Air conditioning system, method and device for unblocking an oil blockage, electronic device and storage medium

Abstract

The application provides an air conditioning system, an oil blockage dredging method and device, electronic equipment and a storage medium, and the air conditioning system comprises an indoor evaporator, an electronic expansion valve, an outdoor condenser, an electromagnetic control valve, a compressor and a control device; wherein: one end of the outdoor condenser is connected with the compressor, an inlet end of the electromagnetic control valve is connected with the compressor, and one end of the indoor evaporator is connected with the compressor; the other end of the outdoor condenser is connected with the other end of the indoor evaporator through the electronic expansion valve, and the outlet end of the electromagnetic control valve is connected with the other end of the indoor evaporator through the electronic expansion valve; the control device is used for opening the electromagnetic control valve when the electronic expansion valve is blocked by oil; the refrigerant output by the compressor enters the outdoor condenser and the electromagnetic control valve respectively, and enters the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively. Through the application, the blockage of the electronic expansion valve can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning systems, and in particular to an air conditioning system, a method for unblocking an oil block, an unblocking device for an oil block, an electronic device and a computer readable storage medium. BACKGROUND

[0002] R290 (propane), as a natural refrigerant with a GWP (Global Warming Potential) of 3, has a high efficiency in room air conditioners due to its good thermophysical properties.

[0003] With the gradual elimination of high ODP (Ozone Depletion Potential) or high GWP refrigerants such as HCFCs (hydrochlorofluorocarbons) and HFCs (hydrofluorocarbons), R290 has been gradually applied as a replacement refrigerant in air conditioners.

[0004] However, the prior art shows that the viscosity of ordinary mineral lubricating oil increases sharply at low temperatures, especially in cold and warm variable frequency machines; when entering the defrosting mode, the ultra-low temperature refrigerant and lubricating oil in the heat exchanger need to pass through the electronic expansion valve into the heat exchanger when the four-way valve reverses. However, for R290 refrigerant, due to safety considerations, the charge of R290 refrigerant is less, and the required charge of R290 refrigerant is much less than that of R32 (difluoromethane), R143A (trifluoroethane) and other refrigerants under the same capacity and energy efficiency, and the proportion of compressor oil in the system is larger, so the system pressure is also smaller, and when the outer ring temperature is low, it is easy to cause the lubricating oil with relatively large viscosity to block the normal opening of the electronic expansion valve, resulting in that the R290 refrigerant cannot participate in the circulation, and further causing the compressor to idle, the capacity and power to decrease, and the system to lack oil and fluorine; after a long time of operation, the motor of the compressor overheats, which not only affects the user's experience, but also greatly reduces the service life of the compressor and the system. SUMMARY

[0005] In view of the above problems, an air conditioning system, a method for unblocking an oil block, an unblocking device for an oil block, an electronic device and a computer readable storage medium are provided to overcome the above problems or at least partially solve the above problems, comprising:

[0006] An air conditioning system, comprising: an indoor evaporator, an electronic expansion valve, an outdoor condenser, an electromagnetic control valve, a compressor and a control device; wherein:

[0007] One end of the outdoor condenser is connected to the compressor, the inlet end of the electromagnetic control valve is connected to the compressor, and one end of the indoor evaporator is connected to the compressor.

[0008] the other end of the outdoor condenser is connected with the other end of the indoor evaporator through the electronic expansion valve, and the outlet end of the electromagnetic control valve is connected with the other end of the indoor evaporator through the electronic expansion valve;

[0009] the control device is configured to open the electromagnetic control valve when the electronic expansion valve is blocked by oil; the refrigerant output by the compressor enters the outdoor condenser and the electromagnetic control valve respectively, and enters the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

[0010] Optionally, the control device is configured to determine whether the electronic expansion valve is blocked by oil according to a current first outdoor temperature and a current first pressure value of the outlet end of the electronic expansion valve.

[0011] Optionally, the control device is configured to determine whether the first outdoor temperature is lower than a first preset temperature value and whether the first pressure value is lower than a first preset pressure value; when the first outdoor temperature is lower than the first preset temperature value and the first pressure value is lower than the first preset pressure value, it is determined that the electronic expansion valve is blocked by oil.

[0012] Optionally, the control device is further configured to, after the electromagnetic control valve is opened for a first preset time length, determine that the oil blockage of the electronic expansion valve is unblocked when a current second outdoor temperature is not lower than the first preset temperature value and / or a current second pressure value of the outlet end of the electronic expansion valve is not lower than a second preset pressure value.

[0013] Optionally, the control device is further configured to determine that the oil blockage of the electronic expansion valve is not unblocked when the current second outdoor temperature is lower than the first preset temperature value and the current second pressure value of the outlet end of the electronic expansion valve is lower than the second preset pressure value; when it is determined that the oil blockage of the electronic expansion valve is not unblocked, the electronic expansion valve is fully opened, and after a second preset time length, it is determined that the oil blockage of the electronic expansion valve is unblocked when an absolute value of a pressure difference between the inlet end of the electronic expansion valve and the outlet end of the electronic expansion valve is lower than a third preset pressure value.

[0014] Optionally, the control device is further configured to determine that the electronic expansion valve has a fault when the absolute value of the pressure difference is not lower than the third preset pressure value; and a fault prompt is given for the electronic expansion valve.

[0015] Optionally, the air conditioning system further comprises:

[0016] an outdoor fan configured to adjust the temperature of the outdoor condenser.

[0017] Optionally, the air conditioning system further comprises:

[0018] a first pressure sensor configured to detect a pressure at an end of the electronic expansion valve away from the indoor evaporator;

[0019] a second pressure sensor configured to detect a pressure at an end of the electronic expansion valve close to the indoor evaporator.

[0020] Optionally, the air conditioning system further comprises:

[0021] a four-way valve configured to connect the compressor to the indoor evaporator and the compressor to the outdoor condenser.

[0022] The embodiment of the present application further provides a method for dredging an oil blockage, applied to the air conditioning system, and the method comprises the following steps:

[0023] determining whether the electronic expansion valve is blocked by oil according to a current first outdoor temperature and a current first pressure value at an outlet end of the electronic expansion valve;

[0024] when the electronic expansion valve is blocked by oil, opening an electromagnetic control valve to control refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve respectively, and to enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

[0025] The embodiment of the present application further provides a device for dredging an oil blockage, applied to the air conditioning system, and the device comprises:

[0026] a determining module configured to determine whether the electronic expansion valve is blocked by oil according to a current first outdoor temperature and a current first pressure value at an outlet end of the electronic expansion valve;

[0027] a dredging module configured to, when the electronic expansion valve is blocked by oil, open an electromagnetic control valve to control refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve respectively, and to enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

[0028] The embodiment of the present application further provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and capable of running on the processor, and when the computer program is executed by the processor, the oil blockage dredging method is realized.

[0029] The embodiment of the present application further provides a computer readable storage medium, and the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the oil blockage dredging method is realized.

[0030] The embodiment of the present application has the following advantages:

[0031] In the embodiment of the present application, the air conditioning system comprises: an indoor evaporator, an electronic expansion valve, an outdoor condenser, an electromagnetic control valve, a compressor and a control device; wherein: one end of the outdoor condenser is connected with the compressor, the inlet end of the electromagnetic control valve is connected with the compressor, and one end of the indoor evaporator is connected with the compressor; the other end of the outdoor condenser is connected with the other end of the indoor evaporator through the electronic expansion valve, and the outlet end of the electromagnetic control valve is connected with the other end of the indoor evaporator through the electronic expansion valve; the control device is used for opening the electromagnetic control valve when the electronic expansion valve is blocked by oil; the refrigerant output by the compressor enters the outdoor condenser and the electromagnetic control valve respectively, and enters the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively. Through the embodiment of the present application, the problems of compressor idling, capacity and power reduction, oil shortage and the like of the air conditioning system caused by the blockage of the electronic expansion valve can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a structural schematic diagram of an air conditioning system according to an embodiment of the present application;

[0034] Figure 2 is a structural schematic diagram of another air conditioning system according to an embodiment of the present application;

[0035] Figure 3 is a structural schematic diagram of another air conditioning system according to an embodiment of the present application;

[0036] Figure 4 is a step flow chart of a method for dredging oil blockage according to an embodiment of the present application;

[0037] Figure 5 is a step flow chart of a method for dredging oil blockage of an electronic expansion valve according to an embodiment of the present application;

[0038] Figure 6 is a structural schematic diagram of a dredging device for oil blockage according to an embodiment of the present application.

[0039] Brief Description of the Drawings:

[0040] Air conditioning system 10, indoor evaporator 101, electronic expansion valve 102, outdoor condenser 103, electromagnetic control valve 104, compressor 105, control device 106, first pressure sensor 107, second pressure sensor 108, outdoor fan 109, four-way valve 110. DETAILED DESCRIPTION

[0041] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0042] In order to avoid the problems of compressor idling, capacity and power reduction, oil shortage and the like of the air conditioning system caused by the blockage of the electronic expansion valve, the present embodiment provides an air conditioning system, which additionally provides an electromagnetic control valve connected with the compressor and the electronic expansion valve, so as to transmit the high-temperature and high-pressure refrigerant output by the compressor to the electronic expansion valve through a shorter link to dredge the oil blockage. Specifically, reference can be made to Figure 1 , Figure 1 A structural schematic diagram of an air conditioning system according to an embodiment of the present application is shown.

[0043] As shown in Figure 1 , the air conditioning system 10 can include an indoor evaporator 110, an electronic expansion valve 120, an outdoor condenser 130, an electromagnetic control valve 140, a compressor 150 and a control device 160; wherein:

[0044] One end of the outdoor condenser 103 is connected with the compressor 105, the inlet end of the electromagnetic control valve 104 is connected with the compressor 105, and one end of the indoor evaporator 101 is connected with the compressor 105;

[0045] The other end of the outdoor condenser 103 is connected with the other end of the indoor evaporator 101 through the electronic expansion valve 102, and the outlet end of the electromagnetic control valve 104 is connected with the other end of the indoor evaporator 101 through the electronic expansion valve 102;

[0046] The control device 106 is used for opening the electromagnetic control valve 104 when the oil blockage occurs in the electronic expansion valve 102; the refrigerant output by the compressor 105 enters the outdoor condenser 103 and the electromagnetic control valve 104 respectively, and enters the electronic expansion valve 102 through the outdoor condenser 103 and the electromagnetic control valve 104 respectively.

[0047] In the embodiments of the present application, the indoor evaporator 101 is a heat exchanger in the air conditioning system 10, responsible for absorbing heat from the indoor air in the cooling mode and defrosting mode, or releasing heat to the indoor air in the heating mode. In the cooling mode or defrosting mode, the refrigerant changes from liquid to gas in the indoor evaporator 101, absorbing heat from the surrounding air, thereby reducing the temperature of the indoor air. In the heating mode, the refrigerant changes from gas to liquid in the indoor evaporator 101, releasing heat to the surrounding air, thereby increasing the temperature of the indoor air.

[0048] The electronic expansion valve 102 is a key component for controlling the flow of refrigerant, used to regulate the flow of refrigerant from the high-pressure side to the low-pressure side. By precisely controlling the flow of refrigerant, the electronic expansion valve 102 ensures that the indoor evaporator 101 and the outdoor condenser 103 operate in an optimal state, improving the energy efficiency and stability of the system.

[0049] The outdoor condenser 103 is another heat exchanger in the air conditioning system 10, responsible for discharging heat absorbed by the refrigerant to the outdoor environment, or absorbing heat from the outdoor environment to the indoor air. Specifically, in the cooling mode or defrosting mode, the refrigerant becomes a high-temperature and high-pressure gas under the action of the compressor 105, which can enter the outdoor condenser 103 and release heat to the outdoor environment through heat exchange with the outdoor air, and the refrigerant changes from gas to liquid. This process is called condensation. In the heating mode, the refrigerant can absorb heat from the outdoor environment in the outdoor condenser 103, and the refrigerant can change from liquid to gas.

[0050] The compressor 105 is the heart of the air conditioning system 10, responsible for increasing the pressure and temperature of the refrigerant. Specifically, in the cooling mode or defrosting mode, the compressor 105 sucks in the low-pressure and low-temperature refrigerant gas that has absorbed heat in the indoor evaporator 101, and then through mechanical compression, it changes into a high-pressure and high-temperature gas, which is then sent to the outdoor condenser 103. In the heating mode, the compressor 105 sucks in the low-pressure and low-temperature refrigerant gas that has absorbed heat in the outdoor condenser 103, and then through mechanical compression, it changes into a high-pressure and high-temperature gas, which is then sent to the indoor evaporator 101.

[0051] The control device 106 can be used to control the operating state of the indoor evaporator 101, the opening degree of the electronic expansion valve 102, the operating state of the outdoor condenser 103, and the operating state of the compressor 105.

[0052] Specifically, in either cooling or defrosting mode, the control device 106 controls the indoor evaporator 101 to change the refrigerant flowing into it from a liquid to a gaseous state, absorbing heat from the surrounding air and thus lowering the indoor air temperature. In heating mode, the control device 106 controls the indoor evaporator 101 to change the refrigerant flowing into it from a gaseous to a liquid state, releasing heat to the surrounding air and thus raising the indoor air temperature.

[0053] The control device 106 can also regulate the refrigerant flow by controlling the opening of the electronic expansion valve 102, thereby ensuring that the indoor evaporator 101 and the outdoor condenser 103 operate in the best working condition and improving the system's energy efficiency and stability.

[0054] The control device 106 can also control the outdoor condenser 103 to release heat from the refrigerant to the outside in either cooling or defrosting mode, causing the refrigerant to change from a gaseous state to a liquid state. In heating mode, the control device 106 controls the outdoor condenser 103 to absorb heat from the outside into the refrigerant, causing the refrigerant to change from a liquid state to a gaseous state.

[0055] The control device 106 can also, in cooling mode or defrosting mode, control the compressor 105 to draw in the low-pressure, low-temperature refrigerant gas that has absorbed heat from the indoor evaporator 101, and then mechanically compress it into a high-pressure, high-temperature gas before sending it to the outdoor condenser 103. In heating mode, the control device 106 can also control the compressor 105 to draw in the low-pressure, low-temperature refrigerant gas that has absorbed heat from the outdoor condenser 103, and then mechanically compress it into a high-pressure, high-temperature gas before sending it to the indoor evaporator 101. This embodiment of the invention does not limit this process.

[0056] In practical applications, such as Figure 1 As shown, one end of the outdoor condenser 103 can be connected to the inlet and outlet of the compressor 105, and one end of the indoor evaporator 101 can be connected to the inlet and outlet of the compressor 105; the other end of the outdoor condenser 103 can be connected to the other end of the indoor evaporator 101 through the electronic expansion valve 102.

[0057] against Figure 1 In the structure of this system, during cooling or defrosting mode, the refrigerant output from compressor 105 first passes through outdoor condenser 103 to release heat to the outdoor environment; the refrigerant can change from gas to liquid in outdoor condenser 103. Then, it passes through indoor evaporator 101, vaporizing from liquid to gas. During this process, the refrigerant can absorb heat from the indoor environment, thereby lowering the indoor temperature. The vaporized refrigerant can then re-enter compressor 105 for compression.

[0058] In the heating mode, the refrigerant outputted by the compressor 105 can firstly pass through the indoor evaporator 101 to release heat to the indoor environment, so as to achieve the purpose of increasing the indoor temperature; at this time, the refrigerant is vaporized from liquid to gas. Then, the vaporized refrigerant can pass through the outdoor condenser 103 to change from gas to liquid, and after absorbing the heat of the outdoor environment, it returns to the compressor 105 for compression.

[0059] In actual application, the other end of the outdoor condenser 103 is connected with the other end of the indoor evaporator 101 through the electronic expansion valve 102; therefore, when the air conditioning system 10 is switched from the heating mode to the defrosting mode or the refrigeration mode, the low-temperature and liquid cooling liquid outputted by the outdoor condenser 103 will enter the indoor evaporator 101 through the electronic expansion valve 102. In this process, the low-temperature and liquid cooling liquid may be blocked in the electronic expansion valve 102, thereby affecting the operation of the air conditioning system 10.

[0060] In order to avoid that the electronic expansion valve 102 affects the operation of the air conditioning system 10 due to oil blocking, the air conditioning system 10 in the embodiment of the present application is additionally provided with a branch, which can directly deliver the high-temperature and high-pressure refrigerant outputted by the compressor 105 to the electronic expansion valve 102, so as to dredge the oil blocked electronic expansion valve 102 by the high-temperature and high-pressure refrigerant.

[0061] Specifically, the inlet end of the electromagnetic control valve 104 can be connected with the outlet end of the compressor 105, and the outlet end of the electromagnetic control valve 104 can be connected with the electronic expansion valve 102; thereby, when it is needed to dredge the electronic expansion valve 102, the control device 106 can control the electromagnetic control valve 104 to be opened, and the high-temperature and high-pressure refrigerant outputted by the compressor 105 can be outputted to the outdoor condenser 103 on one hand, and enter the electronic expansion valve 102 through the outdoor condenser 103; on the other hand, the high-temperature and high-pressure refrigerant outputted from the compressor 105 can also directly enter the electronic expansion valve 102 through the electromagnetic control valve 104. Compared with the coolant entering the electronic expansion valve 102 through the outdoor condenser 103, the refrigerant flowing through the electromagnetic control valve 104 has a shorter path, and does not pass through heat exchange and pressure reduction, so its temperature and pressure are higher, which can effectively dredge the oil blocked electronic expansion valve 102.

[0062] For example, the electromagnetic control valve 104 is in a closed state by default; when the control device 106 detects that the electronic expansion valve 102 is blocked by oil, the electromagnetic control valve 104 can be opened first; after the electromagnetic control valve 104 is opened, the high-temperature and high-pressure refrigerant output by the compressor 105 can enter the outdoor condenser 103 and the electromagnetic control valve 104 respectively; the refrigerant entering the outdoor condenser 103 and the electromagnetic control valve 104 respectively can enter the electronic expansion valve 102 through the outdoor condenser 103 and the electromagnetic control valve 104, so that the electronic expansion valve 102 is dredged.

[0063] In the embodiment of the present application, the air conditioning system 10 comprises: an indoor evaporator 101, an electronic expansion valve 102, an outdoor condenser 103, an electromagnetic control valve 104, a compressor 105 and a control device 106; wherein: one end of the outdoor condenser 103 is connected with the compressor 105, the inlet end of the electromagnetic control valve 104 is connected with the compressor 105, and one end of the indoor evaporator 101 is connected with the compressor 105; the other end of the outdoor condenser 103 is connected with the other end of the indoor evaporator 101 through the electronic expansion valve 102, and the outlet end of the electromagnetic control valve 104 is connected with the other end of the indoor evaporator 101 through the electronic expansion valve 102; the control device 106 is used for opening the electromagnetic control valve 104 when the electronic expansion valve 102 is blocked by oil; the refrigerant output by the compressor 105 enters the outdoor condenser 103 and the electromagnetic control valve 104 respectively, and enters the electronic expansion valve 102 through the outdoor condenser 103 and the electromagnetic control valve 104 respectively. Through the embodiment of the present application, the problems of the air conditioning system 10, such as the idling of the compressor 105, the decrease of capacity and power, and the lack of oil, caused by the blockage of the electronic expansion valve 102 can be avoided.

[0064] In the embodiment of the present application, the control device 106 is used for judging whether the electronic expansion valve 102 is blocked by oil according to the current first outdoor temperature and the current first pressure value of the outlet end of the electronic expansion valve 102.

[0065] In some feasible embodiments, during the switching between the heating mode and the cooling mode or the switching between the heating mode and the defrosting mode, too much oil enters the system, and when the compressor 105 is stopped and started again, the indoor evaporator 101 can appear the conditions of serious lack of refrigerant, large oil ratio of the compressor 105, and small pressure difference between the inlet and the outlet of the electronic expansion valve 102, which can easily cause the blockage of the electronic expansion valve 102, and as the outdoor environment temperature decreases, the probability of the blockage of the electronic expansion valve 102 increases.

[0066] Based on this, the control device 106 can obtain a first outdoor temperature of the current outdoor and a first pressure value of the outlet end of the electronic expansion valve 102 after the air conditioning system 10 is switched from the heating mode to the defrosting mode or the refrigerating mode and runs for a period of time, where the outlet end of the electronic expansion valve 102 can be the end close to the indoor evaporator 101.

[0067] After obtaining the first outdoor temperature and the first pressure value, the control device 106 can analyze whether the electronic expansion valve 102 has started to be blocked according to the first pressure value and the first outdoor temperature.

[0068] In an embodiment of the present application, the control device 106 is configured to determine whether the first outdoor temperature is lower than a first preset temperature value and whether the first pressure value is lower than a first preset pressure value, and determine that the electronic expansion valve 102 is blocked when the first outdoor temperature is lower than the first preset temperature value and the first pressure value is lower than the first preset pressure value.

[0069] In some possible embodiments, the control device 106 can obtain a first outdoor temperature of the current outdoor and a first pressure value of the outlet end of the electronic expansion valve 102 after the air conditioning system 10 is switched from the heating mode to the defrosting mode or the refrigerating mode and runs for a period of time.

[0070] Then, the control device 106 can analyze whether the electronic expansion valve 102 has started to be blocked according to the first outdoor temperature and the first pressure value. Specifically, the control device 106 can determine whether the first outdoor temperature is lower than a first preset temperature value and whether the first pressure value is lower than a first preset pressure value. The first preset temperature value and the first preset pressure value can be set according to actual conditions, and the embodiments of the present application do not make specific limitations in this regard.

[0071] If the control device 106 determines that the first outdoor temperature is lower than the first preset temperature value and the first pressure value is lower than the first preset pressure value, the control device 106 can determine that the electronic expansion valve 102 is blocked. At this time, the control device 106 can control the electromagnetic control valve 104 to be opened and control the high-temperature and high-pressure refrigerant output by the compressor 105 to enter the outdoor condenser 103 and the electromagnetic control valve 104, respectively. The refrigerant entering the outdoor condenser 103 and the electromagnetic control valve 104, respectively, will enter the electronic expansion valve 102 through the outdoor condenser 103 and the electromagnetic control valve 104, thereby realizing the dredging of the electronic expansion valve 102.

[0072] In an embodiment of the present application, the control device 106 is further configured to determine that the oil blockage of the electronic expansion valve 102 is unblocked when the current second outdoor temperature is not lower than the first preset temperature value and / or the current second pressure value at the outlet end of the electronic expansion valve 102 is not lower than the second preset pressure value after the first preset time period of opening the electromagnetic control valve 104.

[0073] In some possible embodiments, in order to determine whether the unblocking is completed, the control device 106 can reacquire the current second outdoor temperature and the current second pressure value at the outlet end of the electronic expansion valve 102 after the first preset time period of opening the electromagnetic control valve 104.

[0074] Then, the control device 106 can determine whether the electronic expansion valve 102 has completed the unblocking based on the second outdoor temperature and the second pressure value.

[0075] Specifically, if the second outdoor temperature is not lower than the first preset temperature value and / or the current second pressure value at the outlet end of the electronic expansion valve 102 is not lower than the second preset pressure value, the control device 106 can determine that the oil blockage of the electronic expansion valve 102 is unblocked; at this time, the control device 106 can close the electromagnetic control valve 104 to normally operate the outdoor condenser 103, the indoor evaporator 101, the electronic expansion valve 102 and the compressor 105 in the air conditioning system 10.

[0076] On the contrary, if the second outdoor temperature is lower than the first preset temperature value and the current second pressure value at the outlet end of the electronic expansion valve 102 is lower than the second preset pressure value, it can be determined that the electronic expansion valve 102 is not unblocked; at this time, the opening of the electromagnetic control valve 104 can be maintained or the opening degree of the electromagnetic control valve 104 can be increased, which is not limited in the embodiments of the present application.

[0077] In an embodiment of the present application, the control device 106 is further configured to determine that the oil blockage of the electronic expansion valve 102 is unblocked when the current second outdoor temperature is not lower than the first preset temperature value and / or the current second pressure value at the outlet end of the electronic expansion valve 102 is not lower than the second preset pressure value after the first preset time period of opening the electromagnetic control valve 104.

[0078] In some possible embodiments, the control device 106 can determine that the oil blockage of the electronic expansion valve 102 is not completely unblocked if it is detected that the second outdoor temperature is lower than the first preset temperature value and the second pressure value at the outlet end of the electronic expansion valve 102 is lower than the second preset pressure value; at this time, the control device 106 can also completely open the electronic expansion valve 102 to assist in unblocking the electronic expansion valve 102.

[0079] After the second preset time length after the electronic expansion valve 102 is completely opened, the control device 106 can detect whether the absolute value of the pressure difference between the electronic inlet end and the outlet end of the electronic expansion valve 102 is lower than a third preset pressure value. The inlet end of the electronic expansion valve 102 can be an end of the electronic expansion valve 102 away from the indoor evaporator 101.

[0080] If the absolute value of the difference is lower than the third preset pressure value, the control device 106 can determine that the oil blockage of the electronic expansion valve 102 is completely unblocked; at this time, the electromagnetic control valve 104 can be closed, and the control device 106 can normally maintain the opening degree of the electronic expansion valve 102 according to the set parameters of the air conditioning system 10.

[0081] Otherwise, the control device 106 can determine that the oil blockage of the electronic expansion valve 102 is not completely unblocked.

[0082] In an embodiment of the present application, the control device 106 is further configured to determine that the electronic expansion valve 102 has a fault when the absolute value of the pressure difference is not lower than the third preset pressure value; and the control device 106 is further configured to give a fault prompt for the electronic expansion valve 102.

[0083] In some possible embodiments, the control device 106 can determine that the electronic expansion valve 102 has a fault when the absolute value of the pressure difference is not lower than the third preset pressure value; at this time, the control device 106 can give a fault prompt for the electronic expansion valve 102; for example, the control device 106 can display a code of the fault of the electronic expansion valve 102 on the indoor unit, or send a fault prompt message to a user mobile device (for example, a mobile phone or the like) connected to the air conditioning system 10, so that the user mobile device gives a fault prompt for the electronic expansion valve 102, and the present application does not limit this embodiment.

[0084] In an embodiment of the present application, as shown in Figure 2 and Figure 3 The air conditioning system 10 further comprises:

[0085] The outdoor fan 109 is configured to adjust the temperature of the outdoor condenser 103.

[0086] In some possible embodiments, the air conditioning system 10 can further comprise an outdoor fan 109, and the outdoor fan 109 can be configured to adjust the temperature of the outdoor condenser 103.

[0087] In an example, the high-temperature and high-pressure refrigerant flowing out of the indoor evaporator 101 can release heat to the outdoor environment after entering the outdoor condenser 103; at this time, the outdoor fan 109 can increase the flow rate of air in indirect contact with the refrigerant, thereby improving the heat exchange efficiency of the refrigerant.

[0088] In another example, the high-temperature and high-pressure refrigerant flowing out of the indoor evaporator 101 can release heat to the outdoor environment after entering the outdoor condenser 103; at this time, the outdoor fan 109 can increase the flow rate of air in indirect contact with the refrigerant, thereby improving the heat exchange efficiency of the refrigerant.

[0089] In an embodiment of the present application, the air conditioning system 10 further comprises:

[0090] The first pressure sensor 107 is configured to detect the pressure at the end of the electronic expansion valve 102 away from the indoor evaporator 101.

[0091] The second pressure sensor 108 is configured to detect the pressure at the end of the electronic expansion valve 102 close to the indoor evaporator 101.

[0092] In some possible embodiments, the air conditioning system 10 can further comprise the first pressure sensor 107 and the second pressure sensor 108; wherein the first pressure sensor 107 can be arranged at the end of the electronic expansion valve 102 away from the indoor evaporator 101, i.e. the inlet end of the electronic expansion valve 102, so as to detect the pressure at the inlet end of the electronic expansion valve 102 and output the detection result to the control device 106.

[0093] The second pressure sensor 108 can be arranged at the end of the electronic expansion valve 102 close to the indoor evaporator 101, i.e. the outlet end of the electronic expansion valve 102, so as to detect the pressure at the outlet end of the electronic expansion valve 102 and output the detection result to the control device 106.

[0094] In an embodiment of the present application, the air conditioning system 10 further comprises:

[0095] The four-way valve 110 is configured to connect the compressor 105 with the indoor evaporator 101 and the compressor 105 with the outdoor condenser 103.

[0096] In some possible embodiments, the air conditioning system 10 can further comprise the four-way valve 110, which can be configured to connect the compressor 105 with the indoor evaporator 101 and the compressor 105 with the outdoor condenser 103.

[0097] In actual application, when the working mode of the air conditioning system 10 is switched, the control device 106 can adjust the flow direction of the refrigerant in the compressor 105, the indoor evaporator 101 and the outdoor condenser 103 by controlling the four-way valve 110.

[0098] Specifically, in the cooling mode, the control device 106 can adjust the four-way valve 110; at this time, the four-way valve 110 makes the refrigerant from the compressor 105 first enter the outdoor condenser 103, then throttles and depressurizes through the electronic expansion valve 102, and then enters the indoor evaporator 101. The refrigerant is condensed in the outdoor condenser 103, releasing heat to the outdoor air. The refrigerant evaporates in the indoor evaporator 101, absorbing the heat of the indoor air, making the indoor air cold.

[0099] In the heating mode, the control device 106 can adjust the four-way valve 110; at this time, the four-way valve 110 changes the flow direction of the refrigerant, so that the refrigerant from the compressor 105 first enters the indoor evaporator 101, then throttles and depressurizes through the electronic expansion valve 102, and then enters the outdoor condenser 103. The refrigerant evaporates in the outdoor condenser 103, absorbing the heat of the outdoor air, making the outdoor air cold. The refrigerant condenses in the indoor evaporator 101, releasing heat to the indoor air, making the indoor air warm.

[0100] The four-way valve 110 is usually composed of a valve body, an electromagnetic coil and a valve core. Among them, the valve body contains multiple channels and valve cores for controlling the flow direction of the refrigerant. The electromagnetic coil drives the valve core to move by receiving the control signal, changing the flow direction of the refrigerant. The valve core moves to different positions under the action of the electromagnetic coil, thereby changing the flow path of the refrigerant.

[0101] In the cooling mode, the electromagnetic coil does not work, the valve core is in the default position, and the refrigerant flows according to the cooling mode path.

[0102] In the heating mode, the control device 106 can energize the electromagnetic coil, the valve core moves to a new position, and the refrigerant flows according to the heating mode path.

[0103] As shown in Figure 2 When the air conditioning system 10 is in the heating mode, the control device 106 can control the electromagnetic control valve 104 to be closed; at this time, the refrigerant output by the compressor 105 can first enter the indoor evaporator 101 through the four-way valve 110, and enter the electronic expansion valve 102 from the indoor evaporator 101; then enter the outdoor condenser 103 from the electronic expansion valve 102, and then enter the compressor 105 from the outdoor condenser 103 through the four-way valve 110.

[0104] As shown in Figure 3As shown, when the air conditioning system 10 is in the cooling mode or the defrost mode, the control device 106 can control the electromagnetic control valve 104 to open; at this time, the refrigerant output by the compressor 105 can first enter the outdoor condenser 103 through the four-way valve 110, and directly enter the electromagnetic control valve 104 through the exhaust port of the compressor. The refrigerant entering the outdoor condenser 103 can further enter the indoor evaporator 101 through the electronic expansion valve 102, and return to the compressor via the indoor evaporator 101, the four-way valve 110.

[0105] The refrigerant entering the electromagnetic control valve 104 can directly enter the indoor evaporator 101 through the electronic expansion valve 102, and return to the compressor via the indoor evaporator 101, the four-way valve 110.

[0106] Based on the air conditioning system mentioned in the above embodiment, the embodiment of the present application further provides an oil blockage dredging method which can be applied to the air conditioning system mentioned in the above embodiment. Specifically, the oil blockage dredging method can include the following steps: Figure 4 , Figure 4 A step flow chart of the oil blockage dredging method of the embodiment of the present application is shown.

[0107] As Figure 4 shown, the oil blockage dredging method can include the following steps:

[0108] Step 401, judging whether the electronic expansion valve is blocked according to the current first outdoor temperature and the current first pressure value at the outlet end of the electronic expansion valve.

[0109] In the embodiment of the present application, the other end of the outdoor condenser is connected to the other end of the indoor evaporator through the electronic expansion valve; therefore, when the air conditioning system is switched from the heating mode to the defrost mode or the cooling mode, the low-temperature and liquid cooling liquid output by the outdoor condenser will enter the indoor evaporator through the electronic expansion valve. During this process, the low-temperature and liquid cooling liquid may be blocked in the electronic expansion valve, thereby affecting the operation of the air conditioning system.

[0110] In order to avoid the electronic expansion valve from affecting the operation of the air conditioning system due to oil blockage, an additional branch is additionally provided in the air conditioning system in the embodiment of the present application, which can directly deliver the high-pressure and high-temperature refrigerant output by the compressor to the electronic expansion valve, so as to dredge the electronic expansion valve with oil blockage by the high-temperature and high-pressure refrigerant.

[0111] Specifically, the inlet end of the electromagnetic control valve can be connected with the outlet end of the compressor, and the outlet end of the electromagnetic control valve can be connected with the electronic expansion valve; thus, when it is necessary to dredge the electronic expansion valve, the control device can control the electromagnetic control valve to open, and the high-temperature and high-pressure refrigerant output by the compressor can be output to the outdoor condenser and enter the electronic expansion valve through the outdoor condenser on one hand; on the other hand, the high-temperature and high-pressure refrigerant output by the compressor can also directly enter the electronic expansion valve through the electromagnetic control valve. Compared with the coolant entering the electronic expansion valve through the outdoor condenser, the refrigerant flowing through the electromagnetic control valve has a shorter path and does not undergo heat exchange and pressure reduction, and thus the temperature and pressure of the refrigerant are higher, which can effectively dredge the oil-clogged electronic expansion valve.

[0112] For example, the electromagnetic control valve is in a closed state by default; when the control device detects that the electronic expansion valve is oil-clogged, the control device can first open the electromagnetic control valve; after the electromagnetic control valve is opened, the control device can control the high-temperature and high-pressure refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve, respectively; the refrigerant entering the outdoor condenser and the electromagnetic control valve, respectively, will enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve, thereby dredging the electronic expansion valve.

[0113] In some possible embodiments, the control device can obtain a first outdoor temperature and a first pressure value of an outlet end of the electronic expansion valve after the air conditioning system is switched from a heating mode to a defrosting mode or a cooling mode and runs for a period of time, where the outlet end of the electronic expansion valve is an end close to the indoor evaporator.

[0114] After obtaining the first outdoor temperature and the first pressure value, the control device can analyze whether the electronic expansion valve has started to be oil-clogged according to the first pressure value and the first outdoor temperature.

[0115] Step 402, when the electronic expansion valve is oil-clogged, the electromagnetic control valve is opened to control the refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve, respectively, and enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve, respectively.

[0116] When it is determined that the electronic expansion valve is oil-clogged, the control device can control the electromagnetic control valve to open and control the high-temperature and high-pressure refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve, respectively; the refrigerant entering the outdoor condenser and the electromagnetic control valve, respectively, will enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve, thereby dredging the electronic expansion valve.

[0117] In some possible embodiments, the control device can acquire a first outdoor temperature of the current outdoor and a first pressure value of the outlet end of the electronic expansion valve after the air conditioning system is switched from the heating mode to the defrosting mode or the refrigerating mode and runs for a period of time.

[0118] Then, the control device can analyze whether the electronic expansion valve has started to be blocked according to the first outdoor temperature and the first pressure value. Specifically, the control device can determine whether the first outdoor temperature is lower than a first preset temperature value and the first pressure value is lower than a first preset pressure value. The first preset temperature value and the first preset pressure value can be set according to actual conditions, and embodiments of the present application do not make specific limitations in this regard.

[0119] If the control device determines that the first outdoor temperature is lower than the first preset temperature value and the first pressure value is lower than the first preset pressure value, the control device can determine that the electronic expansion valve has been blocked. At this time, the control device can control the electromagnetic control valve to be opened and control the high-temperature and high-pressure refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve, respectively. The refrigerant entering the outdoor condenser and the electromagnetic control valve will enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve, thereby realizing the dredging of the electronic expansion valve.

[0120] In some possible embodiments, in order to detect whether the dredging is completed, the control device can reacquire a second outdoor temperature of the current outdoor and a second pressure value of the outlet end of the electronic expansion valve after the first preset time length of the opened electromagnetic control valve.

[0121] Then, the control device can detect whether the electronic expansion valve has completed the dredging based on the second outdoor temperature and the second pressure value.

[0122] Specifically, if the second outdoor temperature is not lower than the first preset temperature value and / or the second pressure value of the outlet end of the electronic expansion valve is not lower than a second preset pressure value, the control device can determine that the oil blocking of the electronic expansion valve has completed the dredging. At this time, the control device can close the electromagnetic control valve to normally operate the outdoor condenser, the indoor evaporator, the electronic expansion valve and the compressor in the air conditioning system.

[0123] On the contrary, if the second outdoor temperature is lower than the first preset temperature value and the second pressure value of the outlet end of the electronic expansion valve is lower than the second preset pressure value, it can be determined that the electronic expansion valve has not completed the dredging. At this time, the opening of the electromagnetic control valve can be continuously maintained or the opening degree of the electromagnetic control valve can be increased, and embodiments of the present application do not make limitations in this regard.

[0124] In some feasible embodiments, if the control device detects that the second outdoor temperature is lower than the first preset temperature value and the current second pressure value at the outlet of the electronic expansion valve is lower than the second preset pressure value, it can determine that the oil blockage of the electronic expansion valve has not been cleared. At this time, the control device can also fully open the electronic expansion valve to assist in clearing the electronic expansion valve.

[0125] After a second preset time following the full opening of the electronic expansion valve, the control device can detect whether the absolute value of the pressure difference between the electronic inlet and the outlet of the electronic expansion valve is lower than a third preset pressure value. The inlet of the electronic expansion valve can be the end of the electronic expansion valve furthest from the indoor evaporator.

[0126] If the absolute value of the difference is lower than the third preset pressure value, the control device can determine that the oil blockage of the electronic expansion valve has been cleared; at this time, the solenoid control valve can be closed, and the control device can maintain the opening of the electronic expansion valve normally according to the setting parameters of the air conditioning system.

[0127] Conversely, the control device can determine that the oil blockage in the electronic expansion valve has not been cleared.

[0128] In some feasible embodiments, when the control device determines that the absolute value of the pressure difference is not lower than a third preset pressure value, it can determine that the electronic expansion valve is faulty. At this time, the control device can provide a fault warning for the electronic expansion valve. For example, the control device can display the fault code of the electronic expansion valve on the indoor unit, or it can send a fault warning message to the user's mobile device (e.g., mobile phone) connected to the air conditioning system so that the user's mobile device can provide a fault warning for the electronic expansion valve. This embodiment of the present invention does not limit this.

[0129] For example, such as Figure 5 As shown, when the air conditioner is running in heating mode and receives a defrosting or switching to cooling mode command, it detects the current outdoor ambient temperature T. 外环 (First outdoor temperature) and first pressure value P1; after the compressor has been running for a period of time t, the control device determines whether the following conditions are met:

[0130] T 外环 <T 设 P1 <P 设1 If so, it indicates a possible or existing oil blockage fault. Open the solenoid control valve to open the passage and maintain this for a period t2, during which time the following conditions are monitored:

[0131] T 外环 ≥T 设 , and / or P1≥P 设2If yes, it indicates that the oil blockage fault is excluded, the electromagnetic control valve is closed, and the system continues to operate in the normal defrosting or refrigeration mode, otherwise it indicates that the electronic expansion valve valve may have an opening and closing fault, the compressor is stopped, the electronic expansion valve opening is set to maximum, and after 60s, it is judged whether the system parameters satisfy: |P1-P2|<P 设3 If yes, it indicates that the expansion valve valve has been dredged, otherwise it indicates that the valve has a fault, the system is stopped and the indoor unit displays the expansion valve fault code.

[0132] Wherein: 1. The compressor preset running time t1=1 / 4t 化 ;

[0133] 2. The electromagnetic control valve preset opening time t2≤1 / 4t 化 ; t 化 is the length of the defrosting mode;

[0134] 3. Taking a refrigeration capacity of 3.5kW unit as an example, T 设 =35℃;

[0135] 4. P 设1 =0.05MPa; P 设2 =0.1MPa; P 设3 =0.05MPa;

[0136] 5. The pipe diameter of the electromagnetic control valve is not more than 1 / 3 of the main pipe.

[0137] In the embodiment of the application, whether the electronic expansion valve is blocked is judged according to the current first outdoor temperature and the current first pressure value at the outlet end of the electronic expansion valve; when the electronic expansion valve is blocked, the electromagnetic control valve is opened to control the refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve respectively, and then enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively. Through the embodiment of the application, the problems of compressor idling, capacity and power reduction, oil shortage and the like of the air conditioning system caused by the blockage of the electronic expansion valve can be avoided.

[0138] It should be noted that, for the method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the embodiment of the application is not limited by the action sequence described, because according to the embodiment of the application, certain steps can be adopted in other order or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions involved are not necessarily necessary for the embodiment of the application.

[0139] Referring to Figure 6 , a structure schematic diagram of a blockage dredging device of the embodiment of the application is shown, which can be applied to the air conditioning system mentioned in the above embodiment.

[0140] like Figure 6 As shown, the oil blockage clearing device may include the following modules:

[0141] The judgment module 601 is used to determine whether the electronic expansion valve is blocked by oil based on the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve.

[0142] The unblocking module 602 is used to open the solenoid control valve when oil blockage occurs in the electronic expansion valve, so as to control the refrigerant output by the compressor to enter the outdoor condenser and the solenoid control valve respectively, and then enter the electronic expansion valve through the outdoor condenser and the solenoid control valve respectively.

[0143] In this embodiment of the invention, based on the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve, it is determined whether the electronic expansion valve is clogged with oil. When the electronic expansion valve is clogged with oil, the electromagnetic control valve is opened to control the refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve respectively, and then enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively. Through this embodiment of the invention, problems such as compressor idling, reduced capacity and power, and oil shortage in the air conditioning system caused by blockage of the electronic expansion valve can be avoided.

[0144] This invention also provides an electronic device, including a processor, a memory, and a computer program stored in the memory and capable of running on the processor. When the computer program is executed by the processor, it implements the above-described method for unblocking oil blockages.

[0145] This invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-described method for unblocking oil blockages.

[0146] As the apparatus embodiment is basically similar to the method embodiment, it is described in a relatively simple manner. For relevant details, please refer to the description of the method embodiment.

[0147] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0148] Those skilled in the art will appreciate that embodiments of the application can be readily used as software, hardware, or a combination of software and hardware. In one embodiment, the present application can be implemented in software and / or firmware. In particular, various

[0149] Embodiments of the present application are described in terms of methods, terminal devices (systems), and computer program products, in flowcharts and / or block diagrams. It will be understood that each and every flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts 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 processing device, or other programmable data processing terminal devices to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal devices, create means for implementing the functions specified in the flowcharts and / or block diagrams block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0150] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing terminal device to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0151] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device to cause a series of operational steps to be performed on the computer or other programmable terminal device to produce a computer-implemented process such that the instructions which execute on the computer or other programmable terminal device provide steps for implementing the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks.

[0152] Although preferred embodiments of the application have been described, those skilled in the art will recognize that additional modifications and changes can be made thereto without departing from the scope of the present application. Accordingly, the appended claims are intended to cover all such modifications and changes as fall within the scope of the application.

[0153] Finally, it is to be understood that the phraseology or terminology such as "first" and "second" etc. used herein is merely intended to differentiate one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0154] The above provides an air conditioning system, a method for unblocking an oil block, an unblocking device for an oil block, an electronic device and a computer readable storage medium, and the principles and implementation manners of the present application are described by applying specific examples in the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manners and application ranges will be changed, and the above description of the present application should not be understood as a limitation of the present application.

Claims

1. An air conditioning system, characterized by, The air conditioning system comprises an indoor evaporator, an electronic expansion valve, an outdoor condenser, an electromagnetic control valve, a compressor and a control device. One end of the outdoor condenser is connected with the compressor, and the inlet end of the electromagnetic control valve is connected with the compressor. The other end of the outdoor condenser is connected with the other end of the indoor evaporator through the electronic expansion valve, and the outlet end of the electromagnetic control valve is connected with the other end of the indoor evaporator through the electronic expansion valve. The control device is used for opening the electromagnetic control valve when the electronic expansion valve is blocked by oil, and the refrigerant output by the compressor enters the outdoor condenser and the electromagnetic control valve respectively and enters the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively; the control device is used for judging whether the current first outdoor temperature is lower than a first preset temperature value and whether the first pressure value of the outlet end of the electronic expansion valve is lower than a first preset pressure value; when the first outdoor temperature is lower than the first preset temperature value and the first pressure value is lower than the first preset pressure value, it is determined that the electronic expansion valve is blocked by oil.

2. The air conditioning system of claim 1, wherein The control device is further used for determining that the oil blockage of the electronic expansion valve is unblocked when the current second outdoor temperature is not lower than the first preset temperature value and / or the second pressure value of the outlet end of the electronic expansion valve is not lower than a second preset pressure value after the electromagnetic control valve is opened for a first preset time length.

3. The air conditioning system of claim 2, wherein The control device is further used for determining that the oil blockage of the electronic expansion valve is not unblocked when the current second outdoor temperature is lower than the first preset temperature value and the second pressure value of the outlet end of the electronic expansion valve is lower than the second preset pressure value; when it is determined that the oil blockage of the electronic expansion valve is not unblocked, the electronic expansion valve is completely opened, and when the absolute value of the pressure difference between the inlet end of the electronic expansion valve and the outlet end of the electronic expansion valve is lower than a third preset pressure value after a second preset time length, it is determined that the oil blockage of the electronic expansion valve is unblocked.

4. The air conditioning system of claim 3, wherein The control device is further used for determining that the electronic expansion valve has a fault when the absolute value of the pressure difference is not lower than the third preset pressure value; and the control device is further used for giving a fault prompt for the electronic expansion valve.

5. The air conditioning system of claim 1, wherein, The air conditioning system further comprises: An outdoor fan for temperature regulation of the outdoor condenser.

6. The air conditioning system of claim 1, wherein, The air conditioning system further comprises: A first pressure sensor for detecting the pressure of the end of the electronic expansion valve away from the indoor evaporator; A second pressure sensor for detecting the pressure of the end of the electronic expansion valve close to the indoor evaporator.

7. The air conditioning system of claim 1, wherein, The air conditioning system further comprises: A four-way valve for connection of the compressor with the indoor evaporator and the compressor with the outdoor condenser.

8. A method of unblocking an oil plug, characterized in that, The method is applied to the air conditioning system of any one of claims 1-7, and the method comprises: determining whether the electronic expansion valve is blocked according to the current first outdoor temperature and a current first pressure value at an outlet end of the electronic expansion valve; when the electronic expansion valve is blocked, opening the electromagnetic control valve to control the refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve respectively, and to enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

9. A device for unblocking an oil plug, characterized in that The device is applied to the air conditioning system according to any one of claims 1-7, and the device comprises: a determining module configured to determine whether the electronic expansion valve is blocked according to the current first outdoor temperature and a current first pressure value at an outlet end of the electronic expansion valve; a dredging module configured to, when the electronic expansion valve is blocked, open the electromagnetic control valve to control the refrigerant output by the compressor to enter the outdoor condenser and the electromagnetic control valve respectively, and to enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

10. An electronic device, comprising: The computer program is stored on the computer readable storage medium and is capable of being run on the processor, and when the computer program is executed by the processor, the oil blockage dredging method according to claim 8 is realized.

11. A computer readable storage medium, characterized in that, The computer program is stored on the computer readable storage medium and is capable of being run on the processor, and when the computer program is executed by the processor, the oil blockage dredging method according to claim 8 is realized.

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