-way valve and the second four-way valve are respectively connected to the inlet end of the gas-liquid separator of the heat exchange structure; the D end of the second four-way valve is connected to the S end of the third four-way valve; the E end of the third four-way valve is connected to the liquid collection end of the first heat exchanger; the C end of the third four-way valve is connected to the liquid pipe connection pipe; the S end of the first four-way valve is connected to the gas pipe connection pipe (8); the C end of the first four-way valve is connected to the gas collection end of the first heat exchanger; the S end of the second four-way valve is connected to the gas collection end of the second heat exchanger; and the C end of the second four-way valve is connected to the gas collection end of the first heat exchanger.

[0019] Furthermore, when the heat exchange structure is in the refrigeration parallel mode, the coil of the first four-way valve is de-energized, the DC terminal of the first four-way valve is connected, and the ES terminal of the first four-way valve is connected; the coils of the second four-way valve and the third four-way valve are both energized, the DS terminals of the second four-way valve and the third four-way valve are both connected, and the CE terminals of the second four-way valve and the third four-way valve are both connected.

[0020] Furthermore, when the heat exchange structure is in the refrigeration series mode, the coils of the first four-way valve and the third four-way valve are de-energized, the DC terminals of the first four-way valve and the third four-way valve are both connected, and the ES terminals of the first four-way valve and the third four-way valve are both connected; the coil of the second four-way valve is energized, and the DS terminal and the CE terminal of the second four-way valve are connected.

[0021] Furthermore, when the heat exchange structure is in heating mode, the coils of the first four-way valve and the third four-way valve are both energized, the DS terminals of the first four-way valve and the third four-way valve are both connected, and the CE terminals of the first four-way valve and the third four-way valve are connected; the coil of the second four-way valve is de-energized, and the DC terminal and the SE terminal of the second four-way valve are connected.

[0022] Furthermore, when the heat exchange structure is in heating and defrosting mode; the coils of the first four-way valve, the second four-way valve, and the third four-way valve are all energized, and the DS terminals of the first four-way valve, the second four-way valve, and the third four-way valve are all connected, as are the CE terminals of the first four-way valve, the second four-way valve, and the third four-way valve; or, the coils of the first four-way valve and the third four-way valve are both energized, and the DS terminals of the first four-way valve and the third four-way valve are connected, as are the CE terminals of the first four-way valve and the third four-way valve; the coil of the second four-way valve is de-energized, the DC terminal of the second four-way valve is connected, and the SE terminal of the second four-way valve is connected.

[0023] Beneficial effects:

[0024] The heat exchange structure in this embodiment includes: a first heat exchanger; a second heat exchanger; a piping structure connected to both the first and second heat exchangers; and a control module for controlling the flow direction of fluid within the piping structure, enabling the heat exchange structure to have a parallel cooling mode, a series cooling mode, a heating mode, a heating-defrosting mode, and a defrosting mode. Specifically, when the heat exchange structure is in the parallel cooling mode, the first and second heat exchangers are used for cooling, and the first and second heat exchangers are connected in parallel; when the heat exchange structure is in the series cooling mode, the first and second heat exchangers are used for cooling, and the first and second heat exchangers are connected in series; when the heat exchange structure is in the heating mode, the first and second heat exchangers are used for heating; when the heat exchange structure is in the heating-defrosting mode, either the first or second heat exchanger is used for heating, and the other of the first and second heat exchangers is used for defrosting; and when the heat exchange structure is in the defrosting mode, both the first and second heat exchangers are used for defrosting. The heat exchange structure of this invention employs multiple defrosting flow paths, which can be used as needed to ensure indoor comfort and solve the technical problem of poor heat exchange effect in heat exchanger structures with alternating defrosting functions. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the heat exchange structure used in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the heat exchange structure used in the embodiment of the present invention when it is in the parallel cooling mode;

[0027] Figure 3 This is a schematic diagram of the heat exchange structure used in the embodiment of the present invention when it is in the refrigeration series mode;

[0028] Figure 4 This is a schematic diagram of the heat exchange structure used in the embodiment of the present invention when it is in heating mode;

[0029] Figure 5 This is a schematic diagram of the heat exchange structure used in the embodiment of the present invention when it is in heating mode;

[0030] Figure 6 This is a schematic diagram of the heat exchange structure used in the embodiment of the present invention when it is in heating and defrosting mode;

[0031] Figure 7 This is a schematic diagram of the heat exchange structure used in the defrosting mode in an embodiment of the present invention.

[0032] The above figures include the following reference numerals:

[0033] 1. Gas-liquid separator; 2. Compressor; 301. First four-way valve; 302. Second four-way valve; 303. Third four-way valve; 401. First throttling component; 402. Second throttling component; 501. First heat exchanger; 502. Second heat exchanger; 601. First control valve; 602. Second control valve; 7. Liquid pipe connection pipe; 8. Gas pipe connection pipe. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0035] According to an embodiment of the present invention, a heat exchange structure is provided; please refer to [link / reference]. Figures 1 to 7The system includes: a first heat exchanger 501; a second heat exchanger 502; a piping structure connected to both the first heat exchanger 501 and the second heat exchanger 502; and a control module for controlling the flow direction of fluid within the piping structure, enabling the heat exchange structure to operate in parallel cooling mode, series cooling mode, heating mode, heating-defrosting mode, and defrosting mode. Specifically, when the heat exchange structure is in parallel cooling mode, the first heat exchanger 501 and the second heat exchanger 502 are used for cooling, and the first heat exchanger 501 and the second heat exchanger 502 are connected in parallel. When the heat exchange structure is in series cooling mode... In the connected mode, the first heat exchanger 501 and the second heat exchanger 502 are used for cooling, and the first heat exchanger 501 and the second heat exchanger 502 are connected in series; when the heat exchange structure is in the heating mode, the first heat exchanger 501 and the second heat exchanger 502 are used for heating; when the heat exchange structure is in the heating-defrosting mode, either the first heat exchanger 501 or the second heat exchanger 502 is used for heating, and the other of the first heat exchanger 501 and the second heat exchanger 502 is defrosted; when the heat exchange structure is in the defrosting mode, both the first heat exchanger 501 and the second heat exchanger 502 are defrosted.

[0036] Specifically, during conventional defrosting, the indoor unit is shut down, and the refrigerant flowing through the indoor unit absorbs heat, reducing comfort. The heat exchange structure in this embodiment allows for alternating defrosting of the heat exchangers during defrosting. Under mild heating conditions, alternating defrosting of the outdoor heat exchanger is used, allowing the indoor unit to maintain heating mode during this period, resulting in relatively high comfort. However, under severe heating conditions, when the outdoor heat exchanger frosts rapidly and extensively, alternating defrosting of the outdoor heat exchanger cannot guarantee comfort. This is because, under severe conditions, alternating defrosting of the heat exchanger would result in a long defrosting time, and while one heat exchanger is defrosting, the already defrosted heat exchanger would quickly frost back up, thus reducing unit performance. Therefore, a conventional defrosting flow path is used under severe conditions. The heat exchange structure in this embodiment employs multiple defrosting flow paths, which can be selected as needed to ensure indoor comfort and solve the technical problem of poor heat exchange performance in heat exchanger structures with alternating defrosting functionality.

[0037] In the heat exchange structure of this embodiment, see Figure 1 The piping structure includes: a gas connection pipe 8, used to introduce gas into the piping structure or to lead out gas from the piping structure; and a liquid connection pipe 7, used to introduce liquid into the piping structure or to lead out liquid from the piping structure. In this way, the heat exchange structure achieves cooling and heating effects by inputting and outputting refrigerant in different states, thereby improving the comfort of indoor temperature control.

[0038] See Figure 1In the heat exchange structure of this embodiment, the control module includes a control valve group, which includes at least one four-way valve. The control valve group is disposed within the pipeline structure to change the flow direction of the fluid within the pipeline structure. Specifically, the four-way valve is a common valve body and has a strong ability to switch pipelines, thereby facilitating the realization of various pipeline connection methods.

[0039] In the heat exchange structure of this embodiment, see Figure 1 The heat exchange structure also includes: a first connecting pipe, one end of which is connected to the input end of the first heat exchanger 501, and the other end of which is connected to the control valve group; and a second connecting pipe, one end of which is connected to the output end of the first heat exchanger 501, and the other end of which is connected to the control valve group. Thus, by setting up the first and second connecting pipes to connect the first heat exchanger 501 to the control valve group, it is helpful to control the direction of the input and output of the first heat exchanger 501.

[0040] In the heat exchange structure of this embodiment, see Figure 1 The heat exchange structure also includes: a third connecting pipe, one end of which is connected to the input end of the second heat exchanger 502, and the other end of which is connected to the control valve group; and a fourth connecting pipe, one end of which is connected to the output end of the second heat exchanger 502, and the other end of which is connected to the control valve group. Thus, by setting up the third and fourth connecting pipes to connect the second heat exchanger 502 to the control valve group, it is helpful to control the direction of the input and output of the second heat exchanger 502.

[0041] See Figure 1 In this embodiment, the heat exchange structure further includes: a compressor 2; a fifth connecting pipe, one end of which is connected to the air inlet of the compressor 2, and the other end of which is connected to the control valve group; and a sixth connecting pipe, one end of which is connected to the air outlet of the compressor 2, and the other end of which is connected to the control valve group. Thus, by providing the sixth connecting pipe, the high-pressure fluid output from the compressor 2 can be passed through different pipes, thereby achieving different functions.

[0042] See Figure 1 In this embodiment, the heat exchange structure further includes a gas-liquid separator 1, which is installed on the fifth connecting pipe. The gas-liquid separator 1 discharges liquid from the fluid, thereby improving the compressor's operating efficiency.

[0043] In the heat exchange structure of this embodiment, see Figure 1The control valve group includes a first four-way valve 301, a second four-way valve 302, and a third four-way valve 303. The D ends of the first four-way valve 301 and the third four-way valve 303 are respectively connected to the sixth connecting pipe; the E ends of the first four-way valve 301 and the second four-way valve 302 are respectively connected to the fifth connecting pipe; the D end of the second four-way valve 302 is connected to the S end of the third four-way valve 303; the E end of the third four-way valve 303 is connected to the liquid collecting end of the first heat exchanger 501; the C end of the third four-way valve 303 is connected to the liquid connecting pipe 7; the S end of the first four-way valve 301 is connected to the gas connecting pipe 8; the C end of the first four-way valve 301 is connected to the gas collecting end of the first heat exchanger 501; the S end of the second four-way valve 302 is connected to the gas collecting end of the second heat exchanger 502; and the C end of the second four-way valve 302 is connected to the gas collecting end of the first heat exchanger 501. By setting three four-way valves, the system can switch between two flow paths in cooling mode while meeting the various cooling and heating needs of the heat exchange structure. In heating mode, it can meet the defrosting work of one or all heat exchangers, thus satisfying the needs of efficient cooling and heating under different operating loads.

[0044] In the heat exchange structure of this embodiment, see Figure 1 The C-end of the third four-way valve 303 is connected to the liquid pipe connecting pipe 7 via the first throttling component 401; the liquid collecting end of the second heat exchanger 502 is connected to the liquid pipe connecting pipe 7 via the second throttling component 402; the C-end of the second four-way valve 302 is connected to the gas collecting end of the first heat exchanger 501 via the first control valve 601; the C-end of the first four-way valve 301 is connected to the gas collecting end of the first heat exchanger 501 via the second control valve 602. With the above configuration, the flow rate and on / off state in the pipeline can be controlled, thereby adjusting the operating conditions of various functions and improving the working efficiency of the heat exchange structure.

[0045] The air conditioner of this embodiment includes a heat exchange structure, which is the heat exchange structure described above. Using this heat exchange structure in the air conditioner of this embodiment, the outdoor heat exchanger can be connected in series or in parallel flow paths in cooling mode, suitable for flow path switching under multi-load scenarios, achieving more efficient cooling. In heating mode, the outdoor heat exchanger operates in parallel flow paths, ensuring sufficient evaporation and avoiding or reducing frost formation; in defrosting mode, the heat exchangers can be defrosted alternately while the indoor unit continuously heats, improving indoor comfort.

[0046] The control method of this embodiment is applicable to the heat exchange structure described above. The heat exchange structure includes: determining the operating mode of the heat exchange structure; when the heat exchange structure is in a parallel cooling mode, the first heat exchanger 501 and the second heat exchanger 502 are used for cooling, and the first heat exchanger 501 and the second heat exchanger 502 are connected in parallel; when the heat exchange structure is in a series cooling mode, the first heat exchanger 501 and the second heat exchanger 502 are used for cooling, and the first heat exchanger 501 and the second heat exchanger 502 are connected in series; when the heat exchange structure is in a heating mode, the first heat exchanger 501 and the second heat exchanger 502 are used for heating; when the heat exchange structure is in a heating defrosting mode, either the first heat exchanger 501 or the second heat exchanger 502 is used for heating, and the other of the first heat exchanger 501 or the second heat exchanger 502 is defrosted; when the heat exchange structure is in a defrosting mode, both the first heat exchanger 501 and the second heat exchanger 502 are defrosted.

[0047] Using the above method, the indoor unit is in a stopped state during conventional defrosting, and the refrigerant flowing through the indoor side absorbs indoor heat, reducing comfort. The heat exchange structure of this embodiment allows for alternating defrosting of the heat exchangers during defrosting. Under normal heating conditions, alternating defrosting of the outdoor heat exchanger is used, and the indoor unit can maintain heating mode operation during this period, resulting in relatively high comfort. However, under severe heating conditions, when the outdoor heat exchanger frosts rapidly and extensively, alternating defrosting of the outdoor heat exchanger cannot guarantee comfort. This is because, under severe conditions, alternating defrosting of the heat exchanger results in a long defrosting time, and while one heat exchanger is defrosting, the already defrosted heat exchanger will quickly frost again, thus reducing unit performance. Therefore, a conventional defrosting flow path is used under severe conditions. The heat exchange structure of this embodiment employs multiple defrosting flow paths, which can be selected as needed to ensure indoor comfort and solve the technical problem of poor heat exchange effect in heat exchanger structures with alternating defrosting function.

[0048] In the control method of this embodiment, see Figure 1The control method includes: setting a first four-way valve 301, a second four-way valve 302, and a third four-way valve 303; wherein, the D ends of the first four-way valve 301 and the third four-way valve 303 are respectively connected to two pipelines branching off from the outlet of the compressor 2 of the heat exchange structure; the E ends of the first four-way valve 301 and the second four-way valve 302 are respectively connected to the inlet end of the gas-liquid separator 1 of the heat exchange structure; the D end of the second four-way valve 302 is connected to the S end of the third four-way valve 303. The connection is as follows: the E end of the third four-way valve 303 is connected to the liquid collection end of the first heat exchanger 501; the C end of the third four-way valve 303 is connected to the liquid pipe connection pipe 7; the S end of the first four-way valve 301 is connected to the gas pipe connection pipe 8; the C end of the first four-way valve 301 is connected to the gas collection end of the first heat exchanger 501; the S end of the second four-way valve 302 is connected to the gas collection end of the second heat exchanger 502; the C end of the second four-way valve 302 is connected to the gas collection end of the first heat exchanger 501. By setting three four-way valves, while meeting the various cooling and heating requirements of the heat exchange structure, the cooling mode allows for switching between two flow paths, and the heating mode can meet the defrosting work of one or all heat exchangers, satisfying the needs of efficient cooling and heating under different operating loads.

[0049] In the control method of this embodiment, when the heat exchange structure is in parallel cooling mode, the coil of the first four-way valve 301 is de-energized, and the DC terminal and ES terminal of the first four-way valve 301 are connected; the coils of the second four-way valve 302 and the third four-way valve 303 are both energized, and the DS terminals and CE terminals of the second four-way valve 302 and the third four-way valve 303 are both connected. Thus, when the cooling requirement is not high, the parallel cooling method of two heat exchangers is used to improve the cooling efficiency of the heat exchange structure.

[0050] In the control method of this embodiment, when the heat exchange structure is in refrigeration series mode, the coils of the first four-way valve 301 and the third four-way valve 303 are de-energized, and the DC terminals and ES terminals of both valves are connected; the coil of the second four-way valve 302 is energized, and the DS terminal and CE terminal of the second four-way valve 302 are connected. Thus, when high refrigeration requirements are needed, a series refrigeration method using two heat exchangers is employed to meet the refrigeration demands.

[0051] In the control method of this embodiment, when the heat exchange structure is in heating mode, the coils of the first four-way valve 301 and the third four-way valve 303 are both energized, and the DS terminals of the first four-way valve 301 and the third four-way valve 303 are both connected, as are the CE terminals of the first four-way valve 301 and the third four-way valve 303; the coil of the second four-way valve 302 is de-energized, and the DC terminal and the SE terminal of the second four-way valve 302 are connected. This satisfies the user's heating needs.

[0052] In the control method of this embodiment, when the heat exchange structure is in heating and defrosting mode, the coils of the first four-way valve 301, the second four-way valve 302, and the third four-way valve 303 are all energized, and their DS terminals are all connected, as are their CE terminals; or, the coils of the first and third four-way valves 301 and 303 are both energized, their DS terminals are connected, and their CE terminals are connected; the coil of the second four-way valve 302 is de-energized, its DC terminal is connected, and its SE terminal is connected. Thus, with the above structure, the function of simultaneously heating and defrosting the first heat exchanger 501 or the second heat exchanger 502 can be achieved.

[0053] The heat exchange structure in this embodiment is as follows:

[0054] See Figure 1 The outdoor heat exchanger adopts a two-stage design, consisting of an outdoor first heat exchanger 501 and an outdoor second heat exchanger 502. The first throttling component 401, acting as the refrigerant flow control component for the outdoor first heat exchanger 501, is connected to it via a third four-way valve 303. This allows for flow control and switching between series and parallel flow paths for refrigeration. The second throttling component 402, acting as the refrigerant flow control component for the outdoor second heat exchanger 502, is directly connected to it. Based on the outdoor second heat exchanger, the system uses valve switching to achieve parallel and series flow paths between the outdoor first and second heat exchangers in cooling mode; in heating mode, they alternate defrosting. The system is equipped with three four-way valves. Through the four-way valves and the double-layer outdoor heat exchanger design, multi-flow path functionality is achieved. The specific structure is shown below:

[0055] The gas-liquid separator 1 is connected to the suction side pipeline of the compressor 2. The discharge side of the compressor 2 is divided into two lines, which are respectively connected to the D ends of the first four-way valve 301 and the third four-way valve 303. The E ends of the first four-way valve 301 and the second four-way valve 302 are connected to the inlet pipe end of the gas-liquid separator 1. The D end of the second four-way valve 302 is connected to the S end of the third four-way valve 303. The E end of the third four-way valve 303 is connected to the liquid collection end of the outdoor first heat exchanger 501, and the C end is connected to the liquid pipe connecting pipe 7 through the first throttling component 401. The S end of the first four-way valve 301 is connected to the gas pipe connecting pipe 8, and the C end is connected to the gas collection end of the outdoor first heat exchanger 501 through the second control valve 602. The S end of the second four-way valve 302 is connected to the gas collection end of the outdoor second heat exchanger 502, and the C end is connected to the gas collection end of the outdoor first heat exchanger 501 through the first control valve 601.

[0056] The specific advantages are:

[0057] In cooling mode, two flow paths can be switched to meet the needs of efficient cooling under different operating loads.

[0058] Figure 2 The diagram shows the parallel flow path of the outdoor heat exchanger in cooling mode. In this flow path, the first four-way valve coil is de-energized, with the DC terminal and ES terminal connected; the second and third four-way valve coils are energized, with the DS terminal and CE terminal connected. The second control valve 602 is open, and the first control valve 601 is closed. The first throttling component 401 is open, and the second throttling component 402 is open. The gaseous refrigerant returning from the indoor unit passes through the gas pipe connection pipe 8 back to the gas-liquid separator 1 for gas-liquid separation. The gaseous refrigerant then enters the compressor 2 for compression. The high-temperature, high-pressure refrigerant splits into two paths. One path passes through the DC terminal of the first four-way valve 301 and the second control valve 602 to enter the outdoor first heat exchanger 501 for condensation. The condensed refrigerant then passes through the first throttling component 401 to the CE terminal of the third four-way valve 303 and returns to the liquid pipe connection pipe 7. The other path passes through the DS terminal of the third four-way valve 303 to the DS terminal of the second four-way valve 302 and enters the outdoor second heat exchanger 502 for condensation. The condensed refrigerant then passes through the second throttling component 402 and returns to the liquid pipe connection pipe 7. At this point, both refrigerant paths converge at the liquid pipe connection pipe 7 and enter the indoor side.

[0059] Figure 3 The diagram shows the series flow path of the outdoor heat exchanger in cooling mode. In this flow path, the coils of the first and third / four-way valves are de-energized, with the DC terminal and ES terminal connected; the coil of the second four-way valve 302 is energized, with the DS terminal and CE terminal connected. The second control valve 602 is open, and the first control valve 601 is closed. The first throttling component 401 is closed, and the second throttling component 402 is open. The gaseous refrigerant returning from the indoor unit passes through the gas pipe connection pipe 8 back to the gas-liquid separator 1 for gas-liquid separation. The gaseous refrigerant then enters the compressor 2 for compression. The high-temperature, high-pressure refrigerant passes through the DC terminal of the first four-way valve 301 and the second control valve 602 into the first outdoor heat exchanger 501 for primary condensation. The condensed refrigerant then enters the SE terminal of the third four-way valve 303, and then through the DS terminal of the second four-way valve 302 into the second outdoor heat exchanger 502 for secondary condensation. The condensed refrigerant returns to the liquid pipe connection pipe 7 via the second throttling component 402, and then enters the indoor side to achieve cooling.

[0060] like Figure 4The diagram shows the flow path in heating mode. In this flow path, the coils of the first and third / four-way valves are energized, with the DS and CE terminals connected; the coil of the second four-way valve 302 is de-energized, with the DC and SE terminals connected. The second control valve 602 is open, and the first control valve 601 is closed. The first throttling component 401 is open, and the second throttling component 402 is open. The liquid refrigerant returning from the indoor unit is divided into two paths via the liquid pipe connection pipe 7. One path enters the CE terminal of the third four-way valve 303 through the first throttling component 401, and then returns to the outdoor first heat exchanger 501 for evaporation. The evaporated low-pressure gaseous refrigerant enters the CE terminal of the first four-way valve 301 through the second control valve 602, and then returns to the inlet pipe of the gas-liquid separator 1. The other path enters the outdoor second heat exchanger 502 through the second throttling component 402 for evaporation. The evaporated low-pressure gaseous refrigerant enters the SE terminal of the second four-way valve 302, and then returns to the inlet pipe of the gas-liquid separator 1. The two refrigerants converge at the inlet of the gas-liquid separator 1, and then enter the compressor through the gas-liquid separator 1. The high-pressure refrigerant after being compressed by the compressor 2 enters the gas pipe connection pipe 8 through the first four-way valve 301DS end, and then enters the indoor side to achieve heating.

[0061] Figure 5 The diagram shows the defrosting flow path for the outdoor second heat exchanger 502 during continuous heating. In this flow path, the coils of the first, second, and third four-way valves are energized, with the DS and CE terminals connected. The second control valve 602 is open, and the first control valve 601 is closed. The first throttling component 401 and the second throttling component 402 are both open. The high-pressure, high-temperature refrigerant compressed by the compressor 2 is divided into two paths. One path enters the gas pipe connection pipe 8 through the DS terminal of the first four-way valve 301, and then enters the indoor unit for heating, achieving continuous heating during defrosting. The other path sequentially enters the outdoor second heat exchanger 502 through the DS terminals of the third four-way valve 303 and the second four-way valve 302 for defrosting. The liquid refrigerant, after being condensed on the indoor side and the outdoor second heat exchanger 502, converges at the liquid pipe connection pipe 7, enters the third four-way valve 303CE through the first throttling component 401, and then enters the outdoor first heat exchanger 501 to evaporate. The evaporated low-pressure and low-temperature refrigerant enters the first four-way valve 301CE through the second control valve 602 and returns to the gas-liquid separator 1. The separated gaseous refrigerant enters the compressor for compression, and the cycle continues.

[0062] Figure 6The diagram shows the defrosting flow path for the outdoor first heat exchanger 501 during continuous heating. In this flow path, the coils of the first and third / four-way valves are energized, with the DS and CE terminals connected; the coil of the second four-way valve 302 is de-energized, with the DC and SE terminals connected. The second control valve 602 is closed, and the first control valve 601 is open. The first throttling component 401 and the second throttling component 402 are both open. The high-pressure, high-temperature refrigerant compressed by the compressor 2 is divided into two paths. One path enters the gas pipe connection pipe 8 through the DS terminal of the first four-way valve 301, entering the indoor side for heating, achieving continuous heating of the indoor unit during defrosting. The other path sequentially enters the outdoor first heat exchanger 501 through the DS terminal of the third four-way valve 303, the DC terminal of the second four-way valve 302, and the first control valve 601 for defrosting. The defrosted liquid refrigerant then enters the liquid pipe connection pipe 7 through the CE terminal of the third four-way valve 303 and the first throttling component 401, merging with the liquid refrigerant from the indoor side. The combined refrigerant enters the outdoor second heat exchanger 502 through the second throttling component 402 for evaporation. The evaporated refrigerant then enters the second four-way valve 302SE and returns to the gas-liquid separator 1. The separated gaseous refrigerant then enters the compressor for compression, and the cycle continues.

[0063] See Figure 7 This is the standard defrosting flow path. This flow path is consistent with the parallel flow path of the refrigeration heat exchanger shown in the figure, and will not be described again here.

[0064] The system's flow path design allows for switching between series and parallel flow paths for refrigeration heat exchangers, and for alternating or overall defrosting of heating heat exchangers. It is suitable for operation in various scenarios, improving cooling or heating capabilities.

[0065] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0066] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0067] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0068] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0069] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A heat exchange structure, characterized in that, include: First heat exchanger (501); Second heat exchanger (502); The piping structure is connected to both the first heat exchanger (501) and the second heat exchanger (502); The control module is used to control the flow direction of the fluid in the pipeline structure so that the heat exchange structure has a refrigeration parallel mode, a refrigeration series mode, a heating mode, a heating defrosting mode, and a defrosting mode. Specifically, when the heat exchange structure is in the refrigeration parallel mode, the first heat exchanger (501) and the second heat exchanger (502) are used for refrigeration, and the first heat exchanger (501) and the second heat exchanger (502) are connected in parallel; when the heat exchange structure is in the refrigeration series mode, the first heat exchanger (501) and the second heat exchanger (502) are used for refrigeration, and the first heat exchanger (501) and the second heat exchanger (502) are connected in series; when the heat exchange structure is in the heating mode, the first heat exchanger (501) and the second heat exchanger (502) are used for heating; when the heat exchange structure is in the heating defrosting mode, either the first heat exchanger (501) or the second heat exchanger (502) is used for heating, and the other of the first heat exchanger (501) or the second heat exchanger (502) is defrosted; when the heat exchange structure is in the defrosting mode, both the first heat exchanger (501) and the second heat exchanger (502) are defrosted.

2. The heat exchange structure according to claim 1, characterized in that, The pipeline structure includes: The gas connection tube (8) is used to introduce gas into the pipeline structure or to lead out gas from the pipeline structure; Liquid connection pipe (7) is used to introduce liquid into the pipeline structure or to draw out liquid from the pipeline structure.

3. The heat exchange structure according to claim 1, characterized in that, The control module includes a control valve assembly, which includes at least one four-way valve. The control valve assembly is disposed within the pipeline structure to change the flow direction of fluid within the pipeline structure.

4. The heat exchange structure according to claim 3, characterized in that, The heat exchange structure also includes: The first connecting pipe has one end connected to the input end of the first heat exchanger (501) and the other end connected to the control valve group. The second connecting pipe has one end connected to the output end of the first heat exchanger (501) and the other end connected to the control valve group.

5. The heat exchange structure according to claim 3, characterized in that, The heat exchange structure also includes: The third connecting pipe has one end connected to the input end of the second heat exchanger (502) and the other end connected to the control valve group. The fourth connecting pipe has one end connected to the output end of the second heat exchanger (502) and the other end connected to the control valve group.

6. The heat exchange structure according to claim 5, characterized in that, The heat exchange structure also includes: Compressor (2); The fifth connecting pipe has one end connected to the air inlet of the compressor (2) and the other end connected to the control valve group; The sixth connecting pipe has one end connected to the air outlet of the compressor (2) and the other end connected to the control valve group.

7. The heat exchange structure according to claim 6, characterized in that, The heat exchange structure also includes a gas-liquid separator (1), which is disposed on the fifth connecting pipe.

8. The heat exchange structure according to claim 7, characterized in that, The control valve assembly includes a first four-way valve (301), a second four-way valve (302), and a third four-way valve (303); wherein, The D ends of the first four-way valve (301) and the third four-way valve (303) are respectively connected to the sixth connecting pipe; the E ends of the first four-way valve (301) and the second four-way valve (302) are respectively connected to the fifth connecting pipe; the D end of the second four-way valve (302) is connected to the S end of the third four-way valve (303); the E end of the third four-way valve (303) is connected to the liquid collecting end of the first heat exchanger (501); the first The C end of the three-way valve (303) is connected to the liquid pipe connection pipe (7); the S end of the first four-way valve (301) is connected to the gas pipe connection pipe (8); the C end of the first four-way valve (301) is connected to the gas collecting end of the first heat exchanger (501); the S end of the second four-way valve (302) is connected to the gas collecting end of the second heat exchanger (502); the C end of the second four-way valve (302) is connected to the gas collecting end of the first heat exchanger (501).

9. The heat exchange structure according to claim 8, characterized in that, The C end of the third four-way valve (303) is connected to the liquid pipe connecting pipe (7) through the first throttling component (401); The liquid collecting end of the second heat exchanger (502) is connected to the liquid pipe connecting pipe (7) through the second throttling component (402); The C end of the second four-way valve (302) is connected to the gas collecting end of the first heat exchanger (501) through the first control valve (601); The C end of the first four-way valve (301) is connected to the gas collecting end of the first heat exchanger (501) through the second control valve (602).

10. An air conditioner, comprising a heat exchange structure, characterized in that, The heat exchange structure is the heat exchange structure according to any one of claims 1 to 9.

11. A control method applicable to the heat exchange structure according to any one of claims 1 to 9, characterized in that, The heat exchange structure includes: Determine the operating mode of the heat exchange structure; When the heat exchange structure is in the refrigeration parallel mode, the first heat exchanger (501) and the second heat exchanger (502) are used for refrigeration, and the first heat exchanger (501) and the second heat exchanger (502) are connected in parallel. When the heat exchange structure is in the refrigeration series mode, the first heat exchanger (501) and the second heat exchanger (502) are used for refrigeration, and the first heat exchanger (501) and the second heat exchanger (502) are connected in series. When the heat exchange structure is in heating mode, the first heat exchanger (501) and the second heat exchanger (502) are used for heating; When the heat exchange structure is in the heating and defrosting mode, either the first heat exchanger (501) or the second heat exchanger (502) is used for heating, and the other of the first heat exchanger (501) or the second heat exchanger (502) is used for defrosting. When the heat exchange structure is in defrosting mode, both the first heat exchanger (501) and the second heat exchanger (502) defrost.

12. The control method according to claim 11, characterized in that, The control method includes: A first four-way valve (301), a second four-way valve (302), and a third four-way valve (303) are provided; wherein, The D ends of the first four-way valve (301) and the third four-way valve (303) are respectively connected to two pipelines branching off from the outlet of the compressor (2) of the heat exchange structure; the E ends of the first four-way valve (301) and the second four-way valve (302) are respectively connected to the inlet end of the gas-liquid separator (1) of the heat exchange structure; the D end of the second four-way valve (302) is connected to the S end of the third four-way valve (303); the E end of the third four-way valve (303) is connected to the first heat exchanger ( The liquid collection end of the first four-way valve (301) is connected to the liquid pipe connection pipe (7); the C end of the third four-way valve (303) is connected to the liquid pipe connection pipe (7); the S end of the first four-way valve (301) is connected to the gas pipe connection pipe (8); the C end of the first four-way valve (301) is connected to the gas collection end of the first heat exchanger (501); the S end of the second four-way valve (302) is connected to the gas collection end of the second heat exchanger (502); the C end of the second four-way valve (302) is connected to the gas collection end of the first heat exchanger (501).

13. The control method according to claim 12, characterized in that, When the heat exchange structure is in the refrigeration parallel mode, the coil of the first four-way valve (301) is de-energized, the DC terminal of the first four-way valve (301) is connected, and the ES terminal of the first four-way valve (301) is connected; the coils of the second four-way valve (302) and the third four-way valve (303) are energized, the DS terminals of the second four-way valve (302) and the third four-way valve (303) are connected, and the CE terminals of the second four-way valve (302) and the third four-way valve (303) are connected.

14. The control method according to claim 12, characterized in that, When the heat exchange structure is in the refrigeration series mode, the coils of the first four-way valve (301) and the third four-way valve (303) are de-energized, the DC terminals of the first four-way valve (301) and the third four-way valve (303) are both connected, and the ES terminals of the first four-way valve (301) and the third four-way valve (303) are both connected; the coil of the second four-way valve (302) is energized, and the DS terminal and the CE terminal of the second four-way valve (302) are connected.

15. The control method according to claim 12, characterized in that, When the heat exchange structure is in heating mode, the coils of the first four-way valve (301) and the third four-way valve (303) are both energized, the DS terminals of the first four-way valve (301) and the third four-way valve (303) are both connected, and the CE terminals of the first four-way valve (301) and the third four-way valve (303) are connected; the coil of the second four-way valve (302) is de-energized, the DC terminal of the second four-way valve (302) is connected, and the SE terminal of the second four-way valve (302) is connected.

16. The control method according to claim 12, characterized in that, When the heat exchange structure is in the heating and defrosting mode; the coils of the first four-way valve (301), the second four-way valve (302), and the third four-way valve (303) are all energized, the DS terminals of the first four-way valve (301), the second four-way valve (302), and the third four-way valve (303) are all connected, and the CE terminals of the first four-way valve (301), the second four-way valve (302), and the third four-way valve (303) are all connected; or, the coils of the first four-way valve (301) and the third four-way valve (303) are both energized, the DS terminals of the first four-way valve (301) and the third four-way valve (303) are connected, and the CE terminals of the first four-way valve (301) and the third four-way valve (303) are connected; the coil of the second four-way valve (302) is de-energized, the DC terminal of the second four-way valve (302) is connected, and the SE terminal of the second four-way valve (302) is connected.

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