Methods, apparatus, air conditioners and storage media for preventing liquid slugging in air conditioners

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a method for preventing liquid impact on an air conditioner. The method for preventing liquid impact on the air conditioner comprises the following steps: when the air conditioner is running a defrosting mode and the defrosting mode has not ended, the surface temperature T wo of an outdoor heat exchanger is acquired; when the surface temperature T wo is greater than or equal to a first preset temperature T w1 , and the duration is greater than or equal to a first preset duration t1, a first control valve is controlled to be opened, so that the refrigerant stored in a first liquid storage tank flows into a supercooling section passage. The method can reduce the amount of liquid refrigerant directly entering the compressor from the liquid storage tank when the defrosting is completed and the air conditioner is switched back to the heating mode, and can relieve the liquid impact phenomenon of the compressor. The application further discloses a device for preventing liquid impact on an air conditioner, an air conditioner and a storage medium.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, such as a method, device, and storage medium for preventing liquid slugging in an air conditioner. Background Technology

[0002] An air conditioner is an air conditioning unit that can operate in heating or cooling modes to regulate indoor temperature. Air conditioners have a refrigerant circulation loop, and the amount of refrigerant in this loop is the optimal amount required under rated operating conditions; this amount is fixed. Under non-rated operating conditions (such as low load), the amount of refrigerant in the circulation loop is not the optimal amount, and the air conditioner cannot perform at its best. Therefore, more and more air conditioners are equipped with a liquid receiver in their heat exchangers. This liquid receiver regulates the amount of refrigerant in the circulation loop, enabling the air conditioner to adjust the amount of refrigerant according to its operating conditions, thus improving performance. When the air conditioner is in heating mode, the outdoor heat exchanger often frosts up. To ensure the heating effect of the air source heat pump unit, once the outdoor heat exchanger reaches a certain level of frost, the unit will enter defrost mode.

[0003] The related technology provides a defrosting method in which the mode of the air conditioner is switched from heating mode to cooling mode when the outdoor heat exchanger is frosted, and the air conditioner is switched back to heating mode after defrosting is completed.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] When an air conditioner is in defrost mode, its load is low, and a certain amount of liquid refrigerant is stored in the receiver liner. In the defrost methods provided in related technologies, after defrosting is complete and the air conditioner switches back to heating mode, the liquid refrigerant in the receiver liner can easily enter the compressor directly, causing liquid slugging in the compressor. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a method, apparatus, air conditioner, and storage medium for preventing liquid slugging in an air conditioner. It can reduce the amount of liquid refrigerant that directly enters the compressor from the liquid receiver tank when defrosting is completed and the air conditioner switches back to heating mode, thereby alleviating the liquid slugging phenomenon in the compressor.

[0008] In some embodiments, the outdoor heat exchanger of the air conditioner includes: multiple heat exchange passages; a subcooling section passage connected to the multiple heat exchange passages; and a first liquid storage tank disposed between the multiple heat exchange passages for storing a portion of refrigerant when the air conditioner is in cooling mode and under low load. The first liquid storage tank is connected to the subcooling section passage via a first liquid pipe, and the first liquid pipe is provided with a first control valve. The method for preventing liquid slugging in the air conditioner includes: acquiring the surface temperature T of the outdoor heat exchanger while the air conditioner is operating in defrost mode and the defrost mode has not ended. wo When the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the first control valve is opened to allow the refrigerant stored in the first liquid tank to flow into the subcooling passage.

[0009] The method for preventing liquid slugging in an air conditioner provided in this embodiment obtains the surface temperature T of the outdoor heat exchanger while the air conditioner is running in defrost mode and the defrost mode has not ended. wo When the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to a first preset duration t1, the first control valve is opened, allowing the refrigerant stored in the first liquid receiver to flow into the subcooling passage. Thus, when defrosting is complete and the air conditioner switches back to heating mode, the amount of liquid refrigerant directly entering the compressor from the first liquid receiver can be effectively reduced, alleviating compressor liquid slugging.

[0010] Optionally, the method further includes: when the surface temperature T wo ≥ First preset temperature T w1 When the duration of the event is greater than or equal to the second preset duration t2, the first control valve is closed, the compressor of the air conditioner is turned off, and the reversing valve of the air conditioner is switched to a different direction, wherein the second preset duration t2 is greater than the first preset duration t1.

[0011] Optionally, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the second preset duration t2, control the first control valve to close, control the compressor of the air conditioner to stop, and control the reversing valve of the air conditioner to change direction, including: when the surface temperature T wo ≥ First preset temperature T w1 Duration greater than or equal to the first child's preset duration t 21 When the surface temperature T is reached, the first control valve is closed and the compressor is shut down; wo ≥ First preset temperature T w1The duration of the second sub-preset duration t is greater than or equal to the duration of the second sub-sub ... 22 At that time, the reversing valve is controlled to switch directions; where t1 < t 21 <t 22 .

[0012] Optionally, the outdoor heat exchanger further includes: a second liquid storage tank, disposed between the plurality of heat exchange passages and in a heat exchange passage different from the first liquid storage tank; the second liquid storage tank is connected to the first liquid storage tank via a second liquid pipe; the second liquid pipe is equipped with a second control valve; in the method for preventing liquid slugging in the air conditioner, when the surface temperature T... wo Greater than or equal to the first preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the method further includes: controlling the second control valve to open, so that the refrigerant stored in the second liquid storage tank flows into the first liquid storage tank.

[0013] Optionally, in the method for preventing liquid slugging in an air conditioner, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the second preset duration t2, the method further includes: controlling the second control valve to close.

[0014] Optionally, in the method for preventing liquid slugging in an air conditioner, when the surface temperature T wo ≥ First preset temperature T w1 The duration is greater than or equal to the first child's preset duration t 21 At the same time, it also includes: controlling the second control valve to close.

[0015] Optionally, the outdoor heat exchanger is provided with a first refrigerant inlet and a second refrigerant inlet and outlet. The outdoor heat exchanger further includes: a plurality of refrigerant pipes forming a first heat exchange passage, a second heat exchange passage, and a third heat exchange passage; a gas collecting pipe connected to the first refrigerant inlet and outlet and connected to a first end of the first heat exchange passage; a first diversion element connected to the gas collecting pipe via a first bypass pipe and connected to a first end of the third heat exchange passage; the first bypass pipe is provided with a first valve; a second diversion element connected to a second end of the second heat exchange passage; a third diversion element connected to a second end of the third heat exchange passage and connected to the second diversion element via a second bypass pipe, and connected to the second refrigerant inlet and outlet via a subcooling section passage; the second bypass pipe is provided with a second valve; wherein, the first liquid storage tank is also connected to the first end of the second heat exchange passage and the first diversion element; the second liquid storage tank is also connected to the second end of the first heat exchange passage and the second diversion element.

[0016] In some embodiments, the outdoor heat exchanger of the air conditioner includes: multiple heat exchange passages; a subcooling section passage connected to the multiple heat exchange passages; and a first liquid storage tank disposed between the multiple heat exchange passages for storing a portion of refrigerant when the air conditioner is in cooling mode and under low load. The first liquid storage tank is connected to the subcooling section passage via a first liquid pipe, and the first liquid pipe is provided with a first control valve. The device for preventing liquid slugging in the air conditioner includes: a detection module configured to detect the temperature T of the outdoor heat exchanger when the air conditioner is defrosting. wo The control module is configured to adjust the temperature T of the outdoor heat exchanger according to the temperature T. wo It controls the opening degree of the first control valve, the direction of the reversing valve, and the frequency of the compressor.

[0017] In some embodiments, the air conditioner includes a processor and a memory storing program instructions, the processor being configured to execute the above-described method for preventing liquid slugging in the air conditioner when executing the program instructions.

[0018] In some embodiments, the storage medium stores program instructions that, when executed, perform the above-described method for preventing liquid slugging in an air conditioner.

[0019] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0020] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0021] Figure 1 This is a schematic diagram of the structure of an outdoor heat exchanger for an air conditioner provided in an embodiment of this disclosure;

[0022] Figure 2 This is a schematic diagram of the structure of another outdoor heat exchanger for an air conditioner provided in an embodiment of this disclosure;

[0023] Figure 3 This is a schematic diagram of a method for preventing liquid slugging in an air conditioner, provided in an embodiment of this disclosure;

[0024] Figure 4 This is a schematic diagram of another method for preventing liquid slugging in an air conditioner provided in an embodiment of this disclosure;

[0025] Figure 5 This is a schematic diagram of another method for preventing liquid slugging in an air conditioner provided in an embodiment of this disclosure;

[0026] Figure 6This is a schematic diagram of another method for preventing liquid slugging in an air conditioner provided in an embodiment of this disclosure;

[0027] Figure 7 This is a schematic diagram of a device for preventing liquid slugging in an air conditioner, provided in an embodiment of this disclosure;

[0028] Figure 8 This is a schematic diagram of another device for preventing liquid slugging in an air conditioner, provided in an embodiment of this disclosure.

[0029] Figure label:

[0030] 1. Subcooling section passage; 2. First liquid storage tank; 3. Second liquid storage tank; 4. Gas collection pipe; 5. First flow divider element; 6. Second flow divider element; 7. Third flow divider element; 8. First heat exchange passage; 9. Second heat exchange passage; 10. Third heat exchange passage; 01. First refrigerant inlet / outlet; 02. Second refrigerant inlet / outlet; 101. First liquid pipe; 102. First control valve; 103. Second liquid pipe; 104. Second control valve; 105. First bypass pipe; 106. First valve; 107. Second bypass pipe; 108. Second valve. Detailed Implementation

[0031] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0032] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

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

[0034] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0035] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0036] This disclosure provides an air conditioner, which includes a refrigerant circulation loop, a compressor, an indoor heat exchanger, a throttling device, an outdoor heat exchanger, and a reversing valve.

[0037] The compressor, indoor heat exchanger, throttling device, and outdoor heat exchanger are sequentially arranged in the refrigerant circulation loop. By changing the direction of the reversing valve, the air conditioner can switch between heating and cooling modes.

[0038] Among them, see Figure 1 The outdoor heat exchanger of the air conditioner provided in this embodiment includes multiple heat exchange passages, a subcooling passage 1, and a first liquid storage tank 2.

[0039] The subcooling section passage 1 is connected to multiple heat exchange passages. The first liquid storage tank 2 is located between the multiple heat exchange passages and is used to store part of the refrigerant when the air conditioner is in cooling mode and the load is low. The first liquid storage tank 2 is connected to the subcooling section passage 1 through the first liquid pipe 101, and the first liquid pipe 101 is equipped with a first control valve 102.

[0040] The air conditioner provided in this embodiment can store refrigerant in the first liquid receiver 2 when the air conditioner is in cooling mode and the load is low. In this way, it can avoid the formation of a liquid film in the pipe section where the refrigerant has not been completely condensed, which would increase the heat exchange resistance and help improve the heat exchange effect of the outdoor heat exchanger and the performance of the air conditioner.

[0041] Optionally, see Figure 2 The outdoor heat exchanger also includes a second liquid storage tank 3. The second liquid storage tank 3 is located between multiple heat exchange passages and is located in a heat exchange passage different from the first liquid storage tank 2. The second liquid storage tank 3 and the first liquid storage tank 2 are connected through a second liquid pipe 103, and the second liquid pipe 103 is equipped with a second control valve 104.

[0042] This configuration improves the air conditioner's ability to regulate the amount of refrigerant circulating in the refrigerant circulation loop, thereby enhancing the air conditioner's performance.

[0043] Optionally, see Figure 2 The outdoor heat exchanger is equipped with a first refrigerant inlet / outlet 01 and a second refrigerant inlet / outlet 02. The outdoor heat exchanger also includes: multiple refrigerant pipes, a gas collection pipe 4, a first flow divider element 5, a second flow divider element 6 and a third flow divider element 7.

[0044] Multiple refrigerant pipes form a first heat exchange passage 8, a second heat exchange passage 9, and a third heat exchange passage 10. A gas collecting pipe 4 is connected to the first refrigerant inlet / outlet 01 and to the first end of the first heat exchange passage 8. A first diversion element 5 is connected to the gas collecting pipe 4 via a first bypass pipe 105 and to the first end of the third heat exchange passage 10. The first bypass pipe 105 is equipped with a first valve 106. A second diversion element 6 is connected to the second end of the second heat exchange passage 9. A third diversion element 7 is connected to the second end of the third heat exchange passage 10 and to the second diversion element 6 via a second bypass pipe 107, and to the second refrigerant inlet / outlet 02 via a subcooling section passage 1. The second bypass pipe 107 is equipped with a second valve 108. A first liquid storage tank 2 is also connected to the first end of the second heat exchange passage 9 and the first diversion element 5. A second liquid storage tank 3 is also connected to the second end of the first heat exchange passage 8 and the second diversion element 6.

[0045] When the air conditioner provided in this embodiment is operating in cooling mode and under low load, the first control valve 102, the first valve 106, and the second valve 108 are all closed, while the second control valve 104 is open or closed. Gaseous refrigerant enters the gas collection pipe 4 from the first refrigerant inlet / outlet 01, then enters the second liquid storage tank 3 after heat exchange through the first heat exchange passage 8. A first gas-liquid separation occurs in the second liquid storage tank 3. The separated liquid refrigerant either directly enters the first liquid storage tank 2 or is stored in the second liquid storage tank 3. The separated gaseous refrigerant enters the first liquid storage tank 2 after heat exchange through the second heat exchange passage 9. A second gas-liquid separation occurs in the first liquid storage tank 2. The separated gaseous refrigerant flows sequentially through the first diversion element 5, the third heat exchange passage 10, the third diversion element 7, and the subcooling section passage 1, finally exiting the outdoor heat exchanger from the second refrigerant inlet / outlet 02. The separated liquid refrigerant is stored in the first liquid storage tank 2. When the air conditioner is operating in cooling mode and under low load, some liquid refrigerant is stored in the first liquid receiver 2 or the second liquid receiver 3, reducing the amount of circulating refrigerant. This avoids the formation of a liquid film in the pipe sections where the refrigerant has not fully condensed, which would increase the heat exchange resistance and improve the heat exchange efficiency of the outdoor heat exchanger and the performance of the air conditioner.

[0046] It is understandable that when an air conditioner operates in cooling mode, it defrosts the outdoor heat exchanger, and the load on the air conditioner is relatively low during defrosting. In other words, the operating state of an air conditioner in defrosting mode is equivalent to the operating state of an air conditioner in cooling mode under low load conditions.

[0047] Optionally, the first valve 106 is a one-way valve, which allows refrigerant to flow from the first diversion element 5 to the gas collection pipe 4 and prevents refrigerant from flowing from the gas collection pipe 4 to the first diversion element 5.

[0048] Optionally, the second valve 108 is a one-way valve, which allows refrigerant to flow from the third diversion element 7 to the second diversion element 6 and prevents refrigerant from flowing from the second diversion element 6 to the third diversion element 7.

[0049] When the air conditioner provided in this embodiment operates the defrosting method provided in the related art, a certain amount of liquid refrigerant will be stored in the first liquid receiver 2 and / or the second liquid receiver 3. When defrosting is completed and the air conditioner switches back to heating mode, the liquid refrigerant stored in the first liquid receiver 2 directly enters the first diverter element 5, and then flows into the compressor, causing compressor liquid slugging. The liquid refrigerant stored in the second liquid receiver 3 will cause excessive liquid refrigerant to enter the first heat exchange passage 8, resulting in incomplete evaporation of the liquid refrigerant, thereby increasing the amount of refrigerant flowing to the compressor and exacerbating compressor liquid slugging.

[0050] Combination Figure 1 and Figure 2 The air conditioner shown in this disclosure provides a method for preventing liquid slugging in an air conditioner. See also... Figure 3 The method includes:

[0051] S301, when the air conditioner is in defrost mode and the defrost mode has not ended, obtain the surface temperature T of the outdoor heat exchanger. wo .

[0052] S302, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the first control valve 102 is opened, so that the refrigerant stored in the first liquid storage tank 2 flows into the subcooling passage 1.

[0053] The method for preventing liquid slugging in an air conditioner provided in this embodiment obtains the surface temperature T of the outdoor heat exchanger while the air conditioner is running in defrost mode and the defrost mode has not ended. wo When the surface temperature T wo Greater than or equal to the first preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the first control valve 102 is opened, allowing the refrigerant stored in the first liquid receiver 2 to flow into the subcooling passage 1. In this way, when defrosting is completed and the air conditioner switches back to heating mode, the amount of liquid refrigerant directly entering the compressor from the first liquid receiver 2 can be effectively reduced, alleviating compressor liquid slugging.

[0054] Optionally, the method for preventing liquid slugging in an air conditioner further includes: when the surface temperature T wo ≥ First preset temperature T w1When the duration of the event is greater than or equal to the second preset duration t2, the first control valve 102 is closed, the compressor of the air conditioner is turned off, and the reversing valve of the air conditioner is switched. Wherein, the second preset duration t2 > the first preset duration t1.

[0055] This configuration allows the air conditioner to complete defrosting and mitigates compressor liquid slugging when the air conditioner switches back to heating mode after defrosting. Specifically, when the surface temperature T... wo ≥ First preset temperature T w1 When the duration of defrosting is greater than or equal to the second preset duration t2, defrosting is completed, and the liquid refrigerant stored in the first liquid tank 2 is fully released. The first control valve 102 is closed, the compressor of the air conditioner is turned off, and the reversing valve of the air conditioner is switched to change direction so that the air conditioner switches back to heating mode.

[0056] Combination Figure 1 and Figure 2 The air conditioner shown in this disclosure provides another method for preventing liquid slugging in air conditioners. See also... Figure 4 The method includes:

[0057] S401, when the air conditioner is in defrost mode and the defrost mode has not ended, obtain the surface temperature T of the outdoor heat exchanger. wo .

[0058] S402, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the first control valve 102 is opened, so that the refrigerant stored in the first liquid storage tank 2 flows into the subcooling passage 1.

[0059] S403, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the second preset duration t2, the first control valve 102 is closed, the compressor of the air conditioner is turned off, and the reversing valve of the air conditioner is switched.

[0060] Among them, the second preset duration t2 is greater than the first preset duration t1.

[0061] The method for preventing liquid slugging in an air conditioner provided in this embodiment obtains the surface temperature T of the outdoor heat exchanger while the air conditioner is running in defrost mode and the defrost mode has not ended. wo When the surface temperature T wo Greater than or equal to the first preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the first control valve 102 is opened, allowing the refrigerant stored in the first liquid storage tank 2 to flow into the subcooling passage 1. When the surface temperature Two ≥ First preset temperature T w1 When the defrosting duration is greater than or equal to the second preset duration t2, defrosting is completed. This involves closing the first control valve 102, shutting off the air conditioner's compressor, and reversing the air conditioner's reversing valve, causing the air conditioner to switch back to heating mode. At this time, the liquid refrigerant stored in the first receiver 2 has been discharged, effectively reducing the amount of liquid refrigerant directly entering the compressor from the first receiver 2 and mitigating compressor liquid slugging.

[0062] Optionally, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the second preset duration t2, the first control valve 102 is closed, the compressor of the air conditioner is shut off, and the reversing valve of the air conditioner is switched (step S403), including:

[0063] S4031, when the surface temperature T wo ≥ First preset temperature T w1 The duration is greater than or equal to the first child's preset duration t 21 At that time, the first control valve 102 is closed and the compressor is shut down.

[0064] S4032, when the surface temperature T wo ≥ First preset temperature T w1 The duration of the second sub-preset duration t is greater than or equal to the duration of the second sub-sub ... 22 At that time, the control valve changes direction.

[0065] Where t1 < t 21 <t 22 .

[0066] When the surface temperature T wo ≥ First preset temperature T w1 The duration is greater than or equal to the first child's preset duration t 21 At this time, the liquid refrigerant stored in the first liquid storage tank 2 is discharged, the first control valve 102 is closed, and the compressor is shut down, preparing for the air conditioner to switch back to heating mode. When the surface temperature T wo ≥ First preset temperature T w1 The duration of the second sub-preset duration t is greater than or equal to the duration of the second sub-sub ... 22 When the control valve changes direction, the air conditioner switches back to heating mode.

[0067] Furthermore, the refrigerant flow is reversed when the air conditioner is in defrost mode and heating mode. This design, with step-by-step control of the first control valve 102 closing, the compressor shutting off, and the reversing valve switching direction, avoids the increased refrigerant flow resistance affecting heat exchange efficiency when the air conditioner immediately switches from defrost mode back to heating mode. Specifically, firstly, the first control valve 102 is closed and the compressor shuts off, causing the refrigerant flow rate to gradually slow down until it stops due to resistance. Then, the reversing valve is switched to heating mode, where refrigerant resistance is lower, allowing the air conditioner to provide rapid heating.

[0068] Optionally, the outdoor heat exchanger also includes a second liquid storage tank 3. The second liquid storage tank 3 is disposed among multiple heat exchange passages, and is located in a heat exchange passage different from the first liquid storage tank 2. The second liquid storage tank 3 is connected to the first liquid storage tank 2 via a second liquid pipe 103, and the second liquid pipe 103 is equipped with a second control valve 104. In the method for preventing liquid slugging in an air conditioner, when the surface temperature T... wo Greater than or equal to the first preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the method further includes: controlling the second control valve 104 to open, so that the refrigerant stored in the second liquid storage tank 3 flows into the first liquid storage tank 2.

[0069] When the air conditioner is operating in heating mode, the refrigerant flowing through the first heat exchange passage 8 is normally in a two-phase state of gas and liquid. When the air conditioner switches from defrost mode to heating mode, the second liquid receiver 3 may contain a large amount of liquid refrigerant. Excessive liquid refrigerant flowing through the first heat exchange passage 8 results in incomplete evaporation, with some flowing towards the compressor, causing compressor liquid slugging. Furthermore, if the air conditioner is operating under a heavy heating load, it takes a considerable amount of time for the liquid refrigerant stored in the second liquid receiver 3 to return to the system circulation, delaying the time it takes for the air conditioner to start blowing hot air again, leading to a poor user experience. This design allows the liquid refrigerant stored in the second liquid receiver 3 to flow out, preventing compressor liquid slugging. Additionally, the liquid refrigerant stored in the second liquid receiver 3 flows into the first liquid receiver 2, and further from the first liquid receiver 2 into the subcooling passage 1. This shortens the time it takes for the liquid refrigerant stored in the second liquid receiver 3 to return to the system circulation, reducing the time it takes for the air conditioner to start blowing hot air again and improving the user experience.

[0070] Combination Figure 1 and Figure 2 The air conditioner shown in this disclosure provides another method for preventing liquid slugging in air conditioners. See also... Figure 5 The method includes:

[0071] S501, when the air conditioner is in defrost mode and the defrost mode has not ended, obtain the surface temperature T of the outdoor heat exchanger. wo .

[0072] S502, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the second control valve 104 is opened to allow the refrigerant stored in the second liquid tank 3 to flow into the first liquid tank 2; the first control valve 102 is opened to allow the refrigerant stored in the first liquid tank 2 to flow into the subcooling passage 1.

[0073] Alternatively, in the method for preventing liquid slugging in an air conditioner, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the second preset duration t2, the method also includes: controlling the second control valve 104 to close. After the liquid refrigerant stored in the second liquid tank 3 has been released, the second control valve 104 is closed to prepare for the air conditioner to switch to heating mode.

[0074] Combination Figure 1 and Figure 2 The air conditioner shown in this disclosure provides another method for preventing liquid slugging in air conditioners. See also... Figure 6 The method includes:

[0075] S601, when the air conditioner is running in defrost mode and the defrost mode has not ended, obtain the surface temperature T of the outdoor heat exchanger. wo .

[0076] S602, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the second control valve 104 is opened to allow the refrigerant stored in the second liquid tank 3 to flow into the first liquid tank 2; the first control valve 102 is opened to allow the refrigerant stored in the first liquid tank 2 to flow into the subcooling passage 1.

[0077] S603, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the second preset duration t2, the first control valve 102 and the second control valve 104 are closed, the compressor of the air conditioner is turned off, and the reversing valve of the air conditioner is switched.

[0078] Among them, the second preset duration t2 is greater than the first preset duration t1.

[0079] Alternatively, in the method for preventing liquid slugging in an air conditioner, when the surface temperature T wo ≥ First preset temperature T w1 The duration is greater than or equal to the first child's preset duration t 21This also includes closing the second control valve 104. After the liquid refrigerant stored in the second liquid tank 3 has been released, the second control valve 104 is closed to prepare for the air conditioner to switch to heating mode.

[0080] Optionally, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the second preset duration t2, the first control valve 102 and the second control valve 104 are closed, the compressor of the air conditioner is shut off, and the reversing valve of the air conditioner is switched (step S603), including:

[0081] S6031, when the surface temperature T wo ≥ First preset temperature T w1 The duration is greater than or equal to the first child's preset duration t 21 At that time, the first control valve 102 and the second control valve 104 are closed, and the compressor is shut down.

[0082] S6032, when the surface temperature T wo ≥ First preset temperature T w1 The duration of the second sub-preset duration t is greater than or equal to the duration of the second sub-sub ... 22 At that time, the control valve changes direction.

[0083] Where t1 < t 21 <t 22 .

[0084] Combination Figure 1 and Figure 2 The air conditioner shown in this disclosure provides a device for preventing liquid slugging in the air conditioner. See also... Figure 7 The device includes an acquisition module 71 and a control module 72.

[0085] The acquisition module 71 is configured to acquire the surface temperature T of the outdoor heat exchanger when the air conditioner is running in defrost mode and the defrost mode has not ended. wo .

[0086] The control module 72 is configured to, when the surface temperature T wo ≥ First preset temperature T w1 When the duration is greater than or equal to the first preset duration t1, the first control valve is opened to allow the refrigerant stored in the first liquid tank to flow into the subcooling passage.

[0087] The device for preventing liquid slugging in an air conditioner provided in this embodiment acquires the surface temperature T of the outdoor heat exchanger when the air conditioner is running in defrost mode and the defrost mode has not ended. wo When the surface temperature T wo Greater than or equal to the first preset temperature Tw1 When the duration is greater than or equal to a first preset duration t1, the first control valve is opened, allowing the refrigerant stored in the first liquid receiver to flow into the subcooling passage. Thus, when defrosting is complete and the air conditioner switches back to heating mode, the amount of liquid refrigerant directly entering the compressor from the first liquid receiver can be effectively reduced, alleviating compressor liquid slugging.

[0088] Combination Figure 8 As shown, this disclosure provides an apparatus for preventing liquid slugging in an air conditioner, including a processor 800 and a memory 801. Optionally, the apparatus may further include a communication interface 802 and a bus 803. The processor 800, communication interface 802, and memory 801 can communicate with each other via the bus 803. The communication interface 802 can be used for information transmission. The processor 800 can call logical instructions in the memory 801 to execute the method for preventing liquid slugging in an air conditioner according to the above embodiment.

[0089] Furthermore, the logic instructions in the aforementioned memory 801 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0090] The memory 801, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 800 executes functional applications and data processing by running the program instructions / modules stored in the memory 801, thereby implementing the method for preventing liquid slugging in the air conditioner described in the above embodiments.

[0091] The memory 801 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 801 may include high-speed random access memory and may also include non-volatile memory.

[0092] This disclosure provides a computer-readable storage medium storing program instructions that, when executed, perform the above-described method for preventing liquid slugging in an air conditioner.

[0093] This disclosure provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the above-described method for preventing liquid slugging in an air conditioner.

[0094] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0095] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0096] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0097] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0098] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0099] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for preventing liquid striking of an air conditioner, characterized in that, the outdoor heat exchanger of the air conditioner comprises: a plurality of heat exchange passages; a supercooling passage in communication with the plurality of heat exchange passages; and a first liquid storage tank arranged between the plurality of heat exchange passages and used for storing part of refrigerant when the air conditioner is in a cooling mode and has a low load, the first liquid storage tank being in communication with the supercooling passage through a first liquid pipe, the first liquid pipe being provided with a first control valve; the method for preventing liquid striking of the air conditioner comprises: When the air conditioner is running in a defrosting mode and the defrosting mode is not ended, a surface temperature T of the outdoor heat exchanger is acquired wo ; when the surface temperature T wo ≥ a first preset temperature T w1 , and the duration is greater than or equal to a first preset duration t1, the first control valve is controlled to open, so that the refrigerant stored in the first liquid tank flows into the supercooling section passage.

2. The method of claim 1, wherein, the method further comprises: when the surface temperature T wo ≥ a first preset temperature T w1 when the duration of the surface temperature T is greater than or equal to a second preset duration t2, controlling the first control valve to close, controlling the compressor of the air conditioner to stop, and controlling the reversing valve of the air conditioner to switch direction, wherein the second preset time length t2 is greater than the first preset time length t1.

3. The method of claim 2, wherein, when the surface temperature T wo ≥ a first preset temperature T w1 for a duration greater than or equal to a second preset duration t2, controlling the first control valve to close, controlling the compressor of the air conditioner to stop, and controlling the reversing valve of the air conditioner to switch direction, comprising: when the surface temperature T wo ≥ a first preset temperature T w1 for a duration greater than or equal to a first sub preset duration t 21 , control the first control valve to close and control the compressor to stop; when the surface temperature T wo ≥ a first preset temperature T w1 for a duration greater than or equal to a second sub-preset duration t 22 , control the reversing valve to switch direction; wherein t1 < t 21 < t 22 .

4. The method according to any one of claims 1 to 3, characterized in that, the outdoor heat exchanger further comprises: a second liquid storage tank arranged between the plurality of heat exchange passages and arranged in a heat exchange passage different from the first liquid storage tank, the second liquid storage tank being in communication with the first liquid storage tank through a second liquid pipe, the second liquid pipe being provided with a second control valve, In the method for preventing liquid striking of the air conditioner, when the surface temperature T wo ≥ the first preset temperature T w1 , and the duration is greater than or equal to the first preset duration t1, further comprising: controlling the second control valve to open so that the refrigerant stored in the second liquid storage tank flows into the first liquid storage tank.

5. The method of claim 4, wherein, In the method for preventing liquid striking of the air conditioner, when the surface temperature T wo ≥ the first preset temperature T w1 is greater than or equal to the second preset duration t2, further comprising: controlling the second control valve to close.

6. The method of claim 5, wherein, In the method for preventing liquid striking of the air conditioner, when the surface temperature T wo ≥ the first preset temperature T w1 for a duration greater than or equal to the first sub preset duration t 21 , further comprising: controlling the second control valve to close.

7. The method of claim 6, wherein, the outdoor heat exchanger is provided with a first refrigerant inlet and a second refrigerant inlet, and further comprises: a plurality of refrigerant pipes forming a first heat exchange passage, a second heat exchange passage and a third heat exchange passage; a gas collecting pipe in communication with the first refrigerant inlet and in communication with a first end of the first heat exchange passage; a first flow dividing element in communication with the gas collecting pipe through a first bypass pipeline and in communication with a first end of the third heat exchange passage, the first bypass pipeline being provided with a first valve; a second flow dividing element in communication with a second end of the second heat exchange passage; a third flow dividing element in communication with a second end of the third heat exchange passage, in communication with the second flow dividing element through a second bypass pipeline, and in communication with the second refrigerant inlet through a supercooling passage, the second bypass pipeline being provided with a second valve; wherein the first liquid storage tank is further in communication with the first end of the second heat exchange passage and the first flow dividing element, and the second liquid storage tank is further in communication with a second end of the first heat exchange passage and the second flow dividing element.

8. An apparatus for preventing liquid striking of an air conditioner, characterized in that, the outdoor heat exchanger of the air conditioner comprises: a plurality of heat exchange passages; a supercooling passage in communication with the plurality of heat exchange passages; and a first liquid storage tank arranged between the plurality of heat exchange passages and used for storing part of refrigerant when the air conditioner is in a cooling mode and has a low load, the first liquid storage tank being in communication with the supercooling passage through a first liquid pipe, the first liquid pipe being provided with a first control valve; the apparatus for preventing liquid striking of the air conditioner comprises: The acquisition module is configured to acquire the surface temperature T of the outdoor heat exchanger when the air conditioner is running the defrosting mode and the defrosting mode has not ended wo ; a control module configured to control the first control valve to open when the surface temperature T wo ≥ a first preset temperature T w1 and the duration is greater than or equal to a first preset duration t1, so that the refrigerant stored in the first liquid tank flows into the supercooling section passage.

9. An air conditioner comprising a processor and a memory having stored therein program instructions, wherein, the processor is configured to execute the program instructions when executed, to perform the method for preventing liquid striking of the air conditioner according to any one of claims 1 to 7.

10. A storage medium storing program instructions, characterized in that, the program instructions, when executed, perform the method for preventing liquid striking of the air conditioner according to any one of claims 1 to 7.

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