Methods, devices, computer-readable storage media and air conditioners for preventing liquid slugging

Abstract

This application provides a method, apparatus, computer-readable storage medium, and air conditioner for preventing liquid slugging. The method includes: an acquisition step: when the indoor temperature of the indoor unit of the air conditioner reaches a predetermined temperature, acquiring the current running time, current outer ring temperature, current inner pipe temperature, and current outer pipe temperature; and a control step: when the current running time is greater than or equal to a first start-up time threshold, controlling the air conditioner to shut down for a predetermined time based on the current running time, current outer ring temperature, current inner pipe temperature, and current outer pipe temperature, and closing the expansion valve of the air conditioner after the predetermined time has elapsed. This prevents the situation where closing the expansion valve cannot avoid liquid slugging when the internal environment of the air conditioner is unbalanced, thereby solving the problem that due to a large system charge, refrigerant flows into the indoor unit during the pressure balancing process, and a large amount of refrigerant in the evaporator returns to the compressor upon restarting, causing compressor liquid slugging and damage.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and in particular to an anti-liquid-spraying method and device for an air conditioner, a computer readable storage medium and an air conditioner. BACKGROUND

[0002] For public places such as restaurants, shopping malls, hospitals, exhibition halls, large central air conditioning duct units are often used. For large central air conditioning duct units, the indoor and outdoor units are generally installed far apart or have a large height difference, and a long connecting pipe is needed for the transmission of refrigerant. At the same time, in order to meet the performance of the unit and the comfort of the room, the refrigerant filling amount needs to be increased. The refrigerant filling amount will be much larger than the normal refrigerant amount and will exceed the maximum allowable filling amount of the air conditioner compressor, so an external vapor-liquid separator is added to the air conditioning system to prevent too much liquid refrigerant from returning to the compressor and causing liquid hammer.

[0003] However, when the air conditioner is frequently started and stopped at low load, the liquid refrigerant in the vapor-liquid separator increases, which can easily cause liquid return and even compressor liquid hammer, resulting in compressor damage. That is, the air conditioner can easily cause the refrigerant to flow into the indoor unit during the pressure balance process due to the large system filling amount, and when the unit is started again, a large amount of refrigerant in the evaporator returns to the compressor, causing compressor liquid hammer and resulting in compressor damage. SUMMARY

[0004] The main purpose of the present application is to provide an anti-liquid-spraying method and device for an air conditioner, a computer readable storage medium and an air conditioner, to at least solve the problem of compressor damage caused by the refrigerant flowing into the indoor unit during the pressure balance process due to the large system filling amount, and when the unit is started again, a large amount of refrigerant in the evaporator returns to the compressor, causing compressor liquid hammer and resulting in compressor damage.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, an anti-liquid-spraying method for an air conditioner is provided, which comprises: a step of obtaining: obtaining the running time of the air conditioner at the current time, the temperature of the outdoor environment where the outdoor unit of the air conditioner is located at the current time, the temperature of the indoor unit at the current time and the temperature of the outdoor unit at the current time, to obtain the current running time, the current outdoor ring temperature, the current inner pipe temperature and the current outer pipe temperature, under the condition that the temperature of the indoor environment where the indoor unit of the air conditioner is located reaches a predetermined temperature; a control step: under the condition that the current running time is greater than or equal to a first start-up time threshold, according to the current running time, the current outdoor ring temperature, the current inner pipe temperature and the current outer pipe temperature, the air conditioner is controlled to stop for a predetermined time, and the expansion valve of the air conditioner is closed after the predetermined time, wherein the expansion valve is used to communicate the indoor unit and the outdoor unit.

[0006] Optionally, in the case that the current running time is greater than or equal to a first startup time threshold, the air conditioner is controlled to stop for a predetermined time according to the current running time, the current outer ring temperature, the current inner tube temperature and the current outer tube temperature, and the expansion valve of the air conditioner is closed after the predetermined time, comprising: in the case that the current running time is greater than or equal to a first startup time threshold, a target liquid impact risk level is determined according to the current running time, the target liquid impact risk level being one of a first liquid impact risk level, a second liquid impact risk level and a third liquid impact risk level in which the risk degree is sequentially increased, wherein the smaller the current running time is, the higher the risk degree represented by the target liquid impact risk level corresponding to the current running time is; the air conditioner is controlled to stop for the predetermined time according to the target liquid impact risk level, the current outer ring temperature, the current inner tube temperature and the current outer tube temperature, and the expansion valve is closed after the predetermined time.

[0007] Optionally, the air conditioner is controlled to stop for the predetermined time according to the target liquid impact risk level, the current outer ring temperature, the current inner tube temperature and the current outer tube temperature, and the expansion valve is closed after the predetermined time, comprising: in the case that the target liquid impact risk level is the first liquid impact risk level, and the current outer ring temperature is greater than a first outer ring temperature threshold, and the difference between the current inner tube temperature and the current outer tube temperature is greater than a first temperature difference threshold, the air conditioner is controlled to stop for the predetermined time, and the expansion valve is closed after the predetermined time; in the case that the target liquid impact risk level is the second liquid impact risk level, and the current outer ring temperature is greater than a second outer ring temperature threshold, and the difference between the current inner tube temperature and the current outer tube temperature is greater than a second temperature difference threshold, the second outer ring temperature threshold being less than the first outer ring temperature threshold, and the second temperature difference threshold being less than the first temperature difference threshold, the air conditioner is controlled to stop for the predetermined time, and the expansion valve is closed after the predetermined time; in the case that the target liquid impact risk level is the third liquid impact risk level, and the current outer ring temperature is greater than a third outer ring temperature threshold, and the difference between the current inner tube temperature and the current outer tube temperature is greater than a third temperature difference threshold, the third outer ring temperature threshold being less than the second outer ring temperature threshold, and the third temperature difference threshold being less than the second temperature difference threshold, the air conditioner is controlled to stop for the predetermined time, and the expansion valve is closed after the predetermined time.

[0008] Optionally, after the air conditioner is controlled to be stopped for the predetermined time according to the target liquid strike risk level, the current outer ring temperature, the current inner tube temperature and the current outer tube temperature, and the expansion valve is closed after the predetermined time is elapsed, the method further comprises: in the case that the target liquid strike risk level is the second liquid strike risk level or the third liquid strike risk level, determining that the rotation speed adjustment step of the fan of the outdoor unit is a speed-down preset value after each time the fan of the outdoor unit is turned on subsequently until the rotation speed of the fan of the outdoor unit is a minimum rotation speed threshold.

[0009] Optionally, after the air conditioner is controlled to be stopped for the predetermined time according to the target liquid strike risk level, the current outer ring temperature, the current inner tube temperature and the current outer tube temperature, and the expansion valve is closed after the predetermined time is elapsed, the method further comprises: obtaining the stop time of the outdoor unit at the current time; in the case that the air conditioner is started again, the target liquid strike risk level is the second liquid strike risk level, and the stop time is less than a first stop time threshold, determining that the temperature adjustment step of the air conditioner is a first preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently; in the case that the air conditioner is started again, the target liquid strike risk level is the third liquid strike risk level, and the stop time is greater than or equal to the first stop time threshold, determining that the temperature adjustment step of the air conditioner is the first preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently; in the case that the air conditioner is started again, the target liquid strike risk level is the third liquid strike risk level, and the stop time is less than the first stop time threshold, determining that the temperature adjustment step of the air conditioner is a second preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently, the second preset adjustment value being greater than the first preset adjustment value.

[0010] Optionally, after the temperature adjustment step of the air conditioner is determined to be the first preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently, or the temperature adjustment step of the air conditioner is determined to be the second preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently, the method further comprises: repeatedly performing the obtaining step and the controlling step; in the case that the target liquid strike risk level is the third liquid strike risk level, and the running time of the air conditioner is greater than or equal to a second start time threshold, controlling the air conditioner to be stopped again, the second start time threshold being greater than the first start time threshold; in the case that the target liquid strike risk level is the third liquid strike risk level, and the stop time of the outdoor unit is greater than or equal to a second stop time threshold, controlling the outdoor unit to be started again, the second stop time threshold being greater than the first stop time threshold.

[0011] Optionally, determining the target liquid slugging risk level based on the current operating time includes: determining the target liquid slugging risk level as the first liquid slugging risk level when the current operating time is greater than a second power-on time threshold; determining the target liquid slugging risk level as the second liquid slugging risk level when the current operating time is less than or equal to the second power-on time threshold and the current operating time is greater than the first power-on time threshold, wherein the second power-on time threshold is greater than the first power-on time threshold; and determining the target liquid slugging risk level as the third liquid slugging risk level when the current operating time is equal to the first power-on time threshold.

[0012] According to another aspect of this application, an anti-liquid-slugging device for an air conditioner is provided, the device comprising:

[0013] The acquisition unit is used to perform the acquisition step: when the temperature of the indoor environment where the indoor unit of the air conditioner is located reaches the predetermined temperature, the air conditioner's running time at the current moment, the outdoor environment temperature where the outdoor unit of the air conditioner is located at the current moment, the indoor unit's temperature at the current moment, and the outdoor unit's temperature at the current moment are acquired to obtain the current running time, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature.

[0014] The control unit is used to execute the following control steps: when the current running time is greater than or equal to a first start-up time threshold, the control unit controls the air conditioner to stop for a predetermined time based on the current running time, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature, and closes the expansion valve of the air conditioner after the predetermined time has elapsed, wherein the expansion valve is used to connect the indoor unit and the outdoor unit.

[0015] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the described air conditioning anti-liquid-smash methods.

[0016] According to another aspect of this application, an air conditioner is provided, comprising: an outdoor unit, an indoor unit, an expansion valve, and a controller, wherein the outdoor unit and the indoor unit are connected via the expansion valve, and the outdoor unit, the indoor unit, and the expansion valve communicate with the controller, the controller being used to execute any of the liquid-slugging prevention methods of the air conditioner.

[0017] By applying the technical solution of this application, when the outdoor temperature is higher and the indoor temperature is lower, and the condenser temperature is higher than the evaporator temperature, refrigerant is more likely to migrate to the evaporator. Therefore, based on the current running time, current outer ring temperature, current inner pipe temperature, and the current outer pipe temperature, it is possible to accurately determine whether liquid slugging is likely to occur under the current conditions. Thus, the air conditioner is turned off first, and the expansion valve is closed only after the internal environment of the air conditioner has reached equilibrium. This prevents the situation where closing the expansion valve cannot avoid liquid slugging when the internal environment of the air conditioner is unbalanced. In this way, the problem of refrigerant flowing into the indoor unit during the pressure balancing process due to the large system charge of the air conditioner, and then causing a large amount of refrigerant in the evaporator to return to the compressor when restarted, resulting in compressor liquid slugging and damage to the compressor, is solved. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 A schematic flowchart of an air conditioner anti-liquid slugging method according to an embodiment of this application is shown;

[0020] Figure 2 A flowchart illustrating another method for preventing liquid slugging in air conditioners is shown.

[0021] Figure 3 A structural block diagram of an anti-liquid-slugging device for an air conditioner according to an embodiment of this application is shown;

[0022] Figure 4 A schematic diagram of an air conditioner is shown.

[0023] The above figures include the following reference numerals:

[0024] 100. Outdoor unit; 110. Compressor; 111. Liquid receiver; 120. First evaporator; 130. Outdoor fan; 140. Gas-liquid separator; 150. Four-way valve; 200. Indoor unit; 210. Second evaporator; 220. Indoor fan; 300. Expansion valve. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] As described in the background section, frequent start-stop cycles of low-load air conditioners increase the amount of liquid refrigerant in the vapor-liquid separator, easily leading to liquid return and even compressor liquid slugging, causing compressor damage. Specifically, due to a large system charge, refrigerant can flow into the indoor unit during pressure equalization, and upon restarting, a large amount of refrigerant in the evaporator returns to the compressor, causing compressor liquid slugging and damage. To address this problem, embodiments of this application provide a method, apparatus, computer-readable storage medium, and air conditioner for preventing liquid slugging.

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] The embodiments of this application provide a method for preventing liquid slugging in an air conditioner. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0031] Figure 1 This is a schematic flowchart illustrating a liquid-slugging prevention method for an air conditioner according to an embodiment of this application. Figure 1 As shown, the method includes the following steps:

[0032] Step S101, Acquisition Step: When the indoor temperature of the indoor unit of the air conditioner reaches the predetermined temperature, acquire the running time of the air conditioner at the current moment, the outdoor temperature of the outdoor unit of the air conditioner at the current moment, the temperature of the indoor unit at the current moment, and the temperature of the outdoor unit at the current moment, to obtain the current running time, current outer ring temperature, current inner pipe temperature, and current outer pipe temperature.

[0033] Specifically, the higher the outdoor temperature and the lower the indoor temperature, the more likely refrigerant will migrate to the evaporator when the condenser temperature is higher than the evaporator temperature. Therefore, by combining the operating time with the outdoor temperature and the temperature difference between the indoor and outdoor pipes, the severity of refrigerant migration can be judged. This allows for the control of the expansion valve's opening and closing and the adjustment of temperature control precision to reduce the risk of liquid slugging during startup, thereby increasing the success rate of preventing liquid slugging.

[0034] Under normal circumstances, the air conditioner operates for a minimum of 7 minutes, and the compressor is only allowed to restart after at least 3 minutes of shutdown. The air conditioner's control precision is ±A (preset value is 1℃), meaning in cooling mode: when the difference between the indoor temperature setpoint and the indoor temperature is greater than or equal to 1℃, the air conditioner stops when it reaches the desired temperature. If the difference between the indoor temperature setpoint and the indoor temperature is greater than or equal to 1℃, the air conditioner is allowed to restart (when the compressor has been off for 3 minutes). During shutdown, the electronic expansion valve is open at B (B = 250P).

[0035] Step S102, control steps: when the current running time is greater than or equal to the first start-up time threshold, the air conditioner is controlled to shut down for a predetermined time based on the current running time, the current outer ring temperature, the current inner pipe temperature and the current outer pipe temperature, and the air conditioner's expansion valve is closed after the predetermined time has elapsed, wherein the expansion valve is used to connect the indoor unit and the outdoor unit.

[0036] Specifically, if the current running time is greater than or equal to the first start-up time threshold, it indicates a risk of liquid slugging. Therefore, the severity of refrigerant migration should be judged by considering the running time in combination with the outdoor temperature and the temperature difference between the indoor and outdoor pipes. Liquid slugging can be prevented by controlling the air conditioner's scheduled shutdown time and closing the air conditioner's expansion valve after the scheduled time has elapsed.

[0037] In the above embodiments, when the outdoor temperature is higher and the indoor temperature is lower, and the condenser temperature is higher than the evaporator temperature, refrigerant is more likely to migrate to the evaporator. Therefore, based on the current running time, current outer ring temperature, current inner pipe temperature, and the aforementioned current outer pipe temperature, it is possible to accurately determine whether liquid slugging is likely to occur under the current conditions. Thus, the air conditioner is turned off first, and the expansion valve is closed only after the internal environment of the air conditioner has reached equilibrium. This prevents the situation where closing the expansion valve cannot avoid liquid slugging when the internal environment of the air conditioner is unbalanced. In this way, the problem of refrigerant flowing into the indoor unit during the pressure balancing process due to the large system charge of the air conditioner, and then returning a large amount of refrigerant in the evaporator to the compressor when restarted, causing compressor liquid slugging and damage to the compressor, is solved.

[0038] Step S102, which involves controlling the air conditioner to shut down for a predetermined time based on the current running time, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature when the current running time is greater than or equal to the first start-up time threshold, and closing the air conditioner's expansion valve after the predetermined time has elapsed, includes:

[0039] If the current running time is greater than or equal to the first power-on time threshold, the target liquid shock risk level is determined based on the current running time. The target liquid shock risk level is one of the first liquid shock risk level, the second liquid shock risk level, and the third liquid shock risk level, which are progressively higher in risk. The smaller the current running time, the higher the risk level represented by the target liquid shock risk level corresponding to the current running time.

[0040] Specifically, if the current running time is greater than or equal to the first power-on time threshold, it indicates a risk of liquid slugging. At the same time, the shorter the current running time, the higher the risk level represented by the target liquid slugging risk level corresponding to the current running time, because the shorter the running time, the more liquid droplets accumulate, which leads to a higher probability of liquid slugging.

[0041] In one embodiment of this application, determining the target liquid slugging risk level based on the current running time includes:

[0042] If the current running time is greater than the second startup time threshold, the target liquid slugging risk level is determined to be the first liquid slugging risk level.

[0043] Specifically, the shorter the current running time, the higher the risk level represented by the target liquid slamming risk level corresponding to the current running time. When the current running time is greater than the second start-up time threshold, the liquid slamming risk is determined to be low, and thus the target liquid slamming risk level is determined to be the first liquid slamming risk level.

[0044] If the current running time is less than or equal to the second power-on time threshold and the current running time is greater than the first power-on time threshold, the target liquid shock risk level is determined to be the second liquid shock risk level, and the second power-on time threshold is greater than the first power-on time threshold.

[0045] Specifically, if the current running time is less than or equal to the second power-on time threshold and the current running time is greater than the first power-on time threshold, it indicates that the liquid slamming risk is moderate, and thus the target liquid slamming risk level is determined to be the second liquid slamming risk level.

[0046] If the current running time is equal to the first startup time threshold, the target liquid slugging risk level is determined to be the third liquid slugging risk level.

[0047] Specifically, if the current running time is equal to the first startup time threshold, it indicates a high risk of liquid slugging, and thus the target liquid slugging risk level is determined to be the third liquid slugging risk level.

[0048] Based on the aforementioned target liquid slugging risk level, the aforementioned current outer ring temperature, the aforementioned current inner pipe temperature, and the aforementioned current outer pipe temperature, the aforementioned air conditioner is controlled to shut down for the aforementioned predetermined time, and the aforementioned expansion valve is closed after the aforementioned predetermined time has elapsed.

[0049] Specifically, based on the aforementioned target liquid slugging risk level, the aforementioned current outer ring temperature, the aforementioned current inner pipe temperature, and the aforementioned current outer pipe temperature, controlling the aforementioned air conditioner to shut down for the aforementioned predetermined time, and closing the aforementioned expansion valve after the aforementioned predetermined time has elapsed, includes:

[0050] When the target liquid slugging risk level is the first liquid slugging risk level, and the current outer ring temperature is greater than the first outer ring temperature threshold, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than the first temperature difference threshold, the air conditioner is controlled to stop for the predetermined time, and the expansion valve is closed after the predetermined time has elapsed.

[0051] Specifically, the predetermined time is 5 seconds, the first outer ring temperature threshold is 40°C, and the first temperature difference threshold is 15°C. If the target liquid slugging risk level is the first liquid slugging risk level, and the current outer ring temperature is greater than 40°C, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than 15°C, it indicates a high risk of liquid slugging. Therefore, the air conditioner needs to be shut down for 5 seconds, that is, the internal environment of the air conditioner should be balanced first, and the expansion valve should be closed after 5 seconds.

[0052] When the target liquid slugging risk level is the second liquid slugging risk level, and the current outer ring temperature is greater than the second outer ring temperature threshold, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than the second temperature difference threshold, the air conditioner is controlled to stop for the predetermined time, and the expansion valve is closed after the predetermined time has elapsed. The second outer ring temperature threshold is less than the first outer ring temperature threshold, and the second temperature difference threshold is less than the first temperature difference threshold.

[0053] Specifically, the second outer ring temperature threshold is 35℃, and the second temperature difference threshold is 10℃. When the target liquid slugging risk level is the second liquid slugging risk level, and the current outer ring temperature is greater than 35℃, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than 10℃, it indicates a high risk of liquid slugging. Therefore, the air conditioner needs to be shut down for 5 seconds, that is, the internal environment of the air conditioner should be balanced first, and the expansion valve should be closed after 5 seconds.

[0054] When the target liquid slugging risk level is the third liquid slugging risk level, and the current outer ring temperature is greater than the third outer ring temperature threshold, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than the third temperature difference threshold, the air conditioner is controlled to stop for the predetermined time, and the expansion valve is closed after the predetermined time has elapsed. The third outer ring temperature threshold is less than the second outer ring temperature threshold, and the third temperature difference threshold is less than the second temperature difference threshold.

[0055] Specifically, the third outer ring temperature threshold is 30℃, the first temperature difference threshold is 5℃. When the target liquid slugging risk level is the third liquid slugging risk level, and the current outer ring temperature is greater than 30℃, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than 5℃, it indicates a high risk of liquid slugging. Therefore, the air conditioner needs to be shut down for 5 seconds, that is, the internal environment of the air conditioner should be balanced first, and the expansion valve should be closed after 5 seconds.

[0056] In one embodiment of this application, after controlling the air conditioner to shut down for a predetermined time based on the target liquid slugging risk level, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature, and closing the expansion valve after the predetermined time has elapsed, the method further includes:

[0057] If the target liquid slugging risk level is the second liquid slugging risk level or the third liquid slugging risk level, it is determined that each time the fan of the outdoor unit is turned on, the speed adjustment step of the fan of the outdoor unit is a speed reduction preset value until the speed of the fan of the outdoor unit is the minimum wind speed threshold.

[0058] Specifically, the second and third liquid slugging risk levels represent a greater degree of liquid slugging risk than the first liquid slugging risk level. Therefore, each time the outdoor unit's fan is turned on, the speed should be reduced. That is, the speed adjustment step of the outdoor unit's fan should be set to a preset speed reduction value each time the outdoor unit's fan is turned on, in order to prevent a large number of liquid droplets from being blown away and thus prevent liquid slugging. At the same time, a minimum value should be set to ensure the normal operation of the fan. Therefore, if the speed of the outdoor unit's fan is at the minimum wind speed threshold, there is no need to further reduce the speed.

[0059] In one embodiment of this application, after controlling the air conditioner to shut down for a predetermined time based on the target liquid slugging risk level, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature, and closing the expansion valve after the predetermined time has elapsed, the method further includes:

[0060] Obtain the current downtime of the aforementioned outdoor unit;

[0061] If the air conditioner is restarted and the target liquid slugging risk level is the second liquid slugging risk level, and the downtime is less than the first downtime threshold, then the temperature adjustment step size of the air conditioner is determined to be the first preset adjustment value each time the temperature of the air conditioner is adjusted.

[0062] Specifically, in order to prevent the outdoor refrigerant from migrating to the evaporator due to system balance and increasing the risk of liquid slugging, when the air conditioner is restarted, and the target liquid slugging risk level is the second liquid slugging risk level, and the downtime is less than the first downtime threshold, it is determined that the temperature adjustment step of the air conditioner is a first preset adjustment value each time the temperature of the air conditioner is adjusted. The first preset adjustment value is 1°C more than the initial setting value of the adjustment value, thereby preventing the outdoor refrigerant from migrating to the evaporator due to system balance and increasing the risk of liquid slugging.

[0063] If the air conditioner is restarted and the target liquid slugging risk level is the third liquid slugging risk level, and the downtime is greater than or equal to the first downtime threshold, then the temperature adjustment step size of the air conditioner is determined to be the first preset adjustment value each time the temperature of the air conditioner is adjusted.

[0064] Specifically, when the target liquid slugging risk level is the third liquid slugging risk level mentioned above, it is necessary to consider whether the downtime is greater than or equal to the first downtime threshold mentioned above. If the downtime is greater than or equal to the first downtime threshold mentioned above, it is determined that the temperature adjustment step size of the air conditioner will be the first preset adjustment value each time the temperature is adjusted thereafter. This is to prevent the outdoor refrigerant from migrating to the evaporator due to system balance, thus increasing the risk of liquid slugging.

[0065] If the air conditioner is restarted and the target liquid slugging risk level is the third liquid slugging risk level, and the downtime is less than the first downtime threshold, then it is determined that each time the temperature of the air conditioner is adjusted subsequently, the temperature adjustment step size of the air conditioner is the second preset adjustment value, which is greater than the first preset adjustment value.

[0066] Specifically, because the third liquid slugging risk level represents a higher degree of liquid slugging risk than the second liquid slugging risk level, the temperature regulation accuracy needs to be greater than that under the second liquid slugging risk level in order to prevent the outdoor refrigerant from migrating to the evaporator due to system balance and increasing the risk of liquid slugging. Therefore, a second preset regulation value larger than the first preset regulation value needs to be set as the temperature regulation step size of the air conditioner. The second preset regulation value is 2°C more than the initial setting value of the regulation value.

[0067] In one embodiment of this application, after determining the temperature adjustment step size of the air conditioner to be the first preset adjustment value each time the temperature of the air conditioner is subsequently adjusted, or after determining the temperature adjustment step size of the air conditioner to be the second preset adjustment value each time the temperature of the air conditioner is subsequently adjusted, the method further includes:

[0068] Repeat the above acquisition steps and the above control steps;

[0069] If the target liquid slugging risk level is the third liquid slugging risk level, and the air conditioner's operating time is greater than or equal to the second start-up time threshold, then the air conditioner will be shut down. The second start-up time threshold is greater than the first start-up time threshold.

[0070] Specifically, after completing the above acquisition and control steps, it is necessary to determine whether the liquid slugging risk level has decreased at the current moment. Therefore, it is necessary to re-determine the liquid slugging risk level. If the target liquid slugging risk level is the third liquid slugging risk level mentioned above, it means that the liquid slugging situation has not been improved. Before controlling the air conditioner to shut down, it is necessary to first confirm whether the above-mentioned running time of the air conditioner is greater than or equal to the second start-up time threshold. If the above-mentioned running time of the air conditioner is greater than or equal to the second start-up time threshold, then the air conditioner is controlled to shut down, thereby reducing the number of frequent start-ups and shutdowns of the air conditioner and improving the reliability of air conditioner operation.

[0071] If the target liquid slugging risk level is the third liquid slugging risk level, and the downtime of the outdoor unit is greater than or equal to the second downtime threshold, then the outdoor unit is turned on again, and the second downtime threshold is greater than the first downtime threshold.

[0072] Specifically, similarly, if the downtime of the outdoor unit is greater than or equal to the second downtime threshold, the outdoor unit will be turned on again, thereby reducing the number of times the air conditioner is frequently turned on and off and improving the reliability of the air conditioner operation.

[0073] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the anti-liquid-smashing method for air conditioners of this application will be described in detail below with reference to specific embodiments.

[0074] This embodiment relates to a specific method for preventing liquid slugging in an air conditioner, such as... Figure 2 As shown, it includes the following steps:

[0075] Step S1: When the indoor temperature of the air conditioner's indoor unit reaches the predetermined temperature, obtain the air conditioner's running time at the current moment, the outdoor temperature of the air conditioner's outdoor unit at the current moment, the indoor temperature at the current moment, and the outdoor temperature at the current moment to obtain the current running time, current outer ring temperature, current inner pipe temperature, and current outer pipe temperature.

[0076] Step S2: When the current running time is greater than or equal to the first power-on time threshold, the target liquid shock risk level is determined based on the current running time. The target liquid shock risk level is one of the first liquid shock risk level, the second liquid shock risk level, and the third liquid shock risk level, which are progressively higher in risk. The smaller the current running time, the higher the risk level represented by the target liquid shock risk level corresponding to the current running time.

[0077] If the current running time is greater than the second startup time threshold, the target liquid slugging risk level is determined to be the first liquid slugging risk level; if the current running time is less than or equal to the second startup time threshold and greater than the first startup time threshold, the target liquid slugging risk level is determined to be the second liquid slugging risk level, where the second startup time threshold is greater than the first startup time threshold; if the current running time is equal to the first startup time threshold, the target liquid slugging risk level is determined to be the third liquid slugging risk level.

[0078] Step S3: If the target liquid slugging risk level is the first liquid slugging risk level, and the current outer ring temperature is greater than 40°C, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than 15°C, it indicates a high risk of liquid slugging. The air conditioner needs to be shut down for 5 seconds to allow the internal environment of the air conditioner to balance, and then the expansion valve is closed after 5 seconds. If the target liquid slugging risk level is the second liquid slugging risk level, and the current outer ring temperature is greater than 35°C, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than 15°C, it indicates a high risk of liquid slugging. If the temperature difference is greater than 10°C, it indicates a high risk of liquid slugging, and the air conditioner needs to be shut down for 5 seconds to allow the internal environment of the air conditioner to balance before closing the expansion valve. If the target liquid slugging risk level is the third liquid slugging risk level, the current outer ring temperature is greater than 30°C, and the temperature difference between the current inner pipe temperature and the current outer pipe temperature is greater than 5°C, it indicates a high risk of liquid slugging, and the air conditioner needs to be shut down for 5 seconds to allow the internal environment of the air conditioner to balance before closing the expansion valve.

[0079] Step S4: If the target liquid slugging risk level is the second liquid slugging risk level or the third liquid slugging risk level, determine that each time the fan of the outdoor unit is turned on, the speed adjustment step of the fan of the outdoor unit is the speed reduction preset value until the speed of the fan of the outdoor unit is the minimum wind speed threshold.

[0080] Step S5: Redetermine the target liquid slugging risk level. If the target liquid slugging risk level is the third liquid slugging risk level and the air conditioner's operating time is greater than or equal to the second start-up time threshold, then control the air conditioner to shut down. The second start-up time threshold is greater than the first start-up time threshold. If the target liquid slugging risk level is the third liquid slugging risk level and the outdoor unit's shutdown time is greater than or equal to the second shutdown time threshold, then control the outdoor unit to start up. The second shutdown time threshold is greater than the first shutdown time threshold.

[0081] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0082] This application also provides an anti-liquid-smash device for an air conditioner. It should be noted that the anti-liquid-smash device for an air conditioner in this application can be used to execute the anti-liquid-smash method for an air conditioner provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0083] The following describes the anti-liquid-smashing device for air conditioners provided in the embodiments of this application.

[0084] Figure 3 This is a structural block diagram of an anti-liquid-slugging device for an air conditioner provided according to an embodiment of this application. Figure 3 As shown, the device includes:

[0085] The acquisition unit 31 is used to perform the acquisition step: when the temperature of the indoor environment where the indoor unit of the air conditioner is located reaches the predetermined temperature, the air conditioner's running time at the current moment, the outdoor environment where the outdoor unit of the air conditioner is located at the current moment, the indoor unit's temperature at the current moment, and the outdoor unit's temperature at the current moment are acquired to obtain the current running time, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature.

[0086] Control unit 32 is used to perform the following control steps: when the current running time is greater than or equal to the first start-up time threshold, control the air conditioner to shut down for a predetermined time based on the current running time, the current outer ring temperature, the current inner pipe temperature and the current outer pipe temperature, and close the expansion valve of the air conditioner after the predetermined time has elapsed, wherein the expansion valve is used to connect the indoor unit and the outdoor unit.

[0087] In the aforementioned device, when the outdoor temperature is higher and the indoor temperature is lower, and the condenser temperature is higher than the evaporator temperature, refrigerant is more likely to migrate to the evaporator. Therefore, based on the current running time, current outer ring temperature, current inner pipe temperature, and the aforementioned current outer pipe temperature, it is possible to accurately determine whether liquid slugging is likely to occur under the current conditions. Thus, the air conditioner is turned off first, and the expansion valve is closed only after the internal environment of the air conditioner has reached equilibrium. This prevents the situation where closing the expansion valve cannot avoid liquid slugging when the internal environment of the air conditioner is unbalanced. In this way, the problem of refrigerant flowing into the indoor unit during the pressure balancing process due to the large system charge of the air conditioner, and then causing a large amount of refrigerant in the evaporator to return to the compressor when restarted, resulting in compressor liquid slugging and damage to the compressor, is solved.

[0088] In one embodiment of this application, the control unit includes a first determining module and a first controlling module. The first determining module is used to determine a target liquid slugging risk level based on the current operating time when the current operating time is greater than or equal to a first start-up time threshold. The target liquid slugging risk level is one of a first liquid slugging risk level, a second liquid slugging risk level, and a third liquid slugging risk level, where the risk level increases sequentially. The shorter the current operating time, the higher the risk level represented by the target liquid slugging risk level corresponding to the current operating time. The first controlling module is used to control the air conditioner to shut down for a predetermined time based on the target liquid slugging risk level, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature, and to close the expansion valve after the predetermined time has elapsed.

[0089] In one embodiment of this application, the first control module includes a first control submodule, a second control submodule, and a third control submodule. The first control submodule is configured to control the air conditioner to shut down for a predetermined time and close the expansion valve after the predetermined time has elapsed when the target liquid slugging risk level is the first liquid slugging risk level, the current outer ring temperature is greater than the first outer ring temperature threshold, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than the second temperature difference threshold. The second control submodule is configured to control the air conditioner to shut down for a predetermined time and close the expansion valve after the predetermined time has elapsed when the target liquid slugging risk level is the second liquid slugging risk level, the current outer ring temperature is greater than the second outer ring temperature threshold, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than the second temperature difference threshold. Under the condition that the air conditioner is shut down for the predetermined time, and the expansion valve is closed after the predetermined time has elapsed, the second outer ring temperature threshold is less than the first outer ring temperature threshold, and the second temperature difference threshold is less than the first temperature difference threshold; the third control submodule is used to control the air conditioner to shut down for the predetermined time when the target liquid slugging risk level is the third liquid slugging risk level, the current outer ring temperature is greater than the third outer ring temperature threshold, and the difference between the current inner pipe temperature and the current outer pipe temperature is greater than the third temperature difference threshold, and after the predetermined time has elapsed, the expansion valve is closed, the third outer ring temperature threshold is less than the second outer ring temperature threshold, and the third temperature difference threshold is less than the second temperature difference threshold.

[0090] In one embodiment of this application, the control unit further includes a second determining module. After controlling the air conditioner to shut down for a predetermined time based on the target liquid slugging risk level, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature, and after closing the expansion valve after the predetermined time has elapsed, the second determining module is used to determine, if the target liquid slugging risk level is the second liquid slugging risk level or the third liquid slugging risk level, that the speed adjustment step of the outdoor unit's fan is a speed reduction preset value each time the outdoor unit's fan is turned on, until the speed of the outdoor unit's fan is the minimum wind speed threshold.

[0091] In one embodiment of this application, the control unit further includes an acquisition module, a second control module, a third control module, and a fourth control module. After controlling the air conditioner to shut down for a predetermined time based on the target liquid slugging risk level, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature, and after closing the expansion valve after the predetermined time has elapsed, the acquisition module is used to acquire the shutdown time of the outdoor unit at the current moment. The second control module is used to determine, when the air conditioner restarts, and the target liquid slugging risk level is the second liquid slugging risk level, and the shutdown time is less than a first shutdown time threshold, the temperature adjustment step size of the air conditioner for each subsequent temperature adjustment is [value missing]. The first preset adjustment value; the third control module is used to determine, when the air conditioner is restarted, the target liquid slugging risk level is the third liquid slugging risk level, and the downtime is greater than or equal to the first downtime threshold, that the temperature adjustment step size of the air conditioner is the first preset adjustment value each time the temperature of the air conditioner is adjusted subsequently; the fourth control module is used to determine, when the air conditioner is restarted, the target liquid slugging risk level is the third liquid slugging risk level, and the downtime is less than the first downtime threshold, that the temperature adjustment step size of the air conditioner is the second preset adjustment value each time the temperature of the air conditioner is adjusted subsequently, and the second preset adjustment value is greater than the first preset adjustment value.

[0092] In one embodiment of this application, the control unit further includes a fifth control module, a sixth control module, and a seventh control module. The fifth control module determines the temperature adjustment step size of the air conditioner to be the first preset adjustment value each time the air conditioner's temperature is adjusted, or determines the temperature adjustment step size to be the second preset adjustment value each time the air conditioner's temperature is adjusted. The sixth control module controls the air conditioner to shut down when the target liquid slugging risk level is the third liquid slugging risk level and the air conditioner's operating time is greater than or equal to a second start-up time threshold, where the second start-up time threshold is greater than the first start-up time threshold. The seventh control module controls the outdoor unit to start up when the target liquid slugging risk level is the third liquid slugging risk level and the outdoor unit's shutdown time is greater than or equal to a second shutdown time threshold, where the second shutdown time threshold is greater than the first shutdown time threshold.

[0093] In one embodiment of this application, the first determining module includes a first determining submodule, a second determining submodule, and a third determining submodule. The first determining submodule is used to determine the target liquid slugging risk level as the first liquid slugging risk level when the current running time is greater than a second power-on time threshold. The second determining submodule is used to determine the target liquid slugging risk level as the second liquid slugging risk level when the current running time is less than or equal to the second power-on time threshold and the current running time is greater than the first power-on time threshold, wherein the second power-on time threshold is greater than the first power-on time threshold. The third determining submodule is used to determine the target liquid slugging risk level as the third liquid slugging risk level when the current running time is equal to the first power-on time threshold.

[0094] The aforementioned air conditioner's anti-liquid-slugging device includes a processor and a memory. The acquisition unit and control unit, among others, are stored as program units in the memory. The processor executes these program units stored in the memory to achieve the corresponding functions. All of the aforementioned modules reside in the same processor; alternatively, the modules may be located in different processors in any combination.

[0095] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured. Adjusting kernel parameters can address the problem in air conditioners where, due to a large system charge, refrigerant flows into the indoor unit during pressure equalization, and upon restarting, a large amount of refrigerant in the evaporator returns to the compressor, causing compressor liquid slugging and damage.

[0096] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0097] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the air conditioner's anti-liquid-smash method.

[0098] This invention provides a processor for running a program, wherein the program executes the liquid-slugging prevention method for the air conditioner.

[0099] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps: An acquisition step: when the indoor temperature of the air conditioner's indoor unit reaches a predetermined temperature, the device acquires the air conditioner's current running time, the outdoor temperature of the air conditioner's outdoor unit at the current time, the indoor unit's temperature at the current time, and the outdoor unit's temperature at the current time, thus obtaining the current running time, current outer ring temperature, current inner pipe temperature, and current outer pipe temperature; A control step: when the current running time is greater than or equal to a first start-up time threshold, based on the current running time, current outer ring temperature, current inner pipe temperature, and current outer pipe temperature, the device controls the air conditioner to stop for a predetermined time, and closes the air conditioner's expansion valve after the predetermined time has elapsed. The expansion valve connects the indoor unit and the outdoor unit. The device described herein can be a server, PC, PAD, mobile phone, etc.

[0100] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps: An acquisition step: when the temperature of the indoor environment where the indoor unit of the air conditioner is located reaches a predetermined temperature, acquiring the current running time of the air conditioner, the temperature of the outdoor environment where the outdoor unit of the air conditioner is located at the current time, the temperature of the indoor unit at the current time, and the temperature of the outdoor unit at the current time, to obtain the current running time, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature; A control step: when the current running time is greater than or equal to a first start-up time threshold, controlling the air conditioner to stop for a predetermined time based on the current running time, the current outer ring temperature, the current inner pipe temperature, and the current outer pipe temperature, and closing the expansion valve of the air conditioner after the predetermined time has elapsed, wherein the expansion valve is used to connect the indoor unit and the outdoor unit.

[0101] This application also provides an air conditioner, comprising: an outdoor unit, an indoor unit, an expansion valve, and a controller. The outdoor unit and the indoor unit are connected via the expansion valve. The outdoor unit, the indoor unit, and the expansion valve communicate with the controller, which is used to execute any of the above-described anti-liquid slugging methods for the air conditioner. Because the higher the outdoor temperature and the lower the indoor temperature, and the higher the condenser temperature is compared to the evaporator temperature, the easier it is for refrigerant to migrate to the evaporator. Therefore, based on the current running time, current outer ring temperature, current inner pipe temperature, and the current outer pipe temperature, it is possible to accurately determine whether liquid slugging is likely to occur under the current conditions. This allows the air conditioner to be turned off first, and the expansion valve to be closed only after the internal environment of the air conditioner has reached equilibrium. This prevents the situation where closing the expansion valve cannot avoid liquid slugging when the internal environment of the air conditioner is unbalanced. Furthermore, it solves the problem that when the air conditioner has a large system charge, refrigerant flows into the indoor unit during the pressure balancing process, and upon restarting, a large amount of refrigerant in the evaporator returns to the compressor, causing compressor liquid slugging and damage.

[0102] like Figure 4 As shown ( Figure 4 (Controller not shown) The outdoor unit 100 includes a compressor 110, a first evaporator 120, an outdoor fan 130, a gas-liquid separator 140, and a four-way valve 150. The indoor unit 200 includes a second evaporator 210 and an indoor fan 220. The compressor 110 also includes a liquid receiver 111, which is connected to the gas-liquid separator 140. An expansion valve 300 is located between the indoor unit 200 and the outdoor unit 100, and the connection method is as follows: Figure 4 As shown, further details will not be elaborated here. Additionally, the compressor, indoor fan, and outdoor fan communicate with the controller, eliminating the need for additional temperature or pressure sensors to detect liquid slugging and thus reducing overall system cost. With long connecting pipes and high charge levels, after a system shutdown and restart, the vapor-liquid separator showed no signs of being overfilled, ensuring both comfortable operation and improved reliability.

[0103] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0104] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0105] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0106] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0107] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0108] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0109] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0110] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0111] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0112] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0113] 1) The anti-liquid slugging method for air conditioners in this application is designed to prevent refrigerant from migrating to the evaporator when the outdoor temperature is higher, the indoor temperature is lower, and the condenser temperature is higher than the evaporator temperature. Therefore, based on the current running time, current outer ring temperature, current inner pipe temperature, and the aforementioned current outer pipe temperature, it is possible to accurately determine whether liquid slugging is likely to occur under the current conditions. Thus, the air conditioner is turned off first, and the expansion valve is closed only after the internal environment of the air conditioner has reached equilibrium. This prevents the situation where closing the expansion valve cannot avoid liquid slugging when the internal environment of the air conditioner is unbalanced. This solves the problem that when the air conditioner has a large system charge, refrigerant flows into the indoor unit during the pressure balancing process, and when it is restarted, a large amount of refrigerant in the evaporator returns to the compressor, causing compressor liquid slugging and damage to the compressor.

[0114] 2) The anti-liquid slugging device for the air conditioner in this application is designed to prevent refrigerant from migrating to the evaporator when the outdoor temperature is higher, the indoor temperature is lower, and the condenser temperature is higher than the evaporator temperature. Therefore, based on the current running time, current outer ring temperature, current inner pipe temperature, and the aforementioned current outer pipe temperature, it can accurately determine whether liquid slugging is likely to occur under the current conditions. Thus, the air conditioner is turned off first, and the expansion valve is closed only after the internal environment of the air conditioner has reached equilibrium. This prevents the situation where closing the expansion valve cannot avoid liquid slugging when the internal environment of the air conditioner is unbalanced. In this way, it solves the problem that when the air conditioner has a large system charge, refrigerant flows into the indoor unit during the pressure balancing process, and when it is restarted, a large amount of refrigerant in the evaporator returns to the compressor, causing compressor liquid slugging and damage to the compressor.

[0115] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method of preventing liquid strike of an air conditioner, characterized by, The method comprises: an acquisition step of acquiring, in a case where a temperature of an indoor environment in which an indoor unit of an air conditioner is located reaches a predetermined temperature, a running time of the air conditioner at a current time, a temperature of an outdoor environment in which an outdoor unit of the air conditioner is located at the current time, a temperature of the indoor unit at the current time, and a temperature of the outdoor unit at the current time, to obtain a current running time, a current outdoor ring temperature, a current indoor pipe temperature, and a current outdoor pipe temperature; a control step of, in a case where the current running time is greater than or equal to a first starting time threshold, controlling the air conditioner to stop for a predetermined time according to the current running time, the current outdoor ring temperature, the current indoor pipe temperature, and the current outdoor pipe temperature, and closing an expansion valve of the air conditioner after the predetermined time elapses, wherein the expansion valve is used to connect the indoor unit and the outdoor unit.

2. The method of claim 1, wherein, In a case where the current running time is greater than or equal to a first starting time threshold, controlling the air conditioner to stop for a predetermined time according to the current running time, the current outdoor ring temperature, the current indoor pipe temperature, and the current outdoor pipe temperature, and closing an expansion valve of the air conditioner after the predetermined time elapses, comprises: In a case where the current running time is greater than or equal to a first starting time threshold, determining a target liquid strike risk level according to the current running time, the target liquid strike risk level being one of a first liquid strike risk level, a second liquid strike risk level, and a third liquid strike risk level in which the risk degree is sequentially increased, wherein the smaller the current running time is, the higher the risk degree represented by the target liquid strike risk level corresponding to the current running time is; controlling the air conditioner to stop for the predetermined time according to the target liquid strike risk level, the current outdoor ring temperature, the current indoor pipe temperature, and the current outdoor pipe temperature, and closing the expansion valve after the predetermined time elapses.

3. The method of claim 2, wherein, controlling the air conditioner to stop for the predetermined time according to the target liquid strike risk level, the current outdoor ring temperature, the current indoor pipe temperature, and the current outdoor pipe temperature, and closing the expansion valve after the predetermined time elapses, comprises: in a case where the target liquid strike risk level is the first liquid strike risk level, the current outdoor ring temperature is greater than a first outdoor ring temperature threshold, and a difference between the current indoor pipe temperature and the current outdoor pipe temperature is greater than a first temperature difference threshold, controlling the air conditioner to stop for the predetermined time, and closing the expansion valve after the predetermined time elapses; in a case where the target liquid strike risk level is the second liquid strike risk level, the current outdoor ring temperature is greater than a second outdoor ring temperature threshold, and a difference between the current indoor pipe temperature and the current outdoor pipe temperature is greater than a second temperature difference threshold, the second outdoor ring temperature threshold being less than the first outdoor ring temperature threshold, and the second temperature difference threshold being less than the first temperature difference threshold, controlling the air conditioner to stop for the predetermined time, and closing the expansion valve after the predetermined time elapses. in a case where the target liquid strike risk level is the third liquid strike risk level, and the current outer ring temperature is greater than a third outer ring temperature threshold value, and a difference between the current inner tube temperature and the current outer tube temperature is greater than a third temperature difference threshold value, controlling the air conditioner to stop for the predetermined time, and closing the expansion valve after the predetermined time elapses, the third outer ring temperature threshold value being less than the second outer ring temperature threshold value, and the third temperature difference threshold value being less than the second temperature difference threshold value.

4. The method of claim 2, wherein, after the step of controlling the air conditioner to stop for the predetermined time and closing the expansion valve after the predetermined time elapses according to the target liquid strike risk level, the current outer ring temperature, the current inner tube temperature, and the current outer tube temperature, the method further comprises: in a case where the target liquid strike risk level is the second liquid strike risk level, or the third liquid strike risk level, determining that a rotation speed adjustment step size of the fan of the outdoor unit is a speed-down preset value after each time the fan of the outdoor unit is turned on subsequently, until the rotation speed of the fan of the outdoor unit is a minimum rotation speed threshold value.

5. The method of claim 2, wherein, after the step of controlling the air conditioner to stop for the predetermined time and closing the expansion valve after the predetermined time elapses according to the target liquid strike risk level, the current outer ring temperature, the current inner tube temperature, and the current outer tube temperature, the method further comprises: acquiring a stop time of the outdoor unit at a current time; in a case where the air conditioner is started again, the target liquid strike risk level is the second liquid strike risk level, and the stop time is less than a first stop time threshold value, determining that a temperature adjustment step size of the air conditioner is a first preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently; in a case where the air conditioner is started again, the target liquid strike risk level is the third liquid strike risk level, and the stop time is greater than or equal to the first stop time threshold value, determining that the temperature adjustment step size of the air conditioner is the first preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently; in a case where the air conditioner is started again, the target liquid strike risk level is the third liquid strike risk level, and the stop time is less than the first stop time threshold value, determining that a temperature adjustment step size of the air conditioner is a second preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently, the second preset adjustment value being greater than the first preset adjustment value.

6. The method of claim 5, wherein, after the step of determining that the temperature adjustment step size of the air conditioner is the first preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently, or the step of determining that the temperature adjustment step size of the air conditioner is the second preset adjustment value after each time the temperature of the air conditioner is adjusted subsequently, the method further comprises: repeating the step of acquiring and the step of controlling; in a case where the target liquid strike risk level is the third liquid strike risk level, and the running time of the air conditioner is greater than or equal to a second start-up time threshold value, controlling the air conditioner to stop again, the second start-up time threshold value being greater than the first start-up time threshold value; In a case where the target liquid strike risk level is the third liquid strike risk level and the downtime of the outdoor unit is greater than or equal to a second downtime threshold, the outdoor unit is controlled to be started up again, and the second downtime threshold is greater than the first downtime threshold.

7. The method according to any one of claims 2 to 6, characterized in that, According to the current running time, a target liquid strike risk level is determined, including: In a case where the current running time is greater than a second start-up time threshold, the target liquid strike risk level is determined to be the first liquid strike risk level; In a case where the current running time is less than or equal to the second start-up time threshold and greater than the first start-up time threshold, the target liquid strike risk level is determined to be the second liquid strike risk level, and the second start-up time threshold is greater than the first start-up time threshold; In a case where the current running time is equal to the first start-up time threshold, the target liquid strike risk level is determined to be the third liquid strike risk level.

8. A liquid-throwing prevention device of an air conditioner, characterized by comprising: Including: An obtaining unit is configured to perform an obtaining step: in a case where the temperature of an indoor environment in which an indoor unit of an air conditioner is located reaches a predetermined temperature, obtaining a running time of the air conditioner at a current time, a temperature of an outdoor environment in which an outdoor unit of the air conditioner is located at the current time, a temperature of the indoor unit at the current time, and a temperature of the outdoor unit at the current time, to obtain a current running time, a current outdoor ring temperature, a current indoor pipe temperature, and a current outdoor pipe temperature; A control unit is configured to perform a control step: in a case where the current running time is greater than or equal to a first start-up time threshold, according to the current running time, the current outdoor ring temperature, the current indoor pipe temperature, and the current outdoor pipe temperature, the air conditioner is controlled to be stopped for a predetermined time, and after the predetermined time elapses, a valve of the air conditioner is closed, wherein the valve is used to communicate the indoor unit and the outdoor unit.

9. A computer-readable storage medium, characterized in that, The computer readable storage medium includes a stored program, wherein when the program runs, the device in which the computer readable storage medium is located performs the anti-liquid strike method of the air conditioner in any one of claims 1 to 7.

10. An air conditioner characterized by comprising: Including: An outdoor unit, an indoor unit, a valve, and a controller, the outdoor unit and the indoor unit are communicated through the valve, the outdoor unit, the indoor unit, and the valve respectively communicate with the controller, and the controller is configured to perform the anti-liquid strike method of the air conditioner in any one of claims 1 to 7.

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