Compressor unit lubricating oil system control method, device and readable storage medium

Abstract

The application belongs to the field of gas compression stations and discloses a lubricating oil system control method and device for a compressor unit and a readable storage medium. The lubricating oil system control method comprises the following steps: in the process of starting the compressor unit, the lubricating oil system automatically switches from a cold standby state to a hot standby state; when the compressor unit is in the hot standby state, the lubricating oil system selects different cooling working durations according to the working condition of the compressor unit before shutdown; and after the compressor unit is shut down, the lubricating oil system automatically switches to use the first oil pump or the second oil pump according to the oil pump switching condition and the oil pump working duration. The lubricating oil system control method avoids manual starting and human errors, shortens the waiting duration for restarting the compressor unit, and thus solves the problem of unreasonable lubricating oil system control methods for the compressor unit, and achieves the effects of reducing human operation factors, improving the degree of automation, and improving the operation efficiency of the compressor unit.

Description

Methods, devices and readable storage media for controlling the lubrication system of compressor units Technical Field

[0001] This application relates to the field of air compressor station technology, and more specifically to a method, apparatus and readable storage medium for controlling the lubricating oil system of a compressor unit. Background Technology

[0002] A gas compressor station is a station equipped with natural gas pressurization equipment, typically consisting of multiple compressor units connected to the natural gas pipeline network. These compressor units are generally equipped with a lubrication oil system primarily used for lubrication and cooling. The lubrication oil system generally includes a lubrication oil tank, a main oil pump, and a standby oil pump.

[0003] In existing technologies, when a compressor unit is started, each component of the lubrication system needs to be manually started individually. The entire operation requires human intervention and monitoring, which is time-consuming, labor-intensive, and inefficient. Furthermore, operator negligence can lead to prolonged operation of either the main or standby oil pump, affecting the integrity of the lubrication system. After the compressor unit stops, the lubrication system is shut down with a timer delay. Regardless of the compressor unit's operating conditions, the cooling time of the lubrication system remains constant, extending the waiting time for the compressor unit to restart. Summary of the Invention

[0004] The purpose of this application is to provide a method, device, and readable storage medium for controlling the lubricating oil system of a compressor unit, so as to solve the problem of unreasonable control methods for the lubricating oil system of a compressor unit, and achieve the effects of reducing human operation factors, improving automation, and improving the operating efficiency of the compressor unit.

[0005] To achieve the above objectives, the first aspect of this application provides a method for controlling the lubricating oil system of a compressor unit, comprising:

[0006] During the compressor unit startup process, the lubrication system automatically switches from cold standby to hot standby.

[0007] After the compressor unit is shut down, the lubrication system selects different cooling operating durations based on the operating conditions of the compressor unit before shutdown.

[0008] When the compressor unit is in hot standby mode, the lubrication system automatically switches to use either the first or second oil pump based on the oil pump switching conditions and the oil pump operating time.

[0009] In some embodiments, the lubricating oil system switching from a cold standby state to a hot standby state includes: first, starting the oil tank heater to heat the lubricating oil; and then, once the temperature of the lubricating oil in the oil tank is greater than a preset oil temperature, starting the first oil pump or the second oil pump.

[0010] In some embodiments, the operating conditions of the compressor unit include:

[0011] The first operating condition is that the timing control is activated, the frequency converter is not running, and the unit speed is less than the minimum speed.

[0012] The second operating condition is as follows: timing control is activated, frequency converter is running, and unit speed is less than minimum speed; or timing control is activated, frequency converter is running, unit speed is greater than or equal to minimum speed, and anti-surge valve is fully open.

[0013] The third operating condition is as follows: timing control is activated, frequency converter is running, unit speed is greater than or equal to minimum speed, and anti-surge valve is partially open.

[0014] In the first operating condition, the cooling time of the lubricating oil system is 0-5 minutes; in the second operating condition, the cooling time of the lubricating oil system is 10-20 minutes; and in the third operating condition, the cooling time of the lubricating oil system is 25-35 minutes.

[0015] In some embodiments, the oil pump switching conditions include: the compressor unit is stopped, the compressor unit is not in the startup process, the speed of the compressor unit is less than or equal to the preset speed, the compressor unit has not triggered ESD pressure holding shutdown, the compressor unit has not triggered ESD pressure relief shutdown, the inverter stop time is longer than the preset stop time, and the lubricating oil system is in hot standby state.

[0016] When all the oil pump switching conditions are met and the oil pump operating time is greater than or equal to the preset operating time, the lubricating oil system automatically switches to use either the first oil pump or the second oil pump.

[0017] In some embodiments, the lubricating oil system control method further includes: during the compressor unit start-up process, the lubricating oil system verifies the first set of lifting pumps and the second set of lifting pumps, and the lubricating oil system automatically switches between using the first set of lifting pumps or the second set of lifting pumps in a single-cycle alternating manner.

[0018] In some embodiments, the lubricating oil system control method further includes:

[0019] When the ambient temperature is lower than the preset temperature, the oil cooling fan can only be started and stopped manually.

[0020] When the ambient temperature is greater than or equal to the preset temperature, the oil-cooled fan will automatically start and operate at variable speed according to the increase in the temperature of the lubricating oil.

[0021] In some embodiments, the lubricating oil system control method further includes: after the main compressor unit is started, the lubricating oil system of the standby compressor unit automatically switches from a cold standby state to a hot standby state.

[0022] A second aspect of this application provides a control device for a lubricating oil system of a compressor unit, comprising:

[0023] The memory is configured to store instructions;

[0024] The processor is configured to retrieve the instructions from the memory and, when executing the instructions, to implement the aforementioned lubrication system control method.

[0025] In some embodiments, the lubricating oil system control device further includes a human-machine interface for graphically displaying the operating status of the lubricating oil system and manually switching between the cold standby and hot standby states of the lubricating oil system.

[0026] A third aspect of this application provides a readable storage medium storing instructions for causing a machine to perform the above-described lubrication system control method.

[0027] Compared with the prior art, the beneficial effects of this application are as follows:

[0028] This application enables the lubricating oil system to automatically switch from cold standby to hot standby, with adaptive changes in cooling operation time and periodic automatic switching between the first and second oil pumps. This avoids manual start-up and human error, shortens the waiting time for the compressor unit to restart, and thus solves the problem of unreasonable control methods for the compressor unit's lubricating oil system. It achieves the effects of reducing human operation factors, improving automation, and increasing the operating efficiency of the compressor unit.

[0029] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0030] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0031] Figure 1 schematically shows a view of the human-machine interface of the lubricating oil system control device according to an embodiment of the present application in a certain state. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0034] This application provides a method for controlling the lubricating oil system of a compressor unit, including:

[0035] During the compressor unit startup process, the lubrication system automatically switches from cold standby to hot standby.

[0036] After the compressor unit is shut down, the lubrication system selects different cooling operating durations based on the operating conditions of the compressor unit before shutdown.

[0037] When the compressor unit is in hot standby mode, the lubrication system automatically switches to use either the first or second oil pump based on the oil pump switching conditions and the oil pump operating time.

[0038] As shown in Figure 1, the lubricating oil system in this application generally includes: a lubricating oil tank storing lubricating oil, a first oil pump and a second oil pump for pumping lubricating oil, an oil tank heater for heating the lubricating oil, an exhaust fan for discharging oil fumes from inside the lubricating oil tank, an oil-cooled fan for cooling the lubricating oil, and lubrication pipelines for circulating the lubricating oil. The lubricating oil system also includes a control device electrically connecting the various components. The control device is equipped with a control program, including a cold standby program and a hot standby program. In the cold standby state, all components of the lubricating oil system are in a standby state; in the hot standby state, all components of the lubricating oil system are in an operating state, and the lubricating oil system can supply lubricating oil with a certain pressure and temperature to the outside.

[0039] In this application, during the compressor unit startup process, the control device runs a hot standby program, automatically switching the lubricating oil system from cold standby to hot standby without requiring manual restart. After the compressor unit stops, the control device selects different cooling durations based on the compressor unit's operating conditions before shutdown, allowing the lubricating oil system's cooling duration to adapt adaptively. For example, the compressor unit's operating time is directly proportional to the cooling duration; the shorter the compressor unit's operating time, the shorter the cooling duration, thus reducing the average waiting time for the compressor unit to restart. After the compressor unit stops, the control device automatically switches between the first and second oil pumps for the next startup based on the oil pump switching conditions and oil pump operating time, ensuring that the first and second oil pumps are used alternately and avoiding long-term single-pump operation. This application enables the lubricating oil system to automatically switch from cold standby to hot standby, with adaptive changes in cooling operation time and periodic automatic switching between the first and second oil pumps. This avoids manual start-up and human error, shortens the waiting time for the compressor unit to restart, and thus solves the problem of unreasonable control methods for the compressor unit's lubricating oil system. It achieves the effects of reducing human operation factors, improving automation, and increasing the operating efficiency of the compressor unit.

[0040] In some embodiments, the lubricating oil system has three working modes: mode 1 is the state where the oil pump is prohibited from automatic rotation and switching; mode 2 is the state where the oil pump can rotate periodically according to the running time; and mode 3 is the state where the host computer can manually "one-click cold and hot standby switching".

[0041] Specifically, switching the lubricating oil system from cold standby to hot standby involves: first, starting the oil tank heater to heat the lubricating oil; once the temperature of the lubricating oil in the tank exceeds the preset oil temperature, the first or second oil pump starts. The preset oil temperature can be 22°C, at which point the lubricating oil film formed has good rigidity.

[0042] In some embodiments, the control program for the lubricating oil system includes determining the main oil pump and the standby oil pump. When the first oil pump is the main oil pump and the second oil pump is the standby oil pump, if the oil pump switching conditions and oil pump operating time are met, the control program sets the first oil pump as the standby oil pump and the second oil pump as the main oil pump, and vice versa. That is, the control program always starts the main oil pump.

[0043] In some embodiments, the control device of the lubricating oil system receives the start-up command of the compressor unit and then runs a hot standby program, automatically switching the lubricating oil system from a cold standby state to a hot standby state. The oil tank heater and the first or second oil pump continue to operate. Once the temperature of the lubricating oil in the oil tank exceeds 35°C and the post-isolation gas pressure exceeds 0.3 MPa, the control device activates the timing control of the compressor unit, thereby completing the start-up process of the compressor unit. The entire start-up process only requires issuing a start-up command for the compressor unit, greatly reducing human intervention, lowering the risk of misoperation, and significantly improving the operating efficiency of the compressor unit.

[0044] Specifically, the operating conditions of the compressor unit include:

[0045] The first operating condition is that the timing control is activated, the frequency converter is not running, and the unit speed is less than the minimum speed.

[0046] The second operating condition is as follows: timing control is activated, frequency converter is running, and unit speed is less than minimum speed; or timing control is activated, frequency converter is running, unit speed is greater than or equal to minimum speed, and anti-surge valve is fully open.

[0047] The third operating condition is as follows: timing control is activated, frequency converter is running, unit speed is greater than or equal to minimum speed, and anti-surge valve is partially open.

[0048] Under the first operating condition, the cooling time of the lubricating oil system is 0-5 minutes; under the second operating condition, the cooling time of the lubricating oil system is 10-20 minutes; and under the third operating condition, the cooling time of the lubricating oil system is 25-35 minutes.

[0049] In this application, after the compressor unit stops, the lubrication system needs to operate for a delayed period to fully cool the compressor unit and lubricating oil, ensuring equipment safety. After the lubrication system's cooling operation is complete, it typically automatically switches to a cold standby state. Under the first operating condition, the compressor impeller does no work, the compressor unit does not generate significant heat, and the lubricating oil temperature is normal; in this case, the lubrication system's cooling operation time is 0-5 minutes. Under the second operating condition, the compressor impeller's power output is low, the compressor unit's heat generation is low, and the lubricating oil temperature rise is small; in this case, the lubrication system's cooling operation time is 10-20 minutes. Under the third operating condition, the compressor impeller's power output is high, the compressor unit's heat generation is high, and the lubricating oil temperature rise is large; in this case, the lubrication system's cooling operation time is 25-35 minutes. The control device rationally selects the appropriate cooling operation time based on the compressor unit's operating condition before shutdown, ensuring that the lubrication system's cooling operation time corresponds to the compressor unit's actual cooling needs, thereby shortening the average waiting time for the compressor unit to restart and improving the compressor unit's operating efficiency.

[0050] In some embodiments, after the compressor unit stops, under the first operating condition, the lubricating oil system immediately switches to a cold standby state; under the second operating condition, the lubricating oil system cools for 15 minutes and then switches to a cold standby state; under the third operating condition, the lubricating oil system cools for 30 minutes and then switches to a cold standby state.

[0051] Specifically, the oil pump switching conditions include: compressor unit shutdown, compressor unit not in the startup process, compressor unit speed less than or equal to the preset speed, compressor unit not triggering ESD pressure holding shutdown, compressor unit not triggering ESD pressure relief shutdown, inverter shutdown duration exceeding the preset shutdown duration, and lubrication system in hot standby state. When all oil pump switching conditions are met and the oil pump operating time is greater than or equal to the preset operating time, the lubrication system automatically switches to using either the first or second oil pump. The preset speed can be 5 rpm, the preset shutdown duration can be 3 minutes, and the preset operating duration can be 7 days.

[0052] In this application, oil pump switching needs to be performed after the compressor unit is shut down to avoid the impact of oil pressure changes during switching, which could affect the normal operation of the compressor unit. Simultaneously, the lubrication system needs to be in a hot standby state to verify that it can output lubrication as required after switching. The control device tracks the operating time of the first or second oil pump. When the operating time is greater than or equal to a preset operating time and all switching conditions are met, the control device sends a signal and safely switches the first or second oil pump. This allows for periodic rotation of the first or second oil pump, preventing long-term single-pump operation and improving the integrity of the lubrication system.

[0053] Specifically, the lubricating oil system control method also includes: during the compressor unit start-up process, the lubricating oil system verifies the first set of lifting pumps and the second set of lifting pumps, and the lubricating oil system automatically switches between using the first set of lifting pumps or the second set of lifting pumps in a single-cycle alternating manner.

[0054] In this application, when the compressor unit's main shaft speed is low, additional pressure is applied via a lifting pump in the lubrication system to lift the main shaft and prevent damage to the main shaft bearings. The lifting pump typically includes a first set and a second set. The control device can determine whether the lifting pump is working properly by briefly starting and stopping it and obtaining the outlet oil pressure, thereby improving its reliability. Each time the compressor unit starts up, the control device switches between the first and second sets of lifting pumps, for example, if the first set was used last time, the second set will be used next time; this balances the usage time of the lifting pumps and improves their reliability.

[0055] In some embodiments, the control program for the lubricating oil system includes determining whether there is a first group of lifting pumps or a second group of lifting pumps. When the first group of lifting pumps is the primary lifting pump and the second group of lifting pumps is the standby lifting pump, after the lifting pumps stop, the control program sets the first group of lifting pumps as the standby lifting pump and the second group as the primary lifting pump, and vice versa. That is, the control program always starts the primary lifting pump.

[0056] Specifically, the lubricating oil system control method also includes:

[0057] When the ambient temperature is lower than the preset temperature, the oil cooling fan can only be started and stopped manually.

[0058] When the ambient temperature is greater than or equal to the preset temperature, the oil-cooled fan will automatically start and operate at variable speed according to the increase in the temperature of the lubricating oil.

[0059] In this application, an oil cooler is installed on the lubrication pipeline of the lubrication system. The oil cooler is equipped with an oil-cooling fan, which has an automatic oil temperature-speed control mode. When the temperature of the lubricating oil in the oil cooler is greater than or equal to a temperature threshold, the control device automatically starts the oil-cooling fan and sets the fan speed corresponding to the lubricating oil temperature. The oil-cooling fan lowers the lubricating oil temperature, keeping it near the temperature threshold. When the ambient temperature is lower than the preset temperature, the lubricating oil will condense in the oil cooler. If the oil-cooling fan automatically starts again, it will further lower the lubricating oil temperature, causing the lubricating oil to solidify and wax, hindering oil return, and leading to an abnormal increase in the oil supply temperature, posing a risk of shutdown. Therefore, when the ambient temperature is lower than the preset temperature, the control device shuts down the automatic control mode of the oil-cooling fan, and the oil-cooling fan can only be started and stopped manually. When the ambient temperature is greater than or equal to the preset temperature, the control device resumes the automatic control mode of the oil-cooling fan, thereby improving the cooling effectiveness of the oil-cooling fan. The preset temperature can be -10℃. The temperature threshold can be 45℃.

[0060] Specifically, the lubricating oil system control method also includes: after the main compressor unit is started, the lubricating oil system of the standby compressor unit automatically switches from cold standby state to hot standby state.

[0061] In this application, the compressor station typically has multiple compressor units, which are divided into main compressor units and several standby compressor units according to their startup priority. The lubrication systems of different compressor units communicate with each other. After the main compressor unit starts, the lubrication system of the next standby compressor unit that needs to be started automatically switches from cold standby to hot standby, so that the standby compressor unit can be started more quickly when needed, increasing the total power of the compressor units. At the same time, the whole process does not require human intervention, reducing the workload of operation and maintenance personnel and improving the working efficiency of the compressor station.

[0062] In some embodiments, taking four compressor groups with priorities of 1 to 4 as an example, when the compressor station is working, compressor groups with priorities of 1 and 2 always automatically switch to hot standby mode; after compressor group with priority of 1 is started, compressor groups with priorities of 2 and 3 automatically switch to hot standby mode; after compressor groups with priorities of 1 and 2 are started, compressor groups with priorities of 3 and 4 automatically switch to hot standby mode.

[0063] This application embodiment also provides a lubricating oil system control device for a compressor unit, including:

[0064] The memory is configured to store instructions;

[0065] The processor is configured to retrieve instructions from memory and, when executing instructions, to implement the aforementioned lubrication system control method.

[0066] In this application, the lubricating oil system control device improves the automation level of daily maintenance of the lubricating oil system, requiring minimal human intervention, simplifying operation, and avoiding human error. Furthermore, the lubricating oil system control device can flexibly adjust the cooling operating time of the lubricating oil system, shortening the waiting time for the compressor unit to restart. Moreover, the lubricating oil system control device can periodically and automatically switch between the first and second oil pumps, preventing the long-term operation of a single pump and improving the equipment integrity of the lubricating oil system. Furthermore, the lubricating oil system control device can verify the lifting pump and automatically switch between the first and second sets of lifting pumps, balancing the usage time of the lifting pump and improving its reliability. Finally, the lubricating oil system control device can automatically adjust the operating mode of the oil cooling fan according to the ambient temperature, improving the cooling effectiveness of the oil cooling fan.

[0067] In some embodiments, the lubrication system further includes an emergency oil pump for emergency pumping of lubrication oil. The compressor unit's motor is equipped with a motor heater and an external motor cooling system. The lubrication system control unit is also configured to control the start-up and shutdown of the emergency pump, exhaust fan, motor heater, and external motor cooling system, and to provide start-up / shutdown failure alarms.

[0068] As shown in Figure 1, specifically, the lubricating oil system control device also includes a human-machine interface for graphically displaying the operating status of the lubricating oil system and manually switching between the cold standby and hot standby states of the lubricating oil system.

[0069] In some embodiments, the human-machine interface (HMI) is equipped with "Oil System Cold Standby" and "Oil System Hot Standby" buttons, allowing for one-click switching between the cold and hot standby states of the lubricating oil system. This eliminates the need for manual operation of each component of the lubricating oil system, improving the efficiency of maintenance personnel. Furthermore, the HMI also includes a "Oil System Cold / Hot Standby Switching Prohibited" icon. When the compressor unit is started, the "Oil System Cold / Hot Standby Switching Prohibited" icon illuminates in red, rendering the "Oil System Cold Standby" and "Oil System Hot Standby" buttons ineffective; conversely, it illuminates in green, enabling the operation of these buttons.

[0070] This application embodiment also provides a readable storage medium storing instructions for causing a machine to execute the above-described lubricating oil system control method.

[0071] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0072] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0073] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0074] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0075] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0076] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0077] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0078] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0079] The above are merely embodiments of this application and are not intended to limit the scope 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 the claims of this application.

Claims

1. A method for controlling the lubricating oil system of a compressor unit, characterized in that, The lubricating oil system control method includes: during the compressor unit startup process, the lubricating oil system automatically switches from cold standby to hot standby; after the compressor unit stops, the lubricating oil system selects different cooling operating durations according to the compressor unit's operating conditions before shutdown; during compressor unit hot standby, the lubricating oil system automatically switches to use either the first oil pump or the second oil pump according to the oil pump switching conditions and oil pump operating duration; the compressor unit's operating conditions include: first operating condition, timing control activated, inverter not running, unit speed less than minimum speed; second operating condition, timing control activated, inverter running, unit speed less than minimum speed; or timing control activated, inverter running, unit speed greater than or equal to minimum speed, anti-surge valve fully open; third operating condition, timing control activated, inverter running, unit speed greater than or equal to minimum speed, anti-surge valve partially open; the oil pump switching conditions include: the compressor unit does not trigger ESD pressure holding shutdown, and the compressor unit does not trigger ESD pressure relief shutdown.

2. The lubricating oil system control method according to claim 1, characterized in that, The process of switching the lubricating oil system from cold standby to hot standby includes: first, starting the oil tank heater to heat the lubricating oil; and then, once the temperature of the lubricating oil in the oil tank is higher than the preset oil temperature, starting the first oil pump or the second oil pump.

3. The lubricating oil system control method according to claim 1, characterized in that, Under the first operating condition, the cooling time of the lubricating oil system is 0-5 minutes; under the second operating condition, the cooling time of the lubricating oil system is 10-20 minutes; and under the third operating condition, the cooling time of the lubricating oil system is 25-35 minutes.

4. The lubricating oil system control method according to claim 1, characterized in that, The oil pump switching conditions include: the compressor unit is stopped, the compressor unit is not in the startup process, the speed of the compressor unit is less than or equal to the preset speed, the inverter stop time is greater than the preset stop time, and the lubricating oil system is in hot standby state; wherein, when all the oil pump switching conditions are met and the oil pump working time is greater than or equal to the preset working time, the lubricating oil system automatically switches to use the first oil pump or the second oil pump.

5. The lubricating oil system control method according to any one of claims 1 to 4, characterized in that, The lubricating oil system control method further includes: during the compressor unit start-up process, the lubricating oil system verifies the first set of lifting pumps and the second set of lifting pumps, and the lubricating oil system automatically switches between using the first set of lifting pumps or the second set of lifting pumps in a single-cycle alternating manner.

6. The lubricating oil system control method according to any one of claims 1 to 4, characterized in that, The lubricating oil system control method further includes: when the ambient temperature is lower than the preset temperature, the oil cooling fan can only be started and stopped manually; when the ambient temperature is greater than or equal to the preset temperature, the oil cooling fan automatically starts and operates at variable speed according to the increase in the temperature of the lubricating oil.

7. The lubricating oil system control method according to any one of claims 1 to 4, characterized in that, The lubricating oil system control method further includes: after the main compressor unit is started, the lubricating oil system of the standby compressor unit automatically switches from cold standby state to hot standby state.

8. A control device for the lubricating oil system of a compressor unit, characterized in that, The lubricating oil system control device includes: a memory configured to store instructions; and a processor configured to retrieve the instructions from the memory and, when executing the instructions, to implement the lubricating oil system control method according to any one of claims 1 to 7.

9. The lubricating oil system control device according to claim 8, characterized in that, The lubricating oil system control device also includes a human-machine interface for graphically displaying the operating status of the lubricating oil system and manually switching between the cold standby and hot standby states of the lubricating oil system.

10. A readable storage medium, characterized in that, The readable storage medium stores instructions for causing the machine to perform the lubricating oil system control method according to any one of claims 1 to 7.

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