An oxygen generator air compressor double oil pump oil pressure self-adaptive automatic control system and method

Abstract

This invention belongs to the field of oxygen generator air compressor control technology, specifically disclosing a dual-oil-pump adaptive automatic control system for an oxygen generator air compressor. The system includes an oil tank, a main oil pump, an auxiliary oil pump, an oil pressure detection module, a frequency converter drive module, and a programmable logic controller (PLC). The oil inlets of both the main and auxiliary oil pumps are connected to the oil tank, and their outlets are connected to the main oil circuit of the air compressor via check valves. The oil pressure detection module is located in the main oil circuit to detect the actual oil pressure value in real time. The frequency converter drive module is connected to the drive motors of both the main and auxiliary oil pumps to independently adjust their speeds. The PLC is communicatively connected to both the oil pressure detection module and the frequency converter drive module. This invention solves the problems of large oil pressure fluctuations, untimely fault switching, high modification costs of existing advanced technologies, inability to adapt to oil temperature changes, lack of shaft temperature protection, and high energy consumption during oil pump operation in traditional oxygen generator air compressor oil pump control modes.

Description

Technical Field

[0001] This invention relates to the field of oxygen generator air compressor control technology, specifically to an automatic control system and method for adaptive oil pressure of a dual oil pump in an oxygen generator air compressor. Background Technology

[0002] Oxygen-generating air compressors are core power equipment in industries such as metallurgy and chemical engineering. The stability of oil pressure in their oil lubrication system directly affects the operational safety and service life of the equipment. Dual oil pump configurations are the mainstream design for oil lubrication systems. The industry is placing increasingly higher demands on the precision of oil pump control, the timeliness of fault response, energy efficiency, and adaptability for retrofitting. Adaptive intelligent control of oil pressure has become an important development direction in this technological field.

[0003] A search revealed that, according to publication number CN114060252A, an automatic oil injection and lubrication device for an air compressor is described. This device features an oil injection hole radially disposed at the lower end of the air compressor cylinder. The oil injection hole is connected to the outlet end of an oil injection pump via a pipe, and the inlet end of the oil injection pump is connected to an oil storage tank. The oil injection pump is connected to a controller. The advantages of this invention are: the addition of an oil injection hole at the lower part of the cylinder improves lubrication; the use of a PLC to control the oil injection pump allows for timed and quantitative lubrication, ensuring safe operation of the cylinder and preventing damage to the equipment due to negligence during manual operation.

[0004] However, this device only achieves timed and quantitative oil injection control for a single oil pump, lacking real-time oil pressure detection and dynamic adjustment functions. It cannot adjust the oil injection quantity and pressure according to the actual operating conditions of the air compressor, easily leading to over- or under-lubrication. Furthermore, the device lacks oil pump fault monitoring and backup switching mechanisms; a single oil pump failure will directly cause lubrication interruption, leading to cylinder wear and even equipment shutdown. Simultaneously, it does not consider the impact of lubricating oil temperature changes on lubrication effectiveness. When oil temperature rises and lubricating oil viscosity decreases, it cannot specifically increase oil pressure to ensure lubrication. In operating conditions like oxygen-generating air compressors, which require higher oil circuit stability, it is difficult to adapt to continuous, high-load operation demands and cannot optimize oil pump energy consumption. The overall reliability and adaptability of the oil circuit system are significantly limited. While advanced domestic and international oil pump control technologies can improve control performance, they require high-precision sensing equipment and replacement of the entire control system, resulting in high procurement, debugging, and maintenance costs that most companies cannot afford. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an adaptive automatic control system and method for dual oil pumps in oxygen-generating air compressors. This system solves the problems of large oil pressure fluctuations and untimely fault switching in traditional oxygen-generating air compressor oil pump control modes, high cost of retrofitting existing advanced technologies, inability of existing technologies to adapt to oil temperature changes, lack of shaft temperature protection, and high energy consumption of oil pump operation.

[0006] To achieve the above objectives, the basic solution provided by this invention is: a dual-oil-pump adaptive automatic control system for an oxygen generator air compressor, comprising: The system includes an oil tank, a main oil pump, and an auxiliary oil pump. The oil inlets of both the main oil pump and the auxiliary oil pump are connected to the oil tank, and their oil outlets are connected to the main oil circuit of the air compressor via check valves. An oil pressure detection module is installed in the main oil circuit to detect the actual oil pressure value of the main oil circuit in real time. The variable frequency drive module is connected to the drive motor of the main oil pump and the drive motor of the auxiliary oil pump respectively, and is used to independently adjust the speed of the main oil pump and the speed of the auxiliary oil pump. A programmable logic controller (PLC) is communicatively connected to the oil pressure detection module and the variable frequency drive module, respectively. The PLC is configured to: acquire the actual oil pressure value and compare the actual oil pressure value with a preset target oil pressure range. When the actual oil pressure value is lower than the lower limit of the target oil pressure range and the duration reaches the first preset time, it is determined whether the current frequency of the main oil pump is lower than the power frequency. If so, the variable frequency drive module is controlled to increase the speed of the main oil pump to the power frequency. When the speed of the main oil pump increases to the power frequency, and the actual oil pressure value is still lower than the lower limit of the target oil pressure range for a duration of a second preset time, the variable frequency drive module is controlled to start the auxiliary oil pump and run at a preset initial frequency. When the actual oil pressure value is higher than the upper limit of the target oil pressure range and the duration reaches the third preset time, it is determined whether the auxiliary oil pump is in operation. If so, the variable frequency drive module is controlled to reduce the speed of the auxiliary oil pump or stop the auxiliary oil pump. If not, and the speed of the main oil pump is higher than the preset minimum operating speed, the speed of the main oil pump is reduced so that the actual oil pressure value falls back to the target oil pressure range.

[0007] Preferably, the programmable logic controller is further configured to: When the auxiliary oil pump is started, the current operating status, speed and corresponding actual oil pressure value of the main oil pump, as well as the current operating status, speed and corresponding actual oil pressure value of the auxiliary oil pump, are recorded as an operating dataset. Based on the aforementioned operational dataset, an adaptive control algorithm is employed to dynamically adjust the speed distribution strategy between the main oil pump and the auxiliary oil pump, thereby minimizing the total energy consumption of the main oil pump and the auxiliary oil pump while meeting oil pressure requirements.

[0008] Preferably, the adaptive control algorithm is a fuzzy control algorithm or a model predictive control algorithm; the programmable logic controller optimizes the parameters of the fuzzy control rules or predictive model in real time according to the running dataset, so that the main oil pump and the auxiliary oil pump operate on the optimal efficiency curve.

[0009] Preferably, the system further includes: An oil temperature detection module is installed in the oil tank or the main oil circuit to detect the real-time temperature of the lubricating oil. The programmable logic controller is also connected to the oil temperature detection module and is further configured to: The target oil pressure range is dynamically corrected based on the real-time temperature, wherein when the real-time temperature increases, the lower limit and / or upper limit of the target oil pressure range are increased accordingly.

[0010] Preferably, the system further includes: The fault self-diagnosis module, connected to the programmable logic controller, is used to monitor the operating status of the main oil pump and the auxiliary oil pump in real time. When a fault is detected in the currently operating main oil pump or the auxiliary oil pump, the programmable logic controller controls the frequency converter drive module to immediately start the backup oil pump and issue an alarm signal.

[0011] An adaptive automatic control method for oil pressure of a dual-oil-pump oxygen generator compressor includes the following steps: Step S1: Real-time detection of the actual oil pressure value of the air compressor's main oil circuit; Step S2: Compare the actual oil pressure value with the preset target oil pressure range; Step S3: When the actual oil pressure value is lower than the lower limit of the target oil pressure range and the duration reaches the first preset time, determine whether the current frequency of the main oil pump is lower than the power frequency. If so, increase the speed of the main oil pump to the power frequency. Step S4: When the speed of the main oil pump increases to the power frequency, and the actual oil pressure value is still lower than the lower limit of the target oil pressure range for a duration of the second preset time, the auxiliary oil pump is started and runs at a preset initial frequency. Step S5: When the actual oil pressure value is higher than the upper limit of the target oil pressure range and the duration reaches the third preset time, determine whether the auxiliary oil pump is running. If yes, reduce the speed of the auxiliary oil pump or stop the auxiliary oil pump. If no, and the speed of the main oil pump is higher than the preset minimum operating speed, reduce the speed of the main oil pump.

[0012] Preferably, after step S4, the method further includes step S4.1: recording the operating data set of the main oil pump and the auxiliary oil pump; based on the operating data set, dynamically optimizing the speed distribution of the main oil pump and the auxiliary oil pump through an adaptive control algorithm to achieve the dual objectives of stable oil pressure and minimum energy consumption.

[0013] Preferably, before step S2, the method further includes step S2.0: detecting the real-time temperature of the lubricating oil; and dynamically adjusting the target oil pressure range based on the real-time temperature to adapt to lubrication requirements at different oil temperatures.

[0014] Compared with the prior art, the present invention has the following advantages: 1. This invention dynamically corrects the target oil pressure range based on the real-time temperature of the lubricating oil, and independently adjusts the speed of the main and auxiliary oil pumps by combining the variable frequency drive module to adapt to the lubrication requirements under different oil temperatures. This solves the problems of traditional control methods being unable to adjust oil pressure according to oil temperature and having insufficient control accuracy. At the same time, it optimizes the oil pump speed distribution by relying on the adaptive control algorithm, thereby effectively reducing the total energy consumption of the oil pump while meeting the oil pressure requirements of the oil circuit, and improving the economic efficiency of system operation.

[0015] 2. This invention achieves data fusion with the existing system through modular DCS expansion and OPC interface, without replacing the entire control system. It balances the upgrade of control functions with cost control of transformation. It solves the problems of untimely switching and poor oil pressure stability in the traditional one-master-one-standby control mode, and avoids the drawbacks of high investment required by existing advanced technologies. It is suitable for the upgrade and transformation needs of existing equipment of enterprises.

[0016] 3. This invention, through a fault self-diagnosis module, can monitor the operating status of the main and auxiliary oil pumps in real time. When an oil pump malfunctions, it can automatically start the backup pump and issue an alarm signal, achieving rapid response and handling of faults. Combined with the control logic of delayed operation of the oil pump after equipment shutdown, the equipment can be shut down only after the shaft temperature drops to the allowable range. This solves the problems of slow fault response and easy component wear caused by a sudden drop in shaft temperature after equipment shutdown in traditional systems, extending the overall service life of the equipment and reducing maintenance frequency. Attached Figure Description

[0017] Figure 1 This is a system block diagram of the present invention; Figure 2 This is a flowchart of the method of the present invention. Detailed Implementation

[0018] The present invention will be further described in detail below through specific embodiments: Example 1 like Figure 1As shown: This embodiment of the invention provides a dual-oil-pump oil pressure adaptive automatic control system for an oxygen-generating air compressor, applied to the oil circuit lubrication control of the oxygen-generating air compressor, adapting to the oil pressure detection requirements of a range of 0-0.6MPa, with preset dual oil pressure thresholds of 0.18MPa and 0.38MPa. The system specifically includes an oil tank, a main oil pump, an auxiliary oil pump, an oil pressure detection module, a frequency converter drive module, a programmable logic controller, an oil temperature detection module, and a fault self-diagnosis module.

[0019] Both the main oil pump and the auxiliary oil pump have their inlets connected to the oil tank via pipelines, and their outlets are connected to check valves before being routed into the main oil circuit of the air compressor. The check valves prevent lubricating oil in the main oil circuit from flowing back to the oil pumps, ensuring stable oil pressure. The oil pressure detection module is a pressure transmitter installed at key monitoring points in the main oil circuit, continuously collecting the actual oil pressure value and transmitting the signal to the programmable logic controller (PLC). The variable frequency drive module has two independent variable frequency control units, electrically connected to the drive motors of the main oil pump and the auxiliary oil pump, respectively. These units allow for independent adjustment of the frequency of the two pump drive motors, thus enabling individual control of the main and auxiliary oil pump speeds.

[0020] The programmable logic controller (PLC) establishes communication connections with both the oil pressure detection module and the frequency converter drive module. Its built-in control program can receive and analyze oil pressure signals and issue speed adjustment commands based on oil pressure changes. When the oil pressure detection module detects that the actual oil pressure value is lower than 0.18 MPa and this state persists for a first preset time, the PLC first determines whether the current operating frequency of the main oil pump is lower than the power frequency. If the determination result is yes, it sends a command to the frequency converter drive module, which increases the speed of the main oil pump to the power frequency. If, after the main oil pump speed is increased to the power frequency, the actual oil pressure value is still lower than 0.18 MPa and this state persists for a second preset time, the PLC will control the frequency converter drive module to start the auxiliary oil pump. The auxiliary oil pump operates at a preset initial frequency to jointly provide pressure for the oil circuit. When the actual oil pressure is higher than 0.38MPa and this state continues for a third preset time, the programmable logic controller first determines whether the auxiliary oil pump is running. If the auxiliary oil pump is running, it controls the frequency converter to gradually reduce the speed of the auxiliary oil pump. If the oil pressure still exceeds the upper limit after reducing the speed, the auxiliary oil pump is stopped directly. If the auxiliary oil pump is not running and the current speed of the main oil pump is higher than the preset minimum operating speed, it controls the frequency converter to reduce the speed of the main oil pump until the actual oil pressure drops back to the target range of 0.18MPa-0.38MPa.

[0021] The oil temperature detection module is a temperature sensor installed at the oil outlet of the oil tank. It detects the real-time temperature of the lubricating oil and transmits the temperature signal to the programmable logic controller (PLC). The PLC has a built-in correlation correction program between temperature and oil pressure range. When the detected real-time temperature of the lubricating oil rises, the lower and upper limits of the target oil pressure range will be increased accordingly to adapt to the lubrication requirements of the lubricating oil at high temperatures and avoid insufficient lubrication caused by the decrease in lubricating oil viscosity due to increased oil temperature. When the oil temperature drops, the target oil pressure range will be adjusted back to the initial value to ensure that the oil pressure matches the performance of the lubricating oil.

[0022] The fault self-diagnosis module is electrically connected to the programmable logic controller (PLC) and continuously collects signals such as operating current, speed, and start / stop status of the main and auxiliary oil pumps, enabling real-time monitoring of the operating status of both pumps. When the fault self-diagnosis module detects a fault in the currently operating main or auxiliary oil pump, it transmits the fault signal to the PLC. The PLC immediately sends a command to the frequency converter drive module to start the backup oil pump and simultaneously triggers an audible and visual alarm to alert personnel to promptly repair the faulty pump.

[0023] Furthermore, the programmable logic controller (PLC) has a built-in data recording and algorithm calculation unit. When the auxiliary oil pump starts, this unit continuously records the current operating status, speed, and corresponding actual oil pressure value of both the main and auxiliary oil pumps, forming a complete operating dataset. The PLC pre-stores a fuzzy control algorithm. Based on the real-time updated operating dataset, this algorithm dynamically adjusts the speed allocation strategy between the main and auxiliary oil pumps, optimizing the parameters of the fuzzy control rules in real time. This ensures that both pumps always operate on their optimal efficiency curves, minimizing the total energy consumption of both pumps while meeting the oil pressure requirements of the air compressor's main oil circuit. Alternatively, the fuzzy control algorithm can be replaced with a model predictive control algorithm. By analyzing the operating dataset and optimizing the parameters of the predictive model, the optimal allocation of pump speeds and the minimization of energy consumption can also be achieved.

[0024] The system in this embodiment is built on the basis of retaining the original electrical interlock structure. It achieves data fusion with the existing DCS system through the OPC interface, without the need to replace the entire control system, which greatly reduces the equipment modification cost, while realizing precise and adaptive control of hydraulic pressure.

[0025] Example 2 like Figure 2 As shown, this embodiment provides a dual-oil-pump adaptive automatic control method for oxygen-generating air compressors, which is implemented using the dual-oil-pump adaptive automatic control system for oxygen-generating air compressors described in Embodiment 1. This method is adapted to the oil circuit lubrication control of the oxygen-generating air compressor, with a preset oil pressure target range of 0.18MPa-0.38MPa. The method specifically includes the following steps: Step S1: The oil pressure detection module installed in the main oil circuit of the air compressor detects the actual oil pressure value in the main oil circuit in real time, and the oil pressure detection module continuously transmits the collected oil pressure signal to the programmable logic controller.

[0026] Step S2.0: The real-time temperature of the lubricating oil is detected by an oil temperature detection module installed at the oil outlet of the oil tank. The oil temperature detection module transmits the temperature signal to the programmable logic controller (PLC). The PLC dynamically corrects the preset target oil pressure range of 0.18MPa-0.38MPa based on the received real-time temperature. When the real-time temperature rises, the lower and upper limits of the target oil pressure range are increased accordingly. When the real-time temperature falls, the target oil pressure range is adjusted back to adapt to the lubrication requirements of the lubricating oil at different oil temperatures.

[0027] Step S2: The programmable logic controller compares the received actual oil pressure value with the target oil pressure range after dynamic correction in step S2.0 in real time to determine whether the actual oil pressure value is within the target range.

[0028] Step S3: When the programmable logic controller determines that the actual oil pressure value is lower than the lower limit of the target oil pressure range, and the duration of the low oil pressure state reaches the first preset time, it immediately determines whether the current operating frequency of the main oil pump is lower than the power frequency. If the determination result is yes, it sends an instruction to the frequency converter drive module to increase the speed of the main oil pump until the speed of the main oil pump reaches the power frequency.

[0029] Step S4: If the speed of the main oil pump is increased to the power frequency after step S3, and the actual oil pressure value detected by the oil pressure detection module is still lower than the lower limit of the target oil pressure range, and the duration of this state reaches the second preset time, the programmable logic controller sends a start command to the frequency converter drive module to start the auxiliary oil pump. The auxiliary oil pump runs at a preset initial frequency and works with the main oil pump to provide pressure for the oil circuit.

[0030] Step S4.1: After the auxiliary oil pump starts, the programmable logic controller (PLC) continuously records the operating status, speed, and corresponding actual oil pressure value of the main oil pump, and simultaneously records the operating status, speed, and corresponding actual oil pressure value of the auxiliary oil pump, forming a real-time updated operating dataset. Based on this operating dataset, a fuzzy control algorithm is used to dynamically optimize the speed distribution between the main and auxiliary oil pumps, optimizing the parameters of the fuzzy control rules in real time to ensure that the main and auxiliary oil pumps operate on the optimal efficiency curve. Alternatively, a model predictive control algorithm can be used, which dynamically adjusts the speed distribution by optimizing the parameters of the predictive model. Ultimately, while meeting the oil pressure requirements of the air compressor's main oil circuit, the total energy consumption of the main and auxiliary oil pumps is minimized, achieving the dual control objectives of stable oil pressure and minimum energy consumption.

[0031] Step S5: When the programmable logic controller determines that the actual oil pressure value is higher than the upper limit of the target oil pressure range, and the duration of the high oil pressure state reaches the third preset time, it first determines whether the auxiliary oil pump is running. If the auxiliary oil pump is running, it controls the frequency converter drive module to gradually reduce the speed of the auxiliary oil pump. If the oil pressure still exceeds the upper limit after reducing the speed, the auxiliary oil pump is stopped directly. If the auxiliary oil pump is not running, and the current speed of the main oil pump is higher than the preset minimum operating speed, it controls the frequency converter drive module to reduce the speed of the main oil pump. Through the above regulation, the actual oil pressure value is brought back to the target oil pressure range.

[0032] During the execution of the above steps, the fault self-diagnosis module continuously monitors the operating status of the main oil pump and the auxiliary oil pump. When a fault is detected in the currently operating main oil pump or auxiliary oil pump, the fault signal is transmitted to the programmable logic controller. The programmable logic controller immediately controls the frequency converter drive module to start the backup oil pump and issues an alarm signal to ensure a continuous and stable supply of oil pressure.

[0033] The method in this embodiment can be implemented through on-site configuration and control program writing of existing DCS control systems, without the need to build a brand-new control platform. While achieving adaptive and precise control of oil pressure, it effectively controls the transformation cost. Moreover, the control logic is clear and the response speed is fast. It can effectively solve the problems of large oil pressure fluctuation and untimely switching in the traditional one-main-one-standby oil pump control mode, and improve the operational stability of the oxygen generator air compressor oil circuit system.

[0034] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A dual-oil-pump adaptive automatic control system for an oxygen-generating air compressor, characterized in that, It includes an oil tank, a main oil pump, and an auxiliary oil pump. The oil inlets of the main oil pump and the auxiliary oil pump are both connected to the oil tank, and the oil outlets of both are connected to the main oil circuit of the air compressor through a one-way valve. An oil pressure detection module is installed in the main oil circuit to detect the actual oil pressure value of the main oil circuit in real time. The variable frequency drive module is connected to the drive motor of the main oil pump and the drive motor of the auxiliary oil pump respectively, and is used to independently adjust the speed of the main oil pump and the speed of the auxiliary oil pump. A programmable logic controller (PLC) is communicatively connected to the oil pressure detection module and the variable frequency drive module, respectively. The PLC is configured to: acquire the actual oil pressure value and compare the actual oil pressure value with a preset target oil pressure range. When the actual oil pressure value is lower than the lower limit of the target oil pressure range and the duration reaches the first preset time, it is determined whether the current frequency of the main oil pump is lower than the power frequency. If so, the variable frequency drive module is controlled to increase the speed of the main oil pump to the power frequency. When the speed of the main oil pump increases to the power frequency, and the actual oil pressure value is still lower than the lower limit of the target oil pressure range for a duration of a second preset time, the variable frequency drive module is controlled to start the auxiliary oil pump and run at a preset initial frequency. When the actual oil pressure value is higher than the upper limit of the target oil pressure range and the duration reaches the third preset time, it is determined whether the auxiliary oil pump is in operation. If so, the variable frequency drive module is controlled to reduce the speed of the auxiliary oil pump or stop the auxiliary oil pump. If not, and the speed of the main oil pump is higher than the preset minimum operating speed, the speed of the main oil pump is reduced so that the actual oil pressure value falls back to the target oil pressure range.

2. The automatic control system for adaptive oil pressure of a dual oil pump in an oxygen generator air compressor according to claim 1, characterized in that... The programmable logic controller is further configured to: When the auxiliary oil pump is started, the current operating status, speed and corresponding actual oil pressure value of the main oil pump, as well as the current operating status, speed and corresponding actual oil pressure value of the auxiliary oil pump, are recorded as an operating dataset. Based on the aforementioned operational dataset, an adaptive control algorithm is employed to dynamically adjust the speed distribution strategy between the main oil pump and the auxiliary oil pump, thereby minimizing the total energy consumption of the main oil pump and the auxiliary oil pump while meeting oil pressure requirements.

3. The automatic control system for adaptive oil pressure of a dual oil pump in an oxygen generator air compressor according to claim 2, characterized in that, The adaptive control algorithm is a fuzzy control algorithm or a model predictive control algorithm; the programmable logic controller optimizes the parameters of the fuzzy control rules or predictive model in real time according to the running dataset, so that the main oil pump and the auxiliary oil pump operate on the optimal efficiency curve.

4. The adaptive automatic control system for dual oil pump oil pressure of an oxygen generator air compressor according to claim 1, characterized in that, The system also includes: An oil temperature detection module is installed in the oil tank or the main oil circuit to detect the real-time temperature of the lubricating oil. The programmable logic controller is also connected to the oil temperature detection module and is further configured to: The target oil pressure range is dynamically corrected based on the real-time temperature, wherein when the real-time temperature increases, the lower limit and / or upper limit of the target oil pressure range are increased accordingly.

5. The adaptive automatic control system for dual oil pump oil pressure of an oxygen generator air compressor according to claim 1, characterized in that, The system also includes: The fault self-diagnosis module, connected to the programmable logic controller, is used to monitor the operating status of the main oil pump and the auxiliary oil pump in real time. When a fault is detected in the currently operating main oil pump or the auxiliary oil pump, the programmable logic controller controls the frequency converter drive module to immediately start the backup oil pump and issue an alarm signal.

6. A method for adaptive automatic control of oil pressure in a dual-oil-pump oxygen generator air compressor, characterized in that, Includes the following steps: Step S1: Real-time detection of the actual oil pressure value of the air compressor's main oil circuit; Step S2: Compare the actual oil pressure value with the preset target oil pressure range; Step S3: When the actual oil pressure value is lower than the lower limit of the target oil pressure range and the duration reaches the first preset time, determine whether the current frequency of the main oil pump is lower than the power frequency. If so, increase the speed of the main oil pump to the power frequency. Step S4: When the speed of the main oil pump increases to the power frequency, and the actual oil pressure value is still lower than the lower limit of the target oil pressure range for a duration of the second preset time, the auxiliary oil pump is started and runs at a preset initial frequency. Step S5: When the actual oil pressure value is higher than the upper limit of the target oil pressure range and the duration reaches the third preset time, determine whether the auxiliary oil pump is running. If yes, reduce the speed of the auxiliary oil pump or stop the auxiliary oil pump. If no, and the speed of the main oil pump is higher than the preset minimum operating speed, reduce the speed of the main oil pump.

7. The method for adaptive automatic control of oil pressure in a dual-oil-pump oxygen compressor according to claim 6, characterized in that, Following step S4, step S4.1 is also included: recording the operating data set of the main oil pump and the auxiliary oil pump; based on the operating data set, dynamically optimizing the speed distribution of the main oil pump and the auxiliary oil pump through an adaptive control algorithm to achieve the dual objectives of stable oil pressure and minimum energy consumption.

8. The adaptive automatic control method for oil pressure of a dual oil pump in an oxygen generator air compressor according to claim 6, characterized in that, Before step S2, there is also step S2.0: detecting the real-time temperature of the lubricating oil; dynamically adjusting the target oil pressure range based on the real-time temperature to adapt to lubrication requirements at different oil temperatures.

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