Hydraulic power extracting and adjusting device

Abstract

The invention belongs to the technical field of aero-engines, and particularly relates to a hydraulic power extraction adjusting device which comprises an oil tank and a low-pressure oil supply unit, the low-pressure oil supply unit is connected with a power extraction accessory, and hydraulic oil in the oil tank is provided for the power extraction accessory; the power extraction accessory is connected with the aero-engine and used for extracting the mechanical power of the aero-engine; the upstream is connected with the low-pressure oil supply unit and the downstream is connected with the electric control valve unit; the electric control valve unit is used for receiving the control signal and adjusting the opening degree of the hydraulic pipeline; the pressure compensation device is connected to the downstream of the electric control valve unit and used for keeping the pressure difference of hydraulic oil in front of and behind the electric control valve unit within a certain range; the flow metering unit is arranged at the downstream of the pressure compensation device and used for detecting the hydraulic flow in real time; the downstream is connected with the oil tank; and the upper computer control system is in communication connection with the electric control valve unit and the flow metering unit.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to a hydraulic power extraction and adjustment device. Background Technology

[0002] Aircraft utilize hydraulic systems to control flight control surfaces (ailerons, elevators, rudder), landing gear retraction and extension, thrust reverser operation, and braking systems, collectively known as actuators. The aircraft's hydraulic system uses hydraulic pumps to convert the mechanical power output from the aircraft engine into hydraulic power, which is then supplied to the various actuators. This process is called hydraulic power extraction.

[0003] To assess the impact of hydraulic power extraction on the steady-state and transient operation of aero-engines under various operating conditions, hydraulic power extraction tests are required during ground testing of the entire aero-engine. To simulate hydraulic power extraction under different aircraft operating conditions, the hydraulic power extraction tester must have power adjustment capabilities. Since aircraft hydraulic systems typically use constant-pressure variable displacement piston pumps, the power adjustment of the hydraulic power extraction tester essentially involves regulating the flow rate of the hydraulic system.

[0004] Conventional power extraction and regulation devices use multiple fixed throttling nozzles connected in parallel, with high-pressure solenoid valves acting as switches on each branch to connect each branch as needed, thereby regulating the system flow.

[0005] This patent invention provides a hydraulic power extraction and adjustment device that enables continuous and high-precision adjustment of the extracted power during test runs, unaffected by fluctuations in the hydraulic pump outlet pressure. Summary of the Invention

[0006] To address the aforementioned problems, this application provides a hydraulic power extraction and adjustment device, comprising:

[0007] The oil tank is connected to the low-pressure oil supply unit, which in turn is connected to the power extraction accessory, supplying the hydraulic oil from the oil tank to the power extraction accessory.

[0008] The power extraction accessory connects to the aircraft engine and is used to extract the mechanical power of the aircraft engine; it connects upstream to the low-pressure fuel supply unit and downstream to the electronically controlled valve unit.

[0009] The electronically controlled valve unit is used to receive control signals and adjust the opening of the hydraulic lines;

[0010] A pressure compensation device is connected downstream of the electrically controlled valve unit to maintain the hydraulic oil pressure difference before and after the electrically controlled valve unit within a certain range.

[0011] A flow metering unit is located downstream of the pressure compensation device and is used to detect hydraulic flow in real time; its downstream end is connected to the oil tank.

[0012] The host computer control system is communicatively connected to the electrically controlled valve unit and the flow metering unit.

[0013] Preferably, the host computer control system is configured to dynamically adjust the opening degree of the electronically controlled valve unit based on the difference between the target flow rate and the actual flow rate fed back by the flow metering unit, thereby achieving continuous and precise control of the hydraulic power.

[0014] Preferably, the pressure compensation device is a differential pressure compensator, which can automatically maintain a constant pressure difference between the inlet and outlet of the electrically controlled valve unit.

[0015] Preferably, the electrically controlled valve unit is a proportional valve or a servo valve, and its opening degree is linearly related to the input control signal.

[0016] Preferably, the flow metering unit uses a turbine flow meter or a Coriolis mass flow meter with a measurement accuracy of ±0.5%.

[0017] Preferably, it also includes a temperature sensor for detecting the hydraulic oil temperature, and the host computer control system performs temperature compensation on the flow measurement results based on the temperature value.

[0018] Preferably, a low-pressure filtration unit is installed upstream of the power extraction accessory, and a high-pressure filtration unit is installed downstream.

[0019] A hydraulic power extraction and adjustment method for the aforementioned hydraulic power extraction and adjustment device includes the following steps: adjusting the flow rate of the hydraulic pipeline through an electronically controlled valve unit; stabilizing the valve working pressure difference using a pressure compensation device; collecting the actual flow rate value in real time through a flow metering unit; and comparing the actual flow rate with the target flow rate using a host computer control system, and dynamically correcting the valve opening using a closed-loop control algorithm.

[0020] The advantage of this application is that it achieves high-precision flow control by ensuring the pressure difference across the proportional valve. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a hydraulic power extraction and adjustment device. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some embodiments of this application, not all embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings. The technical solution of this invention is: a back pressure valve is installed after the proportional valve of the hydraulic loading system, linked to the pressure before the proportional valve, maintaining a constant pressure difference before and after the proportional valve. Simultaneously, the opening degree of the proportional valve is correlated with the real-time data fed back by the flow metering unit, ensuring that the flow metering data matches the expected data. The system principle block diagram is as follows: Figure 1 As shown. Includes:

[0023] The oil tank is connected to the low-pressure oil supply unit, which in turn is connected to the power extraction accessory, supplying the hydraulic oil from the oil tank to the power extraction accessory.

[0024] The power extraction accessory connects to the aircraft engine and is used to extract the mechanical power of the aircraft engine; it connects upstream to the low-pressure fuel supply unit and downstream to the electronically controlled valve unit.

[0025] The electronically controlled valve unit is used to receive control signals and adjust the opening of the hydraulic lines;

[0026] A pressure compensation device is connected downstream of the electrically controlled valve unit to maintain the hydraulic oil pressure difference before and after the electrically controlled valve unit within a certain range.

[0027] A flow metering unit is located downstream of the pressure compensation device and is used to detect hydraulic flow in real time; its downstream end is connected to the oil tank.

[0028] The host computer control system is communicatively connected to the electrically controlled valve unit and the flow metering unit.

[0029] Preferably, the host computer control system is configured to dynamically adjust the opening degree of the electronically controlled valve unit based on the difference between the target flow rate and the actual flow rate fed back by the flow metering unit, thereby achieving continuous and precise control of the hydraulic power.

[0030] For example, the electronically controlled valve unit receives a 4-20mA control signal from the host computer control system and adjusts the hydraulic pipeline flow by changing the valve core opening. The pressure compensation device uses the differential pressure feedback principle; when the hydraulic pump outlet pressure fluctuates, it automatically adjusts the throttling area through an internal spring-slide valve mechanism to maintain a constant valve operating differential pressure. The flow metering unit detects the actual flow value in real time and feeds it back to the host computer, forming a closed-loop control.

[0031] The principle is as follows: the flow rate formula of the flow regulating valve It can be seen that the flow rate through the valve is related to the valve flow coefficient ( ), density of the working medium flowing through the valve ( ), valve flow area (A) and pressure difference across the valve ( The working medium density is affected by temperature. In this invention, the working medium enters... When the proportional valve is used, because a back pressure valve is used to maintain a small pressure difference across the proportional valve, the temperature rise of the oil after flowing through the proportional valve is minimal, and the effect of temperature on the density of the working medium can be ignored. Valve flow coefficient ( This is an inherent characteristic of the valve. Therefore, when the pressure difference across the valve remains constant, the flow rate through the valve is only related to the valve opening, which is controlled solely by commands from the host computer, ensuring the stability of flow control.

[0032] The back pressure valve is a constant differential pressure reducing valve used to ensure a constant pressure difference across the proportional valve.

[0033] In practical applications, system disturbances are unavoidable. In such cases, the system's host computer reads the real-time measured data from the flow metering unit and fine-tunes the proportional valve opening to ensure accurate flow. Furthermore, this control method can also achieve flow-time curves of arbitrary waveforms (square wave, sine wave, triangle wave, etc.).

[0034] Preferably, the pressure compensation device is a differential pressure compensator, which can automatically maintain a constant pressure difference between the inlet and outlet of the electrically controlled valve unit.

[0035] Preferably, the electrically controlled valve unit is a proportional valve or a servo valve, and its opening degree is linearly related to the input control signal.

[0036] Preferably, the flow metering unit uses a turbine flow meter or a Coriolis mass flow meter with a measurement accuracy of ±0.5%.

[0037] Preferably, it also includes a temperature sensor for detecting the hydraulic oil temperature, and the host computer control system performs temperature compensation on the flow measurement results based on the temperature value.

[0038] Preferably, a low-pressure filtration unit is installed upstream of the power extraction accessory, and a high-pressure filtration unit is installed downstream.

[0039] A hydraulic power extraction and adjustment method for the aforementioned hydraulic power extraction and adjustment device includes the following steps: adjusting the flow rate of the hydraulic pipeline through an electronically controlled valve unit; stabilizing the valve working pressure difference using a pressure compensation device; collecting the actual flow rate value in real time through a flow metering unit; and comparing the actual flow rate with the target flow rate using a host computer control system, and dynamically correcting the valve opening using a closed-loop control algorithm.

[0040] Compared with existing hydraulic loading flow regulating devices, the specific gain effects of the present invention are as follows:

[0041] (1) A single set of equipment was developed to meet the hydraulic loading test requirements of various types of aero engines;

[0042] (2) By controlling the pressure difference across the proportional valve, the influence of working medium density change on flow control is eliminated, and the proportional valve opening-flow sensitivity is improved (i.e., the proportional valve flow stiffness is reduced), thereby improving flow control accuracy and resolution.

[0043] The data from the flow metering unit is fed back to the host computer, which then issues proportional valve opening commands to achieve high-precision flow control and various non-flow waveforms (sine wave, square wave, triangle wave, etc.).

[0044] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A hydraulic power extraction and adjustment device, characterized in that, include: The oil tank is connected to the low-pressure oil supply unit, which in turn is connected to the power extraction accessory, supplying the hydraulic oil from the oil tank to the power extraction accessory. The power extraction accessory connects to the aircraft engine and is used to extract the mechanical power of the aircraft engine; it connects upstream to the low-pressure fuel supply unit and downstream to the electronically controlled valve unit. The electronically controlled valve unit is used to receive control signals and adjust the opening of the hydraulic lines; A pressure compensation device is connected downstream of the electrically controlled valve unit to maintain the hydraulic oil pressure difference before and after the electrically controlled valve unit within a certain range. A flow metering unit is located downstream of the pressure compensation device and is used to detect hydraulic flow in real time; its downstream end is connected to the oil tank. The host computer control system is communicatively connected to the electrically controlled valve unit and the flow metering unit.

2. The hydraulic power extraction and adjustment device as described in claim 1, characterized in that, The host computer control system is configured to dynamically adjust the opening degree of the electric control valve unit based on the difference between the target flow value and the actual flow value fed back by the flow metering unit, thereby achieving continuous and precise control of hydraulic power.

3. The hydraulic power extraction and adjustment device as described in claim 1, characterized in that, The pressure compensation device is a differential pressure compensator, which can automatically maintain a constant pressure difference between the inlet and outlet of the electrically controlled valve unit.

4. The hydraulic power extraction and adjustment device as described in claim 1, characterized in that, The electrically controlled valve unit is a proportional valve or a servo valve, and its opening degree is linearly related to the input control signal.

5. The hydraulic power extraction and adjustment device as described in claim 1, characterized in that, The flow metering unit uses a turbine flow meter or a Coriolis mass flow meter with a measurement accuracy of ±0.5%.

6. The hydraulic power extraction and adjustment device as described in claim 1, characterized in that, It also includes a temperature sensor for detecting the temperature of the hydraulic oil, and the host computer control system performs temperature compensation on the flow measurement results based on the temperature value.

7. The hydraulic power extraction and adjustment device as described in claim 1, characterized in that, A low-pressure filtration unit is installed upstream of the power extraction accessory, and a high-pressure filtration unit is installed downstream.

8. A method for hydraulic power extraction and adjustment of a hydraulic power extraction and adjustment device as described in any one of claims 1-7, characterized in that, Includes the following steps: The flow rate of the hydraulic pipeline is adjusted by an electronically controlled valve unit; The pressure compensation device is used to stabilize the valve's operating pressure differential; the actual flow rate value is collected in real time through the flow metering unit. The host computer control system compares the actual flow rate with the target flow rate and uses a closed-loop control algorithm to dynamically correct the valve opening.

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