Oil supply system, air conditioning unit and control method thereof

Abstract

The application discloses an oil supply system, an air conditioning unit and a control method thereof, wherein the oil supply system is used for supplying oil for an open screw compressor, and the open screw compressor comprises an exhaust pipeline and an oil return pipeline; the oil supply system comprises: an oil-gas transmission system, which comprises a gas driving pipeline, a transmission device and a lubricating oil driven pipeline, the gas driving pipeline is connected with the exhaust pipeline of the open screw compressor, one end of the transmission device is connected with the gas driving pipeline, and the other end of the transmission device is connected with the lubricating oil driven pipeline, and the oil-gas transmission system is used for driving the lubricating oil in the oil return pipeline by using the gaseous refrigerant in the exhaust pipeline to return oil. The application solves the problem that the oil supply pump of the semi-closed screw compressor in the prior art needs to work continuously and is difficult to supply oil according to working conditions, realizes the oil pump function, can provide corresponding oil flow and oil pressure under different working conditions, and makes the unit obtain sufficient lubrication, cooling and sealing effect under various working conditions.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to an oil supply system, an air conditioning unit, and a control method thereof. Background Technology

[0002] For large open-type screw compressor refrigeration units, compared to semi-hermetic screw compressors, open-type compressors have higher requirements for lubrication, cooling, and sealing. If the compressor does not receive sufficient refrigerant oil during operation, it will lead to problems such as excessively high compressor discharge temperature and poor sealing, resulting in reduced energy efficiency or even compressor damage. Therefore, open-type screw compressor refrigeration units are commonly equipped with an oil pump to continuously and forcibly supply oil to the compressor to maintain its normal operation.

[0003] However, existing oil pumps have many drawbacks: they need to work continuously to maintain the normal operation of the compressor, which shortens their service life. They also struggle to adapt to varying oil pressures required by constantly changing operating conditions, making it difficult to control oil pressure as conditions change, which is detrimental to the stable operation of the compressor.

[0004] There is currently no effective solution to the problem that the oil supply pump of a semi-hermetic screw compressor in related technologies needs to work continuously and is difficult to supply oil according to changes in operating conditions. Summary of the Invention

[0005] This invention provides an oil supply system, an air conditioning unit, and a control method thereof, to at least solve the problem in the prior art that the oil supply pump of a semi-hermetic screw compressor needs to work continuously and is difficult to supply oil according to changes in operating conditions.

[0006] To address the aforementioned technical problems, according to one aspect of the present invention, an oil supply system is provided for supplying oil to an open-type screw compressor, the open-type screw compressor including an exhaust pipe and an oil return pipe; the oil supply system includes an oil-gas transmission system, comprising: a gas drive pipe, a transmission device, and a lubricating oil driven pipe, the gas drive pipe being connected to the exhaust pipe of the open-type screw compressor, one end of the transmission device being connected to the gas drive pipe, and the other end being connected to the lubricating oil driven pipe, the oil-gas transmission system being used to drive the lubricating oil in the oil return pipe to return oil using gaseous refrigerant in the exhaust pipe.

[0007] Furthermore, the transmission device includes: a steam turbine located on the gas drive pipeline, the steam turbine being driven by the gaseous refrigerant in the exhaust pipeline; a pump impeller located on the lubricating oil driven pipeline, used to drive the lubricating oil in the return oil pipeline to flow; and a drive shaft, one end connected to the steam turbine and the other end connected to the pump impeller, used to drive the pump impeller to operate using the steam turbine.

[0008] Furthermore, it also includes: a bypass solenoid valve located on the exhaust pipe; the inlet end of the gas drive pipe is connected to the inlet end of the bypass solenoid valve, and the outlet end of the gas drive pipe is connected to the outlet end of the bypass solenoid valve.

[0009] Furthermore, it also includes: an oil pump located on the lubricating oil driven pipeline; the inlet end of the lubricating oil driven pipeline is connected to the inlet end of the oil pump, and the outlet end of the lubricating oil driven pipeline is connected to the outlet end of the oil pump.

[0010] Furthermore, it also includes: a pressure sensor located at the oil return port of the open screw compressor, used to detect the oil return pressure of the open screw compressor; and a check valve located at the outlet end of the lubricating oil driven pipeline, used to prevent the lubricating oil in the lubricating oil driven pipeline from flowing back.

[0011] According to another aspect of the present invention, an air conditioning unit is provided, including an oil supply system as described above and an open-type screw compressor.

[0012] Furthermore, the air conditioning unit also includes: an oil separator located at the discharge port of the open screw compressor; wherein, the bypass solenoid valve of the oil supply system is located on the pipeline between the oil separator and the condenser of the air conditioning unit; an oil cooler, one end of which is connected to the lubricating oil outlet of the oil separator, and the other end of which is connected to the oil return port of the open screw compressor; wherein, the oil pump of the oil supply system is located on the pipeline between the oil cooler and the oil return port of the open screw compressor.

[0013] According to another aspect of the present invention, an air conditioning unit control method is provided, applied to the air conditioning unit as described above, the method comprising: detecting the current oil return pressure of an open-type screw compressor; obtaining a preset range of the oil return pressure of the open-type screw compressor; and controlling the oil supply system to return oil according to the current oil return pressure and the preset range of the oil return pressure.

[0014] Furthermore, before detecting the current return oil pressure of the open-type screw compressor, the method further includes: controlling the oil pump of the oil supply system to start after the air conditioning unit is turned on; controlling the open-type screw compressor to start after a preset time after the oil pump starts; and triggering the detection of the current return oil pressure of the open-type screw compressor after the open-type screw compressor starts.

[0015] Furthermore, controlling the oil supply system to return oil based on the current return oil pressure and the preset range of the return oil pressure includes: controlling the oil pump to remain on when the current return oil pressure is less than the minimum value of the preset range of the return oil pressure; controlling the oil pump to gradually unload when the current return oil pressure is greater than or equal to the minimum value of the preset range of the return oil pressure and less than the maximum value of the preset range of the return oil pressure; and detecting whether the oil pump has stopped when the current return oil pressure is greater than the maximum value of the preset range of the return oil pressure, and controlling the bypass solenoid valve of the oil supply system to open after the oil pump stops.

[0016] According to another aspect of the present invention, a storage medium containing computer-executable instructions is provided, which, when executed by a computer processor, are used to perform the air conditioning unit control method as described above.

[0017] This invention provides an adaptive oil supply system for supplying oil to an open-type screw compressor. The system includes an oil-gas drive system comprising a gas drive pipeline, a transmission device, and a lubricating oil driven pipeline. The gas drive pipeline is connected to the exhaust pipeline of the open-type screw compressor. One end of the transmission device is connected to the gas drive pipeline, and the other end is connected to the lubricating oil driven pipeline. The oil-gas drive system uses the gaseous refrigerant in the exhaust pipeline to drive the lubricating oil in the return oil pipeline for return oil flow. This exhaust system uses the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow. The higher the compressor speed, the greater the oil supply, perfectly meeting the requirement of a larger amount of refrigerant oil at higher compressor speeds. Therefore, this invention uses the kinetic energy of the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow, providing corresponding oil flow and pressure under different operating conditions, ensuring sufficient lubrication, cooling, and sealing for the unit under various conditions. At the same time, when used properly, replacing the oil pump function avoids the wear and tear on the oil pump caused by continuous operation, reduces the power consumption of the oil pump, lowers the operating cost, extends the service life of the oil pump, and improves the energy efficiency and operational stability of the compressor, especially the open screw compressor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an optional structure of an oil supply system according to an embodiment of the present invention;

[0019] Figure 2 This is an optional flowchart of an air conditioning unit control method according to an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Compressor; 2. Oil separator; 3. Condenser; 4. Oil cooler; 5. Steam turbine; 6. Drive shaft; 7. Pump impeller; 8. Bypass solenoid valve; 9. Oil pump; 10. Oil return port; 11. Check valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0024] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0025] It should be understood that although the terms first, second, third, etc., may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0026] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0027] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0028] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Example 1

[0029] As mentioned earlier, existing oil pumps have many drawbacks: they require continuous operation to maintain the compressor's normal operation, which shortens their lifespan. Furthermore, they struggle to adapt to varying oil pressures required by constantly changing operating conditions, making it difficult to control oil pressure and hindering stable compressor operation.

[0030] Addressing the problem that the oil pump of a semi-hermetic screw compressor needs to operate continuously and is difficult to supply oil according to changes in operating conditions, a preferred embodiment of the present invention provides an oil supply system for supplying oil to an open screw compressor, which includes an exhaust pipe and an oil return pipe.

[0031] Specifically Figure 1 This diagram illustrates one possible structure of the oil supply system, such as... Figure 1 As shown, the oil supply system includes an oil-gas transmission system, which includes:

[0032] Gas-driven piping;

[0033] Transmission device;

[0034] The lubricating oil is driven through the pipeline;

[0035] Among them, the gas drive pipeline is connected to the exhaust pipeline of the open screw compressor 1, one end of the transmission device is connected to the gas drive pipeline, and the other end is connected to the lubricating oil driven pipeline. The oil-gas transmission system is used to drive the lubricating oil in the return oil pipeline to return oil using the gaseous refrigerant in the exhaust pipeline.

[0036] In the above embodiments, an adaptive oil supply system is provided for supplying oil to an open-type screw compressor. This system includes an oil-gas transmission system, comprising a gas drive pipeline, a transmission device, and a lubricating oil driven pipeline. The gas drive pipeline is connected to the exhaust pipeline of the open-type screw compressor. One end of the transmission device is connected to the gas drive pipeline, and the other end is connected to the lubricating oil driven pipeline. The oil-gas transmission system uses the gaseous refrigerant in the exhaust pipeline to drive the lubricating oil in the return oil pipeline for return oil flow. This exhaust system uses the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow. The higher the compressor speed, the greater the oil supply, perfectly meeting the requirement of a larger amount of refrigerant oil at higher compressor speeds. Therefore, this invention uses the kinetic energy of the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow, providing corresponding oil flow and pressure under different operating conditions, ensuring sufficient lubrication, cooling, and sealing effects for the unit under various conditions. At the same time, when used properly, replacing the oil pump function avoids the wear and tear on the oil pump caused by continuous operation, reduces the power consumption of the oil pump, lowers the operating cost, extends the service life of the oil pump, and improves the energy efficiency and operational stability of the compressor, especially the open screw compressor.

[0037] like Figure 1 As shown, the transmission device includes: a steam turbine 5, located on the gas drive pipeline, which is driven by the gaseous refrigerant in the exhaust pipeline; a pump impeller 7, located on the lubricating oil driven pipeline, used to drive the lubricating oil in the return oil pipeline to flow; and a drive shaft 6, one end connected to the steam turbine 5 and the other end connected to the pump impeller 7, used to drive the pump impeller 7 to operate using the steam turbine 5. Optionally, the drive shaft 6 is a sealed drive shaft to improve the transmission efficiency.

[0038] In addition, it also includes a sealed housing. The transmission device consists of a steam turbine 5, a sealed transmission shaft 6, a pump wheel 7, and a sealed housing. The number and size of the blades of the oil pump 9, steam turbine 5, and pump wheel 7 are designed according to the required oil supply of the unit. It makes full use of the high temperature and high pressure refrigerant discharged from the compressor to drive the lubricating oil back to the compressor's return port 10, and adapts to the compressor's load and operating conditions to maintain the operational stability of the compressor and the oil supply system.

[0039] To achieve precise control of the oil supply, the oil supply system also includes: a bypass solenoid valve 8, located on the exhaust pipe; the inlet end of the gas drive pipe is connected to the inlet end of the bypass solenoid valve 8, and the outlet end of the gas drive pipe is connected to the outlet end of the bypass solenoid valve 8. When the main exhaust pipe solenoid valve is open, the turbine 5's speed decreases due to the exhaust bypass, thereby reducing the speed of the oil pump 9 and lowering the oil pressure to prevent excessive oil supply from causing the compressor to operate with liquid.

[0040] Preferably, it further includes: an oil pump 9, located on the lubricating oil driven pipeline; the inlet end of the lubricating oil driven pipeline is connected to the inlet end of the oil pump 9, and the outlet end of the lubricating oil driven pipeline is connected to the outlet end of the oil pump 9.

[0041] Oil pump 9 and the oil-gas transmission system can supply oil independently or simultaneously. Optionally, before starting the open-type screw compressor 1 refrigeration unit, oil pump 9 is started first to pre-lubricate the moving parts of compressor 1, reducing dry friction during startup and maintaining stable unit operation. After compressor 1 starts, low-pressure refrigerant enters compressor 1 through the suction port, is compressed to form high-temperature, high-pressure gas, and enters the oil separator to separate the refrigerant oil (lubricating oil) and refrigerant. The solenoid valve closes, and the separated refrigerant enters the condenser 3 via turbine 5 for cooling. Turbine 5 is driven by the high-pressure refrigerant and drives pump wheel 7 via sealed drive shaft 6. After separation, the refrigerant oil flows from the oil separator to the oil cooler 4 and then flows into the oil supply port of compressor 1 via oil pump 9 or pump wheel 7. Driven by turbine 5, pump wheel 7 can pressurize the refrigerant oil on this path, increasing the oil supply pressure or oil quantity.

[0042] like Figure 1 As shown, it also includes: a pressure sensor located at the oil return port 10 of the open screw compressor 1, used to detect the oil return pressure of the open screw compressor 1; and a check valve 11 located at the outlet end of the lubricating oil driven pipeline, used to prevent the lubricating oil in the lubricating oil driven pipeline from flowing back.

[0043] To achieve precise control, a pressure sensor is added to detect the return oil pressure of the open screw compressor. As the compressor is loaded, the refrigerant flow and pressure gradually increase, and the speed of the turbine and pump wheel also increases. The pressure of the pump wheel supplying the refrigeration oil gradually increases. The operation of the oil supply system can be adjusted according to the return oil pressure to avoid insufficient lubrication due to insufficient oil supply or excessive oil supply causing the compressor to run with liquid. Example 2

[0044] Based on the oil supply system provided in Embodiment 1 above, an air conditioning unit is also provided in a preferred embodiment 2 of the present invention, including the oil supply system as described above.

[0045] Figure 1 A schematic diagram of an alternative structure for the air conditioning unit containing the oil supply system is also shown, such as... Figure 1 As shown, the air conditioning unit includes the aforementioned oil supply system and an open-type screw compressor.

[0046] In addition, the air conditioning unit also includes:

[0047] Oil separator 2 is located at the discharge port of open screw compressor 1; wherein, bypass solenoid valve 8 of oil supply system is located on the pipeline between oil separator 2 and condenser 3 of air conditioning unit;

[0048] The oil cooler 4 is connected at one end to the lubricating oil outlet of the oil separator 2 and at the other end to the oil return port 10 of the open screw compressor; wherein, the oil pump 9 of the oil supply system is located on the pipeline between the oil cooler 4 and the oil return port 10 of the open screw compressor.

[0049] The refrigerant oil supply system of the air conditioning unit containing the open-type screw compressor mainly consists of an oil pump, an oil-gas transmission system (composed of a turbine, a sealed drive shaft, a pump wheel, and a sealed housing), a pressure sensor, a check valve, and a solenoid valve. The number and size of the oil pump, turbine, and pump wheel blades are designed according to the required oil supply of the unit.

[0050] Before starting an open-type screw compressor refrigeration unit, the oil pump is started first to pre-lubricate the moving parts of the compressor, reducing dry friction during startup and maintaining stable unit operation.

[0051] After the compressor starts, the low-pressure refrigerant enters the compressor through the suction port, and after compression, it forms a high-temperature and high-pressure gas that enters the oil separator to separate the refrigeration oil and refrigerant. The solenoid valve closes, and after the refrigerant is separated, it enters the condenser through the turbine for cooling. The turbine is driven by the high-pressure refrigerant and drives the pump wheel through the sealed drive shaft.

[0052] After separation, the refrigeration oil flows to the oil cooler and then into the compressor oil supply port via the oil pump or pump impeller. Driven by the steam turbine, the pump impeller can pressurize the refrigeration oil on this path.

[0053] In the above embodiments, an adaptive oil supply system is provided for supplying oil to an open-type screw compressor. This system includes an oil-gas transmission system, comprising a gas drive pipeline, a transmission device, and a lubricating oil driven pipeline. The gas drive pipeline is connected to the exhaust pipeline of the open-type screw compressor. One end of the transmission device is connected to the gas drive pipeline, and the other end is connected to the lubricating oil driven pipeline. The oil-gas transmission system uses the gaseous refrigerant in the exhaust pipeline to drive the lubricating oil in the return oil pipeline for return oil flow. This exhaust system uses the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow. The higher the compressor speed, the greater the oil supply, perfectly meeting the requirement of a larger amount of refrigerant oil at higher compressor speeds. Therefore, this invention uses the kinetic energy of the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow, providing corresponding oil flow and pressure under different operating conditions, ensuring sufficient lubrication, cooling, and sealing effects for the unit under various conditions. At the same time, when used properly, replacing the oil pump function avoids the wear and tear on the oil pump caused by continuous operation, reduces the power consumption of the oil pump, lowers the operating cost, extends the service life of the oil pump, and improves the energy efficiency and operational stability of the compressor, especially the open screw compressor. Example 3

[0054] As shown above, the refrigerant oil supply system of the air conditioning unit where the open screw compressor is located mainly consists of an oil pump, an oil-gas transmission system (composed of a turbine, a sealed transmission shaft, a pump wheel, and a sealed housing), a pressure sensor, a check valve, a solenoid valve, etc. The number and size of the oil pump, turbine, and pump wheel blades are designed according to the required oil supply of the unit.

[0055] Based on the above-mentioned air conditioning unit, in the preferred embodiment 3 of the present invention, an air conditioning unit control method is provided, which is applied to the air conditioning unit in the above embodiment 2.

[0056] Specifically Figure 2 An optional flowchart of the method is shown, such as Figure 2 As shown, the method includes the following steps S202-S206:

[0057] S202: Detects the current return oil pressure of the open-type screw compressor;

[0058] S204: Obtain the preset range of return oil pressure for an open screw compressor;

[0059] S206: Control the oil supply system to return oil according to the current return oil pressure and the preset range of return oil pressure.

[0060] In the above embodiments, an adaptive oil supply system is provided for supplying oil to an open-type screw compressor. This system includes an oil-gas transmission system, comprising a gas drive pipeline, a transmission device, and a lubricating oil driven pipeline. The gas drive pipeline is connected to the exhaust pipeline of the open-type screw compressor. One end of the transmission device is connected to the gas drive pipeline, and the other end is connected to the lubricating oil driven pipeline. The oil-gas transmission system uses the gaseous refrigerant in the exhaust pipeline to drive the lubricating oil in the return oil pipeline for return oil flow. This exhaust system uses the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow. The higher the compressor speed, the greater the oil supply, perfectly meeting the requirement of a larger amount of refrigerant oil at higher compressor speeds. Therefore, this invention uses the kinetic energy of the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow, providing corresponding oil flow and pressure under different operating conditions, ensuring sufficient lubrication, cooling, and sealing effects for the unit under various conditions. At the same time, when used properly, replacing the oil pump function avoids the wear and tear on the oil pump caused by continuous operation, reduces the power consumption of the oil pump, lowers the operating cost, extends the service life of the oil pump, and improves the energy efficiency and operational stability of the compressor, especially the open screw compressor.

[0061] Preferably, before detecting the current return oil pressure of the open-type screw compressor, the method further includes: controlling the oil pump of the oil supply system to start after the air conditioning unit is turned on; controlling the open-type screw compressor to start after a preset time after the oil pump starts; and triggering the detection of the current return oil pressure of the open-type screw compressor after it starts.

[0062] Before starting an open-type screw compressor refrigeration unit, the oil pump is started first to pre-lubricate the moving parts of the compressor, reducing dry friction during startup and maintaining stable unit operation. After the compressor starts, low-pressure refrigerant enters the compressor through the suction port, is compressed into a high-temperature, high-pressure gas, and enters the oil separator to separate the refrigeration oil and refrigerant. The solenoid valve closes, and the separated refrigerant enters the condenser for cooling via the turbine. The turbine is driven by the high-pressure refrigerant, which in turn drives the pump impeller via a sealed drive shaft.

[0063] After the open-type screw compressor is started, the oil supply system is controlled to return oil according to the current return oil pressure and the preset range of return oil pressure. This includes: when the current return oil pressure is less than the minimum value of the preset range of return oil pressure, the oil pump is kept on; when the current return oil pressure is greater than or equal to the minimum value of the preset range of return oil pressure but less than the maximum value of the preset range of return oil pressure, the oil pump is gradually unloaded; when the current return oil pressure is greater than the maximum value of the preset range of return oil pressure, the oil pump is checked to see if it has stopped, and after the oil pump stops, the bypass solenoid valve of the oil supply system is opened.

[0064] By adding a minimum oil pressure parameter Pl to the unit control, which is the minimum value of the preset range of return oil pressure, and a maximum oil pressure parameter Ph, which is the maximum value of the preset range of return oil pressure, as the compressor is loaded, the refrigerant flow and refrigerant pressure gradually increase, the speed of the turbine and pump wheel also increases, and the pressure of the pump wheel on the refrigeration oil gradually increases.

[0065] At this time, if the compressor oil return port pressure P is less than Pl, the oil pump remains on and the compressor continues to load.

[0066] If Ph > P ≥ Pl, the oil pump will gradually unload from 100% to 0%.

[0067] If P > Ph and the oil pump is in a stopped state, the main solenoid valve of the compressor exhaust pipe opens, and the turbine speed decreases due to the exhaust bypass, thereby reducing the oil pump speed and oil pressure to prevent excessive oil supply from causing liquid to carry over into the compressor.

[0068] The higher the compressor speed, the greater the amount of refrigerant oil required. This invention uses the kinetic energy of the high-temperature and high-pressure refrigerant gas in the exhaust to drive the oil flow. That is, the higher the compressor load, the greater the amount of oil supplied. With reasonable control methods, it can replace part of the oil pump power consumption, resulting in lower operating costs. It can provide corresponding oil flow and oil pressure under different operating conditions, thereby improving the system's energy efficiency and stability. Example 4

[0069] Based on the air conditioning unit control method provided in Embodiment 3 above, in a preferred embodiment 4 of the present invention, a storage medium containing computer-executable instructions is also provided, wherein the computer-executable instructions are used to execute the air conditioning unit control method as described above when executed by a computer processor.

[0070] In the above embodiments, an adaptive oil supply system is provided for supplying oil to an open-type screw compressor. This system includes an oil-gas transmission system, comprising a gas drive pipeline, a transmission device, and a lubricating oil driven pipeline. The gas drive pipeline is connected to the exhaust pipeline of the open-type screw compressor. One end of the transmission device is connected to the gas drive pipeline, and the other end is connected to the lubricating oil driven pipeline. The oil-gas transmission system uses the gaseous refrigerant in the exhaust pipeline to drive the lubricating oil in the return oil pipeline for return oil flow. This exhaust system uses the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow. The higher the compressor speed, the greater the oil supply, perfectly meeting the requirement of a larger amount of refrigerant oil at higher compressor speeds. Therefore, this invention uses the kinetic energy of the high-temperature, high-pressure refrigerant gas from the exhaust to drive the oil flow, providing corresponding oil flow and pressure under different operating conditions, ensuring sufficient lubrication, cooling, and sealing effects for the unit under various conditions. At the same time, when used properly, replacing the oil pump function avoids the wear and tear on the oil pump caused by continuous operation, reduces the power consumption of the oil pump, lowers the operating cost, extends the service life of the oil pump, and improves the energy efficiency and operational stability of the compressor, especially the open screw compressor.

[0071] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0072] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0073] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0074] 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 units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0075] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0076] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0077] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented by the invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0078] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. An oil supply system, characterized in that, Used for supplying oil to an open-type screw compressor, the open-type screw compressor including an exhaust line and an oil return line; The oil supply system includes: An oil-gas transmission system includes: a gas drive pipeline, a transmission device, and a lubricating oil driven pipeline. The gas drive pipeline is connected to the exhaust pipeline of the open screw compressor. One end of the transmission device is connected to the gas drive pipeline, and the other end is connected to the lubricating oil driven pipeline. The oil-gas transmission system is used to drive the lubricating oil in the return oil pipeline to return oil using the gaseous refrigerant in the exhaust pipeline. The transmission device includes: A steam turbine is located on the gas drive pipeline, and the steam turbine is driven by the gaseous refrigerant in the exhaust pipeline. The pump impeller is located on the lubricating oil driven pipeline and is used to drive the lubricating oil in the return oil pipeline to flow. The drive shaft is connected at one end to the steam turbine and at the other end to the pump wheel, and is used to drive the pump wheel to operate using the steam turbine.

2. The oil supply system according to claim 1, characterized in that, Also includes: A bypass solenoid valve is located on the exhaust pipe; The inlet end of the gas-driven pipeline is connected to the inlet end of the bypass solenoid valve, and the outlet end of the gas-driven pipeline is connected to the outlet end of the bypass solenoid valve.

3. The oil supply system according to claim 1, characterized in that, Also includes: An oil pump is located on the pipeline on which the lubricating oil is driven; The inlet end of the lubricating oil driven pipeline is connected to the inlet end of the oil pump, and the outlet end of the lubricating oil driven pipeline is connected to the outlet end of the oil pump.

4. The oil supply system according to claim 3, characterized in that, Also includes: A pressure sensor, located at the oil return port of the open screw compressor, is used to detect the oil return pressure of the open screw compressor; A check valve is located at the outlet end of the lubricating oil driven pipeline to prevent the lubricating oil in the lubricating oil driven pipeline from flowing back.

5. An air conditioning unit, characterized in that, Includes the oil supply system as described in any one of claims 1 to 4, and the open-type screw compressor.

6. The air conditioning unit according to claim 5, characterized in that, The air conditioning unit also includes: An oil separator is located at the discharge port of the open screw compressor; wherein, the bypass solenoid valve of the oil supply system is located on the pipeline between the oil separator and the condenser of the air conditioning unit; An oil cooler is connected at one end to the lubricating oil outlet of the oil separator and at the other end to the oil return port of the open screw compressor; wherein, the oil pump of the oil supply system is located on the pipeline between the oil cooler and the oil return port of the open screw compressor.

7. An air conditioning unit control method, applied to an air conditioning unit as described in any one of claims 5 to 6, characterized in that, The method includes: Detect the current return oil pressure of the open-type screw compressor; Obtain the preset range of return oil pressure for the open-type screw compressor; The oil supply system is controlled to return oil based on the current return oil pressure and the preset range of the return oil pressure.

8. The method according to claim 7, characterized in that, Before detecting the current return oil pressure of the open-type screw compressor, the method further includes: After the air conditioning unit is turned on, the oil pump of the oil supply system is controlled to start. After a preset time has elapsed since the oil pump was turned on, the open-type screw compressor is controlled to start. After the open-type screw compressor is turned on, the current return oil pressure of the open-type screw compressor is detected.

9. The method according to claim 8, characterized in that, Controlling the oil supply system to return oil based on the current return oil pressure and the preset range of the return oil pressure includes: When the current return oil pressure is less than the minimum value of the preset range of return oil pressure, the oil pump is controlled to remain on. When the current return oil pressure is greater than or equal to the minimum value of the preset range of return oil pressure and less than the maximum value of the preset range of return oil pressure, the oil pump is controlled to gradually unload. When the current return oil pressure is greater than the maximum value of the preset range of return oil pressure, the system detects whether the oil pump has stopped, and controls the bypass solenoid valve of the oil supply system to open after the oil pump stops.

10. A storage medium containing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a computer processor, are used to perform the air conditioning unit control method as described in any one of claims 7 to 9.

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