Oil separation assembly, multi-split air conditioning system and control method

Abstract

The invention relates to the technical field of air conditioners, and provides an oil separation assembly, a multi-split air conditioner system and a control method.The oil separation assembly comprises an oil separator, an oil storage tank and a pipeline component, and an inlet of the oil storage tank is connected to an oil outlet of the oil separator through a first control valve; the pipeline component comprises an oil storage pipeline and an oil discharge pipeline which are communicated with the inner cavity of the oil storage tank, an inlet of the oil storage pipeline is higher than an inlet of the oil discharge pipeline, an outlet of the oil storage pipeline and an outlet of the oil discharge pipeline are used for being connected with an air suction port of the compressor, the oil storage pipeline is provided with a second control valve, and the oil discharge pipeline is provided with a third control valve. When the compressor oil returning to the compressor is too much, the first control valve and the second control valve are controlled to be opened, so that the compressor oil in the oil separator is accumulated in the oil storage tank, the compressor oil returning to the compressor is reduced, the operation energy efficiency of the air conditioner is improved on the premise of ensuring that the compressor is fully lubricated, and the defect that the energy efficiency is reduced in the prior art is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an oil separation component, a multi-connected unit system and a control method. Background Art

[0002] The installation conditions of multi-connected unit systems are complex and diverse, and the corresponding operating conditions vary widely. There are installation situations such as long refrigerant pipes, high elevation differences, multiple indoor units, and multiple outdoor units in parallel in the indoor and outdoor unit systems; the indoor unit start-up rate ranges from only starting a single smallest indoor unit to over-matching the indoor and outdoor unit ratio; the operating conditions are relatively complex. These situations pose challenges to the reliability of multi-connected unit systems. In a multi-connected unit system, the compressor is the heart of the system, and the safe operation of the compressor is crucial. Ensuring sufficient lubrication of the compressor and preventing liquid compression and liquid return are crucial key parts in the reliability of multi-connected unit systems.

[0003] When designing existing multi-connected unit systems, the maximum refrigerant volume is often used as a benchmark, and the compressor oil volume is set according to the maximum refrigerant volume ratio to ensure the compressor oil return state when the system has the longest refrigerant pipe and the maximum refrigerant volume; however, during actual installation, the refrigerant pipe length of the air-conditioning system is much lower than the maximum pipe length, and the actual refrigerant volume in the system is also much lower than the maximum refrigerant volume. Thus, in the case of short refrigerant pipes, the actual compressor oil ratio (compressor oil / refrigerant volume ratio, i.e., oil ratio) is too high, resulting in a decrease in energy efficiency. Summary of the Invention

[0004] The present invention provides an oil separation component, a multi-connected unit system and a control method to solve the defect in the prior art that the compressor oil ratio is too high, resulting in a decrease in energy efficiency, and to improve the energy efficiency of air-conditioning operation on the premise of ensuring sufficient lubrication of the compressor.

[0005] The present invention provides an oil separation component, including: An oil separator; An oil storage tank, the inlet of which is connected to the outlet of the oil separator through a first control valve; A pipeline component, including an oil storage pipeline and an oil discharge pipeline that communicate with the inner cavity of the oil storage tank, the inlet of the oil storage pipeline is higher than the inlet of the oil discharge pipeline, the outlets of the oil storage pipeline and the oil discharge pipeline are used to connect to the suction port of the compressor, a second control valve is provided on the oil storage pipeline, and a third control valve is provided on the oil discharge pipeline.

[0006] According to the oil separation component provided by the present invention, a slantingly arranged oil baffle is provided in the oil storage tank, and at least part of the oil baffle is located below the inlet of the oil storage tank.

[0007] According to the oil separation component provided by the present invention, an oil quantity detection element is provided in the oil storage tank.

[0008] An oil separation component provided by the present invention, a three-way valve is provided at the oil outlet of the oil separator, a first outlet of the three-way valve is connected to the first control valve, and a second outlet of the three-way valve is used to connect to the suction port of the compressor.

[0009] An oil separation component provided by the present invention further includes a controller, and the controller is electrically connected to the first control valve, the second control valve, the third control valve, and the oil quantity detection element.

[0010] The present invention further provides a multi-connected air conditioner system, including a compressor and the oil separation component described in any one of the above, an exhaust port of the compressor is connected to an inlet of the oil separator, and a suction port of the compressor is respectively communicated with an oil outlet of the oil separator, an outlet of the oil storage pipeline, and an outlet of the oil discharge pipeline.

[0011] The present invention further provides a control method for a multi-connected air conditioner system. Based on the multi-connected air conditioner system as described above, the method includes: Obtain the current operating parameters of the multi-connected air conditioner system; According to the current operating parameters, determine that the compressor has too much oil, and control the first control valve and the second control valve to open to accumulate the medium-pressure oil in the oil separator in the oil storage tank.

[0012] The present invention further provides a control method for a multi-connected air conditioner system, and the method further includes: Determine that the compressor lacks oil, and control the first control valve and the third control valve to open to discharge the medium-pressure oil in the oil storage tank to the compressor.

[0013] The present invention further provides a control method for a multi-connected air conditioner system. Determining that the compressor has too much oil according to the current operating parameters includes: When the ambient temperature is higher than the temperature threshold, determine that the compressor has too much oil, and / or, When the working mode is the refrigeration mode, determine that the compressor has too much oil.

[0014] The present invention further provides a control method for a multi-connected air conditioner system. Determining that the compressor has too much oil according to the current operating parameters includes: Obtain the current indoor unit load of the current indoor unit and the current outdoor unit load of the current outdoor unit; When the ratio of the current indoor unit load to the current outdoor unit load is greater than the preset startup rate, determine that the compressor has too much oil.

[0015] The oil separation component provided by the present invention adds an oil storage tank at the oil outlet of the oil separator. When there is too much compressor oil returning to the compressor, by controlling the opening of the first control valve and the second control valve, the compressor oil in the oil separator is accumulated in the oil storage tank to reduce the amount of compressor oil returning to the compressor; and when there is too little compressor oil returning to the compressor, the compressor oil in the oil storage tank is discharged to the compressor to increase the amount of compressor oil returning to the compressor; thereby effectively adjusting the amount of compressor oil returning to the compressor, improving the energy efficiency of air conditioner operation on the premise of ensuring sufficient lubrication of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 is a schematic structural diagram of the oil separation component provided by the present invention.

[0018] Figure 2 is one of the schematic flowcharts of the control method of the multi-connected air conditioner system provided by the present invention.

[0019] Figure 3 is another schematic flowchart of the control method of the multi-connected air conditioner system provided by the present invention.

[0020] Figure 4 is yet another schematic flowchart of the control method of the multi-connected air conditioner system provided by the present invention.

[0021] Figure 5 is a schematic structural diagram of the control device of the multi-connected air conditioner system provided by the present invention.

[0022] Figure 6 is a schematic structural diagram of the electronic device provided by the present invention.

[0023] Reference Signs: 10, oil separator; 20, oil storage tank; 21, oil retaining member; 31, oil storage pipeline; 32, oil discharge pipeline; 33, return pipeline; 40, first control valve; 50, second control valve; 60, third control valve; 70, three-way valve; 80, compressor; 81, suction port; 82, exhaust port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following further describes the embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0028] In the description of this specification, the description referring to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0029] An embodiment of the first aspect of the present invention provides an oil separation assembly, such as Figure 1 shown. The oil separation assembly includes an oil separator 10, an oil storage tank 20, and pipeline components. The inlet of the oil storage tank 20 is connected to the oil outlet of the oil separator 10 through a first control valve 40. The pipeline components include an oil storage pipeline 31 and an oil discharge pipeline 32 that communicate with the inner cavity of the oil storage tank 20. The inlet of the oil storage pipeline 31 is higher than the inlet of the oil discharge pipeline 32. The outlets of the oil storage pipeline 31 and the oil discharge pipeline 32 are used to connect to the suction port 81 of the compressor 80. A second control valve 50 is provided on the oil storage pipeline 31, and a third control valve 60 is provided on the oil discharge pipeline 32.

[0030] It can be understood that the oil outlet of the oil separator 10 is connected to the compressor 80. In this embodiment, an oil storage tank 20 is added to the oil outlet of the oil separator 10. The oil storage pipeline 31 and the oil discharge pipeline 32 are provided on the oil storage tank 20. The outlets of the oil storage pipeline 31 and the oil discharge pipeline 32 are connected to each other and connected to the suction port 81 of the compressor 80. The inlet of the oil storage pipeline 31 is higher than the inlet of the oil discharge pipeline 32. The pressurized oil at the oil outlet of the oil separator 10 is accumulated in the oil storage tank 20 through the oil storage pipeline 31 with a high inlet, and the pressurized oil in the oil storage tank 20 is discharged to the compressor 80 through the oil discharge pipeline 32 with a low inlet. Thus, the amount of pressurized oil returned to the compressor 80 is adjusted by the opening and closing of the second control valve 50 and the third control valve 60. It should be noted here that the volume of the oil storage tank 20 is reasonably designed according to the demand for regulating the pressurized oil.

[0031] Specifically, when the amount of pressurized oil returned from the oil separator 10 to the compressor 80 is excessive, the first control valve 40 and the second control valve 50 are controlled to open to accumulate the pressurized oil in the oil separator 10 in the oil storage tank 20, reduce the amount of pressurized oil returned to the compressor 80, and thereby improve the energy efficiency of the air conditioner operation.

[0032] It should be noted that when the amount of pressurized oil returned from the oil separator 10 to the compressor 80 is too small, it affects the lubrication of the compressor 80 and is likely to cause wear of the compressor 80. In this embodiment, when the amount of pressurized oil returned from the oil separator 10 to the compressor 80 is too small, the first control valve 40 and the third control valve 60 are controlled to open to discharge the pressurized oil in the oil storage tank 20 to the compressor 80, increase the amount of pressurized oil returned to the compressor 80, avoid wear of the compressor 80, and thereby improve the service life of the multi-connected air conditioner system.

[0033] The oil separation component provided by the embodiment of the present invention adds an oil storage tank 20 at the oil outlet of the oil separator 10. When there is too much compressor oil returning to the compressor 80, by controlling the opening of the first control valve 40 and the second control valve 50, the compressor oil in the oil separator 10 is accumulated in the oil storage tank 20 to reduce the compressor oil returning to the compressor 80; and when there is too little compressor oil returning to the compressor 80, the compressor oil in the oil storage tank 20 is discharged to the compressor 80 to increase the compressor oil returning to the compressor 80; thereby effectively regulating the amount of compressor oil returning to the compressor 80, and improving the energy efficiency of the air conditioner operation on the premise of ensuring sufficient lubrication of the compressor 80.

[0034] According to the embodiment of the present invention, the oil storage tank 20 has three working states, which are specifically as follows: First, the first control valve 40, the second control valve 50, and the third control valve 60 are all closed, and the oil storage tank 20 is in a closed state. It should be noted here that the closed state can be that the amount of compressor oil returning to the compressor 80 meets the working requirements, or after the regulation of the amount of compressor oil is completed, the multi-connected system maintains this closed state.

[0035] Second, the first control valve 40 and the second control valve 50 are opened, and the third control valve 60 is closed, and the oil storage tank 20 is in an oil storage state.

[0036] Specifically, after the compressor oil in the oil separator 10 passes through the oil outlet of the oil separator 10, a part enters the compressor 80 for the working cycle, and the other part enters the oil storage tank 20. Since the inlet of the oil storage pipeline 31 is located at the high position of the oil storage tank 20, usually only gaseous refrigerant passes through the oil storage pipeline 31 and flows through the compressor 80, and the compressor oil entering the oil storage tank 20 will be accumulated in the oil storage tank 20 until the oil quantity in the oil storage tank 20 reaches the accumulation required value, then the first control valve 40 and the second control valve 50 are closed, so that the oil storage tank 20 returns to the closed state.

[0037] Optionally, after the oil quantity in the oil storage tank 20 reaches the accumulation required value, first close the first control valve 40, and then close the second control valve 50, and evacuate the refrigerant in the oil storage tank 20 by using the low pressure on the outlet side (suction side of the compressor 80) of the oil storage pipeline 31 to reduce the refrigerant remaining in the oil storage tank 20. It should be noted here that the closing time interval between the second control valve 50 and the first control valve 40 can be designed and adjusted according to the actual situation.

[0038] It should be noted that during the actual operation of the multi-connected system, the amount of pressure oil returning to the compressor 80 (excessive) is denoted as A1; under the ideal operating state of the multi-connected system, the amount of pressure oil returning to the compressor 80 is denoted as A2. Then, the accumulation requirement value can be reasonably designed according to the difference between A1 and A2, so that the pressure oil returning to the compressor 80 during the actual operation process meets the ideal operating state of the system. For example, during the actual operation process, the larger A1 is, the larger the accumulation requirement value is; the smaller A1 is, the smaller the accumulation requirement value is.

[0039] Thirdly, the first control valve 40 and the third control valve 60 are opened, and the second control valve 50 is closed, and the oil storage tank 20 is in the oil discharge state.

[0040] Specifically, since the inlet of the oil discharge pipeline 32 is located at the lower position of the oil storage tank 20, when the oil stored in the oil storage tank 20 is in the oil storage state, the pressure oil in the oil storage tank 20 will be preferentially discharged, and the pressure difference between the exhaust side of the compressor 80 and the suction side of the compressor 80 (the outlet side of the oil discharge pipeline) is utilized to effectively discharge the pressure oil stored in the oil storage tank 20 to the suction side of the compressor 80 until the amount of oil discharged from the oil storage tank 20 reaches the oil discharge requirement value or all the pressure oil in the oil storage tank 20 is discharged, and then the first control valve 40 and the third control valve 60 are closed to make the oil storage tank 20 return to the closed state.

[0041] It should be noted that during the actual operation of the multi-connected system, the amount of pressure oil returning to the compressor 80 (too little) is denoted as A3; under the ideal operating state of the multi-connected system, the amount of pressure oil returning to the compressor 80 is denoted as A2. Then, the oil discharge requirement value can be reasonably designed according to the difference between A2 and A3, so that the pressure oil returning to the compressor 80 during the actual operation process meets the ideal operating state of the system. For example, during the actual operation process, the smaller A3 is, the larger the oil discharge requirement value is; the larger A3 is, the smaller the oil discharge requirement value is.

[0042] In some embodiments, an oil quantity detection element is arranged in the oil storage tank 20 to measure the amount of pressure oil in the oil storage tank 20. The oil quantity detection element can adopt an oil level detection element, such as a float type oil level sensor, a capacitance type oil level sensor, an ultrasonic oil level sensor, etc. Of course, the oil quantity detection element can also adopt other measurement elements such as a pressure sensor. Among them, the pressure sensor indirectly judges the oil quantity by detecting the pressure difference between the inlet and outlet of the oil storage tank 20.

[0043] In some embodiments, a baffle 21 arranged obliquely is arranged in the oil storage tank 20. The baffle 21 is at least partially located below the inlet of the oil storage tank 20. By arranging the baffle 21, the air flow impact on the pressure oil in the oil storage tank 20 can be avoided, so as to prevent the liquid level in the oil storage tank 20 from fluctuating or generating foam, thereby improving the accuracy of the oil quantity detection in the oil storage tank 20.

[0044] Optionally, the oil baffle 21 is an oil baffle connected to the side wall of the oil storage tank 20 and arranged obliquely downward. One end of the oil baffle away from the side wall of the oil storage tank 20 is located below the inlet of the oil storage tank 20 and close to the bottom of the oil storage tank 20.

[0045] In some embodiments, a three-way valve 70 is provided at the oil outlet of the oil separator 10. The first outlet of the three-way valve 70 is connected to the first control valve 40, and the second outlet of the three-way valve 70 is connected to the suction port 81 of the compressor 80 through the oil return pipeline 33. Thus, the oil outlet of the oil separator 10 is respectively communicated with the oil storage tank 20 and the compressor 80 through the three-way valve 70.

[0046] Optionally, the flow rate of the first outlet of the three-way valve 70 is greater than that of the second outlet of the three-way valve 70. When the first control valve 40 is opened, more compressor oil flowing into the oil storage tank 20 than that flowing into the compressor 80.

[0047] In this embodiment, the three-way valve 70 is an asymmetric three-way valve, specifically a T-shaped three-way valve. The first outlet of the T-shaped three-way valve is connected to the first control valve 40, and the second outlet of the T-shaped three-way valve is connected to the suction port 81 of the compressor 80 through the oil return pipeline 33. Thus, by making full use of the uneven flow diversion characteristics of the T-shaped three-way valve, more compressor oil flowing into the oil storage tank 20 than that flowing into the oil return pipeline 33, increasing the oil storage effect of the oil storage tank 20.

[0048] In some embodiments, a controller is further included. The controller is electrically connected to the first control valve 40, the second control valve 50, the third control valve 60, and the oil quantity detection element. For example, the first control valve 40, the second control valve 50, and the third control valve 60 can adopt solenoid valves.

[0049] It can be understood that when there is too much compressor oil returning to the compressor 80, that is, when the compressor 80 has too much oil, the controller controls the first control valve 40 and the second control valve 50 to open, so as to accumulate the compressor oil in the oil separator 10 in the oil storage tank 20, and the current compressor oil quantity in the oil storage tank 20 is detected in real time through the oil quantity detection element. The controller obtains the current compressor oil quantity, and when the current compressor oil quantity reaches the accumulation required value, the controller controls the first control valve 40 and the second control valve 50 to close.

[0050] When the pressure oil returning to the compressor 80 is too little, that is, when the compressor 80 lacks oil, the controller controls the first control valve 40 and the third control valve 60 to open, so as to discharge the pressure oil in the oil storage tank 20 to the suction side of the compressor 80, and the current pressure oil volume in the oil storage tank 20 is detected in real time through the oil volume detection element. The controller obtains the current pressure oil volume, and when the current pressure oil volume reaches the oil discharge requirement value or all the pressure oil in the oil storage tank 20 is discharged, the controller controls the first control valve 40 and the third control valve 60 to close. In this way, the automatic and precise control of the pressure oil returning to the compressor 80 can be realized, and the performance and stability of the system can be improved.

[0051] An embodiment of the second aspect of the present invention provides a multi-connected air conditioner system, including a compressor 80 and the oil separation assembly provided in any of the above embodiments. The exhaust port 82 of the compressor 80 is connected to the inlet of the oil separator 10, and the suction port 81 of the compressor 80 is respectively communicated with the oil outlet of the oil separator 10, the outlet of the oil storage pipeline 31 and the outlet of the oil discharge pipeline 32.

[0052] It should be noted that when the ratio of the medium-pressure lubricating oil in the system is too high, the following defects will occur: part of the medium-pressure lubricating oil adheres to the heat exchanger, forming an oil film thermal resistance that affects the heat exchange efficiency of the heat exchanger; the medium-pressure lubricating oil accumulates in the pipeline, resulting in an increase in the frictional loss along the pipeline, an increase in the pressure loss effect, and an impact on the refrigerant circulation efficiency; too much medium-pressure lubricating oil will cause pressure imbalance in the system, manifested as an abnormally high pressure in the condenser and an abnormally low pressure in the evaporator; although too much medium-pressure lubricating oil does not improve the refrigeration and heating capacity, the power of the compressor will increase, resulting in a decrease in the energy efficiency of the system; too much medium-pressure lubricating oil will cause insufficient mixing of the medium-pressure lubricating oil and the refrigerant, resulting in oil stratification, and even cause blockage of the expansion valve or capillary tube. When the ratio of the medium-pressure lubricating oil in the system is too high, if the method of adjusting the oil return pipeline is adopted, specifically by adjusting the diameter of the oil return pipe of the oil separator, or adding a solenoid valve or an electronic expansion valve to adjust the oil return flow rate, this method can only adjust the amount of medium-pressure lubricating oil returning to the compressor and cannot adjust the amount of medium-pressure lubricating oil actually circulating in the air-conditioning system; in the case of short refrigerant pipelines and relatively small total refrigerant volume, since the medium-pressure lubricating oil is still set according to the maximum refrigerant volume of the long refrigerant pipeline, it will still cause the ratio of the medium-pressure lubricating oil to be too high, resulting in a decrease in the system capacity and energy efficiency. If the method of modifying the gas-liquid separator is adopted, which is to adjust by increasing the volume of the gas-liquid separator or adding an additional oil return pipeline at the bottom, it will also have the same problems as the method of adjusting the oil return pipeline. The multi-connected air-conditioning system of this embodiment adds a storage tank 20 at the oil outlet of the oil separator 10. By controlling the opening of the first control valve 40 and the second control valve 50, the medium-pressure lubricating oil in the oil separator 10 is accumulated in the storage tank 20, reducing the medium-pressure lubricating oil returning to the compressor 80, thereby avoiding the above-mentioned defects caused by too high a ratio of the medium-pressure lubricating oil; and when the medium-pressure lubricating oil returning to the compressor 80 is too little, the medium-pressure lubricating oil in the storage tank 20 is discharged to the compressor 80 to increase the medium-pressure lubricating oil returning to the compressor 80; thus, it can effectively adjust the amount of medium-pressure lubricating oil returning to the compressor 80, ensure that the actually flowing medium-pressure lubricating oil meets the system requirements, and can maximize the capacity and energy efficiency on the premise of ensuring sufficient lubrication of the compressor 80, effectively improving the energy efficiency of air-conditioning operation; and the multi-connected air-conditioning system of this embodiment only adds a storage tank 20 at the oil outlet of the oil separator 10, without the need to change the existing system structure, and the modification is simple.

[0053] It should be noted that if manual adjustment of the amount of medium-pressure lubricating oil is adopted, during system commissioning, the capacity and energy efficiency of the air-conditioning system can be improved by reducing the amount of medium-pressure lubricating oil; however, the disadvantage is that the operation of adjusting the amount of medium-pressure lubricating oil is complex, the practicability is poor, and the reliability is relatively low. If only medium-pressure lubricating oil is added for short refrigerant pipelines during factory production and the medium-pressure lubricating oil is added by the staff according to the actual additional refrigerant volume in the later stage, it will greatly increase the installation operation difficulty and also lead to uncontrollable system reliability. The multi-connected air-conditioning system of this embodiment compensates and controls the amount of medium-pressure lubricating oil returning to the compressor 80, with simple operation and improved reliability of system operation.

[0054] The multi-connected air conditioner system of this embodiment has the following characteristics: First, it greatly improves the product reliability; it can effectively adjust the amount of pressure oil returning to the compressor 80, so that the pressure oil returning to the compressor 80 is neither too much nor too little. Second, it has strong practicability; it can effectively improve the energy efficiency of the air conditioner operation. By adjusting the actual ratio of pressure oil in the system, it can avoid the situation that too much pressure oil in the air conditioner affects the effect, and too little affects lubrication. Third, it is easy to operate; no complex operation is required, and it can be selected to execute automatically during the commissioning of the air conditioner system. Fourth, it has strong expandability; in addition to the first operation, it can also be controlled during the use of the air conditioner. The actual amount of pressure oil in the system can be adjusted according to the situation, and it can be used to handle the complex state of the multi-connected air conditioner system. Fifth, the replacement cost is low; there is no need to modify the existing air conditioner system, and only the oil storage tank 20 needs to be installed in the original air conditioner system.

[0055] Based on the above multi-connected air conditioner system, an embodiment of the third aspect of the present invention proposes a control method for a multi-connected air conditioner system, as Figure 2 shown, the control method includes the following steps: Step 100, obtain the current operating parameters of the multi-connected air conditioner system.

[0056] Step 200, determine that the compressor 80 has too much oil according to the current operating parameters, and control the first control valve 40 and the second control valve 50 to open, so as to accumulate the pressure oil in the oil separator 10 in the oil storage tank 20.

[0057] It can be understood that obtaining the current operating parameters of the multi-connected air conditioner system, judging whether the pressure oil returning from the oil separator 10 to the compressor 80 is too much based on the current operating parameters, that is, judging whether the compressor 80 has too much oil. If so, it is determined that the compressor 80 has too much oil, and when the compressor 80 has too much oil, by controlling the first control valve 40 and the second control valve 50 to open, the pressure oil in the oil separator 10 is accumulated in the oil storage tank 20, reducing the amount of pressure oil returning to the compressor 80, thereby improving the energy efficiency of the air conditioner operation.

[0058] Further, as Figure 3 shown, the control method further includes the following steps: Step 300, determine that the compressor 80 lacks oil, and control the first control valve 40 and the third control valve 60 to open, so as to discharge the pressure oil in the oil storage tank 20 to the compressor 80.

[0059] It can be understood that to determine whether the compressor 80 has excessive oil. If not, there are situations where the compressor 80 has insufficient oil and the compressor 80 has neither excessive nor insufficient oil. In the case where the compressor 80 has insufficient oil, by controlling the opening of the first control valve 40 and the third control valve 60, the pressurized lubricating oil in the oil storage tank 20 is discharged to the compressor 80 to increase the amount of pressurized lubricating oil returning to the compressor 80, avoid wear of the compressor 80, and thus improve the service life of the multi-connected air conditioner system. It should be noted here that in the case where the compressor 80 has neither excessive nor insufficient oil, it means that the pressurized lubricating oil returned from the current oil separator 10 to the compressor 80 meets the working requirements. At this time, no adjustment is made to the system, and the first control valve 40, the second control valve 50, and the third control valve 60 are all closed, and the oil storage tank 20 is in a closed state.

[0060] In some embodiments, the current operating parameters include the ambient temperature. In step 200, according to the current operating parameters, it is determined that the compressor 80 has excessive oil, which specifically includes the following content: In the case where the ambient temperature is higher than the temperature threshold, it is determined that the compressor 80 has excessive oil.

[0061] It can be understood that the operating environment of the system is identified to compensate for the demand for pressurized lubricating oil. Specifically, when the operating environment is high temperature, that is, when the ambient temperature is higher than the temperature threshold, it is determined that the compressor 80 has excessive oil, and the first control valve 40 and the second control valve 50 are controlled to open to accumulate the pressurized lubricating oil in the oil separator 10 in the oil storage tank 20; when the operating environment is low temperature, that is, when the ambient temperature is lower than the temperature threshold, it is determined that the compressor 80 has insufficient oil, and the first control valve 40 and the third control valve 60 are controlled to open to discharge the pressurized lubricating oil in the oil storage tank 20 to the compressor 80 to improve the operating reliability of the compressor 80.

[0062] In some embodiments, the current operating parameters include the working mode. In step 200, according to the current operating parameters, it is determined that the compressor 80 has excessive oil, which specifically includes the following content: In the case where the working mode is the refrigeration mode, it is determined that the compressor 80 has excessive oil.

[0063] It can be understood that the operating conditions of the system are identified to compensate for the demand for pressurized lubricating oil. Specifically, when the system is in the refrigeration mode, it is determined that the compressor 80 has excessive oil, and the first control valve 40 and the second control valve 50 are controlled to open to accumulate the pressurized lubricating oil in the oil separator 10 in the oil storage tank 20; when the system is in the heating mode, it is determined that the compressor 80 has insufficient oil, and the first control valve 40 and the third control valve 60 are controlled to open to discharge the pressurized lubricating oil in the oil storage tank 20 to the compressor 80 to improve the operating reliability of the compressor 80.

[0064] It should be noted that when the current operating parameters include the ambient temperature and the working mode at the same time, the operating conditions of the recognition system are identified. The system is in the high-temperature refrigeration condition (high-temperature environment, refrigeration mode). Control the first control valve 40 and the second control valve 50 to open, so as to accumulate the medium-pressure oil in the oil separator 10 in the oil storage tank 20 and improve the refrigeration capacity; when the system is in the low-temperature heating condition (low-temperature environment, heating mode), control the first control valve 40 and the third control valve 60 to open, so as to discharge the medium-pressure oil in the oil storage tank 20 to the compressor 80 to improve the operating reliability of the compressor 80.

[0065] In some embodiments, such as Figure 4 shown, in step 200, according to the current operating parameters, it is determined that the compressor 80 has excessive oil, which specifically includes the following steps: Step 210: Obtain the current indoor unit load of the current indoor unit and the current outdoor unit load of the current outdoor unit.

[0066] Step 220: When the ratio of the current indoor unit load to the current outdoor unit load is greater than the preset startup rate, it is determined that the compressor 80 has insufficient oil.

[0067] It can be understood that the multi-connected air-conditioning system includes multiple indoor units and multiple outdoor units. When all the outdoor units and indoor units are turned on, calculate the total load of the outdoor units and the total load of the indoor units. The total load of the outdoor units is the sum of the frequencies of all outdoor units, and the total load of the indoor units is the sum of the frequencies of all indoor units. The ratio of the total load of the indoor units to the total load of the outdoor units is used as the preset startup rate; the current indoor unit load is the sum of the frequencies of all the currently turned-on indoor units, and the current outdoor unit load is the sum of the frequencies of all the currently turned-on outdoor units. Calculate the ratio of the current indoor unit load to the current outdoor unit load. When the ratio is greater than the preset startup rate, control the first control valve 40 and the third control valve 60 to open, so as to discharge the medium-pressure oil in the oil storage tank 20 to the compressor 80 to increase the amount of medium-pressure oil returned to the compressor 80; and when the ratio is less than the preset startup rate, control the first control valve 40 and the second control valve 50 to open, so as to accumulate the medium-pressure oil in the oil separator 10 in the oil storage tank 20.

[0068] It should be noted that when the multi-connected system includes one outdoor unit and multiple indoor units, the oil quantity of the compression oil returning to the compressor 80 is adjusted according to the startup conditions of the indoor units. When the number of started indoor units is small, the first control valve 40 and the second control valve 50 are controlled to open, so as to accumulate the compression oil in the oil separator 10 in the oil storage tank 20. When the number of started indoor units is large, the first control valve 40 and the third control valve 60 are controlled to open, so as to discharge the compression oil in the oil storage tank 20 to the compressor 80, increasing the oil quantity of the compression oil returning to the compressor 80, which can effectively improve the effect of the machine when it is started alone and ensure the reliability of high-frequency operation. It should be noted here that the more or less of the number of started indoor units is determined based on the indoor unit startup threshold. When the number of started indoor units is less than the indoor unit startup threshold, it is judged that the number of started indoor units is small. When the number of started indoor units is greater than the indoor unit startup threshold, it is judged that the number of started indoor units is large.

[0069] In some embodiments, the current operating parameters may further include system operating parameters, such as adjusting the compression oil quantity according to the discharge superheat degree and the suction superheat degree.

[0070] Specifically, when the system is at the discharge superheat degree, it is determined that the compressor 80 has too much oil, and the first control valve 40 and the second control valve 50 are controlled to open, so as to accumulate the compression oil in the oil separator 10 in the oil storage tank 20. When the system is at the suction superheat degree, it is determined that the compressor 80 has too little oil, and the first control valve 40 and the third control valve 60 are controlled to open, so as to discharge the compression oil in the oil storage tank 20 to the compressor 80.

[0071] In some embodiments, the current operating parameters further include the elevation difference between the indoor unit and the outdoor unit. When the installation height of the indoor unit is higher than that of the outdoor unit, it is determined that the compressor 80 has too much oil, and the first control valve 40 and the second control valve 50 are controlled to open, so as to accumulate the compression oil in the oil separator 10 in the oil storage tank 20. When the installation height of the indoor unit is lower than that of the outdoor unit, it is determined that the compressor 80 has too little oil, and the first control valve 40 and the third control valve 60 are controlled to open, so as to discharge the compression oil in the oil storage tank 20 to the compressor 80.

[0072] In some embodiments, the current operating parameters include the current piping installation length. In step 200, determining that the compressor 80 has too much oil according to the current operating parameters specifically includes the following content: When the current piping installation length is less than the longest piping length, it is determined that the compressor 80 has too much oil.

[0073] It can be understood that when obtaining the current pipe installation length and the current pipe installation length is less than the maximum pipe length, it is determined that the compressor 80 has too much oil, and the first control valve 40 and the second control valve 50 are controlled to open to accumulate the medium-pressure lubricating oil in the oil separator 10 in the oil storage tank 20; when the current pipe installation length is greater than the maximum pipe length, it is determined that the compressor 80 has too little oil, and the first control valve 40 and the third control valve 60 are controlled to open to drain the medium-pressure lubricating oil in the oil storage tank 20 to the compressor 80 to improve the operation reliability of the compressor 80.

[0074] Furthermore, according to the current pipe installation length and the target ratio of lubricating oil for the compressor, the target amount of lubricating oil corresponding to the current pipe installation length is determined, and based on the difference between the target amount of lubricating oil and the actual amount of lubricating oil in the system under pressure, the oil storage and drainage of the oil storage tank 20 are performed; when the target amount of lubricating oil is less than the actual amount of lubricating oil in the system under pressure, the oil storage tank 20 stores oil; when the target amount of lubricating oil is greater than the actual amount of lubricating oil in the system under pressure, the oil storage tank 20 drains oil.

[0075] The control device of the multi-connected air-conditioning system provided by the present invention will be described below. The control device of the multi-connected air-conditioning system described below can be mutually referred to the control method of the multi-connected air-conditioning system described above.

[0076] The present invention also provides a control device of a multi-connected air-conditioning system, as Figure 5 shown. The control device includes an acquisition module 510 and a first control module 520; wherein: The acquisition module 510 is used to acquire the current operation parameters of the multi-connected air-conditioning system.

[0077] The first control module 520 is used to determine that the compressor has too much oil according to the current operation parameters, and control the first control valve and the second control valve to open to accumulate the medium-pressure lubricating oil in the oil separator in the oil storage tank.

[0078] Based on any of the above embodiments, the control device further includes a second control module, and the second control module is used to determine that the compressor lacks oil and control the first control valve and the third control valve to open to drain the medium-pressure lubricating oil in the oil storage tank to the compressor.

[0079] Figure 6 The schematic physical structure diagram of an electronic device is exemplified, as Figure 6As shown in the figure, the electronic device may include: a processor 610, a communications interface 620, a memory 630, and a communication bus 640. Among them, the processor 610, the communications interface 620, and the memory 630 complete their mutual communication through the communication bus 640. The processor 610 can call the logical instructions in the memory 630 to execute the control method of the multi-connected system. The method includes: obtaining the current operating parameters of the multi-connected system; determining that the compressor has too much oil according to the current operating parameters, and controlling the first control valve and the second control valve to open so as to accumulate the medium-pressure oil in the oil separator in the oil storage tank.

[0080] In addition, when the logical instructions in the above-mentioned memory 630 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several 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 methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0081] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the multi-connected system provided by the above-mentioned various methods. The method includes: obtaining the current operating parameters of the multi-connected system; determining that the compressor has too much oil according to the current operating parameters, and controlling the first control valve and the second control valve to open so as to accumulate the medium-pressure oil in the oil separator in the oil storage tank.

[0082] On the other hand, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the control method of the multi-connected system provided by the above-mentioned various methods. The method includes: obtaining the current operating parameters of the multi-connected system; determining that the compressor has too much oil according to the current operating parameters, and controlling the first control valve and the second control valve to open so as to accumulate the medium-pressure oil in the oil separator in the oil storage tank.

[0083] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0084] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil separation component, characterized in that, Comprising: An oil separator; An oil storage tank, the inlet of which is connected to the oil outlet of the oil separator through a first control valve; A pipeline component, including an oil storage pipeline and an oil discharge pipeline communicating with the inner cavity of the oil storage tank, the inlet of the oil storage pipeline is higher than the inlet of the oil discharge pipeline, the outlets of the oil storage pipeline and the oil discharge pipeline are used to connect to the suction port of the compressor, a second control valve is arranged on the oil storage pipeline, and a third control valve is arranged on the oil discharge pipeline.

2. The oil separation component according to claim 1, wherein An oil baffle arranged obliquely is arranged in the oil storage tank, and at least part of the oil baffle is located below the inlet of the oil storage tank.

3. The oil separation assembly according to claim 2, wherein, An oil quantity detection element is arranged in the oil storage tank.

4. The oil separation assembly according to any one of claims 1 to 3, characterized in that A three-way valve is arranged at the oil outlet of the oil separator, a first outlet of the three-way valve is connected to the first control valve, and a second outlet of the three-way valve is used to connect to the suction port of the compressor.

5. The oil separation assembly according to claim 3, wherein It further includes a controller, and the controller is electrically connected to the first control valve, the second control valve, the third control valve, and the oil quantity detection element.

6. A multi-connected air-conditioning system, characterized in that, Comprising a compressor and an oil separation assembly according to any one of claims 1 to 5, the exhaust port of the compressor is connected to the inlet of the oil separator, and the suction port of the compressor is respectively communicated with the oil outlet of the oil separator, the outlet of the oil storage pipeline, and the outlet of the oil discharge pipeline.

7. A control method for a multi-connected air-conditioning system, characterized in that, Based on the multi-connected air conditioner system according to claim 6, the method includes: Obtaining the current operating parameters of the multi-connected air conditioner system; According to the current operating parameters, determining that the compressor has too much oil, and controlling the first control valve and the second control valve to open to accumulate the medium-pressure oil in the oil separator in the oil storage tank.

8. The control method of the multi-connected air conditioner system according to claim 7, characterized in that, The method further includes: Determining that the compressor lacks oil, and controlling the first control valve and the third control valve to open to discharge the medium-pressure oil in the oil storage tank to the compressor.

9. The control method of the multi-connected air conditioner system according to claim 8, characterized in that, The determining that the compressor has too much oil according to the current operating parameters includes: When the ambient temperature is higher than the temperature threshold, determining that the compressor has too much oil, and / or, When the working mode is the refrigeration mode, determining that the compressor has too much oil.

10. The control method of the multi-connected air conditioner system according to claim 8, wherein The determining that the compressor has too much oil according to the current operating parameters includes: Obtaining the current indoor unit load of the current indoor unit and the current outdoor unit load of the current outdoor unit; When the ratio of the current indoor unit load to the current outdoor unit load is greater than the preset starting rate, determining that the compressor has too much oil.

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