Air conditioning system

Abstract

The application discloses an air conditioning system, comprising: an outdoor unit, having a compressor, an outdoor heat exchanger and an outdoor throttling device; an indoor unit, comprising an indoor heat exchanger connected with the outdoor heat exchanger through refrigerant pipes; a sensor assembly, detecting a first system operating parameter; a controller configured to: determine whether the system operation is abnormal according to the first system operating parameter, obtain the opening degree of the outdoor throttling device when the system is determined to be abnormal and in operation, adjust the opening degree of the outdoor throttling device based on the first system operating parameter when the opening degree of the outdoor throttling device is determined to be at the lower limit threshold of the preset throttling interval, and adjust the lower limit threshold of the outdoor throttling device according to the opening degree adjustment of the outdoor throttling device when the system is determined to be in a normal operating state after the opening degree of the outdoor throttling device is adjusted for a preset time. In the application, the lower limit threshold of the opening degree of the outdoor throttling device is changed from a fixed value to a self-adjusting correction value, so that the flow regulation can be more accurate.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically to an improvement in the structure of an air conditioning system. Background Technology

[0002] The outdoor throttling device, also known as the electronic expansion valve, is a core component of the air conditioning system. Reliable and precise flow regulation determines the stable operation of the air conditioning system.

[0003] In control, a lower limit threshold for the opening of the electronic expansion valve is often set to prevent over-adjustment that could cause the electronic expansion valve to close instantly, resulting in a vacuum in the compressor.

[0004] like Figure 1 As shown, the opening point a (lower limit of the valve body) of the electronic expansion valve is not at 0. Therefore, to avoid shut-off, the lower threshold of the electronic expansion valve is generally set at point b, with a flow rate of c. However, due to manufacturing differences in electronic expansion valves, the opening point a is not a fixed value and has positive and negative tolerances. Therefore, although the lower threshold is set to a fixed value, the flow rate is not fixed.

[0005] For some electronic expansion valves with negative opening point deviation, the flow rate at opening point a1 and point b will increase, resulting in a flow rate of c1. Under certain operating conditions, the throttling effect is insufficient, leading to liquid return and causing abnormal operation of the air conditioning equipment.

[0006] For some electronic expansion valves with positive deviation in valve opening point, the flow rate at valve opening point a2 and point b will be small, with a flow rate of c2 (0). At this time, when the electronic expansion valve is controlled to the lower limit threshold, a vacuum phenomenon will occur, and the low pressure will be too low, which will also cause abnormal operation of the air conditioning equipment.

[0007] Due to manufacturing deviations in the electronic expansion valve itself, the outdoor throttling device may cause over-throttling or poor throttling when the opening is at the lower threshold, resulting in inaccurate flow regulation of the outdoor throttling device. This can lead to problems such as vacuuming or liquid return during system operation, affecting the overall system reliability. Summary of the Invention

[0008] In response to the problems pointed out in the background art, the air conditioning system of the present invention changes the lower limit threshold of the opening of the outdoor throttling device from a fixed value to a system self-adjustment and correction, which can more accurately regulate the flow rate.

[0009] In some embodiments of this application, an air conditioning system is provided, comprising: The outdoor unit includes a compressor, an outdoor heat exchanger, and an outdoor throttling device. The indoor unit includes an indoor heat exchanger and is connected to the outdoor unit via refrigerant piping; Sensor components are used to acquire the operating parameters of the first system; The controller is configured as follows: The system is determined to be abnormal based on the first system operating parameters. When the system is determined to be abnormal and is in operation, the opening degree of the outdoor throttling device is obtained. When the opening degree of the outdoor throttling device is determined to be at the lower limit threshold of the preset throttling range, the opening degree of the outdoor throttling device is adjusted based on the operating parameters of the first system. If the system enters normal operation after a preset time from when the outdoor throttling device opening is adjusted, the lower limit threshold of the outdoor throttling device will be adjusted according to the outdoor throttling device opening adjustment. The first system operating parameters include exhaust temperature, intake pressure, and exhaust superheat. If either the exhaust temperature or intake pressure meets the first preset condition, or if either the exhaust temperature or exhaust superheat meets the second preset condition, the system is determined to be abnormal; otherwise, the system is determined to be in normal operating condition.

[0010] The above embodiments have the following advantages and effects: When the system is in an abnormal operating state and the opening of the outdoor throttling device is at the lower threshold, it is very likely that the system flow regulation is inaccurate due to the manufacturing deviation of the outdoor throttling device. In this case, the opening of the outdoor throttling device can be adjusted accordingly based on the value fed back by the first system operating parameter.

[0011] If the system returns to normal operation after adjusting the opening of the outdoor throttling device and running for a period of time, it indicates that the adjustment method of the outdoor throttling device opening is correct, but the lower limit threshold setting of the outdoor throttling device opening is inaccurate. In this case, the lower limit threshold of the outdoor throttling device can be adjusted accordingly based on the adjustment of the opening size of the outdoor throttling device to ensure that the outdoor throttling device can accurately regulate the flow and that the system can operate stably and reliably.

[0012] In some embodiments of this application, the controller is configured to increase the opening of the outdoor throttling device when either the exhaust temperature or the intake pressure meets a first preset condition. When the system enters normal operation after a preset time period following the increase in the opening of the outdoor throttling device, the lower limit threshold of the outdoor throttling device is raised.

[0013] The above embodiments have the following advantages and effects: When the exhaust temperature and intake pressure meet the first preset conditions and the outdoor throttling device opening is at the lower threshold, it is highly likely that the system flow regulation is inaccurate when the opening is at the lower threshold due to manufacturing deviation of the outdoor throttling device. After the system returns to normal after increasing the opening of the outdoor throttling device and maintaining the operation for the preset time, it can be determined that the lower threshold of the outdoor throttling device is set too low, causing the normal adjustment process of the system to be over-adjusted and the opening of the outdoor throttling device to be too low. At this time, the lower threshold of the outdoor throttling device should be increased.

[0014] In some embodiments of this application, the first preset condition is: the exhaust temperature is above a first determination value or the intake pressure is below a second determination value.

[0015] The above embodiments have the following advantages and effects: By setting judgment conditions for both exhaust temperature and intake pressure to determine whether they are normal, the actual exhaust temperature and intake pressure detected during system operation can be compared with the above judgment conditions to quickly and accurately determine whether the system is operating abnormally.

[0016] In some embodiments of this application, the controller is configured as follows: When either the exhaust temperature or the exhaust superheat meets the second preset condition, the opening of the outdoor throttling device is reduced. The control unit is configured to control the lower limit threshold of the outdoor throttling device to decrease when the system enters normal operation after a preset time has elapsed since the system adjusts the opening of the outdoor throttling device to decrease.

[0017] The above embodiments have the following advantages and effects: When the exhaust temperature or exhaust superheat meets the second preset condition and the outdoor throttling device opening is at the lower threshold, it is highly likely that the system flow regulation is inaccurate when the opening is at the lower threshold due to manufacturing deviation of the outdoor throttling device. After the system returns to normal after increasing the opening of the outdoor throttling device and maintaining the operation for a preset time, it can be determined that the lower threshold of the outdoor throttling device is set too high. This causes the flow to be too large during the normal adjustment process, even though the opening of the outdoor throttling device has reached the lower limit, resulting in abnormal system operation. Therefore, lowering the lower threshold of the outdoor throttling device can ensure the normal and stable operation of the system.

[0018] In some embodiments of this application, the second preset condition is: the exhaust temperature is below a first determination value or the exhaust superheat is below a third determination value.

[0019] The above embodiments have the following advantages and effects: When the exhaust temperature is detected to be below the first judgment value or the exhaust superheat is detected to be below the third judgment value, it can be determined that the exhaust temperature is excessive and the exhaust superheat is too low. When the opening of the outdoor throttling device is at the lower limit threshold, the system abnormality is very likely caused by the poor throttling of the outdoor throttling device, which provides a basis for adjusting the opening of the outdoor throttling device.

[0020] In some embodiments of this application, an air conditioning system includes: The outdoor unit includes a compressor, an outdoor heat exchanger, and an outdoor throttling device. The indoor unit includes an indoor heat exchanger and is connected to the outdoor unit via refrigerant piping; Sensor components are used to detect the operating parameters of the first system; The controller is configured to: when it is determined that the system is in a shutdown state due to an operational abnormality, acquire the opening degree of the outdoor throttling device at the time of shutdown; When the opening of the outdoor throttling device is determined to be at the lower limit of the preset throttling range, the first system operating parameters and the second system operating parameters at the time of system shutdown are obtained, and the opening of the outdoor throttling device is adjusted based on the first system operating parameters at the time of shutdown. Based on the second system operating parameters at the time of shutdown and the adjusted outdoor throttling device opening control system, the system restarts for a preset time. After the preset system operating time is determined, the system enters normal operation and the lower limit threshold of the outdoor throttling device is adjusted according to the adjustment of the outdoor throttling device opening. The first system operating parameters include exhaust temperature, intake pressure and exhaust superheat, while the second system operating parameters are the operating parameters of the multi-split air conditioning system in the shutdown state. If either the exhaust temperature or the intake pressure meets the third preset condition, or if either the exhaust temperature or the exhaust superheat meets the fourth preset condition, the system is determined to shut down due to abnormal operation.

[0021] The above embodiments have the following advantages and effects: When the system is in an abnormal shutdown state and the opening degree of the outdoor throttling device is at the lower threshold, it is very likely that the opening degree is at the lower threshold due to manufacturing deviation of the outdoor throttling device. In order to find out the cause of the shutdown, the opening degree of the outdoor throttling device can be adjusted accordingly based on the value of the first system operating parameter feedback at the time of shutdown.

[0022] If the system returns to normal operation after the second system operating parameters before shutdown and the adjusted outdoor throttling device opening are re-run for a preset time, it indicates that the lower limit threshold setting of the outdoor throttling device opening is inaccurate. In this case, the lower limit threshold of the outdoor throttling device can be adjusted accordingly based on the adjustment of the outdoor throttling device opening to ensure that the outdoor throttling device can accurately regulate the flow and the system can operate stably and reliably.

[0023] In some embodiments of this application, the controller is configured to increase the opening of the outdoor throttling device when either the exhaust temperature or the intake pressure meets a third preset condition. When the system enters normal operation after determining the second system operating parameters based on the shutdown and the preset time of operation of the increased outdoor throttling device opening, it is determined that the lower limit threshold of the outdoor throttling device is too low, and the lower limit threshold of the outdoor throttling device is controlled to be increased.

[0024] The above embodiments have the following advantages and effects: When the outdoor throttling device opening is detected to be at the lower limit threshold and the exhaust temperature or intake pressure meets the third preset condition, the abnormal system shutdown is most likely caused by the manufacturing deviation of the outdoor throttling device, which causes the opening to be at the lower limit threshold, resulting in inaccurate system flow regulation. After re-running the system for a preset time with the second system operating parameters at the time of shutdown and the increased opening of the outdoor throttling device, if the system returns to normal operation, it can be determined that the lower limit threshold of the outdoor throttling device is set too low. Increasing the lower limit threshold can ensure stable system operation.

[0025] In some embodiments of this application, the controller is configured to: reduce the opening of the outdoor throttling device when one of the exhaust temperature and exhaust superheat meets a fourth preset condition; When the system enters normal operation after determining the second system operating parameters based on the shutdown and the preset time of operation of the reduced outdoor throttling device opening, it is determined that the lower limit threshold of the outdoor throttling device is too high, and the lower limit threshold of the outdoor throttling device is controlled to be reduced.

[0026] The above embodiments have the following advantages and effects: When the outdoor throttling device opening is detected to be at the lower threshold and either the exhaust temperature or the exhaust superheat meets the fourth preset condition, it is highly likely that the system will shut down due to inaccurate flow regulation caused by the outdoor throttling device manufacturing deviation, which is located at the lower threshold. After re-running the system for a preset time with the second system operating parameters at the time of shutdown and the opening of the outdoor throttling device after adjustment, if the system returns to normal operation, it can be determined that the lower threshold of the outdoor throttling device is set too high. Lowering the lower threshold will ensure stable system operation.

[0027] In some embodiments of this application, the third preset condition is: the exhaust temperature is above the fourth determination value or the intake pressure is below the fifth determination value.

[0028] The above embodiments have the following advantages and effects: When the exhaust temperature is detected to be above the fourth judgment value or the intake pressure is below the fifth judgment value, it can be determined that the exhaust temperature is too high or the exhaust superheat is too low. When the opening of the outdoor throttling device is at the lower limit threshold, the system abnormality is very likely caused by excessive throttling of the outdoor throttling device, which provides a basis for adjusting the opening of the outdoor throttling device.

[0029] In some embodiments of this application, the fourth preset condition is: the exhaust temperature is below the fourth determination value or the exhaust superheat is below the sixth determination value.

[0030] The above embodiments have the following advantages and effects: When the exhaust temperature is detected to be below the fourth judgment value or the exhaust superheat is detected to be below the sixth judgment value, it can be determined that the exhaust temperature is excessive and the exhaust superheat is too low. When the opening of the outdoor throttling device is at the lower limit threshold, the system abnormality is very likely caused by the poor throttling of the outdoor throttling device, which provides a basis for adjusting the opening of the outdoor throttling device.

[0031] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 The flow rate curve of an existing electronic expansion valve when the valve opening point is deviated and the valve opening degree is at the lower threshold. Figure 2 This is a schematic diagram of the cooling operation of an air conditioning system according to an embodiment; Figure 3 This is a schematic diagram of the heating operation of an air conditioning system according to an embodiment; Figure 4 This is a schematic diagram of the outdoor unit of an air conditioning system according to an embodiment; Figure 5 This is a flowchart illustrating the control and adjustment process of the outdoor throttling device and its lower limit threshold of the air conditioning system according to an embodiment when the first system operating parameters meet the first preset conditions. Figure 6 This is a flowchart illustrating the control and adjustment process of the outdoor throttling device and its lower limit threshold of the air conditioning system according to an embodiment when the first system operating parameters meet the second preset conditions. Figure 7 This is a flowchart illustrating the control and adjustment process of the outdoor throttling device and its lower limit threshold of the air conditioning system according to an embodiment when the first system operating parameters meet the third preset condition. Figure 8 This is a flowchart illustrating the control and adjustment process of the outdoor throttling device and its lower limit threshold of the air conditioning system according to an embodiment when the first system operating parameters meet the fourth preset condition. Figure 9 This is a structural block diagram of the air conditioning system first system operating parameter acquisition determination value according to an embodiment; Figure 10 This is a block diagram showing the structural configuration of the first system operating parameters of an air conditioning system according to an embodiment.

[0034] Reference numerals: 100, Outdoor unit; 110, Compressor; 120, Outdoor heat exchanger; 130, Outdoor throttling device; 140, Gas-liquid separator; 200, Indoor unit; 310, Suction pressure sensor; 320, Exhaust temperature sensor; 330, Exhaust pressure sensor; 400, First system operating parameters; 410, Exhaust temperature; 420, Suction pressure; 430, Exhaust superheat; 510, Outdoor unit temperature range; 520, Indoor unit temperature range; 530, Compressor frequency range. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0041] In some embodiments of this application, an air conditioning system is proposed.

[0042] Reference Figures 2-3 As shown, the air conditioning system in this application performs a refrigeration cycle by using a compressor 110, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation to cool or heat the indoor space.

[0043] Low-temperature, low-pressure refrigerant enters compressor 110, which compresses it into a high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0044] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor 110. The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0045] The outdoor unit 100 of the air conditioning system includes a compressor 110, an outdoor heat exchanger 120, a gas-liquid separator 140, and an outdoor throttling device 130.

[0046] The indoor unit 200 of the air conditioning system includes an indoor heat exchanger and is connected to the outdoor unit 100 via refrigerant piping. An expansion valve can be provided in either the indoor unit 200 or the outdoor unit 100.

[0047] The indoor and outdoor heat exchangers 120 are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioning system acts as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioning system acts as a cooler in cooling mode.

[0048] In some embodiments of this application, compressor 110 is connected to gas-liquid separator 140.

[0049] A suction pressure sensor 310 is installed on the suction pipe connecting the compressor 110 and the gas-liquid separator 140. The suction pressure sensor 310 can be used to detect the suction pressure 420 value of the compressor 110.

[0050] An exhaust pressure sensor 330 is installed on the exhaust pipe of the compressor 110. The exhaust pressure sensor 330 can be used to detect the exhaust pressure value of the compressor 110.

[0051] A corresponding exhaust temperature sensor 320 is connected to the compressor 110. The exhaust temperature sensor 320 is used to detect the exhaust temperature 410 of the compressor 110.

[0052] The exhaust superheat of 430 can be obtained by using the difference between the exhaust temperature of 410 and the corresponding saturation temperature of the exhaust pressure. Therefore, the exhaust superheat of 430 is: Exhaust superheat 430 = Exhaust temperature 410 - Exhaust pressure saturation temperature The compressor 110 is the main core component of the entire air conditioning system. The first system operating parameters 400 are the suction pressure 420, discharge pressure 410, discharge temperature 410 of the compressor 110, and the discharge superheat 430 obtained by the difference between the discharge temperature 410 and the discharge pressure saturation temperature of the compressor 110.

[0053] The sensor assembly consisting of the intake pressure sensor 420, the exhaust pressure sensor 330, and the exhaust temperature sensor 320 can be used to obtain the first system operating parameter 400.

[0054] The outdoor throttling device 130 is an outdoor electronic expansion valve. The electronic expansion valve itself has an upper limit value and a lower limit value (the value of the valve opening point). In order to ensure the reliable operation of the air conditioning system, the outdoor throttling device 130 is preset in the controller during the operation of the air conditioning system. The preset throttling range has an upper limit threshold and a lower limit threshold. During the flow regulation process, the opening degree of the outdoor throttling device 130 is ensured to be between the upper limit threshold and the lower limit threshold.

[0055] However, due to manufacturing deviations in the 130 outdoor throttling devices, the valve opening point may not be exactly at the set valve opening point position, but may have positive or negative deviations.

[0056] For some electronic expansion valves with negative opening point deviation, when the opening degree of the electronic expansion valve is at the lower threshold, the flow rate through the electronic expansion valve will be too large. Under some operating conditions, the throttling effect is insufficient, which may cause the compressor 110 to return liquid.

[0057] For some electronic expansion valves with a positive deviation in the valve opening point, when the electronic expansion valve is at the lower threshold, the flow rate through the electronic expansion valve will be lower, which will lead to excessive throttling under some operating conditions and cause the compressor 110 to draw a vacuum.

[0058] To avoid the aforementioned problems, the air conditioning system in this embodiment is equipped with corresponding control logic. The system can automatically adjust and correct the lower limit threshold of the preset throttling range corresponding to the outdoor throttling device 130 based on the operating conditions, thereby avoiding the problem that the flow rate cannot be accurately adjusted when the expansion valve is at the lower limit threshold due to individual differences in the electronic expansion valve.

[0059] In some embodiments of this application, the controller is configured to: acquire a first system operating parameter 400 when the system is in heating mode, and determine whether the system is operating abnormally based on the first system operating parameter 400.

[0060] The controller acquires the values ​​of the intake pressure sensor 310, exhaust pressure sensor 330 and exhaust temperature sensor 320 by communicating with the sensor components, thereby obtaining the intake pressure 420, exhaust pressure temperature and exhaust superheat 430.

[0061] The system is determined to be in an abnormal state by analyzing the collected values ​​of the first system operating parameter 400.

[0062] In some embodiments of this application, the exhaust temperature 410 is detected to be above a first determination value or the intake pressure 420 is detected to be below a second determination value; Alternatively, if the exhaust temperature 410 is below the first judgment value or the exhaust superheat 430 is below the third judgment value, it indicates that the system operating parameter values ​​have deviated from the normal judgment values, and the system is judged to be in an abnormal state.

[0063] When the system is determined to be abnormal and in operation, the opening degree of the outdoor throttling device 130 is obtained.

[0064] Although the first system operating parameter 400 deviates from the normal judgment value, the deviation range is not large, and the system can still be in operation when the alarm state is not reached.

[0065] When the system detects an abnormality, the control unit needs to obtain the opening value of the outdoor throttling device 130 to see if the opening value of the outdoor throttling device 130 is at the lower limit threshold. If the opening value of the outdoor throttling device 130 is found to be at the lower limit threshold, the rationality of the lower limit threshold setting is checked, and then it is determined whether the abnormal system operation is caused by the manufacturing deviation of the outdoor throttling device 130.

[0066] When the opening degree of the outdoor throttling device 130 is determined to be at the lower limit threshold of the preset throttling range, the opening degree of the outdoor throttling device 130 is adjusted based on the first system operating parameter 400.

[0067] Adjusting the opening degree of the outdoor throttling device 130 includes increasing or decreasing the first preset value based on the lower limit threshold, thereby increasing or decreasing the opening degree of the outdoor throttling device 130.

[0068] After adjusting the opening of the outdoor throttling device 130 for a preset time, it is determined whether the system has entered normal operation. When it is determined that the system has entered normal operation, the lower limit threshold of the outdoor throttling device 130 is adjusted according to the adjustment of the opening of the outdoor throttling device 130.

[0069] After adjusting the opening of the outdoor throttling device 130, the control system runs the adjusted outdoor throttling device 130 for a preset time. The preset time is the set time period. The system determines whether the adjustment of the outdoor throttling device 130 is correct by running the preset time.

[0070] If the adjustment is correct, the system will enter normal operation. At this time, it indicates that there is a manufacturing deviation in the outdoor throttling device 130 and the lower limit threshold setting of the outdoor throttling device 130 is unreasonable. The lower limit threshold needs to be adjusted.

[0071] The above embodiments have the following advantages and effects: When the system is in an abnormal operating state and the opening degree of the outdoor throttling device 130 is at the lower threshold, it is very likely that the system flow regulation is inaccurate due to the manufacturing deviation of the outdoor throttling device 130. At this time, the opening degree of the outdoor throttling device 130 can be adjusted accordingly based on the value fed back by the first system operating parameter 400.

[0072] If the system returns to normal operation after adjusting the opening of the outdoor throttling device 130 and running for a period of time, it indicates that the adjustment method of the outdoor throttling device 130 opening is correct, but the lower limit threshold setting of the outdoor throttling device 130 opening is inaccurate. In this case, the lower limit threshold of the outdoor throttling device 130 can be adjusted accordingly based on the adjustment of the opening size of the outdoor throttling device 130 to ensure that the outdoor throttling device 130 can accurately regulate the flow and that the system can operate stably and reliably.

[0073] In some embodiments of this application, the controller is configured to: It communicates with the sensor assembly to obtain the exhaust temperature 410, intake pressure 420, and exhaust superheat 430.

[0074] When either the exhaust temperature 410 or the intake pressure 420 meets the first preset condition, the opening of the outdoor throttling device 130 is increased.

[0075] In some embodiments of this application, the first preset condition is: the exhaust temperature 410 is above a first determination value or the intake pressure 420 is below a second determination value.

[0076] By setting judgment conditions for both exhaust temperature 410 and intake pressure 420 to determine whether they are normal, the actual exhaust temperature 410 and intake pressure 420 detected during system operation can be compared with the above judgment conditions to quickly and accurately determine whether the system operation is abnormal.

[0077] If the exhaust temperature 410 is detected to be above the first determination value or the intake pressure 420 is detected to be below the second determination value and the opening of the outdoor throttling device 130 is at the lower threshold, the exhaust temperature 410 being above the first determination value (exhaust temperature 410 is too high) or the intake pressure 420 being below the second determination value (intake pressure 420 is too low) is most likely caused by excessive throttling of the outdoor throttling device 130 or excessively low opening of the outdoor throttling device 130.

[0078] Therefore, the system should be operated for a preset time at an increased outdoor throttling device opening of 130 degrees before observing whether it enters normal operating condition to make a judgment.

[0079] If the system enters normal operation after a preset time when the opening of the outdoor throttling device 130 is increased, it is determined that the lower limit threshold of the outdoor throttling device 130 is too low, and the lower limit threshold of the outdoor throttling device 130 is controlled to be increased.

[0080] For example, if the initial lower threshold is set to 4, then the lower threshold can be increased to 5.

[0081] If the system continues to run for a preset time after the opening of the outdoor throttling device 130 is increased and then returns to normal, it means that the lower limit threshold of the outdoor throttling device 130 was set too low during the initial operation, which caused over-adjustment during the system operation adjustment process and led to system abnormality. Therefore, raising the lower limit threshold of the outdoor throttling device 130 can ensure the normal and stable operation of the system.

[0082] Reference Figure 5 As shown, the specific control method of the above embodiment includes the following steps: S101. System startup and operation; S102: Collect the first system operating parameters 400; S103: Exhaust temperature 410 is above the first judgment value or intake pressure 420 is below the second judgment value. S104: Obtain the outdoor throttling device opening degree of 130°; S105: Outdoor throttling device opening degree 130 equals the lower limit threshold? S106: When the opening degree of the outdoor throttling device 130 is not equal to the lower threshold, perform other abnormal cause analysis; S107: When the opening degree of the outdoor throttling device 130 is equal to the lower threshold, adjust and increase the opening degree of the outdoor throttling device 130; S108: Preset operating time for the control system; S109: Has the system entered normal operating status? S110: If the system enters normal operating state, increase the lower limit threshold of the outdoor throttling device 130; S111: If the system does not enter normal operating state, perform other abnormal cause analysis.

[0083] In some embodiments of this application, the controller is configured to: Obtain the exhaust temperature of 410°C, the intake pressure of 420°C, and the exhaust superheat of 430°C. When either the exhaust temperature 410 or the exhaust superheat 430 meets the second preset condition, the opening of the outdoor throttling device 130 is reduced.

[0084] The second preset condition is: the exhaust temperature 410 is below the first judgment value or the exhaust superheat 430 is below the third judgment value.

[0085] By setting judgment conditions for both exhaust temperature 410 and exhaust superheat 430 to determine whether they are normal, the actual exhaust temperature 410 and intake pressure 420 detected during system operation can be compared with the above judgment conditions to quickly and accurately determine whether the system operation is abnormal.

[0086] If the exhaust temperature 410 is detected to be below the first determination value or the exhaust superheat 430 is detected to be below the third determination value, and the opening of the outdoor throttling device 130 is at the lower limit threshold, the situation where the exhaust temperature 410 is below the first determination value (exhaust temperature 410 is too low) or the exhaust superheat 430 is below the third determination value (exhaust superheat 430 is too low) is most likely caused by insufficient throttling of the outdoor throttling device 130 or excessive opening of the outdoor throttling device 130.

[0087] Therefore, after reducing the outdoor throttling device opening by 130 degrees for a preset time, we can then check whether the system enters normal operation to make a judgment.

[0088] If the system enters normal operation after a preset time period following the reduction of the opening of the outdoor throttling device 130, it can be determined that the lower limit threshold of the outdoor throttling device 130 is too high, and the lower limit threshold of the outdoor throttling device 130 can be lowered.

[0089] For example, if the initial lower threshold is set to 4, then the lower threshold can be lowered to 3.

[0090] If the system continues to run for a preset time after the opening of the outdoor throttling device 130 increases and then returns to normal, it indicates that the lower limit threshold of the outdoor throttling device 130 was set too high during the initial operation. This caused the flow rate to be too high even though the opening of the outdoor throttling device 130 had reached the lower limit threshold during normal adjustment, resulting in abnormal system operation. Therefore, lowering the lower limit threshold of the outdoor throttling device 130 can ensure the normal and stable operation of the system.

[0091] Reference Figure 6 As shown, the specific control method of the above embodiment includes the following steps: S201. System startup and operation; S202: Collect the first system operating parameters 400; S203: Exhaust temperature 410 is below the first judgment value or exhaust superheat 430 is below the third judgment value. S204: Obtain the outdoor throttling device opening at 130 degrees; S205: Outdoor throttling device opening degree 130 equals the lower limit threshold? S206: Analysis of other abnormal causes when the opening degree of the outdoor throttling device 130° is not equal to the limit threshold; S207: When the opening degree of the outdoor throttling device 130 is equal to the limit threshold, adjust and reduce the opening degree of the outdoor throttling device 130. S208: Preset operating time for the control system; S209: Has the system entered normal operating status? S210: If the system enters normal operating state, lower the lower limit threshold of the outdoor throttling device 130; S211: If the system does not enter normal operating state, perform other abnormality analysis.

[0092] In some embodiments of this application, the controller pre-stores multiple outdoor unit temperature ranges 510, each outdoor unit temperature range 510 includes multiple indoor unit temperature ranges 520, each indoor unit temperature range 520 includes multiple compressor frequency ranges 530, and each outdoor unit temperature range, indoor unit temperature range and compressor frequency range corresponds to a set of first system operating parameter judgment values, the first system operating parameter judgment values ​​including but not limited to a first judgment value of exhaust temperature, a second judgment value of intake pressure and a third judgment value of exhaust superheat.

[0093] The control unit first determines the outdoor unit's temperature range. After identifying the current outdoor unit's temperature range, it then determines the indoor unit's temperature range. Once the indoor unit's temperature range is selected, the compressor's frequency range is determined. After these step-by-step determinations, the first, second, and third determination values ​​corresponding to the current operating condition can be obtained.

[0094] Based on the selected first, second, and third judgment values, a precise determination can be made as to whether the current system is operating abnormally.

[0095] In some embodiments of this application, an air conditioning system is proposed, comprising: Outdoor unit 100, the outdoor unit 100 having compressor 110, outdoor heat exchanger 120 and outdoor throttling device 130; Indoor unit 200 includes an indoor heat exchanger and is connected to outdoor unit 100 via refrigerant piping; Sensor components are used to detect the first system operating parameter 400; The controller is configured to acquire the opening degree of the outdoor throttling device 130 when the system is determined to be in a shutdown state due to an operational abnormality.

[0096] When the unit experiences an abnormal shutdown during heating operation, the opening degree of the outdoor throttling device 130 is first obtained and its opening degree is determined. Then, it is determined whether the abnormal shutdown of the system is due to the outdoor throttling opening being at the lower threshold, or whether the shutdown is caused by inaccurate adjustment of the opening degree due to manufacturing deviation of the outdoor throttling device 130.

[0097] When it is determined that the opening degree of the outdoor throttling device 130 is at the lower limit threshold of the preset throttling range, the first system operating parameter 400 and the second system operating parameter at the time of shutdown are obtained, and the opening degree of the outdoor throttling device 130 is adjusted based on the first system operating parameter 400 at the time of shutdown.

[0098] The first system operating parameter 400 mainly includes the exhaust temperature 410, intake pressure 420, and exhaust superheat 430.

[0099] The opening degree of the outdoor throttling device 130 is adjusted according to the value of the first system operating parameter 400 at the time of shutdown.

[0100] Adjusting the opening degree of the outdoor throttling device 130 includes increasing or decreasing the first preset value based on the lower limit threshold, thereby increasing or decreasing the opening degree of the outdoor throttling device 130.

[0101] Whether the outdoor throttling device 130 is adjusted to increase or decrease its opening is determined by the first system operating parameter 400 value.

[0102] The system operates for a second preset time based on the second system operating parameters at the time of shutdown and the adjusted opening of the outdoor throttling device 130. If the system enters normal operation after the preset time, the lower limit threshold of the outdoor throttling device 130 is adjusted. The adjustment of the lower limit threshold is determined based on the opening degree adjustment of the outdoor throttling device 130.

[0103] After adjusting the opening of the outdoor throttling device 130, the system is restarted. At the same time, the second system operating parameters at the time of system shutdown and the adjusted opening of the outdoor throttling device 130 are used as the target values ​​for operation in the system. After the system has been running continuously for a preset time, it is checked whether the system has entered the normal operating state.

[0104] If the system enters normal operation, it means that the operating parameters of the second system before the system shutdown were not the problem, but the lower limit threshold setting of the outdoor throttling device 130 was inaccurate and needs to be adjusted.

[0105] The second system operating parameters include, but are not limited to: compressor frequency, fan speed, indoor unit operating status, etc.

[0106] The above embodiments have the following advantages and effects: When the system is in an abnormal shutdown state and the opening degree of the outdoor throttling device 130 is at the lower limit threshold, the abnormal shutdown is most likely caused by the manufacturing deviation of the outdoor throttling device 130, which causes the opening degree to be at the lower limit threshold. In order to determine the rationality of the lower limit threshold, the opening degree of the outdoor throttling device 130 can be adjusted accordingly based on the value fed back by the first system operating parameter 400 at the time of shutdown.

[0107] If the system returns to normal operation after the second system operating parameters before shutdown and the adjusted opening of the outdoor throttling device 130 are restarted within a preset time, it indicates that the lower limit threshold setting of the outdoor throttling device 130 opening is inaccurate. In this case, the lower limit threshold of the outdoor throttling device 130 can be adjusted accordingly based on the adjustment of the opening size of the outdoor throttling device 130 to ensure that the outdoor throttling device 130 can accurately regulate the flow rate and that the system can operate stably and reliably.

[0108] In some embodiments of this application, the controller is configured to increase the opening degree of the outdoor throttling device 130 when either the exhaust temperature 410 or the intake pressure 420 meets a third preset condition.

[0109] In some embodiments of this application, the third preset condition is: the exhaust temperature 410 is above the fourth determination value or the intake pressure 420 is below the fifth determination value.

[0110] By setting conditions for determining whether the exhaust temperature 410 and intake pressure 420 are normal, the actual exhaust temperature 410 and intake pressure 420 detected during system operation can be compared with the above conditions to quickly and accurately determine the cause of system abnormality.

[0111] If the exhaust temperature 410 is above the fourth judgment value or the intake pressure 420 is below the fifth judgment value and the outdoor throttling device 130 is at the lower limit threshold, the situation where the exhaust temperature 410 is above the fourth judgment value (exhaust temperature 410 is too high) or the intake pressure 420 is below the fifth judgment value (intake pressure 420 is too low) is most likely caused by excessive throttling of the outdoor throttling device 130 or excessively low opening of the outdoor throttling device 130.

[0112] Therefore, first increase the opening of the outdoor throttling device by 130 degrees to allow the system to restart and then observe whether the system enters normal operating condition to make a further judgment.

[0113] When the system enters normal operation after determining the second system operating parameters based on the shutdown and the preset time of operation of the increased outdoor throttling device 130, it is determined that the lower limit threshold of the outdoor throttling device 130 is too low, and the lower limit threshold of the outdoor throttling device 130 is increased.

[0114] The system will re-run the system using the second system operating parameters at the time of shutdown and the increased opening of the outdoor throttling device 130 as the operating target values, and will continue to run for a preset time before returning to normal. This indicates that the lower limit threshold of the outdoor throttling device 130 was set too low during the initial operation, which caused over-adjustment during the system operation adjustment process. As a result, the actual opening of the outdoor throttling device 130 was too low, causing the system to malfunction and shut down. Therefore, increasing the lower limit threshold of the outdoor throttling device 130 can ensure the normal and stable operation of the system.

[0115] The above embodiments have the following advantages and effects: When the outdoor throttling device 130 is detected to be at the lower threshold and the exhaust temperature 410 or intake pressure 420 meets the third preset condition, the abnormal system shutdown is most likely caused by the manufacturing deviation of the outdoor throttling device 130, which causes the system flow regulation to be inaccurate when the opening is at the lower threshold. If the system is restarted for a preset time with the second system operating parameters at the time of shutdown and the increased opening of the outdoor throttling device 130, and the system returns to normal operation, it can be determined that the lower threshold of the outdoor throttling device 130 is set too low. Adjusting the lower threshold can ensure the stable operation of the system.

[0116] Reference Figure 7 As shown, the specific control method of the air conditioning system in the above embodiment includes the following steps: S301. System malfunction and shutdown; S302: Obtain the outdoor throttling device opening degree of 130° when the unit is stopped; S303: When the unit is stopped, the outdoor throttling device 130 opening is at the lower limit threshold? S304: Analysis of other abnormal causes when the opening degree of the outdoor throttling device 130° is not equal to the lower threshold; S305: When the outdoor throttling device 130 opening is equal to the limit threshold, the exhaust temperature 410 is above the fourth judgment value or the intake pressure 420 is below the fifth judgment value. S306: When the exhaust temperature 410 is above the fourth judgment value or the intake pressure 420 is below the fifth judgment value, adjust and increase the opening of the outdoor throttling device 130. S307: The second system operating parameters and the increased opening degree of the outdoor throttling device 130 when the system is shut down are used as the operating target values ​​and run in the system for a preset time; S308: Has the system entered normal operating status? S309: If the system enters normal operating state, raise the lower limit threshold of the outdoor throttling device 130; S310: If the system does not enter normal operating state, perform other abnormal cause analysis.

[0117] In some embodiments of this application, the controller is configured to reduce the opening degree of the outdoor throttling device 130 when one of the exhaust temperature 410 and the exhaust superheat 430 meets a fourth preset condition.

[0118] In some embodiments of this application, the fourth preset condition is: the exhaust temperature 410 is below the fourth determination value or the exhaust superheat 430 is below the sixth determination value.

[0119] By setting conditions for determining whether the exhaust temperature 410 and exhaust superheat 430 are normal, the actual exhaust temperature 410 and exhaust superheat 430 detected during system operation can be compared with the above-mentioned conditions to quickly and accurately determine the cause of system abnormality.

[0120] When the exhaust temperature 410 is below the fourth judgment value or the exhaust superheat 430 is below the sixth judgment value, and the opening of the outdoor throttling device 130 is at the lower limit threshold, the situation where the exhaust temperature 410 is below the fourth judgment value (exhaust temperature too low) or the exhaust superheat 430 is below the sixth judgment value (exhaust superheat too low) is most likely caused by insufficient throttling of the outdoor throttling device 130 or excessive opening of the outdoor throttling device 130.

[0121] Therefore, after reducing the outdoor throttling device opening by 130 degrees to allow the system to restart for a preset time, we can then observe whether the system returns to normal operation for further evaluation.

[0122] If the system enters normal operation after a preset time based on the second system operating parameters at the time of shutdown and the reduced opening of the outdoor throttling device 130, it is determined that the lower limit threshold of the outdoor throttling device 130 is too high, and the lower limit threshold of the outdoor throttling device 130 is controlled to be reduced.

[0123] The system will use the second system operating parameters at the time of shutdown and the reduced opening of the outdoor throttling device 130 as the operating target values ​​to run the system again. After a preset time, it will return to the normal state. This indicates that the lower limit threshold of the outdoor throttling device 130 was set too high during the initial operation. Although the opening of the outdoor throttling device 130 has reached the lower limit threshold, the flow rate is still too high, causing abnormal system operation. Therefore, reducing the lower limit threshold of the outdoor throttling device 130 can ensure the normal and stable operation of the system.

[0124] Reference Figure 8 As shown, the specific control method of the air conditioning system in the above embodiment includes the following steps: S401. System malfunction and shutdown; S402: Obtain the outdoor throttling device opening degree of 130° when the unit is stopped; S403: When the unit is stopped, the outdoor throttling device 130 opening is at the lower limit threshold? S404: Analysis of other abnormal causes when the outdoor throttling device 130 opening degree is not at the lower limit threshold; S405: When the outdoor throttling device 130 is at the lower threshold, the exhaust temperature 410 is below the fourth judgment value or the exhaust superheat 430 is below the sixth judgment value. S306: If the exhaust temperature 410 is below the fourth judgment value or the exhaust superheat 430 is below the sixth judgment value, adjust and reduce the opening of the outdoor throttling device 130. S307: The operating parameters of the second system when the system is shut down and the reduced opening of the outdoor throttling device 130 are used as the operating target values ​​and run in the system for a preset time; S308: Has the system entered normal operating status? S309: If the system enters normal operating state, lower the lower limit threshold of the outdoor throttling device 130; S310: If the system does not enter normal operating state, perform other abnormal cause analysis.

[0125] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0126] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning system, characterized in that, Including: Outdoor unit, the outdoor unit has: Compressor, outdoor heat exchanger, and outdoor throttling device; Sensor components are used to acquire the operating parameters of the first system; Indoor units include: An indoor heat exchanger, wherein the indoor heat exchanger is connected to the outdoor heat exchanger via refrigerant piping; The controller is configured to: determine whether the system is operating abnormally based on the first system operating parameters; and, when the system is determined to be abnormal and the operating state is maintained, acquire the opening degree of the outdoor throttling device. When the opening degree of the outdoor throttling device is determined to be at the lower limit threshold of the preset throttling range, the opening degree of the outdoor throttling device is adjusted based on the operating parameters of the first system. If the system enters normal operation after a preset time from when the outdoor throttling device opening is adjusted, the lower limit threshold of the outdoor throttling device will be adjusted according to the outdoor throttling device opening adjustment. The first system operating parameters include exhaust temperature, intake pressure, and exhaust superheat. If either the exhaust temperature or intake pressure meets the first preset condition, or if either the exhaust temperature or exhaust superheat meets the second preset condition, the system is determined to be abnormal; otherwise, the system is determined to be in normal operating condition.

2. The air conditioning system according to claim 1, characterized in that, The controller is configured as follows: When either the exhaust temperature or the intake pressure meets the first preset condition, the opening of the outdoor throttling device is increased. When the system enters normal operation after a preset time period following the increase in the opening of the outdoor throttling device, the lower limit threshold of the outdoor throttling device is increased.

3. The air conditioning system according to claim 2, characterized in that, The first preset condition is: the exhaust temperature is above the first judgment value or the intake pressure is below the second judgment value.

4. The air conditioning system according to claim 1, characterized in that, The controller is configured as follows: When either the exhaust temperature or the exhaust superheat meets the second preset condition, the opening of the outdoor throttling device is reduced. The control unit is configured to control the lower limit threshold of the outdoor throttling device to decrease when the system enters normal operation after a preset time has elapsed since the system adjusts the opening of the outdoor throttling device to decrease.

5. The air conditioning system according to claim 4, characterized in that, The second preset condition is: the exhaust temperature is below the first judgment value or the exhaust superheat is below the third judgment value.

6. An air conditioning system, characterized in that, Including: The outdoor unit has the following features: Compressor, outdoor heat exchanger, and outdoor throttling device; Sensor components are used to acquire the operating parameters of the first system; Indoor units include: The indoor heat exchanger is connected to the outdoor unit via refrigerant piping. The controller is configured to: when it is determined that the system is in a shutdown state due to an operational abnormality, acquire the opening degree of the outdoor throttling device at the time of shutdown; When the opening of the outdoor throttling device is determined to be at the lower limit of the preset throttling range, the first system operating parameters and the second system operating parameters at the time of system shutdown are obtained, and the opening of the outdoor throttling device is adjusted based on the first system operating parameters at the time of shutdown. Based on the second system operating parameters at the time of shutdown and the preset time for the outdoor throttling device opening control system to restart, when the system enters normal operation after the preset time is determined, the lower limit threshold of the outdoor throttling device is adjusted according to the adjustment of the outdoor throttling device opening. The first system operating parameters include exhaust temperature, intake pressure and exhaust superheat, while the second system operating parameters are the hardware operating parameters of the multi-split air conditioning system in the shutdown state. If either the exhaust temperature or the intake pressure meets the third preset condition, or if either the exhaust temperature or the exhaust superheat meets the fourth preset condition, the system is determined to shut down due to abnormal operation.

7. The air conditioning system according to claim 6, characterized in that, The controller is configured as follows: When either the exhaust temperature or the intake pressure meets the third preset condition, the opening of the outdoor throttling device is increased. When the system enters normal operation after determining the second system operating parameters based on the shutdown and adjusting the increased outdoor throttling device opening for a preset time, the lower limit threshold of the outdoor throttling device is increased.

8. The air conditioning system according to claim 6, characterized in that, The controller is configured to reduce the opening of the outdoor throttling device when either the exhaust temperature or the exhaust superheat meets a fourth preset condition. When the system enters normal operation after determining the second system operating parameters based on the shutdown and adjusting the reduced outdoor throttling device opening for a preset time, the lower limit threshold of the outdoor throttling device is controlled to be lowered.

9. The air conditioning system according to claim 7, characterized in that, The third preset condition is: the exhaust temperature is above the fourth judgment value or the intake pressure is below the fifth judgment value.

10. The air conditioning system according to claim 8, characterized in that, The fourth preset condition is: the exhaust temperature is below the fourth judgment value or the exhaust superheat is below the sixth judgment value.

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