Refrigerant migration control method, air conditioning system, storage medium and electronic device

Abstract

The invention discloses a refrigerant migration control method, an air conditioning system, a storage medium and an electronic device, the method is applied to the air conditioning system, an inlet of a one-way valve in the air conditioning system is connected with an exhaust port of a compressor, and a pipeline through which a refrigerant flows from an outlet of the one-way valve to an inlet of a throttling component in the air conditioning system is a high-pressure pipeline. A pipeline from an outlet of a throttling component to an air return port of a compressor is a low-pressure pipeline, and the method comprises the steps that after it is determined that the compressor needs to be stopped and before the compressor is started next time, values of preset operation parameters in the air conditioning system are obtained multiple times; and the refrigerant amount in the high-pressure pipeline is controlled according to the values of the operation parameters, so that the pressure value in the high-pressure pipeline is within a preset safety range, and the problem that refrigerant backflow is blocked at the moment of shutdown in the air conditioning system, and consequently refrigerant accumulation on the high-pressure side is caused is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to air conditioning system technology, and in particular to a refrigerant migration control method, an air conditioning system, a storage medium and an electronic device. BACKGROUND

[0002] In the field of air conditioning technology, when a single cold air conditioning system operates in a high-temperature environment, refrigerant management is difficult, and refrigerant is prone to accumulate on the high-pressure side, resulting in a slow refrigerant migration process when starting again, causing start-up delay and performance decline. When a heat pump air conditioning system stops, the refrigerant distribution is not reasonable, and part of the refrigerant is retained on the low-pressure side. When starting again, the compressor needs to first migrate the low-pressure side refrigerant to the high-pressure side, which takes time and may cause insufficient initial heating capacity, affecting user comfort experience. In addition, existing air conditioning systems lack effective refrigerant migration control methods, and cannot accurately regulate refrigerant distribution during shutdown and startup, making it difficult to prevent high-pressure protection problems and affecting system stable operation and component life. Therefore, there is an urgent need for a technical solution that can optimize refrigerant distribution, accelerate the migration process, and ensure stable startup and operation of the system to improve air conditioning performance and user experience. SUMMARY

[0003] The embodiments of the present application provide a refrigerant migration control method, an air conditioning system, a storage medium and an electronic device.

[0004] A refrigerant migration control method applied to an air conditioning system, the air conditioning system comprising a compressor, a one-way valve, an external heat exchanger, an internal heat exchanger, and a throttling component arranged between the external heat exchanger and the internal heat exchanger, wherein the inlet of the one-way valve is connected to the exhaust port of the compressor, wherein the pipe through which the refrigerant in the air conditioning system flows from the outlet of the one-way valve to the inlet of the throttling component is a high-pressure pipe, and the pipe through which the refrigerant flows from the outlet of the throttling component to the return port of the compressor is a low-pressure pipe, the method comprising: After determining that the compressor needs to be stopped, multiple times of obtaining the value of a preset operating parameter in the air conditioning system before the next startup of the compressor; Controlling the amount of refrigerant in the high-pressure pipe according to the value of the operating parameter, so that the pressure value in the high-pressure pipe is within a preset safe range.

[0005] For example, the method of controlling the amount of refrigerant in the high-pressure pipe according to the value of the operating parameter comprises: in response to the value of the operating parameter obtained this time meeting a preset high-pressure danger condition, controlling part of the refrigerant in the high-pressure pipe to migrate to the low-pressure pipe.

[0006] The multiple acquisition of the preset operating parameter values in the air conditioning system includes: in a process of performing a stoppage refrigerant migration operation after determining that the compressor needs to be stopped, the operating parameters are acquired at preset time intervals; The control of the amount of refrigerant in the high-pressure pipeline according to the operating parameter values includes: In the stoppage refrigerant migration operation, in response to the operating parameter values at the current time interval satisfying a preset high-pressure danger condition, the compressor is stopped, and the stoppage refrigerant migration operation is terminated.

[0007] The control of the amount of refrigerant in the high-pressure pipeline according to the operating parameter values includes: In the stoppage refrigerant migration operation, in response to the operating parameter values at the current time interval satisfying a preset high-pressure danger condition, a first pressure equalization signal is sent to control the opening degree of the throttling component to increase to a first set value, so that the refrigerant in the high-pressure pipeline migrates to the low-pressure pipeline; and In response to the pressure value in the high-pressure pipeline being in the safety range, the throttling component is closed.

[0008] The multiple acquisition of the preset operating parameter values in the air conditioning system includes: in a process of performing a stoppage refrigerant migration operation after determining that the compressor needs to be stopped, the operating parameters are acquired at preset time intervals; The control of the amount of refrigerant in the high-pressure pipeline according to the operating parameter values includes: In the stoppage refrigerant migration operation, in response to the operating parameter values at the current time interval satisfying a preset high-pressure danger condition, a first pressure equalization signal is sent to control the opening degree of the throttling component to increase to a first set value, so that the refrigerant in the high-pressure pipeline migrates to the low-pressure pipeline; and In response to the pressure value in the high-pressure pipeline being in the safety range, the throttling component is closed.

[0009] The multiple acquisition of the preset operating parameter values in the air conditioning system includes: in a process of performing a stoppage refrigerant migration operation after determining that the compressor needs to be stopped, the operating parameters are acquired at preset time intervals; The control of the amount of refrigerant in the high-pressure pipeline according to the operating parameter values includes: In the stoppage refrigerant migration operation, in response to the operating parameter values at the current time interval satisfying a preset high-pressure danger condition, a first pressure equalization signal is sent to control the opening degree of the throttling component to increase to a first set value, so that the refrigerant in the high-pressure pipeline migrates to the low-pressure pipeline; and adjusting the opening degree of the throttling component to a preset opening degree at normal start-up, and starting the compressor.

[0010] Exemplarily, the preset operating parameters include at least one of an ambient temperature value, an outlet-side pressure value of the check valve, a supercooling degree, and a subcooling coefficient value. When the acquired value meets any one of the following conditions, it is determined that the high-pressure dangerous condition is met: the ambient temperature value meets a preset temperature abnormality condition; the outlet-side pressure value of the check valve is greater than or equal to a preset pressure threshold value; the supercooling degree is greater than or equal to a preset supercooling degree threshold value, wherein the supercooling degree is obtained according to a difference between a saturation temperature corresponding to a condensing pressure and a condenser outlet temperature value in the air conditioning system; the subcooling coefficient value is greater than or equal to a preset subcooling coefficient threshold value.

[0011] Exemplarily, the subcooling coefficient value is a ratio between the supercooling degree and a first difference value, wherein the first difference value is a difference between a saturation temperature corresponding to the condensing pressure and the ambient temperature.

[0012] A storage medium having a computer program stored therein, wherein the computer program is configured to execute the method described above when running.

[0013] An electronic device comprising a memory and a processor, characterized in that the memory has a computer program stored therein, and the processor is configured to execute the computer program to perform the method described above.

[0014] An air conditioning system comprising the electronic device described above, a compressor, a check valve, an external heat exchanger, an internal heat exchanger, and a throttling component arranged between the external heat exchanger and the internal heat exchanger, wherein an inlet of the check valve is connected to a discharge port of the compressor, and the electronic device is configured to perform refrigerant migration control.

[0015] Exemplarily, the air conditioning system further comprises: a four-way valve having a C port, a D port, an E port, and an S port, wherein the D port is connected to the check valve outlet, the C port is connected to the external heat exchanger, the E port is connected to the internal heat exchanger, and the S port is connected to a suction port of the compressor.

[0016] The embodiment of the present application aims at the problem that the one-way valve in the air conditioning system will block the refrigerant return at the shutdown moment, causing the refrigerant accumulation on the high-pressure side. After determining that the compressor needs to be stopped, the values of the preset operating parameters in the air conditioning system are obtained multiple times before the next start of the compressor, and the refrigerant amount in the high-pressure pipeline is controlled according to the values of the operating parameters, so that the pressure value in the high-pressure pipeline is within the preset safety range, effectively avoiding the next start high-pressure protection problem caused by the unreasonable distribution of refrigerant at shutdown, improving the reliability of the air conditioning system, reducing the damage to the key components such as the compressor caused by frequent high-pressure protection shutdown, prolonging the service life of the air conditioning system; ensuring that the air conditioning system can start quickly and stably under various working conditions, even in the fast cooling or fast heating mode, it can still respond to the user's demand in time, improve the user's use experience, avoid the situation of start delay and performance decline, and is suitable for various complex environments and operating conditions, such as high temperature, multi-refrigerant air conditioning system, etc., enhancing the environmental adaptability and universality of the air conditioning system, so that the air conditioning system can stably operate in a wider range of scenes.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. Other advantages of the present application can be achieved and obtained by the solutions described in the specification and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are used to provide an understanding of the technical solutions of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solutions of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0019] Figure 1 It is a structural schematic diagram of a single-cooling air conditioning system; Figure 2 It is a structural schematic diagram of a heat pump air conditioning system; Figure 3 It is a flowchart of the refrigerant migration control method provided by the first embodiment of the present application; Figure 4 It is a flowchart of the refrigerant migration control method provided by the second embodiment of the present application; Figure 5 It is a flowchart of the refrigerant migration control method provided by the third embodiment of the present application; Figure 6 It is a flowchart of the refrigerant migration control method provided by the fourth embodiment of the present application; Figure 7 It is a schematic diagram of the sensor deployment position in the refrigeration mode of the heat pump air conditioning system provided by the embodiment of the present application. DETAILED DESCRIPTION

[0020] The present application describes a plurality of embodiments, but the description is exemplary rather than limiting, and it will be apparent to those of ordinary skill in the art that there can be many embodiments and implementations within the scope of the embodiments described in the present application. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Unless specifically intended to be limited, any feature or element of any embodiment can be used with any other feature or element of any other embodiment, or in any other embodiment, whether or not that feature or element is specifically disclosed in combination with the other feature or element. The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed herein can also be combined with any conventional features or elements to form unique inventive solutions. Any feature or element of any embodiment can also be combined with features or elements from other inventive solutions to form another unique inventive solution. Therefore, it should be understood that any feature shown and / or discussed in the present application can be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted, except as by the appended claims and their equivalents. Furthermore, various modifications and changes can be made within the scope of the appended claims.

[0021] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed herein can also be combined with any conventional features or elements to form unique inventive solutions. Any feature or element of any embodiment can also be combined with features or elements from other inventive solutions to form another unique inventive solution. Therefore, it should be understood that any feature shown and / or discussed in the present application can be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted, except as by the appended claims and their equivalents. Furthermore, various modifications and changes can be made within the scope of the appended claims.

[0022] Furthermore, in describing representative embodiments, the specification can have presented the method and / or process as a particular sequence of steps. However, to the extent that the method or process depends on more than one step, the method or process should not be construed as limited to the particular sequence of steps described. Other sequences of steps can also be possible. The specific

[0023] Figure 1 The structure diagram of the single cold air conditioning system. As shown in Figure 1 The single cold air conditioning system includes a compressor 1, a one-way valve 2, an external heat exchanger 4, at least two internal heat exchangers 81 / 82, a throttling component, wherein the throttling component corresponds to Figure 1 the external machine throttling valve 6 and the internal machine throttling valve 71 / 72, in addition, the external machine fan 5 and the internal machine fan 91 / 92 corresponding to the internal heat exchanger can also be deployed. Among them: Compressor 1: as the core power source of air conditioning system, responsible for sucking low-temperature and low-pressure gaseous refrigerant and compressing it to convert it into high-temperature and high-pressure gaseous refrigerant and discharge it.

[0024] One-way valve 2: the inlet is connected to the compressor 1 exhaust port, the outlet is connected to the external heat exchanger. Its function is to allow the refrigerant to flow to the external heat exchanger in one direction when the compressor 1 is working, and to prevent the refrigerant from flowing back to the low-pressure side after the compressor 1 stops working, thereby shortening the refrigerant migration time when the system starts next time, achieving the effect of quick cooling and quick heating; at the same time, the system can quickly reach the supercooling degree, and the noise of the refrigerant flowing through the throttling component during the starting stage can be reduced. However, too much refrigerant accumulates on the high-pressure side, which may cause the pressure on the high-pressure side to rise sharply during startup, thereby triggering the high-pressure protection mechanism, which is more obvious under high ambient temperature conditions.

[0025] External heat exchanger 4: usually installed outdoors, exchanges heat with the external environment through an external fan. In cooling mode, high-temperature and high-pressure gaseous refrigerant flows out of the one-way valve 2 and enters the external heat exchanger 4, releasing heat to the outside environment and condensing into high-temperature and high-pressure liquid refrigerant.

[0026] Throttling component (throttle valve): connected to the external heat exchanger 4 and the internal heat exchanger, throttles and depressurizes the high-temperature and high-pressure liquid refrigerant flowing out of the external heat exchanger 4, and changes it into low-temperature and low-pressure liquid refrigerant.

[0027] Internal heat exchanger 81 / 82: installed indoors, exchanges heat with indoor air through an internal fan. The low-temperature and low-pressure liquid refrigerant absorbs heat from indoor air in the internal heat exchanger 81 / 82 and evaporates into low-temperature and low-pressure gaseous refrigerant, achieving the effect of cooling.

[0028] In cooling mode Figure 1 The flow direction of the refrigerant in the air conditioning system is as follows: Compressor 1: low-temperature and low-pressure gaseous refrigerant is sucked into and compressed by the compressor 1, and is discharged as high-temperature and high-pressure gaseous refrigerant.

[0029] One-way valve 2: high-temperature and high-pressure gaseous refrigerant flows from the compressor 1 exhaust port through the one-way valve 2 to the external heat exchanger 4.

[0030] External heat exchanger 4 (condenser): refrigerant flows out of the one-way valve 2 outlet and enters the external heat exchanger 4, where the high-temperature and high-pressure gaseous refrigerant releases heat to the external environment and gradually condenses into high-temperature and high-pressure liquid refrigerant.

[0031] Throttling component: high-temperature and high-pressure liquid refrigerant flows through the external machine throttle valve 6 and the internal machine throttle valve 71 / 72 in turn. At the external machine throttle valve 6, the refrigerant begins to throttle and depressurize, but still maintains a relatively high temperature; then enters the internal machine throttle valve 71 / 72, further throttles and depressurizes, and the temperature also decreases accordingly, becoming low-temperature and low-pressure liquid refrigerant.

[0032] The inner heat exchanger 81 / 82 (evaporator): After the low-temperature and low-pressure liquid refrigerant flows out of the throttling component, it enters the inner heat exchanger 81 / 82, where it absorbs the heat of the indoor air and evaporates into low-temperature and low-pressure gaseous refrigerant.

[0033] The compressor 1 return port: After the low-temperature and low-pressure gaseous refrigerant flows out of the inner heat exchanger 81 / 82, it returns to the compressor 1 return port through the return pipe, completing a refrigeration cycle.

[0034] In the refrigeration mode of the single-cooling air conditioning system, the high-pressure pipeline is the pipeline between the outlet of the one-way valve 2 and the outlet of the outdoor throttling valve 6. The refrigerant in this pipeline is in a high-temperature and high-pressure state, and it is a key part of the high-pressure side of the air conditioning system. Its pressure level directly affects the stable operation of the air conditioning system and the triggering of the high-pressure protection mechanism. The low-pressure pipeline is the pipeline between the inner machine throttling valve 71 / 72 and the return port of the compressor 1.

[0035] In actual application, Figure 1 The single-cooling air conditioning system is widely used in places that require refrigeration in summer, such as homes and offices. Especially in high-temperature environments, such as outdoor temperatures in southern China reaching above 40°C in summer, refrigerant management is particularly important for air conditioning systems. When the traditional single-cooling air conditioning system is shut down, due to the blocking effect of the one-way valve 2, a large amount of refrigerant tends to accumulate on the high-pressure side (the outer heat exchanger 4 and the connected pipeline), forming a so-called "high-pressure island". When the air conditioning system is started again, the starting impact pressure of the compressor 1 is superimposed on the original high-pressure side refrigerant pressure, which can easily cause the air conditioning system pressure to instantaneously exceed the safety threshold, triggering the high-pressure protection mechanism and affecting the normal use of the air conditioning system. Frequent high-pressure protection can also cause damage to key components such as the compressor 1 and the pipeline, reducing the service life of the air conditioning system. In addition, in some multi-refrigerant air conditioning systems or complex operating conditions of air conditioning systems, the distribution and migration of refrigerant are more difficult to control, further increasing the risk of high-pressure protection.

[0036] Figure 2 A schematic diagram of a heat pump air conditioning system is shown. As Figure 2 shown, the heat pump air conditioning system includes a compressor 1, a one-way valve 2, an outer heat exchanger 4, at least two inner heat exchangers 81 / 82, a throttling component, and a four-way valve 3. The throttling component corresponds to Figure 2 the outdoor throttling valve 6 and the inner machine throttling valve 71 / 72, and in addition, an outdoor fan 5 and an inner machine fan 91 / 92 corresponding to the inner heat exchanger can also be deployed. Among them: Four-way valve 3: As a key component of the heat pump air conditioning system, it has C port, D port, E port and S port. The specific connection relationship is: D port connects the outlet of one-way valve 2, C port connects the external heat exchanger 4, E port connects the internal heat exchanger 81 / 82, and S port connects the return gas port of compressor 1. In the cooling mode, Figure 2 The flow direction of the refrigerant of the heat pump air conditioning system is shown as follows: Compressor 1: The low-temperature and low-pressure gaseous refrigerant is sucked into and compressed by the compressor 1, and is discharged from the exhaust port of the compressor 1 after being converted into high-temperature and high-pressure gaseous refrigerant.

[0037] One-way valve 2: The inlet is connected with the exhaust port of the compressor 1, and the outlet is connected with the external heat exchanger. Its function is to allow the refrigerant to flow to the external heat exchanger in one direction when the compressor 1 is working, and to prevent the refrigerant from flowing back to the low-pressure side after the compressor 1 stops working, thereby shortening the refrigerant migration time when the system starts next time, achieving the effect of quick cooling and quick heating; at the same time, the system can quickly output supercooling degree, which can reduce the noise of the refrigerant flowing through the throttling component during the starting stage. However, too much refrigerant accumulated on the high-pressure side may cause the pressure on the high-pressure side to rise sharply during starting, thereby triggering the high-pressure protection mechanism to start, which is more obvious under high ambient temperature conditions.

[0038] Four-way valve 3: In the power-off state, D port and C port are connected, so that the refrigerant can flow between the compressor 1, the external heat exchanger 4 and other components according to the refrigeration cycle path.

[0039] External heat exchanger 4: After passing through the D port and C port of the four-way valve 3, the refrigerant enters the external heat exchanger 4. In the external heat exchanger 4, the high-temperature and high-pressure gaseous refrigerant releases heat to the external environment and gradually condenses into high-temperature and high-pressure liquid refrigerant, and the external heat exchanger 4 here plays the role of condenser.

[0040] Throttling component: The high-temperature and high-pressure liquid refrigerant successively flows through the outdoor unit throttling valve 6 and the indoor unit throttling valve 71 / 72. At the outdoor unit throttling valve 6, the refrigerant starts to throttle and reduce pressure, but still maintains a relatively high temperature; then enters the indoor unit throttling valve 71 / 72, further throttles and reduces pressure, and the temperature also decreases accordingly, becoming low-temperature and low-pressure liquid refrigerant.

[0041] Internal heat exchanger 81 / 82: After the low-temperature and low-pressure liquid refrigerant enters the internal heat exchanger 81 / 82, it absorbs the heat of indoor air and evaporates into low-temperature and low-pressure gaseous refrigerant, and at this time the internal heat exchanger 81 / 82 functions as an evaporator.

[0042] Compressor 1 return gas port: After the low-temperature and low-pressure gaseous refrigerant flows out of the internal heat exchanger 81 / 82, it returns to the return gas port of the compressor 1 through the related pipeline, completing a refrigeration cycle.

[0043] In the cooling mode, the high-pressure pipeline is the pipeline from the outlet of the one-way valve 2 to the outside machine throttling valve 6 through the external heat exchanger 4 (condenser). The refrigerant in this pipeline is in a high-temperature and high-pressure state, which is the key part of the high-pressure side of the air conditioning system. The pressure level has a direct impact on the stable operation of the air conditioning system and the triggering of the high-pressure protection mechanism. The low-pressure pipeline is the pipeline from the inside machine throttling valve 71 / 72 to the compressor 1 return port through the inside heat exchanger 81 / 82 (evaporator).

[0044] In the heating mode Figure 2 The refrigerant flow direction of the heat pump air conditioning system is as follows: Compressor 1: The low-temperature and low-pressure gaseous refrigerant enters the compressor 1 and is compressed to become high-temperature and high-pressure gaseous refrigerant.

[0045] One-way valve 2: After the high-temperature and high-pressure gaseous refrigerant flows out of the compressor 1 exhaust port, it passes through the one-way valve 2 to the external heat exchanger 4.

[0046] Four-way valve 3: When powered on, the D port and the E port are connected, and the refrigerant enters the inside heat exchanger 81 / 82 through the D port and the E port of the four-way valve 3.

[0047] Inside heat exchanger 81 / 82: The high-temperature and high-pressure gaseous refrigerant releases heat to the indoor air and condenses into high-temperature and high-pressure liquid refrigerant. The inside heat exchanger 81 / 82 functions as a condenser in the heating mode.

[0048] Throttling component: The high-temperature and high-pressure liquid refrigerant flows through the inside machine throttling valve 71 / 72 and the outside machine throttling valve 6 in sequence. At the inside machine throttling valve 71 / 72, the temperature drops after throttling and pressure reduction; when it continues to flow through the outside machine throttling valve 6, it is further throttled and pressure reduced to become low-temperature and low-pressure liquid refrigerant.

[0049] External heat exchanger 4: The low-temperature and low-pressure liquid refrigerant enters the external heat exchanger 4 and absorbs heat from the external environment to evaporate into low-temperature and low-pressure gaseous refrigerant. The external heat exchanger 4 functions as an evaporator in this process.

[0050] Compressor 1 return port: The low-temperature and low-pressure gaseous refrigerant flows out of the external heat exchanger 4 and returns to the compressor 1 return port through the corresponding pipeline, completing the heating cycle.

[0051] In the heating mode, the high-pressure pipeline is the pipeline from the outlet of the one-way valve 2 to the inside machine throttling valve 71 / 72 through the inside heat exchanger 81 / 82 (condenser). The refrigerant in this pipeline is also in a high-temperature and high-pressure state, and it carries out the key task of releasing heat to the room. Its pressure condition is of great significance to the heating effect and the safe operation of the air conditioning system. The low-pressure pipeline is the pipeline from the outside machine throttling valve 6 to the compressor 1 return port through the external heat exchanger 4 (evaporator).

[0052] In actual application,Figure 2 The illustrated heat pump air conditioning system faces diverse working condition challenges. Especially in high-temperature environments, such as summer outdoor temperatures reaching 40°C or above, or in some special places such as greenhouses, machine rooms, etc., the refrigerant management of the air conditioning system is particularly important. When the traditional air conditioning system is shut down, due to the blocking effect of the one-way valve 2, the refrigerant is easily accumulated in large quantities on the high-pressure side, forming a so-called "high-pressure island". When the air conditioning system is started again, the starting impact pressure of the compressor 1 is superimposed on the original high-pressure side refrigerant pressure, which is extremely easy to cause the air conditioning system pressure to break through the safety threshold instantaneously, triggering the high-pressure protection mechanism, not only affecting the normal use of the air conditioning system, but also the frequent high-pressure protection may cause damage to the compressor 1, piping and other key components, reducing the service life of the air conditioning system. In addition, in some multi-refrigerant air conditioning systems or air conditioning systems with complex and variable operating conditions, the distribution and migration of refrigerant are more difficult to control, further exacerbating the risk of high-pressure protection.

[0053] The heat pump air conditioning system not only needs to meet the refrigeration demand, but also needs to provide rapid heating function in winter. Especially in cold regions, such as northern winter outdoor temperatures can reach -10°C or below, indoor users have very high requirements for the heating speed and effect of the heat pump air conditioning system. If the heat pump air conditioning system does not reasonably control the refrigerant when it is shut down, the refrigerant migration process is slow when it is started again, which will cause the heating effect to be delayed and unable to quickly meet the user's demand for a warm indoor environment.

[0054] The traditional heat pump air conditioning system, when shut down, the refrigerant distribution is not reasonable, part of the refrigerant may be retained in the low-pressure side (such as the inner heat exchanger 81 / 82 and the connected pipeline). When heating is started again, the compressor 1 needs to first migrate the refrigerant on the low-pressure side to the high-pressure side, which not only takes a long time, but also may cause the initial heating capacity of the air conditioning system to be insufficient, affecting the user's comfort experience. At the same time, in low-temperature environments, the refrigerant migration efficiency is further reduced, exacerbating the heating delay problem.

[0055] Based on the above analysis, during shutdown, there are two high and low pressure areas in the air conditioning system: the high pressure pipeline and the low pressure pipeline. The high pressure pipeline is the pipeline through which the refrigerant flows from the outlet of the check valve 2 to the inlet of the throttling component, while the low pressure pipeline is the pipeline through which the refrigerant flows from the outlet of the throttling component to the suction port of the compressor. If no measures are taken to control the distribution of refrigerant during shutdown, the refrigerant in the high pressure pipeline may not be able to flow back to the low pressure pipeline in time due to the blockage of the check valve 2, resulting in excessively high pressure in the high pressure pipeline. When the ambient temperature is high, the expansion effect of the refrigerant will further increase the pressure in the high pressure pipeline, thereby increasing the risk of triggering high pressure protection during the next start-up. Therefore, the refrigerant migration control method proposed in the embodiments of the present application can obtain operating parameters during the key time period after performing the shutdown refrigerant migration operation and before start-up, and take measures to reduce the amount of refrigerant in the high pressure pipeline according to high pressure hazard conditions, effectively preventing high pressure protection problems and ensuring that the air conditioning system can operate stably, efficiently and safely under various complex working conditions, thereby improving the performance and user experience of the air conditioning system product.

[0056] Embodiment one Figure 3 A flowchart of the refrigerant migration control method provided by the first embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the method comprises the following steps. Figure 3 Step 101: After determining that the compressor needs to be stopped, multiple values of a preset operating parameter in the air conditioning system are obtained before the next start-up of the compressor.

[0057] If the distribution of refrigerant is unreasonable during shutdown of the air conditioning system, it may cause the compressor load to be too large during the next start-up, affecting the stability of the start-up and operation. By performing a shutdown refrigerant migration operation (i.e., performing a shutdown refrigerant migration operation after receiving a signal to stop the compressor), the refrigerant is controlled to be reserved in the high pressure pipeline, which can reduce the amount of refrigerant in the low pressure pipeline and the evaporator, avoid the accumulation of refrigerant in the evaporator and other components, and prevent the evaporator pressure from being too low due to excessive refrigerant, thereby affecting the balance of the air conditioning system and the performance of the next start-up.

[0058] Among them, the time period after determining that the compressor needs to be stopped to the next start-up of the compressor is because the air conditioning system is in a temporary non-operating state at this time, but it is close to the next start-up. During this time period, the refrigerant distribution state is relatively stable, and the air conditioning system pressure and other parameters are also in a controllable window period. At this time, the operating parameters are obtained, which can accurately capture the initial state of the refrigerant distribution and the air conditioning system pressure at the moment of shutdown, and make a good prediction and preparation for the next start-up, so as to avoid directly triggering high pressure protection due to unreasonable refrigerant distribution at the moment of start-up.

[0059] ​The time period is selected based on the natural connection point of the air conditioning system operation cycle, which does not interfere with the normal operation of this time, and can maximize the smooth progress of the next start.

[0060] Specifically, if the operation parameter acquisition and refrigerant migration control are performed during the current operation, it may interfere with the normal refrigeration and heating effect of the air conditioning system, affecting the user experience. Selecting the "window period" operation from the execution of the shutdown refrigerant migration operation to the next start of the compressor can ensure that the air conditioning system works normally according to the established mode during operation, and is not affected by the refrigerant migration control process, realizing seamless connection of refrigerant management and air conditioning system operation.

[0061] Among them, the operation parameter is used to evaluate the distribution of the refrigerant after the start of the shutdown refrigerant migration operation, to determine whether too much refrigerant is retained on the high-pressure side. For example, by monitoring the high-pressure pipeline pressure, supercooling degree and other parameters, the accumulation degree of high-pressure side refrigerant can be indirectly understood, and it can be determined whether there is a risk of excessive accumulation of refrigerant. In addition, these parameters can predict whether the high-pressure protection mechanism may be triggered next time the compressor. If there is too much refrigerant on the high-pressure side after shutdown, the impact pressure of the compressor and the high-pressure side refrigerant pressure are superimposed when starting again under harsh conditions such as high temperature, which is easy to break through the high-pressure protection threshold set by the air conditioning system, resulting in the air conditioning system cannot start normally. The operation parameter can discover this potential risk in advance, and provide a basis for taking appropriate refrigerant migration control measures.

[0062] Step 102, according to the value of the operation parameter, control the amount of refrigerant in the high-pressure pipeline, so that the pressure value in the high-pressure pipeline is within the preset safe range.

[0063] For example, according to the value in the current time interval, it is judged whether the air conditioning system is currently in a high-pressure dangerous state. If the air conditioning system is not currently in a high-pressure dangerous state, the amount of refrigerant in the high-pressure pipeline does not need to be intervened; otherwise, the amount of refrigerant in the high-pressure pipeline is appropriately reduced, so that the pressure value in the high-pressure pipeline is within the safe range.

[0064] The method provided by the embodiment one of the application can effectively avoid the high-pressure protection problem caused by unreasonable distribution of refrigerant at the time of shutdown, improve the reliability of the air conditioning system, reduce the damage to the key components such as the compressor caused by frequent high-pressure protection shutdown, prolong the service life of the air conditioning system, ensure that the air conditioning system can start quickly and stably under various working conditions, even in the rapid cooling or rapid heating mode, and still respond to user demand in time, improve the user experience, avoid the situation of start delay and performance decline, and is suitable for various complex environments and operating conditions, such as high-temperature and multi-refrigerant air conditioning systems, thereby enhancing the environmental adaptability and universality of the air conditioning system and enabling the air conditioning system to stably operate in a wider range of scenarios.

[0065] For example, step 102 comprises: in response to the value of the obtained operating parameter meeting the preset high-pressure dangerous condition, controlling part of the refrigerant in the high-pressure pipeline to migrate to the low-pressure pipeline.

[0066] The high-pressure dangerous condition is a series of set determination criteria for determining whether the air conditioning system is in a high-pressure dangerous state. When the value of the operating parameter meets the high-pressure dangerous condition, it indicates that the current refrigerant distribution and pressure condition of the air conditioning system has approached or reached a critical point that may trigger the high-pressure protection mechanism. At this time, the air conditioning system needs to take measures to reduce the amount of refrigerant in the high-pressure pipeline to avoid triggering the high-pressure protection at the next start and ensure that the air conditioning system can operate normally. The high-pressure dangerous condition functions as a risk warning and triggering mechanism, which clearly specifies the conditions under which refrigerant migration control must be performed to ensure the safety and stability of the air conditioning system.

[0067] By controlling the migration of the refrigerant in the high-pressure pipeline to the low-pressure pipeline, the amount of refrigerant in the high-pressure pipeline is reduced, which can directly reduce the initial pressure on the high-pressure side. In the shutdown state, the less the amount of refrigerant on the high-pressure side, the lower the pressure. When the compressor starts next time, the total pressure peak after superimposing the discharge pressure of the compressor and the refrigerant pressure on the high-pressure side is relatively small, thereby avoiding exceeding the high-pressure protection threshold. In addition, when the compressor starts, there will be an instantaneous impact pressure. If the amount of refrigerant in the high-pressure pipeline has been reduced in advance, the impact of the impact pressure on the overall pressure of the air conditioning system will also be reduced, thereby reducing the probability of triggering high-pressure protection caused by pressure impact.

[0068] In this embodiment, the amount of refrigerant migrated to the low-pressure pipeline can be pre-set, such as setting a migration time of a predetermined length, or migrating a pre-set amount of refrigerant; or, the operating parameters can be monitored during the migration of refrigerant to the low-pressure pipeline, and the migration is stopped when the operating parameters no longer meet the pre-set high-pressure danger condition.

[0069] In other alternative embodiments, in step 102, it can be determined whether the value of the current time interval is outside the pre-set range, and if the value of one or more operating parameters is outside the pre-set range, the amount of refrigerant in the high-pressure pipeline is migrated to the low-pressure pipeline; or, other ways can be used to determine whether the value of the current time interval triggers refrigerant migration.

[0070] In other alternative embodiments, when controlling the amount of refrigerant in the high-pressure pipeline, the refrigerant in the high-pressure pipeline can be migrated to a position outside the low-pressure pipeline.

[0071] Embodiment Two Figure 4 The flowchart of the refrigerant migration control method provided in Embodiment Two of the present application is shown in FIG. 2. As shown in FIG. 2, the method comprises the following steps: Figure 4 Step 201, receiving a signal to stop the compressor.

[0072] When the current operation of the air conditioning system ends, the controller receives a signal to stop the compressor from the user operation panel, the remote control or the intelligent control module of the air conditioning system. This signal triggers the air conditioning system to enter the shutdown process, making preparations for subsequent refrigerant migration control, and marking the switching of the air conditioning system from normal operation mode to shutdown mode.

[0073] Step 202, sending an execution signal of the shutdown refrigerant migration operation.

[0074] The controller sends an execution signal of the shutdown refrigerant migration operation to perform the following operations: Keep the compressor on: the compressor continues to operate to provide power for refrigerant migration, allowing refrigerant to flow within the air conditioning system.

[0075] Control the opening of the throttling component to reduce to a fourth set value: by accurately controlling the opening of the throttling component (such as an electronic expansion valve), it is reduced to a pre-set fourth set value. This can increase the resistance on the high-pressure pipeline side, making the refrigerant more inclined to stay in the high-pressure pipeline, thereby achieving the purpose of controlling the refrigerant to be reserved in the high-pressure pipeline.

[0076] Step 203, determining whether the end condition of the shutdown refrigerant migration operation is met; ​If the end condition of the shutdown refrigerant migration operation is met, indicating that the air conditioning system ends the execution of the shutdown refrigerant migration operation, step 204 is performed; otherwise, the operations in steps 205 to 210 are performed.

[0077] For example, in the shutdown phase, the end condition of the shutdown refrigerant migration operation can be that the air conditioning system fails, a preset time threshold is reached, the high pressure of the air conditioning system meets a preset high pressure condition, or the low pressure of the air conditioning system reaches a preset low pressure condition. Specifically: Air conditioning system failure: During the shutdown refrigerant migration process, if the air conditioning system detects any abnormal condition, such as compressor failure, sensor failure, etc., the shutdown refrigerant migration operation should be stopped immediately to prevent the failure from further expanding and ensure the safety of the air conditioning system.

[0078] Reaching a preset time threshold: A reasonable time threshold is set. If the shutdown refrigerant migration is not completed within the time, it is considered that the migration process has a problem and the shutdown migration operation should be stopped. For example, if the preset time threshold is 3 minutes, if the migration is not completed within 3 minutes after the shutdown refrigerant migration starts, the migration is stopped.

[0079] High pressure of air conditioning system meets preset high pressure condition: If the high pressure value of the air conditioning system reaches the preset high pressure condition during the shutdown refrigerant migration process, for example, the high pressure value reaches 3.3 MPa (for R410A refrigerant air conditioning system, the normal high pressure value is usually between 2.0 to 3.0 MPa), it is considered that the shutdown refrigerant migration has been completed and the migration can be stopped.

[0080] Low pressure of air conditioning system reaches preset low pressure condition: When the low pressure value of the air conditioning system reaches the preset low pressure condition, such as the low pressure value reaching 0.3 MPa, it indicates that the shutdown refrigerant migration has reached the expected effect and the migration can be stopped to prevent over-migration from causing vacuuming on the low pressure side or other problems during startup.

[0081] Step 204, an end signal of the shutdown refrigerant migration operation is sent to sequentially close the throttling component and the compressor.

[0082] When the shutdown refrigerant migration is completed and the expected refrigerant distribution state is reached, the controller sends an end signal of the shutdown refrigerant migration operation to sequentially close the throttling component and the compressor, so that the air conditioning system enters a shutdown state. In this way, the components of the air conditioning system can be stopped in sequence, gradually releasing the pressure and energy in the air conditioning system, avoiding problems such as refrigerant backflow and pressure impact caused by sudden power failure or forced shutdown, ensuring that the shutdown process of the air conditioning system is smooth and safe, and the components are in a relatively stable state, preparing for the next startup.

[0083] Step 205: Obtain the values ​​of the operating parameters of the air conditioning system according to the preset time interval.

[0084] This step is similar to step 101 in Embodiment 1, and will not be repeated here.

[0085] Step 206: Determine whether the values ​​within the current time interval meet the high-voltage danger conditions.

[0086] If the high-pressure danger condition is met, proceed to steps 207 and 208; otherwise, return to step 203.

[0087] Before sending the refrigerant migration completion signal, the controller checks the operating parameters acquired within the current time interval to see if they meet the high-pressure danger conditions. During the refrigerant migration process, parameters such as pressure and temperature within the air conditioning system are dynamically changing, and there may be some unstable or risky factors. Acquiring and judging operating parameters at preset time intervals allows for real-time monitoring of the air conditioning system status, ensuring that the refrigerant migration process proceeds within a safe range. If high-pressure danger conditions are found before migration is complete, it indicates that the air conditioning system may be experiencing abnormal high pressure. In this case, the control logic needs to be adjusted promptly to prevent damage to the air conditioning system due to high pressure, ensuring equipment safety and extending its service life. By making advance judgments, subsequent operating procedures can be flexibly adjusted to ensure the accuracy of refrigerant migration and the smooth shutdown process of the air conditioning system.

[0088] Step 207: Send a high-pressure protection trigger signal to shut down the compressor and terminate the refrigerant migration operation.

[0089] When a high-pressure danger condition is met, it indicates that the high-pressure side pressure of the air conditioning system is too high. Continuing to run the compressor will cause the pressure to rise further, potentially damaging the compressor and related components, or even causing a safety accident. At this time, the controller sends a high-pressure protection trigger signal, shutting down the compressor to immediately stop the compression and circulation of the refrigerant, preventing the high-pressure side pressure from continuing to rise and protecting the air conditioning system.

[0090] Step 208: Send a first equalization signal to control the opening of the throttling component to increase to a first set value, so that the refrigerant in the high-pressure pipeline can migrate to the low-pressure pipeline.

[0091] After the compressor is turned off, the refrigerant in the high-pressure line is in a relatively closed state. Sending a pressure equalization signal increases the opening of the throttling device, allowing the refrigerant to move out of the high-pressure line. This gradually balances the pressure on the high-pressure and low-pressure sides of the air conditioning system, preventing excessive pressure differences in the system components due to pressure imbalance. It also creates favorable conditions for the subsequent proper distribution of refrigerant and the restart of the air conditioning system, reducing pressure shocks during startup.

[0092] Step 209, judge whether the pressure value in the high-pressure pipeline is within the preset safety range; If it is within the safety range, step 210 is executed; otherwise, step 209 is executed again.

[0093] After the refrigerant migration, it is necessary to confirm whether the high-pressure pipeline pressure has been reduced to the safety range. This step ensures that the air conditioning system pressure is in a stable state. If the pressure still does not meet the requirements, continue to perform the stop refrigerant migration operation until the pressure meets the requirements. This closed-loop control method precisely adjusts the refrigerant distribution, avoids air conditioning system failure or damage due to abnormal pressure, and ensures the safety and reliability of the air conditioning system.

[0094] Step 210, send a throttling component closing signal to close the throttling component, so that the air conditioning system enters a stop state.

[0095] When the pressure value in the high-pressure pipeline returns to the safety range, the controller sends a first stop signal to close the throttling component, so that the air conditioning system enters a stop state. This step ensures that the distribution of refrigerant in the air conditioning system reaches a relatively stable state, avoids the continuous disordered flow or leakage of refrigerant, completes the entire stop process, and ensures the safety and reliability of the air conditioning system during the stop period, laying a foundation for the next normal start and operation.

[0096] The method provided by Embodiment Two of the present application addresses the problem that the one-way valve in the air conditioning system will block the return flow of refrigerant at the moment of stopping, causing the accumulation of refrigerant on the high-pressure side. By precisely controlling the migration of refrigerant during the stopping process, the problem of high-pressure protection caused by unreasonable refrigerant distribution is effectively prevented. By monitoring the operating parameters in real time and adjusting the refrigerant migration strategy in a timely manner, the compressor is turned off in time when the air conditioning system has an abnormally high pressure risk, avoiding equipment damage and even safety accidents caused by high pressure, prolonging the service life of key components of the air conditioning system, and improving the reliability and stability of the air conditioning system. The sequential closing of the throttling component and the compressor allows the air conditioning system to transition smoothly during stopping, avoiding problems such as pressure impact and refrigerant backflow caused by sudden stopping, reducing energy loss after the air conditioning system stops, and allowing the components to be in a relatively stable state after performing the stop refrigerant migration operation, which is beneficial to protecting the integrity of the internal structure of the air conditioning system. By controlling the refrigerant reserved in the high-pressure pipeline, the amount of refrigerant in the low-pressure pipeline and the evaporator is reduced. This allows the compressor to have a relatively small load when the air conditioning system is started again, enabling it to quickly enter a normal operating state and achieve rapid cooling and heating, meeting the user's demand for fast response of the air conditioning system and improving the user's experience. It is suitable for different environmental conditions and operating conditions, including complex environments such as high temperature and low temperature, as well as various air conditioning system types such as single cold and heat pump, enhancing the environmental adaptability and versatility of the air conditioning system, and having a wide application prospect.

[0097] Embodiment Three Figure 5 A flowchart of a refrigerant migration control method according to Embodiment Three of the present application is provided. As shown in FIG. 3, the method comprises the following steps. Figure 5 Step 301: During standby of the compressor, obtain the value of the operating parameter of the air conditioning system at a preset time interval.

[0098] During standby of the compressor, the air conditioning system does not perform normal operation modes such as refrigeration or heating, but the distribution of refrigerant in the air conditioning system at this time still has an important influence on the next start. Obtaining the value of the operating parameter at a preset time interval helps to monitor the dynamic changes inside the air conditioning system in real time, and provides data support for subsequent judgment of whether to perform the shutdown refrigerant migration operation.

[0099] Step 302: Determine whether the value in the current time interval meets the high-pressure danger condition. If the high-pressure danger condition is met, perform step 303; otherwise, perform step 301.

[0100] During the period from completion of the shutdown refrigerant migration operation to arrival of the next start signal, the pressure and other parameters in the air conditioning system may fluctuate due to changes in external environmental temperature or internal slight leakage, and there is a potential risk. By continuously monitoring the operating parameter and timely judgment, abnormal high-pressure risk can be found in advance, the refrigerant distribution can be adjusted in time, the air conditioning system can be prevented from being damaged due to high pressure, the equipment safety and service life can be ensured, and the subsequent operation steps can be optimized to ensure accurate refrigerant migration and maintain the stability of the standby state of the air conditioning system.

[0101] Step 303: Send a second equalization signal to control the opening degree of the throttling component to increase to a second set value, so that the refrigerant in the high-pressure pipeline migrates from the high-pressure pipeline to the low-pressure pipeline.

[0102] When the high-pressure danger condition is met, it indicates that the amount of refrigerant in the high-pressure pipeline may be too much, resulting in excessively high pressure. By increasing the opening degree of the throttling component, the resistance of the high-pressure pipeline is reduced, and the refrigerant is prompted to migrate to the low-pressure pipeline. The equalization operation can balance the pressure of the air conditioning system, prevent components from being damaged or leaking due to excessively large pressure difference, optimize the refrigerant distribution, create favorable conditions for the next start, and reduce the pressure impact and air conditioning system load during start.

[0103] Step 304: Determine whether the pressure value in the high-pressure pipeline is within a preset safety range. If it is within the safety range, perform step 305; otherwise, perform step 304.

[0104] ​After the refrigerant migration, it is necessary to confirm whether the high-pressure pipeline pressure has been reduced to a safe range. This step ensures that the air conditioning system pressure is in a stable state. If the pressure still does not meet the requirements, continue to perform the stop refrigerant migration operation until the pressure meets the requirements. This closed-loop control method precisely adjusts the refrigerant distribution, avoids air conditioning system failure or damage due to abnormal pressure, and ensures the safety and reliability of the air conditioning system.

[0105] Step 305, send a throttle component closing signal to close the throttle component, so that the air conditioning system enters a stop state.

[0106] After the pressure value in the high-pressure pipeline returns to the safe range, the throttle component is closed, and the air conditioning system reenters a stable, stop state, ensuring that the refrigerant distribution reaches stability, preventing the refrigerant from continuing to flow or leak in disorder, maintaining the internal pressure balance of the air conditioning system, and avoiding energy loss and component wear. The air conditioning system can respond to the start command at any time in the stable standby state, achieving fast and smooth start, and improving user experience.

[0107] The method provided by Embodiment Three of the present application addresses the problem that the one-way valve in the air conditioning system will block the refrigerant return at the moment of shutdown, causing the refrigerant to accumulate on the high-pressure side. By monitoring the operating parameters at preset time intervals during the standby period of the air conditioning system, and dynamically adjusting the refrigerant distribution according to high-pressure dangerous conditions, the method effectively prevents high-pressure protection problems caused by refrigerant accumulation in the high-pressure pipeline. It ensures that the air conditioning system can maintain a stable standby state under various environmental conditions, avoiding abnormal pressure fluctuations caused by unreasonable refrigerant distribution. Through timely pressure equalization operation, the service life of the air conditioning system is extended, and maintenance costs are reduced. Optimized refrigerant distribution enables the air conditioning system to quickly respond when restarting, achieving fast cooling and heating effects, and improving user experience. In addition, the method enhances the adaptability and reliability of the air conditioning system under different working conditions, and has wide application value.

[0108] Embodiment Four Figure 6 The flowchart of the refrigerant migration control method provided by Embodiment Four of the present application is shown in FIG. 4. As shown in FIG. 4, the method comprises the following steps: Figure 6 Step 401, after determining that the compressor needs to be started until before starting the compressor, acquire the value of the operating parameter of the air conditioning system at preset time intervals.

[0109] During the short waiting period before starting the air conditioning system, the components of the air conditioning system are in a standby state, and at this time the refrigerant distribution will directly affect the running stability at the time of starting. By acquiring the operating parameter at preset time intervals, the air conditioning system state is monitored in real time, providing accurate data support for subsequent judgment of whether to adjust the refrigerant distribution.

[0110] ​Step 402, judge whether the value in the current time interval meets the high-pressure dangerous condition; If the high-pressure dangerous condition is met, step 403 is executed; otherwise, step 401 is executed.

[0111] Before starting, the air conditioning system pressure and refrigerant distribution may be abnormal due to temperature changes after shutdown or incomplete migration of refrigerant at the last shutdown. By judging whether the operating parameters meet the high-pressure dangerous condition, potential high-pressure risks can be discovered in advance. Timely adjustment of refrigerant distribution can avoid failures caused by high pressure during startup and ensure smooth startup of the air conditioning system.

[0112] Step 403, send a third equalization signal to control the throttle component opening to increase to a third set value, so that the refrigerant in the high-pressure pipeline migrates from the high-pressure pipeline to the low-pressure pipeline.

[0113] When the high-pressure dangerous condition is met, it indicates that the amount of refrigerant in the high-pressure pipeline may be too much and the pressure is too high. By increasing the opening of the throttle component, the resistance of the high-pressure pipeline is reduced, prompting the refrigerant to migrate to the low-pressure pipeline. This step can balance the pressure of the air conditioning system, prevent component damage or leakage due to excessive pressure difference, optimize the refrigerant distribution, create favorable conditions for the upcoming startup process, and reduce the pressure impact and air conditioning system load during startup.

[0114] Step 404, judge whether the pressure value in the high-pressure pipeline and the pressure value at the compressor discharge port are within their respective safe ranges; If both are within the safe range, step 405 is executed; otherwise, step 404 is continued.

[0115] After the refrigerant migration, it is necessary to confirm whether the high-pressure pipeline pressure has been reduced to the safe range. This step ensures that the air conditioning system pressure is in a stable state. If the pressure still does not meet the requirements, the shutdown refrigerant migration operation is continued until the pressure meets the requirements. This closed-loop control method precisely adjusts the refrigerant distribution, avoids air conditioning system failures or damage due to abnormal pressure, and ensures the safety and reliability of the air conditioning system. In addition, the pressure value at the compressor discharge port can directly reflect the operating state of the compressor. If the discharge port pressure is too high, it may cause the compressor to overload or be damaged. By monitoring and controlling the discharge port pressure, the compressor can be effectively protected and its service life can be extended.

[0116] By increasing the monitoring of the compressor discharge port pressure value, the air conditioning system can more comprehensively evaluate the refrigerant distribution and pressure conditions before starting, ensuring that the air conditioning system starts within a safe range. This dual monitoring mechanism not only improves the reliability and safety of the air conditioning system, but also optimizes the startup performance and extends the service life of the equipment.

[0117] Step 405: Adjust the opening degree of the throttling component to the preset opening degree during normal startup, start the compressor, and make the air conditioning system enter the startup execution ready state.

[0118] Once the pressure in the high-pressure pipeline returns to a safe range, the opening of the throttling component is adjusted to the preset opening for normal startup, and the compressor is started. This ensures stable refrigerant distribution, prevents continued disorderly refrigerant flow or leakage, maintains internal pressure balance in the air conditioning system, and avoids energy loss and component wear. The air conditioning system can respond to startup commands at any time while in a stable waiting state, achieving rapid and smooth startup and improving user experience.

[0119] The method provided in Embodiment 4 of this application addresses the problem of refrigerant accumulation on the high-pressure side caused by the one-way valve blocking refrigerant backflow during shutdown in air conditioning systems. By monitoring operating parameters at preset time intervals during a critical period before system startup and dynamically adjusting refrigerant distribution based on high-pressure danger conditions, it effectively prevents high-pressure protection issues caused by refrigerant accumulation in high-pressure pipelines. This ensures the air conditioning system starts in optimal condition under various environmental conditions, avoiding abnormal pressure fluctuations caused by improper refrigerant distribution. Timely pressure equalization extends the service life of the air conditioning system and reduces maintenance costs. Optimized refrigerant distribution enables the air conditioning system to respond quickly during startup, achieving rapid cooling and heating effects and improving the user experience. Furthermore, this method enhances the adaptability and reliability of the air conditioning system under different operating conditions, and has broad application value.

[0120] For example, the first to third setting values ​​in the above embodiments are key parameters for setting the opening degree of the throttling component, used to achieve refrigerant control targets at different stages. The following is a detailed explanation of their magnitude relationships and corresponding functions: The fourth setting is relatively small compared to the other settings. During shutdown, the throttling device opening is reduced to the fourth setting to increase the resistance on the high-pressure side, causing the refrigerant to tend to remain in the high-pressure line. This reduces the amount of refrigerant in the low-pressure line and evaporator, preventing refrigerant buildup in components such as the evaporator and avoiding excessively low evaporator pressure due to excessive refrigerant, which could affect the balance of the air conditioning system and its performance during subsequent startups.

[0121] The first setpoint is slightly larger than the fourth setpoint. After the compressor is turned off, a first pressure equalization signal is sent to increase the opening of the throttling device to the first setpoint, so that the refrigerant in the high-pressure line can migrate to the low-pressure line. This helps to balance the pressure of the air conditioning system, prevents the air conditioning system components from experiencing excessive pressure differences due to pressure imbalance, and creates favorable conditions for the subsequent reasonable distribution of refrigerant and the restart of the air conditioning system.

[0122] The second set value is greater than the fourth set value, and is generally close to or greater than the first set value. During the time period from the completion of the stop refrigerant migration operation to the next start signal, when it is judged that the high-pressure danger condition is met, the second equalization signal is sent to increase the opening degree of the throttling component to the second set value, prompting the refrigerant in the high-pressure pipeline to migrate to the low-pressure pipeline. This can optimize the refrigerant distribution, avoid high-pressure protection problems caused by the accumulation of refrigerant in the high-pressure pipeline, and at the same time ensure the pressure balance of the air conditioning system during standby.

[0123] The third set value is generally the maximum value, which can be the same as or greater than the second set value. During the time period when the start signal has been received but the compressor has not started, when it is judged that the high-pressure danger condition is met, the third equalization signal is sent to increase the opening degree of the throttling component to the third set value, so that the refrigerant in the high-pressure pipeline migrates to the low-pressure pipeline. This can ensure that the air conditioning system has reasonable refrigerant distribution during startup, reduce pressure impact and air conditioning system load during startup, and achieve fast and smooth startup.

[0124] The size relationship of these set values is intended to achieve the refrigerant control target in different stages. During shutdown, a smaller opening degree (fourth set value) helps to retain refrigerant in the high-pressure pipeline; while during equalization or migration, a larger opening degree (first to third set values) helps to migrate and balance the pressure of the refrigerant. The specific values can be accurately calibrated according to the actual design and operation of the air conditioning system to ensure stable operation and high efficiency of the air conditioning system.

[0125] For example, the values of the operating parameters are set according to a preset time interval, which can be periodically obtained, or obtained according to a preset time sampling point.

[0126] The preset time interval or sampling point should be reasonably planned according to different operating stages and air conditioning system requirements to ensure timely and accurate reflection of the real-time state of the air conditioning system. For example, during the time period from when the air conditioning system receives a start signal to when the compressor starts, the parameter changes quickly, so a shorter cycle time can be set, such as obtaining once every second; while in the stable operation stage, the air conditioning system parameters are relatively stable, and the cycle time can be appropriately extended, such as obtaining once every 3 minutes. For the preset time sampling point, it can be at a specific time point, such as the 1st minute, 5th minute, 10th minute, etc. after completing the stop refrigerant migration operation, or a period of time after a specific event, such as the 1st minute, 3rd minute, etc. after the ambient temperature reaches the set temperature.

[0127] For example, when the value in the current time interval satisfies any one of conditions 1 to 4, it is determined that the high-pressure danger condition is met.

[0128] Condition 1: The ambient temperature value meets the preset temperature abnormality condition; wherein the temperature abnormal condition is greater than a high temperature threshold; A high temperature environment can exacerbate the expansion effect of the refrigerant. When the ambient temperature exceeds the high temperature threshold, the startup can cause a sharp rise in pressure. For example, in a high temperature environment in summer, the air temperature around the outdoor unit can be as high as 45°C or more. If the amount of refrigerant in the high-pressure pipeline is relatively large at this time, the expansion of the refrigerant can cause the pressure on the high-pressure side to rise rapidly, increasing the risk of triggering high-pressure protection.

[0129] By monitoring the ambient temperature, the high-pressure risk caused by temperature abnormalities can be predicted in advance, and measures can be taken to adjust the refrigerant distribution in a timely manner to ensure that the air conditioning system can still operate safely under extreme temperature conditions, thereby enhancing the adaptability and reliability of the air conditioning system to the environment Condition 2: The outlet side pressure value of the one-way valve 2 is greater than or equal to a preset pressure threshold The outlet side pressure value of the one-way valve 2 directly reflects the pressure condition in the high-pressure pipeline. The one-way valve 2 is installed between the compressor discharge port and the external heat exchanger 4, and its outlet side pressure value is a key indicator of the high-pressure side pressure of the air conditioning system. When this pressure value is greater than or equal to the preset pressure threshold, it indicates that the pressure in the high-pressure pipeline is already too high, and the air conditioning system is in a high-pressure risk state. For example, for an R410A refrigerant air conditioning system, the normal high-pressure value is usually between 2.0-3.0 MPa, which is related to the ambient temperature. If the pressure value is detected to be 3.3 MPa, it indicates that the air conditioning system may have excessive accumulation of refrigerant, which may trigger a high-pressure hazard condition, and the air conditioning system needs to take refrigerant migration control measures to reduce the pressure.

[0130] By monitoring the outlet side pressure of the one-way valve 2 in real time, the pressure information of the high-pressure pipeline can be obtained directly and quickly. Once the pressure exceeds the threshold, pressure equalization measures can be taken immediately to effectively avoid the triggering of high-pressure protection due to excessive pressure, ensuring the stable operation of the air conditioning system and reducing the number of shutdowns due to high-pressure faults.

[0131] Condition 3: The subcooling degree is greater than or equal to a preset subcooling degree threshold The subcooling degree is the difference between the saturation temperature corresponding to the condensing pressure and the outlet temperature value of the condenser in the air conditioning system. It reflects the condensing effect of the refrigerant in the condenser. When the subcooling degree is large, it indicates that the refrigerant is being excessively cooled in the condenser, which may mean that the refrigerant is accumulating too much in the high-pressure pipeline. For example, under normal operating conditions, the subcooling degree is about 5-8°C. If the subcooling degree reaches 15°C (for a single cold air conditioning system) or 12°C (for a heat pump air conditioning system), it can be judged that the refrigerant is accumulating too much in the high-pressure pipeline, which may cause high-pressure protection problems.

[0132] A pressure sensor is installed on the condenser (usually at the inlet) or a temperature sensor is installed in the middle of the condenser to obtain the saturated temperature corresponding to the condensing pressure; specifically, the saturated temperature can be obtained by converting the pressure value collected by the high-pressure pressure sensor, or by collecting and correcting the temperature sensor in the middle of the condenser that can reflect the condenser pressure. A temperature sensor is installed at the outlet of the condenser to obtain the condenser outlet temperature value. Then calculate the difference between the two, i.e. the supercooling degree.

[0133] By monitoring the supercooling degree, the state of the refrigerant in the condenser and the amount of refrigerant in the high-pressure pipeline can be indirectly judged. When the supercooling degree exceeds the threshold value, the refrigerant distribution is adjusted in time to prevent excessive accumulation of liquid refrigerant on the high-pressure side, improve the operation safety and reliability of the air conditioning system, and optimize the refrigeration / heating performance of the air conditioning system.

[0134] Condition 4: The liquid accumulation coefficient value is greater than or equal to the preset liquid accumulation coefficient threshold.

[0135] The liquid accumulation coefficient is used to evaluate the degree of refrigerant accumulation in the high-pressure pipeline. When the liquid accumulation coefficient value is greater than or equal to the preset liquid accumulation coefficient threshold, it indicates that the refrigerant may be excessively accumulated, and the air conditioning system has a high-pressure risk.

[0136] For example, the value of the liquid accumulation coefficient can be obtained based on a deep learning model trained on historical operating data (including supercooling degree, condensing temperature difference, high-pressure pressure, etc.).

[0137] These four conditions monitor the high-pressure risk of the air conditioning system from different angles and can achieve early warning. By monitoring environmental temperature, one-way valve 2 outlet side pressure, supercooling degree, and liquid accumulation coefficient, the air conditioning system can discover potential risks in time before the high-pressure protection is triggered, and take appropriate refrigerant migration control measures. This early warning and precise control method not only avoids equipment downtime and damage caused by high-pressure protection, but also optimizes refrigerant distribution, improves the operating efficiency and performance of the air conditioning system, and ensures that the air conditioning system can operate stably and reliably under various working conditions.

[0138] In other alternative embodiments, other conditions or combinations of conditions can be set as high-pressure risk conditions according to the actual situation and needs of the air conditioning system.

[0139] Figure 7 The schematic diagram of the sensor deployment position in the refrigeration mode of the heat pump air conditioning system provided in the embodiments of the present application is shown in FIG. 1. Figure 7 As shown in FIG. 1, the sensors used in conditions 1 to 4 are described as follows: In condition 1, the temperature sensor Ta is deployed on the shell of the outdoor unit to measure the outdoor environmental temperature, which is used to monitor the external environmental temperature of the air conditioning system and determine whether it is in an abnormally high or low temperature state.

[0140] In condition 2, the pressure sensor Pc is installed on the outlet side pipeline of the one-way valve 2, adjacent to the external heat exchanger 4, for real-time monitoring of the pressure value of the high-pressure pipeline, to determine whether the air conditioning system pressure is too high, to prevent high-pressure protection problems.

[0141] In condition 3, the temperature sensor Tc is located in the middle pipeline of the condenser, and the pressure sensor Pc is installed on the outlet side pipeline of the one-way valve 2, adjacent to the external heat exchanger 4; wherein the temperature sensor Tc and the pressure sensor Pc can be deployed alternatively, for obtaining the saturation temperature corresponding to the condensing pressure. The temperature sensor Tout is deployed on the outlet pipeline of the condenser (external heat exchanger 4), for measuring the temperature of the condenser outlet. The supercooling degree is calculated to evaluate the condensing effect of the refrigerant in the condenser.

[0142] In condition 4, the temperature sensor Tc is located in the middle pipeline of the condenser, and the pressure sensor Pc is installed on the outlet side pipeline of the one-way valve 2, adjacent to the external heat exchanger 4; wherein the temperature sensor Tc and the pressure sensor Pc can be deployed alternatively. The temperature sensor Tout is deployed on the outlet pipeline of the condenser (external heat exchanger 4), for measuring the temperature of the condenser outlet. The temperature sensor Ta is deployed on the shell of the outdoor unit, for measuring the outdoor environment temperature.

[0143] Through the deployment and data collection of these sensors, the air conditioning system can monitor the refrigerant state and the operation condition of the air conditioning system in real time, to realize accurate judgment of the high-pressure protection condition and efficient management of the refrigerant.

[0144] Optionally, the liquid accumulation coefficient value is the ratio between the supercooling degree and a first difference value, wherein the first difference value is the difference between the saturation temperature corresponding to the condensing pressure and the environment temperature.

[0145] wherein the calculation formula of the liquid accumulation coefficient value Jyxs is: Jyxs = SC / (Tc - Ta), wherein SC is the supercooling degree, Tc is the saturation temperature corresponding to the condensing pressure, and Ta is the environment temperature.

[0146] The liquid accumulation coefficient value can more accurately reflect the accumulation risk of the refrigerant in the high-pressure pipeline. Compared with using only the supercooling degree or the temperature as the judgment condition, the liquid accumulation coefficient comprehensively considers the supercooling degree and the heat dissipation capacity of the condenser (reflected by the first difference value), which can more comprehensively and accurately evaluate the accumulation degree of the refrigerant. For example, in the case of the same supercooling degree, if the heat dissipation capacity of the condenser is strong (i.e., the first difference value is large), the liquid accumulation coefficient is relatively small, indicating a low risk of refrigerant accumulation; on the contrary, if the heat dissipation capacity of the condenser is poor (i.e., the first difference value is small), even if the supercooling degree is the same, the liquid accumulation coefficient will be large, indicating a high risk of refrigerant accumulation.

[0147] By combining the supercooling degree and the temperature, the liquid accumulation coefficient can be determined, which can more accurately reflect the risk of refrigerant accumulation in the high-pressure pipeline. The supercooling degree directly reflects the condensation degree of the refrigerant in the condenser, while the temperature reflects the thermal state of the environment and each part of the air conditioning system. This comprehensive evaluation method can more comprehensively capture the potential risk of refrigerant accumulation and avoid the limitations of single parameter judgment. For example, relying solely on the supercooling degree may not be able to distinguish between normal supercooling degree caused by strong heat dissipation of the condenser and abnormal supercooling degree caused by refrigerant accumulation; after combining the temperature to calculate the liquid accumulation coefficient, the refrigerant accumulation situation can be more accurately identified, so that measures can be taken in advance to prevent the occurrence of high-pressure protection problems.

[0148] The embodiments of the present application provide a storage medium, wherein the storage medium stores a computer program, and the computer program is configured to execute the method described above when running.

[0149] In addition, the embodiments of the present application also provide an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to execute the method described above.

[0150] In addition, the embodiments of the present application also provide an air conditioning system, comprising the electronic device described above, a compressor, a one-way valve, an external heat exchanger, an internal heat exchanger, and a throttling component arranged between the external heat exchanger and the internal heat exchanger, wherein the inlet of the one-way valve is connected to the exhaust port of the compressor, and the electronic device described above is used to execute refrigerant migration control.

[0151] The electronic device described above can be integrated in the controller of the air conditioning system.

[0152] Optionally, the air conditioning system is also provided with a four-way valve located between the one-way valve and the external heat exchanger.

[0153] The connection relationship of each part in the air conditioning system can refer to the structure shown in Figure 1 and Figure 2 The working mode of the system can refer to the function description of the system shown in Figure 1 and Figure 2 Here, no longer described in detail.

[0154] Optionally, the number of the inner heat exchangers in the air conditioning system is at least two, so that the air conditioning system can be widely applied to occasions requiring multi-area independent temperature control, such as families, offices, commercial buildings, etc. For example, in a large office, rooms of different orientations have different temperature requirements, and the system can meet the individual temperature adjustment requirements. In a family, multiple inner heat exchangers can simultaneously provide refrigeration or heating for different rooms, improving the living comfort. In a commercial place such as a shopping mall or supermarket, the system can flexibly cope with the load changes brought by high flow of people, and maintain the indoor temperature stable. In summary, the air conditioning system, with the design of multiple inner heat exchangers and the efficient refrigerant migration control method, provides flexible and efficient temperature adjustment solutions for various application scenarios.

[0155] It is understood by those skilled in the art that all or some of the steps in the method disclosed above, the functional modules / units in the air conditioning system and the device can be implemented as software, firmware, hardware and appropriate combinations thereof. In the hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be performed by several physical components in cooperation. Some or all of the components can be implemented as software executed by a processor such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those skilled in the art, the term "computer storage media" includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is known to those skilled in the art that communication media generally includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carrier waves or other transport mechanisms, and can include any information delivery medium.

Claims

1. A refrigerant migration control method applied to an air conditioning system, the air conditioning system comprising a compressor, a check valve, an external heat exchanger, an internal heat exchanger, and a throttling component provided between the external heat exchanger and the internal heat exchanger, wherein an inlet of the check valve is connected to a discharge port of the compressor, wherein, The pipe through which the refrigerant flows from the outlet of the one-way valve to the inlet of the throttling component is a high-pressure pipe, and the pipe through which the refrigerant flows from the outlet of the throttling component to the suction port of the compressor is a low-pressure pipe, and the method comprises: acquiring values of preset operating parameters in the air conditioning system multiple times after determining that the compressor needs to be stopped until the next time the compressor is started; controlling the amount of refrigerant in the high-pressure pipe according to the values of the operating parameters, so that the pressure value in the high-pressure pipe is within a preset safety range.

2. The method of claim 1, wherein, The control of the amount of refrigerant in the high-pressure pipe according to the values of the operating parameters comprises: in response to the values of the operating parameters acquired this time meeting a preset high-pressure danger condition, controlling part of the refrigerant in the high-pressure pipe to migrate to the low-pressure pipe.

3. The method of claim 1, wherein: the multiple acquisitions of the values of the preset operating parameters in the air conditioning system comprise: during a process of performing a stoppage refrigerant migration operation after determining that the compressor needs to be stopped, acquiring the operating parameters at preset time intervals; the control of the amount of refrigerant in the high-pressure pipe according to the values of the operating parameters comprises: during the process of the stoppage refrigerant migration operation, in response to the values of the operating parameters at the current time interval meeting the preset high-pressure danger condition, stopping the compressor and terminating the stoppage refrigerant migration operation.

4. The method of claim 3, wherein, The control of the amount of refrigerant in the high-pressure pipe according to the values of the operating parameters further comprises: during the process of the stoppage refrigerant migration operation, in response to the values of the operating parameters at the current time interval meeting the preset high-pressure danger condition, sending a first pressure equalization signal to control the opening degree of the throttling component to increase to a first set value, so that the refrigerant in the high-pressure pipe migrates to the low-pressure pipe; and in response to the pressure value in the high-pressure pipe being within the safety range, closing the throttling component.

5. The method of claim 1, wherein: the multiple acquisitions of the values of the preset operating parameters in the air conditioning system comprise: acquiring the values of the operating parameters at preset time intervals during a process in which the compressor is on standby; the control of the amount of refrigerant in the high-pressure pipe according to the values of the operating parameters comprises: during the process in which the compressor is on standby, in response to the values of the operating parameters at the current time interval meeting the preset high-pressure danger condition, sending a second pressure equalization signal to control the opening degree of the throttling component to increase to a second set value, so that the refrigerant in the high-pressure pipe migrates to the low-pressure pipe; and in response to the pressure value in the high-pressure pipe being within the safety range, closing the throttling component.

6. The method of claim 1, wherein: the multiple acquisitions of the values of the preset operating parameters in the air conditioning system comprise: acquiring the values of the operating parameters at preset time intervals after determining that the compressor needs to be started until starting the compressor; the control of the amount of refrigerant in the high-pressure pipe according to the values of the operating parameters comprises: After determining that the compressor needs to be started, in response to the value of the operating parameter in the current time interval satisfying a preset high-pressure dangerous condition, a third equalization signal is sent to control the opening degree of the throttling component to increase to a third set value, so that the refrigerant in the high-pressure pipeline migrates to the low-pressure pipeline; and In response to the pressure value in the high-pressure pipeline being in the safety range, the opening degree of the throttling component is adjusted to a preset opening degree during normal starting, and the compressor is started.

7. The method according to any one of claims 2 to 6, characterized in that, The preset operating parameters include at least one of an ambient temperature value, an outlet side pressure value of the check valve, a subcooling degree, and a liquid accumulation coefficient value; When the value obtained this time satisfies any one of the following conditions, it is determined that the high-pressure dangerous condition is met: The ambient temperature value satisfies a preset temperature abnormality condition; The outlet side pressure value of the check valve is greater than or equal to a preset pressure threshold value; The subcooling degree is greater than or equal to a preset subcooling degree threshold value, wherein the subcooling degree is obtained according to the difference between the saturation temperature corresponding to the condensing pressure and the condenser outlet temperature value in the air conditioning system; The liquid accumulation coefficient value is greater than or equal to a preset liquid accumulation coefficient threshold value.

8. The method of claim 7, wherein, The liquid accumulation coefficient value is the ratio between the subcooling degree and a first difference value, wherein the first difference value is the difference between the saturation temperature corresponding to the condensing pressure and the ambient temperature.

9. A storage medium, characterized by The storage medium stores a computer program, wherein the computer program is configured to execute the method described in any one of claims 1 to 8 when running. 10.An electronic device comprising a memory and a processor, the electronic device characterized by, The storage medium stores a computer program, wherein the computer program is configured to execute the method described in any one of claims 1 to 8 when running.

11. An air conditioning system, characterised in that, The electronic device, the compressor, the check valve, the external heat exchanger, the internal heat exchanger, and the throttling component arranged between the external heat exchanger and the internal heat exchanger of claim 10, wherein the inlet of the check valve is connected to the exhaust port of the compressor, and the electronic device is used to execute refrigerant migration control.

12. The air conditioning system of claim 11, wherein, The air conditioning system further comprises: A four-way valve having a C port, a D port, an E port, and an S port, wherein the D port is connected to the outlet of the check valve, the C port is connected to the external heat exchanger, the E port is connected to the internal heat exchanger, and the S port is connected to the return air port of the compressor.

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