Method and device for judging the diameter of an oil return hole, and gas-liquid separator

Abstract

The present application relates to the technical field of intelligent air conditioners, and discloses a method for judging the diameter of an oil return hole, which is applied to a gas-liquid separator of an air-conditioning refrigeration system; the method includes: when the air conditioner operates under preset conditions and the compressor is in a non-oil return stage, obtaining the exhaust temperature of the compressor and the oil temperature of the compressed oil; determining the qualification of the diameter of the oil return hole according to the exhaust temperature and the oil temperature of the compressed oil. This method can determine the qualification of the diameter of the oil return hole through the exhaust temperature and the oil temperature of the compressed oil. In this way, it is possible to prevent air conditioners with unqualified oil return hole diameters from entering the market and eliminate potential safety hazards of the air conditioners. The present application also discloses a device, a gas-liquid separator and a storage medium for judging the diameter of the oil return hole.

Description

Technical Field

[0001] This application relates to the technical field of intelligent air conditioners, for example, to a method, device, gas-liquid separator, and storage medium for determining the diameter of an oil return hole. Background Art

[0002] As the core power component of an air conditioning system, the size of the oil return hole diameter of the gas-liquid separator is crucial for the compressor. An overly large or small oil return hole diameter will both lead to insufficient oil return to the compressor, thereby causing compressor wear and even potential safety hazards. In existing air conditioning control systems, there is no obvious warning regarding wear caused by insufficient oil or diluted oil in the compressor, resulting in problems such as increased compressor load, cylinder jamming, and carbonization of compressor oil.

[0003] The related art discloses a detection method for the oil return hole of a gas-liquid separator, which is applied to the technical field of air conditioners and includes: injecting refrigeration oil into the gas-liquid separator to be tested, where the refrigeration oil covers the oil return hole of the gas-liquid separator to be tested, using the outlet pipe of the gas-liquid separator to be tested to extract the refrigeration oil inside the gas-liquid separator to be tested, detecting the flow rate of the refrigeration oil when it flows through the outlet pipe of the gas-liquid separator to be tested, and based on the flow rate of the refrigeration oil extracted from the outlet pipe of the gas-liquid separator to be tested and a pre-measured standard flow rate, determining whether the oil return hole of the gas-liquid separator to be tested is blocked, where the standard flow rate is the flow rate of the refrigeration oil extracted from the outlet pipe of the gas-liquid separator to be tested when the oil return hole of the gas-liquid separator to be tested is not blocked.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] The related art only detects the blockage condition of the oil return hole and cannot determine whether the diameter of the oil return hole is appropriate before the air conditioner leaves the factory, resulting in potential safety hazards for the air conditioner.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] The embodiments of the present disclosure provide a method, device, gas-liquid separator, and storage medium for determining the diameter of an oil return hole to determine whether the diameter of the oil return hole meets the oil return requirements of the compressor, thereby eliminating potential safety hazards of the air conditioner.

[0009] In some embodiments, the method includes: when the compressor operates under preset conditions, obtaining the exhaust temperature and the compressor oil temperature of the compressor; and determining the qualification status of the oil return hole diameter according to the exhaust temperature and the compressor oil temperature.

[0010] In some embodiments, the apparatus includes: a processor and a memory storing program instructions, where the processor is configured to execute the method for determining the oil return hole diameter as described above when running the program instructions.

[0011] In some embodiments, the gas-liquid separator includes: a gas-liquid separator body; and the apparatus for determining the oil return hole diameter as described above, which is installed on the gas-liquid separator body.

[0012] In some embodiments, the storage medium stores program instructions, and the program instructions execute the method for determining the oil return hole diameter as described above when running.

[0013] The method, apparatus, gas-liquid separator, and storage medium for determining the oil return hole diameter provided by the embodiments of the present disclosure can achieve the following technical effects:

[0014] In the embodiments of the present disclosure, the compressor is controlled to operate under preset conditions, and when the compressor is in the non-oil return stage, the exhaust temperature and the compressor oil temperature of the compressor are detected to determine whether the diameter of the oil return hole of the gas-liquid separator is appropriate. Since the oil quantity of the compressor will be abnormal due to an inappropriate oil return hole diameter, the exhaust temperature and the oil temperature of the compressor will be abnormal. Therefore, the qualification status of the oil return hole diameter can be determined through the exhaust temperature and the compressor oil temperature. In this way, air conditioners with unqualified oil return hole diameters can be prevented from entering the market, eliminating potential safety hazards of the air conditioners.

[0015] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0017] Figure 1 is a schematic structural diagram of a gas-liquid separator provided by an embodiment of the present disclosure;

[0018] Figure 2 is a schematic diagram of a method for determining the oil return hole diameter provided by an embodiment of the present disclosure;

[0019] Figure 3It is a schematic diagram of another method provided by an embodiment of the present disclosure for judging the diameter of the oil return hole;

[0020] Figure 4 It is a schematic diagram of another method provided by an embodiment of the present disclosure for judging the diameter of the oil return hole;

[0021] Figure 5 It is a schematic diagram of a device provided by an embodiment of the present disclosure for judging the diameter of the oil return hole;

[0022] Figure 6 It is a schematic structural diagram of another gas-liquid separator provided by an embodiment of the present disclosure.

[0023] Reference signs:

[0024] 20: gas outlet pipe; 30: gas inlet pipe; 40: oil return hole; H: height of the oil return hole. Detailed implementation manners

[0025] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and illustration purposes and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0026] In the specification, claims and above-mentioned drawings of the embodiments of the present disclosure, terms such as "first", "second", etc. are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0027] Unless otherwise specified, the term "plurality" means two or more.

[0028] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0029] The term "and / or" is a description of the association relationship of an object and indicates that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0030] The term "corresponding" can refer to an association relationship or a binding relationship. A corresponding to B means that there is an association relationship or a binding relationship between A and B.

[0031] Combination Figure 1 The gas-liquid separator separates the refrigerant flowing back from the evaporator to the compressor into gaseous refrigerant and liquid refrigerant, and only allows the gaseous refrigerant to return to the compressor. At the same time, oil will dissolve in the separated liquid refrigerant, so it is necessary to return the oil to the compressor to ensure the oil volume in the compressor, thereby supplying oil to the scroll part of the compressor. The gas-liquid separator includes an outlet pipe 20 and an inlet pipe 30. Among them, the outlet pipe 20 is a U-shaped pipeline, and an oil return hole 40 is provided at the lowest end of the outlet pipe 20. The liquid refrigerant with dissolved oil returns to the compressor through the oil return hole 40.

[0032] If the oil return hole is large, the oil return to the compressor increases, but the amount of liquid refrigerant flowing into the compressor will also increase. This causes the oil to be diluted (the lubricating effect of the oil is reduced), and the scroll part of the compressor will experience abnormal wear, and the compressor may malfunction. If the oil return hole is small, the amount of liquid refrigerant flowing back to the compressor will decrease, and at the same time the oil return will also decrease. This causes insufficient oil supply to the compressor, resulting in abnormal wear, and thus the compressor malfunctions. Therefore, the diameter of the oil return hole needs to ensure that the oil volume in the compressor is within a reasonable range.

[0033] In order to avoid potential safety hazards in the air conditioner, the embodiments of the present disclosure determine whether the diameter of the oil return hole is appropriate before the air conditioner leaves the factory. Combination Figure 1 As shown, the embodiments of the present disclosure provide a method for determining the diameter of the oil return hole, including:

[0034] S101, when the air conditioner operates under preset conditions and the compressor is in a non-oil-return stage, the processor obtains the exhaust temperature and the oil temperature of the compressor oil;

[0035] S102, the processor determines the qualified situation of the diameter of the oil return hole according to the exhaust temperature and the oil temperature of the compressor oil.

[0036] Here, in order to determine whether the diameter of the oil return hole of the designed gas-liquid separator is qualified, the gas-liquid separator is installed in the air-conditioning refrigeration system. The air conditioner is controlled to operate under preset conditions, and the preset conditions refer to that the air conditioner operates at the maximum load for a certain period of time. When the air conditioner operates at the maximum load, the amount of oil required by the compressor is the largest. In this case, if the oil return amount meets the requirements of the compressor, it can be determined that the diameter of the oil return hole of the gas-liquid separator is appropriate. Specifically, when the compressor is in the non-oil-return stage, the exhaust temperature and the oil temperature of the compressor are detected by a temperature sensor. If the exhaust temperature of the compressor and the oil temperature of the compressor meet the requirements, it indicates that the diameter of the oil return hole is qualified. If the exhaust temperature and the oil temperature of the compressor do not meet the requirements, it indicates that the oil return of the compressor is abnormal, resulting in abnormal operating parameters of the compressor. At this time, it is determined that the diameter of the oil return hole is unqualified.

[0037] In addition, the oil return stage refers to the process of recovering the oil in the indoor unit and the refrigerant pipeline to the compressor. When the compressor returns oil, the compressor is controlled to increase its frequency, and the opening degrees of the electronic expansion valve of the indoor unit and the solenoid valve of the outdoor unit are adjusted to the maximum, so that the oil can be quickly recovered to the gas-liquid separator. Therefore, when the compressor is in the oil return stage, the amount of oil in the gas-liquid separator gradually increases and reaches the maximum value as the oil return stage is completed. During the oil return stage, since the oil is recovered to the gas-liquid separator, it is impossible to accurately judge whether the oil supply of the gas-liquid separator to the compressor meets the requirements of the compressor. Therefore, during the non-oil return stage, the exhaust temperature and the oil temperature of the compressor are judged. The non-oil return stage refers to the stage other than the oil return stage.

[0038] By using the method for judging the oil return hole diameter provided in the embodiments of the present disclosure, the compressor is controlled to operate under preset conditions, and when the compressor is in the non-oil return stage, the exhaust temperature and the oil temperature of the compressor are detected to judge whether the diameter of the oil return hole of the gas-liquid separator is appropriate. If the diameter of the oil return hole is not appropriate, the amount of oil in the compressor will be abnormal, resulting in abnormal exhaust temperature and oil temperature of the compressor. Therefore, the qualified condition of the oil return hole diameter can be determined through the exhaust temperature and the oil temperature of the compressor. In this way, air conditioners with unqualified oil return hole diameters can be prevented from entering the market, eliminating potential safety hazards of the air conditioners.

[0039] Optionally, in step S101, the air conditioner operating under preset conditions includes:

[0040] When the processor controls the air conditioner to operate in the cooling mode, and controls the compressor to operate at the highest frequency for a first duration, the indoor unit of the air conditioner operates with the maximum cooling capacity.

[0041] Here, the air conditioner operating in the cooling mode helps the oil in the refrigerant circulation circuit to circulate back to the compressor. After the air conditioner is shut down, the oil in the refrigerant circulation circuit is recovered to the indoor side, that is, the indoor unit. If the air conditioner operates in the heating mode after being turned on, a large amount of oil still remains in the indoor unit condenser. After the condenser exchanges heat, the gaseous refrigerant becomes a liquid refrigerant, and a large amount of oil is stored in the liquid refrigerant. The gas-liquid separator sends the gaseous refrigerant to the compressor, and at the same time, the oil is sent to the compressor along with the gaseous refrigerant. At this time, the amount of oil flowing back to the compressor is small, and the oil in the liquid refrigerant needs to be sent back to the compressor through the oil return hole. In this case, the demand for the amount of oil in the compressor is large. Therefore, it is impossible to accurately judge whether the diameter of the oil return hole is qualified. However, in the cooling mode, the indoor unit is an evaporator, and the refrigerant in the indoor unit changes from a liquid state to a gaseous state. That is, a large amount of oil in the indoor unit flows back to the compressor through the gas-liquid separator along with the gaseous refrigerant. In this case, the size of the oil return hole diameter has a crucial impact on the oil return of the compressor. That is, the oil supply demand of the compressor for the oil return port is relatively normal, so it is helpful to judge whether the diameter of the oil return hole is qualified at this time.

[0042] Meanwhile, control the compressor to operate at the highest frequency and the indoor unit to operate at the maximum cooling capacity. At this time, the amount of oil required by the compressor is the largest, and the demand for oil supply is the most stringent. If the diameter of the oil return hole can meet the oil return requirement of the compressor under such circumstances, then the diameter of the oil return hole must be qualified.

[0043] Optionally, the processor controls the air conditioner indoor unit to operate at the maximum cooling capacity, including:

[0044] In the case where there are multiple indoor units of the air conditioner, the processor controls all indoor units to operate; and, controls each indoor unit to operate at the highest wind speed and the lowest temperature.

[0045] In the embodiments of the present disclosure, the compressor is a scroll compressor, which is mainly applied to a multi-connected air conditioner. Therefore, in the multi-connected air conditioner scenario, controlling the indoor unit to operate at the maximum cooling capacity includes controlling all indoor units to operate. And controls the indoor unit to operate at the highest rotational speed and the lowest temperature. The lowest temperature refers to the lowest temperature allowed for the indoor unit under the test environment, such as 16 °C. In this way, it helps to recover the amount of oil in the refrigerant circulation circuit and avoid most of the oil being stored in the refrigerant circulation circuit. In addition, in some embodiments, controlling the indoor unit to operate at the maximum cooling capacity includes operating more than a certain proportion of indoor units, such as operating more than 50% of indoor units.

[0046] Optionally, the processor determines the first duration in the following manner:

[0047] The processor determines the oil return period corresponding to the current cooling load according to the correspondence between the cooling load and the oil return period, and uses this oil return period as the first duration.

[0048] Taking a multi-connected air conditioner as an example, it has multiple indoor units, such as 4 units. If all the indoor units are turned on for cooling, the cooling load is 100%. If three indoor units are turned on for cooling, the cooling load is 75%, and so on. The greater the cooling load, the longer the oil return period. The corresponding relationship can be seen in Table 1.

[0049] Table 1 Corresponding relationship table of load and oil return period

[0050] Load Oil return cycle (hours / h) 100％ A1 75％ A2 50％ A3 25％ A4

[0051] Among them, A1 is greater than A2, A2 is greater than A3, and A3 is greater than A4. Optionally, A1 = 2A2, A2 = 2A3, and A3 = 2A4.

[0052] In this way, after the compressor is started up to the first duration of operation (i.e., before the compressor returns oil), the exhaust temperature of the compressor and the oil temperature of the compressor are detected in real time to judge the qualification of the diameter of the oil return hole.

[0053] Optionally, the compressor is a low-pressure chamber compressor; S102, the processor determines the qualification of the oil return hole diameter according to the exhaust temperature and the compressor oil temperature, including:

[0054] When the exhaust temperature is greater than or equal to the first exhaust temperature and less than or equal to the second exhaust temperature, and the compressor oil temperature is greater than or equal to the current suction saturation temperature and less than or equal to the compressor oil temperature limit value, the processor determines that the diameter of the oil return hole is qualified.

[0055] The working principle of the low-pressure chamber compressor is to directly send the sucked low-temperature and low-pressure gaseous refrigerant into the closed cavity below the scroll disk, and then compress it into high-temperature and high-pressure refrigerant through the scroll disk. The high-temperature and high-pressure refrigerant is directly discharged from the exhaust pipe above the scroll disk. During this process, the entire compressor shell is at a low temperature, and the shell cavity (except the exhaust port and the exhaust cavity) is at a low pressure. In addition, the refrigerant and oil of the low-pressure chamber compressor are separated; it uses an oil pump for forced oil supply. Therefore, it can supply oil to the lubrication part quickly in time after startup, without being affected by the pressure difference. This oil supply method separates the oil from the high-temperature and high-pressure gaseous refrigerant, so the oil temperature is much lower than the exhaust temperature and higher than the suction temperature.

[0056] Therefore, here it is judged whether the compressor oil temperature is greater than the current suction saturation temperature and less than or equal to the oil temperature limit value. The current suction saturation temperature is determined by detecting the current suction pressure and according to the corresponding relationship between the suction pressure and the saturation temperature to determine the current saturation temperature corresponding to the current suction pressure. The oil temperature limit value refers to the limit temperature that the low-pressure chamber compressor can withstand. At the same time, it is also necessary to judge whether the exhaust temperature of the compressor meets the corresponding conditions. Among them, the exhaust temperature is the real-time exhaust temperature, and the oil temperature is the real-time oil temperature. Specifically, the first exhaust temperature is increased by the first temperature on the basis of the saturation temperature corresponding to the real-time exhaust temperature. For example, if the real-time exhaust saturation temperature is Pd-t s , and the first temperature is ΔT1, then the first exhaust temperature Pd-t1 = Pd-t s +ΔT1. Among them, the value range of ΔT is 30°C - 40°C, such as 35°C. The second exhaust temperature Pd-t2 is subtracted by the second temperature ΔT2 on the basis of the highest exhaust temperature Pd-t h allowed by the compressor, that is, Pd-t2 = Pd-t h -ΔT2. Among them, the value range of ΔT is 15°C - 25°C, such as 20°C. When the exhaust temperature and the oil temperature simultaneously meet the above conditions, it is determined that the diameter of the oil return hole is qualified.

[0057] Optionally, the compressor is a high-pressure chamber compressor; S102, the processor determines the qualification of the oil return hole diameter according to the exhaust temperature and the compressor oil temperature, including:

[0058] When both the exhaust gas temperature and the compressor oil temperature meet the condition of being greater than or equal to the third exhaust gas temperature and less than or equal to the fourth exhaust gas temperature, the processor determines that the oil return hole diameter is qualified.

[0059] The working principle of the high-pressure chamber compressor is to directly send the sucked low-temperature and low-pressure gaseous refrigerant into the scroll disk for compression. The high-temperature and high-pressure refrigerant enters the closed cavity below the scroll disk and then is discharged from the exhaust port. During this process, the entire compressor housing is at a high temperature, and the inside of the housing cavity (except for the suction port and the suction cavity) is at a high pressure. The high-pressure chamber compressor relies on the pressure difference between the high and low pressures inside the compressor to supply oil to the bearings and the scroll disk. In this oil supply method, the oil and the refrigerant do not separate, making the oil temperature approximately equal to the exhaust gas temperature. Therefore, the oil temperature is also judged by the exhaust gas temperature parameter, that is, the judgment conditions for the oil temperature and the exhaust gas temperature are the same. As the judgment parameters of the low-pressure chamber compressor mentioned above, the third exhaust gas temperature is increased by the third temperature on the basis of the saturation temperature corresponding to the real-time exhaust gas temperature of the high-pressure chamber compressor. If the real-time exhaust gas saturation temperature is Pd - t’ s , and the third temperature is ΔT3, then the third exhaust gas temperature Pd - t3 = Pd - t’ s +ΔT3. Among them, the value range of ΔT3 is 30°C - 40°C. The second exhaust gas temperature Pd - t2 is subtracted by the fourth temperature ΔT4 on the basis of the highest allowable exhaust gas temperature Pd - t’ h of the high-pressure chamber compressor, that is, Pd - t4 = Pd - t’ h -ΔT4. Among them, the value range of ΔT is 15°C - 25°C. When both the exhaust gas temperature and the oil temperature meet the above conditions, it is determined that the oil return hole diameter is qualified. In addition, the value of the first temperature can be the same as the value of the third temperature, and the value of the second temperature can be the same as the value of the fourth temperature.

[0060] Combined Figure 3 as shown, the embodiments of the present disclosure provide another method for judging the oil return hole diameter, including:

[0061] S101, when the air conditioner operates under preset conditions and the compressor is in the non-oil return stage, the processor obtains the exhaust gas temperature and the compressor oil temperature of the compressor.

[0062] S102, the processor determines the qualified situation of the oil return hole diameter according to the exhaust gas temperature and the compressor oil temperature.

[0063] S203, when it is determined that the oil return hole diameter is unqualified and the compressor has completed the oil return stage, the processor obtains the oil level height of the gas-liquid separator.

[0064] S204, when the oil level height of the gas-liquid separator is higher than the oil return hole height and lasts for the second time length, the processor determines that the oil return hole diameter is too small.

[0065] In an embodiment of the present disclosure, after determining that the diameter of the oil return hole is unqualified, the air conditioner is controlled to continue operating with the current operating parameters, so that the operating duration of the compressor is greater than the first duration. Thereby, the compressor enters the oil return stage and completes oil return, that is, the oil in the indoor unit and the pipeline is recovered to the compressor. At this time, the oil volume in the compressor is the largest. The oil level height of the gas-liquid separator is detected in real time, and it is judged whether the oil level height is higher than the height of the oil return hole. The height H of the oil return hole refers to the height of the center position of the oil return hole from the lowest end of the gas-liquid separator. For details, see Figure 1 . After the compressor completes oil return, when the diameter of the oil return hole of the gas-liquid separator is qualified, the oil of the gas-liquid separator is sucked into the compressor. This makes the oil level of the gas-liquid separator should be lower than or equal to the height of the oil return hole. Therefore, if the oil level height of the gas-liquid separator continuously exceeds the height of the oil return hole within the second duration, it indicates that the diameter of the oil return hole of the gas-liquid separator is too small. Wherein, the second duration is set to 10-15 minutes. In addition, the qualified diameter of the oil return hole means that the diameter of the oil return hole is within a preset range. The too small diameter of the oil return hole means that the diameter of the oil return hole is smaller than the minimum value of the preset range. Similarly, the too large diameter of the oil return hole means that the diameter of the oil return hole is larger than the maximum value of the preset range.

[0066] Combined with Figure 4 As shown, the embodiment of the present disclosure provides another method for judging the diameter of the oil return hole, including:

[0067] S101. When the air conditioner operates under preset conditions and the compressor is in a non-oil return stage, the processor obtains the exhaust temperature and the oil temperature of the compressor oil.

[0068] S102. The processor determines the qualified condition of the diameter of the oil return hole according to the exhaust temperature and the oil temperature of the compressor oil.

[0069] S303. When it is determined that the diameter of the oil return hole is unqualified and the compressor has completed the oil return stage, the processor obtains the oil level position of the compressor.

[0070] S304. When the oil level position of the compressor is lower than the lowest safe oil level position, the processor determines the unqualified condition of the diameter of the oil return hole according to the current exhaust temperature or the current oil level height of the gas-liquid separator.

[0071] In the disclosed embodiment, after determining that the caliber of the oil return hole is unqualified, the air conditioner is controlled to maintain the current operating parameters and continue to operate, so that the operating time of the compressor is greater than the first time. The compressor thus enters the oil return stage and completes the oil return, that is, the oil in the indoor unit and the pipeline is recovered to the compressor. At this time, the amount of oil in the compressor is the largest. The oil level of the compressor is detected in real time. When the caliber of the oil return hole of the gas-liquid separator is qualified, the oil level position of the compressor should be higher than or equal to the minimum safe oil level position. The minimum safe oil level position refers to the position of the minimum amount of oil that does not cause wear to the compressor. Therefore, when the oil level position of the compressor is lower than the minimum safe oil level position, it is judged that the caliber of the oil return hole is unqualified. Further, the current exhaust temperature of the compressor or the current oil level of the gas-liquid separator is used to judge whether the caliber of the oil return hole is too large or too small.

[0072] Optionally, in step S304, the processor determines the unqualified condition of the oil return aperture according to the current exhaust temperature or the current oil level of the gas-liquid separator, including:

[0073] When the current exhaust temperature is lower than the fifth exhaust temperature, the processor determines that the diameter of the oil return hole is too large; or, when the current oil level of the gas-liquid separator is higher than the height of the oil return hole and lasts for a third period of time, the processor determines that the diameter of the oil return hole is too small.

[0074] Here, the current exhaust temperature after the compressor returns oil is detected. If the current exhaust temperature is less than the fifth exhaust temperature, it indicates that the diameter of the oil return hole is too large. The fifth exhaust temperature Pd-t5 refers to the saturation temperature Pd-t5 corresponding to the current exhaust. s "On the basis of increasing the first temperature, that is, Pd-t5 = Pd-t s "+ΔT1. Because the diameter of the oil return hole is too large, more liquid refrigerant flows into the compressor. As a result, the exhaust temperature of the compressor is reduced. Therefore, when the current exhaust temperature of the compressor is low, it is determined that the diameter of the oil return hole of the gas-liquid separator is too large. In addition, it can also be determined whether the current oil level of the gas-liquid separator is higher than the oil return hole height for a third time period. If so, it is determined whether the diameter of the oil return hole is too small. In this way, it can not only be determined whether the diameter of the oil return hole is qualified, but also whether the unqualified is caused by the hole diameter being too large or too small.

[0075] The embodiment of the present disclosure provides a device for judging the diameter of an oil return hole, comprising an acquisition module and a determination module. The acquisition module is configured to acquire the exhaust temperature and the oil temperature of the compressor when the air conditioner is running under preset conditions and the compressor is in a non-oil return stage. The determination module is configured to determine the qualification of the diameter of the oil return hole according to the exhaust temperature and the oil temperature of the compressor.

[0076] By using the device for judging the oil return hole diameter provided by the embodiments of the present disclosure, the compressor is controlled to operate under preset conditions, and when the compressor is in the non-oil return stage, the exhaust temperature and the oil temperature of the compressor are detected. To judge whether the diameter of the oil return hole of the gas-liquid separator is appropriate. Because the diameter of the oil return hole is inappropriate, the oil quantity of the compressor will be abnormal, resulting in abnormal exhaust temperature and oil temperature of the compressor. Therefore, the qualified condition of the oil return hole diameter can be determined by the exhaust temperature and the oil temperature of the compressor. In this way, air conditioners with unqualified oil return hole diameters can be avoided from entering the market, eliminating potential safety hazards of the air conditioners.

[0077] Combined with Figure 5 As shown, the embodiments of the present disclosure provide a device 200 for judging the oil return hole diameter, including a processor 100 and a memory 101. Optionally, the device may further include a communication interface 102 and a bus 103. Among them, the processor 100, the communication interface 102, and the memory 101 can communicate with each other through the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call the logical instructions in the memory 101 to execute the method for judging the oil return hole diameter in the above embodiments.

[0078] In addition, when the logical instructions in the above-mentioned memory 101 are implemented in the form of software function units and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0079] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, implements the method for judging the oil return hole diameter in the above embodiments.

[0080] The memory 101 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 101 may include a high-speed random access memory and may also include a non-volatile memory.

[0081] Combined with Figure 6As shown in the figure, an embodiment of the present disclosure provides a gas-liquid separator 300, including: a gas-liquid separator body, and the above-described device 200 for judging the diameter of the oil return hole. The device 200 for judging the diameter of the oil return hole is installed on the gas-liquid separator body. The installation relationship described here is not limited to being placed inside the product, but also includes the installation connection with other components of the product, including but not limited to physical connection, electrical connection, or signal transmission connection, etc. Those skilled in the art can understand that the device 200 for judging the diameter of the oil return hole can be adapted to a feasible product body, thereby implementing other feasible embodiments.

[0082] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are set to execute the above method for judging the diameter of the oil return hole.

[0083] The above computer-readable storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0084] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The foregoing storage medium may be a non-transient storage medium, including: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, or may also be a transient storage medium.

[0085] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments only represent possible variations. Unless explicitly required, the individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing the embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, or device comprising the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0086] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The technician can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The technician can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0087] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the shown or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0088] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the block can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for determining the diameter of the oil return hole, which is applied to the gas-liquid separator of an air-conditioning refrigeration system; characterized in that, The method includes: When the air conditioner operates under preset conditions and the compressor is in the non-oil-return stage, obtaining the exhaust temperature and the compressor oil temperature; wherein, the preset conditions are that the air conditioner operates at maximum load for a first duration. Determining the qualification of the oil return hole diameter according to the exhaust temperature and the compressor oil temperature; wherein, if the compressor is a low-pressure chamber compressor, when the exhaust temperature is greater than or equal to the first exhaust temperature and less than or equal to the second exhaust temperature, and the compressor oil temperature is greater than or equal to the current suction saturation temperature and less than or equal to the compressor oil temperature limit value, it is determined that the oil return hole diameter is qualified; if the compressor is a high-pressure chamber compressor, when both the exhaust temperature and the compressor oil temperature satisfy being greater than or equal to the third exhaust temperature and less than or equal to the fourth exhaust temperature, it is determined that the oil return hole diameter is qualified.

2. The method according to claim 1, wherein The air conditioner operating at maximum load for a first duration includes: When the air conditioner operates in the cooling mode, controlling the compressor to operate at the highest frequency for a first duration; and controlling the indoor unit of the air conditioner to operate with the maximum cooling capacity.

3. The method according to claim 2, characterized in that, The controlling the indoor unit of the air conditioner to operate with the maximum cooling capacity includes: When there are multiple indoor units of the air conditioner, controlling all indoor units to operate; and controlling each indoor unit to operate at the highest wind speed and the lowest temperature.

4. The method according to claim 1, characterized in that Determine the first duration in the following way: According to the corresponding relationship between the refrigeration load and the oil return cycle, determine the oil return cycle corresponding to the current refrigeration load, and use the oil return cycle as the first duration.

5. The method according to any one of claims 1 to 4, characterized in that, When it is determined that the oil return hole diameter is unqualified, the method further includes: When the compressor completes oil return, obtaining the oil level height of the gas-liquid separator. When the oil level height of the gas-liquid separator is higher than the oil return hole height and lasts for a second duration, it is determined that the oil return hole diameter is too small.

6. The method according to any one of claims 1 to 4, characterized in that When it is determined that the oil return hole diameter is unqualified, the method further includes: When the compressor completes oil return, obtaining the oil level position of the compressor. When the oil level position of the compressor is lower than the lowest safe oil level position, determine the unqualified situation of the oil return hole diameter according to the current exhaust temperature or the current oil level height of the gas-liquid separator.

7. The method according to claim 6, wherein Determining the unqualified situation of the oil return hole diameter according to the current exhaust temperature or the current oil level height of the gas-liquid separator includes: When the current exhaust temperature is less than the fifth exhaust temperature, it is determined that the oil return hole diameter is too large; or, When the current oil level height of the gas-liquid separator is higher than the oil return hole height and lasts for a third duration, it is determined that the oil return hole diameter is too small.

8. A device for judging the diameter of an oil return hole, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the method for judging the oil return hole diameter according to any one of claims 1 to 7 when running the program instructions.

9. A gas-liquid separator, characterized in that, Includes: The gas-liquid separator body; The device for judging the oil return hole diameter according to claim 8, which is installed on the gas-liquid separator body.

10. A storage medium stores program instructions, characterized in that, When the program instructions are running, execute the method for judging the oil return hole diameter according to any one of claims 1 to 7.

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