Heat exchange structure, air conditioner and control method

Abstract

The invention provides a heat exchange structure, an air conditioner and a control method. The heat exchange structure comprises a first heat exchanger and a second heat exchanger, a second heat exchanger; the pipeline structure is connected with the first heat exchanger and the second heat exchanger; and the control module is used for controlling the flow direction of fluid in the pipeline structure, so that the heat exchange structure has a refrigeration parallel connection mode, a refrigeration series connection mode, a heating mode, a heating defrosting mode and a defrosting mode. The heat exchange structure solves the technical problem that a heat exchanger structure with an alternate defrosting function in the prior art is poor in heat exchange effect.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and in particular to a heat exchange structure, an air conditioner and a control method. Background Art

[0002] In the prior art, there is already an outdoor heat exchanger structure with a heat exchanger defrosting function. The details are as follows:

[0003] 1) By setting solenoid valves between some liquid collecting pipes, some gas collecting pipes and heat exchanger flow paths, the parallel or series form of the heat exchange flow paths can be realized by changing the on and off of the solenoid valves. However, this method fails to take into account the rotation defrosting of the outdoor heat exchanger in the heating mode, and fails to maximize the function of the heat exchanger under the series-parallel flow paths.

[0004] 2) Through the structure of double four-way valves and double outdoor heat exchangers, the rotation defrosting of the double outdoor heat exchangers is realized by switching the flow path between the four-way valve and the outdoor heat exchanger. However, this method fails to take into account the different heat exchanger volumes required for different operating loads in the cooling mode, fails to realize the series-parallel flow path of the heat exchanger, and fails to maximize the cooling capacity under different operating loads.

[0005] Therefore, the prior art needs to be further developed. Summary of the invention

[0006] The purpose of the present invention is to overcome the above 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 of the heat exchanger structure with a rotating defrosting function in the related art.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: a heat exchange structure is provided, comprising: a first heat exchanger; a second heat exchanger; a pipeline structure, the pipeline structure is connected to the first heat exchanger and the second heat exchanger; a control module, 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; wherein, when the heat exchange structure is in the refrigeration parallel mode, the first heat exchanger and the second heat exchanger are used for refrigeration, and the first heat exchanger is used for heating. The heat exchanger is connected in parallel with the second heat exchanger; when the heat exchange structure is in a cooling series mode, the first heat exchanger and the second heat exchanger are used for cooling, 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, any one of the first heat exchanger and the second heat exchanger is used for heating, and the other of the first heat exchanger and 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.

[0008] Furthermore, the pipeline structure includes: a gas pipe connecting pipe, which is used to introduce gas into the pipeline structure or to lead out gas in the pipeline structure; and a liquid pipe connecting pipe, which is used to introduce liquid into the pipeline structure or to lead out liquid in the pipeline structure.

[0009] Furthermore, the control module includes a control valve group, which includes at least one four-way valve. The control valve group is arranged in the pipeline structure to change the flow direction of the fluid in the pipeline structure through the control valve group.

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

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

[0013] Furthermore, the heat exchange structure also includes a gas-liquid separator, and the gas-liquid separator is arranged on the fifth connecting pipeline.

[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 pipeline; the E ends of the first four-way valve and the second four-way valve are respectively connected to the fifth connecting pipeline; 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 comprises a heat exchange structure, wherein the heat exchange structure is the above-mentioned heat exchange structure.

[0017] A control method is applicable to the above-mentioned heat exchange structure, and the heat exchange structure includes: judging which working mode the heat exchange structure is in; when the heat exchange structure is in a cooling parallel mode, the first heat exchanger and the second heat exchanger are used for cooling, and the first heat exchanger is connected in parallel with the second heat exchanger; when the heat exchange structure is in a cooling series mode, the first heat exchanger and the second heat exchanger are used for cooling, and the first heat exchanger is connected in series with the second heat exchanger; 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 defrost mode, any one of the first heat exchanger and the second heat exchanger is used for heating, and the other of the first heat exchanger and the second heat exchanger is defrosted; when the heat exchange structure is in a defrost mode, both the first heat exchanger and the second heat exchanger are defrosted.

[0018] Furthermore, 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 branched from the air 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 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.

[0019] Furthermore, when the heat exchange structure is in the cooling parallel mode, the coil of the first four-way valve is powered off, the DC end of the first four-way valve is connected, and the ES end of the first four-way valve is connected; the coils of the second four-way valve and the third four-way valve are powered on, the DS ends of the second four-way valve and the third four-way valve are connected, and the CE ends of the second four-way valve and the third four-way valve are 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 powered off, the DC ends of the first four-way valve and the third four-way valve are connected, and the ES ends of the first four-way valve and the third four-way valve are connected; the coil of the second four-way valve is powered on, the DS end of the second four-way valve is connected, and the CE end of the second four-way valve is connected.

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

[0022] Further, when the heat exchange structure is in the 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, the DS ends of the first four-way valve, the second four-way valve and the third four-way valve are all connected, and the CE ends of the first four-way valve, the second four-way valve and the third four-way valve are all connected; or, the coils of the first four-way valve and the third four-way valve are all energized, the DS ends of the first four-way valve and the third four-way valve are connected, and the CE ends of the first four-way valve and the third four-way valve are connected; the coil of the second four-way valve is powered off, the DC end of the second four-way valve is connected, and the SE end of the second four-way valve is connected.

[0023] Beneficial effects:

[0024] The heat exchange structure of this embodiment includes: a first heat exchanger; a second heat exchanger; a pipeline structure, the pipeline structure is connected to the first heat exchanger and the second heat exchanger; a control module, 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 cooling parallel mode, a cooling series mode, a heating mode, a heating defrosting mode and a defrosting mode; wherein, when the heat exchange structure is in the cooling parallel mode, the first heat exchanger and the second heat exchanger are used for cooling, and the first heat exchanger is connected in parallel with the second heat exchanger; when the heat exchange structure is in the cooling series mode, the first heat exchanger and the second heat exchanger are used for cooling, and the first heat exchanger is connected in series with the second heat exchanger; when the heat exchange structure is in the heating mode, the first heat exchanger and the second heat exchanger are used for heating; when the heat exchange structure is in the heating defrosting mode, any one of the first heat exchanger and the second heat exchanger is used for heating, and the other of the first heat exchanger and the second heat exchanger is defrosted; when the heat exchange structure is in the defrosting mode, both the first heat exchanger and the second heat exchanger are defrosted. The heat exchange structure of the present invention adopts a variety of defrosting flow paths, which can be used as needed to ensure indoor comfort and solve the technical problem of poor heat exchange effect of the heat exchanger structure with rotation defrosting function. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

[0031] Figure 7 It is a structural schematic diagram of the heat exchange structure adopted in the embodiment of the present invention when it is in the defrosting mode.

[0032] The above drawings 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 connecting pipe; 8. Gas pipe connecting pipe. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work 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. Figures 1 to 7, including: a first heat exchanger 501; a second heat exchanger 502; a pipeline structure, the pipeline structure is connected to the first heat exchanger 501 and the second heat exchanger 502; a control module, 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; wherein, 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 is connected in parallel with the second heat exchanger 502; when the heat exchange structure is in the refrigeration series mode, the first heat exchanger 501 and the second heat exchanger 502 are connected in parallel; In the connection 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 defrost mode, any one of the first heat exchanger 501 and 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 defrost mode, both the first heat exchanger 501 and the second heat exchanger 502 are defrosted.

[0036] Specifically, during conventional defrosting, the indoor unit is in a shutdown state, and the refrigerant flowing through the indoor side will absorb indoor heat, which reduces the comfort level. The heat exchange structure of this embodiment can realize the rotation defrosting of the heat exchanger during defrosting. When the heating conditions are not severe, the rotation defrosting of the outdoor heat exchanger is adopted. During the rotation defrosting, the indoor unit can maintain the heating mode operation. The comfort level is relatively high. For heating operation under severe conditions, when the outdoor heat exchanger frosts quickly and the degree of frost is large, the rotation defrosting of the outdoor heat exchanger cannot ensure the comfort level, because if the heat exchanger is used for rotation defrosting under severe conditions, on the one hand, the defrosting time is long, and on the other hand, when one heat exchanger is defrosted, the heat exchanger that has completed defrosting will frost quickly, so that the performance of the unit is reduced. Therefore, a conventional defrosting flow path is used under severe conditions. The heat exchange structure of this embodiment adopts a variety of defrosting flow paths, which can be used as needed to ensure indoor comfort and solve the technical problem of poor heat exchange effect of the heat exchanger structure with rotation defrosting function.

[0037] In the heat exchange structure of this embodiment, see Figure 1 The pipeline structure includes: a gas pipe connecting pipe 8, which is used to pass gas into the pipeline structure or to lead gas out of the pipeline structure; a liquid pipe connecting pipe 7, which is used to pass liquid into the pipeline structure or to lead liquid out of the pipeline structure. In this way, the heat exchange structure achieves the effect of external cooling and heating by inputting and outputting refrigerants in different states, thereby improving the comfort of indoor temperature control.

[0038] See also Figure 1In the heat exchange structure of this embodiment, the control module includes a control valve group, the control valve group includes at least one four-way valve, and the control valve group is arranged in the pipeline structure to change the flow direction of the fluid in the pipeline structure through the control valve group. Specifically, the four-way valve is a more common valve body and has a strong ability to switch pipelines, thereby helping to achieve a variety of pipeline connection methods.

[0039] In the heat exchange structure of this embodiment, see Figure 1 The heat exchange structure further includes: a first connecting pipeline, 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; a second connecting pipeline, 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. In this way, by providing the first connecting pipeline and the second connecting pipeline, the first heat exchanger 501 is connected to the control valve group, which helps to control the input and output directions of the first heat exchanger 501.

[0040] In the heat exchange structure of this embodiment, see Figure 1 The heat exchange structure further includes: a third connecting pipeline, 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; a fourth connecting pipeline, 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. In this way, by providing the third connecting pipeline and the fourth connecting pipeline, the second heat exchanger 502 is connected to the control valve group, which helps to control the input and output directions of the second heat exchanger 502.

[0041] See also Figure 1 In the heat exchange structure of this embodiment, the heat exchange structure further includes: a compressor 2; a fifth connecting pipeline, 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; a sixth connecting pipeline, 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. In this way, by setting the sixth connecting pipeline, the high-pressure fluid output by the compressor 2 is passed into different pipelines, thereby realizing different functions.

[0042] See also Figure 1 In the heat exchange structure of this embodiment, the heat exchange structure further includes a gas-liquid separator 1, which is arranged on the fifth connecting pipeline. The gas-liquid separator 1 is arranged to discharge the liquid in the fluid, which can improve the working efficiency of the compressor.

[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; 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 pipeline; the E ends of the first four-way valve 301 and the second four-way valve 302 are respectively connected to the fifth connecting pipeline; 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 pipe connecting pipe 7; the S end of the first four-way valve 301 is connected to the gas pipe 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; 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 up three four-way valves, while meeting the various cooling and heating needs of the heat exchange structure, the two flow paths can be switched in the cooling mode, and the heating mode can meet the defrosting work of a single or all heat exchangers, meeting 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 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. With the above arrangement, the flow rate and on-off in the pipeline can be controlled, thereby adjusting the working conditions of various functions, thereby improving the working efficiency of the heat exchange structure.

[0045] The air conditioner of this embodiment includes a heat exchange structure, and the heat exchange structure is the above-mentioned heat exchange structure. In the air conditioner of this embodiment, the above-mentioned heat exchange structure is used, and the cooling mode can realize the series and parallel flow paths of the outdoor heat exchanger, which is suitable for flow path switching under multi-load scenarios to achieve more efficient cooling. When the heating mode is running, the outdoor heat exchanger runs in parallel flow paths to ensure sufficient evaporation to avoid or reduce frosting; the defrosting state can realize the rotation defrosting of the heat exchanger and the continuous heating of the indoor unit, thereby improving the effect of indoor comfort.

[0046] The control method of this embodiment is applicable to the above-mentioned heat exchange structure, and the heat exchange structure includes: judging which working mode the heat exchange structure is in; when the heat exchange structure is in the cooling parallel 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 the cooling series 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, any one of the first heat exchanger 501 and 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.

[0047] With the above method, the indoor unit is in a shutdown state during conventional defrosting, and the refrigerant flowing through the indoor side will absorb indoor heat, which reduces the comfort level. The heat exchange structure of this embodiment can realize the rotation defrosting of the heat exchanger during defrosting. When the heating conditions are not severe, the rotation defrosting of the outdoor heat exchanger is adopted, and the indoor unit can maintain the heating mode operation during the rotation defrosting. The comfort level is relatively high. For heating operation under severe conditions, when the outdoor heat exchanger frosts quickly and the degree of frost is large, the rotation defrosting of the outdoor heat exchanger cannot ensure the comfort level, because if the heat exchanger is used for rotation defrosting under severe conditions, on the one hand, the defrosting time is long, and on the other hand, when one heat exchanger is defrosted, the heat exchanger that has completed defrosting will frost quickly, so that the performance of the unit is reduced. Therefore, a conventional defrosting flow path is used under severe conditions. The heat exchange structure of this embodiment adopts a variety of defrosting flow paths, which can be used as needed to ensure indoor comfort and solve the technical problem of poor heat exchange effect of the heat exchanger structure with rotation 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 branched from the air 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 liquid collecting end of the first heat exchanger 501; the C end of the third four-way valve 303 is connected to the liquid pipe connecting pipe 7; the S end of the first four-way valve 301 is connected to the gas pipe 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; 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 up three four-way valves, while meeting the various cooling and heating requirements of the heat exchange structure, the switching of the two flow paths can be realized in the cooling mode, and the heating mode can meet the defrosting work of a single or all heat exchangers, meeting the requirements of efficient cooling and heating of different operating loads.

[0049] In the control method of this embodiment, when the heat exchange structure is in the cooling parallel mode, the coil of the first four-way valve 301 is powered off, the DC end of the first four-way valve 301 is connected, and the ES end 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 powered, the DS ends of the second four-way valve 302 and the third four-way valve 303 are connected, and the CE ends of the second four-way valve 302 and the third four-way valve 303 are connected. In this way, when the cooling requirement is not high, the cooling efficiency of the heat exchange structure is improved by using two heat exchangers in parallel.

[0050] In the control method of this embodiment, when the heat exchange structure is in the cooling series mode, the coils of the first four-way valve 301 and the third four-way valve 303 are powered off, the DC ends of the first four-way valve 301 and the third four-way valve 303 are connected, and the ES ends 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 powered, the DS end of the second four-way valve 302 is connected, and the CE end of the second four-way valve 302 is connected. In this way, when the cooling requirement is high, the cooling method of two heat exchangers in series is adopted to meet the cooling demand.

[0051] In the control method of this embodiment, when the heat exchange structure is in the heating mode, the coils of the first four-way valve 301 and the third four-way valve 303 are both powered, the DS ends of the first four-way valve 301 and the third four-way valve 303 are connected, and the CE ends 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 powered off, the DC end of the second four-way valve 302 is connected, and the SE end of the second four-way valve 302 is connected. In this way, the heating needs of users can be met.

[0052] In the control method of this embodiment, 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 powered, the DS ends 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 ends 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 all powered, the DS ends of the first four-way valve 301 and the third four-way valve 303 are connected, and the CE ends 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 powered off, the DC end of the second four-way valve 302 is connected, and the SE end of the second four-way valve 302 is connected. In this way, through the above structure, the function of heating while defrosting the first heat exchanger 501 or the second heat exchanger 502 can be realized.

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

[0054] See also Figure 1 The outdoor heat exchanger adopts a two-stage design, which is divided into an outdoor first heat exchanger 501 and an outdoor second heat exchanger 502; the first throttling component 401 serves as a refrigerant flow control component of the outdoor first heat exchanger 501, and is connected to the outdoor first heat exchanger 501 through the third four-way valve 303, which can control the flow and also control the on-off to realize the switching of the refrigeration series and parallel flow paths. The second throttling component 402 serves as a refrigerant flow control component of the outdoor second heat exchanger 502, and is directly connected to the outdoor second heat exchanger 502. Based on the outdoor second heat exchanger, the parallel and series flow paths of the outdoor first heat exchanger and the outdoor second heat exchanger are realized in the cooling mode through the switching of valve components; in the heating mode, the two rotate to defrost. The system is equipped with three four-way valves, and the multi-flow path function is realized through the four-way valve and double-layer outdoor heat exchanger design. The specific structure is shown as follows:

[0055] The gas-liquid separator 1 is connected to the suction side pipeline of the compressor 2, and the exhaust side of the compressor 2 is divided into two paths, 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 collecting 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 collecting 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 collecting end of the outdoor second heat exchanger 502, and the C end is connected to the gas collecting 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 As shown, it is the parallel flow path of the outdoor heat exchanger in cooling mode. In this flow path, the first four-way valve coil is powered off, the DC end is connected, and the ES end is connected; the second and third four-way valve coils are powered, the DS end is connected, and the CE end is connected. The second control valve 602 is opened, and the first control valve 601 is closed. The first throttling component 401 is opened, and the second throttling component 402 is opened. The gaseous refrigerant returned from the indoor unit returns to the gas-liquid separator 1 through the gas pipe connecting pipe 8 for gas-liquid separation, and then enters the compressor 2 for compression. The high-temperature and high-pressure refrigerant is divided into two paths. One path passes through the DC end 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 enters the CE end of the third four-way valve 303 through the first throttling component 401 and returns to the liquid pipe connecting pipe 7. The other path passes through the DS end of the third four-way valve 303 and enters the DS end of the second four-way valve 302 to enter the outdoor second heat exchanger 502 for condensation. The condensed refrigerant returns to the liquid pipe connecting pipe 7 through the second throttling component 402. At this time, both refrigerants converge at the liquid pipe connecting pipe 7 and enter the indoor side.

[0059] Figure 3 As shown, it is the series flow path of the outdoor heat exchanger in the cooling mode. In this flow path, the coils of the first and third four-way valves are powered off, the DC end is connected and the ES end is connected; the coil of the second four-way valve 302 is powered, the DS end is connected and the CE end is connected. The second control valve 602 is opened and the first control valve 601 is closed. The first throttle component 401 is closed and the second throttle component 402 is opened. The gaseous refrigerant returned from the indoor unit returns to the gas-liquid separator 1 through the gas pipe connecting pipe 8 for gas-liquid separation, and then enters the compressor 2 for compression. The high-temperature and high-pressure refrigerant passes through the DC end of the first four-way valve 301 and the second control valve 602 to enter the outdoor first heat exchanger 501 for primary condensation. The condensed refrigerant enters the SE end of the third four-way valve 303, and then enters the outdoor second heat exchanger 502 through the DS end of the second four-way valve 302 for secondary condensation. The condensed refrigerant returns to the liquid pipe connecting pipe 7 through the second throttle component 402, and then enters the indoor side to achieve refrigeration.

[0060] like Figure 4As shown, it is the heating mode flow path. In this flow path, the first and third four-way valve coils are energized, the DS end is connected and the CE end is connected; the second four-way valve 302 coil is de-energized, the DC end is connected and the SE end is connected. The second control valve 602 is opened and the first control valve 601 is closed. The first throttling component 401 is opened and the second throttling component 402 is opened. The liquid refrigerant returned from the indoor unit is divided into two paths through the liquid pipe connecting pipe 7. One path enters the CE end 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 end 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 end of the second four-way valve 302 and returns to the inlet pipe of the gas-liquid separator 1. The two refrigerants merge at the inlet of the gas-liquid separator 1, enter the compressor through the gas-liquid separator 1, and the high-pressure refrigerant compressed by the compressor 2 enters the gas pipe connecting pipe 8 through the first four-way valve 301DS end, and then enters the indoor side to achieve heating.

[0061] Figure 5 As shown, it is a continuous heating and outdoor second heat exchanger 502 defrosting flow path. In this flow path, the first, second, and third four-way valve coils are energized, and the DS end and the CE end are connected. The second control valve 602 is opened and the first control valve 601 is closed. The first throttling component 401 is opened and the second throttling component 402 is opened. The high-pressure and high-temperature refrigerant compressed by the compressor 2 is divided into two paths. One path enters the gas pipe connecting pipe 8 through the DS end of the first four-way valve 301, enters the indoor side for heating, and realizes the effect of continuous heating of the indoor unit in the defrosting state; the other path enters the outdoor second heat exchanger 502 for defrosting through the DS end of the third four-way valve 303 and the DS end of the second four-way valve 302 in sequence. The liquid refrigerant after condensation on the indoor side and the outdoor second heat exchanger 502 converges at the liquid pipe connecting pipe 7, enters the third four-way valve 303CE end through the first throttling component 401, and enters the outdoor first heat exchanger 501 to evaporate. The evaporated low-pressure and low-temperature refrigerant enters the first four-way valve 301CE end 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 6As shown, it is a continuous heating and outdoor first heat exchanger 501 defrosting flow path. In this flow path, the first and third four-way valve coils are energized, and the DS end and the CE end are connected; the second four-way valve 302 coil is powered off, and the DC end and the SE end are connected. The second control valve 602 is closed and the first control valve 601 is opened. The first throttle component 401 is opened, and the second throttle component 402 is opened. The high-pressure and high-temperature refrigerant compressed by the compressor 2 is divided into two paths. One path enters the gas pipe connecting pipe 8 through the DS end of the first four-way valve 301, enters the indoor side for heating, and realizes the effect of continuous heating of the indoor unit in the defrosting state; the other path enters the outdoor first heat exchanger 501 through the DS end of the third four-way valve 303, the DC end of the second four-way valve 302, and the first control valve 601 in sequence for defrosting. The defrosted liquid refrigerant then enters the liquid pipe connecting pipe 7 through the CE end of the third four-way valve 303 and the first throttle component 401, and merges 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, and the evaporated refrigerant enters the second four-way valve 302SE end and returns to the gas-liquid separator 1. The separated gaseous refrigerant enters the compressor for compression, and the cycle continues.

[0063] See also Figure 7 , which is a conventional defrosting flow path. This flow path is consistent with the parallel flow path of the refrigeration heat exchanger in Figure 1, and will not be repeated here.

[0064] The system flow path design can realize the series-parallel flow path switching of the cooling heat exchanger, and the rotation defrosting or overall defrosting of the heating heat exchanger. It can be applied to operation in multiple scenarios and improve the cooling or heating capacity.

[0065] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

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

[0067] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0068] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0069] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A heat exchange structure, characterized in that: include: A first heat exchanger (501); A second heat exchanger (502); a pipeline structure, the pipeline structure being connected to both the first heat exchanger (501) and the second heat exchanger (502); A control module, 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 cooling parallel mode, a cooling series mode, a heating mode, a heating defrosting mode and a defrosting mode; When the heat exchange structure is in a cooling parallel 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 cooling series 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, any one of the first heat exchanger (501) and 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 a 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 comprises: A gas pipe connecting pipe (8), used for introducing gas into the pipeline structure or leading gas out of the pipeline structure; The liquid pipe connecting pipe (7) is used to introduce liquid into the pipe structure or to lead liquid out of the pipe structure.

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

4. The heat exchange structure according to claim 3, characterized in that: The heat exchange structure also includes: a first connecting pipeline, 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; A second connecting pipeline, 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.

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

6. The heat exchange structure according to claim 5, characterized in that: The heat exchange structure also includes: Compressor (2); a fifth connecting pipeline, 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; A sixth connecting pipeline, 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.

7. The heat exchange structure according to claim 6, characterized in that: The heat exchange structure further comprises a gas-liquid separator (1), and the gas-liquid separator (1) is arranged on the fifth connecting pipeline.

8. The heat exchange structure according to claim 7, characterized in that: The control valve group comprises 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 pipeline; the E ends of the first four-way valve (301) and the second four-way valve (302) are respectively connected to the fifth connecting pipeline; 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 three-way valve (303) is connected to the liquid pipe connecting pipe (7); the S end of the first four-way valve (301) is connected to the gas pipe 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).

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) via a 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 a 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 comprises: Determining the working mode of the heat exchange structure; When the heat exchange structure is in a cooling parallel 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 cooling series 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 and defrosting mode, any one of the first heat exchanger (501) and 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 used for defrosting; When the heat exchange structure is in the defrosting mode, both the first heat exchanger (501) and the second heat exchanger (502) are defrosted.

12. The control method according to claim 11, characterized in that: The control method comprises: 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 branched from the gas 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 third four-way valve (303) is connected to the liquid collecting end of the heat exchanger (501); the C end of the third four-way valve (303) is connected to the liquid pipe connecting pipe (7); the S end of the first four-way valve (301) is connected to the gas pipe 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).

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 powered off, the DC end of the first four-way valve (301) is connected, and the ES end 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 powered, the DS ends of the second four-way valve (302) and the third four-way valve (303) are connected, and the CE ends 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 powered off, the DC ends of the first four-way valve (301) and the third four-way valve (303) are connected, and the ES ends 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 powered on, the DS end of the second four-way valve (302) is connected, and the CE end of the second four-way valve (302) is connected.

15. The control method according to claim 12, characterized in that: When the heat exchange structure is in the heating mode, the coils of the first four-way valve (301) and the third four-way valve (303) are both powered, the DS ends of the first four-way valve (301) and the third four-way valve (303) are both connected, and the CE ends 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 powered off, the DC end of the second four-way valve (302) is connected, and the SE end 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 powered, the DS ends 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 ends 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 all powered, the DS ends of the first four-way valve (301) and the third four-way valve (303) are connected, and the CE ends 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 powered off, the DC end of the second four-way valve (302) is connected, and the SE end of the second four-way valve (302) is connected.

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