Lubricating oil flow test equipment for gas turbine

Abstract

The utility model discloses a gas turbine lubricating oil flow test device in the technical field of test device design, which comprises an oil supply system main path, the oil supply system main path comprises a heating oil tank, and an oil suction filter, a ball valve, a screw pump set, a pipeline filter, a surge flask, a large flowmeter, an electric ball valve and a quick-change connector which are sequentially connected in series through a pipeline, the quick-change connector is connected with an inlet of a tested piece through an adapter pipe, an outlet of the tested piece is connected with the heating oil tank, the adapter pipe between the quick-change connector and the tested piece is connected with a pressure transmitter, the two ends of the electric ball valve are connected with small flow meters in parallel, and the heating oil tank is connected between the screw pump set and the pipeline filter through a pressure relief bypass. And a heating oil tank is connected between the pipeline filter and the surge flask through a pressure regulating bypass. According to the scheme, variable-frequency pressure regulation and automatic matching of flow and instrument measuring range are adopted, and wide-measuring-range closed-loop pressure regulation and accurate flow measurement are achieved.

Description

Technical Field

[0001] This utility model relates to a gas turbine lubricating oil flow test device, belonging to the field of test equipment design technology. Background Technology

[0002] To ensure that the lubrication and heat dissipation requirements of the gas turbine are met during operation, the flow capacity of its lubricating oil system and various lubrication components must be checked when the whole machine is assembled. Flow tests are usually used to verify the flow distribution and supply of lubricating oil under specific operating conditions.

[0003] Due to the significant differences in flow rates among various components, the existing lubricating oil flow test equipment cannot cover all operating conditions with the flow range of the regulating valve and the measurement range of the flow meter. Multiple equipment needs to be replaced or multiple oil circuits need to be manually switched to complete all tests. Manual pressure adjustment is inconvenient, resulting in low production efficiency and high energy consumption. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a gas turbine lubricating oil flow test device. Through the innovative application of frequency conversion control technology and flow segment measurement technology, the flow range of a single test device has been significantly improved. It has the advantages of high automation, convenient operation, high efficiency and energy saving, while having low manufacturing and maintenance costs.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] In a first aspect, this utility model provides a gas turbine lubricating oil flow test device, including a main oil supply system. The main oil supply system includes a heated oil tank and, in series via pipelines, an oil suction filter, a ball valve, a screw pump set, a pipeline filter, a buffer bottle, a high-flow meter, an electric ball valve, and a quick-connect coupling. The quick-connect coupling is connected to the inlet of the test piece via a transfer pipe, and the outlet of the test piece is connected to the heated oil tank. A pressure transmitter is connected to the transfer pipe between the quick-connect coupling and the test piece. Small flow meters are connected in parallel at both ends of the electric ball valve. The screw pump set and the pipeline filter are connected to the heated oil tank via a pressure relief bypass. The pipeline filter and the buffer bottle are connected to the heated oil tank via a pressure regulating bypass. The screw pump set, the high-flow meter, the small flow meter, the electric ball valve, and the pressure transmitter are electrically connected to an electrical control system.

[0007] Furthermore, the pressure relief bypass includes a safety valve, one end of which is connected to the pipeline between the screw pump unit and the pipeline filter via a return oil pipeline, and the other end of which is connected to the heating oil tank via a return oil pipeline.

[0008] Furthermore, the pressure regulating bypass includes a pressure regulating valve, one end of which is connected to the pipeline between the pipeline filter and the buffer bottle via a return oil pipeline, and the other end of which is connected to the heating oil tank via a return oil pipeline.

[0009] Furthermore, the electrical control system includes a PLC connected to an LCD touchscreen, and the PLC is electrically connected to the screw pump unit via a frequency converter. The large flow meter, small flow meter, electric ball valve, and pressure transmitter are electrically connected to the PLC.

[0010] Furthermore, the flow rate of the large flow meter is 1000L / h to 12000L / h, and the flow rate of the small flow meter is 50L / h to 1200L / h.

[0011] Furthermore, a pressure gauge is connected to the pipeline between the screw pump assembly and the pipeline filter.

[0012] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0013] I. Full-Range Adaptive Flow Measurement Mechanism: Based on a dual-flowmeter collaborative architecture (large flowmeter / small flowmeter) and PLC threshold logic control, an intelligent flow range identification system is constructed. When the flow rate exceeds the preset threshold, the PLC automatically switches the main measurement channel via an electric ball valve. Combined with the pulsation suppression function of the buffer bottle, seamless measurement across the 50L / h to 6000L / h range is achieved. This system overcomes the limitation of traditional equipment requiring manual range switching, ensuring measurement accuracy across the entire range through automatic instrument range matching technology.

[0014] II. Dynamic Pressure Precision Control System: A pressure self-regulating network is formed through the variable frequency drive of the screw pump unit and the closed-loop feedback of the pressure transmitter. The PLC performs PID calculations based on the real-time collected pressure values ​​and dynamically adjusts the speed of the variable frequency motor to achieve a control accuracy of ≤±1.5% for pressure fluctuations within the range of 0.2-0.5MPa. The pressure regulating bypass (pressure regulating valve) and the main line form a composite pressure regulating topology, supporting the system to respond quickly to sudden changes in flow and avoiding pressure overshoot caused by traditional single pressure regulating methods.

[0015] III. Integrated Design of Safety Redundancy and Energy Efficiency Optimization: The pressure relief bypass (safety valve) and the main pump set form a dual mechanical-electrical protection system, prioritizing the activation of the mechanical pressure relief mechanism when the system pressure exceeds the threshold. The variable frequency drive system automatically matches the optimal speed condition by calculating the pump set efficiency curve and pipeline impedance characteristics in real time, effectively saving energy compared to traditional fixed-speed pump sets, while also reducing equipment operating noise;

[0016] IV. Intelligent Human-Machine Interaction Platform: Based on the data interaction architecture of LCD touch screen and PLC, an integrated interface for parameter setting, process monitoring, and data recording has been developed. The system has built-in templates for typical test conditions, supports automatic generation of flow-pressure curves and self-diagnosis of abnormal conditions, significantly improving equipment operating efficiency and maintainability. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 A system schematic diagram of a gas turbine lubricating oil flow test device provided for an embodiment of this utility model.

[0019] In the diagram: 1. Heated oil tank; 2. Suction filter; 3. Ball valve; 4. Screw pump unit; 5. Pipeline filter; 6. Safety valve; 7. Pressure regulating valve; 8. Buffer bottle; 9. Large flow meter; 10. Small flow meter; 11. Electric ball valve; 12. Quick-connect coupling; 13. Pressure transmitter; 14. Pressure gauge. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0021] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this invention.

[0022] Example:

[0023] This solution provides a wide-range gas turbine lubricating oil flow test device. Within a pressure range of 0.2–0.5 MPa and a flow rate range of 50 L / h–6000 L / h, it employs frequency conversion pressure regulation and automatic flow rate matching with instrument range technology to achieve wide-range closed-loop pressure regulation and accurate flow measurement. This solves the problems of limited range coverage and inconvenient manual pressure adjustment and range switching operations found in traditional test equipment. The specific technical solution is as follows:

[0024] The lubricating oil flow test equipment includes a main oil supply system, a pressure regulating bypass, a pressure relief bypass, and an electrical control system. The main oil supply system consists of a heated oil tank 1, a suction filter 2, a screw pump unit 4, a pipeline filter 5, a buffer bottle 8, a large flow meter 9, a small flow meter 10, an electric ball valve 11, a pressure transmitter 13, and a pressure gauge 14. The pressure regulating bypass, located after the pipeline filter 5 on the main line, consists of a pressure regulating valve 7 and a return oil line, used for manual flow diversion and pressure regulation. The pressure relief bypass, a branch after the main pump, consists of a safety valve 6 and a return oil line, used to limit the system's maximum operating pressure. The electrical control system consists of a PLC, a frequency converter, and an LCD touchscreen.

[0025] The lubricating oil flow test equipment is controlled by PLC and host computer program. In operation, the lubricating oil in the heated oil tank 1 is sucked in and pressurized by the oil supply pump group through the oil suction filter 2, and enters the test specimen inlet through the pipeline filter 5, buffer bottle 8, large flow meter 9, small flow meter 10 and electric ball valve 11. When the oil supply flow is less than the set threshold, it enters the test specimen inlet through the large flow meter 9 and small flow meter 10. The threshold judgment is based on the data collected by the PLC from the small flow meter 10.

[0026] 1) Implementation method and steps of variable frequency pressure closed-loop regulation:

[0027] The screw pump unit 4 is driven by a variable frequency motor. The motor speed is adjusted by the frequency converter to achieve precise control of the flow rate and pressure delivered by the screw pump. The PLC, frequency converter, pressure transmitter 13, and screw pump unit 4 form a closed-loop pressure control system. The PLC is the controller, responsible for PID calculation and processing of input and output signals. The actuators are the frequency converter and the screw pump unit, which precisely control the motor speed based on the output signal of the PLC. The pressure transmitter 13 is a feedback element that feeds back the real-time pressure signal to the signal input terminal of the PLC so that the PLC can make precise adjustments.

[0028] During the test, according to Figure 1 The test specimen is connected as shown. The target pressure is set on the LCD touch screen, and the screw pump is started. At this time, the real-time oil supply pressure collected by the PLC deviates significantly from the set pressure. The PLC controller will calculate the corresponding control signal and adjust the motor speed through the frequency converter to make the pressure value quickly approach the target value. Then, the control signal is corrected in real time according to the real-time deviation value to eliminate the deviation and make it reach a stable state.

[0029] 2) Steps for automatically matching flow rate with instrument range:

[0030] Two flow meters, one large and one small, are used to measure flow in segments. A small flow meter 10 and an electric ball valve 11 are connected in parallel downstream of the large flow meter 9. The flow range of the large flow meter 9 is 1000 L / h to 12000 L / h, and the flow range of the small flow meter 10 is 50 L / h to 1200 L / h. The two flow meters are compatible within the flow range of 1000 L / h to 12000 L / h. The PLC collects the signals from the two flow meters in real time and switches the electric ball valve 11 based on the data from the large flow meter 9, with a switching threshold set at 1000 L / h. When the lubricating oil flow is ≤1000 L / h, the PLC automatically controls the electric ball valve 11 to be in the closed state. At this time, the two flow meters are in series, and the PLC program displays the data of the small flow meter 10 on the LCD touch screen interface. When the lubricating oil flow is >1000 L / h, the PLC automatically controls the electric ball valve 11 to be in the open state, and the data of the large flow meter 9 is displayed on the LCD touch screen interface. This enables seamless integration of segmented flow measurement, meeting the flow measurement accuracy requirements within the working range of 50L / h to 12000L / h.

[0031] This solution utilizes core technologies such as main-bypass topology optimization, electromechanical-hydraulic collaborative control algorithms, and adaptive switching of the measurement system to construct a gas turbine lubricating oil flow detection platform with wide range coverage, high precision maintenance, and strong anti-interference characteristics, providing a new generation of intelligent solutions for aerospace power system testing.

[0032] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model 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 this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A gas turbine lubricating oil flow test device, characterized in that, The system includes a main oil supply system, which comprises a heated oil tank (1) and, in series via pipelines, an oil suction filter (2), a ball valve (3), a screw pump assembly (4), a pipeline filter (5), a buffer bottle (8), a high-flow meter (9), an electric ball valve (11), and a quick-connect coupling (12). The quick-connect coupling (12) is connected to the inlet of the test specimen via a transfer pipe, and the outlet of the test specimen is connected to the heated oil tank (1). The transfer pipe between the quick-connect coupling (12) and the test specimen is connected to... The pressure transmitter (13) has a small flow meter (10) connected in parallel at both ends of the electric ball valve (11). The screw pump group (4) and the pipeline filter (5) are connected to the heating oil tank (1) through a pressure relief bypass. The pipeline filter (5) and the buffer bottle (8) are connected to the heating oil tank (1) through a pressure regulating bypass. The screw pump group (4), the large flow meter (9), the small flow meter (10), the electric ball valve (11) and the pressure transmitter (13) are electrically connected to an electrical control system.

2. The gas turbine lubricating oil flow test equipment according to claim 1, characterized in that, The pressure relief bypass includes a safety valve (6), one end of which is connected to the pipeline between the screw pump group (4) and the pipeline filter (5) through the return oil pipeline, and the other end is connected to the heating oil tank (1) through the return oil pipeline.

3. The gas turbine lubricating oil flow test equipment according to claim 1, characterized in that, The pressure regulating bypass includes a pressure regulating valve (7), one end of which is connected to the pipeline between the pipeline filter (5) and the buffer bottle (8) through the return oil pipeline, and the other end is connected to the heating oil tank (1) through the return oil pipeline.

4. The gas turbine lubricating oil flow test equipment according to claim 1, characterized in that, The electrical control system includes a PLC connected to an LCD touch screen. The PLC is electrically connected to the screw pump group (4) via a frequency converter. The large flow meter (9), small flow meter (10), electric ball valve (11), and pressure transmitter (13) are electrically connected to the PLC.

5. The gas turbine lubricating oil flow test equipment according to claim 1, characterized in that, The range of the large flow meter (9) is 1000L / h to 12000L / h, and the range of the small flow meter (10) is 50L / h to 1200L / h.

6. The gas turbine lubricating oil flow test equipment according to claim 1, characterized in that, A pressure gauge (14) is connected to the pipeline between the screw pump assembly (4) and the pipeline filter (5).

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