Outdoor heat exchanger structure, air conditioning system including the same, and control method

Abstract

The present invention proposes an outdoor heat exchanger structure, an air-conditioning system and a control method thereof, wherein the outdoor heat exchanger structure includes an air collecting pipe assembly connected to a compressor, and the air collecting pipe assembly is divided into a first air collecting pipe part, a second air collecting pipe part and a third air collecting pipe part by a first control valve and a second control valve, wherein the first air collecting pipe part located at the upper end of the air collecting pipe assembly is connected to one end of the first heat exchanger, and the other end of the first heat exchanger is connected to the first liquid collecting pipe assembly, the second air collecting pipe part located between the first control valve and the second control valve is connected to one end of the second heat exchanger, and the other end of the second heat exchanger is connected to the second liquid collecting pipe assembly, the third air collecting pipe part located at the lower end of the air collecting pipe assembly is connected to one end of the third heat exchanger, and the other end of the third heat exchanger is connected to the third liquid collecting pipe assembly, wherein the windward area of ​​the three heat exchangers is positively correlated with the corresponding wind field effects.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an outdoor heat exchanger structure, an air conditioning system including the same, and a control method. Background Art

[0002] An air conditioner primarily consists of four parts: a compressor, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger. The first end of the outdoor heat exchanger is connected to the indoor heat exchanger via the compressor, while the second end is connected to the indoor heat exchanger via the throttling device. During cooling, the outdoor heat exchanger acts as a condenser, while the indoor heat exchanger acts as an evaporator. During heating, the outdoor heat exchanger acts as an evaporator, while the indoor heat exchanger acts as a condenser.

[0003] An existing outdoor heat exchanger flow path structure installs solenoid valves between some liquid headers, some gas headers, and the heat exchange flow path. By switching the solenoid valves on and off, the heat exchange flow paths can be switched in parallel or in series. While this method allows for flexible flow path switching, it doesn't account for the impact of wind field on heat exchange efficiency. This is particularly true for vertical heat exchangers with poor wind field at the bottom, where heat exchange is better in the upper layers. This can easily lead to accumulation of liquid refrigerant at the bottom, resulting in a low circulating refrigerant volume and poor heat exchange efficiency. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a multi-flow path outdoor heat exchanger structure.

[0005] The first aspect of the present invention provides an outdoor heat exchanger structure, including an air collecting pipe assembly connected to a compressor, wherein the air collecting pipe assembly is divided into a first air collecting pipe part, a second air collecting pipe part and a third air collecting pipe part by a first control valve and a second control valve, wherein the first air collecting pipe part located at the upper end of the air collecting pipe assembly is connected to one end of the first heat exchanger, and the other end of the first heat exchanger is connected to the first liquid collecting pipe assembly, the second air collecting pipe part located between the first control valve and the second control valve is connected to one end of the second heat exchanger, and the other end of the second heat exchanger is connected to the second liquid collecting pipe assembly, and the third air collecting pipe part located at the lower end of the second control valve and the air collecting pipe assembly is connected to one end of the third heat exchanger, and the other end of the third heat exchanger is connected to the third liquid collecting pipe assembly, wherein the windward area of ​​the three heat exchangers is positively correlated with the corresponding wind field effects.

[0006] In one embodiment, the first gas header portion is connected to one end of the first heat exchanger via a straight pipe, and the first heat exchanger is connected to the first liquid header assembly via a capillary tube;

[0007] The second gas collecting pipe portion is connected to one end of the second heat exchanger via a straight pipe, and the other end of the second heat exchanger is connected to the second liquid collecting pipe assembly via a capillary tube;

[0008] The third gas collecting pipe portion is connected to one end of the third heat exchanger through a straight pipe, and the other end of the third heat exchanger is connected to the third liquid collecting pipe assembly through a straight pipe.

[0009] In one embodiment, the outdoor heat exchanger structure also includes a third control valve and a fourth control valve, wherein one end of the third control valve is connected to the end of the first liquid collecting pipe assembly, and the other end is connected to the gas collecting pipe assembly, and is located on the side of the first control valve facing the second control valve; one end of the fourth control valve is connected to the end of the first liquid collecting pipe assembly, and the other end is connected to the end of the second liquid collecting pipe assembly.

[0010] In one embodiment, the outdoor heat exchanger structure further includes a throttling component, which is disposed between the third gas header portion and the first and second liquid header assemblies, and between the second control valve and the third gas header portion.

[0011] In one embodiment, the windward area of ​​the first heat exchanger is greater than the windward area of ​​the second heat exchanger and greater than the windward area of ​​the third heat exchanger.

[0012] In one embodiment, the third control valve and the fourth control valve may be replaced by three-way valves.

[0013] A second aspect of the present invention provides an air-conditioning system comprising the outdoor heat exchanger structure described in any one or any combination of the above.

[0014] In one embodiment, the air conditioning system further comprises a gas-liquid separator, a compressor and a four-way valve, and the upper end of the gas collecting pipe assembly of the outdoor heat exchanger is connected to the compressor via the four-way valve.

[0015] A third aspect of the present invention provides a method for controlling the above-mentioned air-conditioning system, comprising:

[0016] In cooling mode, the operating load of the air conditioning system includes three load levels, and the first load> the second load> the third load,

[0017] When it is determined that the air conditioner is at a first load, the first heat exchanger and the second heat exchanger are controlled to be in parallel flow path, the first control valve and the third control valve are opened, the second control valve and the fourth control valve are closed, and the throttling component is opened;

[0018] When the air conditioner is judged to be at the second load, the first heat exchanger and the second heat exchanger are controlled to be in series flow path, the second heat exchanger and the third heat exchanger are controlled to be in parallel flow path, the first control valve and the fourth control valve are closed, the second control valve and the third control valve are opened, and the throttling component is opened;

[0019] When the air conditioner is judged to be at the third load, the first heat exchanger, the second heat exchanger and the third heat exchanger are controlled to be a series flow path, the first control valve, the second control valve and the fourth control valve are closed, the third control valve is opened, and the throttling component is opened.

[0020] In one embodiment, the control method further includes: in the heating mode, the first heat exchanger and the second heat exchanger form a parallel flow path, controlling the first heat exchanger and the second heat exchanger to form a parallel flow path, opening the first control valve and the fourth control valve, closing the second control valve and the third control valve, and opening the throttling component.

[0021] Compared with the prior art, the structure of the multi-flow outdoor heat exchanger of the present invention has the following advantages:

[0022] 1. The gas collecting pipe is divided into three areas by control valves. Each area corresponds to an independent heat exchanger, and the windward area of ​​the heat exchanger is positively correlated with the wind field effect. The two heat exchangers corresponding to the best wind field effect can form parallel and series flow paths through valve components. The heat exchanger corresponding to the worst wind field effect is used as the subcooling section, and the heat exchanger corresponding to the subcooling section is connected to the gas collecting pipe and liquid collecting pipe ends with straight pipes. This not only makes full use of the distribution of the wind field to exert the heat exchange effect of the heat exchanger, but also avoids the problem of refrigerant accumulation and poor flow in the lower heat exchanger leading to poor heat exchange.

[0023] 2. In cooling mode, the flow path of the heat exchanger can be switched freely according to the operating load demand. The refrigerant flows from the gas collecting side to the liquid collecting side, maintaining countercurrent heat exchange with the outdoor wind direction to increase the heat exchange efficiency.

[0024] The above-mentioned technical features can be combined in various technically feasible ways to produce new embodiments, as long as the purpose of the present invention can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in more detail below based on non-limiting examples and with reference to the accompanying drawings, in which:

[0026] Figure 1 It shows a schematic structural diagram of an outdoor heat exchanger structure according to the present invention;

[0027] Figure 2 Shows Figure 1 Schematic diagram of parallel flow path of outdoor heat exchanger in cooling mode;

[0028] Figure 3 Shows Figure 1 Schematic diagram of the cooling mode series flow path of the outdoor heat exchanger;

[0029] Figure 4 Shows Figure 1Schematic diagram of the cooling mode series flow path of the outdoor heat exchanger;

[0030] Figure 5 Shows Figure 1 Schematic diagram of parallel flow path of outdoor heat exchanger in heating mode;

[0031] Figure 6 A schematic diagram showing the structure in which the third and fourth control valves in the outdoor heat exchanger are replaced by three-way valves.

[0032] In the drawings, like components are designated by like reference numerals, but the drawings are not necessarily drawn to scale.

[0033] Wherein, the accompanying drawings are marked as follows:

[0034] 1. Gas-liquid separator; 2. Compressor; 3. Four-way valve; 4. Outdoor heat exchanger; 5. Liquid-side pipeline; 6. Gas-side pipeline; 401. Gas collecting pipe assembly; 4011. First control valve; 4012. Second control valve; 402. Heat exchanger group; 4021. First heat exchanger; 4022. Second heat exchanger; 4023. Third heat exchanger; 403. Liquid collecting pipe assembly; 4031. First liquid collecting pipe assembly; 4032. Second liquid collecting pipe assembly; 4033. Third liquid collecting pipe assembly; 404. Third control valve; 405. Fourth control valve; 406. Throttling component; Three-way control valve 407. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, as long as no conflict exists, the various embodiments of the present invention and the various features in the embodiments can be combined with each other, and the resulting technical solutions are all within the scope of protection of the present invention.

[0036] Parts not described in the present invention can be implemented by adopting or drawing on existing technologies.

[0037] like Figure 1As shown, the first aspect of the present invention provides an outdoor heat exchanger structure. The outdoor heat exchanger 4 of the present invention includes an air collecting pipe assembly 401 connected to the compressor 2. The air collecting pipe assembly 401 is divided into a first air collecting pipe part, a second air collecting pipe part and a third air collecting pipe part by a first control valve 4011 and a second control valve 4012. The first air collecting pipe part located at the upper end of the air collecting pipe assembly 401 is connected to one end of the first heat exchanger 4021, and the other end of the first heat exchanger 4021 is connected to the first liquid collecting pipe assembly 4031. The second air collecting pipe portion between the first control valve 4011 and the second control valve 4012 is connected to one end of the second heat exchanger 4022, and the other end of the second heat exchanger 4022 is connected to the second liquid collecting pipe assembly 4032. The third air collecting pipe portion located at the lower end of the second control valve 4012 and the air collecting pipe assembly 401 is connected to one end of the third heat exchanger 4023, and the other end of the third heat exchanger 4023 is connected to the third liquid collecting pipe assembly 4033. The windward areas of the three heat exchangers are positively correlated with their corresponding wind field effects.

[0038] In the outdoor heat exchanger structure of the present invention, the frontal areas of the three heat exchangers in heat exchanger group 402 (first heat exchanger 4021, second heat exchanger 4022, and third heat exchanger 4023) are positively correlated with their corresponding wind field effects. That is, areas with better wind field effects have larger corresponding frontal areas, while areas with worse wind field effects have smaller corresponding frontal areas. For example, in a vertical heat exchanger with air outlet directly above the unit, the upper wind field effect is better than the lower wind field, and the corresponding frontal areas of the heat exchangers are: first heat exchanger 4021 > second heat exchanger 4022 > third heat exchanger 4023.

[0039] In a preferred embodiment, the first gas collecting pipe portion is connected to one end of the first heat exchanger 4021 via a straight pipe, and the first heat exchanger 4021 is connected to the first liquid collecting pipe assembly 4031 via a capillary tube;

[0040] The second gas collecting pipe portion is connected to one end of the second heat exchanger 4022 via a straight pipe, and the other end of the second heat exchanger 4022 is connected to the second liquid collecting pipe assembly 4032 via a capillary tube;

[0041] The third gas collecting pipe portion is connected to one end of the third heat exchanger 4023 through a straight pipe, and the other end of the third heat exchanger 4023 is connected to the third liquid collecting pipe assembly 4033 through a straight pipe.

[0042] In the present invention, the connecting pipes between the gas collecting pipe assembly 401 and the heat exchanger group 402 are connected by straight pipes without throttling and pressure reduction effects; in the heat exchanger group 402, the connecting pipes between the first heat exchanger and the second heat exchanger and the collecting pipe assembly 403 (the first collecting pipe assembly 4031, the second collecting pipe assembly 4032 and the third collecting pipe assembly 4033) are connected by capillary tubes with throttling and pressure reduction effects; the connecting pipes between the third heat exchanger 4023 and the collecting pipe assembly 403 are connected by straight pipes without throttling and pressure reduction effects.

[0043] The area with the weakest wind field is set as the supercooling section area (the area where the third heat exchanger 4023 is located), and the inlet and outlet pipes are both designed with straight pipe sections, which is conducive to the refrigerant after condensation in the upper heat exchanger to be supercooled again and flow out quickly, avoiding the accumulation of liquid refrigerant.

[0044] In a preferred embodiment, the outdoor heat exchanger structure of the present invention further includes a third control valve 404 and a fourth control valve 405. One end of the third control valve 404 is connected to one end of the first liquid manifold assembly 4031, and the other end is connected to the gas manifold assembly 401. The third control valve 404 is located on the side of the first control valve 4011 facing the second control valve 4012, i.e., connected to the second gas manifold. One end of the fourth control valve 405 is connected to the first liquid manifold assembly 4031, and the other end is connected to the second liquid manifold assembly 4032. The outdoor heat exchanger structure of the present invention, through the third control valve 404, the fourth control valve 405, and the first control valve 4011, realizes series and parallel flow paths between the first heat exchanger 4021 and the second heat exchanger 4022.

[0045] In one embodiment, the outdoor heat exchanger structure of the present invention further includes a throttling component 406, which is disposed between the third gas header portion and the first and second liquid header components, and between the second control valve and the third gas header portion.

[0046] The refrigerant flow path in the cooling mode of the outdoor heat exchanger structure of the present invention is as follows:

[0047] The operating load is divided into three load levels: first load > second load > third load.

[0048] When the air conditioner is judged to be at the first load, the first heat exchanger 4021 and the second heat exchanger 4022 are parallel flow paths. Figure 2As shown, first control valve 4011 and third control valve 404 are open, second control valve 4012 and fourth control valve 405 are closed, and throttling component 406 is open. High-temperature, high-pressure gaseous refrigerant passes through manifold assembly 401 (first and second manifold sections) and simultaneously enters first heat exchanger 4021 and second heat exchanger 4022 for heat exchange. It then passes through liquid manifold assembly 403, enters throttling component 406, and then passes through manifold assembly 401 (third manifold section) to enter third heat exchanger 4023 for further heat exchange and subcooling, achieving a greater degree of subcooling before entering the indoor space through liquid-side pipeline 5.

[0049] When the air conditioner is judged to be in the second load, the first heat exchanger 4021 and the second heat exchanger 4022 form a series flow path, and in order to speed up the circulation of the refrigerant, the second heat exchanger 4022 and the third heat exchanger 423 form a series and parallel double flow path. Figure 3 As shown, first control valve 4011 and fourth control valve 405 are closed, second control valve 4012 and third control valve 404 are open, and throttling component 406 is open. High-temperature, high-pressure gaseous refrigerant passes through the manifold, undergoes heat exchange in first heat exchanger 4021, and then returns to manifold assembly 401 through third control valve 404. There, it splits into two paths. The first path undergoes heat exchange again through second heat exchanger 4022. After the second heat exchange, the refrigerant returns to manifold assembly 401 again through throttling component 406. The first path passes through second control valve 4012 and merges with the refrigerant returning from the first path before being subcooled through third heat exchanger 4023, achieving a greater degree of subcooling and entering the indoor space through liquid-side pipeline 5.

[0050] When the air conditioner is judged to be in the third load, the first heat exchanger 4021, the second heat exchanger 4022, and the third heat exchanger 4023 are connected in series. Figure 4 As shown, first control valve 4011, second control valve 4012, and fourth control valve 405 are closed, third control valve 404 is open, and throttling component 406 is open. High-temperature, high-pressure gaseous refrigerant passes through the manifold, undergoes heat exchange in first heat exchanger 4021, and then returns to manifold assembly 401 through third control valve 404. It undergoes further heat exchange in second heat exchanger 4022. After the second heat exchange, the refrigerant returns to manifold assembly 401 through throttling component 406, is subcooled in third heat exchanger 4023, and enters the indoor space through liquid-side pipeline 5 with a greater degree of subcooling.

[0051] In cooling mode, the operating load is divided into three zones. When the load demand is highest, the upper two heat exchange zones switch to parallel flow paths. When the load demand is moderate, the upper two heat exchange zones switch to series flow paths, and the second heat exchanger and the third heat exchanger, which serves as the subcooling zone, switch to a dual flow path of parallel and series. When the load demand is lowest, all three heat exchangers switch to a pure series configuration. The heat exchanger is adaptable to different load demands. Regardless of the flow path, cooling is countercurrent heat exchange, with the refrigerant flow direction opposite to the outdoor wind direction, achieving full countercurrent heat exchange and improving heat exchange efficiency.

[0052] The refrigerant flow control in heating mode is as follows:

[0053] like Figure 5 As shown, the first heat exchanger 4021 and the second heat exchanger 4022 form a parallel flow path, the first control valve 4011 and the fourth control valve 405 are open, the second control valve 4012 and the third control valve 404 are closed, and the throttling component 406 is open. During heating, the medium-pressure refrigerant passing through the indoor side returns to the third heat exchanger 4023 via the liquid-side pipeline 5 for subcooling. It then passes through the throttling component 406 and enters the first heat exchanger 4021 and the second heat exchanger 4022 simultaneously to evaporate the refrigerant. The evaporated gaseous refrigerant returns to the suction side via the gas-side pipeline 6.

[0054] In an alternative embodiment, the third control valve and the fourth control valve may be implemented by using three-way valves instead.

[0055] like Figure 6 As shown, end b of three-way control valve 407 is connected to the end of the first liquid header assembly 4031 of the first heat exchanger 4021, end a of three-way control valve 407 is connected to the end of the second liquid header assembly 4032 of the second heat exchanger 4022, end c is connected to the end of the gas header where the first control valve 4011 is located, and end d has no flow path. By switching the connection between end b and end a or c, parallel or series flow paths between the first heat exchanger 4021 and the second heat exchanger 4022 are achieved.

[0056] Specifically, when end b is connected to end c, the third control valve 404 is open and the fourth control valve 405 is closed; when end b is connected to end a, the third control valve 404 is closed and the fourth control valve 405 is open. The specific refrigerant flow path is not described here.

[0057] A second aspect of the present invention provides an air-conditioning system comprising the outdoor heat exchanger structure described in any one or any combination of the above.

[0058] Therefore, the air conditioning system of the present invention has all the beneficial effects that can be achieved by the above-mentioned outdoor heat exchanger structure.

[0059] In a specific embodiment, the air conditioning system further includes a gas-liquid separator 1 , a compressor 2 and a four-way valve 3 , and the upper end of the gas collecting pipe assembly 401 of the outdoor heat exchanger 4 is connected to the compressor 2 through the four-way valve 3 .

[0060] A third aspect of the present invention provides a method for controlling the above-mentioned air-conditioning system, comprising:

[0061] The operating load is divided into three load levels: first load > second load > third load.

[0062] When the air conditioner is judged to be at the first load, the first heat exchanger 4021 and the second heat exchanger 4022 are controlled to be in parallel flow path, the first control valve 4011 and the third control valve 404 are controlled to be open, the second control valve 4012 and the fourth control valve 405 are controlled to be closed, and the throttling component 406 is opened;

[0063] When the air conditioner is judged to be at the second load, the first heat exchanger 4021 and the second heat exchanger 4022 are controlled to form a series flow path, and the second heat exchanger 4022 and the third heat exchanger 4023 form a series and parallel double flow path. The first control valve 4011 and the fourth control valve 405 are controlled to be closed, the second control valve 4012 and the third control valve 404 are controlled to be open, and the throttling component 406 is opened.

[0064] When it is determined that the air conditioner is at the third load, the first heat exchanger 4021, the second heat exchanger 4022, and the third heat exchanger 4023 are controlled to be a series flow path, the first control valve 4011, the second control valve 4012, and the fourth control valve 405 are controlled to be closed, the third control valve 404 is opened, and the throttling component 406 is opened.

[0065] In one embodiment, the control method further includes: in the heating mode, controlling the first heat exchanger 4021 and the second heat exchanger 4022 to form a parallel flow path, opening the first control valve 4011 and the fourth control valve 405, closing the second control valve 4012 and the third control valve 404, and opening the throttling component 406.

[0066] For the specific flow path, please refer to the above description of the outdoor heat exchanger structure flow path, which will not be repeated here.

[0067] Unless otherwise defined, technical or scientific terms used in this invention should have the same ordinary meaning as those having ordinary skills in the field to which this invention belongs. The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are simply used to distinguish different components. Words such as "include" or "comprising" mean that the element or object preceding the word includes the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0068] At this point, those skilled in the art will recognize that although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. An outdoor heat exchanger structure, characterized in that: The invention also provides a method for providing a heat exchanger and a heat dissipation device for heating the heat exchanger to the heat exchanger, wherein the heat exchanger is connected to the heat exchanger pipe assembly and the heat exchanger pipe assembly is connected to the first heat exchanger pipe assembly and the heat exchanger pipe assembly is connected to the heat exchanger pipe assembly. The method further provides a method for providing a heat exchanger and a heat dissipation device for heating the heat exchanger to the heat exchanger pipe assembly. The outdoor heat exchanger structure further includes a third control valve and a fourth control valve, wherein one end of the third control valve is connected to the first liquid header assembly end of the first heat exchanger, and the other end is connected to the gas header assembly, and is located on the side of the first control valve facing the second control valve; one end of the fourth control valve is connected to the first liquid header assembly end of the first heat exchanger, and the other end is connected to the second liquid header assembly end; The outdoor heat exchanger structure further includes a throttling component, which is arranged between the third gas collecting pipe portion and the first and second liquid collecting pipe components, and is located between the second control valve and the third gas collecting pipe portion.

2. The outdoor heat exchanger structure according to claim 1, characterized in that: The third gas collecting pipe portion is connected to one end of the third heat exchanger through a straight pipe, and the other end of the third heat exchanger is connected to the third liquid collecting pipe assembly through a straight pipe.

3. The outdoor heat exchanger structure according to claim 2, characterized in that: The first gas collecting pipe portion is connected to one end of the first heat exchanger via a straight pipe, and the first heat exchanger is connected to the first liquid collecting pipe assembly via a capillary tube; The second gas collecting pipe portion is connected to one end of the second heat exchanger through a straight pipe, and the other end of the second heat exchanger is connected to the second liquid collecting pipe assembly through a capillary tube.

4. The outdoor heat exchanger structure according to claim 1, characterized in that: The windward area of ​​the first heat exchanger is greater than the windward area of ​​the second heat exchanger and greater than the windward area of ​​the third heat exchanger.

5. The outdoor heat exchanger structure according to claim 1, characterized in that: The third control valve and the fourth control valve can be replaced by three-way valves.

6. An air conditioning system, characterized in that: The outdoor heat exchanger structure comprises the outdoor heat exchanger structure according to any one of claims 1 to 5.

7. The air conditioning system according to claim 6, characterized in that The air conditioning system further comprises a gas-liquid separator, a compressor and a four-way valve. The upper end of the gas collecting pipe assembly of the outdoor heat exchanger is connected to the compressor through the four-way valve.

8. A method for controlling an air conditioning system according to claim 6 or 7, characterized in that: include: In cooling mode, the operating load of the air conditioning system includes three load levels, and the first load> the second load> the third load, When it is determined that the air conditioner is at a first load, the first heat exchanger and the second heat exchanger are controlled to be in parallel flow path, the first control valve and the fourth control valve are opened, the second control valve and the third control valve are closed, and the throttling component is opened; When the air conditioner is judged to be at the second load, the first heat exchanger and the second heat exchanger are controlled to be in series flow path, the second heat exchanger and the third heat exchanger are controlled to be in parallel flow path, the first control valve and the fourth control valve are closed, the second control valve and the third control valve are opened, and the throttling component is opened; When the air conditioner is judged to be at the third load, the first heat exchanger, the second heat exchanger and the third heat exchanger are controlled to be a series flow path, the first control valve, the second control valve and the fourth control valve are closed, the third control valve is opened, and the throttling component is opened.

9. The control method of the air conditioning system according to claim 8, characterized in that: Also includes: In the heating mode, the first heat exchanger and the second heat exchanger are controlled to form a parallel flow path, the first control valve and the fourth control valve are opened, the second control valve and the third control valve are closed, and the throttling component is opened.

Images