Oil return control methods, devices, control systems, vehicles and storage media

Abstract

This application provides a method, apparatus, control system, vehicle, and storage medium for oil return control. The compressor lubrication system includes: a scroll compressor; an oil-gas separator connected to the outlet of the scroll compressor; and the oil outlet of the oil-gas separator connected to the oil inlet of the scroll compressor via an oil return quantity control device. The method includes: acquiring the operating parameters of the scroll compressor; the operating parameters including the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor; determining the current oil return demand of the scroll compressor based on the operating parameters; and controlling the oil return capacity of the oil return quantity control device based on the oil return demand and the pressure difference between the discharge pressure and suction pressure of the scroll compressor. The solution of this application can improve the operating efficiency of the scroll compressor.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and more specifically, to an oil return control method, device, control system, vehicle, and storage medium. Background Technology

[0002] Scroll compressors are widely used in various automotive air conditioning systems due to their advantages such as small size, low noise, light weight, low vibration, low energy consumption, long lifespan, continuous and stable gas delivery, and reliable operation. Refrigeration oil plays a crucial role in lubrication, sealing, and cooling, and is an essential component for the operation of a scroll compressor. However, due to the structure of scroll compressors, too much refrigerant oil can easily lead to liquid slugging and damage, while too little refrigerant oil can cause insufficient sealing, internal leakage, and in severe cases, even dry running and burnout. Furthermore, both excessive and insufficient refrigerant oil levels in the scroll compressor will affect its operating efficiency. Summary of the Invention

[0003] The purpose of this application is to provide an oil return control method, device, control system, vehicle, and storage medium to achieve oil return control of a scroll compressor, thereby improving the operating efficiency of the scroll compressor while ensuring its normal operation.

[0004] This application provides a method for controlling the oil return of a compressor lubrication system. The compressor lubrication system includes: a scroll compressor; an oil-gas separator connected to the outlet of the scroll compressor; and the oil outlet of the oil-gas separator connected to the oil inlet of the scroll compressor via an oil return volume control device. The method includes:

[0005] The operating parameters of the scroll compressor are obtained; the operating parameters include the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor; the current oil return demand of the scroll compressor is determined based on the operating parameters of the scroll compressor; the oil return capacity of the oil return quantity controller is controlled based on the oil return demand and the pressure difference between the discharge pressure and suction pressure of the scroll compressor.

[0006] In the above implementation process, the current oil return demand of the scroll compressor is determined based on its discharge temperature, suction temperature, discharge pressure, and suction pressure. Then, the oil return capacity of the oil return control device is controlled based on the oil return demand and the pressure difference between the discharge and suction pressures of the scroll compressor. Since the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor reflect its operating status and thus its demand for refrigerant oil, dynamic oil return control based on the current oil return demand of the scroll compressor can be achieved, thereby reducing the risk of excessive or insufficient refrigerant oil in the scroll compressor. Simultaneously, dynamic oil return control ensures that the refrigerant oil level in the scroll compressor remains within its required range, thereby improving the operating efficiency of the scroll compressor.

[0007] Furthermore, the operating parameters also include the rotational speed and / or power consumption of the scroll compressor.

[0008] In the above implementation, the current oil return demand of the scroll compressor is further determined by combining the speed and / or power consumption of the scroll compressor. Since the speed and / or power consumption of the scroll compressor can more directly reflect the operating status of the scroll compressor, the determination of the current oil return demand of the scroll compressor can be more accurate when the speed and / or power consumption of the scroll compressor are combined to determine the current oil return demand of the scroll compressor, thereby making the oil return control more precise.

[0009] Furthermore, the compressor lubrication system further includes a first flow detection sensor, which is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor; the method further includes: acquiring the flow data detected by the first flow detection sensor, and determining the actual oil return volume of the scroll compressor based on the flow data; when the actual oil return volume reaches the current oil return demand of the scroll compressor, shutting off the oil return volume control device, or adjusting the oil return capacity of the oil return volume control device to match the oil output volume per unit time at the oil outlet of the scroll compressor.

[0010] Based on the above implementation method, by setting a first flow detection sensor, when the actual oil return volume reaches the current oil return demand of the scroll compressor, the oil return volume control device is turned off, or the oil return capacity of the oil return volume control device is adjusted to match the oil output volume per unit time of the scroll compressor outlet. This can reduce the risk of excessive refrigerant oil in the scroll compressor and reduce the operating load of the scroll compressor.

[0011] Further, determining the current oil return demand of the scroll compressor based on its operating parameters includes: obtaining the correspondence between the operating parameters and the oil return demand when the scroll compressor is at the target operating efficiency; and determining the current oil return demand of the scroll compressor from the correspondence based on the operating parameters of the scroll compressor.

[0012] The discharge temperature, suction temperature, discharge pressure, and suction pressure of a scroll compressor reflect its operating status and, consequently, its demand for refrigerant oil. Considering that the refrigerant oil consumption of a scroll compressor is essentially the same under identical operating conditions, the aforementioned implementation method can directly establish the correspondence between the operating parameters and the oil return demand when the scroll compressor reaches its target operating efficiency through extensive experiments. Based on the operating parameters, the current oil return demand of the scroll compressor can be determined from this correspondence. This method eliminates the need for flow detection equipment to monitor the refrigerant oil volume within the scroll compressor, resulting in lower implementation costs. Furthermore, since the obtained data is the correspondence between the operating parameters and the oil return demand when the scroll compressor reaches its target operating efficiency, controlling the oil return flow according to this determined correspondence allows the scroll compressor to operate near its target efficiency, thereby improving its overall efficiency.

[0013] Furthermore, before determining the current oil return demand of the scroll compressor based on its operating parameters, the method further includes: obtaining the current operating condition of the scroll compressor; obtaining the correspondence between the operating parameters and the oil return demand when the scroll compressor is at a target operating efficiency, including: obtaining the target correspondence corresponding to the current operating condition; the target correspondence is: under the current operating condition, the correspondence between the operating parameters and the oil return demand when the scroll compressor is at a target operating efficiency; determining the current oil return demand of the scroll compressor from the correspondence based on the operating parameters of the scroll compressor, including: determining the current oil return demand of the scroll compressor from the target correspondence based on the operating parameters of the scroll compressor.

[0014] In the above implementation, by setting corresponding operating parameters and oil return demand for different operating conditions, when determining the current oil return demand of the scroll compressor, the target correspondence for the current operating condition is first determined based on the current operating condition of the scroll compressor, and then the current oil return demand of the scroll compressor is determined based on the target correspondence. This ensures that the amount of refrigerant oil in the scroll compressor after oil return meets the requirements of the current operating condition, thereby making the working efficiency of the scroll compressor closer to the optimal efficiency point of the current operating condition and improving the working efficiency of the scroll compressor.

[0015] Furthermore, the compressor lubrication system further includes a second flow detection sensor, which is disposed at the oil outlet of the oil-gas separator; or, the compressor lubrication system further includes an oil quantity detection device, disposed on the scroll compressor, for detecting the amount of refrigerant oil in the scroll compressor; determining the current oil return demand of the scroll compressor based on the operating parameters of the scroll compressor includes: acquiring the detection value of the second flow detection sensor, and determining the amount of refrigerant oil in the scroll compressor based on the amount of refrigerant oil in the scroll compressor, the detection value of the second flow detection sensor, and the oil-gas separation rate of the oil-gas separator; or, acquiring the amount of refrigerant oil in the scroll compressor detected by the oil quantity detection device; acquiring the correspondence between the operating parameters of the scroll compressor at the target operating efficiency and the amount of refrigerant oil demand; determining the current amount of refrigerant oil demand of the scroll compressor from the correspondence based on the operating parameters of the scroll compressor; calculating the difference between the current amount of refrigerant oil demand of the scroll compressor and the amount of refrigerant oil in the scroll compressor to obtain the current oil return demand of the scroll compressor.

[0016] In the above implementation, the amount of refrigerant oil in the scroll compressor can be obtained by setting a second flow detection sensor or oil quantity detection device. As mentioned earlier, parameters such as the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor reflect its operating status, and thus its demand for refrigerant oil. Therefore, the correspondence between the operating parameters and the refrigerant oil demand when the scroll compressor is at the target operating efficiency can be pre-set through numerous experiments. Based on the difference between the current refrigerant oil demand and the amount of refrigerant oil in the scroll compressor, the current oil return demand can be obtained. Since the determination of both the current refrigerant oil demand and the amount of refrigerant oil in the scroll compressor is relatively accurate, the accuracy of the obtained oil return demand is also high. This ensures that the working efficiency of the scroll compressor after oil return is as close as possible to the target operating efficiency, thereby improving the overall efficiency of the scroll compressor.

[0017] Furthermore, before determining the current oil return demand of the scroll compressor based on its operating parameters, the method further includes: obtaining the current operating condition of the scroll compressor; obtaining the correspondence between the operating parameters and the refrigerant oil demand when the scroll compressor is at a target operating efficiency, including: obtaining the target correspondence corresponding to the current operating condition; the target correspondence is: under the current operating condition, the correspondence between the operating parameters and the refrigerant oil demand when the scroll compressor is at a target operating efficiency; determining the current refrigerant oil demand of the scroll compressor from the correspondence based on the operating parameters of the scroll compressor, including: determining the current refrigerant oil demand of the scroll compressor from the target correspondence based on the operating parameters of the scroll compressor.

[0018] In the above implementation, by setting corresponding operating parameters and the corresponding relationship between the amount of refrigeration oil required for different operating conditions, when determining the current oil return requirement of the scroll compressor, the target relationship corresponding to the current operating condition is first determined based on the current operating condition of the scroll compressor, and then the current oil return requirement of the scroll compressor is determined based on the target relationship. This ensures that the amount of refrigeration oil in the scroll compressor after oil return meets the requirements of the current operating condition of the scroll compressor, thereby making the working efficiency of the scroll compressor closer to the optimal efficiency point of the current operating condition and improving the working efficiency of the scroll compressor.

[0019] Furthermore, the compressor lubrication system also includes an oil collection tank; the oil collection tank is located between the oil outlet of the oil-gas separator and the oil return volume control device, and the first flow detection sensor is located after the oil collection tank.

[0020] In the above implementation, an oil collection tank can be set up to temporarily store excess refrigerant oil. By placing the first flow detection sensor after the oil collection tank, the detection value of the first flow detection sensor can accurately represent the actual amount of refrigerant oil returned. Thus, when the actual amount of oil returned reaches the current oil return demand of the scroll compressor, the oil return control device is turned off, or the oil return capacity of the oil return control device is adjusted to match the amount of oil discharged from the oil outlet of the scroll compressor per unit time. This can reduce the risk of excessive refrigerant oil in the scroll compressor and reduce the operating load of the scroll compressor.

[0021] Furthermore, the oil return quantity control device includes a first control valve; controlling the oil return capacity of the oil return quantity control device according to the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor includes: controlling the opening degree of the first control valve according to the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor.

[0022] In the above implementation, by using a first control valve as the oil return volume control device, the oil return volume per unit time can be easily controlled by controlling the opening degree of the first control valve, that is, the oil return capacity of the first control valve can be controlled.

[0023] Furthermore, the oil return quantity control device includes an oil pump; the oil return capacity of the oil return quantity control device is controlled according to the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, including: controlling the rotational speed of the oil pump according to the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor.

[0024] In the above implementation, by using an oil pump as the oil return volume control device, the oil return volume per unit time can be easily controlled by controlling the oil pump speed, that is, the oil return capacity of the oil pump can be controlled.

[0025] Further, the oil return quantity control device includes an oil pump and a first control valve; the oil return capacity of the oil return quantity control device is controlled according to the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, including: determining a target oil return speed according to the oil return demand and a preset oil return duration; if the first control valve can achieve the target oil return speed at its maximum opening under the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, then the oil return quantity is controlled according to the target oil return speed and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor. The pressure difference between the discharge pressure and the suction pressure of the scroll compressor controls the opening of the first control valve; if the first control valve cannot reach the target oil return speed at its maximum opening under the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, then the first control valve is controlled to be at its maximum opening, and the speed of the oil pump is controlled according to the difference between the target oil return speed and the maximum opening oil return speed; wherein, the maximum opening oil return speed is: the oil return speed of the first control valve at its maximum opening when the oil pump is not running under the pressure difference between the discharge pressure and the suction pressure of the scroll compressor.

[0026] In the above implementation method, the first control valve is used first for oil return control. Only when the oil return demand cannot be met even at the maximum opening of the first control valve is the oil pump used for oil return control. In this way, the oil return demand of the scroll compressor can be met while minimizing the pumping volume of the oil pump and reducing the excessive energy consumption of the compressor due to the oil pump pumping.

[0027] Furthermore, the compressor lubrication system also includes a filter, which is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor.

[0028] In the above implementation method, by setting a filter, impurities in the refrigeration oil in the compressor lubrication system can be filtered out, so that the compressor lubrication system has a good cleanliness.

[0029] Furthermore, the compressor lubrication system also includes a third flow detection sensor, which is disposed between the filter and the oil inlet of the scroll compressor; the method further includes: acquiring the flow data detected by the third flow detection sensor; when the difference between the flow data detected by the third flow detection sensor and a preset calibration value exceeds a preset difference range, reminding the user to replace the filter according to a preset prompt method.

[0030] Under the same oil return capacity, the detection value of the third flow sensor will differ significantly depending on whether the filter is clogged and the filter is not clogged. Therefore, if the difference between the flow data detected by the third flow sensor and the preset calibration value exceeds a preset range, it indicates that the filter is severely clogged. Following the above implementation method, a timely filter replacement reminder can be issued, thereby reducing the risk of compressor lubrication system blockage caused by filter clogging.

[0031] Furthermore, the compressor lubrication system also includes a first pressure sensor and a second pressure sensor, the first pressure sensor being disposed at the front end of the filter and the second pressure sensor being disposed at the rear end of the filter; the method further includes: acquiring the detection values ​​of the first pressure sensor and the second pressure sensor, and determining the pressure difference across the filter based on the detection values ​​of the first pressure sensor and the second pressure sensor; when the pressure difference exceeds a preset pressure difference threshold, providing a filter replacement reminder according to a preset prompt method.

[0032] Once the filter becomes clogged, the pressure difference across the filter will increase, and the more severe the clogging, the greater the pressure difference. In the above implementation, by setting a first pressure sensor and a second pressure sensor, and determining the pressure difference across the filter based on the detection values ​​of the first and second pressure sensors, the degree of filter clogging can be accurately determined. This allows for timely filter replacement reminders when the pressure difference exceeds a preset threshold, thereby reducing the risk of compressor lubrication system blockage caused by filter clogging.

[0033] Furthermore, the compressor lubrication system also includes an oil temperature control device; the oil temperature control device is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor; the method further includes: acquiring the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that enables the scroll compressor to operate at a target efficiency; when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold, controlling the oil temperature control device to cool the refrigeration oil flowing through the oil temperature control device.

[0034] In scroll compressors, overheating of the refrigerant oil alters the suction conditions, increasing the suction temperature and reducing the compressor's volumetric efficiency. Simultaneously, overheating causes a decrease in oil viscosity, which can worsen the seal between the scroll plates, potentially increasing internal leakage and further reducing volumetric efficiency. Furthermore, the reduced oil viscosity decreases the thickness of the lubricating film on the scroll plate surface, affecting lubrication and potentially leading to friction, increased power consumption, reduced performance, and even scroll plate damage due to friction and high temperatures. Additionally, overheated refrigerant oil entering the scroll plate reduces its cooling effect, further decreasing the compressor's volumetric efficiency. To address these issues, the aforementioned implementation method obtains the current oil temperature and the target oil temperature of the scroll compressor to determine whether the scroll compressor is experiencing refrigerant oil overheating (the difference between the current oil temperature and the target oil temperature exceeding a preset temperature difference threshold is considered as refrigerant oil overheating). When this occurs, the oil temperature control device is promptly activated to cool the refrigerant oil flowing through it. This timely cooling of the overheated refrigerant oil reduces the probability of the aforementioned problems and mitigates the risk of reduced volumetric efficiency of the scroll compressor.

[0035] Furthermore, the compressor lubrication system further includes: a first temperature sensor, disposed inside the scroll compressor, or disposed at the outlet of the scroll compressor, or disposed at the inlet of the oil-gas separator, or disposed at the oil outlet of the oil-gas separator; obtaining the current oil temperature of the scroll compressor includes: obtaining the temperature value detected by the first temperature sensor; the temperature value detected by the first temperature sensor represents the current oil temperature of the scroll compressor.

[0036] In the above implementation, by setting a first temperature sensor inside the scroll compressor, at the outlet of the scroll compressor, at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator, the temperature value detected by the first temperature sensor at these locations can accurately represent the current oil temperature of the scroll compressor. Therefore, based on the above method, the current oil temperature of the scroll compressor can be easily and accurately obtained, improving the reliability of the solution.

[0037] Furthermore, obtaining the target oil temperature of the scroll compressor includes: obtaining the current operating condition of the scroll compressor; and determining the target oil temperature corresponding to the current operating condition based on the current operating condition.

[0038] In the above implementation, by setting corresponding target oil temperatures for different operating conditions, the refrigeration oil can be cooled to the oil temperature required for different operating conditions when cooling the refrigeration oil. This allows the scroll compressor to use refrigeration oil at the appropriate oil temperature according to the needs of the current operating condition, thereby achieving better volumetric efficiency and mechanical efficiency.

[0039] Furthermore, the outlet of the oil-gas separator is configured to connect to the air conditioning system to introduce the refrigerant output by the scroll compressor into the air conditioning system; the operating conditions of the scroll compressor include: a first operating condition for cooperating with the air conditioning system for cooling, and a second operating condition for cooperating with the air conditioning system for heating.

[0040] In the above implementation, by setting a first operating condition for cooperating with the air conditioning system for cooling and a second operating condition for cooperating with the air conditioning system for heating, the compressor lubrication system can be used in conjunction with the air conditioning system to achieve good coordination for different operating modes of the air conditioning system. This allows the scroll compressor to enable the air conditioning system to achieve better cooling or heating effects with the same power consumption.

[0041] Furthermore, controlling the oil temperature control device to cool the refrigeration oil flowing through the oil temperature control device includes: obtaining the oil return speed of the refrigeration oil in the compressor lubrication system; and controlling the cooling intensity of the oil temperature control device based on the oil return speed and the difference between the current oil temperature and the target oil temperature, so as to cool the refrigeration oil flowing through the oil temperature control device.

[0042] In the above implementation method, by controlling the cooling intensity of the oil temperature control device according to the oil return speed and the difference between the current oil temperature and the target oil temperature, the refrigeration oil can be cooled with an appropriate cooling intensity, thereby effectively reducing the refrigeration oil temperature to the required range.

[0043] Furthermore, the outlet of the oil-gas separator is configured to connect to an air conditioning system to introduce the refrigerant output by the scroll compressor into the air conditioning system; the air conditioning system includes a condenser; the oil temperature control device includes: a first pipe for refrigerant flow and a second control valve; the second control valve is disposed on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the suction port of the scroll compressor; controlling the cooling intensity of the oil temperature control device according to the oil return speed and the difference between the current oil temperature and the target oil temperature includes: controlling the opening degree of the second control valve according to the oil return speed and the difference between the current oil temperature and the target oil temperature.

[0044] In the above implementation, the refrigerant in the air conditioning system is reused through the first pipe, eliminating the need for an additional refrigeration unit and reducing costs. Simultaneously, by controlling the opening of the second control valve, the amount of refrigerant flowing into the first pipe can be effectively managed, thereby achieving effective control of the cooling intensity of the oil temperature control device. The control method is simple, reliable, and easy to implement in industrial production.

[0045] Furthermore, before controlling the opening of the second control valve based on the oil return speed, the difference between the current oil temperature and the target oil temperature, the method further includes: obtaining the first cooling demand of the refrigerant in the air conditioning system; determining the remaining amount of refrigerant available for the oil temperature control device based on the total amount of refrigerant and the first cooling demand of the refrigerant; controlling the opening of the second control valve based on the oil return speed, the difference between the current oil temperature and the target oil temperature, including: determining the second cooling demand of the refrigerant based on the oil return speed, the difference between the current oil temperature and the target oil temperature; controlling the opening of the second control valve based on the remaining refrigerant when the second cooling demand is greater than or equal to the remaining refrigerant; and controlling the opening of the second control valve based on the second cooling demand when the second cooling demand is less than the remaining refrigerant.

[0046] By implementing the above method, when using refrigerant in the air conditioning system to cool the refrigeration oil, priority can be given to ensuring the cooling needs of the air conditioning system itself. This achieves the cooling of the refrigeration oil without affecting the user experience as much as possible, and realizes dynamic coupling with the load of the air conditioning system.

[0047] Furthermore, the compressor lubrication system further includes: a second temperature sensor, disposed between the oil temperature control device and the oil inlet of the scroll compressor; the method further includes: acquiring the temperature value detected by the second temperature sensor; when the temperature value detected by the second temperature sensor is lower than a preset first stop temperature, controlling the oil temperature control device to stop cooling the refrigeration oil flowing through the oil temperature control device.

[0048] In the above implementation, by setting the second temperature sensor, the oil temperature input to the scroll compressor after cooling can be accurately detected. When the temperature value detected by the second temperature sensor is lower than the preset first stop temperature, it indicates that the oil temperature has been successfully reduced to the temperature required by the scroll compressor. Therefore, at this time, the cooling treatment of the refrigeration oil flowing through the oil temperature control device is stopped, which can save energy and also avoid the oil temperature being too low, thus affecting the subsequent separation effect of refrigeration oil and refrigerant, and causing too much refrigeration oil to enter the air conditioning system and affect the heat exchange of the air conditioning system.

[0049] Furthermore, the method further includes: before starting the scroll compressor, acquiring the ambient temperature and the oil temperature of the refrigeration oil in the compressor lubrication system; determining whether the ambient temperature is lower than or equal to a preset ambient temperature threshold and whether the oil temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold; and, if the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigeration oil is lower than or equal to the preset start-up oil temperature threshold, controlling the oil temperature control device to heat the refrigeration oil flowing through the oil temperature control device.

[0050] In low-temperature environments, the viscosity of refrigeration oil increases and its fluidity decreases. This can lead to ineffective lubrication of the various components of a scroll compressor, increasing friction and wear, and potentially causing start-up failure or unstable operation. In the aforementioned solution, when the ambient temperature is below or equal to a preset threshold and the refrigeration oil temperature is below or equal to a preset start-up oil temperature threshold, the oil temperature control device heats the refrigeration oil flowing through it. This prevents the oil temperature from becoming too low during compressor start-up, thereby improving the start-up success rate and operational stability of the scroll compressor.

[0051] Furthermore, the method further includes starting the scroll compressor when the temperature of the refrigeration oil is higher than the preset start-up oil temperature threshold.

[0052] This application embodiment also provides an oil return control device for a compressor lubrication system. The compressor lubrication system includes: a scroll compressor; an oil-gas separator connected to the outlet of the scroll compressor; the oil outlet of the oil-gas separator is connected to the oil inlet of the scroll compressor via an oil return quantity control device; the oil return control device includes: a first acquisition module for acquiring the operating parameters of the scroll compressor; the operating parameters include the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor; and a first control module for determining the current oil return demand of the scroll compressor based on the operating parameters of the scroll compressor, and controlling the oil return capacity of the oil return quantity control device based on the oil return demand and the pressure difference between the discharge pressure and suction pressure of the scroll compressor.

[0053] In the above implementation scheme, the current oil return demand of the scroll compressor is determined based on its discharge temperature, suction temperature, discharge pressure, and suction pressure. Then, the oil return capacity of the oil return control device is controlled based on the oil return demand and the pressure difference between the discharge and suction pressures of the scroll compressor. Since the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor reflect its operating status and thus its demand for refrigerant oil, dynamic oil return control based on the current oil return demand of the scroll compressor can be achieved, thereby reducing the risk of excessive or insufficient refrigerant oil in the scroll compressor. Simultaneously, dynamic oil return control ensures that the refrigerant oil level in the scroll compressor remains within its required range, thereby improving the operating efficiency of the scroll compressor.

[0054] This application embodiment also provides a control system, including: a controller and a compressor lubrication system; the compressor lubrication system includes: a scroll compressor, an oil-gas separator connected to the outlet of the scroll compressor, the oil outlet of the oil-gas separator being connected to the oil inlet of the scroll compressor via an oil return volume control device; the controller is connected to the scroll compressor and the oil return volume control device; the controller is used for the oil return control method of any of the above-described compressor lubrication systems.

[0055] This application also provides a computer-readable storage medium storing one or more programs that can be executed by one or more processors to implement the oil return control method of any of the above-described compressor lubrication systems. Attached Figure Description

[0056] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. The following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of the basic structure of a compressor lubrication system provided in Embodiment 1 of this application;

[0058] Figure 2 A schematic flowchart of a return oil control method provided in Embodiment 1 of this application;

[0059] Figure 3 This is a schematic diagram of the structure of a compressor lubrication system with a second flow detection sensor provided in Embodiment 1 of this application;

[0060] Figure 4 This is a schematic diagram of a compressor lubrication system with an oil level detection device provided in Embodiment 1 of this application;

[0061] Figure 5 This is a schematic diagram of a structure applied in an air conditioning system, provided in Embodiment 1 of this application;

[0062] Figure 6 This is a schematic diagram of a compressor lubrication system including a first control valve, which is provided in Embodiment 1 of this application;

[0063] Figure 7 A schematic diagram of a compressor lubrication system including an oil pump, provided in Embodiment 1 of this application, for an oil return volume control device;

[0064] Figure 8 A schematic diagram of a compressor lubrication system including an oil pump and a first control valve, provided in Embodiment 1 of this application;

[0065] Figure 9 This is a schematic diagram of a compressor lubrication system including a first flow detection sensor, provided in Embodiment 1 of this application;

[0066] Figure 10 This is a schematic diagram of a compressor lubrication system with an oil collection tank provided in Embodiment 1 of this application;

[0067] Figure 11 This is a schematic diagram of a compressor lubrication system equipped with a filter, provided in Embodiment 1 of this application;

[0068] Figure 12 This is a schematic diagram of a compressor lubrication system equipped with a third flow detection sensor, provided in Embodiment 1 of this application;

[0069] Figure 13 This is a schematic diagram of a compressor lubrication system including a first pressure sensor and a second pressure sensor, provided in Embodiment 1 of this application.

[0070] Figure 14 This is a schematic diagram of the basic structure of a compressor lubrication system provided in Embodiment 2 of this application;

[0071] Figure 15 This is a schematic flowchart of a return oil control method provided in Embodiment 2 of this application;

[0072] Figure 16 This is a schematic diagram of a compressor lubrication system equipped with a first temperature sensor, provided in Embodiment 2 of this application;

[0073] Figure 17 This is a schematic diagram of a structure applied in an air conditioning system, provided in Embodiment 2 of this application;

[0074] Figure 18 This is a schematic diagram of the structure of a compressor lubrication system for achieving refrigeration oil cooling using refrigerant in a reusable air conditioning system, provided in Embodiment 2 of this application.

[0075] Figure 19 This is a schematic diagram of the basic structure of a compressor lubrication system that is simultaneously equipped with an oil return volume control device and an oil temperature regulation device, as provided in Embodiment 2 of this application.

[0076] Figure 20 This application provides a system structure that can simultaneously adjust the amount of air conditioning refrigerant and the amount of refrigerant that the oil temperature control device can use, as provided in Embodiment 2 of this application.

[0077] Figure 21 This is a schematic diagram of a compressor lubrication system equipped with a second temperature sensor, provided in Embodiment 2 of this application;

[0078] Figure 22 This is a schematic diagram of a compressor lubrication system with an oil collection tank provided in Embodiment 2 of this application;

[0079] Figure 23 This is a schematic diagram of a compressor lubrication system equipped with a filter, provided in Embodiment 2 of this application;

[0080] Figure 24 This is a schematic diagram of a compressor lubrication system equipped with a third flow detection sensor, provided in Embodiment 2 of this application;

[0081] Figure 25 This is a schematic diagram of a compressor lubrication system including a first pressure sensor and a second pressure sensor, provided in Embodiment 2 of this application.

[0082] Figure 26 A specific system structure diagram is provided for an embodiment of this application;

[0083] Figure 27 This is a schematic diagram of the structure of the first type of oil return control device provided in the embodiments of this application;

[0084] Figure 28 This is a schematic diagram of the structure of the second type of oil return control device provided in the embodiments of this application. Detailed Implementation

[0085] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0086] Example 1:

[0087] When a scroll compressor is running, excessive refrigerant oil can easily lead to liquid slugging and damage. Conversely, insufficient refrigerant oil can cause inadequate sealing, resulting in internal leaks and, in severe cases, even dry running and burnout. Furthermore, both excessive and insufficient refrigerant oil levels can negatively impact the compressor's operating efficiency. Therefore, to ensure the normal operation of the scroll compressor and improve its efficiency, this embodiment implements oil return control to maintain the refrigerant oil level within the compressor's required range.

[0088] Therefore, this application provides a method for controlling the oil return of a compressor lubrication system. Wherein, as... Figure 1 As shown, the compressor lubrication system includes: a scroll compressor, an oil-gas separator connected to the outlet of the scroll compressor, and the oil outlet of the oil-gas separator connected to the oil inlet of the scroll compressor through an oil return control device.

[0089] In the embodiments of this application, such as Figure 2 As shown, the oil return control method includes:

[0090] S201: Obtain the operating parameters of the scroll compressor.

[0091] In this embodiment, the operating parameters of the scroll compressor may include the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor. Furthermore, in an optional embodiment of this application, the operating parameters may also include the rotational speed and / or power consumption of the scroll compressor.

[0092] For example, the operating parameters of a scroll compressor may include only the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor; for another example, the operating parameters of a scroll compressor may include the discharge temperature, suction temperature, discharge pressure, suction pressure, and speed of the scroll compressor; for yet another example, the operating parameters of a scroll compressor may include the discharge temperature, suction temperature, discharge pressure, suction pressure, and power consumption of the scroll compressor.

[0093] The above are some optional exemplary embodiments provided in the embodiments of this application. In addition to the above embodiments, the operating parameters of the scroll compressor obtained may also include other parameters, as long as the parameter can reflect the operating status of the scroll compressor and is affected by the amount of refrigeration oil.

[0094] In this embodiment of the application, a temperature sensor and a pressure sensor can be installed at the outlet of the scroll compressor, so that the exhaust temperature of the scroll compressor can be obtained through the temperature sensor, and the exhaust pressure of the scroll compressor can be obtained through the pressure sensor.

[0095] In this embodiment of the application, a temperature sensor and a pressure sensor can also be installed at the suction port of the scroll compressor, so that the suction temperature of the scroll compressor can be obtained through the temperature sensor, and the suction pressure of the scroll compressor can be obtained through the pressure sensor.

[0096] In this embodiment of the application, a tachometer or Hall sensor can be installed in the scroll compressor to obtain the rotational speed of the scroll compressor.

[0097] In this embodiment of the application, a power meter or electricity meter can be installed in the scroll compressor to obtain the power consumption of the scroll compressor through the value detected by the power meter or electricity meter.

[0098] S202: Determine the current oil return demand of the scroll compressor based on its operating parameters.

[0099] In one feasible implementation of the embodiments of this application, such as Figure 3 As shown, the compressor lubrication system also includes a second flow detection sensor. This second flow detection sensor can be installed at the oil outlet of the oil-gas separator (or inside the oil-gas separator, or, if an oil collection chamber exists, inside the oil collection chamber). This allows for the determination of the oil output of the scroll compressor based on the oil output and oil-gas separation rate detected by the second flow detection sensor. Alternatively, as... Figure 4 As shown, the compressor lubrication system also includes an oil level detection device, which is installed on the scroll compressor, allowing the amount of refrigerant oil inside the scroll compressor to be determined. Optionally, the oil level detection device can be implemented using an oil level gauge.

[0100] Since the operating parameters of a scroll compressor, such as discharge temperature, suction temperature, discharge pressure, suction pressure, speed, and power consumption, can reflect the compressor's operating status, and thus the amount of refrigerant oil required during operation, this feasible embodiment can pre-construct the correspondence between different operating parameters and different refrigerant oil requirements when the scroll compressor is at its target operating efficiency through experiments. This correspondence must be constructed in advance to ensure that the required amount of refrigerant oil is sufficient to guarantee the scroll compressor's sealing.

[0101] In the embodiments of this application, the target operating efficiency refers to the required operating efficiency of the scroll compressor. For example, the target operating efficiency may be the optimal operating efficiency of the scroll compressor.

[0102] In this feasible embodiment, the detection value of the second flow detection sensor can be obtained, and the amount of refrigerant oil in the scroll compressor can be determined based on the amount of refrigerant oil in the scroll compressor, the detection value of the second flow detection sensor, and the oil-gas separation rate of the oil-gas separator. Furthermore, the correspondence between the operating parameters of the scroll compressor at the target operating efficiency and the refrigerant oil demand can be obtained, and then the current refrigerant oil demand of the scroll compressor can be determined from this correspondence based on the operating parameters of the scroll compressor. Then, the difference between the current refrigerant oil demand of the scroll compressor and the amount of refrigerant oil in the scroll compressor is calculated to obtain the current oil return demand of the scroll compressor.

[0103] The amount of refrigerant oil in the scroll compressor refers to the amount of refrigerant oil recorded in the scroll compressor at the time of calculating the current amount of refrigerant oil in the compressor. Alternatively, it can be understood as the amount of refrigerant oil present in the scroll compressor before the current calculation. The amount of refrigerant oil in the scroll compressor can be determined by dividing the value detected by the second flow sensor and the oil-gas separation rate of the oil-gas separator by the amount of refrigerant oil lost from the scroll compressor. Then, the amount of refrigerant oil in the scroll compressor is obtained by subtracting the amount of refrigerant oil lost from the amount of refrigerant oil remaining in the scroll compressor.

[0104] Considering that after oil return control is implemented, some of the refrigerant oil will flow back into the scroll compressor to replenish the refrigerant oil in the scroll compressor, the amount of refrigerant oil flowing back into the scroll compressor can be counted in real time during the above calculation. Then, the amount of refrigerant oil in the scroll compressor can be obtained by adding the amount of refrigerant oil stored in the scroll compressor to the amount of refrigerant oil flowing back into the scroll compressor, and then subtracting the amount of refrigerant oil lost from the scroll compressor.

[0105] In this feasible embodiment, the amount of refrigerant oil in the scroll compressor detected by the oil level detection device can also be obtained, as well as the correspondence between the operating parameters of the scroll compressor at the target operating efficiency and the refrigerant oil demand. Then, based on the operating parameters of the scroll compressor, the current refrigerant oil demand of the scroll compressor can be determined from this correspondence. At this point, the difference between the current refrigerant oil demand of the scroll compressor and the amount of refrigerant oil in the scroll compressor detected by the oil level detection device can be directly calculated to obtain the current oil return demand of the scroll compressor.

[0106] Based on the above methods, the current oil return demand of the scroll compressor can be obtained relatively accurately. This allows the working efficiency of the scroll compressor to be as close as possible to the target operating efficiency after oil return is made according to the oil return demand, thereby improving the working efficiency of the scroll compressor.

[0107] In another feasible implementation, the detection value of the second flow detection sensor can be directly obtained as the oil discharge volume of the scroll compressor, and then the current refrigerant oil demand of the scroll compressor can be estimated based on the oil discharge volume of the scroll compressor.

[0108] In some optional embodiments, considering that the correspondence between operating parameters and refrigerant oil demand may differ when the compressor operates under different conditions and at the target operating efficiency, this optional embodiment can pre-test to obtain the correspondence between operating parameters and refrigerant oil demand when the scroll compressor operates at the target operating efficiency under different conditions. Then, in determining the current oil return demand of the scroll compressor, the current operating condition of the scroll compressor can be obtained first, followed by the target correspondence corresponding to the current operating condition. Then, based on the operating parameters of the scroll compressor, the current refrigerant oil demand of the scroll compressor can be determined from the target correspondence, and finally, the current oil return demand of the scroll compressor can be determined using this current refrigerant oil demand.

[0109] The target correspondence refers to the relationship between the operating parameters and the required amount of refrigeration oil when the scroll compressor is operating at the target efficiency under the current operating conditions.

[0110] In this way, the operating conditions of the scroll compressor are taken into account, so that the amount of refrigerant oil in the scroll compressor after the oil return process meets the requirements of the current operating conditions. This makes the working efficiency of the scroll compressor closer to the optimal efficiency point of the current operating conditions, thereby improving the working efficiency of the scroll compressor.

[0111] In another feasible embodiment of this application, parameters such as the discharge temperature, suction temperature, discharge pressure, and suction pressure of a scroll compressor can reflect the operating status of the compressor, and thus reflect the demand for refrigerant oil. However, under the same operating conditions, the refrigerant oil consumption of a scroll compressor is basically the same. Therefore, to a certain extent, these parameters can reflect both the compressor's operating status and its demand for refrigerant oil return. Therefore, in this feasible embodiment, a second flow detection sensor or oil quantity detection device may not be required. Instead, a pre-constructed relationship between different operating parameters and different refrigerant oil demands can be established when the scroll compressor is at its target operating efficiency. This relationship must be constructed to ensure that the refrigerant oil demand guarantees the normal cooling, lubrication, and sealing functions of the scroll compressor.

[0112] In this way, when the current oil return demand of the scroll compressor is determined from the corresponding relationship based on the operating parameters of the scroll compressor, the corresponding relationship between the operating parameters and the oil return demand when the scroll compressor is at the target operating efficiency can be obtained. Then, the current oil return demand of the scroll compressor can be determined from the corresponding relationship based on the operating parameters of the scroll compressor.

[0113] The above feasible implementation method does not require the installation of a flow detection device to detect the amount of refrigerant oil in the scroll compressor, thus having a lower implementation cost. Furthermore, since the obtained data is the correspondence between the operating parameters of the scroll compressor at the target operating efficiency and the oil return demand, controlling the oil return amount according to the oil return demand determined by this correspondence can also make the scroll compressor operate near the target operating efficiency, thereby improving the working efficiency of the scroll compressor.

[0114] Similarly, considering that the correspondence between operating parameters and oil return demand may differ when the compressor operates under different conditions and at the target operating efficiency, in this optional embodiment, the correspondence between operating parameters and oil return demand can be experimentally obtained beforehand when the scroll compressor operates at the target operating efficiency under different conditions. Then, in determining the current oil return demand of the scroll compressor, the current operating condition of the scroll compressor can be obtained first, followed by the target correspondence corresponding to the current operating condition. Then, based on the operating parameters of the scroll compressor, the current oil return demand of the scroll compressor can be determined from the target correspondence. Here, the target correspondence refers to the correspondence between operating parameters and oil return demand when the scroll compressor operates at the target efficiency under the current operating condition. This takes into account the operating condition of the scroll compressor, ensuring that the amount of refrigerant oil in the scroll compressor after oil return meets the requirements of the current operating condition, thus making the working efficiency of the scroll compressor closer to the optimal efficiency point of the current operating condition and improving the working efficiency of the scroll compressor.

[0115] In this embodiment, the scroll compressor can be used in an air conditioning system to provide a power source for the refrigerant circulation of the air conditioning system. For example, such as... Figure 5 As shown, in this embodiment of the compressor lubrication system, the outlet of the oil-gas separator can be configured to connect to an air conditioning system to introduce the refrigerant output from the scroll compressor into the air conditioning system. Simultaneously, the refrigerant outlet of the air conditioning system's piping can be connected to the suction port of the scroll compressor to achieve refrigerant circulation.

[0116] In this embodiment, the operating state of the scroll compressor is related to the state of the air conditioning system it operates with. For example, if the air conditioning system needs to cool or heat, but the difference between the ambient temperature and the set temperature of the air conditioning system is large, then the demand for refrigerant in the air conditioning system is relatively large, and the scroll compressor needs to operate under a large load. If the difference between the ambient temperature and the set temperature of the air conditioning system is small, then the demand for refrigerant in the air conditioning system is small, and the scroll compressor needs to operate under a small load. Therefore, in this embodiment, the operating conditions of the scroll compressor can include a third operating condition for achieving the aforementioned large load and a fourth operating condition for achieving the aforementioned small load. A load threshold can be set, where loads exceeding the threshold are referred to as large loads, and loads not exceeding the threshold are referred to as small loads. In this embodiment, when constructing the correspondence between operating parameters and oil return demand, compared to the fourth operating condition, under the same operating parameters, the oil return demand corresponding to the third operating condition is higher than that corresponding to the fourth operating condition. Similarly, when establishing the correspondence between operating parameters and refrigeration oil demand, compared with the fourth operating condition, under the same operating parameters, the refrigeration oil demand for the third operating condition is higher than that for the fourth operating condition.

[0117] In this embodiment, the operating state of the scroll compressor is also related to its own temperature. When the temperature of the scroll compressor exceeds a set limit, the scroll compressor will be in a dangerous state, requiring cooling. Therefore, in this embodiment, the operating condition of the scroll compressor may also include an ultra-high temperature operating condition. For example, a critical operating temperature value can be preset. When the internal temperature of the scroll compressor or the exhaust temperature of the scroll compressor exceeds this critical operating temperature value, the scroll compressor is determined to be in an ultra-high temperature operating condition.

[0118] In this embodiment, when constructing the correspondence between operating parameters and refrigeration oil demand, under the same operating parameters, the refrigeration oil demand corresponding to the ultra-high temperature operating condition is higher than that corresponding to the third operating condition. Similarly, when constructing the correspondence between operating parameters and return oil demand, under the same operating parameters, the return oil demand corresponding to the ultra-high temperature operating condition is higher than that corresponding to the third operating condition.

[0119] In this embodiment of the application, when obtaining the current operating condition of the scroll compressor, it can be first determined whether the scroll compressor is in an ultra-high temperature operating condition. If the scroll compressor is not in an ultra-high temperature operating condition, it can then be determined whether the scroll compressor is in a third or fourth operating condition.

[0120] S203: The oil return capacity of the oil return controller is controlled based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor.

[0121] In the embodiments of this application, such as Figure 6 As shown, the oil return quantity control device may include a first control valve. At this time, step S203 may include: controlling the opening degree of the first control valve based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor.

[0122] In this embodiment, the oil return time can be preset, so that the oil return speed can be determined based on the ratio of the oil return demand and the preset oil return time, and then the opening of the first control valve can be controlled based on the pressure difference between the exhaust pressure and the intake pressure of the scroll compressor and the oil return speed.

[0123] The pressure difference between the discharge and suction pressures of a scroll compressor provides the driving force for the flow of refrigeration oil in the compressor's lubrication system; the greater the pressure difference, the stronger the driving force. Conversely, the larger the opening of the first control valve, the greater the oil return speed under the same pressure difference. Therefore, the correspondence between the pressure difference between the discharge and suction pressures of the scroll compressor, the oil return speed, and the opening of the first control valve can be pre-established, and the opening of the first control valve can be determined and controlled based on this correspondence.

[0124] In the embodiments of this application, such as Figure 7 As shown, the oil return volume control device may include an oil pump. In this case, step S203 may include: controlling the oil pump speed based on the oil return demand and the pressure difference between the discharge pressure and suction pressure of the scroll compressor.

[0125] In this embodiment, the oil return time can be preset, allowing the target oil return speed to be determined based on the quotient of the required oil return volume and the preset oil return time. The oil pump speed is then controlled based on the pressure difference between the discharge and suction pressures of the scroll compressor and the target oil return speed. Specifically, a basic oil return speed can be determined based on the pressure difference between the discharge and suction pressures of the scroll compressor and the pipe diameter. Then, based on the target oil return speed and this basic oil return speed, the missing oil return speed can be determined. The oil pump speed is then controlled to compensate for this missing oil return speed, ensuring that the final oil return speed reaches the target oil return speed. This allows the required amount of refrigerant oil to be supplied to the scroll compressor within the preset oil return time.

[0126] To achieve accurate oil return control, in this embodiment, the oil return speed corresponding to different pressure differences between the discharge pressure and suction pressure of the scroll compressor in the compressor lubrication system can be predetermined through experiments and simulations, and the correspondence between the pressure difference and the oil return speed can be recorded. Similarly, the oil return speed that can be generated at different oil pump speeds can be predetermined through experiments and simulations, and the correspondence between the oil pump speed and the oil return speed can also be recorded. During oil return control, a basic oil return speed can be determined first based on the correspondence between the pressure difference and the oil return speed. Then, based on the missing oil return speed and the correspondence between the oil pump speed and the oil return speed, the required oil pump speed can be determined, and the oil pump can be controlled to operate at that speed.

[0127] In the embodiments of this application, such as Figure 8 As shown, the oil return volume control device can include both an oil pump and a first control valve. In one optional embodiment, oil return control can be prioritized based on the first control valve. If the required oil return speed is not met even at the maximum opening of the first control valve, then the oil pump can be used for control.

[0128] For example, the target oil return speed can be determined based on the oil return demand and the preset oil return duration. If the first control valve can achieve the target oil return speed at its maximum opening under the pressure difference between the discharge and suction pressures of the scroll compressor, then the opening of the first control valve is controlled according to the target oil return speed and the pressure difference between the discharge and suction pressures of the scroll compressor. If the first control valve cannot achieve the target oil return speed at its maximum opening under the pressure difference between the discharge and suction pressures of the scroll compressor, then the first control valve is controlled to be at its maximum opening, and the oil pump speed is controlled according to the difference between the target oil return speed and the maximum opening oil return speed. The maximum opening oil return speed is defined as the oil return speed at its maximum opening when the oil pump is not running and the first control valve is at its maximum opening under the pressure difference between the discharge and suction pressures of the scroll compressor.

[0129] In this optional embodiment, the return oil speed corresponding to different pressure differences between the discharge and suction pressures of the scroll compressor in the compressor lubrication system, and the different opening degrees of the first control valve, can be predetermined through experiments and simulations, and the correspondence between the pressure difference, opening degree, and return oil speed can be recorded. Similarly, the return oil speed generated at different oil pump speeds can be predetermined through experiments and simulations, and the correspondence between the oil pump speed and return oil speed can also be recorded. When controlling the return oil speed, based on the correspondence between the pressure difference, opening degree, and return oil speed, it can be determined whether the first control valve can achieve the target return oil speed at its maximum opening under the pressure difference between the discharge and suction pressures of the scroll compressor. If it can, the opening degree of the first control valve is determined directly from the correspondence between the pressure difference, opening degree, and return oil speed, based on the target return oil speed and the pressure difference between the discharge and suction pressures of the scroll compressor, and the first control valve is then controlled to open to that opening degree. If the first control valve cannot reach the target oil return speed at its maximum opening, then the first control valve is controlled to be at its maximum opening, and the difference between the target oil return speed and the maximum opening oil return speed is calculated to obtain the first difference speed. Based on this first difference speed, the oil pump speed is determined from the correspondence between the oil pump speed and the oil return speed, and the oil pump is controlled to operate at this oil pump speed. The maximum opening oil return speed can be determined from the pressure difference between the discharge pressure and suction pressure of the scroll compressor and the maximum opening of the first control valve, based on the correspondence between this pressure difference, opening, and oil return speed.

[0130] In this way, the first control valve is used first for oil return control. Only when the oil return demand cannot be met even at the maximum opening of the first control valve is the oil pump used for oil return control. This way, the oil return demand of the scroll compressor can be met while minimizing the pumping volume of the oil pump and reducing the excessive energy consumption of the compressor due to the oil pump pumping.

[0131] Understandable, for Figure 8 The scheme shown can also be implemented in other ways for oil return control. For example, the oil pump speed can be set to operate at its optimal efficiency point. Then, based on the oil pump speed, the pressure difference between the discharge and suction pressures of the scroll compressor, and the target oil return speed, the opening degree of the first control valve can be determined, and the first control valve can be controlled to open to that degree. If the required opening degree of the first control valve exceeds its maximum opening degree, then the first control valve can be controlled to open to the maximum opening degree, and the oil pump speed can be increased so that the oil return speed can reach the target oil return speed.

[0132] For example, the correspondence between different pressure differences between the discharge and suction pressures of the scroll compressor, different opening degrees of the first control valve, and the oil return speed at the speed when the oil pump operates at its optimal efficiency point can be determined in advance through experiments or simulations. Then, based on the target oil return speed and the pressure difference between the discharge and suction pressures of the scroll compressor, the opening degree of the first control valve is determined from this correspondence. The oil pump is then controlled to operate at the speed at its optimal efficiency point, and the first control valve is controlled to open to the determined opening degree.

[0133] Furthermore, the correspondence between different oil pump speeds and return oil speeds at the maximum opening of the first control valve, as well as the correspondence between different pressure differences and return oil speeds at the maximum opening of the first control valve, can be determined in advance through experiments or simulations. When the target return oil speed exceeds the maximum return oil speed in the correspondence between different pressure differences between the discharge and suction pressures of the scroll compressor and different openings of the first control valve at the speed when the oil pump is operating at its optimal efficiency point, it means that the required opening of the first control valve exceeds its maximum opening. At this point, the basic return oil speed that the pressure difference between the discharge and suction pressures of the scroll compressor can bring can be determined from the correspondence between the pressure difference and the return oil speed. Then, the difference between the target return oil speed and this basic return oil speed is calculated to obtain the second difference speed. Based on this second difference speed, the oil pump speed is determined from the correspondence between the oil pump speed and the return oil speed, and then the oil pump is controlled to operate at this oil pump speed.

[0134] In this embodiment, the oil return duration can be set according to the urgency of the oil return of the scroll compressor, for example, it can be set to 1 second. The higher the urgency of the oil return of the scroll compressor, the shorter the oil return duration can be set.

[0135] In the embodiments of this application, the first control valve may be implemented using a controlled valve such as a controlled throttle valve or an electronic expansion valve, but this is not a limitation.

[0136] In the embodiments of this application, such as Figure 9 As shown, the compressor lubrication system may also include a first flow detection sensor. The first flow detection sensor is located between the oil outlet of the oil-gas separator and the oil return flow controller, or between the oil return flow controller and the oil inlet of the scroll compressor.

[0137] At this point, the flow data detected by the first flow sensor can be acquired, and the actual oil return volume of the scroll compressor can be determined based on the flow data. Then, when the actual oil return volume reaches the current oil return demand of the scroll compressor, the oil return volume control device is turned off, or its oil return capacity is adjusted to match the oil output per unit time at the scroll compressor's oil outlet. This method of turning off the oil return volume control device or adjusting its capacity to match the oil output per unit time at the scroll compressor's oil outlet reduces the risk of excessive refrigerant oil in the scroll compressor and lowers its operating load.

[0138] Optionally, the oil return capacity of the oil return control device can be adjusted to be the same as the oil output per unit time at the oil outlet of the scroll compressor, thereby keeping the amount of refrigerant oil in the scroll compressor at a suitable level and improving the operating efficiency of the scroll compressor.

[0139] In the embodiments of this application, such as Figure 10 As shown, the compressor lubrication system may also include an oil collection tank. This oil collection tank can be located between the oil outlet of the oil-gas separator and the oil return volume control device. In this case, a first flow detection sensor can be installed after the oil collection tank so that its detection value accurately represents the actual amount of refrigerant oil returned. Therefore, when the actual oil return volume reaches the current oil return demand of the scroll compressor, the oil return volume control device is shut off, or its return capacity is adjusted to match the oil output per unit time at the scroll compressor's oil outlet. This reduces the risk of excessive refrigerant oil in the scroll compressor and lowers its operating load.

[0140] In the embodiments of this application, such as Figure 11 As shown, the compressor lubrication system may also include a filter. The filter can be installed between the oil outlet of the oil-gas separator and the oil return flow control device, or between the oil return flow control device and the oil inlet of the scroll compressor. By installing a filter, impurities in the refrigerant oil within the compressor lubrication system can be filtered, ensuring a high level of cleanliness in the compressor lubrication system.

[0141] In the embodiments of this application, such as Figure 12 As shown, the compressor lubrication system may also include a third flow detection sensor. This third flow detection sensor can be located between the filter outlet and the scroll compressor inlet.

[0142] At this time, the flow data detected by the third flow detection sensor can be obtained, and when the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds the preset difference range, a filter replacement reminder will be given according to the preset prompt method.

[0143] Under the same oil return capacity, the detection value of the third flow sensor will differ significantly depending on whether the filter is clogged and the filter is not clogged. Therefore, if the difference between the flow data detected by the third flow sensor and the preset calibration value exceeds a preset range, it indicates that the filter is severely clogged. Following the implementation method described above, a timely filter replacement reminder can be issued, thereby reducing the risk of compressor lubrication system blockage caused by filter clogging.

[0144] In the embodiments of this application, such as Figure 13 As shown, the compressor lubrication system may also include a first pressure sensor and a second pressure sensor, with the first pressure sensor located at the front end of the filter and the second pressure sensor located at the rear end of the filter.

[0145] At this point, the detection values ​​from the first and second pressure sensors can be obtained, and the pressure difference across the filter can be determined based on these values. If the pressure difference exceeds a preset threshold, a filter replacement reminder will be issued according to a preset prompt.

[0146] Considering that once the filter becomes clogged, the pressure difference across the filter will increase, and the more severe the clogging, the greater the pressure difference. Therefore, by setting up a first pressure sensor and a second pressure sensor, and determining the pressure difference across the filter based on the detection values ​​of the first and second pressure sensors, the degree of filter clogging can be accurately determined. This allows for timely filter replacement reminders when the pressure difference exceeds a preset threshold, thereby reducing the risk of compressor lubrication system blockage caused by filter clogging.

[0147] In this application embodiment, the preset prompting method for filter replacement reminder may include, but is not limited to, at least one of the following: reminding via a preset alarm light, reminding via a preset speaker; displaying alarm information on a preset display, such as displaying alarm information on a vehicle display screen; reminding via sending alarm information to a preset terminal device, such as by pre-setting user contact information and then sending alarm information to a terminal with that contact information.

[0148] The oil return control method for a compressor lubrication system provided in this application determines the current oil return demand of the scroll compressor based on its discharge temperature, suction temperature, discharge pressure, and suction pressure. Then, based on the oil return demand and the pressure difference between the discharge and suction pressures of the scroll compressor, the oil return capacity of the oil return control device is controlled. Since the operating parameters of the scroll compressor, such as discharge temperature, suction temperature, discharge pressure, and suction pressure, reflect the compressor's operating status and thus its demand for refrigerant oil, dynamic oil return control based on the current oil return demand of the scroll compressor can be achieved, thereby reducing the risk of excessive or insufficient refrigerant oil in the scroll compressor. Simultaneously, dynamic oil return control ensures that the refrigerant oil level in the scroll compressor remains within its required range, thereby improving the operating efficiency of the scroll compressor.

[0149] Example 2:

[0150] In scroll compressors, overheating of the refrigerant oil alters the suction state, increasing the suction temperature and reducing the compressor's volumetric efficiency. Simultaneously, overheating reduces the oil's viscosity, leading to poorer sealing between the scroll plates, potentially increasing internal leakage and further reducing volumetric efficiency. Furthermore, decreased oil viscosity reduces the thickness of the lubricating film on the scroll plate surface, affecting lubrication and potentially causing friction, increasing power consumption, reducing performance, and even damaging the scroll plate due to high temperatures. Additionally, overheated oil entering the scroll plate reduces its cooling effect, further decreasing volumetric efficiency. Therefore, to ensure normal operation, reduce damage risk, and improve volumetric efficiency, this embodiment implements oil return temperature control to maintain the refrigerant oil temperature within the compressor's required range.

[0151] Therefore, this application also provides a method for controlling the oil return of a compressor lubrication system. Wherein, as... Figure 14 As shown, the compressor lubrication system includes: a scroll compressor, an oil-gas separator connected to the outlet of the scroll compressor, and the oil outlet of the oil-gas separator connected to the oil inlet of the scroll compressor through an oil temperature control device.

[0152] In the embodiments of this application, such as Figure 15 As shown, the oil return control method includes:

[0153] S1501: Obtain the current oil temperature and target oil temperature of the scroll compressor.

[0154] In this embodiment, the target oil temperature is the oil temperature that enables the scroll compressor to operate at the target efficiency, which can be determined through prior experiments.

[0155] In one feasible embodiment of this application, the compressor lubrication system may further include a first temperature sensor. The first temperature sensor may be disposed inside the scroll compressor, at the outlet of the scroll compressor, at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator, for example... Figure 16 As shown, Figure 16 The diagram illustrates an implementation where the first temperature sensor is positioned at the oil outlet of the oil-gas separator. In this case, the current oil temperature of the scroll compressor can be obtained by acquiring the temperature value detected by the first temperature sensor.

[0156] In this embodiment, if the first temperature sensor is installed inside the scroll compressor, it will accurately represent the current oil temperature inside the scroll compressor. If the first temperature sensor is installed at the air outlet of the scroll compressor, the inlet of the oil-gas separator, or the oil outlet of the oil-gas separator, the temperature values ​​detected by the first temperature sensor at these locations can accurately represent the current oil temperature of the scroll compressor because these locations are relatively close to the scroll compressor. Therefore, based on the above feasible implementation, the current oil temperature of the scroll compressor can be easily and accurately obtained, improving the reliability of the solution.

[0157] In some optional embodiments of this application, considering that the optimal operating parameters of the scroll compressor may differ under different operating conditions, resulting in different target operating efficiencies and consequently different target oil temperatures, this optional embodiment allows for the pre-setting of target oil temperatures corresponding to different operating conditions. Thus, when obtaining the target oil temperature of the scroll compressor, the current operating condition of the compressor can be obtained first, and then the target oil temperature corresponding to that condition can be determined. In this way, when cooling the refrigeration oil, it can be cooled to the oil temperature required for different operating conditions, allowing the scroll compressor to use refrigeration oil at the appropriate temperature according to the current operating condition, resulting in better volumetric and mechanical efficiency.

[0158] The target oil temperature corresponding to different operating conditions can be determined through experiments or simulations.

[0159] In this embodiment, the scroll compressor can be used in an air conditioning system to provide a power source for the refrigerant circulation of the air conditioning system. For example, such as... Figure 17As shown, in this embodiment of the compressor lubrication system, the outlet of the oil-gas separator can be configured to connect to an air conditioning system to introduce the refrigerant output from the scroll compressor into the air conditioning system. Simultaneously, the refrigerant outlet of the air conditioning system's piping can be connected to the suction port of the scroll compressor to achieve refrigerant circulation.

[0160] In this embodiment, the operating state of the scroll compressor is related to the state of the air conditioning system it operates with. For example, if the air conditioning system needs cooling, then the desired refrigerant temperature is lower, and correspondingly, the desired refrigerant oil temperature for the scroll compressor is also lower. If the air conditioning system needs heating, then the desired refrigerant temperature is higher, and correspondingly, the desired refrigerant oil temperature for the scroll compressor is also higher. Therefore, in this embodiment, the operating conditions of the scroll compressor can include a first operating condition for cooperating with the air conditioning system for cooling, and a second operating condition for cooperating with the air conditioning system for heating. This allows for good coordination between the different operating modes of the air conditioning system when the compressor lubrication system is used in conjunction with the air conditioning system, enabling the scroll compressor to achieve better cooling or heating effects with the same power consumption.

[0161] In this embodiment, as mentioned above, the operating state of the scroll compressor is also related to its own temperature. When the temperature of the scroll compressor exceeds a set limit, it will be in a dangerous state, requiring cooling. Therefore, in this embodiment, the operating condition of the scroll compressor may also include the ultra-high temperature operating condition described in Embodiment 1. The target oil temperature corresponding to the ultra-high temperature operating condition can be configured as a safe oil temperature that allows the scroll compressor to operate safely. Thus, when it is determined that the scroll compressor is in an ultra-high temperature operating condition, the oil temperature control device is activated to cool the refrigeration oil, thereby reducing the risk of damage to the scroll compressor.

[0162] In this embodiment of the application, when obtaining the current operating condition of the scroll compressor, it can be first determined whether the scroll compressor is in an ultra-high temperature operating condition. If the scroll compressor is not in an ultra-high temperature operating condition, it can then be determined whether the scroll compressor is in a first operating condition or a second operating condition.

[0163] S1502: When the difference between the current oil temperature and the target oil temperature exceeds the preset temperature difference threshold, the oil temperature control device is used to cool down the refrigeration oil flowing through the oil temperature control device.

[0164] In this embodiment, the preset temperature difference threshold can be determined based on the actual acceptable deviation in volumetric efficiency. Optionally, the preset temperature difference threshold can be set to 0. In this case, if the current oil temperature is higher than the target oil temperature, the refrigeration oil flowing through the oil temperature control device will be cooled. Optionally, the preset temperature difference threshold can be set to a non-zero value, such as 5 degrees Celsius. Therefore, the oil temperature control device will only be activated to cool the refrigeration oil flowing through the oil temperature control device when the difference between the current oil temperature and the target oil temperature exceeds 5 degrees Celsius.

[0165] In this embodiment, the oil temperature control device may include an independent cooler, thereby controlling the cooling of the refrigeration oil flowing through the oil temperature control device by controlling the start and stop of the cooler.

[0166] In this embodiment, the oil temperature control device can reuse the refrigerant in the air conditioning system to achieve cooling control. For example, see [link to example]. Figure 18 As shown, the air conditioning system includes a condenser, and the oil temperature control device includes a first pipe for supplying refrigerant and a second control valve. The second control valve is installed on the first pipe, one end of which is connected to the outlet side of the condenser, and the other end of which is connected to the suction port of the scroll compressor. Thus, by controlling the opening and closing of the second control valve, the cooling of the refrigerant oil flowing through the oil temperature control device can be controlled.

[0167] Furthermore, when the cooling intensity of the refrigerator is adjustable, different levels of cooling intensity can be achieved for the refrigeration oil flowing through the oil temperature control device by controlling the cooling intensity of the refrigerator. Similarly, when the second control valve can be opened to different degrees, different levels of cooling intensity can be achieved for the refrigeration oil flowing through the oil temperature control device by controlling the opening degree of the second control valve.

[0168] For example, in the embodiments of this application, the return oil speed of the refrigeration oil in the compressor lubrication system can be obtained, and then the cooling intensity of the oil temperature control device can be controlled according to the return oil speed and the difference between the current oil temperature and the target oil temperature, so as to cool down the refrigeration oil flowing through the oil temperature control device.

[0169] Therefore, if the oil temperature control device includes an independent cooler and the cooler can adjust the cooling intensity, the above operation is as follows: the cooler can be controlled to adjust to the corresponding cooling intensity according to the oil return speed and the difference between the current oil temperature and the target oil temperature.

[0170] When the oil temperature control device includes a first pipeline and a second control valve, and the second control valve can be opened to different degrees, the above operation is as follows: the opening degree of the second control valve can be controlled according to the return oil speed and the difference between the current oil temperature and the target oil temperature.

[0171] In this embodiment, the cooling intensity (including the cooling intensity of the cooler or the opening degree of the second control valve) of the oil temperature control device can be preset for different oil return rates and different cooling differences, thereby controlling the cooling intensity of the oil temperature control device based on this correspondence. The cooling difference refers to the difference between the current oil temperature and the target oil temperature, which can be obtained by calculating the difference between the current oil temperature and the target oil temperature.

[0172] Optionally, in the embodiments of this application, the second control valve may be implemented using a controlled valve such as a controlled throttle valve or an electronic expansion valve, but this is not a limitation.

[0173] Optional, such as Figure 18 As shown, an air conditioning system may include a condenser, a throttling device (such as, but not limited to, an expansion valve or a control valve), and an evaporator to achieve the normal function of the air conditioning system. The throttling device is located between the condenser and the evaporator, and it can be located before the connection point between the main duct and the first duct of the air conditioning system, for example... Figure 18 As shown, it can also be installed after the connection point between the main duct and the first duct of the air conditioning system, for example... Figure 20 As shown, where, Figure 20 The third control valve in the system is a type of throttling device.

[0174] In this embodiment of the application, when the scroll compressor is operating at an ultra-high temperature, the cooling intensity of the oil temperature control device can be controlled to the maximum intensity, for example, by controlling the second control valve to open to the maximum degree, thereby maximizing the cooling of the scroll compressor and reducing the risk of damage to the scroll compressor.

[0175] Optionally, if no oil return control device is installed in the compressor lubrication system, the oil return rate of the refrigerant oil in the compressor lubrication system can be determined based on the pressure difference between the discharge pressure and suction pressure of the scroll compressor and the inner diameter of the pipes in the compressor lubrication system. However, if an oil return control device is installed in the compressor lubrication system, the oil return rate of the refrigerant oil in the compressor lubrication system can be determined based on the required oil return amount and the preset oil return duration, or based on the pressure difference between the discharge pressure and suction pressure of the compressor lubrication system, the oil return capacity controlled by the oil return control device (the opening degree of the first control valve and / or the speed of the oil pump), and various corresponding relationships described in Example 1, from which the oil return rate can be determined.

[0176] Optionally, if the compressor lubrication system includes an oil return volume control device, the oil temperature control device can be located between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor, for example... Figure 19 As shown.

[0177] When the oil temperature control device reuses the refrigerant in the air conditioning system to achieve cooling control, if the air conditioning system is in cooling mode, the air conditioning system itself will also have a need for refrigerant for cooling. At this time, the total amount of refrigerant may be insufficient to meet the refrigerant demand of both the air conditioning system and the oil temperature control device.

[0178] In this context, in one feasible embodiment of this application, the first cooling demand of the refrigerant in the air conditioning system can be obtained first. Then, based on the total amount of refrigerant and the first cooling demand, the remaining amount of refrigerant available for the oil temperature control device can be determined. Next, the second cooling demand of the refrigerant can be determined based on the oil return rate and the difference between the current oil temperature and the target oil temperature. When the second cooling demand is greater than or equal to the remaining refrigerant amount, the opening of the second control valve is controlled according to the remaining refrigerant amount; when the second cooling demand is less than the remaining refrigerant amount, the opening of the second control valve is controlled according to the second cooling demand. In this way, when using refrigerant from the air conditioning system to cool the refrigeration oil, priority can be given to ensuring the cooling demand of the air conditioning system itself, thereby achieving cooling of the refrigeration oil without significantly impacting the user experience and achieving dynamic coupling with the air conditioning system load.

[0179] The remaining refrigerant amount is equal to the total amount of refrigerant minus the initial refrigeration demand of the refrigerant.

[0180] Specifically, the second cooling demand corresponding to different oil return speeds and different cooling differences can be pre-constructed, as well as the opening degree of the second control valve corresponding to different second cooling demands can be pre-constructed. Then, based on these two correspondences, the second cooling demand and the opening degree of the second control valve can be determined.

[0181] Optionally, in this embodiment, when the scroll compressor is operating at extremely high temperatures, the second control valve can be directly opened to its maximum extent, and the refrigerant supplied to the air conditioning system can be shut off first, thereby maximizing the cooling of the scroll compressor and reducing the risk of damage. After the temperature of the refrigerant oil in the scroll compressor has dropped to a safe oil temperature, the refrigerant control described above can then be performed.

[0182] For example, such as Figure 20 As shown, a third control valve can be installed on the inlet side of the evaporator. When the scroll compressor is operating at ultra-high temperature, the second control valve can be directly controlled to open to its maximum opening, and the third control valve can be closed. When the temperature of the refrigeration oil in the scroll compressor drops to a safe oil temperature, the third control valve is controlled to open to the corresponding degree based on the first refrigeration demand, and the second control valve is controlled to open to the corresponding degree based on the second refrigeration demand.

[0183] In the embodiments of this application, the third control valve may also be implemented using a controlled valve such as a controlled throttle valve or an electronic expansion valve, but this is not a limitation.

[0184] In this embodiment, the compressor lubrication system may further include a second temperature sensor. The second temperature sensor may be located between the oil temperature control device and the oil inlet of the scroll compressor, for example... Figure 21 As shown.

[0185] At this point, the temperature value detected by the second temperature sensor can also be obtained. When the temperature value detected by the second temperature sensor is lower than the preset first stop temperature, the oil temperature control device is controlled to stop cooling the refrigeration oil flowing through it. This allows for timely cessation of refrigeration, saving energy and preventing excessively low oil temperature from affecting the subsequent separation of the refrigeration oil and refrigerant, which could lead to excessive refrigeration oil entering the air conditioning system and affecting its heat exchange.

[0186] Considering that the viscosity of refrigeration oil increases and its fluidity decreases in low-temperature environments, this can lead to ineffective lubrication of the various components of the scroll compressor, increasing friction and wear. This may result in start-up failure or unstable operation of the scroll compressor, thus affecting its reliability. Therefore, in one feasible embodiment of this application, before starting the scroll compressor, the ambient temperature and the oil temperature of the refrigeration oil in the compressor lubrication system can be obtained to determine whether the ambient temperature is lower than or equal to a preset ambient temperature threshold and whether the oil temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold. If the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigeration oil is lower than or equal to the preset start-up oil temperature threshold, the oil temperature control device is used to heat the refrigeration oil flowing through the oil temperature control device. This ensures that the oil temperature of the scroll compressor is not too low during startup, thereby improving the start-up success rate and operational stability of the scroll compressor.

[0187] For example, the preset ambient temperature threshold and the preset start-up oil temperature threshold can be set according to the situation of the scroll compressor. For example, the preset ambient temperature threshold can be set to -10 degrees and the preset start-up oil temperature threshold can be set to a value between 0 and 5 degrees.

[0188] In one feasible embodiment of this application, before starting the scroll compressor, only the oil temperature of the refrigeration oil in the compressor lubrication system can be obtained to determine whether the oil temperature is lower than or equal to a preset starting oil temperature threshold. If the oil temperature is lower than or equal to the preset starting oil temperature threshold, the oil temperature control device is used to heat the refrigeration oil flowing through the oil temperature control device.

[0189] In this embodiment, the scroll compressor can also be started when the temperature of the refrigeration oil is higher than a preset start-up oil temperature threshold. At this time, the oil temperature control device can be controlled to stop heating the refrigeration oil flowing through it.

[0190] In this embodiment of the application, a heating device, such as a PTC ceramic heater, can be provided in the oil temperature control device to achieve heating control of the refrigeration oil.

[0191] Similar to Embodiment 1, the compressor lubrication system in this embodiment may also include an oil collection tank. The oil collection tank can be located between the oil outlet of the oil-gas separator and the oil temperature control device, for example... Figure 22 As shown.

[0192] Similar to Embodiment 1, the compressor lubrication system in this embodiment may also include a filter. The filter can be located between the oil outlet of the oil-gas separator and the oil temperature control device, or between the oil temperature control device and the oil inlet of the scroll compressor, for example... Figure 23 As shown, by setting up a filter, impurities in the refrigeration oil of the compressor lubrication system can be filtered out, so that the compressor lubrication system has a good cleanliness.

[0193] Similar to Embodiment 1, in this embodiment, as... Figure 24 As shown, the compressor lubrication system may also include a third flow detection sensor. This third flow detection sensor can be positioned between the filter and the oil inlet of the scroll compressor. In this case, the flow data detected by the third flow detection sensor can be acquired, and if the difference between the flow data detected by the third flow detection sensor and a preset calibration value exceeds a preset difference range, a filter replacement reminder will be issued according to a preset prompt method.

[0194] Similar to Embodiment 1, in this embodiment, as... Figure 25 As shown, the compressor lubrication system may also include a first pressure sensor and a second pressure sensor. The first pressure sensor is located at the front end of the filter, and the second pressure sensor is located at the rear end of the filter. In this case, the detection values ​​of the first and second pressure sensors can be acquired, and the pressure difference across the filter can be determined based on these values. When the pressure difference exceeds a preset threshold, a filter replacement reminder is issued according to a preset prompt.

[0195] The prompting method can be found in Example 1, and will not be repeated here.

[0196] Based on the oil return control method of the compressor lubrication system provided in this application embodiment, by acquiring the current oil temperature and the target oil temperature of the scroll compressor, it is determined whether the scroll compressor is experiencing refrigerant oil overheating (the difference between the current oil temperature and the target oil temperature exceeding a preset temperature difference threshold is considered as refrigerant oil overheating). In this case, the oil temperature control device is promptly controlled to cool the refrigerant oil flowing through the oil temperature control device. This enables timely cooling of the overheated refrigerant oil, reduces the probability of the aforementioned problem, and reduces the risk of reduced volumetric efficiency of the scroll compressor.

[0197] Example 3:

[0198] In the embodiments of this application, the various implementation methods described in Embodiment 1 and Embodiment 2 can be combined with each other to form new implementation methods.

[0199] In this embodiment, the oil-gas separator can be an oil-gas separator with an oil-gas separation rate of over 99% to reduce the amount of refrigerant oil entering the air conditioning system.

[0200] In the embodiments of this application, the refrigeration oil can be an oil with poor compatibility with the refrigerant, such as mineral oil.

[0201] To facilitate understanding of the solutions in the embodiments of this application, Figure 26 The structure shown is used as an example to illustrate the solution of the embodiments of this application.

[0202] like Figure 26 As shown, the compressor lubrication system includes a scroll compressor, an oil-gas separator, an oil collection tank, a filter, a first temperature sensor, a first flow detection sensor, an oil pump, a first control valve, an oil temperature control device, and a second temperature sensor. After the scroll compressor starts operating, the refrigerant oil is separated by the oil-gas separator and flows into the oil collection tank for temporary storage.

[0203] When starting the scroll compressor, the ambient temperature and the refrigeration oil temperature are first collected. It is then determined whether the ambient temperature is lower than or equal to a preset ambient temperature threshold and whether the refrigeration oil temperature is lower than or equal to a preset start-up oil temperature threshold. If so, the oil temperature control device is used to heat the refrigeration oil flowing through it. If not, the scroll compressor starts when warm.

[0204] During the process of heating the refrigeration oil flowing through the oil temperature control device, the oil pump is also started and the first control valve is opened to circulate the refrigeration oil in the compressor lubrication system, thereby continuously feeding the heated refrigeration oil into the scroll compressor. Alternatively, the scroll compressor can be started at a low speed to further circulate the refrigeration oil in the compressor lubrication system.

[0205] During this process, the temperature of the refrigeration oil can be continuously collected, and it can be determined whether the temperature of the refrigeration oil is higher than the preset start-up oil temperature threshold.

[0206] Once the oil temperature exceeds the preset starting oil temperature threshold, the oil temperature control device stops heating the refrigeration oil and starts the scroll compressor when the engine is warm.

[0207] After the scroll compressor starts up, the compressor's speed, discharge temperature, and discharge pressure can be continuously collected. Based on this, the current oil return demand of the scroll compressor can be determined. Then, according to the oil return demand and the pressure difference between the discharge and suction pressures of the scroll compressor, the oil pump speed or the opening of the first control valve can be adjusted. Additionally, the current oil temperature of the scroll compressor can be continuously collected, and it can be determined whether the difference between the current oil temperature and the target oil temperature corresponding to the current operating condition exceeds a preset temperature difference threshold. If it does, the oil temperature control device is activated to cool the refrigerant oil flowing through it until the oil temperature drops to the target oil temperature.

[0208] In the embodiments of this application, the method execution subject of Embodiment 1, Embodiment 2 and Embodiment 3 can be a controller that is communicatively connected to the compressor lubrication system. For example, it can be a central controller or MCU (Microcontroller Unit) on a vehicle, or an on-board terminal on a vehicle, or an air conditioning control chip, etc.

[0209] Example 4:

[0210] Based on the same inventive concept, this application also provides an oil return control device 270 and an oil return control device 280 for a compressor lubrication system. Please refer to... Figure 27 and Figure 28 As shown, Figure 27 It shows the use of Figure 1 The method shown includes a return oil control device 270. Figure 28 It shows the use of Figure 15 The method shown includes an oil return control device 280. The specific functions of devices 270 and 280 are described above; to avoid repetition, detailed descriptions are omitted here. Devices 270 and 280 include at least one software function module that can be stored in memory or embedded in the operating system of devices 270 and 280 in the form of software or firmware. The structure of the compressor lubrication system can be found in Embodiments 1 and 2. Specifically:

[0211] See Figure 27 As shown, the device 270 includes: a first acquisition module 271 and a first control module 272. Wherein:

[0212] The first acquisition module 271 is used to acquire the operating parameters of the scroll compressor; the operating parameters include the exhaust temperature, intake temperature, exhaust pressure and intake pressure of the scroll compressor.

[0213] The first control module 272 is used to determine the current oil return demand of the scroll compressor based on the operating parameters of the scroll compressor, and to control the oil return capacity of the oil return quantity controller based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor.

[0214] In one feasible embodiment of this application, the operating parameters may further include the rotational speed and / or power consumption of the scroll compressor.

[0215] In one feasible embodiment of this application, when the compressor lubrication system further includes a first flow detection sensor, the first acquisition module 271 is further configured to acquire the flow data detected by the first flow detection sensor and determine the actual oil return volume of the scroll compressor based on the flow data; the first control module 272 is further configured to, when the actual oil return volume reaches the current oil return demand of the scroll compressor, shut down the oil return volume control device, or adjust the oil return capacity of the oil return volume control device to match the oil output volume per unit time at the oil outlet of the scroll compressor.

[0216] In the above feasible embodiments, the compressor lubrication system may further include an oil collection tank; the oil collection tank is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, and the first flow detection sensor is disposed after the oil collection tank.

[0217] In one feasible embodiment of this application, the first control module 272 is specifically used to: obtain the correspondence between the operating parameters of the scroll compressor and the oil return demand when the scroll compressor is at the target operating efficiency; and determine the current oil return demand of the scroll compressor from the correspondence based on the operating parameters of the scroll compressor.

[0218] In the above feasible embodiments, the first control module 272 is further specifically used for: before determining the current oil return demand of the scroll compressor based on the operating parameters of the scroll compressor, obtaining the current operating condition of the scroll compressor, and obtaining the target correspondence corresponding to the current operating condition; the target correspondence is: under the current operating condition, the correspondence between the operating parameters and the oil return demand when the scroll compressor is at a target operating efficiency; and determining the current oil return demand of the scroll compressor from the target correspondence based on the operating parameters of the scroll compressor.

[0219] In another feasible embodiment of this application, where the compressor lubrication system further includes a second flow detection sensor, which is disposed at the oil outlet of the oil-gas separator; or where the compressor lubrication system further includes an oil quantity detection device disposed on the scroll compressor for detecting the amount of refrigerant oil in the scroll compressor, the first control module 272 is specifically used for:

[0220] The detection value of the second flow detection sensor is obtained, and the amount of refrigerant oil in the scroll compressor is determined based on the amount of refrigerant oil in the scroll compressor, the detection value of the second flow detection sensor, and the oil-gas separation rate of the oil-gas separator; or, the amount of refrigerant oil in the scroll compressor detected by the oil quantity detection device is obtained; the correspondence between the operating parameters of the scroll compressor and the refrigerant oil demand when it is at the target operating efficiency is obtained; based on the operating parameters of the scroll compressor, the current refrigerant oil demand of the scroll compressor is determined from the correspondence; the difference between the current refrigerant oil demand of the scroll compressor and the amount of refrigerant oil in the scroll compressor is calculated to obtain the current oil return demand of the scroll compressor.

[0221] In the above feasible embodiments, the first control module 272 is further specifically used for: obtaining the current operating condition of the scroll compressor before determining the current oil return demand of the scroll compressor based on the operating parameters of the scroll compressor; obtaining the correspondence between the operating parameters and the refrigerant oil demand when the scroll compressor is at a target operating efficiency, including: obtaining the target correspondence corresponding to the current operating condition; the target correspondence is: under the current operating condition, the correspondence between the operating parameters and the refrigerant oil demand when the scroll compressor is at a target operating efficiency; determining the current refrigerant oil demand of the scroll compressor from the correspondence based on the operating parameters of the scroll compressor, including: determining the current refrigerant oil demand of the scroll compressor from the target correspondence based on the operating parameters of the scroll compressor.

[0222] In one feasible embodiment of this application, the oil return volume control device includes a first control valve; the first control module 272 is specifically used to control the opening degree of the first control valve according to the oil return demand and the pressure difference between the exhaust pressure and the intake pressure of the scroll compressor.

[0223] In one feasible embodiment of this application, the oil return volume control device includes an oil pump; the first control module 272 is specifically used to: control the rotational speed of the oil pump according to the oil return demand and the pressure difference between the exhaust pressure and the intake pressure of the scroll compressor.

[0224] In one feasible embodiment of this application, the oil return volume control device includes an oil pump and a first control valve; the first control module 272 is specifically used for: determining a target oil return speed based on the oil return demand and a preset oil return duration; if the first control valve can reach the target oil return speed at its maximum opening under the pressure difference between the discharge pressure and suction pressure of the scroll compressor, then controlling the opening of the first control valve based on the target oil return speed and the pressure difference between the discharge pressure and suction pressure of the scroll compressor; if the first control valve cannot reach the target oil return speed at its maximum opening under the pressure difference between the discharge pressure and suction pressure of the scroll compressor, then controlling the first control valve to be at its maximum opening, and controlling the rotational speed of the oil pump based on the difference between the target oil return speed and the maximum opening oil return speed; wherein, the maximum opening oil return speed is: the oil return speed when the oil pump is not running and the first control valve is at its maximum opening under the pressure difference between the discharge pressure and suction pressure of the scroll compressor.

[0225] In one feasible embodiment of this application, the compressor lubrication system further includes a filter, which is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor.

[0226] In the above feasible embodiments, the compressor lubrication system further includes a third flow detection sensor, which is disposed between the filter and the oil inlet of the scroll compressor; the first acquisition module 271 is also used to acquire the flow data detected by the third flow detection sensor; the first control module 272 is also used to remind the filter to replace according to a preset prompt method when the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds a preset difference range.

[0227] In the above feasible embodiments, the compressor lubrication system further includes a first pressure sensor and a second pressure sensor, the first pressure sensor being disposed at the front end of the filter and the second pressure sensor being disposed at the rear end of the filter; the first acquisition module 271 is further configured to acquire the detection values ​​of the first pressure sensor and the second pressure sensor; the first control module 272 is further configured to determine the pressure difference across the filter based on the detection values ​​of the first pressure sensor and the second pressure sensor; when the pressure difference exceeds a preset pressure difference threshold, a filter replacement reminder is given according to a preset prompt method.

[0228] In one feasible embodiment of this application, the compressor lubrication system further includes an oil temperature control device; the oil temperature control device is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor; the first acquisition module 271 is further configured to acquire the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that enables the scroll compressor to operate at a target efficiency; the first control module 272 is further configured to control the oil temperature control device to cool the refrigeration oil flowing through the oil temperature control device when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold.

[0229] In one optional embodiment of the above feasible implementation, the compressor lubrication system further includes: a first temperature sensor, disposed inside the scroll compressor, or disposed at the outlet of the scroll compressor, or disposed at the inlet of the oil-gas separator, or disposed at the oil outlet of the oil-gas separator; the first acquisition module 271 is specifically used to acquire the temperature value detected by the first temperature sensor; the temperature value detected by the first temperature sensor represents the current oil temperature of the scroll compressor.

[0230] In one optional embodiment of the above feasible implementation, the first acquisition module 271 is specifically used to acquire the current operating condition of the scroll compressor; and determine the target oil temperature corresponding to the current operating condition based on the current operating condition.

[0231] In one optional embodiment of the above feasible implementation, the outlet of the oil-gas separator is configured to be connected to an air conditioning system to introduce the refrigerant output by the scroll compressor into the air conditioning system; the operating conditions of the scroll compressor include: a first operating condition for cooperating with the air conditioning system for cooling, and a second operating condition for cooperating with the air conditioning system for heating.

[0232] In the above optional embodiments, the first control module 272 is specifically used to: obtain the return oil speed of the refrigeration oil in the compressor lubrication system; and control the cooling intensity of the oil temperature control device according to the return oil speed and the difference between the current oil temperature and the target oil temperature, so as to cool down the refrigeration oil flowing through the oil temperature control device.

[0233] In the above optional embodiment, the outlet of the oil-gas separator is configured to be connected to an air conditioning system to introduce the refrigerant output by the scroll compressor into the air conditioning system; the air conditioning system includes a condenser; the oil temperature control device includes: a first pipe for refrigerant flow and a second control valve; the second control valve is disposed on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the suction port of the scroll compressor; the first control module 272 is specifically used to: control the opening degree of the second control valve according to the oil return speed and the difference between the current oil temperature and the target oil temperature.

[0234] In the above optional embodiments, before the first control module 272 controls the opening of the second control valve based on the oil return speed, the difference between the current oil temperature and the target oil temperature, the first acquisition module 271 is further configured to acquire the first cooling demand of the refrigerant in the air conditioning system; the first control module 272 is specifically configured to: determine the remaining amount of refrigerant available for the oil temperature control device based on the total amount of refrigerant and the first cooling demand of the refrigerant; determine the second cooling demand of the refrigerant based on the oil return speed, the difference between the current oil temperature and the target oil temperature; when the second cooling demand is greater than or equal to the remaining amount of refrigerant, control the opening of the second control valve based on the remaining amount of refrigerant; when the second cooling demand is less than the remaining amount of refrigerant, control the opening of the second control valve based on the second cooling demand.

[0235] In one optional embodiment of the above feasible implementation, the compressor lubrication system further includes: a second temperature sensor disposed between the oil temperature control device and the oil inlet of the scroll compressor; the first acquisition module 271 is further configured to acquire the temperature value detected by the second temperature sensor; the first control module 272 is further configured to control the oil temperature control device to stop cooling the refrigeration oil flowing through the oil temperature control device when the temperature value detected by the second temperature sensor is lower than a preset first stop temperature.

[0236] In one optional embodiment of the above feasible implementation, the first acquisition module 271 is further configured to acquire the ambient temperature and the oil temperature of the refrigeration oil in the compressor lubrication system before starting the scroll compressor; the first control module 272 is further configured to: determine whether the ambient temperature is lower than or equal to a preset ambient temperature threshold and whether the oil temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold; and, if the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigeration oil is lower than or equal to the preset start-up oil temperature threshold, control the oil temperature control device to heat the refrigeration oil flowing through the oil temperature control device.

[0237] In the above optional embodiments, the first control module 272 is further configured to: start the scroll compressor when the oil temperature of the refrigeration oil is higher than the preset start-up oil temperature threshold.

[0238] See Figure 28 As shown, the device 280 includes: a second acquisition module 281 and a second control module 282. Wherein:

[0239] The second acquisition module 281 is used to acquire the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that enables the scroll compressor to operate at the target efficiency.

[0240] The second control module 282 is used to control the oil temperature control device to cool down the refrigeration oil flowing through the oil temperature control device when the difference between the current oil temperature and the target oil temperature exceeds a preset temperature difference threshold.

[0241] In one feasible embodiment of this application, the compressor lubrication system further includes: a first temperature sensor, disposed inside the scroll compressor, or disposed at the outlet of the scroll compressor, or disposed at the inlet of the oil-gas separator, or disposed at the oil outlet of the oil-gas separator; the second acquisition module 281 is specifically used to: acquire the temperature value detected by the first temperature sensor; the temperature value detected by the first temperature sensor represents the current oil temperature of the scroll compressor.

[0242] In one feasible embodiment of this application, the second acquisition module 281 is specifically used to: acquire the current operating condition of the scroll compressor; and determine the target oil temperature corresponding to the current operating condition based on the current operating condition.

[0243] In one feasible embodiment of this application, the outlet of the oil-gas separator is configured to be connected to an air conditioning system to introduce the refrigerant output by the scroll compressor into the air conditioning system; the operating conditions of the scroll compressor include: a first operating condition for cooperating with the air conditioning system for cooling, and a second operating condition for cooperating with the air conditioning system for heating.

[0244] In the above feasible implementation, the second control module 282 is specifically used to: obtain the return oil speed of the refrigeration oil in the compressor lubrication system; and control the cooling intensity of the oil temperature control device according to the return oil speed and the difference between the current oil temperature and the target oil temperature, so as to cool down the refrigeration oil flowing through the oil temperature control device.

[0245] In the above feasible embodiment, the outlet of the oil-gas separator is configured to be connected to an air conditioning system to introduce the refrigerant output by the scroll compressor into the air conditioning system; the air conditioning system includes a condenser; the oil temperature control device includes: a first pipe for refrigerant flow and a second control valve; the second control valve is disposed on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the suction port of the scroll compressor; the second control module 282 is specifically used to: control the opening degree of the second control valve according to the oil return speed and the difference between the current oil temperature and the target oil temperature.

[0246] In the above feasible implementation, before the second control module 282 controls the opening of the second control valve based on the oil return speed, the difference between the current oil temperature and the target oil temperature, the second acquisition module 281 is further configured to acquire the first cooling demand of the refrigerant in the air conditioning system; the second control module 282 is specifically configured to: determine the remaining amount of refrigerant available for the oil temperature control device based on the total amount of refrigerant and the first cooling demand of the refrigerant; determine the second cooling demand of the refrigerant based on the oil return speed, the difference between the current oil temperature and the target oil temperature; when the second cooling demand is greater than or equal to the remaining amount of refrigerant, control the opening of the second control valve based on the remaining amount of refrigerant; when the second cooling demand is less than the remaining amount of refrigerant, control the opening of the second control valve based on the second cooling demand.

[0247] In one feasible embodiment of this application, the compressor lubrication system further includes: a second temperature sensor disposed between the oil temperature control device and the oil inlet of the scroll compressor; the second acquisition module 281 is further configured to acquire the temperature value detected by the second temperature sensor; and the second control module 282 is further configured to control the oil temperature control device to stop cooling the refrigeration oil flowing through the oil temperature control device when the temperature value detected by the second temperature sensor is lower than a preset first stop temperature.

[0248] In one feasible embodiment of this application, the second acquisition module 281 is further configured to acquire the ambient temperature and the oil temperature of the refrigeration oil in the compressor lubrication system before starting the scroll compressor; the second control module 282 is further configured to: determine whether the ambient temperature is lower than or equal to a preset ambient temperature threshold and whether the oil temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold; and, if the ambient temperature is lower than or equal to the preset ambient temperature threshold and the oil temperature of the refrigeration oil is lower than or equal to the preset start-up oil temperature threshold, control the oil temperature control device to heat the refrigeration oil flowing through the oil temperature control device.

[0249] In one feasible embodiment of this application, the second control module 282 is further configured to: start the scroll compressor when the oil temperature of the refrigeration oil is higher than the preset start-up oil temperature threshold.

[0250] In one feasible embodiment of this application, the compressor lubrication system further includes a filter, which is disposed between the oil outlet of the oil-gas separator and the oil temperature control device, or between the oil temperature control device and the oil inlet of the scroll compressor.

[0251] In this feasible embodiment, the compressor lubrication system further includes a third flow detection sensor, which is disposed between the oil outlet of the oil-gas separator and the oil temperature control device, or between the oil temperature control device and the oil inlet of the scroll compressor; the second acquisition module 281 is further used to acquire the flow data detected by the third flow detection sensor; the second control module 282 is further used to remind the user to replace the filter according to a preset prompt method when the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds a preset difference range.

[0252] In this feasible embodiment, the compressor lubrication system further includes a first pressure sensor and a second pressure sensor, the first pressure sensor being disposed at the front end of the filter and the second pressure sensor being disposed at the rear end of the filter; the second acquisition module 281 is further configured to acquire the detection values ​​of the first pressure sensor and the second pressure sensor; the second control module 282 is further configured to determine the pressure difference across the filter based on the detection values ​​of the first pressure sensor and the second pressure sensor, and when the pressure difference exceeds a preset pressure difference threshold, to provide a filter replacement reminder according to a preset prompting method.

[0253] In one feasible embodiment of this application, the compressor lubrication system further includes an oil collection tank; the oil collection tank is disposed between the oil outlet of the oil-gas separator and the oil temperature control device.

[0254] For the sake of brevity, some of the content described in Embodiment 1, Embodiment 2, and Embodiment 3 will not be repeated in this embodiment.

[0255] Example 5:

[0256] This application also provides a control system, which includes a controller and a compressor lubrication system. The compressor lubrication system is shown in Embodiments 1 to 3. The controller is communicatively connected to the scroll compressor, oil return quantity controller and / or oil temperature control device, and various sensors in the compressor lubrication system, thereby enabling the controller to execute any of the oil return control methods described in Embodiments 1 to 3.

[0257] In the embodiments of this application, the controller may be, but is not limited to, a central controller or MCU (Microcontroller Unit) on a vehicle, or an on-board terminal in the vehicle, or an air conditioning control chip, etc.

[0258] In the embodiments of this application, the control system may further include more components, such as a memory, in which one or more programs are stored for execution by the controller to implement any of the oil return control methods described in Embodiments 1 to 3. For example, it may also include an internal communication bus for communication between the controller and the memory; or it may have an external communication interface, such as a USB (Universal Serial Bus) interface or a CAN (Controller Area Network) bus interface, to connect the controller to the compressor lubrication system; or it may have an information display component such as a display screen, but this is not a limitation.

[0259] This application also provides a means of transportation that includes the aforementioned control system.

[0260] In the embodiments of this application, the means of transportation may be, but is not limited to, vehicles (such as fuel vehicles, new energy vehicles, etc.), ships, trains, aircraft (such as airplanes, etc.), etc.

[0261] In this embodiment of the application, the vehicle may include other devices in addition to the aforementioned control system, and this embodiment of the application does not limit this.

[0262] Based on the same inventive concept, this embodiment also provides a computer-readable storage medium, such as a floppy disk, optical disk, hard disk, flash memory, USB flash drive, SD (Secure Digital Memory Card), MMC (Multimedia Card), etc., in which one or more programs implementing the above steps are stored. These one or more programs can be executed by one or more controllers to implement any of the oil return control methods described in Embodiments 1 to 3. Further details will not be elaborated here.

[0263] The apparatuses and methods disclosed in the embodiments provided in this application can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the coupling or direct coupling or communication connection shown or discussed may be through some communication interface; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0264] Furthermore, the units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0265] Furthermore, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0266] In this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying any such actual relationship or order between these entities or operations.

[0267] In this article, "multiple" refers to two or more.

[0268] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for controlling oil return in a compressor lubrication system, characterized in that, The compressor lubrication system includes: a scroll compressor, an oil-gas separator connected to the outlet of the scroll compressor, and the oil outlet of the oil-gas separator connected to the oil inlet of the scroll compressor via an oil return flow control device; the method includes: Obtain the operating parameters of the scroll compressor; the operating parameters include the discharge temperature, suction temperature, discharge pressure, and suction pressure of the scroll compressor; The current oil return demand of the scroll compressor is determined based on the operating parameters of the scroll compressor. The oil return capacity of the oil return quantity controller is controlled based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor. The compressor lubrication system further includes an oil temperature control device; the oil temperature control device is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor; the outlet of the oil-gas separator is configured to connect to an air conditioning system to introduce the refrigerant output by the scroll compressor into the air conditioning system; the air conditioning system includes a condenser; the oil temperature control device includes: a first pipe for refrigerant flow and a second control valve; the second control valve is disposed on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the suction port of the scroll compressor; the method further includes: Obtain the current oil temperature and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that enables the scroll compressor to operate at the target efficiency. Obtain the return oil speed of the refrigeration oil in the compressor lubrication system; Obtain the first cooling demand of the refrigerant in the air conditioning system; The remaining amount of refrigerant available for the oil temperature control device is determined based on the total amount of refrigerant and the first refrigeration requirement of the refrigerant. The second refrigeration requirement of the refrigerant is determined based on the oil return rate and the difference between the current oil temperature and the target oil temperature; When the second cooling demand is greater than or equal to the remaining refrigerant amount, the opening degree of the second control valve is controlled according to the remaining refrigerant amount; When the second cooling demand is less than the remaining refrigerant quantity, the opening degree of the second control valve is controlled according to the second cooling demand.

2. The oil return control method for the compressor lubrication system as described in claim 1, characterized in that, The operating parameters also include the rotational speed and / or power consumption of the scroll compressor.

3. The oil return control method for the compressor lubrication system as described in claim 1, characterized in that, The compressor lubrication system further includes a first flow detection sensor, which is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor; the method further includes: The flow data detected by the first flow detection sensor is obtained, and the actual oil return volume of the scroll compressor is determined based on the flow data. When the actual oil return volume reaches the current oil return demand of the scroll compressor, the oil return volume control device is turned off, or the oil return capacity of the oil return volume control device is adjusted to match the oil output volume per unit time at the oil outlet of the scroll compressor.

4. The oil return control method for the compressor lubrication system as described in claim 1, characterized in that, The current oil return demand of the scroll compressor is determined based on its operating parameters, including: Obtain the correspondence between the operating parameters of the scroll compressor and the oil return demand when the compressor is at the target operating efficiency; Based on the operating parameters of the scroll compressor, the current oil return demand of the scroll compressor is determined from the corresponding relationship.

5. The oil return control method for the compressor lubrication system as described in claim 4, characterized in that, Before determining the current oil return demand of the scroll compressor based on its operating parameters, the method further includes: obtaining the current operating condition of the scroll compressor. Obtaining the correspondence between the operating parameters and the oil return demand when the scroll compressor is at the target operating efficiency includes: obtaining the target correspondence corresponding to the current operating condition; the target correspondence is: under the current operating condition, the correspondence between the operating parameters and the oil return demand when the scroll compressor is at the target operating efficiency; Determining the current oil return demand of the scroll compressor from the correspondence based on the operating parameters of the scroll compressor includes: determining the current oil return demand of the scroll compressor from the target correspondence based on the operating parameters of the scroll compressor.

6. The oil return control method for the compressor lubrication system as described in claim 1, characterized in that, The compressor lubrication system further includes a second flow detection sensor, which is located at the oil outlet of the oil-gas separator; or, the compressor lubrication system further includes an oil quantity detection device, which is located on the scroll compressor and is used to detect the amount of refrigerant oil in the scroll compressor. The current oil return demand of the scroll compressor is determined based on its operating parameters, including: The detection value of the second flow detection sensor is obtained, and the amount of refrigerant oil in the scroll compressor is determined based on the amount of refrigerant oil in the scroll compressor, the detection value of the second flow detection sensor, and the oil-gas separation rate of the oil-gas separator; or, the amount of refrigerant oil in the scroll compressor detected by the oil quantity detection device is obtained. Obtain the correspondence between the operating parameters of the scroll compressor and the required amount of refrigeration oil when the compressor is at the target operating efficiency; Based on the operating parameters of the scroll compressor, the current refrigerant oil requirement of the scroll compressor is determined from the corresponding relationship; The difference between the current refrigerant oil demand of the scroll compressor and the amount of refrigerant oil in the scroll compressor is calculated to obtain the current oil return demand of the scroll compressor.

7. The oil return control method for the compressor lubrication system as described in claim 6, characterized in that, Before determining the current oil return demand of the scroll compressor based on its operating parameters, the method further includes: obtaining the current operating condition of the scroll compressor. Obtaining the correspondence between the operating parameters and the refrigerant oil demand when the scroll compressor is at the target operating efficiency includes: obtaining the target correspondence corresponding to the current operating condition; the target correspondence is: under the current operating condition, the correspondence between the operating parameters and the refrigerant oil demand when the scroll compressor is at the target operating efficiency; Determining the current refrigerant oil requirement of the scroll compressor from the correspondence based on the operating parameters of the scroll compressor includes: determining the current refrigerant oil requirement of the scroll compressor from the target correspondence based on the operating parameters of the scroll compressor.

8. The oil return control method for the compressor lubrication system as described in claim 3, characterized in that, The compressor lubrication system also includes an oil collection tank; the oil collection tank is located between the oil outlet of the oil-gas separator and the oil return volume control device, and the first flow detection sensor is located after the oil collection tank.

9. The oil return control method for the compressor lubrication system as described in claim 1, characterized in that, The oil return volume control device includes a first control valve; The oil return capacity of the oil return quantity controller is controlled based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, including: The opening degree of the first control valve is controlled according to the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor.

10. The oil return control method for a compressor lubrication system as described in claim 1, characterized in that, The oil return volume control device includes an oil pump; The oil return capacity of the oil return quantity controller is controlled based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, including: The speed of the oil pump is controlled based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor.

11. The oil return control method for a compressor lubrication system as described in claim 1, characterized in that, The oil return volume control device includes an oil pump and a first control valve; The oil return capacity of the oil return quantity controller is controlled based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, including: The target oil return speed is determined based on the oil return demand and the preset oil return duration. If the first control valve can reach the target oil return speed at its maximum opening under the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, then the opening of the first control valve is controlled according to the target oil return speed and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor. If the first control valve cannot reach the target oil return speed at its maximum opening under the pressure difference between the discharge pressure and the suction pressure of the scroll compressor, then the first control valve is controlled to be at its maximum opening, and the speed of the oil pump is controlled according to the difference between the target oil return speed and the maximum opening oil return speed. The maximum opening oil return speed is defined as the oil return speed of the first control valve at its maximum opening when the oil pump is not running and the pressure difference between the exhaust pressure and the intake pressure of the scroll compressor is between the exhaust pressure and the intake pressure.

12. The oil return control method for a compressor lubrication system as described in claim 1, characterized in that, The compressor lubrication system also includes a filter, which is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor.

13. The oil return control method for a compressor lubrication system as described in claim 12, characterized in that, The compressor lubrication system further includes a third flow detection sensor, which is disposed between the filter and the oil inlet of the scroll compressor; the method further includes: Acquire the flow data detected by the third flow detection sensor; When the difference between the flow data detected by the third flow detection sensor and the preset calibration value exceeds a preset difference range, a filter replacement reminder will be issued according to a preset prompt method.

14. The oil return control method for a compressor lubrication system as described in claim 12, characterized in that, The compressor lubrication system further includes a first pressure sensor and a second pressure sensor, the first pressure sensor being disposed at the front end of the filter and the second pressure sensor being disposed at the rear end of the filter; the method further includes: The detection values ​​of the first pressure sensor and the second pressure sensor are obtained, and the pressure difference across the filter is determined based on the detection values ​​of the first pressure sensor and the second pressure sensor. When the differential pressure exceeds a preset differential pressure threshold, a filter replacement reminder will be issued according to a preset prompt method.

15. The oil return control method for a compressor lubrication system as described in claim 1, characterized in that, The compressor lubrication system further includes: a first temperature sensor, which is disposed inside the scroll compressor, or at the outlet of the scroll compressor, or at the inlet of the oil-gas separator, or at the oil outlet of the oil-gas separator; Obtaining the current oil temperature of the scroll compressor includes: The temperature value detected by the first temperature sensor is obtained; the temperature value detected by the first temperature sensor represents the current oil temperature of the scroll compressor.

16. The oil return control method for a compressor lubrication system as described in claim 1, characterized in that, Obtaining the target oil temperature of the scroll compressor includes: Obtain the current operating condition of the scroll compressor; The target oil temperature corresponding to the current operating condition is determined based on the current operating condition.

17. The oil return control method for a compressor lubrication system as described in claim 1, characterized in that, The outlet of the oil-gas separator is configured to connect to the air conditioning system so as to introduce the refrigerant output by the scroll compressor into the air conditioning system; The operating conditions of the scroll compressor include: a first operating condition for cooperating with the air conditioning system for cooling, and a second operating condition for cooperating with the air conditioning system for heating.

18. The oil return control method for a compressor lubrication system as described in claim 1, characterized in that, The compressor lubrication system further includes: a second temperature sensor, disposed between the oil temperature control device and the oil inlet of the scroll compressor; the method further includes: Obtain the temperature value detected by the second temperature sensor; When the temperature value detected by the second temperature sensor is lower than the preset first stop temperature, the oil temperature control device is controlled to stop cooling the refrigeration oil flowing through the oil temperature control device.

19. The oil return control method for a compressor lubrication system as described in claim 1, characterized in that, The method further includes: Before starting the scroll compressor, obtain the ambient temperature and the oil temperature of the refrigeration oil in the compressor lubrication system; Determine whether the ambient temperature is lower than or equal to a preset ambient temperature threshold and whether the temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold; When the ambient temperature is lower than or equal to a preset ambient temperature threshold and the temperature of the refrigeration oil is lower than or equal to a preset start-up oil temperature threshold, the oil temperature control device is used to heat the refrigeration oil flowing through the oil temperature control device.

20. The oil return control method for a compressor lubrication system as described in claim 19, characterized in that, The method further includes: The scroll compressor is started when the temperature of the refrigeration oil is higher than the preset start-up oil temperature threshold.

21. A return oil control device for a compressor lubrication system, characterized in that, The compressor lubrication system includes: a scroll compressor; an oil-gas separator connected to the outlet of the scroll compressor; the oil outlet of the oil-gas separator is connected to the oil inlet of the scroll compressor via an oil return control device; the oil return control device includes: The first acquisition module is used to acquire the operating parameters of the scroll compressor; the operating parameters include the exhaust temperature, intake temperature, exhaust pressure and intake pressure of the scroll compressor. The first control module is used to determine the current oil return demand of the scroll compressor based on the operating parameters of the scroll compressor, and to control the oil return capacity of the oil return quantity controller based on the oil return demand and the pressure difference between the discharge pressure and the suction pressure of the scroll compressor. The compressor lubrication system further includes an oil temperature control device; the oil temperature control device is disposed between the oil outlet of the oil-gas separator and the oil return volume control device, or between the oil return volume control device and the oil inlet of the scroll compressor; the gas outlet of the oil-gas separator is configured to be connected to an air conditioning system to introduce the refrigerant output by the scroll compressor into the air conditioning system; the air conditioning system includes a condenser; the oil temperature control device includes: a first pipe for refrigerant flow and a second control valve; the second control valve is disposed on the first pipe, one end of the first pipe is connected to the outlet side of the condenser, and the other end of the first pipe is connected to the suction port of the scroll compressor; The first acquisition module is further configured to acquire the current oil temperature of the scroll compressor and the target oil temperature of the scroll compressor; the target oil temperature is the oil temperature that enables the scroll compressor to operate at the target efficiency; and acquire the first cooling demand of the refrigerant in the air conditioning system. The first control module is further configured to: acquire the return oil speed of the refrigeration oil in the compressor lubrication system; determine the remaining amount of refrigerant available for use by the oil temperature control device based on the total amount of refrigerant and the first refrigeration demand of the refrigerant; determine the second refrigeration demand of the refrigerant based on the return oil speed and the difference between the current oil temperature and the target oil temperature; control the opening degree of the second control valve based on the remaining refrigerant when the second refrigeration demand is greater than or equal to the remaining refrigerant; and control the opening degree of the second control valve based on the second refrigeration demand when the second refrigeration demand is less than the remaining refrigerant.

22. A control system, characterized in that, include: Controller and compressor lubrication system; The compressor lubrication system includes: a scroll compressor; an oil-gas separator connected to the outlet of the scroll compressor; the oil outlet of the oil-gas separator being connected to the oil inlet of the scroll compressor via an oil return volume control device; a controller being connected to the scroll compressor and the oil return volume control device; and the controller being used to execute the oil return control method of the compressor lubrication system as described in any one of claims 1-20.

23. A means of transportation, characterized in that, Includes the control system as described in claim 22.

24. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores one or more programs, which can be executed by one or more controllers to implement the oil return control method for the compressor lubrication system as described in any one of claims 1-20.

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