Air conditioner control method in ultra-low temperature and ultra-low load state, air conditioner equipment and data center

Abstract

The application discloses an air conditioner control method in an ultralow-temperature and ultralow-load state. The method comprises the following steps: when the ambient temperature of an outdoor unit of an air conditioner is lower than a first set temperature, determining whether the return air temperature of an indoor unit is lower than a second set value; if the return air temperature of the indoor unit is lower than the second set value, determining whether the air conditioner meets an oil return condition; if the air conditioner meets the oil return condition, controlling the air conditioner to return oil; and after the oil return is completed, controlling the air conditioner to enter a shutdown state.

Description

Technical Field

[0001] This application relates to the field of air conditioning, and in particular to an air conditioning control method, air conditioning equipment, and data center under ultra-low temperature and ultra-low load conditions. Background Technology

[0002] In related technologies, when an air conditioner enters low-load mode, the compressor operates at low frequency for a period before returning oil. This high-frequency oil return operation can cause excessively low pressure in the air conditioning system, triggering a low-pressure protection alarm. Multiple low-pressure alarms can lead to low-pressure lockout, causing the air conditioner to shut down and the server to overheat, posing a significant risk. Furthermore, prolonged low-frequency operation can leave residual oil from the compressor within the system, potentially causing dry friction in the compressor and damaging the unit over time. Summary of the Invention

[0003] In view of this, embodiments of this application provide an air conditioning control method and an inverter parallel system under ultra-low temperature and ultra-low load conditions.

[0004] The technical solution of this application embodiment is implemented as follows:

[0005] This application provides an air conditioning control method under ultra-low temperature and ultra-low load conditions, the method comprising:

[0006] When the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature, determine whether the return air temperature of the indoor unit is lower than the second set value.

[0007] If the return air temperature of the indoor unit is lower than the second set value, it is determined whether the air conditioner meets the oil return condition;

[0008] If the air conditioner meets the oil return conditions, then control the air conditioner to return oil;

[0009] After the oil return process is completed, the air conditioner is controlled to enter the shutdown state.

[0010] In the above scheme, after determining whether the air conditioner meets the oil return conditions, the method further includes:

[0011] If the air conditioner does not meet the oil return conditions, the air conditioner will be controlled to enter a shutdown state.

[0012] In the above scheme, determining whether the air conditioner meets the oil return conditions includes:

[0013] When the compressor of the air conditioner reaches the first set oil return cycle, it is determined that the air conditioner meets the oil return conditions.

[0014] In the above solution, the outdoor unit of the air conditioner includes a low-temperature component, which includes a liquid receiver and a flow regulating device. The flow regulating device is used to regulate the inflow and outflow of refrigerant in the liquid receiver. The method further includes:

[0015] When the air conditioner is in cooling mode or dehumidification mode, the opening degree of the flow regulating device is gradually reduced, and the adjustment time of the flow regulating device is extended.

[0016] In the above solution, the outdoor unit of the air conditioner includes an electric heating belt, which is used to heat the low-temperature component. The method further includes:

[0017] Determine the pressure value inside the storage tank;

[0018] When the pressure value is less than the threshold, the electric heating belt is controlled to start heating.

[0019] In the above scheme, when the ambient temperature where the outdoor unit of the air conditioner is located is lower than the first set temperature, the method further includes:

[0020] The duration of oil return from the air conditioner is adjusted from the second set oil return duration to the first set oil return duration, wherein the first set oil return duration is less than the second set oil return duration.

[0021] In the above solution, controlling the air conditioner to enter a shutdown state includes:

[0022] Control the compressor of the air conditioner to stop running.

[0023] This application provides an air conditioning control device under ultra-low temperature and ultra-low load conditions, the device comprising:

[0024] The first determining module is used to determine whether the return air temperature of the indoor unit is lower than the second set value when the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature.

[0025] The second determining module is used to determine whether the air conditioner meets the oil return condition if the return air temperature of the indoor unit is lower than the second set value.

[0026] The first control module is used to control the air conditioner to return oil if the air conditioner meets the oil return conditions;

[0027] The second control module is used to control the air conditioner to enter the shutdown state after the oil return is completed.

[0028] This application also provides an air conditioning device, including: a processor and a memory for storing a computer program that can run on the processor, wherein the processor, when running the computer program, performs the steps in the above-described method.

[0029] In the above scheme, the air conditioning equipment further includes a low-temperature component, which includes a liquid storage tank and a flow regulating device. The processor is configured to gradually reduce the opening degree of the flow regulating device and extend the regulation time of the flow regulating device when the air conditioner is in cooling mode or dehumidification mode.

[0030] In the above scheme, the outdoor unit of the air conditioner includes an electric heating belt, which is used to heat the low-temperature component. The processor is configured to control the electric heating belt to start heating when the pressure value in the liquid storage tank is less than a threshold.

[0031] This application also provides a computer storage medium storing a computer program, which, when executed by a processor, implements the steps in the above method.

[0032] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described method.

[0033] This application also provides a data center, which includes server racks and the aforementioned air conditioning equipment.

[0034] In this embodiment, when the ambient temperature of the outdoor unit of the air conditioner is lower than a first set temperature, it determines whether the return air temperature of the indoor unit is lower than a second set value. If the return air temperature of the indoor unit is lower than the second set value, it determines whether the air conditioner meets the oil return condition. If the air conditioner meets the oil return condition, it controls the air conditioner to perform oil return, and after the oil return is completed, it controls the air conditioner to enter a shutdown state. This embodiment, by first determining whether the air conditioner needs to perform oil return when the return air temperature of the indoor unit is lower than the second set value, and then shutting down the unit after the oil return is completed, can avoid damage to the compressor due to dry friction when the air conditioner is turned on again, ensuring the oil return effect of the unit. Furthermore, controlling the air conditioner to shut down when the return air temperature is lower than the second set value can prevent the system pressure from further decreasing and avoid low-pressure protection. Attached Figure Description

[0035] Figure 1 This is a flowchart illustrating an air conditioning control method under ultra-low temperature and ultra-low load conditions provided in an embodiment of the present invention.

[0036] Figure 2 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of an air conditioning device provided in an embodiment of this application. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In data center scenarios, air conditioning units cool servers placed in racks, ensuring the normal operation of the data center. If the server application load is low, far below 30% or even 10% of the air conditioner's cooling capacity, this is called ultra-low load. For example, if the air conditioner has a cooling capacity of 3.5kW and the actual server load is 200W, this is far below 10% of the air conditioner's requirement and can be considered ultra-low load.

[0040] Low load means less heat, so the air conditioner doesn't need to be run at high intensity, hence it operates at low frequency. However, to ensure unit stability, low-frequency operation causes lubricating oil for the compressor to remain in the system. Over time, this can lead to dry friction in the compressor and damage to the unit. Therefore, after a period of low-frequency operation, the compressor frequency needs to be increased to quickly circulate the refrigerant and return the oil. Low frequency generally refers to the lowest frequency, while the oil return frequency is usually relatively high. However, when the outdoor ambient temperature is very low, the overall system pressure is low. If high-frequency operation is initiated, the low pressure will be further reduced, potentially triggering low-pressure protection.

[0041] Under different operating conditions, the air conditioning unit is in different operating states.

[0042] During normal operation (normal temperature, normal load conditions): After the air conditioner return air temperature drops to the range, it remains stable. The compressor maintains a certain frequency of stable output to ensure the temperature difference between the hot and cold aisles, so that the cold aisle temperature is maintained at 18~27℃.

[0043] Mildly Severe Operating Conditions (Normal Temperature, Low Load): When the actual load is less than 30% of the system's cooling capacity, it can be considered a low load. Under these conditions, the unit can operate relatively easily and stably, mainly because of the low-load cooling mode. As the return air temperature decreases, the compressor frequency also decreases. Once the return air temperature reaches the target value, the unit operates stably at the lowest operating frequency to maintain a stable return air temperature. Because it is at normal temperature, the system's high and low pressures can also be maintained within a reasonable range, preventing abnormal alarms and damage to the unit.

[0044] Moderately harsh operating conditions (low temperature, ultra-low load conditions): The original operating range of the unit is -10℃ to 45℃, but the load conditions encountered are designed and used based on the requirement of more than 30% load. At present, with the increase in the application range of the market, it is necessary to consider the ultra-low load (10%) situation. However, ultra-low load has risks. At ultra-low load, because the air conditioner is inside the cabinet, the return air temperature in the hot aisle rises slowly, and the temperature may not even reach the target temperature. As the air conditioner is turned on, it rises to the start-up platform, and after rising to a certain frequency, it is very likely to pull the temperature down below the target temperature value. That is, the required cooling capacity exceeds the actual load. After entering the normal low load mode, there is a risk of low pressure when the oil return is running at high frequency.

[0045] Extremely harsh operating conditions (ultra-low temperature, ultra-low load conditions): When the temperature is below -10℃, a cryogenic component (electronic expansion valve (EEV) + liquid receiver) is often configured and installed at the outdoor condenser outlet. The cryogenic component plays the role of liquid supply. The liquid supply flow rate can be adjusted through the EEV to ensure that the outdoor unit has a certain liquid supply pressure when the ambient temperature is low, and to avoid liquid slugging when the compressor is started. However, in reality, since configuring a cryogenic component requires adding more refrigerant, in a low-temperature environment, the refrigerant accumulates in the liquid receiver and does not circulate, which will also cause insufficient system pressure.

[0046] For moderate and severe conditions, the relevant technologies control the system to operate under low load. When the system enters low load mode, the unit operates at low frequency for a period before performing oil return. High-frequency oil return operation leads to excessively low pressure, triggering low-pressure protection. After three repetitions, low-pressure lockout occurs, causing the air conditioner to shut down and the server to overheat, posing a significant risk. Secondly, prolonged low-frequency operation prevents the establishment of a system pressure differential, easily causing compressor wear and other problems. Furthermore, the related technology uses a small electronic expansion valve opening and a short refrigerant supply time, resulting in low refrigerant mass flow rate in the evaporator coil and excessively low pressure.

[0047] To address the shortcomings of related technologies, embodiments of the present invention provide an air conditioning control method under ultra-low temperature and ultra-low load conditions, referencing... Figure 1 This method is applied to air conditioning units and may include:

[0048] S101, when the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature, determine whether the return air temperature of the indoor unit is lower than the second set value.

[0049] An air conditioner consists of an outdoor unit and an indoor unit, connected by pipes and wires. The indoor unit is responsible for blowing air into the room to maintain the room temperature within a comfortable range, while the outdoor unit cools or heats the room and removes heat from the room.

[0050] This application's embodiments can be applied in extreme environments. For example, if the first set temperature is -10℃, and the ambient temperature of the outdoor unit is below -10℃, it checks whether the return air temperature of the indoor unit reaches the target temperature (second set value). For example, if the second set value is set to 28℃, this is the target value. Data center air conditioners are generally controlled according to the return air temperature, which is typically set to the return air temperature, usually between 28 and 35℃. If the return air temperature of the indoor unit is lower than the second set value, the air conditioner is controlled to enter the temperature-reaching shutdown mode. Before shutting down, it is necessary to check whether the air conditioner needs oil return.

[0051] In other embodiments, the set temperature can also be the air supply temperature of the indoor unit, and the corresponding second set value can be 18~23℃. Correspondingly, when the air supply temperature of the indoor unit is lower than the second set value, it is determined whether the air conditioner meets the oil return condition.

[0052] S102, if the return air temperature of the indoor unit is lower than the second set value, then determine whether the air conditioner meets the oil return condition.

[0053] Air conditioning oil return refers to the process by which lubricating oil, after being discharged from the compressor, is carried back to the compressor by the refrigerant to ensure its normal operation. In air conditioning systems, lubricating oil not only lubricates but also helps dissipate heat and reduce wear. During operation, the compressor requires lubricating oil to reduce wear and prevent overheating. Some lubricating oil is discharged with the refrigerant gas, entering the condenser, piping, and evaporator within the system. To maintain the dynamic balance of the oil in the system, this lubricating oil needs to smoothly return to the compressor.

[0054] Therefore, in this embodiment, when the return air temperature of the indoor unit is lower than the second set value, it detects whether the current air conditioner meets the oil return conditions. Typically, an oil return cycle can be set, and oil return is performed according to a time period. It can then be determined whether the current time matches the oil return cycle; if they do, oil return is required.

[0055] S103, if the air conditioner meets the oil return conditions, then control the air conditioner to return oil.

[0056] For example, the operating frequency of the air conditioner compressor can be increased to facilitate oil return by rapidly circulating the refrigerant.

[0057] If the air conditioner meets the oil return conditions and is currently in the oil return state, then continue the oil return process.

[0058] If the air conditioner meets the oil return conditions and the compressor has just stopped, it means that the oil return has been completed, and there is no need to return oil again. It can directly enter S104.

[0059] Specifically, during oil return, the oil return process can be stopped when the evaporation pressure reaches the lower limit point +0.2 Bar.

[0060] S104, after completing the oil return process, control the air conditioner to enter the shutdown state.

[0061] In this embodiment, after completing the oil return process, the air conditioner is controlled to enter a shutdown state, achieving temperature-controlled shutdown. Firstly, at this point, the return air temperature of the indoor unit is below the second set value, ensuring that all server equipment indoors is in a suitable operating environment and will not experience reduced efficiency or shutdown due to high temperatures. Furthermore, after shutdown, the compressor no longer runs, preventing further drop in system pressure and avoiding triggering the low-pressure protection mechanism. Performing oil return before shutdown prevents damage to the compressor due to dry friction when the air conditioner is restarted, effectively protecting and controlling the normal operation of the compressor.

[0062] In this embodiment, when the ambient temperature of the outdoor unit of the air conditioner is lower than a first set temperature, it determines whether the return air temperature of the indoor unit is lower than a second set value. If the return air temperature of the indoor unit is lower than the second set value, it determines whether the air conditioner meets the oil return condition. If the air conditioner meets the oil return condition, it controls the air conditioner to perform oil return, and after the oil return is completed, it controls the air conditioner to enter a shutdown state. This embodiment, by first determining whether the air conditioner needs to perform oil return when the return air temperature of the indoor unit is lower than the second set value, and then shutting down the unit after the oil return is completed, can avoid damage to the compressor due to dry friction when the air conditioner is turned on again, ensuring the oil return effect of the unit. Furthermore, controlling the air conditioner to shut down when the return air temperature is lower than the second set value can prevent the system pressure from further decreasing and avoid low-pressure protection.

[0063] Specifically, when the return air temperature is not lower than the second set value, the air conditioning compressor is controlled to operate at high frequency to ensure the unit's oil return and cooling effect. The ventilation mode time is also reduced to avoid excessive humidity caused by prolonged ventilation.

[0064] In one embodiment, determining whether the air conditioner meets the oil return condition includes:

[0065] When the compressor of the air conditioner reaches the first set oil return cycle, it is determined that the air conditioner meets the oil return conditions.

[0066] For example, if the oil return cycle is 4 hours, the air conditioner will be controlled to return oil when the cumulative oil return counting time reaches the set oil return cycle.

[0067] Among them, when the compressor runs for a period of time until the first set oil return cycle is reached, it is not necessary to distinguish whether the compressor is running continuously or whether there is a shutdown in between.

[0068] Alternatively, multiple oil return time points can be manually set. When the current time matches an oil return time point, the air conditioner will be controlled to return oil.

[0069] In one embodiment, after determining whether the air conditioner meets the oil return condition, the method further includes:

[0070] If the air conditioner does not meet the oil return conditions, the air conditioner will be controlled to enter a shutdown state.

[0071] If the return air temperature of the indoor unit is lower than the second set value and the air conditioner does not meet the oil return conditions, the air conditioner will be directly controlled to enter the shutdown state.

[0072] In one embodiment, the outdoor unit of the air conditioner includes a low-temperature component, the low-temperature component including a liquid receiver and a flow regulating device, the flow regulating device being used to regulate the inflow and outflow of refrigerant in the liquid receiver; the method further includes:

[0073] When the air conditioner is in cooling mode or dehumidification mode, the opening degree of the flow regulating device is gradually reduced, and the adjustment time of the flow regulating device is extended.

[0074] The receiver-dweller (NDD) stores refrigerant and is installed at the outlet of the outdoor condenser. The cryogenic component acts as a refrigerant supply unit, ensuring a certain refrigerant supply pressure for the outdoor unit when the ambient temperature is low and preventing liquid slugging when the compressor starts. The flow regulating device can be an EEV (Extra-Electronic Flow Regulator) to adjust the inflow and outflow of refrigerant in the NDD.

[0075] When the air conditioner is switched to cooling or dehumidification mode under low load, the EEV opening gradually decreases and the adjustment time is extended to meet a certain cooling capacity while ensuring the refrigerant supply time.

[0076] In one embodiment, the flow regulating device can control the flow according to varying superheat levels, and the flow regulating device controls its opening degree according to different superheat levels in different modes. For example, during normal cooling (oil return), the flow regulating device throttles the flow according to the normal superheat level. When operating at low load, the opening degree of the flow regulating device is reduced, and the system throttles the flow according to the high superheat level, ensuring a reduction in the system's output cooling capacity and achieving low-load cooling. Simultaneously, when adjusting for low-temperature environments, the adjustment time of the flow regulating device is extended to ensure sufficient liquid supply time.

[0077] In one embodiment, the outdoor unit of the air conditioner includes an electric heating belt for heating the low-temperature component, and the method further includes:

[0078] Determine the pressure value inside the storage tank;

[0079] When the pressure value is less than the threshold, the electric heating belt is controlled to start heating.

[0080] like Figure 2 As shown, Figure 2This is a schematic diagram of an air conditioning system according to an embodiment of the present invention, including an indoor unit, an outdoor unit, and a low-temperature component. The indoor unit includes an evaporator, the outdoor unit includes a condenser and a compressor, and the low-temperature component includes a liquid receiver tank and a flow regulating device. An electric heating element is deployed on the liquid receiver tank. One end of the low-temperature component is connected to the evaporator, and the other end is connected to the condenser. The flow regulating device is used to regulate the rate at which refrigerant in the condenser enters the evaporator of the indoor unit. When the ambient temperature is too low, the liquid receiver tank can be heated by the electric heating element to increase the refrigerant pressure in the tank. This can increase the system pressure when the system pressure is insufficient, ensuring the normal operation of the air conditioning unit.

[0081] In one embodiment, when the ambient temperature where the outdoor unit of the air conditioner is located is lower than a first set temperature, the method further includes:

[0082] The duration of oil return from the air conditioner is adjusted from the second set oil return duration to the first set oil return duration, wherein the first set oil return duration is less than the second set oil return duration.

[0083] The second set oil return duration can be the default oil return duration of the air conditioning system, which normally performs oil return according to this duration. When the ambient temperature of the outdoor unit is lower than the first set temperature, the oil return duration is adjusted from the second to the first set duration. The first set oil return duration is shorter than the second set duration, allowing for faster oil return and preventing low pressure issues caused by prolonged oil return when the system lacks low-temperature components. For example, the second set oil return duration is 3 minutes, and the first set oil return duration is 1 minute.

[0084] In one embodiment, controlling the air conditioner to enter a shutdown state includes:

[0085] Control the compressor of the air conditioner to stop running.

[0086] The main purpose of the air conditioner entering shutdown mode is to stop the compressor from running, preventing the low pressure from dropping even lower. In one embodiment, the indoor unit can continue to ventilate even after the outdoor unit stops running.

[0087] In this embodiment, when the outdoor unit of the air conditioner is in an extremely cold environment and meets the temperature-reaching shutdown condition, it checks whether the oil return condition is met. The unit only shuts down after the oil return is complete, preventing damage to the compressor due to dry friction when the air conditioner is restarted, thus ensuring the effective oil return of the unit. Furthermore, controlling the air conditioner to shut down when the return air temperature is lower than a second set value prevents further pressure reduction, avoids low-pressure protection, and avoids customer inconvenience caused by frequent alarms.

[0088] In order to implement the method of the embodiments of this application, the embodiments of this application also provide an air conditioning control device under ultra-low temperature and ultra-low load conditions. The air conditioning control device under ultra-low temperature and ultra-low load conditions corresponds to the air conditioning control method under ultra-low temperature and ultra-low load conditions described above. The steps in the embodiments of the air conditioning control method under ultra-low temperature and ultra-low load conditions are also fully applicable to the embodiments of the air conditioning control device under ultra-low temperature and ultra-low load conditions described above.

[0089] The device includes:

[0090] The first determining module is used to determine whether the return air temperature of the indoor unit is lower than the second set value when the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature.

[0091] The second determining module is used to determine whether the air conditioner meets the oil return condition if the return air temperature of the indoor unit is lower than the second set value.

[0092] The first control module is used to control the air conditioner to return oil if the air conditioner meets the oil return conditions;

[0093] The second control module is used to control the air conditioner to enter the shutdown state after the oil return is completed.

[0094] In one embodiment, the device further includes:

[0095] The third control module is used to control the air conditioner to enter a shutdown state if the air conditioner does not meet the oil return conditions.

[0096] In one embodiment, the second determining module is specifically used for:

[0097] When the compressor of the air conditioner reaches the first set oil return cycle, it is determined that the air conditioner meets the oil return conditions.

[0098] In one embodiment, the outdoor unit of the air conditioner includes a low-temperature component, which includes a liquid receiver and a flow regulating device. The flow regulating device is used to regulate the inflow and outflow of refrigerant in the liquid receiver. The device further includes:

[0099] The fourth control module is used to gradually reduce the opening degree of the flow regulating device and extend the adjustment time of the flow regulating device when the air conditioner is in cooling mode or dehumidification mode.

[0100] In one embodiment, the outdoor unit of the air conditioner includes an electric heating belt for heating the low-temperature component, and the device further includes:

[0101] The fifth control module is used to determine the pressure value inside the liquid storage tank; if the pressure value is less than a threshold, it controls the electric heating belt to start heating.

[0102] In one embodiment, the device further includes:

[0103] The sixth control module is used to adjust the oil return duration of the air conditioner from the second set oil return duration to the first set oil return duration, wherein the first set oil return duration is less than the second set oil return duration.

[0104] In one embodiment, the second control module is specifically used for:

[0105] Control the compressor of the air conditioner to stop running.

[0106] In practical applications, the aforementioned first determining module, second determining module, first control module, and second control module can be implemented by a processor in the air conditioning equipment. Of course, the processor needs to run the computer program stored in its memory to perform its functions.

[0107] It should be noted that the air conditioning control device under ultra-low temperature and ultra-low load conditions provided in the above embodiments is only illustrated by the division of the above-described program modules when performing air conditioning control and module training under ultra-low temperature and ultra-low load conditions. In practical applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the processing described above. In addition, the air conditioning control device under ultra-low temperature and ultra-low load conditions provided in the above embodiments and the air conditioning control method embodiments under ultra-low temperature and ultra-low load conditions belong to the same concept, and the specific implementation process is detailed in the method embodiments, which will not be repeated here.

[0108] Based on the hardware implementation of the above program modules, and in order to implement the method of the embodiments of this application, the embodiments of this application also provide an air conditioning device. Figure 3 This is a schematic diagram of the hardware composition structure of the air conditioning equipment in an embodiment of this application, as shown below. Figure 3 As shown, the air conditioning equipment includes:

[0109] A communication interface enables information exchange with other devices, such as network devices.

[0110] The processor, connected to the communication interface, enables information interaction with other devices and, when running a computer program, executes the methods provided by one or more of the above-described technical solutions. The computer program is stored in memory.

[0111] Of course, in practical applications, the various components in an air conditioning unit are coupled together via a bus system. This bus system is used to enable communication and connection between these components. In addition to a data bus, the bus system also includes a power bus, a control bus, and a status signal bus. However, for clarity, in... Figure 3 The general will label all buses as bus systems.

[0112] This application also provides a data center, which includes server racks and the aforementioned air conditioning equipment.

[0113] The memory in this application embodiment is used to store various types of data to support the operation of the computer device. Examples of such data include any computer program used to operate on an air conditioning device.

[0114] In one embodiment, the air conditioning device further includes a low-temperature component, which includes a liquid storage tank and a flow regulating device. The processor is configured to gradually reduce the opening degree of the flow regulating device and extend the regulation time of the flow regulating device when the air conditioning is in cooling mode or dehumidification mode.

[0115] In one embodiment, the outdoor unit of the air conditioner includes an electric heating strip for heating the low-temperature component, and the processor is configured to control the electric heating strip to start heating when the pressure value in the liquid storage tank is less than a threshold.

[0116] It is understood that memory can be volatile or non-volatile, or both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), ferromagnetic random access memory (FRAM), flash memory, magnetic surface memory, optical disc, or compact disc read-only memory (CD-ROM); magnetic surface memory can be disk storage or magnetic tape storage. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM).The memories described in the embodiments of this application are intended to include, but are not limited to, these and any other suitable types of memories.

[0117] The methods disclosed in the embodiments of this application can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor may be a general-purpose processor, a DSP, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. A general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software modules may be located in a storage medium, which is located in memory. The processor reads the program from the memory and, in conjunction with its hardware, completes the steps of the aforementioned method.

[0118] Optionally, when the processor executes the program, it implements the corresponding processes implemented by the computer device in the various methods of the embodiments of this application. For the sake of brevity, these will not be described in detail here.

[0119] In an exemplary embodiment, this application also provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, such as a first memory storing a computer program, which can be executed by a processor of a computer device to complete the steps described in the aforementioned method. The computer-readable storage medium may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM.

[0120] In the several embodiments provided in this application, it should be understood that the disclosed apparatus, computer devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components may be combined, or integrated into another system, or some features may be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0121] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0122] In addition, each functional unit in the various embodiments of this application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0123] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media that can store program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0124] Alternatively, if the integrated units described above are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to related technologies, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0125] In an exemplary embodiment, this application also provides a computer program product, including a computer program that can be executed by a processor of an air conditioning device to complete the steps described in the air conditioning control method under ultra-low temperature and ultra-low load conditions of this application embodiment.

[0126] It should be noted that terms such as "first" and "second" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0127] Furthermore, the technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0128] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method of an air conditioner in an ultra-low temperature and ultra-low load state, characterized by, The method comprises: when the ambient temperature where the outdoor unit of the air conditioner is located is lower than a first set temperature, determining whether the return air temperature of the indoor unit is lower than a second set value; if the return air temperature of the indoor unit is lower than the second set value, determining whether the air conditioner meets the oil return condition; when the running time of the compressor of the air conditioner reaches a first set oil return period, it is determined that the air conditioner meets the oil return condition; if the air conditioner meets the oil return condition, controlling the air conditioner to perform oil return; after completing the oil return, controlling the air conditioner to enter a shutdown state; the outdoor unit of the air conditioner comprises a low-temperature component, the low-temperature component comprises a liquid storage tank and a flow regulating device, the flow regulating device is used to regulate the in-out flow of the refrigerant in the liquid storage tank; the method further comprises: when the air conditioner is in a refrigeration mode or a dehumidification mode, gradually reducing the opening degree of the flow regulating device and prolonging the adjustment time of the flow regulating device.

2. The method of claim 1, wherein, After determining whether the air conditioner meets the oil return condition, the method further comprises: if the air conditioner does not meet the oil return condition, controlling the air conditioner to enter a shutdown state.

3. The method of claim 1, wherein, The outdoor unit of the air conditioner comprises an electric heating belt, the electric heating belt is used to heat the low-temperature component, the method further comprises: determining the pressure value in the liquid storage tank; in the case where the pressure value is less than a threshold value, controlling the electric heating belt to start heating.

4. The method of claim 1, wherein, When the ambient temperature where the outdoor unit of the air conditioner is located is lower than a first set temperature, the method further comprises: adjusting the oil return duration of the air conditioner from a second set oil return duration to a first set oil return duration, the first set oil return duration is less than the second set oil return duration.

5. An air conditioning control device in an ultra-low temperature and ultra-low load state, characterized by, Comprise: a first determination module, configured to determine whether the return air temperature of the indoor unit is lower than a second set value when the ambient temperature where the outdoor unit of the air conditioner is located is lower than a first set temperature; a second determination module, configured to determine whether the air conditioner meets the oil return condition if the return air temperature of the indoor unit is lower than the second set value; when the running time of the compressor of the air conditioner reaches a first set oil return period, it is determined that the air conditioner meets the oil return condition; a first control module, configured to control the air conditioner to perform oil return if the air conditioner meets the oil return condition; a second control module, configured to control the air conditioner to enter a shutdown state after completing the oil return; a fourth control module, configured to gradually reduce the opening degree of the flow regulating device and prolong the adjustment time of the flow regulating device when the air conditioner is in a refrigeration mode or a dehumidification mode. The outdoor unit of the air conditioner comprises a low-temperature component, the low-temperature component comprises a liquid storage tank and the flow regulating device, and the flow regulating device is used to regulate the in-out flow of the refrigerant in the liquid storage tank.

6. An air conditioning apparatus characterized by comprising: Comprise: a processor and a memory for storing a computer program capable of running on the processor, wherein the processor is configured to execute the steps of the method of any one of claims 1 to 4 when running the computer program.

7. The air conditioning apparatus according to claim 6, wherein The air conditioner further comprises a low-temperature component, the low-temperature component comprises a liquid storage tank and a flow regulating device, and the processor is configured to gradually reduce the opening degree of the flow regulating device and prolong the adjustment time of the flow regulating device when the air conditioner is in a refrigeration mode or a dehumidification mode.

8. A data center, characterized by, An air conditioning apparatus including a data center cabinet and any one of claims 6-7.

Images