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

Abstract

The invention discloses an air conditioner control method in an ultralow-temperature and ultralow-load state, which comprises the following steps: when the environment 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 or not; if the return air temperature of the indoor unit is lower than the second set value, whether the air conditioner meets the oil return condition or not is determined; if the air conditioner meets the oil return condition, the air conditioner is controlled to return oil; and after oil return is completed, the air conditioner is controlled to enter a shutdown state.

Description

Technical Field

[0001] The present application relates to the field of inverter technology, and in particular to an air-conditioning control method, air-conditioning equipment and a data center under ultra-low temperature and ultra-low load conditions. Background Art

[0002] In the related technology, when the air conditioner enters the low-load mode, the air conditioner compressor returns oil after a period of low frequency. The high-frequency operation of the oil return will cause the air conditioning system to have too low low pressure, and the air conditioning system will report low-pressure protection. After multiple low-pressure alarms, it will cause low-pressure lock, causing the air conditioner to shut down and the server to heat up, which poses a great risk. Moreover, long-term low-frequency operation will cause the oil that lubricates the compressor to remain in the system, which can easily cause dry friction of the compressor and damage the unit over time. Summary of the invention

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

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

[0005] The embodiment of the present 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, determining 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, determining whether the air conditioner meets the oil return condition;

[0008] If the air conditioner meets the oil return condition, controlling the air conditioner to return oil;

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

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

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

[0012] In the above solution, the step of determining whether the air conditioner meets the oil return condition includes:

[0013] When the operation 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.

[0014] In the above scheme, the air conditioner outdoor unit includes a low-temperature component, the low-temperature component includes a liquid storage tank and a flow regulating device, and the flow regulating device is used to regulate the inlet and outlet flow of the refrigerant in the liquid storage tank; the method also includes:

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

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

[0017] Determining the pressure value in the liquid storage tank;

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

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

[0020] The oil return duration of 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 shorter than the second set oil return duration.

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

[0022] The compressor of the air conditioner is controlled to stop running.

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

[0024] A first determination module, used to determine whether the return air temperature of the indoor unit is lower than a second set value when the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature;

[0025] a second determination module, configured to determine whether the air conditioner satisfies an oil return condition if the return air temperature of the indoor unit is lower than the second set value;

[0026] A first control module, configured to control the air conditioner to return oil if the air conditioner meets an oil return condition;

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

[0028] An embodiment of the present application also provides an air conditioning device, comprising: a processor and a memory for storing a computer program that can be run on the processor, wherein the processor is used to execute the steps in the above method when running the computer program.

[0029] In the above scheme, the air-conditioning equipment also 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 of the flow regulating device and extend the adjustment time of the flow regulating device when the air-conditioning is in cooling mode or dehumidification mode.

[0030] In the above scheme, the air conditioner outdoor unit 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 value.

[0031] An embodiment of the present application further provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method are implemented.

[0032] An embodiment of the present application also provides a computer program product, including a computer program, which implements the steps of the above method when executed by a processor.

[0033] An embodiment of the present application also provides a data center, which includes a cabinet and the above-mentioned air-conditioning equipment.

[0034] In the embodiment of the present application, when the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature, it is determined whether the return air temperature of the indoor unit is lower than the second set value. 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. If the air conditioner meets the oil return condition, the air conditioner is controlled to return the oil, and the air conditioner is controlled to enter the shutdown state after the oil return is completed. In the embodiment of the present application, when the return air temperature of the indoor unit is lower than the second set value, it is first determined whether the air conditioner needs to return the oil, and the air conditioner is shut down after the oil return is completed, which can avoid damage to the compressor due to dry friction when the air conditioner is turned on next time, and ensure the oil return effect of the unit. In addition, when the return air temperature is lower than the second set value, the air conditioner is controlled to shut down, which can avoid further reduction of system pressure and avoid low pressure protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flow chart of an air conditioning control method under ultra-low temperature and ultra-low load conditions provided by an embodiment of the present invention;

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

[0037] Figure 3 It is a structural schematic diagram of an air-conditioning device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the data center scenario, the air conditioning components can cool the servers placed on the cabinets in the data center to ensure the normal operation of the data center. If the server application load is low, far less than 30% of the air conditioner's cooling capacity, or even 10% load, this is called ultra-low load. For example, the air conditioner has a cooling capacity of 3.5kW, and the actual server is 200W, which is far less than 10% of the air conditioner's demand, and can be called ultra-low load.

[0040] Low load means less heat, so the air conditioner does not need to be turned on too hard, so the air conditioner runs at a low frequency. However, to ensure the stability of the unit, low-frequency operation causes the oil used to lubricate the compressor to remain in the system, which can easily cause dry friction in the compressor and damage the unit over a long period of time. Therefore, after running at a low frequency for a period of time, the compressor frequency needs to be increased to quickly circulate the refrigerant and return the oil. Low frequency generally refers to the lowest frequency, and the oil return frequency is generally higher. However, when the outdoor ambient temperature is very low, the pressure of the entire system is low. Once the high-frequency operation is performed, the low pressure is pulled down, which can easily cause low-pressure protection.

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

[0042] During normal operation (normal temperature, normal load conditions): After the air-conditioning return air temperature drops to within the range, it remains stable, and the compressor maintains a certain frequency of stable output to ensure the temperature difference between the cold and hot channels, so that the temperature of the cold channel is maintained at 18-27°C.

[0043] Mildly adverse working conditions (normal temperature, low load conditions): When the actual load is less than 30% of the system cooling capacity, it can be called low load. At this time, the unit can operate stably and easily, mainly because of the low-load cooling mode. As the return air temperature of the unit continues to decrease, the compressor frequency also continues to decrease. When the return air temperature drops to the target temperature value, the unit operates stably at the lowest operating frequency to maintain the stability of the return air temperature. Because it is at normal temperature, the high and low pressures of the system can also be maintained within a reasonable range, avoiding abnormal alarms and damage to the unit.

[0044] Moderately severe working conditions (low temperature, ultra-low load conditions): Since the original setting range of the unit is -10℃~45℃, but at this time, the load conditions encountered are also designed and used based on the demand of more than 30% load. At present, with the increase in the application scope of the market, it is necessary to consider the situation of ultra-low load (10%), but there are risks in ultra-low load. At ultra-low load, because the air conditioner is inside the cabinet, the return air temperature of the hot channel rises slowly, and even the temperature does not reach the target temperature. As the air conditioner is turned on, it rises to the starting platform, and after it rises to a certain frequency, it is very likely to lower the temperature below the target temperature value, that is, the required cooling capacity exceeds the actual load. After entering the normal low-load mode, there may be a risk of low pressure when the return oil is running at a high frequency.

[0045] Extremely harsh working conditions (ultra-low temperature, ultra-low load conditions): When the temperature is lower than -10°C, a low-temperature component (in the form of an electronic expansion valve (EEV) + a liquid storage tank) is often configured and installed at the outdoor condenser outlet. The low-temperature component plays a role in liquid supply. The liquid supply flow rate can be adjusted by EEV to ensure a certain liquid supply pressure when the ambient temperature of the outdoor unit is low, and to avoid liquid hammer when the compressor is started. However, in fact, since the configuration of the low-temperature component requires additional refrigerant, in a low-temperature environment, the refrigerant accumulates in the liquid storage tank and does not circulate, which will also cause insufficient pressure in the system.

[0046] For both moderate and severe conditions, in the relevant technology, the system is controlled to operate at low load and enter low load mode. The unit returns oil after a period of time at low frequency. The high frequency of oil return will cause the low pressure to be too low and the low pressure protection will be reported. After three repetitions, the low pressure is locked, the air conditioner shuts down, and the server heats up, which poses a great risk. Secondly, long-term low-frequency operation cannot establish the pressure difference of the system, which can easily cause problems such as compressor wear. The opening of the electronic expansion valve in the relevant technology is small, and the liquid supply time is short, resulting in a small mass flow of refrigerant in the evaporator coil and too low low pressure.

[0047] In view of the defects of the related art, the embodiment of the present invention provides an air conditioning control method under ultra-low temperature and ultra-low load conditions, referring to Figure 1 , the method is applied to an air conditioning unit, the method may include:

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

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

[0050] The embodiment of the present application can be applied in extreme environments. For example, the first set temperature is -10°C. When the ambient temperature of the outdoor unit is lower than -10°C, check whether the return air temperature of the indoor unit reaches the target temperature (the second set value). For example, the second set value is set to 28°C, which is the target value. The computer room air conditioner is generally controlled according to the return air temperature. The set temperature is the return air temperature, which is generally 28 to 35°C. 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 may also be the air supply temperature of the indoor unit, and the corresponding second set value may be 18-23° C. 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, determine whether the air conditioner meets the oil return condition.

[0053] Air conditioning oil return refers to the process in which the lubricating oil is discharged from the compressor and carried back to the compressor by the refrigerant to ensure the normal operation of the compressor. In the air conditioning system, the lubricating oil not only plays a lubricating role, but also helps to dissipate heat and reduce wear. In the air conditioning system, the compressor needs lubricating oil during operation to reduce wear and prevent overheating. Part of the lubricating oil will be discharged along with the refrigerant gas and enter the condenser, piping and evaporator in the system. In order to maintain the dynamic balance of the oil in the system, the lubricating oil needs to be smoothly returned to the compressor.

[0054] Therefore, when the return air temperature of the indoor unit is lower than the second set value, this embodiment detects whether the current air conditioner meets the oil return condition. Usually, an oil return cycle can be set, and oil return is performed according to the time cycle. At this time, it can be determined whether the current time matches the oil return cycle. If it matches, oil return needs to be performed.

[0055] S103: If the air conditioner meets the oil return condition, control the air conditioner to return oil.

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

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

[0058] If the air conditioner meets the oil return conditions and the compressor happens to stop, it means that the oil return has just been completed and there is no need to return the oil, and the process directly enters S104.

[0059] Among them, when returning oil, the oil return can be exited when the evaporation pressure reaches the lower limit point +0.2Bar.

[0060] S104, controlling the air conditioner to enter a shutdown state after the oil return is completed.

[0061] After the oil return is completed, this embodiment controls the air conditioner to enter the shutdown state to achieve temperature shutdown. First, at this time, the return air temperature of the air conditioner indoor unit is lower than the second set value, which can ensure that various server equipment in the room is in a suitable operating environment and will not reduce work efficiency or shut down due to high temperature. Moreover, after shutdown, the compressor will no longer run, which can prevent the system pressure from further decreasing, and the system will no longer trigger low-pressure protection. Returning oil before shutdown can prevent damage to the compressor due to dry friction when the air conditioner is turned on next time, and effectively protect the normal operation of the control compressor.

[0062] In the embodiment of the present application, when the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature, it is determined whether the return air temperature of the indoor unit is lower than the second set value. 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. If the air conditioner meets the oil return condition, the air conditioner is controlled to return the oil, and the air conditioner is controlled to enter the shutdown state after the oil return is completed. In the embodiment of the present application, when the return air temperature of the indoor unit is lower than the second set value, it is first determined whether the air conditioner needs to return the oil, and the air conditioner is shut down after the oil return is completed, which can avoid damage to the compressor due to dry friction when the air conditioner is turned on next time, and ensure the oil return effect of the unit. In addition, when the return air temperature is lower than the second set value, the air conditioner is controlled to shut down, which can avoid further reduction of system pressure and avoid low pressure protection.

[0063] Among them, when the return air temperature is not lower than the second set value, the air conditioner compressor is controlled to run at a high frequency to ensure the oil return and refrigeration effect of the unit. And the ventilation mode time is reduced to avoid the problem of excessive humidity caused by too long ventilation time.

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

[0065] When the operation 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.

[0066] For example, the oil return cycle is 4 hours. When the accumulated oil return count time reaches the set oil return cycle, the air conditioner is controlled to return the oil.

[0067] When the operating time of the compressor reaches the first set oil return cycle, it is not necessary to determine whether the compressor is continuously running or not, and whether there is any stop in the middle.

[0068] Alternatively, multiple oil return time points can be manually set, and when the current time matches the oil return time point, the air conditioner is 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 condition, the air conditioner is controlled to enter a shutdown state.

[0071] When 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 condition, the air conditioner is directly controlled to enter the shutdown state.

[0072] In one embodiment, the air conditioner outdoor unit includes a low-temperature component, the low-temperature component includes a liquid storage tank and a flow regulating device, and the flow regulating device is used to regulate the inlet and outlet flow of the refrigerant in the liquid storage tank; the method also includes:

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

[0074] The liquid storage tank is used to store refrigerant and is installed at the outlet of the outdoor condenser. The low-temperature component plays a role in supplying liquid, which can ensure a certain liquid supply pressure when the ambient temperature of the outdoor unit is low, and avoid liquid hammer when the compressor is turned on. The flow regulating device can be an EEV, which can adjust the inlet and outlet flow of the refrigerant in the liquid storage tank.

[0075] At low load, when the air conditioner switches to cooling mode or dehumidification mode, the EEV opening gradually decreases and the adjustment time is extended, meeting a certain cooling capacity while also ensuring the liquid supply time.

[0076] In one embodiment, the flow regulating device can be controlled according to the change of superheat, and in different modes, the flow regulating device controls the opening according to different superheat. For example, when cooling normally (returning oil), the flow regulating device throttles according to the normal superheat control. When running at low load, the opening of the flow regulating device is reduced, and the system throttles according to the high superheat to ensure that the system output cooling capacity is reduced and low-load cooling is achieved. At the same time, when adjusting the low-temperature environment, the adjustment time of the flow regulating device is extended to ensure sufficient liquid supply time.

[0077] In one embodiment, the air conditioner outdoor unit includes an electric heating belt, and the electric heating belt is used to heat the low-temperature component. The method further includes:

[0078] Determining the pressure value in the liquid storage tank;

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

[0080] like Figure 2 As shown, Figure 2It is a structural schematic diagram of an air-conditioning system provided by 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, the low-temperature component includes a liquid storage tank and a flow regulating device, and an electric heating belt is disposed on the liquid storage 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 adjust the speed at which the refrigerant in the condenser enters the evaporator of the indoor unit. When the ambient temperature is too low, the liquid storage tank can be heated by the electric heating belt to increase the refrigerant pressure in the liquid storage tank. When the system pressure is insufficient, the system pressure can be increased to ensure the normal operation of the air-conditioning unit.

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

[0082] The oil return duration of 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 shorter than the second set oil return duration.

[0083] Among them, the second set oil return time can be the default oil return time of the air conditioning system. Under normal circumstances, the air conditioner returns oil according to the second set oil return time. When the ambient temperature of the outdoor unit is lower than the first set temperature, the oil return time of the air conditioner is adjusted from the second set oil return time to the first set oil return time. The first set oil return time is less than the second set oil return time, so that the oil can be returned quickly, avoiding the low pressure problem caused by long-term oil return when the system has no low-temperature components. For example, the second set oil return time is 3 minutes, and the first set oil return time is 1 minute.

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

[0085] The compressor of the air conditioner is controlled to stop running.

[0086] Wherein, the air conditioner enters the shutdown state mainly to control the compressor to stop running, to avoid the low pressure from getting lower. In one embodiment, after the outdoor unit stops running, the indoor unit can also continue to ventilate.

[0087] In the embodiment of the present application, when the outdoor unit of the air conditioner is in an extremely cold environment and meets the temperature-reaching shutdown condition, it detects whether the oil return condition is currently met, and shuts down after the oil return is completed, which can avoid damage caused by dry friction of the compressor when the air conditioner is turned on next time, and ensure the oil return effect of the unit. In addition, when the return air temperature is lower than the second set value, the air conditioner is controlled to shut down, which can avoid further reduction of system pressure, avoid low pressure protection, and avoid customer troubles caused by frequent alarms.

[0088] In order to implement the method of the embodiment of the present application, the embodiment of the present application also provides 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 above-mentioned air-conditioning control method under ultra-low temperature and ultra-low load conditions, and each step in the embodiment of the above-mentioned air-conditioning control method under ultra-low temperature and ultra-low load conditions is also fully applicable to the embodiment of the air-conditioning control device under ultra-low temperature and ultra-low load conditions.

[0089] The device includes:

[0090] A first determination module, used to determine whether the return air temperature of the indoor unit is lower than a second set value when the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature;

[0091] a second determination module, configured to determine whether the air conditioner satisfies an oil return condition if the return air temperature of the indoor unit is lower than the second set value;

[0092] A first control module, configured to control the air conditioner to return oil if the air conditioner meets an oil return condition;

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

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

[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 condition.

[0096] In one embodiment, the second determining module is specifically configured to:

[0097] When the operation 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.

[0098] In one embodiment, the air conditioner outdoor unit includes a low temperature component, the low temperature component includes a liquid storage tank and a flow regulating device, the flow regulating device is used to regulate the inlet and outlet flow of the refrigerant in the liquid storage tank; the device also includes:

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

[0100] In one embodiment, the air conditioner outdoor unit includes an electric heating belt, and the electric heating belt is used to heat the low-temperature component. The device also includes:

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

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

[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, and the first set oil return duration is shorter than the second set oil return duration.

[0104] In one embodiment, the second control module is specifically configured to:

[0105] The compressor of the air conditioner is controlled to stop running.

[0106] In actual application, the first determination module, the second determination module, the first control module and the second control module can be implemented by a processor in the air conditioning device. Of course, the processor needs to run the computer program in the memory to implement its function.

[0107] It should be noted that: the air conditioning control device under ultra-low temperature and ultra-low load state provided in the above embodiment only uses the division of the above program modules as an example when performing air conditioning control and module training under ultra-low temperature and ultra-low load state. In actual application, 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 state provided in the above embodiment belongs to the same concept as the air conditioning control method embodiment under ultra-low temperature and ultra-low load state. The specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0108] Based on the hardware implementation of the above-mentioned program modules, and in order to implement the method of the embodiment of the present application, the embodiment of the present application also provides an air-conditioning device. Figure 3 Schematic diagram of the hardware structure of the air-conditioning device in the embodiment of the present application. Figure 3 As shown, the air conditioning device comprises:

[0109] Communication interface, which can exchange information with other devices such as network equipment;

[0110] The processor is connected to the communication interface to realize information exchange with other devices, and is used to execute the method provided by one or more technical solutions when running the computer program. The computer program is stored in the memory.

[0111] Of course, in actual application, the various components in the air conditioning equipment are coupled together through the bus system. It can be understood that the bus system is used to realize the connection and communication between these components. In addition to the data bus, the bus system also includes a power bus, a control bus and a status signal bus. However, for the sake of clarity, Figure 3 In the specification, various buses are labeled as bus systems.

[0112] An embodiment of the present application also provides a data center, which includes a cabinet and the above-mentioned air-conditioning equipment.

[0113] The memory in the embodiment of the present application 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 the air conditioning device.

[0114] In one embodiment, 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 of the flow regulating device and extend the adjustment time of the flow regulating device when the air-conditioning is in cooling mode or dehumidification mode.

[0115] In one embodiment, the air conditioner outdoor unit 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.

[0116] It can be understood that the memory can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disk, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a 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), synchronous link dynamic random access memory (SLDRAM), direct memory bus random access memory (DRRAM). The memory described in the embodiments of the present application is intended to include but is not limited to these and any other suitable types of memory.

[0117] The method disclosed in the above embodiment of the present application can be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor may be a general-purpose processor, a DSP, or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiment of the present application, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in a memory, and the processor reads the program in the memory and completes the steps of the above method in combination with its hardware.

[0118] Optionally, when the processor executes the program, the corresponding processes implemented by the computer device in each method of the embodiments of the present application are implemented, which will not be described in detail here for the sake of brevity.

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

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

[0121] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0122] In addition, all functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may be a separate unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0123] A person of ordinary skill in the art can understand that: all or part of the steps of implementing the above-mentioned method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium, which, when executed, executes the steps of the above-mentioned method embodiment; and the aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, disks or optical disks.

[0124] Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the embodiment of the present application can be essentially or partly embodied in the form of a software product that contributes to the relevant technology. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

[0125] In an exemplary embodiment, the embodiment of the present application also provides a computer program product, including a computer program, which 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 the embodiment of the present application.

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

[0127] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0128] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An air conditioning control method under ultra-low temperature and ultra-low load conditions, characterized in that: The method comprises: When the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature, determining whether the return air temperature of the indoor unit is lower than the 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; If the air conditioner meets the oil return condition, controlling the air conditioner to return oil; After the oil return is completed, the air conditioner is controlled to enter a shutdown state.

2. The method according to claim 1, characterized in that: After determining whether the air conditioner meets the oil return condition, the method further includes: If the air conditioner does not meet the oil return condition, the air conditioner is controlled to enter a shutdown state.

3. The method according to claim 1, characterized in that: The determining whether the air conditioner meets the oil return condition includes: When the operation 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.

4. The method according to claim 1, characterized in that: The air conditioner outdoor unit includes a low-temperature component, the low-temperature component includes a liquid storage tank and a flow regulating device, and the flow regulating device is used to regulate the inlet and outlet flow of the refrigerant in the liquid storage tank; The method further comprises: When the air conditioner is in cooling mode or dehumidification mode, the opening of the flow regulating device is gradually reduced, and the regulating time of the flow regulating device is prolonged.

5. The method according to claim 4, characterized in that: The air conditioner outdoor unit includes an electric heating belt, and the electric heating belt is used to heat the low-temperature component. The method also includes: Determining the pressure value in the liquid storage tank; When the pressure value is less than a threshold value, the electric heating belt is controlled to start heating.

6. The method according to claim 1, characterized in that: When the ambient temperature of the air conditioner outdoor unit is lower than the first set temperature, the method further includes: The oil return duration of 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 shorter than the second set oil return duration.

7. An air conditioning control device under ultra-low temperature and ultra-low load conditions, characterized in that: include: A first determination module, used to determine whether the return air temperature of the indoor unit is lower than a second set value when the ambient temperature of the outdoor unit of the air conditioner is lower than the first set temperature; a second determination module, configured to determine whether the air conditioner satisfies an oil return condition if the return air temperature of the indoor unit is lower than the second set value; A first control module, configured to control the air conditioner to return oil if the air conditioner meets an oil return condition; The second control module is used to control the air conditioner to enter a shutdown state after completing the oil return.

8. An air conditioning device, characterized in that: include: A processor and a memory for storing a computer program that can be run on the processor, wherein the processor, when running the computer program, executes the steps of the method according to any one of claims 1 to 6.

9. The air conditioning device according to claim 8, characterized in that: The air conditioning equipment also 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 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.

10. A data center, characterized in that: It comprises a data center cabinet and the air conditioning equipment according to any one of claims 8 to 9.

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