Blockage detection method, blockage treatment method, control device and air conditioning system

Abstract

The invention discloses a blockage detection method, a blockage treatment method, a control device and an air conditioning system. The blockage detection method comprises the steps that temperature parameters, pressure parameters and power parameters of the air conditioning system are obtained, and whether the air conditioning system is blocked or not is judged according to the temperature parameters, the pressure parameters and the power parameters of the air conditioning system; and on the basis that the temperature parameter meets the first preset condition, the pressure parameter meets the second preset condition and the power parameter meets the third preset condition, it is judged that the air conditioning system is blocked. According to the blockage detection method, blockage of the air conditioning system can be found in time, and blockage can be treated conveniently in time to prevent abnormal operation of the system caused by blockage.

Description

Technical Field

[0001] The present application relates to but is not limited to the field of air-conditioning technology, and specifically refers to a blockage detection method, a blockage processing method, a control device and an air-conditioning system. Background Art

[0002] As the world pays more and more attention to environmental issues, the use of refrigerants with low GWP (Global Warming Potential) in air conditioners is gaining more and more attention. However, due to the small amount of some low-GWP refrigerants in air conditioners and the high miscibility between refrigerants and lubricants, the air conditioner is prone to lubricant blockage or ice blockage during operation, causing system operation abnormalities and bringing hidden dangers and risks to the long-term operation of the air conditioner. Summary of the invention

[0003] One purpose of the present application is to provide a blockage detection method for an air-conditioning system, which can promptly detect blockage in the air-conditioning system and facilitate timely processing of the blockage to prevent the blockage from causing abnormal system operation.

[0004] Another object of the present application is to provide a method for handling blockages in an air-conditioning system, which can promptly handle blockages in the air-conditioning system and effectively determine whether the blockage has been resolved.

[0005] Another object of the present application is to provide a control device and an air conditioner.

[0006] To this end, an embodiment of the present application provides a blockage detection method for an air conditioning system, the blockage detection method comprising:

[0007] Acquiring temperature parameters, pressure parameters and power parameters of the air conditioning system, and determining whether the air conditioning system is blocked according to the temperature parameters, pressure parameters and power parameters of the air conditioning system;

[0008] Based on the temperature parameter satisfying a first preset condition, the pressure parameter satisfying a second preset condition, and the power parameter satisfying a third preset condition, it is determined that the air conditioning system is blocked.

[0009] The blockage detection method provided in the embodiment of the present application can obtain the temperature parameters, pressure parameters and power parameters of the air-conditioning system during the operation of the air-conditioning system. Since the temperature parameters, pressure parameters and power parameters of the air-conditioning system will change accordingly when the air-conditioning system is blocked, it is possible to judge whether the air-conditioning system is blocked based on the temperature parameters, pressure parameters and power parameters of the air-conditioning system. When the temperature parameter of the air-conditioning system meets the first preset condition, the pressure parameter meets the second preset condition, and the power parameter meets the third preset condition, it can be determined that the air-conditioning system is blocked. Otherwise, it can be determined that the air-conditioning system is not blocked to prevent misjudgment. The blockage detection method can accurately determine whether the throttling component of the air-conditioning system is blocked, so as to facilitate timely corresponding processing when the air-conditioning system is blocked to avoid abnormal operation of the system.

[0010] The present application also provides a blockage processing method for an air conditioning system, the blockage processing method comprising:

[0011] Based on determining that the air conditioning system is blocked, performing a blockage resolution operation;

[0012] Acquiring temperature parameters, pressure parameters and power parameters of the air conditioning system, and judging whether the blockage of the air conditioning system is resolved according to the temperature parameters, pressure parameters and power parameters of the air conditioning system;

[0013] Based on the fact that the temperature parameter satisfies the fourth preset condition, the pressure parameter satisfies the fifth preset condition, and the power parameter satisfies the sixth preset condition, it is determined that the blockage of the air-conditioning system has been resolved.

[0014] The congestion handling method provided in the embodiment of the present application can perform a congestion resolution operation to handle the congestion phenomenon when it is determined that the air-conditioning system is congested, and the temperature parameters, pressure parameters and power parameters of the air-conditioning system can be obtained. Because the temperature parameters, pressure parameters and power parameters of the air-conditioning system will change accordingly before and after the air-conditioning system is blocked, it can be determined whether the congestion is resolved based on the temperature parameters, pressure parameters and power parameters of the air-conditioning system. When the temperature parameter of the air-conditioning system meets the fourth preset condition, the pressure parameter meets the fifth preset condition, and the power parameter meets the sixth preset condition, it can be determined that the congestion of the air-conditioning system has been resolved. Otherwise, it can be determined that the congestion of the air-conditioning system has not been resolved to prevent misjudgment from continuing the congestion and causing the system to be abnormal. The congestion handling method can accurately determine whether the congestion of the throttling component of the air-conditioning system has been resolved after performing the congestion handling operation, so as to facilitate timely stopping of the congestion handling operation to avoid affecting the system performance.

[0015] An embodiment of the present application also provides a control device, including a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the congestion detection method as described in any of the above embodiments or the steps of the congestion processing method as described in any of the above embodiments are implemented.

[0016] An embodiment of the present application also provides an air-conditioning system, comprising: a refrigerant circuit, comprising an indoor heat exchanger, a throttling component and an outdoor heat exchanger connected in series through a pipeline; a first bypass branch, one end of which is connected to an end of the indoor heat exchanger away from the throttling component, and the other end is connected to an end of the throttling component close to the outdoor heat exchanger, so that the first bypass branch is connected in parallel with the indoor heat exchanger and the throttling component, and the first bypass branch is provided with a first valve; a second bypass branch, one end of which is connected to an end of the outdoor heat exchanger away from the throttling component, and the other end is connected to an end of the throttling component close to the indoor heat exchanger, so that the second bypass branch is connected in parallel with the outdoor heat exchanger and the throttling component, and the second bypass branch is provided with a second valve; and a control device as described in the above embodiment, electrically connected to the first valve and the second valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an air conditioning system provided in some embodiments of the present application;

[0018] Figure 2 for Figure 1 The structural schematic diagram of the air conditioning system shown is when operating in cooling mode or defrosting mode;

[0019] Figure 3 for Figure 1 The structural schematic diagram of the air conditioning system shown in FIG. 1 is when operating in a heating mode;

[0020] Figure 4 A schematic diagram of a flow chart of a blockage detection method provided in some embodiments of the present application;

[0021] Figure 5 A flowchart of a blockage detection method provided by an embodiment of the present application;

[0022] Figure 6 A schematic diagram of a blockage treatment method provided in some embodiments of the present application;

[0023] Figure 7 A schematic flow chart of a blockage treatment method provided in accordance with an embodiment of the present application.

[0024] Figures 1 to 3 The parts represented by the various reference numerals are listed as follows:

[0025] 1 compressor, 2 four-way valve, 3 outdoor heat exchanger, 4 throttling component, 41 first port, 42 second port, 5 indoor heat exchanger, 61 first bypass branch, 611 first valve, 62 second bypass branch, 621 second valve, 71 first temperature sensor, 72 second temperature sensor, 81 first pressure sensor, 82 second pressure sensor. DETAILED DESCRIPTION

[0026] The principles and features of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0027] The compressor is one of the core components of the air conditioning system. When the compressor is operating normally, the lubricating oil is sucked into the cylinder from the bottom of the compressor through the crankshaft. After being compressed, it enters the system along with the high-temperature and high-pressure refrigerant, and then returns to the compressor again with the refrigerant circulation. If there is a blockage in the pipeline, it is easy to cause the compressor to return oil and air smoothly, resulting in problems such as insufficient compressor lubricating oil and motor idling overheating. The existing compressor lubricating oil is mostly ordinary mineral lubricating oil, and the viscosity of this lubricating oil will increase sharply under low temperature conditions. In this case, when the low-temperature lubricating oil and refrigerant in the pipeline pass through the throttling component, it is easy to cause the throttling component to be blocked by the lubricating oil.

[0028] Especially for the existing air-conditioning system using R290 refrigerant with better environmental performance, since R290 refrigerant is flammable, for safety reasons, the injection amount of R290 refrigerant is generally relatively small, so the pressure in the system is also relatively small, which further increases the possibility of throttling component blockage.

[0029] In addition to lubricating oil blockage, various types of blockages such as ice blockage may also occur in the air-conditioning system pipes, and various types of blockages are most likely to occur in locations with smaller pipe diameters, especially in throttling components.

[0030] To this end, an embodiment of the present application provides a blockage detection method for an air conditioning system.

[0031] like Figure 1 As shown, the air conditioning system includes a refrigeration circuit. The refrigeration circuit includes an indoor heat exchanger 5, a throttling component 4 and an outdoor heat exchanger 3 connected in series through pipelines.

[0032] The air conditioning system also includes a compressor 1 and a control valve. The control valve may be, but is not limited to, a four-way valve 2. The compressor 1 has an exhaust port and an air intake port. The four-way valve 2 has a D port, an E port, an S port, and a C port. The D port is connected to the exhaust port of the compressor 1, and the S port is connected to the air intake port of the compressor 1. One port of the indoor heat exchanger 5 is connected to the C port, and the other port is connected to the first port 41 of the throttling component 4. One port of the outdoor heat exchanger 3 is connected to the E port, and the other port is connected to the second port 42 of the throttling component 4.

[0033] The operating modes of the air conditioner include but are not limited to: cooling mode, heating mode, and defrost mode. The cooling mode generally operates under conditions with high outdoor ambient temperature (such as summer). The heating mode and defrost mode generally operate under conditions with low outdoor ambient temperature (such as winter). The refrigerant flow direction of the cooling mode and defrost mode is the same. The refrigerant flow direction of the cooling mode is opposite to that of the heating mode.

[0034] Among them, Figure 2 As shown, in the cooling mode / defrosting mode, the D port of the four-way valve 2 is connected to the E port, and the C port is connected to the S port. The refrigerant flow direction of the system is: the refrigerant discharged from the exhaust port of the compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 2, and the refrigerant discharged from the outdoor heat exchanger 3 enters the throttling component 4 through the second port 42 of the throttling component 4, and enters the indoor heat exchanger 5 after being discharged from the first port 41 of the throttling component 4, and then flows back to the suction port of the compressor 1 through the four-way valve 2.

[0035] like Figure 3 As shown, in the heating mode, the D port of the four-way valve 2 is connected to the C port, and the E port is connected to the S port. The refrigerant flow direction of the system is: the refrigerant discharged from the exhaust port of the compressor 1 enters the indoor heat exchanger 5 through the four-way valve 2, and the refrigerant discharged from the indoor heat exchanger 5 enters the throttling component 4 through the first port 41 of the throttling component 4, and enters the outdoor heat exchanger 3 after being discharged from the second port 42 of the throttling component 4, and then flows back to the suction port of the compressor 1 through the four-way valve 2.

[0036] Among them, the blockage of the throttling component 4 often occurs when the heating mode and the defrosting mode are switched, and the reasons are as follows:

[0037] In heating mode, due to the low temperature of the outdoor unit, the oil content in the refrigerant (i.e., the refrigerant) is reduced, and the lubricating oil is precipitated from the refrigerant, and the viscosity is high, adhering to the pipe wall. At this time, the outdoor unit has more oil (i.e., more accumulated oil). When the heating mode is switched to the defrosting mode, the refrigerant flows in the opposite direction, and the high-temperature refrigerant discharged from the compressor 1 flows through the outdoor unit, so that the oil accumulated in the outdoor unit is dissolved in the refrigerant. At this time, the oil content of the high-temperature refrigerant increases, and the temperature drops sharply after flowing through the throttling component 4. The refrigerant with a high oil content is very likely to block the outlet of the throttling component 4 (i.e., the first port 41), causing the system to become abnormal.

[0038] In the defrost mode, due to the low temperature of the indoor unit, the oil content in the refrigerant is reduced, the lubricating oil is precipitated from the refrigerant, and the viscosity is high, adhering to the pipe wall surface, at this time the indoor unit has more oil (i.e. more accumulated oil). When the defrost mode is switched to the heating mode, the refrigerant flows in the reverse direction, the high-temperature refrigerant discharged from the compressor 1 flows through the indoor unit, so that the oil accumulated in the indoor unit is dissolved in the refrigerant, at this time the oil content of the high-temperature refrigerant increases, and the temperature drops sharply after flowing through the throttling component 4, and the refrigerant with a high oil content is very likely to block the outlet of the throttling component 4 (i.e. the second port 42), causing the system to become abnormal.

[0039] The inventors of the present application have discovered through research that when the throttling component 4 of the air-conditioning system is blocked, the air-conditioning system has the following characteristics: the system power is significantly reduced, the outlet pressure of the throttling component 4 drops to negative pressure, the outlet temperature of the throttling component 4 is low, the temperature of the indoor heat exchanger 5 is close to the indoor ambient temperature, and the temperature of the outdoor heat exchanger 3 is close to the outdoor ambient temperature.

[0040] Based on this, Figure 4 As shown, the embodiment of the present application provides a blockage detection method, including:

[0041] Step S202: obtaining temperature parameters, pressure parameters and power parameters of the air-conditioning system, and determining whether the air-conditioning system is blocked according to the temperature parameters, pressure parameters and power parameters of the air-conditioning system;

[0042] Step S204: based on the temperature parameter satisfying the first preset condition, the pressure parameter satisfying the second preset condition, and the power parameter satisfying the third preset condition, it is determined that the air conditioning system is blocked.

[0043] The blockage detection method provided in the embodiment of the present application can obtain the temperature parameters, pressure parameters and power parameters of the air-conditioning system during the operation of the air-conditioning system. Since the temperature parameters, pressure parameters and power parameters of the air-conditioning system will change accordingly when the air-conditioning system is blocked, it is possible to judge whether the air-conditioning system is blocked based on the temperature parameters, pressure parameters and power parameters of the air-conditioning system. When the temperature parameter of the air-conditioning system meets the first preset condition, the pressure parameter meets the second preset condition, and the power parameter meets the third preset condition, it can be determined that the air-conditioning system is blocked. Otherwise, it can be determined that the air-conditioning system is not blocked to prevent misjudgment. The blockage detection method can accurately determine whether the throttling component 4 of the air-conditioning system is blocked, so as to facilitate timely corresponding processing when the air-conditioning system is blocked to avoid abnormal operation of the system.

[0044] In some exemplary embodiments, judging whether the air conditioning system is blocked according to the temperature parameter, pressure parameter and power parameter of the air conditioning system includes the following three first sub-judgment steps:

[0045] Determining whether a temperature parameter of the air conditioning system meets a first preset condition;

[0046] Determining whether a pressure parameter of the air conditioning system meets a second preset condition;

[0047] It is determined whether the power parameter of the air conditioning system meets the third preset condition.

[0048] The execution order of the above three first sub-judgment steps is not restricted and can be performed simultaneously; or they can be performed in sequence, and the specific sequence is not restricted. When one condition is met, the next first sub-judgment step is performed. If a condition is not met, it can be directly determined that the air-conditioning system is not blocked.

[0049] In one embodiment, judging whether the air conditioning system is blocked according to the temperature parameter, pressure parameter and power parameter of the air conditioning system includes:

[0050] Determine whether the temperature parameter of the air conditioning system meets the first preset condition, if so, execute the next sub-determination step, if not, determine that the air conditioning system is not blocked, and restart the blockage detection;

[0051] Determine whether the pressure parameter of the air conditioning system meets the second preset condition, if so, execute the next sub-determination step, if not, determine that the air conditioning system is not blocked, and restart the blockage detection;

[0052] It is determined whether the power parameter of the air conditioning system meets the third preset condition. If so, it is determined that the air conditioning system is blocked. If not, it is determined that the air conditioning system is not blocked and the blockage detection is restarted.

[0053] In some exemplary embodiments, the temperature parameters include: indoor ambient temperature T1, indoor heat exchanger 5 temperature T2, outdoor heat exchanger 3 temperature T3, outdoor ambient temperature T4, and outlet temperature T of throttling component 4. T2 may be the middle temperature of indoor heat exchanger 5, and T3 may be the outlet temperature of outdoor heat exchanger 3.

[0054] The first preset condition includes: the outlet temperature T of the throttling component 4 is less than the pour point temperature Ts of the lubricating oil (i.e.: T<Ts), the absolute value of the difference between the temperature T1 of the indoor heat exchanger 5 and the indoor ambient temperature T2 is less than the first preset difference △T1 (i.e.: |T1-T2|<△T1), and the absolute value of the difference between the temperature T3 of the outdoor heat exchanger 3 and the outdoor ambient temperature T4 is less than the second preset difference △T2 (i.e.: |T3-T4|<△T2).

[0055] The first preset difference may be equal to the second preset difference.

[0056] In some embodiments, the first preset difference is in the range of 1°C to 2°C, such as 1°C, 1.5°C, 2°C, etc. The second preset difference is in the range of 1°C to 2°C, such as 1°C, 1.5°C, 2°C, etc.

[0057] Of course, the value ranges of the first preset difference and the second preset difference are not limited to the above ranges and can be adjusted as needed.

[0058] The pour point temperature of a lubricating oil, also known as the freezing point temperature, refers to the temperature at which the lubricating oil begins to become viscous and eventually solidifies when the temperature is lowered. This temperature affects the fluidity and lubrication performance of the lubricating oil in a low-temperature environment. The higher the pour point temperature, the easier it is for the lubricating oil to solidify in a low-temperature environment, resulting in a decrease in lubrication ability. Therefore, a lower pour point temperature generally means that the lubricating oil maintains good fluidity and lubrication performance in cold conditions.

[0059] When the outlet temperature T of the throttling component 4 is less than the pour point temperature Ts of the lubricating oil, that is, when T<Ts, it indicates that the lubricating oil is easy to become viscous or even solidified, and thus the risk of clogging is very high. When the absolute value of the difference between the temperature of the indoor heat exchanger 5 and the indoor ambient temperature is less than the first preset difference, that is, when |T1-T2|<△T1, it indicates that the temperature of the indoor heat exchanger 5 is relatively close to the indoor ambient temperature, which is consistent with the characteristic performance of the temperature parameters of the air-conditioning system when the throttling component 4 is blocked, and thus the risk of clogging is very high. When the absolute value of the difference between the temperature of the outdoor heat exchanger 3 and the outdoor ambient temperature is less than the second preset difference, that is, when |T3-T4|<△T2, it indicates that the temperature of the outdoor heat exchanger 3 is relatively close to the outdoor ambient temperature, which is consistent with the characteristic performance of the temperature parameters of the air-conditioning system when the throttling component 4 is blocked, and thus the risk of clogging is very high.

[0060] It can be determined that the temperature parameter of the air-conditioning system meets the first preset condition, indicating that the risk of blockage of the air-conditioning system is high.

[0061] In some exemplary embodiments, the pressure parameter includes: the outlet gauge pressure P of the throttling component 4 .

[0062] The second preset condition includes: the outlet gauge pressure P of the throttling component 4 is less than 0.

[0063] Gauge pressure refers to the amount by which the total absolute pressure exceeds the surrounding atmospheric pressure or the pressure at a certain point in the liquid that is higher than the atmospheric pressure.

[0064] When the outlet gauge pressure P of the throttling component 4 is less than 0, that is, P<0, it indicates that the outlet gauge pressure of the throttling component 4 is negative pressure, that is, the outlet pressure of the throttling component 4 is less than the atmospheric pressure. This is consistent with the characteristic performance of the pressure parameters of the air conditioning system when the throttling component 4 is blocked, so the risk of blockage is very high.

[0065] It can be determined that the pressure parameter of the air-conditioning system meets the second preset condition, indicating that the risk of blockage of the air-conditioning system is high.

[0066] In some exemplary embodiments, the power parameter includes: the whole machine current value I. The third preset condition includes: the whole machine current value I is less than β times of the whole machine current preset value I0 corresponding to the current outdoor ambient temperature (ie, I<I0×β), 0<β≤1.

[0067] In other exemplary embodiments, the power parameter includes: the whole machine power value W. The third preset condition includes: the whole machine power value W is less than β times of the whole machine power preset value W0 corresponding to the current outdoor ambient temperature (ie W<W0×β), 0<β≤1.

[0068] The whole current value I of the air conditioning system refers to the input current of the air conditioning system, that is, the current obtained by the air conditioning system from the power supply. The whole power value W of the air conditioning system refers to the total power consumed by the entire air conditioning system when it is running.

[0069] The whole power value W of the air-conditioning system = the whole current value I × the voltage, and the voltage remains unchanged. Therefore, the whole power value W of the air-conditioning system is proportional to the whole current value I. The change of the whole current value I can be used to characterize the change of the whole power value W, or the whole power value W can be directly used for judgment.

[0070] The whole machine current preset value I0 and the whole machine power preset value W0 are the whole machine current value and the whole machine power value of the air conditioning system under normal circumstances, that is, when the air conditioning system is not blocked. Under normal circumstances, that is, when the air conditioning system is not blocked, the whole machine power value W of the air conditioning system has a corresponding relationship with the current outdoor ambient temperature and will change with the change of the current ambient temperature. Therefore, the whole machine current preset value I0 has a corresponding relationship with the current outdoor ambient temperature, and the corresponding relationship can be pre-stored in the control device or in the cloud. The whole machine power preset value W0 has a corresponding relationship with the current outdoor ambient temperature, and the corresponding relationship can be pre-stored in the control device or in the cloud.

[0071] When the whole machine current value I is less than β times of the whole machine current preset value I0 corresponding to the current outdoor ambient temperature, that is, I<I0×β, and 0<β≤1, it indicates that the whole machine current value I is significantly reduced, and thus the whole machine power value is also significantly reduced. This is consistent with the characteristic performance of the power parameters of the air conditioning system when the throttling component 4 is blocked, so the risk of blockage is very high.

[0072] Alternatively, when the whole machine power value W is less than β times of the whole machine power preset value W0 corresponding to the current outdoor ambient temperature, that is, W<W0×β, and 0<β≤1, it indicates that the whole machine power value is significantly reduced. This is consistent with the characteristic performance of the power parameters of the air conditioning system when the throttling component 4 is blocked, so the risk of blockage is very high.

[0073] It can be determined that the power parameter of the air-conditioning system meets the third preset condition, indicating that the risk of blockage of the air-conditioning system is high.

[0074] In some embodiments, 0<β≤0.7, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0075] Of course, the value range of β is not limited to the above range and can be adjusted as needed.

[0076] In some exemplary embodiments, before step S202, the blockage detection method further includes:

[0077] The operating mode of the air conditioning system is determined, and step S202 is performed according to the determined operating mode.

[0078] Since the refrigerant flows in different directions in the air-conditioning system in different operating modes, the outlet of the throttling component 4 is also different. In the cooling mode / defrosting mode, the first port 41 of the throttling component 4 is the outlet. In the heating mode, the second port 42 of the throttling component 4 is the outlet. Therefore, the operating mode of the air-conditioning system is determined first, so as to facilitate the subsequent accurate acquisition of the outlet pressure and outlet temperature of the throttling component 4.

[0079] The operation mode of the air conditioning system can be determined by the state of the four-way valve 2, and the state of the four-way valve 2 can be represented by 0 and -1. When the state of the four-way valve 2 is 0, the D port of the four-way valve 22 is connected to the E port, and the C port is connected to the S port. At this time, the operation mode of the air conditioning system is the cooling mode or the defrosting mode. When the state of the four-way valve 2 is -1, the D port of the four-way valve 22 is connected to the C port, and the E port is connected to the S port. At this time, the operation mode of the air conditioning system is the heating mode.

[0080] In some exemplary embodiments, the blockage detection method further includes:

[0081] Step S202 is repeatedly executed at every preset time interval.

[0082] In other words, during the operation of the air-conditioning system, the blockage detection logic is executed periodically, which makes it easy to detect blockage in the air-conditioning system in a timely manner, and then take timely measures to prevent the blockage from causing abnormal operation of the system.

[0083] As for the specific size of the preset duration, it can be reasonably set according to needs and no specific restrictions are made here.

[0084] In some exemplary embodiments, the blockage detection method further includes:

[0085] Based on the outdoor environment temperature T4 being lower than the preset temperature, the preset time is shortened.

[0086] When the outdoor ambient temperature T4 is lower than the preset temperature, it indicates that the outdoor ambient temperature is low and the risk of blockage is high. Therefore, shortening the preset time, that is, shortening the blockage detection cycle, is conducive to timely detection of blockage in the air-conditioning system, and then timely processing can be made to prevent abnormal system operation caused by blockage.

[0087] The preset temperature may be within a range of, but not limited to, less than or equal to, 2°C.

[0088] In some exemplary embodiments, the blockage detection method further includes:

[0089] Switch the refrigerant flow direction based on the air conditioning system to shorten the preset time.

[0090] The air conditioning system switches the refrigerant flow direction, which usually occurs when the outdoor ambient temperature is low. The heating mode switches to the defrost mode, and then switches back to the heating mode after the defrost is completed. The risk of blockage when switching between the heating mode and the defrost mode is particularly high. The reasons can be found in the previous introduction and will not be repeated here.

[0091] Therefore, when the air-conditioning system switches the refrigerant flow direction, it is also necessary to shorten the preset time, that is, shorten the blockage detection cycle. This is conducive to timely detection of blockage in the air-conditioning system, and then timely processing can be made to prevent abnormal system operation caused by blockage.

[0092] Moreover, the preset duration in this case may be the shortest preset duration. The shortest preset duration may be in the range of, but not limited to, 3s to 7s, such as 3s, 4s, 5s, 6s, 7s, etc.

[0093] like Figure 6 As shown, the embodiment of the present application also provides a blockage processing method for an air conditioning system, comprising:

[0094] Step S302: Based on determining that the air conditioning system is blocked, performing a blockage resolution operation;

[0095] Step S304: obtaining the temperature parameter, pressure parameter and power parameter of the air conditioning system, and judging whether the blockage of the air conditioning system is solved according to the temperature parameter, pressure parameter and power parameter of the air conditioning system;

[0096] Step S306: Based on the temperature parameter satisfying the fourth preset condition, the pressure parameter satisfying the fifth preset condition, and the power parameter satisfying the sixth preset condition, it is determined that the blockage of the air conditioning system has been resolved.

[0097] The congestion handling method provided in the embodiment of the present application can perform a congestion resolution operation to handle the congestion phenomenon when it is determined that the air-conditioning system is congested, and the temperature parameters, pressure parameters and power parameters of the air-conditioning system can be obtained. Because the temperature parameters, pressure parameters and power parameters of the air-conditioning system will change accordingly before and after the air-conditioning system is blocked, it can be determined whether the congestion is resolved based on the temperature parameters, pressure parameters and power parameters of the air-conditioning system. When the temperature parameter of the air-conditioning system meets the fourth preset condition, the pressure parameter meets the fifth preset condition, and the power parameter meets the sixth preset condition, it can be determined that the congestion of the air-conditioning system has been resolved. Otherwise, it can be determined that the congestion of the air-conditioning system has not been resolved to prevent misjudgment from continuing the congestion and causing the system to be abnormal. The congestion handling method can accurately determine whether the congestion of the throttling component 4 of the air-conditioning system has been resolved after performing the congestion handling operation, so as to facilitate timely stopping of the congestion handling operation to avoid affecting the system performance.

[0098] In some exemplary embodiments, judging whether the blockage of the air conditioning system is resolved according to the temperature parameter, pressure parameter and power parameter of the air conditioning system includes the following three second sub-judgment steps:

[0099] Determining whether the temperature parameter of the air conditioning system meets a fourth preset condition;

[0100] Determining whether the pressure parameter of the air conditioning system meets the fifth preset condition;

[0101] It is determined whether the power parameter of the air conditioning system meets a sixth preset condition.

[0102] The execution order of the above three second sub-judgment steps is not restricted and can be performed simultaneously; or they can be performed in sequence, and the specific sequence is not restricted. When one condition is met, the next second sub-judgment step is performed.

[0103] In one embodiment, judging whether the blockage of the air conditioning system is resolved according to the temperature parameter, pressure parameter and power parameter of the air conditioning system includes:

[0104] Determine whether the temperature parameter of the air conditioning system meets the fourth preset condition, if yes, execute the next second sub-determination step, if no, continue to execute the blockage processing operation and determine whether the blockage is resolved;

[0105] Determine whether the pressure parameter of the air conditioning system meets the fifth preset condition, if yes, execute the next second sub-determination step, if no, continue to execute the blockage processing operation and determine whether the blockage is resolved;

[0106] Determine whether the power parameter of the air conditioning system meets the sixth preset condition. If so, determine that the blockage of the air conditioning system has been resolved. If not, continue to perform the blockage processing operation and determine whether the blockage has been resolved.

[0107] In some exemplary embodiments, the temperature parameters include: indoor ambient temperature T1, indoor heat exchanger 5 temperature T2, outdoor heat exchanger 3 temperature T3, outdoor ambient temperature T4, and outlet temperature T of throttling component 4. T2 may be the middle temperature of indoor heat exchanger 5, and T3 may be the outlet temperature of outdoor heat exchanger 3.

[0108] The fourth preset condition includes: the outlet temperature T of the throttling component 4 is greater than or equal to the pour point temperature Ts of the lubricating oil (i.e.: T≥Ts), the absolute value of the difference between the temperature T1 of the indoor heat exchanger 5 and the indoor ambient temperature T2 is greater than or equal to the third preset difference (i.e.: |T1-T2|≥△T3), and the absolute value of the difference between the temperature T3 of the outdoor heat exchanger 3 and the outdoor ambient temperature T4 is greater than or equal to the fourth preset difference (i.e.: |T3-T4|≥△T4).

[0109] The third preset difference may be equal to the fourth preset difference. The third preset difference may be equal to the aforementioned first preset difference. The fourth preset difference may be equal to the aforementioned second preset difference.

[0110] In some embodiments, the third preset difference is in the range of 1°C to 2°C, such as 1°C, 1.5°C, 2°C, etc. The fourth preset difference is in the range of 1°C to 2°C, such as 1°C, 1.5°C, 2°C, etc.

[0111] Of course, the value ranges of the third preset difference and the fourth preset difference are not limited to the above ranges and can be adjusted as needed.

[0112] When the outlet temperature T of the throttling component 4 is greater than or equal to the pour point temperature Ts of the lubricating oil, that is, T≥Ts, it indicates that the outlet temperature T of the throttling component 4 has increased, and the lubricating oil is not easy to become viscous or even solidified, which indicates that the air conditioning system is likely to have resumed normal operation, and the blockage may have been solved. When the absolute value of the difference between the temperature of the indoor heat exchanger 5 and the indoor ambient temperature is greater than or equal to the first preset difference, that is, |T1-T2|≥△T3, it indicates that there is a large temperature difference between the temperature of the indoor heat exchanger 5 and the indoor ambient temperature, which is consistent with the characteristic performance of the temperature parameters of the air conditioning system before the throttling component 4 is blocked, which indicates that the air conditioning system is likely to have resumed normal operation, and the blockage may have been solved. When the absolute value of the difference between the temperature of the outdoor heat exchanger 3 and the outdoor ambient temperature is greater than or equal to the second preset difference, that is, |T3-T4|≥△T4, it indicates that there is a large temperature difference between the temperature of the outdoor heat exchanger 3 and the outdoor ambient temperature, which is consistent with the characteristic performance of the temperature parameters of the air conditioning system before the throttling component 4 is blocked, which indicates that the air conditioning system is likely to have resumed normal operation, and the blockage may have been solved.

[0113] It can be determined that the temperature parameter of the air-conditioning system meets the fourth preset condition, indicating that the probability of resolving the blockage of the air-conditioning system is high.

[0114] In some exemplary embodiments, the pressure parameter includes: the outlet gauge pressure P of the throttling component 4 .

[0115] The fifth preset condition includes: the outlet gauge pressure P of the throttling component 4 is greater than or equal to 0 (ie: P≥0).

[0116] When the outlet gauge pressure P of the throttling component 4 is greater than or equal to 0, that is, P ≥ 0, it indicates that the outlet gauge pressure of the throttling component 4 is no longer negative pressure. This indicates that the outlet gauge pressure P of the throttling component 4 has increased significantly, which is consistent with the characteristic performance of the pressure parameters of the air-conditioning system before the throttling component 4 is blocked, which indicates that the air-conditioning system is likely to have resumed normal operation, and the blockage may have been resolved.

[0117] It can be determined that the pressure parameter of the air-conditioning system meets the fifth preset condition, indicating that the probability of resolving the blockage of the air-conditioning system is high.

[0118] In some exemplary embodiments, the power parameter includes: the whole machine current value I. The sixth preset condition includes: the whole machine current value I is greater than or equal to α times the whole machine current preset value I0 corresponding to the current outdoor ambient temperature (ie: I≥I0×α). α may be equal to the aforementioned β.

[0119] In some other exemplary embodiments, the power parameter includes: the whole machine power value W. The sixth preset condition includes: the whole machine power value W is greater than or equal to α times the whole machine power preset value W0 corresponding to the current outdoor ambient temperature (ie: W≥W0×α). α may be equal to the aforementioned β.

[0120] When the whole machine current value I is greater than or equal to α times the whole machine current preset value I0 corresponding to the current outdoor ambient temperature, that is, I≥I0×α, and 0<α≤1, it indicates that the whole machine current value I has increased significantly, and thus the whole machine power value has also increased significantly, which is consistent with the characteristic performance of the power parameters of the air-conditioning system before the aforementioned throttling component 4 is blocked, which means that the air-conditioning system may have resumed normal operation, and thus the blockage may have been resolved.

[0121] Alternatively, when the whole machine power value W is greater than or equal to α times the whole machine power preset value W0 corresponding to the current outdoor ambient temperature, that is, W≥W0×α, and 0<α≤1, it indicates that the whole machine power value has increased significantly, which is consistent with the characteristic performance of the power parameters of the air-conditioning system before the aforementioned throttling component 4 is blocked, which means that the air-conditioning system may have resumed normal operation, and the blockage may have been resolved.

[0122] It can be determined that the power parameter of the air-conditioning system meets the sixth preset condition, indicating that the probability of resolving the blockage of the air-conditioning system is high.

[0123] In some embodiments, 0<α≤0.7, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0124] Of course, the value range of α is not limited to the above range and can be adjusted as needed.

[0125] In some exemplary embodiments, before step S304, the blockage detection method further includes:

[0126] The operating mode of the air conditioning system is determined, and step S304 is performed according to the determined operating mode.

[0127] Since the refrigerant flows in different directions in the system under different operating modes, the outlet of the throttling component 4 is also different. In the cooling mode / defrosting mode, the first port 41 of the throttling component 4 is the outlet. In the heating mode, the second port 42 of the throttling component 4 is the outlet. Therefore, the operating mode of the air-conditioning system is determined first, so as to facilitate the subsequent accurate acquisition of the outlet pressure and outlet temperature of the throttling component 4.

[0128] The operation mode of the air conditioning system can be determined by the state of the four-way valve 2, and the state of the four-way valve 2 can be represented by 0 and -1. When the state of the four-way valve 2 is 0, the D port of the four-way valve 2 is connected to the E port, and the C port is connected to the S port. At this time, the operation mode of the air conditioning system is the cooling mode or the defrosting mode. When the state of the four-way valve 2 is -1, the D port of the four-way valve 2 is connected to the C port, and the E port is connected to the S port. At this time, the operation mode of the air conditioning system is the heating mode.

[0129] In some exemplary embodiments, the air conditioning system includes: an indoor heat exchanger 5, a throttling component 4, and an outdoor heat exchanger 3 connected in series through a pipeline, a first bypass branch 61 that can be switched on and off, and a second bypass branch 62 that can be switched on and off. The first bypass branch 61 is connected in parallel with the indoor heat exchanger 5 and the throttling component 4, and the second bypass branch 62 is connected in parallel with the outdoor heat exchanger 3 and the throttling component 4. In the absence of blockage, the first bypass branch 61 and the second bypass branch 62 are both closed.

[0130] The blockage solving operation is performed, including: opening the first bypass branch 61 or the second bypass branch 62 according to the operation mode of the air-conditioning system.

[0131] The first bypass branch 61 may be provided with a first valve 611, and the on-off of the first bypass branch 61 is controlled by controlling the opening and closing of the first valve 611. The second bypass branch 62 may be provided with a second valve 621, and the on-off of the second bypass branch 62 is controlled by controlling the opening and closing of the second valve 621.

[0132] Of course, the method of performing the congestion resolution operation is not limited to this method, and the congestion may also be resolved through other operations.

[0133] In some embodiments, the first bypass branch 61 or the second bypass branch 62 is turned on according to the operation mode of the air conditioning system, including:

[0134] Based on the air conditioning system being in the cooling mode or the defrosting mode, the second bypass branch 62 is turned on;

[0135] Based on the air conditioning system being in the heating mode, the first bypass branch 61 is opened.

[0136] like Figure 2 As shown, when the air conditioning system is in cooling mode or defrosting mode, the risk of blockage at the outlet (i.e., the first port 41) of the throttling component 4 is high. Therefore, the second bypass branch 62 is turned on so that a small amount of high-temperature gas discharged from the compressor 1 can directly reach the first port 41 of the throttling component 4 through the second bypass branch 62. In this way, on the one hand, the temperature of the fluid discharged from the first port 41 of the throttling component 4 can be increased to reduce the viscosity of the lubricating oil, and the solubility of the lubricating oil in the refrigerant can be increased, thereby solving the blockage phenomenon; on the other hand, a small amount of gas discharged from the compressor 1 can directly enter the compressor 1 after being cooled by the indoor heat exchanger 5, thereby avoiding insufficient system circulation flow due to blockage of the throttling component 4.

[0137] like Figure 3 As shown, when the air conditioning system is in heating mode, the risk of blockage at the outlet (i.e., the second port 42) of the throttling component 4 is high. Therefore, the first bypass branch 61 is turned on so that a small amount of high-temperature gas discharged from the compressor 1 can directly reach the second port 42 of the throttling component 4 through the first bypass branch 61. In this way, on the one hand, the temperature of the fluid discharged from the second port 42 of the throttling component 4 can be increased to reduce the viscosity of the lubricating oil, and the solubility of the lubricating oil in the refrigerant can be increased, thereby solving the blockage phenomenon; on the other hand, a small amount of gas discharged from the compressor 1 can directly enter the compressor 1 after being cooled by the outdoor heat exchanger 3, thereby avoiding insufficient system circulation flow due to blockage of the throttling component 4.

[0138] In this way, the high-temperature exhaust gas of the compressor 1 can be used to solve the blockage problem of the throttling component 4. The blockage phenomenon can be dealt with while no additional heating components are required, which is conducive to ensuring the long-term and effective normal operation of the system and is suitable for various working conditions and models.

[0139] In some exemplary embodiments, the performed blocking resolution operation further includes:

[0140] After the preset conduction time t0, the first bypass branch 61 or the second bypass branch 62 is closed, and step S304 is executed.

[0141] In the refrigeration mode / defrost mode, the second bypass branch 62 is closed after being turned on for a preset time t0 to prevent excessive refrigerant flowing through the second bypass branch 62 from causing the system low pressure to increase and causing other abnormalities in the system.

[0142] In the heating mode, the first bypass branch 61 is closed after being turned on for a preset turn-on time t0 in order to prevent excessive refrigerant flowing through the first bypass branch 61 from causing the system low pressure to increase and causing other abnormalities in the system.

[0143] In some exemplary embodiments, the preset on-time duration t0 is greater than 5 s and less than 10 s.

[0144] If t0 is too small, the outlet temperature of the throttling component 4 will not rise significantly; if t0 is too large, the exhaust bypass will be too much, resulting in an increase in the system low pressure and other abnormalities in the system. Therefore, it is very important to reasonably set the preset conduction time.

[0145] Of course, the size of t0 is not limited to the above range and can be adjusted as needed.

[0146] In some exemplary embodiments, determining that a blockage occurs in the air conditioning system includes:

[0147] According to any one of the blockage detection methods in the above embodiments, it is determined that the air conditioning system is blocked.

[0148] Of course, it is also possible to determine that the air conditioning system is blocked based on other blockage detection methods.

[0149] An embodiment of the present application also provides a control device, including a processor and a memory storing a computer program. When the processor executes the computer program, it implements the steps of any congestion detection method in the above embodiments or the steps of any congestion processing method in the above embodiments, thereby having all the above-mentioned beneficial effects, which will not be repeated here.

[0150] The processor may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0151] like Figures 1 to 3 As shown, an embodiment of the present application further provides an air conditioning system, including: a refrigerant circuit, a first bypass branch 61 and a second bypass branch 62 .

[0152] The refrigerant circuit includes an indoor heat exchanger 5, a throttling component 4 and an outdoor heat exchanger 3 which are connected in series through pipelines.

[0153] One end of the first bypass branch 61 is communicated with an end of the indoor heat exchanger 5 away from the throttling component 4, and the other end of the first bypass branch 61 is communicated with an end of the throttling component 4 close to the outdoor heat exchanger 3, so that the first bypass branch 61 is connected in parallel with the indoor heat exchanger 5 and the throttling component 4. The first bypass branch 61 is provided with a first valve 611, and the first valve 611 is configured to control the on-off of the first bypass branch 61.

[0154] One end of the second bypass branch 62 is communicated with an end of the outdoor heat exchanger 3 away from the throttling component 4, and the other end of the second bypass branch 62 is communicated with an end of the throttling component 4 close to the indoor heat exchanger 5, so that the second bypass branch 62 is connected in parallel with the outdoor heat exchanger 3 and the throttling component 4. The second bypass branch 62 is provided with a second valve 621, and the second valve 621 is configured to control the on-off of the second bypass branch 62.

[0155] As mentioned above, Figure 2 As shown, when the air conditioning system is in cooling mode or defrosting mode, the risk of blockage at the outlet (i.e., the first port 41) of the throttling component 4 is high. Therefore, the second bypass branch 62 is turned on so that a small amount of high-temperature gas discharged from the compressor 1 can directly reach the first port 41 of the throttling component 4 through the second bypass branch 62. In this way, on the one hand, the temperature of the fluid discharged from the first port 41 of the throttling component 4 can be increased to reduce the viscosity of the lubricating oil, and the solubility of the lubricating oil in the refrigerant can be increased, thereby solving the blockage phenomenon; on the other hand, a small amount of gas discharged from the compressor 1 can directly enter the compressor 1 after being cooled by the indoor heat exchanger 5, thereby avoiding insufficient system circulation flow due to blockage of the throttling component 4.

[0156] like Figure 3 As shown, when the air conditioning system is in heating mode, the risk of blockage at the outlet (i.e., the second port 42) of the throttling component 4 is high. Therefore, the first bypass branch 61 is turned on so that a small amount of high-temperature gas discharged from the compressor 1 can directly reach the second port 42 of the throttling component 4 through the first bypass branch 61. In this way, on the one hand, the temperature of the fluid discharged from the second port 42 of the throttling component 4 can be increased to reduce the viscosity of the lubricating oil, and the solubility of the lubricating oil in the refrigerant can be increased, thereby solving the blockage phenomenon; on the other hand, a small amount of gas discharged from the compressor 1 can directly enter the compressor 1 after being cooled by the outdoor heat exchanger 3, thereby avoiding insufficient system circulation flow due to blockage of the throttling component 4.

[0157] In this way, the high-temperature exhaust gas of the compressor 1 can be used to solve the blockage problem of the throttling component 4. The blockage phenomenon can be dealt with while no additional heating components are required, which is conducive to ensuring the long-term and effective normal operation of the system and is suitable for various working conditions and models.

[0158] In some exemplary embodiments, the air conditioning system further includes a control device as in the above embodiment, and the control device is electrically connected to the first valve 611 and the second valve 621. The control device controls the on-off of the first bypass branch 61 by controlling the opening and closing of the first valve 611, and controls the on-off of the second bypass branch 62 by controlling the opening and closing of the second valve 621.

[0159] In some exemplary embodiments, Figure 1 As shown, the air conditioning system further includes: a first temperature sensor 71 and a first pressure sensor 81, which are arranged at the first port 41 of the throttling component 4 close to the indoor heat exchanger 5. The first temperature sensor 71 is configured to detect the fluid temperature at the first port 41 (i.e., the outlet temperature of the throttling component 4 in the cooling mode / defrosting mode), and the first pressure sensor 81 is configured to detect the fluid pressure at the first port 41 (i.e., the outlet pressure of the throttling component 4 in the cooling mode / defrosting mode, and the outlet pressure may be an outlet gauge pressure).

[0160] like Figure 1 As shown, the air conditioning system further includes: a second temperature sensor 72 and a second pressure sensor 82, which are arranged at the second port 42 of the throttling component 4 close to the outdoor heat exchanger 3. The second temperature sensor 72 is arranged to detect the fluid temperature at the second port 42 (i.e., the outlet temperature of the throttling component 4 in the heating mode), and the second pressure sensor 82 is arranged to detect the fluid pressure at the second port 42 (i.e., the outlet pressure of the throttling component 4 in the heating mode, and the outlet pressure may be the outlet gauge pressure).

[0161] The control device is also electrically connected to the first temperature sensor 71, the first pressure sensor 81, the second temperature sensor 72, and the second pressure sensor 82 to obtain the outlet temperature and outlet pressure of the throttling component 4 under different operating modes.

[0162] The air conditioning system also includes (not shown in the figure): a third temperature sensor for detecting the indoor ambient temperature, a fourth temperature sensor for detecting the temperature of the indoor heat exchanger 5, a fifth temperature sensor for detecting the outdoor ambient temperature, and a sixth temperature sensor for detecting the temperature of the outdoor heat exchanger 3.

[0163] The fourth temperature sensor can specifically detect the middle temperature of the indoor heat exchanger 5. The sixth temperature sensor can specifically detect the outlet temperature of the outdoor heat exchanger 3.

[0164] The control device is also electrically connected to the third temperature sensor, the fourth temperature sensor, the fifth temperature sensor, and the sixth temperature sensor to obtain the indoor ambient temperature, the temperature of the indoor heat exchanger 5 , the outdoor ambient temperature, and the temperature of the outdoor heat exchanger 3 .

[0165] The air conditioning system further includes: a current detection element for detecting the whole machine current value or a power detection element for detecting the whole machine power value. The control device is electrically connected to the current detection element or the power detection element to obtain the whole machine current value or the whole machine power value.

[0166] In the embodiment of the present application, the air-conditioning system may be an R290 air-conditioning system or an air-conditioning system using other refrigerants.

[0167] In one embodiment, the process of the blockage detection method of the air conditioning system is as follows: Figure 5 As shown, the principle is as follows:

[0168] First, the blockage of the throttling component 4 is detected, and the specific steps include the following:

[0169] 1) Determine the current operation mode of the air conditioning system: determine whether the air conditioner is in cooling / defrosting mode or heating mode according to the state of the four-way valve 2. When the state of the four-way valve 2 is 0, the air conditioner is in cooling / defrosting mode, and detects the outdoor ambient temperature T4, the whole machine current value I, the pressure P of the first port 41 of the throttling component 4, and the temperature T of the first port 41 of the throttling component 4; when the state of the four-way valve 2 is -1, the air conditioner is in heating mode, and detects the outdoor ambient temperature T4, the whole machine current value I, the pressure P of the second port 42 of the throttling component 4, and the temperature T of the second port 42 of the throttling component 4.

[0170] 2) Determine the preset value of the whole machine power and the preset value of the whole machine current Is according to the outdoor ambient temperature T4. If the whole machine current value I is detected to be less than the preset value I0×β, it is determined that the throttling component 4 may be blocked, and the next step of detection is entered; otherwise (the whole machine current value I is detected to be greater than or equal to the preset value I0×β), return to step 1). β can be 0.7.

[0171] 3) When the state of the four-way valve 2 is 0, the air conditioner is in the cooling / defrosting mode, and the pressure P behind the throttle valve is detected. If the gauge pressure P of the first port 41 of the throttle component 4 is less than 0, it is determined that the throttle component 4 may be blocked, and the next step of detection is performed; otherwise, the process returns to step 1); When the state of the four-way valve 2 is -1, the air conditioner is in the heating mode, and the gauge pressure P of the second port 42 of the throttle component 4 is detected. If the gauge pressure P is less than 0, it is determined that the throttle component 4 may be blocked, and the next step of detection is performed; otherwise, the process returns to step 1);

[0172] 4) When the state of the four-way valve 2 is 0, the air conditioner is in the cooling / defrosting mode, and the temperature T of the first port 41 of the throttling component 4 is detected. If the temperature T after the throttling valve is less than the critical temperature Ts, it is determined that the throttling component 4 is blocked in the system, otherwise, it returns to step 1); when the state of the four-way valve 2 is -1, the air conditioner is in the heating mode, and the temperature T before the throttling valve is detected. If the temperature T of the second port 42 of the throttling component 4 is less than the critical temperature Ts, it is determined that the throttling component 4 is blocked in the system, otherwise, it returns to step 1). It is recommended that Ts be the pour point temperature of the lubricating oil, such as for PAG oil (abbreviation of Polyalkylene Glycol, which is also a synthetic poly (ethylene) glycol lubricating oil), Ts is -40°C.

[0173] 5) Detect the indoor ambient temperature T1 and the outdoor ambient temperature T4. If the difference between the middle temperature T2 of the indoor heat exchanger 5 and the indoor ambient temperature T1 is less than ΔT1 and the difference between the outlet temperature T3 of the outdoor heat exchanger 3 and the outdoor ambient temperature T4 is less than ΔT1, it is determined that the throttling component 4 is blocked in the system. Otherwise, return to step 1). Both ΔT1 and ΔT2 can be 1°C.

[0174] Wherein, the above-mentioned throttling component 4 blockage detection logic shortens the detection cycle when the outdoor ambient temperature T4 is lower than a preset temperature (such as 2°C);

[0175] The above-mentioned throttling component 4 blockage detection logic shortens the detection period when the four-way valve 2 is switched. When the system is judged to be in low-temperature heating defrosting or reheating according to the outdoor ambient temperature and the switching of the four-way valve 2, the detection period can be shortened to a preset minimum duration, such as 5s.

[0176] When it is detected that the system is not blocked, the first valve 611 and the second valve 621 are both closed.

[0177] The process of treating blockage of air conditioning system is as follows: Figure 7 As shown, the principle is as follows:

[0178] When the throttling component 4 is detected to be blocked in the system, the specific implementation scheme is as follows:

[0179] 1) Determine the current operation mode of the air conditioning system: determine whether the air conditioner is in cooling / defrosting mode or heating mode based on the state of the four-way valve 2. When the state of the four-way valve 2 is 0, the air conditioner is in cooling / defrosting mode; when the state of the four-way valve 2 is -1, the air conditioner is in heating mode.

[0180] 2) Adjust the switches of the first valve 611 and the second valve 621 according to the cooling / defrosting mode or the heating mode: when the state of the four-way valve 2 is 0, that is, the cooling / defrosting mode, open the second valve 621 (close the second valve 621 after the preset conduction time t0), keep the first valve 611 closed, and guide the exhaust high-temperature gas into the downstream of the throttling component 4 to reach the first port 41 of the throttling component 4. On the one hand, the fluid temperature downstream of the throttling component 4 is increased to reduce the viscosity of the lubricating oil; on the other hand, a small amount of gas discharged from the compressor 1 is directly cooled by the indoor heat exchanger 5 and then enters the compressor 1, avoiding insufficient circulation flow due to blockage of the throttling component 4. When the state of the four-way valve 2 is -1, that is, the heating mode, the first valve 611 is opened (the first valve 611 is closed after the preset conduction time t0), and the second valve 621 is kept closed to guide the exhaust high-temperature gas downstream of the throttling component 4 to the second port 42 of the throttling component 4. On the one hand, the fluid temperature downstream of the throttling component 4 is increased to reduce the viscosity of the lubricating oil. On the other hand, a small amount of gas discharged from the compressor 1 is directly cooled by the outdoor heat exchanger 3 and enters the compressor 1 to avoid insufficient circulation flow due to blockage of the throttling component 4.

[0181] 3) Check whether the system has resumed normal operation (i.e., whether the blockage has been resolved): When the state of the four-way valve 2 is 0, i.e., the refrigeration / defrosting mode, detect the outdoor ambient temperature T4, the whole machine current value I, the pressure P of the first port 41 of the throttling component 4, and the temperature T of the first port 41 of the throttling component 4. If it is detected that the whole machine current value I is greater than or equal to (or greater than) the preset value I0×α, and the gauge pressure P of the first port 41 of the throttling component 4 is greater than 0, and the temperature T of the first port 41 of the throttling component 4 is greater than the preset value Ts, and the temperature difference between the indoor heat exchanger 5 and the indoor environment is greater than △T3, and the temperature difference between the outdoor heat exchanger 3 and the outdoor environment is greater than △T4, then it is considered that the system has resumed normal (i.e., the blockage has been resolved), otherwise it is determined that the system is still abnormal and enters the next throttling component 4 blockage processing flow. When the state of the four-way valve 2 is -1, that is, the heating mode, the outdoor ambient temperature T4, the whole machine current value I, the pressure P of the second port 42 of the throttling component 4, and the temperature T of the second port 42 of the throttling component 4 are detected. If it is detected that the whole machine current value I is greater than the preset value I0×α, and the gauge pressure P of the second port 42 of the throttling component 4 is greater than 0, and the temperature T of the second port 42 of the throttling component 4 is greater than the preset value Ts, and the temperature difference between the indoor heat exchanger 5 and the indoor environment is greater than △T3 and the temperature difference between the outdoor heat exchanger 3 and the outdoor environment is greater than △T4, then it is considered that the system has returned to normal, otherwise it is determined that the system is still abnormal and enters the next throttling component 4 blockage processing flow.

[0182] 4) The above t0 value should not be too small or too large. If it is too small, the temperature after the throttle valve will not rise significantly. If it is too large, it will cause excessive exhaust bypass, increase the system low pressure, and cause other abnormalities in the system. It is recommended that t0 be greater than 5s and less than 10s.

[0183] An embodiment of the present application also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements a congestion detection method or a congestion processing method as described in any one of the above embodiments, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0184] To sum up, the blockage detection method, blockage handling method, control device and air-conditioning system provided in the embodiments of the present application can use the operating parameters of the air-conditioning system to detect whether the throttling component is blocked, and use the high-temperature exhaust gas of the compressor to solve the blockage problem of the throttling component. It improves the accuracy and effectiveness of blockage detection and blockage handling of the throttling component without the need for additional heating components, which is conducive to ensuring the long-term and effective normal operation of the system, and has simple logic, easy implementation, and is suitable for various working conditions and models.

[0185] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0186] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0187] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0188] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0189] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0190] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0191] In any one or more of the above exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on a computer-readable medium or transmitted via a computer-readable medium as one or more instructions or codes, and executed by a hardware-based processing unit. A computer-readable medium may include a computer-readable storage medium corresponding to a tangible medium such as a data storage medium, or a communication medium that facilitates a computer program, such as any medium transmitted from one place to another according to a communication protocol. In this way, a computer-readable medium may generally correspond to a non-temporary tangible computer-readable storage medium or a communication medium such as a signal or carrier wave. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the technology described in the present disclosure. A computer program product may include a computer-readable medium.

[0192] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Moreover, any connection may also be referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio and microwave are included in the definition of medium. However, it should be understood that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transient (transient) media, but are directed to non-transient tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), floppy disks, or Blu-ray disks, etc., where disks typically reproduce data magnetically, while optical disks use lasers to reproduce data optically. Combinations of the above should also be included within the scope of computer-readable media.

[0193] For example, instructions may be executed by one or more processors such as one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Thus, the term "processor" as used herein may refer to any of the above structures or any other structures suitable for implementing the techniques described herein. Additionally, in some aspects, the functionality described herein may be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Also, the techniques may be fully implemented in one or more circuits or logic elements.

[0194] The technical solutions of the embodiments of the present disclosure can be implemented in a wide variety of devices or equipment, including wireless mobile phones, integrated circuits (ICs) or a group of ICs (e.g., chipsets). Various components, modules or units are described in the embodiments of the present disclosure to emphasize the functional aspects of the devices configured to perform the described techniques, but they do not necessarily need to be implemented by different hardware units. Instead, as described above, the various units can be combined in a codec hardware unit or provided by a collection of interoperable hardware units (including one or more processors as described above) in combination with suitable software and / or firmware.

Claims

1. A blockage detection method for an air conditioning system, characterized in that: The blockage detection method comprises: Acquiring temperature parameters, pressure parameters and power parameters of the air conditioning system, and determining whether the air conditioning system is blocked according to the temperature parameters, pressure parameters and power parameters of the air conditioning system; Based on the temperature parameter satisfying a first preset condition, the pressure parameter satisfying a second preset condition, and the power parameter satisfying a third preset condition, it is determined that the air conditioning system is blocked.

2. The blockage detection method according to claim 1, characterized in that: The temperature parameters include: indoor ambient temperature, indoor heat exchanger temperature, outdoor heat exchanger temperature, outdoor ambient temperature, and outlet temperature of the throttling component; The first preset condition includes: the outlet temperature of the throttling component is lower than the pour point temperature of the lubricating oil, the absolute value of the difference between the indoor heat exchanger temperature and the indoor ambient temperature is lower than the first preset difference, and the absolute value of the difference between the outdoor heat exchanger temperature and the outdoor ambient temperature is lower than the second preset difference.

3. The blockage detection method according to claim 2, characterized in that: The first preset difference is in the range of 1°C to 2°C; and / or The second preset difference is in the range of 1°C to 2°C.

4. The blockage detection method according to any one of claims 1 to 3, characterized in that: The pressure parameters include: the outlet gauge pressure P of the throttling component; The second preset condition includes: the outlet gauge pressure P of the throttling component is less than 0.

5. The blockage detection method according to any one of claims 1 to 3, characterized in that: The power parameter includes: the whole machine current value; the third preset condition includes: the whole machine current value is less than β times of the whole machine current preset value corresponding to the current outdoor ambient temperature, 0<β≤1; or The power parameter includes: the whole machine power value; the third preset condition includes: the whole machine power value is less than β times the whole machine power preset value corresponding to the current outdoor ambient temperature, 0<β≤1.

6. The blockage detection method according to claim 5, characterized in that: 0＜β≤0.7。 7. The blockage detection method according to any one of claims 1 to 3, characterized in that: Also includes: An operating mode of the air-conditioning system is determined, and the step of obtaining the temperature parameter, pressure parameter and power parameter of the air-conditioning system is performed according to the determined operating mode.

8. The blockage detection method according to any one of claims 1 to 3, characterized in that: Also includes: The steps of obtaining the temperature parameters, pressure parameters and power parameters of the air-conditioning system and determining whether the air-conditioning system is blocked are repeated at intervals of a preset time.

9. The blockage detection method according to claim 8, characterized in that: Also includes: Based on the outdoor environment temperature T4 being lower than the preset temperature, shortening the preset time; and / or The preset time duration is shortened based on switching the refrigerant flow direction of the air conditioning system.

10. A blockage treatment method for an air conditioning system, characterized in that: The blockage treatment method comprises: Based on determining that the air conditioning system is blocked, performing a blockage resolution operation; Acquiring temperature parameters, pressure parameters and power parameters of the air conditioning system, and judging whether the blockage of the air conditioning system is resolved according to the temperature parameters, pressure parameters and power parameters of the air conditioning system; Based on the fact that the temperature parameter satisfies the fourth preset condition, the pressure parameter satisfies the fifth preset condition, and the power parameter satisfies the sixth preset condition, it is determined that the blockage of the air-conditioning system has been resolved.

11. The blockage treatment method according to claim 10, characterized in that: The temperature parameters include: indoor ambient temperature, indoor heat exchanger temperature, outdoor heat exchanger temperature, outdoor ambient temperature, and outlet temperature of the throttling component; The fourth preset condition includes: the outlet temperature of the throttling component is greater than or equal to the pour point temperature of the lubricating oil, the absolute value of the difference between the indoor heat exchanger temperature and the indoor ambient temperature is greater than or equal to the third preset difference, and the absolute value of the difference between the outdoor heat exchanger temperature and the outdoor ambient temperature is greater than or equal to the fourth preset difference.

12. The blockage treatment method according to claim 10 or 11, characterized in that: The pressure parameters include: the outlet gauge pressure of the throttling component; The fifth preset condition includes: the outlet gauge pressure of the throttling component is greater than or equal to 0.

13. The blockage treatment method according to claim 10 or 11, characterized in that: The power parameter includes: the whole machine current value; the sixth preset condition includes: the whole machine current value is greater than or equal to α times the whole machine current preset value corresponding to the current outdoor ambient temperature; or The power parameter includes: the whole machine power value; the sixth preset condition includes: the whole machine power value is greater than or equal to α times the whole machine power preset value corresponding to the current outdoor ambient temperature.

14. The blockage treatment method according to claim 10 or 11, characterized in that: Also includes: An operating mode of the air-conditioning system is determined, and the step of obtaining the temperature parameter, pressure parameter and power parameter of the air-conditioning system is performed according to the determined operating mode.

15. The blockage treatment method according to claim 10 or 11, characterized in that: The air conditioning system comprises: an indoor heat exchanger, a throttling component and an outdoor heat exchanger connected in series through pipelines, a first bypass branch that can be switched on and off, and a second bypass branch that can be switched on and off; the first bypass branch is connected in parallel with the indoor heat exchanger and the throttling component, and the second bypass branch is connected in parallel with the outdoor heat exchanger and the throttling component; The performing the congestion resolution operation includes: opening the first bypass branch or the second bypass branch according to an operation mode of the air conditioning system.

16. The blockage treatment method according to claim 15, characterized in that: The step of opening the first bypass branch or the second bypass branch according to the operation mode of the air conditioning system comprises: Based on the air conditioning system being in a cooling mode or a defrosting mode, opening the second bypass branch; Based on the air conditioning system being in a heating mode, the first bypass branch is opened.

17. The blockage treatment method according to claim 15, characterized in that: The congestion resolution operations performed also include: After a preset conduction time, the first bypass branch or the second bypass branch that is turned on is closed, and the steps of obtaining the temperature parameters, pressure parameters and power parameters of the air-conditioning system and determining whether the blockage of the air-conditioning system has been resolved are performed based on the temperature parameters, pressure parameters and power parameters of the air-conditioning system.

18. The blockage treatment method according to claim 10, characterized in that: The determining that the air conditioning system is blocked includes: According to the blockage detection method according to any one of claims 1 to 9, it is determined that the air conditioning system is blocked.

19. A control device, characterized in that: The invention comprises a processor and a memory storing a computer program, wherein when the processor executes the computer program, the steps of the congestion detection method according to any one of claims 1 to 9 or the steps of the congestion processing method according to any one of claims 10 to 18 are implemented.

20. An air conditioning system, characterized in that: include: A refrigerant circuit, including an indoor heat exchanger, a throttling component and an outdoor heat exchanger connected in series through pipes; A first bypass branch, one end of which is connected to an end of the indoor heat exchanger away from the throttling component, and the other end of which is connected to an end of the throttling component close to the outdoor heat exchanger, so that the first bypass branch is connected in parallel with the indoor heat exchanger and the throttling component, and the first bypass branch is provided with a first valve; a second bypass branch, one end of which is connected to an end of the outdoor heat exchanger away from the throttling component, and the other end of which is connected to an end of the throttling component close to the indoor heat exchanger, so that the second bypass branch is connected in parallel with the outdoor heat exchanger and the throttling component, and the second bypass branch is provided with a second valve; and The control device as claimed in claim 19, electrically connected to the first valve and the second valve.

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