Air conditioning system

Abstract

The invention relates to the technical field of air conditioners, and discloses an air conditioning system which comprises an outdoor heat exchanger and an indoor heat exchanger, and further comprises a liquid storage heat exchanger, a first heat exchanger, a second heat exchanger, a first heat exchanger, a second heat exchanger and a second heat exchanger, the liquid storage heat exchanger comprises a first medium channel and a second medium channel, and the first medium channel can exchange heat with the second medium channel; the outdoor heat exchanger communicates with the indoor heat exchanger through a first medium channel. A liquid storage tank; the first end of the upstream liquid taking branch communicates between the outdoor heat exchanger and the first medium channel, and the second end of the upstream liquid taking branch communicates with the lower portion of the liquid storage tank. The upstream liquid taking branch is sequentially provided with a first electromagnetic valve and a first throttling device; the first end of the downstream liquid taking branch is communicated between the first medium channel and the indoor heat exchanger, and the second end of the downstream liquid taking branch is communicated between the first electromagnetic valve and the first throttling device; the downstream liquid taking branch is provided with a second electromagnetic valve; the first end of the drainage branch is communicated with the upper part of the liquid storage tank, and the second end of the drainage branch is communicated with the second medium channel; and the liquid discharge branch is provided with a second throttling device.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, for example, to an air conditioning system. Background Art

[0002] Air conditioners are a very common electrical appliance that can operate in cooling or heating mode to regulate indoor temperature. They are widely used in a variety of living or working environments such as homes, offices, and shopping malls.

[0003] In the air conditioner disclosed in the related art, the heat exchange coefficient of the condenser is large during cooling, and the liquid refrigerant content inside the condenser increases. However, the refrigerant flow rate required by the evaporator is small at this time, that is, the actual refrigerant flow rate is greater than the refrigerant flow rate required by the system.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] The refrigerant flow rate in the refrigerant circulation loop of the air conditioner is fixed, but the optimal amount of refrigerant required by the air conditioner in different modes is different, so the energy efficiency of this type of air conditioner is poor.

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

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

[0008] The disclosed embodiment provides an air conditioning system, which solves the problem of poor energy efficiency of the air conditioner caused by fixed refrigerant flow in the refrigerant circulation loop.

[0009] In some embodiments, the air conditioning system includes an outdoor heat exchanger and an indoor heat exchanger, and further includes:

[0010] The liquid storage heat exchanger includes a first medium channel and a second medium channel, and the first medium channel can exchange heat with the second medium channel, and the second medium channel is connected to the air supply port of the compressor; and the outdoor heat exchanger is connected to the indoor heat exchanger through the first medium channel;

[0011] Fluid storage tank;

[0012] The upstream liquid intake branch has a first end connected between the outdoor heat exchanger and the first medium channel, and a second end connected to the lower part of the liquid storage tank; and the upstream liquid intake branch is provided with a first solenoid valve and a first throttling device in sequence;

[0013] A downstream liquid intake branch, a first end of which is connected between the first medium channel and the indoor heat exchanger, and a second end of which is connected between the first solenoid valve and the first throttling device; and a second solenoid valve is provided on the downstream liquid intake branch;

[0014] The first end of the liquid discharge branch is connected to the upper part of the liquid storage tank, and the second end of the liquid discharge branch is connected to the second medium channel; and the liquid discharge branch is provided with a second throttling device.

[0015] The air conditioning system provided by the embodiment of the present disclosure can achieve the following technical effects:

[0016] When the air conditioning system is cooling, part of the liquid refrigerant enters the liquid storage tank. After this part of the refrigerant is temporarily stored in the liquid storage tank, the amount of refrigerant participating in the circulation in the refrigerant circulation loop is reduced. In this way, energy efficiency loss is effectively reduced under refrigeration conditions. When the air conditioning system is heating, the refrigerant temporarily stored in the liquid storage tank flows to the second medium channel. In addition, the refrigerant in the second medium channel can exchange heat with the refrigerant in the first medium channel, thereby increasing the gas content in the second medium channel, and finally flows to the air supply port of the compressor to replenish the compressor.

[0017] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0019] Figure 1 is a schematic diagram of an air conditioning system according to a first embodiment of the present disclosure;

[0020] Figure 2 is a schematic diagram of an air conditioning system according to a second embodiment provided by an embodiment of the present disclosure;

[0021] Figure 3 is a schematic diagram of an air conditioning system according to a third embodiment of the present disclosure;

[0022] Figure 4 is a schematic diagram of a refrigerant path of a liquid storage four-way valve when storing liquid provided in an embodiment of the present disclosure;

[0023] Figure 5 is a schematic diagram of the refrigerant path of the liquid storage four-way valve during liquid discharge provided by an embodiment of the present disclosure;

[0024] Figure 6 It is a schematic diagram of an air conditioning system after integrating multiple embodiments provided by the embodiments of the present disclosure.

[0025] Reference numerals:

[0026] 100: compressor; 110: four-way reversing valve; 120: outdoor heat exchanger; 130: liquid storage heat exchanger; 131: first medium channel; 132: second medium channel; 140: indoor heat exchanger; 150: gas-liquid separator;

[0027] 200: liquid storage tank; 210: upstream liquid intake branch; 220: downstream liquid intake branch; 230: liquid discharge branch; 240: liquid storage four-way valve; 241: first port; 242: second port; 243: third port; 244: fourth port;

[0028] 300: outdoor throttling device; 310: indoor throttling device; 320: first throttling device; 330: second throttling device; 340: first solenoid valve; 350: second solenoid valve; 360: third solenoid valve; 370: fourth solenoid valve. DETAILED DESCRIPTION

[0029] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0030] The terms "first", "second", etc. in the specification and claims of the disclosed embodiments and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate to describe the disclosed embodiments here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0032] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0033] Unless otherwise stated, the term "plurality" means two or more.

[0034] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0035] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0037] Combination Figure 1-6 As shown, an embodiment of the present disclosure provides an air conditioning system, including a compressor 100, a four-way reversing valve 110, an outdoor heat exchanger 120, a liquid storage heat exchanger 130 and an indoor heat exchanger 140. The liquid storage heat exchanger 130 includes a first medium channel 131 and a second medium channel 132, and the first medium channel 131 can exchange heat with the second medium channel 132. The outdoor heat exchanger 120 is connected to the indoor heat exchanger 140 through the first medium channel 131. In addition, an outdoor throttling device 300 is provided between the outdoor heat exchanger 120 and the first medium channel 131, and an indoor throttling device 310 is provided between the first medium channel 131 and the indoor heat exchanger 140.

[0038] In this embodiment, when the air conditioning system is cooling, the outdoor throttling device 300 is fully opened without throttling, and the indoor throttling device 310 is throttling. At this time, the refrigerant circulation circuit is: compressor 100, four-way reversing valve 110, outdoor heat exchanger 120, liquid storage heat exchanger 130, indoor heat exchanger 140 and compressor 100. When the air conditioning system is heating, the outdoor throttling device 300 is throttling, and the indoor throttling device 310 is fully opened without throttling. At this time, the refrigerant circulation circuit is: compressor 100, four-way reversing valve 110, indoor heat exchanger 140, liquid storage heat exchanger 130, outdoor heat exchanger 120 and compressor 100.

[0039] Optionally, the outdoor throttling device 300 is an electronic expansion valve. The indoor throttling device 310 is an electronic expansion valve.

[0040] In the first embodiment, if Figure 1 As shown, the air conditioning system further includes a liquid storage tank 200, an upstream liquid intake branch 210 and a liquid discharge branch 230. The first end of the upstream liquid intake branch 210 is connected between the outdoor heat exchanger 120 and the first medium channel 131, and the second end thereof is connected to the lower part of the liquid storage tank 200; and the upstream liquid intake branch 210 is provided with a first throttling device 320; the first end of the liquid discharge branch 230 is connected to the upper part of the liquid storage tank 200, and the second end thereof is connected to the second medium channel 132; and the liquid discharge branch 230 is provided with a second throttling device 330. In addition, the second medium channel 132 of the liquid storage heat exchanger 130 is connected to the air supply port of the compressor 100, for supplying air to the compressor 100.

[0041] In this embodiment, the air conditioning system uses the liquid storage tank 200 to store liquid when cooling, and the outdoor throttling device 300 is fully opened and the indoor throttling device 310 is throttled. The air conditioning system uses the liquid storage tank 200 to discharge liquid when heating, and the outdoor throttling device 300 is throttled and the indoor throttling device 310 is fully opened. In this way, the refrigerant flow in the refrigerant circulation loop is adaptively adjusted to improve the energy efficiency of the air conditioning system. In addition, the states of the indoor throttling device 310 and the outdoor throttling device 300 in the following second, third and fourth embodiments are all the same.

[0042] When the air conditioning system is cooling, since the outdoor throttling device 300 is fully open without throttling, the outdoor heat exchanger 120 discharges liquid refrigerant and flows to the first medium channel 131. At this time, part of the liquid refrigerant enters the liquid storage tank 200 through the upstream liquid intake branch 210. After this part of the refrigerant is temporarily stored in the liquid storage tank 200, the amount of refrigerant participating in the circulation in the refrigerant circulation loop is reduced. In this way, energy efficiency loss is effectively reduced under cooling conditions.

[0043] When the air conditioning system is heating, the refrigerant temporarily stored in the liquid storage tank 200 flows to the second medium channel 132 through the drainage branch 230. In addition, the refrigerant in the second medium channel 132 can exchange heat with the refrigerant in the first medium channel 131, thereby increasing the gas content in the second medium channel 132, and finally flows to the air replenishment port of the compressor 100 to replenish the compressor 100.

[0044] Optionally, the upstream liquid intake branch 210 is provided with a first solenoid valve 340, and the first solenoid valve 340 is located upstream of the first throttling device 320. When the first solenoid valve 340 is opened, the upstream liquid intake branch 210 is connected; when the first solenoid valve 340 is closed, the upstream liquid intake branch 210 is closed.

[0045] Optionally, the second end of the upstream liquid taking branch 210 is connected to the side of the lower part of the liquid storage tank 200. In this way, it is beneficial to store the liquid in the liquid storage tank 200.

[0046] Optionally, the first end of the drainage branch 230 is connected to the top surface of the upper part of the liquid storage tank 200. In this way, it is beneficial to fill the liquid storage tank 200 with liquid and fully utilize the volume of the liquid storage tank 200. In addition, when there is gas mixed in the liquid storage tank 200, the gas can be discharged through the drainage branch 230.

[0047] Optionally, the second medium channel 132 is connected to the air supply port of the compressor 100 through the gas-liquid separator 150. In this way, the refrigerant flowing out of the liquid storage tank 200 exchanges heat with the first medium channel 131 in the second medium channel 132 and then flows to the gas-liquid separator 150. Under the action of the gas-liquid separator 150, the gaseous refrigerant flows to the compressor 100 for air supply, thereby reducing the impact of the liquid refrigerant on the compressor 100.

[0048] Optionally, the liquid storage heat exchanger 130 includes a plate heat exchanger.

[0049] Optionally, the air conditioning system further includes a controller electrically connected to the first throttling device 320 and the second throttling device 330 , and configured to control the opening degrees of the first throttling device 320 and the second throttling device 330 .

[0050] In the second embodiment, if Figure 2 As shown, the air conditioning system further includes a liquid storage tank 200, a downstream liquid intake branch 220 and a liquid discharge branch 230. The first end of the downstream liquid intake branch 220 is connected between the first medium channel 131 and the indoor heat exchanger 140, and the second end thereof is connected to the lower part of the liquid storage tank 200; and the downstream liquid intake branch 220 is provided with a first throttling device 320; the first end of the liquid discharge branch 230 is connected to the upper part of the liquid storage tank 200, and the second end thereof is connected to the second medium channel 132; and the liquid discharge branch 230 is provided with a second throttling device 330. In addition, the second medium channel 132 of the liquid storage heat exchanger 130 is connected to the air supply port of the compressor 100, for supplying air to the compressor 100.

[0051] Compared with the first embodiment, in which the upstream liquid taking branch 210 is used to take liquid from the upstream of the first medium channel 131, in the second embodiment, the liquid storage tank 200 uses the downstream liquid taking branch 220 to take liquid from the downstream of the first medium channel 131. Since the first medium channel 131 exchanges heat with the second medium channel 132, the temperature of the refrigerant in the downstream of the first medium channel 131 is relatively low and the gas content is higher than that in the upstream and downstream of the first medium channel 131. Therefore, the state of the temporarily stored refrigerant in the liquid storage tank 200 is different due to different liquid taking positions.

[0052] Optionally, the downstream liquid intake branch 220 is provided with a second solenoid valve 350, and the second solenoid valve 350 is located upstream of the first throttling device 320. When the second solenoid valve 350 is opened, the downstream liquid intake branch 220 is connected; when the second solenoid valve 350 is closed, the downstream liquid intake branch 220 is closed.

[0053] Optionally, the air conditioning system further includes a controller electrically connected to the first throttling device 320 and the second throttling device 330 , and configured to control the opening degrees of the first throttling device 320 and the second throttling device 330 .

[0054] Optionally, the controller is configured to: when storing liquid, first control the first throttling device 320 to be fully closed and the second throttling device 330 to be fully open for a first time, then control the first throttling device 320 and the second throttling device 330 to be fully open for a second time, then control the opening of the second throttling device 330 to gradually decrease to fully closed along the first trend, and finally control the first throttling device 320 to be fully closed.

[0055] In this embodiment, when storing liquid, the first throttling device 320 is fully opened and the second device is fully closed in order to discharge the refrigerant remaining in the liquid storage tank 200. Then, the first throttling device 320 and the second throttling device 330 are both fully opened in order to fill the liquid storage tank 200 with liquid refrigerant. Then, the second throttling device 330 is gradually reduced to fully closed in order to gradually block the liquid discharge branch 230 and reduce the impact of the sudden drop in flow on the compressor 100. Finally, the first throttling device 320 is fully closed in order to block the downstream liquid intake branch 220, thereby completing liquid storage.

[0056] Optionally, the first throttling device 320 is an electronic expansion valve, the number of steps when fully open is 480 steps, and the number of steps when fully closed is 0 steps. In addition, the first throttling device 320 is normally closed.

[0057] Optionally, the second throttling device 330 is an electronic expansion valve, the number of steps when fully open is 480 steps, and the number of steps when fully closed is 0 steps. In addition, the second throttling device 330 is normally closed.

[0058] Optionally, the first time is 20 seconds and the second time is 20 seconds.

[0059] Optionally, the first trend is that the opening of the second throttling device 330 decreases from 480 steps, 250 steps, 100 steps to 0 step in sequence.

[0060] Exemplarily, after the air-conditioning system operates normally for 60 seconds, the controller controls the first throttling device 320 to be fully closed and the second throttling device 330 to be fully opened for 20 seconds, and then the first throttling device 320 and the second throttling device 330 are both fully opened for 20 seconds; then the opening of the second throttling device 330 is reduced to 250 steps and lasts for 20 seconds, then reduced to 100 steps and lasts for 20 seconds, and then reduced to 0 steps; finally, the first throttling device 320 is fully closed.

[0061] Optionally, when the liquid storage tank 200 does not need to be filled and only part of the space is needed to store the refrigerant, the duration of the second throttling device 330 being opened in the first trend can be appropriately reduced, and the number of changes can be reduced. Preferably, it is reduced to 1 / 2-1 / 3 of the duration when the refrigerant needs to be filled.

[0062] For example, after the air conditioning system operates normally for 60 seconds, the controller controls the first throttling device 320 to be fully closed and the second throttling device 330 to be fully opened for 20 seconds, and then the first throttling device 320 and the second throttling device 330 are both fully opened for 20 seconds; then the opening of the second throttling device 330 is reduced to 250 steps and maintained for 10 seconds, and then reduced to 0 steps; finally, the first throttling device 320 is fully closed. In this way, in the same system, when the volume of the liquid storage tank 200 remains unchanged, compared with the above example, the liquid storage tank 200 is not filled.

[0063] Optionally, the controller is configured to: when discharging liquid, first control the first throttling device 320 to be fully closed, then control the second throttling device 330 to gradually increase to be fully open according to the second trend, and finally control the second throttling device 330 to be fully closed.

[0064] In this embodiment, the purpose of first controlling the first throttling device 320 to be fully closed during liquid discharge is to block the upstream liquid replenishment branch. Then, the purpose of gradually increasing the second throttling device 330 to be fully open in the second trend is to gradually discharge the refrigerant in the liquid storage tank 200 and reduce the impact of the sudden increase in flow on the compressor 100. Finally, the purpose of fully closing the second throttling device 330 is to block the liquid discharge branch 230, thereby completing the liquid discharge.

[0065] Optionally, the number of steps when the second throttling device 330 is fully opened is 480 steps, and the number of steps when it is fully closed is 0 step; the second trend is that the opening of the second throttling device 330 increases from 0 steps, 100 steps, 250 steps to 480 steps in sequence.

[0066] For example, after the air conditioning system operates normally for 60 seconds, the controller controls the first throttling device 320 to be fully closed; then the opening of the second throttling device 330 increases from 0 steps to 100 steps for 20 seconds, then increases to 250 steps for 20 seconds, then increases to 480 steps for 20 seconds. Finally, the second throttling device 330 is fully closed.

[0067] Optionally, when the refrigerant in the liquid storage tank 200 does not need to be completely discharged, the duration of opening the second throttling device 330 in the second trend can be appropriately reduced, and the number of changes can be reduced. Preferably, it is reduced to 1 / 2-1 / 3 of the duration when the refrigerant needs to be fully filled.

[0068] For example, after the air conditioning system operates normally for 60 seconds, the controller controls the first throttling device 320 to be fully closed; then the opening of the second throttling device 330 increases from 0 steps to 100 steps for 10 seconds, and then increases to 250 steps for 10 seconds. Finally, the second throttling device 330 is fully closed.

[0069] Optionally, in the first embodiment and the second embodiment, the controllers for the liquid storage process and the liquid discharge process control the first throttling device 320 and the second throttling device 330 in the same way.

[0070] In the third embodiment, if Figure 3 As shown, the air conditioning system further includes a liquid storage tank 200 and a liquid storage four-way valve 240. The liquid storage four-way valve 240 includes a first port 241, a second port 242, a third port 243 and a fourth port 244, wherein the first port 241 is connected between the outdoor heat exchanger 120 and the first medium channel 131; the second port 242 is connected to the lower part of the liquid storage tank 200, the third port 243 is connected to the second medium channel 132, and the fourth port 244 is connected to the upper part of the liquid storage tank 200 through the first throttling device 320; Figure 4 As shown, when storing liquid, the first opening 241 is connected to the second opening 242, and the third opening 243 is connected to the fourth opening 244; Figure 5 As shown, during discharge, the first port 241 is connected to the fourth port 244, and the second port 242 is connected to the third port 243. In addition, the second medium channel 132 of the liquid storage heat exchanger 130 is connected to the air supply port of the compressor 100 for supplying air to the compressor 100.

[0071] In this embodiment, when storing and discharging liquid, the connection state of the four ports is controlled so that the refrigerant is injected into and discharged from the liquid storage tank 200 through different paths. The different paths can improve the performance of the liquid storage tank 200 under corresponding working conditions.

[0072] When the air conditioning system is cooling, part of the refrigerant in the refrigerant circulation loop enters the liquid storage tank 200 through the first port 241 and the second port 242 in sequence. In addition, the gas when the liquid storage tank 200 is not full and the liquid after it is filled can flow to the second medium channel 132 through the first throttling device 320, the fourth port 244 and the third port 243 in sequence. In this way, the refrigerant in the liquid storage tank 200 enters from the bottom and exits from the top, which is conducive to filling the liquid during liquid storage and facilitating the gas to be discharged from the liquid storage tank 200. When the air conditioner is heating, part of the refrigerant in the refrigerant circulation loop enters the liquid storage tank 200 through the first port 241, the fourth port 244 and the first throttling device 320 in sequence. In addition, the refrigerant in the liquid storage tank 200 flows to the second medium channel 132 through the second port 242 and the third port 243 in sequence. In this way, the refrigerant enters from the top and exits from the bottom, which is conducive to emptying the refrigerant from the liquid storage tank 200.

[0073] In this embodiment, the liquid storage tank 200 is used to store part of the refrigerant, and the refrigerant flow in the refrigerant circulation loop is adaptively adjusted, thereby improving the energy efficiency of the air conditioning system. In addition, the refrigerant in the second medium channel 132 can exchange heat with the refrigerant in the first medium channel 131, thereby increasing the gaseous refrigerant content in the second medium channel 132, which is convenient for replenishing the compressor 100.

[0074] Optionally, the liquid storage four-way valve 240 is vertically arranged, and its second port 242, third port 243 and fourth port 244 are arranged in sequence from top to bottom, and the first port 241 and the third port 243 are located on the same horizontal plane. In this way, when storing liquid, the refrigerant flows upward from the first port 241 into the second port 242, and when discharging liquid, the refrigerant flows downward from the first port 241 into the fourth port 244.

[0075] Optionally, the second opening 242 is located on the same horizontal plane as the bottom of the liquid storage tank 200 . In addition, the second opening 242 is connected to the side surface of the lower part of the liquid storage tank 200 .

[0076] Optionally, when the liquid storage four-way valve 240 is powered on, the first port 241 is connected to the second port 242, and the third port 243 is connected to the fourth port 244; when the liquid storage four-way valve 240 is powered off, the first port 241 is connected to the fourth port 244, and the second port 242 is connected to the third port 243.

[0077] In this embodiment, the liquid storage four-way valve 240 is electrically connected to the controller, and the controller is used to control the state of the liquid storage four-way valve 240. When the liquid storage tank 200 is used to store liquid, the liquid storage four-way valve 240 is controlled to be powered on; when the liquid storage tank 200 is used to discharge liquid, the liquid storage four-way valve 240 is controlled to be powered off.

[0078] Optionally, the first port 241 is connected between the outdoor heat exchanger 120 and the first medium channel 131 through the third solenoid valve 360. Thus, when the third solenoid valve 360 ​​is opened, the refrigerant flows to the first port 241; when the third solenoid valve 360 ​​is closed, the first port 241 is blocked.

[0079] Optionally, the air conditioning system further includes a controller, which is electrically connected to the first throttling device 320 and is used to control the opening degree of the first throttling device 320 .

[0080] Optionally, the controller is configured to: when storing liquid, first control the first throttling device 320 to be fully open for a third time, then to be open at the first degree for a fourth time, and finally to be fully closed.

[0081] In this embodiment, the purpose of first controlling the first throttling device 320 to be fully opened during liquid storage is to fill the liquid storage tank 200 with refrigerant. Then, the purpose of throttling the first throttling device 320 at the first opening is to increase the gas content in the second medium channel 132. Finally, the purpose of fully closing the first throttling device 320 is to block the refrigerant from flowing to the second medium channel 132, thus completing liquid storage.

[0082] Optionally, the number of steps when the first throttling device 320 is fully opened is 480 steps, and the number of steps when it is fully closed is 0 steps; the first opening degree is 200 steps, and the fourth time is 10s.

[0083] For example, after the air conditioning system operates normally for 60 seconds, the controller controls the liquid storage four-way valve 240 to be powered on. Then, the controller controls the first throttling device 320 to be fully opened for 10 seconds. Then, the first throttling device 320 continues for 10 seconds at 200 steps. Finally, the first throttling device 320 is fully closed.

[0084] Optionally, when the liquid storage tank 200 does not need to be filled and only a part of the space is needed to store the refrigerant, the duration of the full opening of the first throttling device 320 can be appropriately shortened. Preferably, it is shortened to 1 / 2-1 / 3 of the duration when the refrigerant needs to be filled.

[0085] Optionally, the controller is configured to: when discharging liquid, first control the first throttling device 320 to maintain the second opening for a fifth time, then gradually reduce the opening according to the third trend, and finally fully close.

[0086] In this embodiment, the purpose of first controlling the first throttling device 320 to throttle at the second opening when draining is to fill gas into the liquid storage tank 200 and use the gas to squeeze the liquid toward the second port 242. Then, the purpose of gradually reducing the opening of the first throttling device 320 at the third trend is to fully throttle the refrigerant so that the gas fills the liquid storage tank 200. Finally, the purpose of fully closing the first throttling device 320 is to block the refrigerant from flowing to the liquid storage tank 200, thereby completing the draining.

[0087] Optionally, the second opening is 200 steps, and the fifth time is 30 seconds. The third trend is that the opening of the second throttling device 330 decreases from 200 steps, 150 steps to 100 steps in sequence.

[0088] For example, after the air conditioning system operates normally for 60 seconds, the controller controls the liquid storage four-way valve 240 to be powered off. Then, the controller controls the first throttling device 320 to last for 30 seconds at 200 steps. Then, the first throttling device 320 to last for 20 seconds at 150 steps. Then, the first throttling device 320 to last for 20 seconds at 100 steps. Finally, the first throttling device 320 is fully closed.

[0089] Optionally, when the refrigerant in the liquid storage tank 200 does not need to be completely discharged, the duration of opening the first throttling device 320 in the third trend can be appropriately reduced, and the number of changes can be reduced. Preferably, it is reduced to 1 / 2-1 / 3 of the duration when the refrigerant needs to be fully filled.

[0090] For example, after the air conditioning system operates normally for 60 seconds, the controller controls the liquid storage four-way valve 240 to be powered off. Then, the controller controls the first throttling device 320 to be powered on at 200 steps for 30 seconds. Then, the first throttling device 320 is powered on at 150 steps for 10 seconds. Finally, the first throttling device 320 is fully closed. In this way, part of the refrigerant in the liquid storage tank 200 can be discharged.

[0091] In the fourth embodiment, if Figure 6 As shown, the air conditioning system further includes a liquid storage tank 200, an upstream liquid intake branch 210, a downstream liquid intake branch 220 and a liquid discharge branch 230. The first end of the upstream liquid intake branch 210 is connected between the outdoor heat exchanger 120 and the first medium channel 131, and the second end thereof is connected to the lower part of the liquid storage tank 200; and the upstream liquid intake branch 210 is provided with a first solenoid valve 340 and a first throttling device 320 in sequence; the first end of the downstream liquid intake branch 220 is connected between the first medium channel 131 and the indoor heat exchanger 140, and the second end thereof is connected between the first solenoid valve 340 and the first throttling device 320; and the downstream liquid intake branch 220 is provided with a second solenoid valve 350; the first end of the liquid discharge branch 230 is connected to the upper part of the liquid storage tank 200, and the second end thereof is connected to the second medium channel 132; and the liquid discharge branch 230 is provided with a second throttling device 330. Furthermore, the second medium channel 132 of the liquid storage heat exchanger 130 is connected to the air supply port of the compressor 100 for supplying air to the compressor 100 .

[0092] In this embodiment, the air conditioning system uses the liquid storage tank 200 to store liquid during refrigeration. At this time, the upstream liquid extraction branch 210 can be used to inject refrigerant into the liquid storage tank 200, or the downstream liquid extraction branch 220 can be used to inject refrigerant into the liquid storage tank 200, or the upstream liquid extraction branch 210 and the downstream liquid extraction branch 220 can be used to inject refrigerant into the liquid storage tank 200 at the same time. In this way, the air conditioning system has multiple liquid extraction positions, which is convenient for selecting unused liquid extraction positions in different scenarios. Furthermore, the refrigerant flow in the refrigerant circulation loop can be adaptively adjusted, thereby improving the energy efficiency of the air conditioning system.

[0093] Optionally, the drain branch 230 is provided with a fourth solenoid valve 370 , and the fourth solenoid valve 370 is located between the liquid storage tank 200 and the second throttling device 330 .

[0094] Alternatively, if Figure 6As shown, the air-conditioning system also includes a liquid storage four-way valve 240, which includes a first port 241, a second port 242, a third port 243 and a fourth port 244, wherein the first port 241 is connected to the upstream liquid intake branch 210 through the third solenoid valve 360, and is located upstream of the first solenoid valve 340; the second port 242 is connected to the upstream liquid intake branch 210, and is located downstream of the first throttling device 320; the third port 243 is connected to the liquid discharge branch 230, and is located between the fourth solenoid valve 370 and the second throttling device 330; the fourth port 244 is connected to the liquid discharge branch 230 through the first throttling device 320, and is located between the liquid storage tank 200 and the fourth solenoid valve 370.

[0095] In this embodiment, in order to optimize the refrigerant flow path and the liquid collection position, the first embodiment, the second embodiment and the third embodiment are integrated through the system layout. In this way, the liquid collection position can be selected according to the needs, and the refrigerant flow path can be optimized by using the liquid storage four-way valve 240 when draining the liquid.

[0096] Optionally, the air conditioning system includes a first mode, which corresponds to the first solenoid valve 340 and the fourth solenoid valve 370 being both opened, and the second solenoid valve 350 and the third solenoid valve 360 ​​being both closed.

[0097] In this embodiment, the first mode corresponds to the liquid storage and discharge process in the first embodiment, and the control of the first throttling device 320 and the second throttling device 330 is as shown in the corresponding control of the first embodiment, which will not be repeated here.

[0098] Optionally, the air conditioning system includes a second mode, and the second mode corresponds to that the second solenoid valve 350 and the fourth solenoid valve 370 are both opened, and the first solenoid valve 340 and the third solenoid valve 360 ​​are both closed.

[0099] In this embodiment, the second mode corresponds to the liquid storage and discharge process in the second embodiment, and the control of the first throttling device 320 and the second throttling device 330 is as shown in the corresponding control of the second embodiment, which will not be repeated here.

[0100] Optionally, the air conditioning system includes a third mode, and the third mode corresponds to the third solenoid valve 360 ​​being opened, and the first solenoid valve 340 , the second solenoid valve 350 , and the fourth solenoid valve 370 being closed.

[0101] In this embodiment, in the third mode, the second throttling device 330 is fully opened. The third mode corresponds to the liquid storage and discharge process in the third embodiment, and the control of the first throttling device 320 is as shown in the corresponding control of the third embodiment, which will not be repeated here.

[0102] Optionally, the air conditioning system further includes a controller. The controller is electrically connected to the first solenoid valve 340, the second solenoid valve 350, the third solenoid valve 360 ​​and the fourth solenoid valve 370, and is used to control the switch states of the four solenoid valves. In this way, the air conditioning system can operate in the first mode, the second mode or the third mode by controlling the four solenoid valves by the controller.

[0103] Optionally, the liquid storage process of any of the first mode, the second mode or the third mode can be matched with the liquid discharge process of another of the three modes. It can be understood that each mode has a liquid storage stage and a liquid discharge stage, and it is only necessary to adopt the control of the corresponding mode in a certain stage.

[0104] For example, in the scenario where the gas content in the liquid storage tank 200 is required to be high during liquid storage and the liquid in the liquid storage tank 200 is required to be emptied during liquid discharge, the liquid storage stage of the second mode is combined with the liquid discharge stage of the third mode. During liquid storage, the controller controls the second solenoid valve 350 and the fourth solenoid valve 370 to be opened, and the first solenoid valve 340 and the third solenoid valve 360 ​​to be closed; and the first throttling device 320 is controlled to be fully closed and the second throttling device 330 is fully opened for a first time, and then the first throttling device 320 and the second throttling device 330 are controlled to be fully opened for a second time, and then the opening of the second throttling device 330 is controlled to gradually decrease to fully closed with a first trend, and finally the first throttling device 320 is controlled to be fully closed. During liquid discharge, the controller controls the third solenoid valve 360 ​​to be opened, and the first solenoid valve 340, the second solenoid valve 350 and the fourth solenoid valve 370 are all closed; and the first throttling device 320 is controlled to be opened at the second opening for a fifth time, and then the opening is gradually reduced with a third trend, and finally fully closed. In this way, the second mode is used to take liquid from the downstream of the first medium channel 131, so the gas content of the refrigerant entering the liquid storage tank 200 is relatively high; the third mode is used to make the throttled gas enter from top and exit from bottom, which is beneficial to squeeze out all the liquid in the liquid storage tank 200.

[0105] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An air conditioning system, comprising an outdoor heat exchanger (120) and an indoor heat exchanger (140), Characterized in that, It further comprises: A liquid storage heat exchanger (130), including a first medium channel (131) and a second medium channel (132), and the first medium channel (131) can exchange heat with the second medium channel (132), and the second medium channel (132) is connected to the gas supplement port of the compressor (100); and, the outdoor heat exchanger (120) is connected to the indoor heat exchanger (140) through the first medium channel (131); A liquid storage tank (200); An upstream liquid extraction branch (210), its first end is connected between the outdoor heat exchanger (120) and the first medium channel (131), and its second end is connected to the lower part of the liquid storage tank (200); and, the upstream liquid extraction branch (210) is successively provided with a first solenoid valve (340) and a first throttling device (320); A downstream liquid extraction branch (220), its first end is connected between the first medium channel (131) and the indoor heat exchanger (140), and its second end is connected between the first solenoid valve (340) and the first throttling device (320); and, the downstream liquid extraction branch (220) is provided with a second solenoid valve (350); A liquid discharge branch (230), its first end is connected to the upper part of the liquid storage tank (200), and its second end is connected to the second medium channel (132); and, the liquid discharge branch (230) is provided with a second throttling device (330).

2. The air conditioning system according to claim 1, Characterized in that, The liquid discharge branch (230) is provided with a fourth solenoid valve (370), and the fourth solenoid valve (370) is located between the liquid storage tank (200) and the second throttling device (330).

3. The air conditioning system according to claim 2, Characterized in that, It further comprises: A liquid storage four-way valve (240), including a first port (241), a second port (242), a third port (243) and a fourth port (244), wherein the first port (241) is connected to the upstream liquid extraction branch (210) through a third solenoid valve (360), and is located upstream of the first solenoid valve (340); the second port (242) is connected to the upstream liquid extraction branch (210), and is located downstream of the first throttling device (320); the third port (243) is connected to the liquid discharge branch (230), and is located between the fourth solenoid valve (370) and the second throttling device (330); the fourth port (244) is connected to the liquid discharge branch (230) through the first throttling device (320), and is located between the liquid storage tank (200) and the fourth solenoid valve (370).

4. The air conditioning system according to claim 3, Characterized in that, The air conditioning system includes a first mode, and the first mode corresponds to both the first solenoid valve (340) and the fourth solenoid valve (370) being opened, and both the second solenoid valve (350) and the third solenoid valve (360) being closed.

5. The air conditioning system according to claim 3, Characterized in that, The air conditioning system includes a second mode, and the second mode corresponds to both the second solenoid valve (350) and the fourth solenoid valve (370) being open, and both the first solenoid valve (340) and the third solenoid valve (360) being closed.

6. The air conditioning system according to claim 5, wherein, the air conditioning system includes a third mode, and the third mode corresponds to the third solenoid valve (360) being open, and the first solenoid valve (340), the second solenoid valve (350), and the fourth solenoid valve (370) all being closed.

7. The air conditioning system according to claim 6, wherein, in the third mode, when storing liquid, the first port (241) is in communication with the second port (242), and the third port (243) is in communication with the fourth port (244).

8. The air conditioning system according to claim 6, wherein, in the third mode, when discharging liquid, the first port (241) is in communication with the fourth port (244), and the second port (242) is in communication with the third port (243).

9. The air conditioning system according to claim 6, wherein, in the third mode, the second throttling device (330) is fully open.

10. The air conditioning system according to any one of claims 3 to 9, wherein, further comprising: a controller, electrically connected to the first solenoid valve (340), the second solenoid valve (350), the third solenoid valve (360), and the fourth solenoid valve (370), for controlling their on / off states.

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