Air conditioning system, oil blockage dredging method and device, electronic equipment and storage medium

Abstract

The invention provides an air conditioning system, an oil blockage dredging method and device, electronic equipment and a storage medium. 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 subjected to oil blockage; and a refrigerant output by the compressor respectively enters the outdoor condenser and the electromagnetic control valve, and respectively enters the electronic expansion valve through the outdoor condenser and the electromagnetic control valve. According to the invention, the electronic expansion valve can be prevented from being blocked.

Description

Technical Field

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

[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 refrigerants with high ODP (Ozone Depletion Potential) or high GWP, such as HCFCs (hydrochlorofluoroalkanes) and HFCs (hydrofluorocarbons), R290 has been gradually used in air conditioners as an alternative refrigerant.

[0004] However, the existing technology shows that the viscosity of ordinary mineral lubricants will increase sharply at low temperatures, especially in inverters for heating and cooling. When the defrost mode is entered and the four-way valve is reversed, the ultra-low temperature refrigerant and lubricant in the heat exchanger need to enter the heat exchanger through the electronic expansion valve. However, for R290 refrigerant, due to safety considerations, the filling amount of R290 refrigerant is relatively small. Under the same capacity and energy efficiency, the filling amount required for R290 refrigerant is much less than that of refrigerants such as R32 (difluoromethane) and R143A (trifluoroethane). The compressor oil accounts for a larger proportion in the system, so the system pressure is also smaller. When the outer ring temperature is low, it is easy to cause the relatively high viscosity lubricant to block the normally opened electronic expansion valve, causing the R290 refrigerant to be unable to participate in the circulation, which in turn causes the compressor to idle, the capacity and power to decrease, and the system to lack oil and fluorine. After long-term 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 of the invention

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

[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 to the other end of the indoor evaporator through the electronic expansion valve, and the outlet end of the electromagnetic control valve is connected to the other end of the indoor evaporator through the electronic expansion valve;

[0009] The control device is used to open the electromagnetic control valve when oil blockage occurs in the electronic expansion valve; 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 used to determine whether the electronic expansion valve is oil-blocked based on a current first outdoor temperature and a current first pressure value at an outlet of the electronic expansion valve.

[0011] Optionally, the control device is used 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 also used to determine that the oil blockage of the electronic expansion valve is cleared 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 of the electronic expansion valve is not lower than the second preset pressure value after the solenoid control valve is opened for a first preset period of time.

[0013] Optionally, the control device is also used to determine that the oil blockage in the electronic expansion valve has not been cleared when the current 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; when it is determined that the oil blockage in the electronic expansion valve has not been cleared, fully open the electronic expansion valve, and after a second preset time, 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, it is determined that the oil blockage in the electronic expansion valve has been cleared.

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

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

[0016] An outdoor fan is used to adjust the temperature of the outdoor condenser.

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

[0018] A first pressure sensor, used for detecting the pressure at one end of the electronic expansion valve away from the indoor evaporator;

[0019] The second pressure sensor is used to detect the pressure at one end of the electronic expansion valve close to the indoor evaporator.

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

[0021] The four-way valve is used for connecting the compressor with the indoor evaporator and the compressor with the outdoor condenser.

[0022] The embodiment of the present invention further provides a method for clearing oil blockage, which is applied to the air conditioning system as described above, and the method comprises:

[0023] According to the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve, determining whether the electronic expansion valve is oil blocked;

[0024] When the electronic expansion valve is blocked by 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 enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

[0025] The embodiment of the present invention further provides an oil blockage dredging device, which is applied to the air conditioning system as described above, and the device comprises:

[0026] A judgment module, used for judging 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 of the electronic expansion valve;

[0027] The unblocking module is used to open the electromagnetic 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 electromagnetic control valve respectively, and enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

[0028] An embodiment of the present invention further provides an electronic device, including a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program implements the above-mentioned method for unblocking oil blockage when executed by the processor.

[0029] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned method for unblocking oil blockage is implemented.

[0030] The embodiments of the present invention have the following advantages:

[0031] In an embodiment of the present invention, the air conditioning system includes: 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 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; the other end of the outdoor condenser is connected to the other end of the indoor evaporator through the electronic expansion valve, and the outlet end of the electromagnetic control valve is connected to the other end of the indoor evaporator through the electronic expansion valve; the control device is used 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. Through the embodiment of the present invention, it is possible to avoid the problems of compressor idling, capacity and power reduction, oil shortage, etc. in the air conditioning system caused by the blockage of the electronic expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

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

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

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

[0036] Figure 4 It is a flowchart of the steps of a method for clearing oil blockage according to an embodiment of the present invention;

[0037] Figure 5 This is a flow chart of steps for clearing oil blockage of an electronic expansion valve according to an embodiment of the present invention;

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

[0039] Description of the accompanying drawings:

[0040] Air conditioning system 10 , indoor evaporator 101 , electronic expansion valve 102 , outdoor condenser 103 , solenoid 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-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In order to avoid the problems of compressor idling, capacity and power reduction, oil shortage, etc. in the air-conditioning system caused by the blockage of the electronic expansion valve, an embodiment of the present invention provides an air-conditioning system, in which an electromagnetic control valve connecting the compressor and the electronic expansion valve is additionally provided, 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 clear the oil blockage. For details, please refer to Figure 1 , Figure 1 A structural schematic diagram of an air conditioning system according to an embodiment of the present invention is shown.

[0043] like Figure 1 As shown, the air conditioning system 10 may 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 to the compressor 105, the inlet end of the electromagnetic control valve 104 is connected to the compressor 105, and one end of the indoor evaporator 101 is connected to the compressor 105;

[0045] The other end of the outdoor condenser 103 is connected to 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 to the other end of the indoor evaporator 101 through the electronic expansion valve 102;

[0046] The control device 106 is used to open 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.

[0047] In the embodiment of the present invention, the indoor evaporator 101 is a heat exchanger in the air conditioning system 10, which is responsible for absorbing heat from the indoor air in the cooling mode and the defrosting mode, or dissipating heat to the indoor air in the heating mode. In the cooling mode or the defrosting mode, the refrigerant changes from liquid to gas in the indoor evaporator 101, absorbs heat from the surrounding air, and thus reduces the temperature of the indoor air. In the heating mode, the refrigerant changes from gas to liquid in the indoor evaporator 101, releases heat to the surrounding air, and thus increases the temperature of the indoor air.

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

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

[0050] The compressor 105 is the heart of the air conditioning system 10 and is responsible for increasing the pressure and temperature of the refrigerant. Specifically, in the cooling mode or the defrosting mode, the compressor 105 sucks in the low-pressure and low-temperature refrigerant gas that has absorbed heat from the indoor evaporator 101, and then compresses it mechanically to convert it into a high-pressure and high-temperature gas, and then sends it 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 from the outdoor condenser 103, and then compresses it mechanically to convert it into a high-pressure and high-temperature gas, and then sends it 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, the control device 106 can control the indoor evaporator 101 to change the refrigerant flowing therein from liquid to gas in the cooling mode or defrosting mode, so as to absorb the heat of the surrounding air, thereby reducing the temperature of the indoor air. In the heating mode, the control device 106 can control the indoor evaporator 101 to change the refrigerant flowing therein from gas to liquid, so as to release heat to the surrounding air, thereby increasing the temperature of the indoor air.

[0053] The control device 106 can also adjust the flow of the refrigerant 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 state, thereby improving the energy efficiency and stability of the system.

[0054] The control device 106 can also control the outdoor condenser 103 to release the heat of the refrigerant to the outside in the cooling mode or the defrosting mode, and the refrigerant changes from gas to liquid. In the heating mode, the control device 106 controls the outdoor condenser 103 to absorb the heat of the outdoor into the refrigerant, and the refrigerant changes from liquid to gas.

[0055] The control device 106 can also control the compressor 105 to absorb the low-pressure and low-temperature refrigerant gas that has absorbed heat in the indoor evaporator 101 in the cooling mode or the defrosting mode, and then convert it into a high-pressure and high-temperature gas through mechanical compression, and then send it to the outdoor condenser 103. In the heating mode, the compressor 105 is controlled to absorb the low-pressure and low-temperature refrigerant gas that has absorbed heat in the outdoor condenser 103, and then convert it into a high-pressure and high-temperature gas through mechanical compression, and then send it to the indoor evaporator 101. The embodiment of the present invention does not limit this.

[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 the indoor evaporator 101, in the cooling mode or the defrosting mode, the refrigerant output by the compressor 105 can first pass through the outdoor condenser 103 to release heat to the outdoor environment; the refrigerant can change from gas to liquid in the outdoor condenser 103. Then, it passes through the indoor evaporator 101 and vaporizes from liquid to gas. In this process, the refrigerant can absorb heat in the indoor environment, thereby achieving the purpose of lowering the indoor temperature. The vaporized refrigerant can re-enter the compressor 105 for compression.

[0058] In the heating mode, the refrigerant output by the compressor 105 can first pass through the indoor evaporator 101 to release heat to the indoor environment, thereby achieving the purpose of raising the indoor temperature; at this time, the refrigerant vaporizes 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 to the other end of the indoor evaporator 101 through the electronic expansion valve 102; therefore, when the air conditioning system 10 switches from the heating mode to the defrosting mode or the cooling mode, the low-temperature, liquid coolant output by the outdoor condenser 103 will enter the indoor evaporator 101 through the electronic expansion valve 102. In this process, the low-temperature, liquid coolant may be blocked in the electronic expansion valve 102, thereby affecting the operation of the air conditioning system 10.

[0060] In order to prevent the electronic expansion valve 102 from being blocked by oil and affecting the operation of the air-conditioning system 10, an additional branch is provided in the air-conditioning system 10 in the embodiment of the present invention, which can directly deliver the high-pressure and high-temperature refrigerant output by the compressor 105 to the electronic expansion valve 102, thereby clearing the electronic expansion valve 102 that is blocked by oil through the high-temperature and high-pressure refrigerant.

[0061] Specifically, the inlet end of the electromagnetic control valve 104 can be connected to the outlet end of the compressor 105, and the outlet end of the electromagnetic control valve 104 can be connected to the electronic expansion valve 102; thus, when the electronic expansion valve 102 needs to be unblocked, the control device 106 can control the electromagnetic control valve 104 to open, and the high-temperature, high-pressure refrigerant output by the compressor 105 can be output to the outdoor condenser 103 on the one hand, and enter the electronic expansion valve 102 through the outdoor condenser 103; on the other hand, the high-temperature, high-pressure refrigerant output 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 undergo heat exchange and pressure reduction, so its temperature and pressure are higher, which can effectively unblock the electronic expansion valve 102 that is blocked by oil.

[0062] Exemplarily, the solenoid 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 solenoid control valve 104 can be opened first; when the solenoid control valve 104 is opened, the control device 106 can control the high-temperature, high-pressure refrigerant output by the compressor 105 to enter the outdoor condenser 103 and the solenoid control valve 104 respectively; the refrigerant entering the outdoor condenser 103 and the solenoid control valve 104 respectively will enter the electronic expansion valve 102 via the outdoor condenser 103 and the solenoid control valve 104, thereby achieving the unblocking of the electronic expansion valve 102.

[0063] In an embodiment of the present invention, the air conditioning system 10 includes: 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 to the compressor 105, the inlet end of the electromagnetic control valve 104 is connected to the compressor 105, and one end of the indoor evaporator 101 is connected to the compressor 105; the other end of the outdoor condenser 103 is connected to 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 to the other end of the indoor evaporator 101 through the electronic expansion valve 102; the control device 106 is used to open 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 invention, it is possible to avoid problems such as idling of the compressor 105 , reduced capacity and power, and lack of oil in the air-conditioning system 10 due to blockage of the electronic expansion valve 102 .

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

[0065] In some feasible embodiments, during the switching process from heating mode to cooling mode, or from heating mode to defrost mode, too much oil enters the system, and when the compressor 105 is shut down and restarted, the indoor evaporator 101 will be seriously short of refrigerant, the compressor 105 will account for a large proportion of oil, and the pressure difference between the inlet and outlet of the electronic expansion valve 102 will be small, which may easily cause the electronic expansion valve 102 to become blocked by oil and fail. As the outdoor ambient temperature decreases, the probability of oil blockage in the expansion valve increases.

[0066] Based on this, the control device 106 can obtain the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve 102 after the air-conditioning system 10 switches from the heating mode to the defrost mode or the cooling mode and runs for a period of time; wherein the outlet of the electronic expansion valve 102 can be an 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 begun to be blocked by oil according to the first pressure value and the first outdoor temperature.

[0068] In one embodiment of the present invention, the control device 106 is used 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 102 is oil blocked.

[0069] In some feasible embodiments, the control device 106 can obtain the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve 102 after the air-conditioning system 10 switches from the heating mode to the defrost mode or the cooling mode and runs for a period of time.

[0070] Then, the control device 106 can analyze whether the electronic expansion valve 102 has begun to be blocked by oil 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 the first preset temperature value, and whether the first pressure value is lower than the first preset pressure value. The first preset temperature value and the first preset pressure value can be set according to actual conditions, and the embodiment of the present invention does not impose specific restrictions on this.

[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 has been blocked by oil; at this time, the control device 106 can control the solenoid control valve 104 to open, and control the high-temperature and high-pressure refrigerant output by the compressor 105 to enter the outdoor condenser 103 and the solenoid control valve 104 respectively; the refrigerant entering the outdoor condenser 103 and the solenoid control valve 104 respectively will enter the electronic expansion valve 102 via the outdoor condenser 103 and the solenoid control valve 104, thereby achieving the unblocking of the electronic expansion valve 102.

[0072] In one embodiment of the present invention, the control device 106 is also used to determine that the oil blockage of the electronic expansion valve 102 is cleared 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 of the electronic expansion valve 102 is not lower than the second preset pressure value after the electromagnetic control valve 104 is opened for a first preset time.

[0073] In some feasible embodiments, in order to detect whether the unblocking is completed, the control device 106 can re-obtain the current second outdoor temperature and the current second pressure value at the outlet of the electronic expansion valve 102 after opening the electromagnetic control valve 104 for a first preset time.

[0074] Then, the control device 106 can detect whether the electronic expansion valve 102 has been unblocked 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 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 has been cleared; at this time, the control device 106 can close the solenoid control valve 104 to normally operate the outdoor condenser 103, indoor evaporator 101, electronic expansion valve 102 and 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 of the electronic expansion valve 102 is lower than the second preset pressure value, it can be determined that the electronic expansion valve 102 has not completed the unblocking; at this time, the electromagnetic control valve 104 can continue to be maintained open, or the opening degree of the electromagnetic control valve 104 can be increased, and the embodiment of the present invention does not limit this.

[0077] In one embodiment of the present invention, the control device 106 is also used to determine that the oil blockage of the electronic expansion valve 102 has not been cleared when the current 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 102 is lower than the second preset pressure value; when it is determined that the oil blockage of the electronic expansion valve 102 has not been cleared, the electronic expansion valve 102 is fully opened, and after a second preset time, when the absolute value of the pressure difference between the inlet end of the electronic expansion valve 102 and the outlet end of the electronic expansion valve 102 is lower than the third preset pressure value, it is determined that the oil blockage of the electronic expansion valve 102 has been cleared.

[0078] In some feasible embodiments, if the control device 106 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 102 is lower than the second preset pressure value, it can be determined that the oil blockage of the electronic expansion valve 102 has not been cleared; at this time, the control device 106 can also fully open the electronic expansion valve 102 to assist in clearing the electronic expansion valve 102.

[0079] After the second preset time after the electronic expansion valve 102 is fully 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 the third preset pressure value. The inlet end of the electronic expansion valve 102 can be the 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 has been cleared; at this time, the solenoid control valve 104 can be closed, and the control device 106 can maintain the opening of the electronic expansion valve 102 normally according to the setting parameters of the air-conditioning system 10.

[0081] Otherwise, the control device 106 may determine that the oil blockage of the electronic expansion valve 102 has not been cleared.

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

[0083] In some feasible embodiments, when the control device 106 determines that the absolute value of the pressure difference is not lower than the third preset pressure value, it can determine that there is a fault in the electronic expansion valve 102; at this time, the control device 106 can issue a fault prompt for the electronic expansion valve 102; illustratively, the control device 106 can display the fault code of the electronic expansion valve 102 on the indoor unit, or it can send a fault prompt information to a user mobile device (for example, a mobile phone, etc.) connected to the air-conditioning system 10, so that the user's mobile device can issue a fault prompt for the electronic expansion valve 102. The embodiments of the present invention are not limited to this.

[0084] In one embodiment of the present invention, Figure 2 and Figure 3 As shown, the air conditioning system 10 further includes:

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

[0086] In some feasible embodiments, the air conditioning system 10 may further include an external fan 109 , which may be used to adjust the temperature of the outdoor condenser 103 .

[0087] For example, the high-temperature, high-pressure refrigerant flowing out of the compressor 105 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 the air that is indirectly in contact with the refrigerant, thereby improving the heat exchange efficiency of the refrigerant.

[0088] As another example, the high-temperature, 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 the air that is in indirect contact with the refrigerant, thereby improving the heat exchange efficiency of the refrigerant.

[0089] In one embodiment of the present invention, the air conditioning system 10 further includes:

[0090] A first pressure sensor 107 is used to detect the pressure at one end of the electronic expansion valve 102 away from the indoor evaporator 101;

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

[0092] In some feasible embodiments, the air-conditioning system 10 may further include a first pressure sensor 107 and a second pressure sensor 108; wherein the first pressure sensor 107 may be arranged at an 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 be used 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 one end of the electronic expansion valve 102 close to the indoor evaporator 101, that is, 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 one embodiment of the present invention, the air conditioning system 10 further includes:

[0095] The four-way valve 110 is used for connecting the compressor 105 with the indoor evaporator 101 , and the compressor 105 with the outdoor condenser 103 .

[0096] In some feasible embodiments, the air conditioning system 10 may further include a four-way valve 110 , which may be used to connect the compressor 105 to the indoor evaporator 101 , and to connect the compressor 105 to the outdoor condenser 103 .

[0097] In actual applications, 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 allows the refrigerant to enter the outdoor condenser 103 after coming out of the compressor 105, and then throttle and reduce the pressure through the electronic expansion valve 102, and then enter the indoor evaporator 101. The refrigerant condenses in the outdoor condenser 103 and releases heat to the outdoor air. The refrigerant evaporates in the indoor evaporator 101, absorbs the heat of the indoor air, and makes the indoor air cooler.

[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 first enters the indoor evaporator 101 after coming out of the compressor 105, and then throttles and reduces the pressure through the electronic expansion valve 102, and then enters the outdoor condenser 103. The refrigerant evaporates in the outdoor condenser 103, absorbs the heat of the outdoor air, and makes the outdoor air cooler. The refrigerant condenses in the indoor evaporator 101, releases heat to the indoor air, and warms the indoor air.

[0100] The four-way valve 110 is generally composed of a valve body, an electromagnetic coil, and a valve core. The valve body includes multiple channels and a valve core for controlling the flow direction of the refrigerant. The electromagnetic coil drives the valve core to move by receiving a control signal to change 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 cooling mode, the solenoid 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 along the path of the heating mode.

[0103] For example, Figure 2 As shown, when the air-conditioning system 10 is in the heating mode, the control device 106 can control the electromagnetic control valve 104 to close; 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 via the four-way valve 110.

[0104] like Figure 3As shown, when the air conditioning system 10 is in the cooling mode or the defrosting 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 and 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 and the four-way valve 110 .

[0106] Based on the air conditioning system mentioned in the above embodiment, the embodiment of the present invention also provides a method for clearing oil blockage, which can be applied to the air conditioning system mentioned in the above embodiment. Figure 4 , Figure 4 A flow chart showing the steps of a method for unblocking an oil blockage according to an embodiment of the present invention is shown.

[0107] like Figure 4 As shown, the method for clearing the oil blockage may include the following steps:

[0108] Step 401: Determine whether oil blockage occurs in the electronic expansion valve according to the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve.

[0109] In the embodiment of the present invention, 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 switches from the heating mode to the defrosting mode or the cooling mode, the low-temperature, liquid coolant output by the outdoor condenser will enter the indoor evaporator through the electronic expansion valve. In this process, the low-temperature, liquid coolant may be blocked in the electronic expansion valve, thereby affecting the operation of the air conditioning system.

[0110] In order to prevent the electronic expansion valve from being blocked by oil and affecting the operation of the air-conditioning system, an additional branch is provided in the air-conditioning system in the embodiment of the present invention, which can directly deliver the high-pressure and high-temperature refrigerant output by the compressor to the electronic expansion valve, thereby clearing the electronic expansion valve that is blocked by oil through the high-temperature and high-pressure refrigerant.

[0111] Specifically, the inlet end of the electromagnetic control valve can be connected to the outlet end of the compressor, and the outlet end of the electromagnetic control valve can be connected to the electronic expansion valve; thus, when the electronic expansion valve needs to be unblocked, the control device can control the electromagnetic control valve to open, and the high-temperature, high-pressure refrigerant output by the compressor can be output to the outdoor condenser on the one hand, and enter the electronic expansion valve through the outdoor condenser; on the other hand, the high-temperature, high-pressure refrigerant output from the compressor can also directly enter the electronic expansion valve through the electromagnetic control valve. Compared with the coolant that enters the electronic expansion valve through the outdoor condenser, the refrigerant that flows through the electromagnetic control valve has a shorter path and does not undergo heat exchange and pressure reduction, so its temperature and pressure are higher, which can effectively unblock the electronic expansion valve that is blocked by oil.

[0112] Exemplarily, the solenoid control valve is in a closed state by default; when the control device detects that the electronic expansion valve is blocked by oil, it can first open the solenoid control valve; after the solenoid control valve is opened, the control device can control the high-temperature, high-pressure refrigerant output by the compressor to enter the outdoor condenser and the solenoid control valve respectively; the refrigerant entering the outdoor condenser and the solenoid control valve respectively will enter the electronic expansion valve via the outdoor condenser and the solenoid control valve, thereby achieving unblocking of the electronic expansion valve.

[0113] In some feasible embodiments, the control device can obtain the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve after the air-conditioning system switches from the heating mode to the defrost mode or the cooling mode and runs for a period of time; wherein the outlet of the electronic expansion valve can be the 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 begun to be oil blocked according to the first pressure value and the first outdoor temperature.

[0115] Step 402: When the electronic expansion valve is blocked by 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.

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

[0117] In some feasible embodiments, the control device can obtain the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve after the air-conditioning system switches from the heating mode to the defrost mode or the cooling mode and runs for a period of time.

[0118] Then, the control device can analyze whether the electronic expansion valve has begun to be blocked by oil 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 the first preset temperature value, and whether the first pressure value is lower than the first preset pressure value. The first preset temperature value and the first preset pressure value can be set according to actual conditions, and the embodiment of the present invention does not impose specific restrictions on this.

[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 by oil; at this time, the control device can control the solenoid control valve to open, and control the high-temperature and high-pressure refrigerant output by the compressor to enter the outdoor condenser and the solenoid control valve respectively; the refrigerant entering the outdoor condenser and the solenoid control valve respectively will enter the electronic expansion valve via the outdoor condenser and the solenoid control valve, thereby achieving unblocking of the electronic expansion valve.

[0120] In some feasible embodiments, in order to detect whether the unblocking is completed, the control device can re-obtain the current second outdoor temperature and the current second pressure value at the outlet of the electronic expansion valve after opening the electromagnetic control valve for a first preset time.

[0121] Then, the control device can detect whether the electronic expansion valve has been unblocked 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 current second pressure value at the outlet of the electronic expansion valve is not lower than the second preset pressure value, the control device can determine that the oil blockage of the electronic expansion valve has been cleared; at this time, the control device can close the solenoid control valve to normally operate the outdoor condenser, indoor evaporator, electronic expansion valve and 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 current second pressure value at the outlet 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 unblocking; at this time, the electromagnetic control valve can continue to be maintained open, or the opening degree of the electromagnetic control valve can be increased, and the embodiment of the present invention does not limit this.

[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 be determined 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 after the electronic expansion valve is fully opened, the control device can detect whether the absolute value of the pressure difference between the electronic inlet end and the outlet end of the electronic expansion valve is lower than a third preset pressure value. The inlet end of the electronic expansion valve can be an end of the electronic expansion valve away 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] Otherwise, the control device can determine that the oil blockage of the electronic expansion valve has not been cleared.

[0128] In some feasible embodiments, the control device may determine that there is a fault in the electronic expansion valve when it determines that the absolute value of the pressure difference is not lower than a third preset pressure value; at this time, the control device may issue a fault prompt for the electronic expansion valve; illustratively, the control device may display the electronic expansion valve fault code on the indoor unit, or may send a fault prompt message to a user mobile device (for example, a mobile phone, etc.) connected to the air-conditioning system so that the user's mobile device may issue a fault prompt for the electronic expansion valve. The embodiments of the present invention are not limited to this.

[0129] For example, Figure 5 As shown, when the air conditioner is running in heating mode and receives a command to defrost or switch to cooling mode, the current outdoor ambient temperature T 外环 (first outdoor temperature) and the first pressure value P1; after the compressor runs 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 yes, it is predicted that oil blockage may or has occurred. The solenoid control valve is opened to open the passage for a period of time t2. During this period, it is monitored whether the following conditions are met:

[0131] T 外环 ≥T 设 , and / or P1 ≥ P 设2If yes, it indicates that the oil blockage fault has been eliminated. Close the electromagnetic control valve and the system continues to operate in normal defrosting or refrigeration mode. Otherwise, it indicates that the electronic expansion valve may have an opening and closing fault. Stop the compressor and set the opening of the electronic expansion valve to the maximum. After 60 seconds, determine whether the system parameters meet the following conditions: |P1-P2|<P 设3 If yes, it indicates that the expansion valve is unblocked. Otherwise, it indicates that the valve is faulty. The system shuts down and displays the expansion valve fault code on the indoor unit.

[0132] Where: 1. Compressor preset running time t1 = 1 / 4t 化 ;

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

[0134] 3. Taking a 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 diameter of the solenoid control valve shall not exceed 1 / 3 of the main pipeline.

[0137] In the embodiment of the present invention, it is determined whether the electronic expansion valve is blocked by oil according to the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve; when the electronic expansion valve is blocked by 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 enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively. Through the embodiment of the present invention, it is possible to avoid the problems of compressor idling, capacity and power reduction, oil shortage, etc. in the air-conditioning system caused by the blockage of the electronic expansion valve.

[0138] It should be noted that, for the sake of simplicity, the method embodiments are described as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present invention are not limited by the order of the actions described, because according to the embodiments of the present invention, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

[0139] Reference Figure 6 , showing a schematic structural diagram of an oil blockage clearing device according to an embodiment of the present invention, which can be applied to the air-conditioning system mentioned in the above embodiment.

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

[0141] The judging module 601 is used to judge whether the electronic expansion valve is blocked by oil according to 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 electromagnetic control valve when the electronic expansion valve is blocked by oil, so as 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.

[0143] In the embodiment of the present invention, it is determined whether the electronic expansion valve is blocked by oil according to the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve; when the electronic expansion valve is blocked by 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 enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively. Through the embodiment of the present invention, it is possible to avoid the problems of compressor idling, capacity and power reduction, oil shortage, etc. in the air-conditioning system caused by the blockage of the electronic expansion valve.

[0144] An embodiment of the present invention further provides an electronic device, including 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 above-mentioned method for unblocking oil blockage is implemented.

[0145] An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned method for unblocking oil blockage is implemented.

[0146] As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

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

[0148] Those skilled in the art will appreciate that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0149] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0150] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0151] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0152] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0153] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0154] The above provides a detailed introduction to an air-conditioning system, a method for unblocking an oil blockage, a device for unblocking an oil blockage, an electronic device and a computer-readable storage medium. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for a person skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An air conditioning system, characterized in that: 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 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; The other end of the outdoor condenser is connected to the other end of the indoor evaporator through the electronic expansion valve, and the outlet end of the electromagnetic control valve is connected to the other end of the indoor evaporator through the electronic expansion valve; The control device is used to open the electromagnetic control valve when oil blockage occurs in the electronic expansion valve; 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.

2. The air conditioning system according to claim 1, characterized in that: The control device is used to determine whether the electronic expansion valve is oil-blocked according to the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve.

3. The air conditioning system according to claim 2, characterized in that: The control device is used 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 oil blocked.

4. The air conditioning system according to claim 2, characterized in that: The control device is also used to determine that the oil blockage of the electronic expansion valve is cleared 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 of the electronic expansion valve is not lower than the second preset pressure value after the electromagnetic control valve is opened for a first preset time.

5. The air conditioning system according to claim 4, characterized in that: The control device is also used to determine that the oil blockage of the electronic expansion valve has not been cleared when the current 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 is lower than the second preset pressure value; when it is determined that the oil blockage of the electronic expansion valve has not been cleared, fully open the electronic expansion valve, and after a second preset time, 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 the third preset pressure value, it is determined that the oil blockage of the electronic expansion valve has been cleared.

6. The air conditioning system according to claim 5, characterized in that: The control device is further used to determine that there is a fault in the electronic expansion valve when the absolute value of the pressure difference is not lower than the third preset pressure value; and to provide a fault prompt for the electronic expansion valve.

7. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises: An outdoor fan is used to adjust the temperature of the outdoor condenser.

8. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises: A first pressure sensor, used for detecting the pressure at one end of the electronic expansion valve away from the indoor evaporator; The second pressure sensor is used to detect the pressure at one end of the electronic expansion valve close to the indoor evaporator.

9. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises: The four-way valve is used for connecting the compressor with the indoor evaporator and the compressor with the outdoor condenser.

10. A method for clearing oil blockage, characterized in that: Applied to the air conditioning system according to any one of claims 1 to 9, the method comprises: According to the current first outdoor temperature and the current first pressure value at the outlet of the electronic expansion valve, determining whether the electronic expansion valve is oil blocked; When the electronic expansion valve is blocked by 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 enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

11. An oil blockage dredging device, characterized in that: Applicable to the air conditioning system according to any one of claims 1 to 9, the device comprising: A judgment module, used for judging 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 of the electronic expansion valve; The unblocking module is used to open the electromagnetic 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 electromagnetic control valve respectively, and enter the electronic expansion valve through the outdoor condenser and the electromagnetic control valve respectively.

12. An electronic device, characterized in that: The method comprises a processor, a memory and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the method for unblocking oil blockage as claimed in claim 10.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for unblocking oil blockage as claimed in claim 10 is implemented.

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