An oil supply device and system

Abstract

The application relates to the technical field of civil aviation hydraulic actuator testing, and discloses an oil source device and system, which comprises: a normal-temperature oil source assembly, the normal-temperature oil source assembly comprising a normal-temperature oil tank and a motor pump and being used for providing normal-temperature hydraulic medium; a high-low-temperature oil source assembly, the high-low-temperature oil source assembly comprising a double-layer heat-insulating oil tank and a hydraulic pump and being used for providing test temperature range hydraulic medium; the normal-temperature oil source assembly and the high-low-temperature oil source assembly are connected through an electromagnetic ball valve and are connected to the same external output interface through a switching valve group, the external output interface is used for connecting a hydraulic actuator to be tested; the high-low-temperature oil source assembly further comprises a servo pressure regulating unit, the servo pressure regulating unit comprises a pressure boosting cylinder, a low-pressure cavity of the pressure boosting cylinder is connected with the hydraulic pump, and a high-pressure cavity is connected with the external output interface. Through a double-stage energy supply architecture, efficient and stable high-pressure and large-flow output and precise regulation and control of temperature and pressure are realized.

Description

Technical Field

[0001] This invention relates to the field of testing technology for hydraulic actuators in civil aviation, and more specifically, to an oil source device and system. Background Technology

[0002] In the research, development, production, and airworthiness verification of civil aviation hydraulic actuators, the oil source testing system is a core ground support device for simulating real flight conditions and assessing the performance and reliability of the actuators.

[0003] As modern civil aircraft develop towards higher pressure, higher power, and higher precision, the working pressure of their hydraulic systems has generally increased to 3,000 psi or even 5,000 psi. Furthermore, the actuators must simultaneously meet the composite testing requirements of high pressure, high flow rate, wide temperature range, and rapid dynamic response in key actions such as landing gear retraction and deflection.

[0004] However, existing oil source testing technologies for civil aviation hydraulic actuators still have limitations. On the one hand, traditional oil sources often employ single-pump direct drive or simple multi-stage pump combination architectures, making it difficult to simultaneously achieve high pressure and high flow instantaneous output capabilities without significantly increasing installed power. This results in either pressure meeting the standard but insufficient flow and slow response during testing, or sufficient flow but drastic pressure fluctuations, failing to truly reproduce the dynamic characteristics of the aircraft hydraulic system under extreme conditions. On the other hand, existing temperature control and pressure generation are often independent or even mutually interfering, lacking an integrated, collaborative closed-loop control mechanism. During long-term high-load testing, oil temperature drift can easily cause changes in medium viscosity, thus affecting pressure stability and the repeatability of test data.

[0005] Invention patent CN106989074A discloses a convection-type rapid temperature control hydraulic oil source system and its control method. It comprises three internal oil tanks: a high-temperature tank maintains a constant high oil temperature, a low-temperature tank maintains a constant low oil temperature, and a mixing tank controls the temperature at the high-temperature and low-temperature inlets according to temperature requirements, mixing in a certain amount of high-temperature or low-temperature hydraulic oil to achieve rapid temperature control. However, its temperature control relies on the passive mixing of high- and low-temperature oils, belonging to open-loop or semi-closed-loop control. It lacks real-time, accurate feedback and dynamic correction capabilities for the temperature of the mixed medium, and is prone to temperature overshoot or steady-state deviation under load fluctuations or environmental changes, making it difficult to meet the requirements of high-precision testing conditions.

[0006] Therefore, there is an urgent need for a new type of oil source testing system that can integrate high-pressure, high-flow, and efficient supply, precise temperature and pressure control, multiple safety guarantees, and flexible and maintainable design to meet the high-fidelity ground verification requirements of civil aviation hydraulic actuators. Summary of the Invention

[0007] In view of this, the present invention proposes an oil source device and system, which aims to solve the technical problem that the oil source system of civil aviation hydraulic actuators is unable to simultaneously achieve high-pressure, high-flow, and efficient supply and temperature and pressure coordinated control, resulting in the inability to reproduce extreme complex working conditions with high fidelity.

[0008] This invention proposes an oil source device, comprising: A room-temperature oil source assembly, comprising a room-temperature oil tank and a motor pump, is used to provide room-temperature hydraulic medium; A high and low temperature oil source assembly, comprising a double-layer insulated oil tank and a hydraulic pump, for providing hydraulic medium for the test temperature range; The ambient temperature oil source component and the high and low temperature oil source component are connected by a solenoid ball valve and connected to the same external output interface through a switching valve group. The external output interface is used to connect the hydraulic actuator to be tested. The high and low temperature oil source assembly also includes a servo pressure regulating unit, which includes a booster cylinder. The low-pressure chamber of the booster cylinder is connected to a hydraulic pump, and the high-pressure chamber is connected to an external output interface.

[0009] Preferably, the oil source device includes a room temperature oil source component comprising: The oil suction port of the motor pump is connected to a normal temperature oil tank; The oil outlet of the electric pump is connected in series with a one-way valve, a filter, and a cooler. The oil outlet of the motor pump is also connected in parallel with an overflow valve and a proportional overflow valve, and the oil drain ports of the overflow valve and the proportional overflow valve return to the normal temperature oil tank. The downstream pipeline of the cooler is connected in parallel with an accumulator and in series with a flow sensor and a pressure sensor. The output pipeline of the ambient temperature oil source component is connected in parallel with an electromagnetic ball valve group and a manual ball valve group.

[0010] Preferably, the oil source device includes a high and low temperature oil source assembly comprising: The hydraulic pump's suction port is connected to a double-layer insulated oil tank, and its outlet is connected in parallel with a built-in relief valve and a proportional relief valve. The hydraulic pump has two outlets: One path connects to the low-pressure chamber of the booster cylinder via a pressure reducing valve, and the other path connects to the oil inlet of the servo valve. The oil outlet of the servo valve is connected to the high-pressure chamber of the booster cylinder via a check valve. The high-pressure output end of the booster cylinder is equipped with a pressure sensor and connected in parallel with a manual ball valve assembly; The double-layer insulated oil tank is equipped with independent refrigeration, heating and temperature control equipment, forming an independent temperature control closed loop.

[0011] On the other hand, the present invention also discloses an oil source system applied to the above-mentioned oil source device, comprising: The first power supply unit is used to generate and output hydraulic medium in a first working state; The second power supply unit is fluidly connected to the first power supply unit and is used to receive the first hydraulic medium and adjust its state to form a second hydraulic medium that meets the target test conditions. A medium delivery unit, connected to the second power supply unit, is used to deliver the second hydraulic medium to the hydraulic actuator under test and to receive the hydraulic medium returned by the hydraulic actuator. A parameter detection unit is installed on the medium conveying unit or the second power supply unit to collect the working parameters of the second hydraulic medium. The control unit is connected to the first power supply unit, the second power supply unit, and the parameter detection unit respectively. The control unit generates a control strategy based on the target test conditions and the feedback signal from the parameter detection unit to adjust the medium state of the second power supply unit and control the first power supply unit and the second power supply unit to work together to continuously output hydraulic medium that meets the target test conditions.

[0012] Preferably, the second power supply unit package includes: Includes a state transition component, which is used to change the pressure, flow rate, or temperature state of the hydraulic medium; The state transition component includes a booster cylinder, which has an input end and an output end, and realizes pressure amplification or flow regulation of the hydraulic medium through the piston area ratio.

[0013] Preferably, the second power supply unit further includes: Double-layer insulated oil tank and temperature control unit; The double-layer insulated oil tank is used to store hydraulic fluid and reduce heat exchange; The temperature control unit exchanges heat with the medium in the double-insulated oil tank through a heat exchanger to regulate the medium temperature; The input end of the booster cylinder is connected to the double-layer insulated oil tank, and the output end is connected to the medium conveying unit.

[0014] Preferably, the oil source is configured as a hydraulic medium with an output temperature range of -55℃ to 95℃ and a pressure range of 0 to 35MPa; The booster cylinder is equipped with a predetermined effective volume, and continuously outputs low-temperature hydraulic medium at a peak flow rate for no less than 20 seconds, and returns to the target state within a set time interval.

[0015] Preferably, the control unit employs a PID control algorithm or a feedforward control algorithm to dynamically adjust the flow output of the first power supply unit and the pressure ratio of the second power supply unit based on the pressure and temperature signals from the parameter detection unit, so as to eliminate pressure fluctuations and maintain uniform medium temperature.

[0016] Preferably, the medium delivery unit includes a high-pressure filter and a return oil filter to ensure that the cleanliness of the hydraulic medium delivered to the hydraulic actuator under test meets the SAE AS1241 standard.

[0017] Preferably, the first power supply unit includes a constant pressure variable pump and a drive motor, wherein the rated displacement of the constant pressure variable pump and the speed of the motor work together to ensure that the rated flow rate is not less than 100L / min.

[0018] Compared with the prior art, the oil source device and system of the present invention have the following advantages: Employing a base oil replenishment and servo booster architecture, the first power supply unit provides only low-pressure, high-flow base oil, while the booster cylinder in the second power supply unit acts as an energy conversion hub, converting low-pressure oil into high-pressure oil using a specific area ratio. This significantly reduces the overall system power and energy consumption while fully meeting the peak flow requirements during testing. Simultaneously, the control unit dynamically generates control strategies based on real-time feedback from multiple pressure, flow, and temperature sensors. For pressure control, a high-frequency closed loop formed by a servo valve and pressure sensor achieves precise adjustment. For temperature control, an independent heat exchange circuit combining a refrigeration and heating temperature control device with a double-layer insulated oil tank, along with temperature feedback, enables precise regulation of the medium temperature, effectively overcoming the impact of external interference and changes in the physical properties of the medium on the output.

[0019] Furthermore, this invention employs multi-level safety protection and anti-backflow design. In terms of pressure protection, the dual parallel design of the hydraulic pump's built-in relief valve and proportional relief valve enables continuous adjustment of overload pressure relief and the system's upper limit pressure. In terms of media flow control, a check valve is used to block the reverse flow of high-pressure oil and backflow on the low-pressure side to maintain stable boost pressure. Combined with a level relay to monitor the oil tank level in real time, it prevents the pump from sucking in air or overflowing, thereby ensuring the safe and stable operation of the system during long-term, high-load testing tasks.

[0020] Based on this, a manual / electromagnetic on / off switch and pressure-holding bypass were designed. The electromagnetic ball valve can be used to achieve automated switching of operating conditions and remote pressure relief and locking. The manual ball valve can also be used to short-circuit the pressure reducing valve or the isolation servo valve for easy maintenance. This meets the seamless switching requirements of complex testing processes and reduces the difficulty of equipment maintenance. Attached Figure Description

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the pipeline connection of the oil source device provided in an embodiment of the present invention; Figure 2 A schematic diagram of the pipeline connection of the high and low temperature oil source component of the oil source device provided in an embodiment of the present invention; Figure 3 This is a functional block diagram of an oil source system provided in an embodiment of the present invention.

[0022] In the diagram: 1. Pressure reducing valve; 2. First pressure sensor; 3. Flow sensor; 4. Servo valve; 5. Proportional relief valve; 6. First temperature sensor; 7. Second pressure sensor; 8. First manual ball valve; 9. Second manual ball valve; 10. Third pressure sensor; 11. Third manual ball valve; 12. Fourth manual ball valve; 13. First solenoid ball valve; 14. First check valve; 15. Booster cylinder; 16. Second check valve; 17. Relief valve; 18. Hydraulic pump; 19. Second solenoid ball valve; 20. Third solenoid ball valve; 21. Double-layer insulated oil tank; 22. Oil drain ball valve; 23. Refrigeration and heating temperature control equipment; 24. Liquid level relay; 25. Second temperature sensor; 26. Air filter; 31. Normal temperature oil tank; 32. Motor pump; 33. Accumulator. Detailed Implementation

[0023] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] See Figure 1 As shown, this embodiment proposes an oil source device, including: Ambient temperature oil source assembly, which includes an ambient temperature oil tank 31 and a motor pump 32, is used to provide ambient temperature hydraulic medium; High and low temperature oil source assembly, which includes a double-layer heat-insulated oil tank 21 and a hydraulic pump 18, is used to provide hydraulic medium for the test temperature range. The ambient temperature oil source component and the high and low temperature oil source component are connected through a solenoid ball valve and connected to the same external output interface through a switching valve group. The external output interface is used to connect the hydraulic actuator to be tested. The high and low temperature oil source assembly also includes a servo pressure regulating unit, which includes a booster cylinder 15. The low-pressure chamber of the booster cylinder 15 is connected to the hydraulic pump 18, and the high-pressure chamber is connected to the external output interface.

[0025] Specifically, the switching valve assembly refers to a combination of valves configured in the oil supply line. Through the cooperation of multiple control valves, it enables the directional connection or cutoff of the hydraulic pump 18 with the inlet and outlet oil circuits of different actuators, thereby switching the working state of the actuators. In this embodiment, the switching valve assembly is specifically used to control the hydraulic pump 18 to supply oil to the booster cylinder 15 or the main hydraulic cylinder. See Figure 1 As shown, in some embodiments of this application, the oil source device, the ambient temperature oil source component is configured with: The oil suction port of the motor pump 32 is connected to the ambient temperature oil tank 31; The oil outlet of the electric pump 32 is connected in series with a check valve, a filter, and a cooler. The oil outlet of the motor pump 32 is also connected in parallel with an overflow valve 17 and a proportional overflow valve 5. The oil drain ports of the overflow valve 17 and the proportional overflow valve 5 return to the ambient temperature oil tank 31. An accumulator 33 is connected in parallel to the downstream pipeline of the cooler, and a flow sensor 3 and a pressure sensor are connected in series. The output pipeline of the ambient temperature oil source component is connected in parallel with a solenoid ball valve group and a manual ball valve group.

[0026] Specifically, the valves of the ambient temperature oil source component are configured similarly to those of the high and low temperature oil source component. Those skilled in the art are familiar with their operating principles, and this embodiment will not elaborate further.

[0027] See Figure 2 As shown, in some embodiments of this application, the oil source device, the high and low temperature oil source assembly is configured with: The oil suction port of the hydraulic pump 18 is connected to the double-layer heat-insulated oil tank 21, and its oil outlet is connected in parallel with the built-in relief valve 17 and the proportional relief valve 5. The hydraulic pump 18 has two outlets: One path connects to the low-pressure chamber of the booster cylinder 15 via pressure reducing valve 1, and the other path connects to the oil inlet of the servo valve 4. The oil outlet of the servo valve 4 is connected to the high-pressure chamber of the booster cylinder 15 via a check valve; A pressure sensor is installed at the high-pressure output end of the booster cylinder 15, and a manual ball valve assembly is connected in parallel. The double-layer insulated oil tank 21 is equipped with an independent refrigeration, heating and temperature control device 23, forming an independent temperature control closed loop.

[0028] See Figure 1-3 As shown, this embodiment also discloses an oil source system, including: The first power supply unit is used to generate and output hydraulic medium in a first working state; The second power supply unit is fluidly connected to the first power supply unit and is used to receive the first hydraulic medium and adjust its state to form a second hydraulic medium that meets the target test conditions. The medium delivery unit is connected to the second power supply unit and is used to deliver the second hydraulic medium to the hydraulic actuator under test and to receive the hydraulic medium returned by the hydraulic actuator. The parameter detection unit is installed on the medium conveying unit or the second power supply unit to collect the working parameters of the second hydraulic medium. The control unit is connected to the first power supply unit, the second power supply unit, and the parameter detection unit respectively. Based on the target test conditions and the feedback signal from the parameter detection unit, the control unit generates a control strategy to adjust the medium state of the second power supply unit and control the first power supply unit and the second power supply unit to work together to continuously output hydraulic medium that meets the target test conditions.

[0029] Understandably, this embodiment employs a two-stage power supply architecture. The first power supply unit serves as the basic power source, providing hydraulic fluid in its normal state, while the second power supply unit acts as a condition adjustment hub, performing secondary processing on the fluid. A parameter detection unit captures the actual operating parameters of the second hydraulic fluid during its delivery process in real time and feeds the data back to the control unit. Based on this, the control unit dynamically generates a control strategy, performing high-frequency, precise fine-tuning of the fluid state in the second power supply unit. This closed-loop control mechanism effectively overcomes the influence of external environmental interference and changes in the fluid's own physical properties, ensuring that the continuously output hydraulic fluid strictly and stably conforms to the target test conditions. The control unit not only regulates the second power supply unit but also coordinates the first power supply unit, enabling them to form an organic collaborative working mode. This effectively avoids pressure fluctuations or fluid interruptions caused by mismatches between the supply and demand of the two stages, significantly improving the operational reliability of the entire oil source system during long-term, high-load testing tasks.

[0030] In some embodiments of this application, the second power supply unit includes: Includes a state transition component, which is used to change the pressure, flow rate, or temperature state of the hydraulic medium; The state transition component includes a booster cylinder 15, which has an input end and an output end, and realizes pressure amplification or flow regulation of the hydraulic medium through piston area ratio.

[0031] In some embodiments of this application, the second power supply unit further includes: Double-layer insulated oil tank 21 and temperature control unit; The double-walled insulated oil tank 21 is used to store hydraulic fluid and reduce heat exchange; The temperature control unit exchanges heat with the medium in the double-insulated oil tank 21 through a heat exchanger to regulate the medium temperature; The input end of the booster cylinder 15 is connected to the double-layer insulated oil tank 21, and the output end is connected to the medium conveying unit.

[0032] In some embodiments of this application, the system is configured to output a hydraulic medium with a temperature range of -55°C to 95°C and a pressure range of 0 to 35 MPa; The booster cylinder 15 is equipped with a predetermined effective volume, continuously outputting low-temperature hydraulic medium at peak flow for no less than 20 seconds, and returning to the target state within a set time interval.

[0033] In some embodiments of this application, the control unit employs a PID control algorithm or a feedforward control algorithm to dynamically adjust the flow output of the first power supply unit and the pressure ratio of the second power supply unit based on the pressure signal and temperature signal from the parameter detection unit, so as to eliminate pressure fluctuations and maintain uniform medium temperature.

[0034] In some embodiments of this application, the media delivery unit includes a high-pressure filter and a return oil filter to ensure that the cleanliness of the hydraulic medium delivered to the hydraulic actuator under test meets the SAE AS1241 standard.

[0035] In some embodiments of this application, the first power supply unit includes a constant pressure variable pump and a drive motor, wherein the rated displacement of the constant pressure variable pump and the speed of the motor work together to ensure that the rated flow rate is not less than 100 L / min.

[0036] Specifically, the high and low temperature oil source components are equipped with an oil tank supply temperature control zone, a base pump pressure replenishment unit, a servo pressure regulating unit, manual / electromagnetic on / off switch, and a one-way pressure holding bypass. The double-layer insulated oil tank 21 includes: A drain ball valve 22 is installed in parallel on the bottom side. It is normally closed, but can be opened to drain all the oil in the tank during maintenance. A level relay 24 is installed inside the double-layer insulated oil tank 21. It is immersed in the oil to monitor the oil level in real time, and the signal line is connected to an external monitoring and control system. An air filter 26 is installed at the vent on the top of the oil tank to filter air impurities entering the oil tank when the oil tank volume changes, preventing oil contamination. A refrigeration and heating temperature control device 23 is installed on the outside of the oil tank. The pipeline is connected to the heat exchange chamber of the oil tank, and the circulating heat exchange changes the temperature of the medium in the oil tank to achieve high and low temperature conditions. A second temperature sensor 25 is arranged on the inner wall of the oil tank / oil outlet pipeline to collect and upload the oil temperature signal of the oil body in real time. The hydraulic pump 18 pressure replenishment branch includes: The oil outlet pipe of the double-layer insulated oil tank 21 is connected to the oil inlet of the hydraulic pump 18. The hydraulic pump 18 continuously replenishes hydraulic oil to the low-pressure side of the booster cylinder 15, providing a basic oil flow. The hydraulic pump 18 integrates a built-in relief valve 17, which is connected in parallel to the pump outlet to limit the maximum pressure at the pump output end. In case of overload, the oil flows directly back to the oil tank. The main oil outlet of the hydraulic pump 18 branches into two parallel branches: First branch: Directly leads to the low-pressure oil inlet chamber of booster cylinder 15, serving as the basic oil replenishment channel for booster cylinder; The second branch is connected to the proportional relief valve 5, which is connected in parallel to the pump's main oil outlet pipeline. The electrical signal continuously adjusts the overall upper limit pressure of the system as a secondary safety pressure protection for the whole machine. The servo voltage regulation unit includes: The pump output oil first enters the pressure reducing valve 1. The reference oil pressure after manually rotating the valve is adjusted to complete the first-stage pressure stabilization pretreatment. The oil outlet pipe of pressure reducing valve 1 is connected in series with the first pressure sensor 2, which collects the reference oil pressure after pressure reducing valve 1 in real time and sends a feedback signal. Downstream of the pressure sensor, a flow sensor 3 is connected in series to monitor the real-time oil flow rate entering the servo branch and transmits the flow signal. The oil outlet of flow sensor 3 is connected to servo valve 4, which is the core of the closed-loop control system. Based on the pressure feedback signal, it adjusts the oil flow rate and direction entering and exiting the high-pressure chamber of booster cylinder 15. The pipe leading from servo valve 4 to the high-pressure chamber of booster cylinder 15... A second pressure sensor 7 is installed on the road to collect the real-time pressure on the high-pressure side of the booster cylinder, forming a closed-loop pressure control with the servo valve 4; the booster cylinder 15 is a high-low pressure composite cylinder, the low-pressure chamber receives oil replenishment from the hydraulic pump 18, and the high-pressure chamber is supplied with oil by the servo valve 4. The medium is boosted by the cylinder area ratio of 0.8:1, and high-pressure oil is output to the product under test; a third pressure sensor 10 is installed on the high-pressure output port pipeline of the booster cylinder 15 to monitor the final working pressure output to the workpiece and complete the pressure acquisition of the whole machine; the high and low pressure chambers of the booster cylinder and the oil drain port of the servo valve 4 are uniformly connected to the return oil pipeline, which is collected and returned to the double-layer heat-insulated oil tank 21; The media delivery unit includes manual / electromagnetic on / off switching and a one-way pressure-holding bypass, wherein: The main pipeline at the front end of the pressure reducing valve 1 is connected in parallel with the first manual ball valve 8, which can be manually short-circuited to achieve a straight-through oil circuit; the inlet and outlet sides of the servo valve 4 are connected in parallel with the second manual ball valve 9, which can be bypassed during maintenance to isolate the servo valve 4 for easy disassembly and maintenance; the high-pressure output workpiece pipeline of the booster cylinder 15 is connected in parallel with the third manual ball valve 11, which can be manually opened to release pressure after testing and release the high pressure at the workpiece end; the high and low pressure chambers of the booster cylinder are connected across the fourth manual ball valve 12, which can be opened to balance the oil pressure on both sides of the cylinder when the machine stops. Servo valve 4 controls the oil circuit with the first solenoid ball valve 13 in parallel. The oil circuit is switched remotely by the electrical control signal to realize automatic pressure relief / locking. Two second solenoid ball valves 19 and third solenoid ball valves 20 are arranged in the bypass of the high pressure output end of the booster cylinder to automatically control the high pressure oil circuit and realize automated working condition switching. The servo valve 4 is connected in series with the first check valve 14 in the pipeline to the high pressure chamber of the booster cylinder, which only allows oil to flow into the high pressure chamber of the booster cylinder in the forward direction, blocking the reverse flow of high pressure oil and maintaining the boost pressure; the hydraulic pump 18 replenishes oil to the low pressure chamber of the booster cylinder in series with the second check valve 16 to prevent the oil on the low pressure side of the booster cylinder from flowing back into the hydraulic pump 18 and to stabilize the oil replenishment circuit. The second temperature sensor 25 on the side of the double-layer heat-insulated oil tank 21 monitors the base temperature of the medium in the oil tank; the first temperature sensor 6 is arranged on the servo booster main oil circuit to monitor the real-time temperature of the working oil entering the booster cylinder, and cooperates with the cooling and heating temperature control equipment 23 for closed-loop temperature control.

[0037] Understandably, pressure reducing valve 1, as a manual control valve, is mainly used to regulate and control the downstream pressure. The pressure sensor and temperature sensor in the system are responsible for measuring the pressure and temperature of the hydraulic medium, respectively, and transmitting these key signals to the measurement and control system for real-time status feedback. Flow sensor 3 is used to measure the flow rate of the medium in the pipeline, also transmitting the signal to the measurement and control system. Servo valve 4 forms a closed-loop control with the corresponding pressure sensor, thereby achieving precise servo control of the inlet pressure of booster cylinder 15. Proportional relief valve 5 limits the maximum pressure of the system through proportional control to ensure safe system operation. In terms of oil circuit control, manual ball valves are used to manually control the opening and closing of the oil circuit passage, while electromagnetic ball valves are used to achieve remote control of the oil circuit's on / off state. The function of the check valve is to restrict the medium in the pipeline to flow in only one direction, ensuring a fixed flow direction. Booster cylinder 15, in conjunction with the oil source, pressurizes the working medium of the product. The relief valve 17, integrated directly within the hydraulic pump 18, limits the system's maximum pressure. The hydraulic pump 18 replenishes the output of the booster cylinder with hydraulic fluid. For auxiliary systems and temperature control, the double-walled insulated oil tank 21, serving as a storage container for the hydraulic fluid, not only supports some hydraulic components but also effectively reduces temperature loss of the medium within the tank. The cooling / heating temperature control device 23 cools or heats the hydraulic medium in the tank to maintain a suitable operating temperature. The level relay 24 measures the position of the hydraulic medium in the tank and transmits the signal to the control system, enabling remote monitoring of the medium's position. Furthermore, an air filter 26 is installed in the system specifically to filter contaminants from the air entering the system, ensuring the cleanliness of the hydraulic fluid.

[0038] It is understood that this embodiment discloses the overall design of the main oil supply line, the oil replenishment branch line, the pressure protection parallel branch line, the monitoring point series connection, the switching bypass parallel connection, and the temperature control circulation branch line. The oil temperature is independently controlled by the independent closed loop of the cooling and heating temperature control device 23 and the double-layer heat-insulated oil tank 21 heat exchange pipeline, without interfering with the main pressure oil circuit.

[0039] Compared with the prior art, the beneficial effects of this embodiment are as follows: The system innovatively employs a two-stage power supply architecture consisting of basic oil replenishment and servo boosting. The hydraulic pump 18 is only responsible for providing low-pressure, high-flow basic oil, while the booster cylinder 15 acts as an energy conversion hub, transforming the low-pressure oil into high-pressure oil. This significantly reduces the overall installed power of the system while meeting the peak flow requirements during testing.

[0040] The control unit dynamically generates a control strategy based on real-time feedback from multiple pressure, flow, and temperature sensors in the parameter detection unit; it forms a high-frequency closed loop with the servo valve 4 and the second pressure sensor 7 to achieve precise servo adjustment of the inlet pressure of the booster cylinder; and it achieves precise control of the medium temperature through the independent heat exchange circuit of the cooling and heating temperature control device 23 and the double-layer insulated oil tank 21, combined with temperature sensor feedback, to ensure that the output second hydraulic medium strictly conforms to the target test conditions.

[0041] In terms of pressure protection, a dual design of built-in relief valve 17 and proportional relief valve 5 is adopted to realize overload pressure relief and continuous adjustment of the upper limit pressure of the system. In terms of media flow direction, a check valve is used to block the backflow of high pressure oil and the backflow of low pressure side, so as to maintain the stability of boost pressure. At the same time, the liquid level relay 24 monitors the liquid level in the oil tank in real time to prevent pump cavitation or overflow, which greatly improves the reliability of the system in long-term, high-load test tasks.

[0042] The design incorporates numerous manual / electromagnetic on / off and pressure-holding bypass options, providing the hydraulic circuit with exceptional flexibility. For example, an electromagnetic ball valve enables automated switching of operating conditions and remote pressure relief / locking, while a manual ball valve can be used to short-circuit pressure reducing valve 1 or isolation servo valve 4 for easy maintenance. This modular and bypass-oriented design not only allows for seamless switching of complex testing procedures but also significantly reduces the difficulty of equipment maintenance.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An oil source device, characterized in that, include: A room-temperature oil source assembly, comprising a room-temperature oil tank and a motor pump, is used to provide room-temperature hydraulic medium; A high and low temperature oil source assembly, comprising a double-layer insulated oil tank and a hydraulic pump, for providing hydraulic medium for the test temperature range; The ambient temperature oil source component and the high and low temperature oil source component are connected by a solenoid ball valve and connected to the same external output interface through a switching valve group. The external output interface is used to connect the hydraulic actuator to be tested. The high and low temperature oil source assembly also includes a servo pressure regulating unit, which includes a booster cylinder. The low-pressure chamber of the booster cylinder is connected to a hydraulic pump, and the high-pressure chamber is connected to an external output interface.

2. The oil source device according to claim 1, characterized in that, The high and low temperature oil source component is equipped with: The hydraulic pump's suction port is connected to a double-layer insulated oil tank, and its outlet is connected in parallel with a built-in relief valve and a proportional relief valve. The hydraulic pump has two outlets: One path connects to the low-pressure chamber of the booster cylinder via a pressure reducing valve, and the other path connects to the oil inlet of the servo valve. The oil outlet of the servo valve is connected to the high-pressure chamber of the booster cylinder via a check valve. The high-pressure output end of the booster cylinder is equipped with a pressure sensor and connected in parallel with a manual ball valve assembly; The double-layer insulated oil tank is equipped with independent refrigeration, heating and temperature control equipment.

3. An oil source system for use in the oil source device as described in any one of claims 1-2, characterized in that, include: The first power supply unit is used to generate and output hydraulic medium in a first working state; The second power supply unit is fluidly connected to the first power supply unit and is used to receive the first hydraulic medium and adjust its state to form a second hydraulic medium that meets the target test conditions. A medium delivery unit, connected to the second power supply unit, is used to deliver the second hydraulic medium to the hydraulic actuator under test and to receive the hydraulic medium returned by the hydraulic actuator. A parameter detection unit is installed on the medium conveying unit or the second power supply unit to collect the working parameters of the second hydraulic medium. The control unit is connected to the first power supply unit, the second power supply unit, and the parameter detection unit via signals, respectively.

4. The oil source system according to claim 3, characterized in that, The second power supply unit includes: a state transition component, which is used to change the pressure, flow rate or temperature state of the hydraulic medium; The state transition component includes a booster cylinder, which has an input end and an output end, and realizes pressure amplification or flow regulation of the hydraulic medium through the piston area ratio.

5. The oil source system according to claim 4, characterized in that, The second power supply unit further includes: Double-layer insulated oil tank and temperature control unit; The double-layer insulated oil tank is used to store hydraulic fluid and reduce heat exchange; The temperature control unit exchanges heat with the medium in the double-insulated oil tank through a heat exchanger to regulate the medium temperature; The input end of the booster cylinder is connected to the double-layer insulated oil tank, and the output end is connected to the medium conveying unit.

6. The oil source system according to claim 5, characterized in that, The oil source system is configured to output hydraulic medium with a temperature range of -55℃ to 95℃ and a pressure range of 0 to 35MPa. The booster cylinder is equipped with a predetermined effective volume, and continuously outputs low-temperature hydraulic medium at a peak flow rate for no less than 20 seconds, and returns to the target state within a set time interval.

7. The oil source system according to claim 6, characterized in that, The control unit employs a PID control algorithm or a feedforward control algorithm to adjust the flow output of the first power supply unit and the pressure ratio of the second power supply unit based on the pressure and temperature signals from the parameter detection unit.

8. The oil source system according to claim 7, characterized in that, The medium delivery unit includes a high-pressure filter and a return oil filter to ensure the cleanliness of the hydraulic medium delivered to the hydraulic actuator under test.

9. The oil source system according to claim 8, characterized in that, The first power supply unit includes a constant pressure variable pump and a drive motor. The rated displacement of the constant pressure variable pump and the speed of the motor are coordinated, and the rated flow rate is not less than 100L / min.

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