Monitoring device and method for hydraulic oil system of gas turbine

Abstract

The invention discloses a monitoring device and method for a hydraulic oil system of a gas turbine, and particularly relates to the field of hydraulic oil of the gas turbine, the monitoring device for the hydraulic oil system of the gas turbine comprises a redundant electromagnetic valve group mounted on an oil tank, an oil supply mechanism is mounted on the oil tank, and an oil return pipeline is mounted on the oil supply mechanism; the redundant electromagnetic valve set is communicated with the oil return pipeline and comprises a first electromagnetic valve, a second electromagnetic valve, a first redundant electromagnetic valve and a second redundant electromagnetic valve, and the first electromagnetic valve, the second electromagnetic valve, the first redundant electromagnetic valve and the second redundant electromagnetic valve are connected in series. A first monitoring point and a second monitoring point are arranged on a series circuit of the first redundant electromagnetic valve and the second redundant electromagnetic valve. According to the invention, risks such as unit load shedding or tripping caused by failure or performance degradation of a single electromagnetic valve coil or failure of normal switching of a gas turbine hydraulic oil system or reduction of hydraulic oil pressure in operation are effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic oil for gas turbines, and more specifically, to a monitoring device and method for a hydraulic oil system of a gas turbine. Background Art

[0002] The hydraulic oil system of a gas turbine is the core system that controls the actions of key components of the gas turbine (such as IGV guide vanes, fuel valves, anti-surge valves, etc.). Its function is to provide stable and high-pressure hydraulic power for the actuator, and to realize oil circulation and pressure regulation through the oil return pipeline.

[0003] The existing hydraulic oil system of gas turbines has a risk of single-point failure. For example, faults such as coil aging, cable disconnection, or valve jamming will cause the loss of hydraulic oil pressure, which will in turn cause misoperation of the protection. The first solenoid valve (20FG-1) and the second solenoid valve (20TV-1) in the hydraulic oil system close the oil return pipeline by energizing the coil to establish oil pressure. If any solenoid valve loses power, the oil return will be conducted, resulting in pressure release. Therefore, the coils of the first solenoid valve and the second solenoid valve must be continuously energized during operation. Long-term operation will cause problems such as coil aging, which will in turn cause misoperation of the gas turbine protection. Summary of the Invention

[0004] The monitoring device and method for a hydraulic oil system of a gas turbine provided by the present invention aim to solve the problem that the existing hydraulic oil system of gas turbines will cause problems such as coil aging after long-term operation, which will in turn cause misoperation of the gas turbine protection.

[0005] To achieve the above object, the present invention provides the following technical solution: A monitoring device for a hydraulic oil system of a gas turbine, including a redundant solenoid valve group installed on the fuel tank. A fuel supply mechanism is installed on the fuel tank, and an oil return pipeline is installed on the fuel supply mechanism. The redundant solenoid valve group is connected to the oil return pipeline. The redundant solenoid valve group includes a first solenoid valve, a second solenoid valve, a first redundant solenoid valve, and a second redundant solenoid valve. The first solenoid valve, the second solenoid valve, the first redundant solenoid valve, and the second redundant solenoid valve are connected in series. A first monitoring point and a second monitoring point are provided on the series circuit of the first redundant solenoid valve and the second redundant solenoid valve, and the second monitoring point is connected in series between the first redundant solenoid valve and the second redundant solenoid valve. When the first redundant solenoid valve, the second redundant solenoid valve, the first solenoid valve, and the second solenoid valve are all energized, the oil return pipeline of the fuel supply mechanism is blocked. An actuator is installed on the fuel supply mechanism. Pressure transmitters are installed on the pipelines of the first monitoring point, the second monitoring point, and the actuator. The pressure transmitters at the first monitoring point and the second monitoring point are used to monitor the pressure between the valves, and the pressure transmitter on the actuator is used to monitor the actual working pressure.

[0006] In a preferred embodiment, an oil pump is installed on the oil tank, and a pipeline is connected between the oil pump and the oil supply mechanism. A mounting frame is also installed on the oil tank, an operating panel is installed on the mounting frame, a control mechanism is installed on the operating panel, and the control mechanism is electrically signal-connected to the redundant solenoid valve group, the oil supply mechanism and the actuator, respectively.

[0007] In a preferred embodiment, the control mechanism includes a control module and a communication module. The control module includes a contactor for controlling the on and off of the power supply of the solenoid valve. The control module also includes a terminal block and a relay to realize signal distribution and logical association. The communication module includes a triple redundant PD IO card, a PAI C card and an integrated display.

[0008] In a preferred embodiment, the control mechanism also includes a real-time monitoring module, a fault diagnosis module and an alarm and protection module. The real-time monitoring module is used to display the power-on or power-off status of the solenoid valve, the coil current value and the pressure value of each section of the pipeline. The fault diagnosis module is used to perform current analysis and pressure analysis. The alarm and protection module is used for emergency alarms and triggering protection actions.

[0009] In a preferred embodiment, an oil filter mechanism is installed on the oil tank, and the oil filter mechanism includes an oil filter housing, an oil inlet hole is opened on the surface of the oil filter housing, a filter element is installed inside the oil filter housing, and a debubble assembly is provided on the periphery of the oil filter housing. The debubble assembly includes a transition sleeve, and the inner side height of the transition sleeve close to the oil filter housing is lower than the outer side height.

[0010] In a preferred embodiment, a transition cavity is provided inside the transition sleeve, a temperature regulating tube is fixed inside the transition cavity, a hollow seat is fixed at the bottom of the transition sleeve, a temperature regulating chamber is provided inside the hollow seat, and the temperature regulating chamber is connected to the temperature regulating tube.

[0011] In a preferred embodiment, an exhaust plate is fixedly provided on the lower side of the transition sleeve, an exhaust cavity is opened inside the exhaust plate, an exhaust hole is opened on the top side of the exhaust plate, and the exhaust hole is connected with the interior of the transition cavity, an exhaust chamber is provided on one side of the temperature-control room, and a pipeline is connected between the exhaust chamber and the exhaust cavity.

[0012] In a preferred embodiment, a drive box is installed at the bottom of the oil filter housing, and a drive gear is provided on one side of the drive box. The drive gear is transmission-connected to one side of the exhaust plate. A connecting sleeve is fixedly provided on the outer wall of the oil filter housing, and the connecting sleeve is located obliquely below the oil inlet hole. A slide groove is provided on the side of the connecting sleeve close to the exhaust plate, and one side of the exhaust plate is slidably arranged inside the slide groove.

[0013] In a preferred embodiment, a sealing seat is detachably mounted on the top of the oil filter housing, an oil outlet, a bypass port and a monitoring port are provided on the outer side of the sealing seat, and the oil outlet, bypass port and monitoring port are staggered.

[0014] The present invention also provides a monitoring method for a monitoring device of a gas turbine hydraulic oil system, including the following steps:

[0015] S1: Data acquisition and synchronization: Collect analog signals of pressure transmitters and current transformers through PAI C card components, and the PD IO card components output control signals to ensure the synchronous operation of the redundant solenoid valve group and record the action timestamp;

[0016] S2: Real-time status monitoring: When the current exceeds the limit or returns to zero, it is determined that there is a coil failure or power interruption;

[0017] S3: Fault diagnosis: Judge single-valve failure or double-valve failure;

[0018] S4: Alarm and maintenance response: In case of single-valve failure, the system continues to operate and prompts for planned maintenance; in case of double-valve failure or abnormal actuator pressure, trigger the protection action.

[0019] S5: Data storage: Store pressure, current and alarm records.

[0020] The beneficial effects of the present invention are as follows:

[0021] The present invention effectively avoids the occurrence of risk situations such as the inability of the gas turbine hydraulic oil system to normally engage the brake due to the failure or performance attenuation of a single solenoid valve coil, or the reduction of the hydraulic oil pressure during operation leading to the load shedding or tripping of the unit.

[0022] By arranging a processing sleeve outside the oil filter housing, the present invention eliminates air and foam in the hydraulic oil, thereby avoiding the violent pressure difference fluctuation of the air and foam entering and discharging the oil filter housing due to gas-liquid two-phase flow, effectively preventing the occurrence of false blockage phenomena, having the advantages of static settlement to remove large foam, vacuum degassing to treat dissolved air and small bubbles, reducing equipment load, reducing the operation time of vacuum degassing equipment, extending service life, not requiring continuous operation of vacuum equipment, and saving energy and maintenance costs. Description of the Drawings

[0023] Figure 1 It is a schematic installation diagram of the redundant solenoid valve group of the present invention.

[0024] Figure 2 It is a schematic installation diagram of the pressure transmitter of the present invention.

[0025] Figure 3 It is a schematic overall structure diagram of the present invention.

[0026] Figure 4 It is a schematic top view of the overall structure of the present invention.

[0027] Figure 5 It is a schematic structure diagram of the oil filtering mechanism of the present invention.

[0028] Figure 6 Schematic cross-sectional structure diagram of the oil filter housing of the present invention.

[0029] Figure 7 Schematic cross-sectional structure diagram of the air extraction plate of the present invention.

[0030] Figure 8 Schematic cross-sectional structure diagram of the transition sleeve of the present invention.

[0031] Figure 9 Schematic cross-sectional structure diagram of the hollow seat of the present invention.

[0032] Figure 10 Schematic cross-sectional structure diagram of the drive box of the present invention.

[0033] Figure 11 Schematic diagram of the monitoring method of the present invention.

[0034] Reference numerals are: 1, redundant solenoid valve group; 11, first redundant solenoid valve; 12, second redundant solenoid valve; 13, first monitoring point; 14, second monitoring point; 15, pressure transmitter; 2, fuel tank; 3, fuel supply mechanism; 4, oil pump; 5, mounting bracket; 6, operation panel; 7, control mechanism; 8, actuator; 9, oil filter mechanism; 91, oil filter housing; 911, oil inlet hole; 912, filter element; 92, sealing seat; 921, oil outlet; 922, bypass port; 923, monitoring port; 93, defoaming component; 931, air extraction plate; 9311, air extraction chamber; 9312, air extraction hole; 932, transition sleeve; 933, transition chamber; 934, temperature regulating pipe; 94, connecting sleeve; 95, hollow seat; 951, air extraction chamber; 952, temperature regulating chamber; 96, drive box; 961, drive gear. Detailed implementation manners

[0035] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific implementation manners are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0036] Refer to the attached drawings of the specification Figure 1 and Figure 2, A monitoring device for a gas turbine hydraulic oil system, comprising a redundant solenoid valve group 1 installed on the oil tank 2. An oil supply mechanism 3 is installed on the oil tank 2, and an oil return pipeline is installed on the oil supply mechanism 3. The redundant solenoid valve group 1 is connected to the oil return pipeline. The redundant solenoid valve group 1 includes a first solenoid valve, a second solenoid valve, a first redundant solenoid valve 11, and a second redundant solenoid valve 12, and the first solenoid valve, the second solenoid valve, the first redundant solenoid valve 11, and the second redundant solenoid valve 12 are connected in series. A first monitoring point 13 and a second monitoring point 14 are provided on the series circuit of the first redundant solenoid valve 11 and the second redundant solenoid valve 12, and the second monitoring point 14 is connected in series between the first redundant solenoid valve 11 and the second redundant solenoid valve 12; when the first redundant solenoid valve 11, the second redundant solenoid valve 12, the first solenoid valve, and the second solenoid valve are simultaneously energized, the oil return pipeline of the oil supply mechanism 3 is blocked; an actuator 8 is installed on the oil supply mechanism 3, and pressure transmitters 15 are installed on the pipelines of the first monitoring point 13, the second monitoring point 14, and the actuator 8. The pressure transmitters 15 on the first monitoring point 13 and the second monitoring point 14 are used to monitor the pressure between valves, and the pressure transmitter 15 on the actuator 8 is used to monitor the actual working pressure.

[0037] It should be noted that the first redundant solenoid valve 11 and the second redundant solenoid valve 12 are powered by a 110V DC power supply independent of the original solenoid valve to avoid both valves losing power and tripping the machine in case of a single power supply failure. A current transformer is installed on the power supply circuit of the redundant solenoid valve group 1 for real-time acquisition of the coil working current signal. The oil tank 2 includes an oil supply chamber and an oil return chamber.

[0038] Furthermore, an oil pump 4 is installed on the oil tank 2, and the oil pump 4 is connected to the oil supply mechanism 3 through a pipeline. An installation frame 5 is also installed on the oil tank 2, an operation panel 6 is installed on the installation frame 5, and a control mechanism 7 is installed on the operation panel 6. The control mechanism 7 is electrically connected to the redundant solenoid valve group 1, the oil supply mechanism 3, and the actuator 8 respectively.

[0039] It should be noted that the oil pump 4 is used to transport the hydraulic oil in the oil tank 2, and the control mechanism 7 is used to control the overall working state.

[0040] Still further, the control mechanism 7 includes a control module and a communication module. The control module includes a contactor for controlling the on-off of the solenoid valve power supply. The control module also includes a terminal block and a relay to achieve signal distribution and logical association. The communication module includes a triple-redundant PDIO card, a PAI C card, and an integrated display.

[0041] It should be noted that the triple-redundant PDIO card is used to output solenoid valve control signals to ensure the synchronous operation of the redundant solenoid valve group 1. The PAIC card is used to receive the analog signals of the pressure transmitter 15 and the current transformer, and the integrated display is used to integrally display the states of each solenoid valve, the pressure curve, the current data, and the alarm information.

[0042] Furthermore, the control mechanism 7 further includes a real-time monitoring module, a fault diagnosis module, and an alarm and protection module. The real-time monitoring module is used to display the energized or de-energized state of the solenoid valve, the coil current value, and the pipeline pressure values of each section. The fault diagnosis module is used to perform current analysis and pressure analysis. The alarm and protection module is used for emergency alarm and triggering protection actions.

[0043] It should be noted that the real-time monitoring module supports querying the historical data trend charts of pressure and current. The current analysis determines coil aging, disconnection, or jamming through current thresholds. The pressure analysis indicates internal leakage or failure of a single solenoid valve when the pressure between valves is abnormal, such as when the pressure drops, and indicates blockage or leakage of the hydraulic system when the pressure of the actuator 8 is abnormal. The alarm and protection module triggers early warnings in case of single-valve failures and triggers protection actions in case of simultaneous failures of two valves, such as reducing the load or shutting down the machine, and triggers an emergency alarm when the power supply is de-energized or the signal is lost.

[0044] In this embodiment, the implementation scenario is specifically as follows: In the original, first solenoid valve, and second solenoid valve circuits, a first redundant solenoid valve 11 and a second redundant solenoid valve 12 of the same model are connected in series to form a redundant solenoid valve group 1. The redundant solenoid valve group 1 is energized or de-energized synchronously to ensure that the hydraulic oil pressure can still be maintained in case of a single solenoid valve failure. The pressure of each section is monitored in real time through the pressure transmitter 15 to judge the working state of the valve group, and the analog signal is sent to the Mark VIe system. The following transformations are carried out on the control system. Three-redundancy PDIO and PAIC card modules and terminal boards are added in the Mark VI e control system to support the signal processing of the newly added solenoid valves and sensors. Terminal blocks, small contactors, and current monitoring devices are installed to realize the power supply control and status feedback of the solenoid valves, adjust the control logic, modify the turning-on logic to make the newly added DO channels act synchronously with the original solenoid valves, ensure that the redundant solenoid valve group 1 is energized simultaneously, add a solenoid valve failure alarm logic, judge single-valve failures through current monitoring and pressure data, integrate the status of the new valves, real-time pressure data, and fault alarm information in the operation interface to improve the monitoring ability, analyze the sealing performance of the solenoid valves through the PT data of the redundant solenoid valve group 1 and the actuator 8, and give early warnings about jamming or internal leakage problems. The overall reliability is improved. The series redundancy design eliminates the risk of single-point failures. When any solenoid valve fails, the system can still maintain the oil pressure, avoiding tripping or load shedding. The ability of fault prediction, dual monitoring of pressure and current realizes online diagnosis of the health status of solenoid valves and supports preventive maintenance. Power redundancy, the independent power supply design prevents the simultaneous de-energization of two valves caused by power supply failures. Compatibility and expandability, based on the hardware expansion and software logic adjustment of MarkVIe, ensure seamless integration with the original system, and can effectively avoid risks such as the inability of the gas turbine hydraulic oil system to be normally turned on due to the failure or performance attenuation of a single solenoid valve coil, or the reduction of the hydraulic oil pressure during operation leading to load shedding or tripping of the unit.

[0045] The core components of the hydraulic oil system include a hydraulic power unit, a control and execution unit, a filtration and cooling unit, and a monitoring and protection unit. The filtration and cooling unit consists of a return oil filter and an oil cooler. The pressure difference of the return oil filter, that is, the pressure difference between the inlet and outlet of the filter, is the core index for judging the degree of filter element blockage. Under normal pressure difference, for a new filter element, the pressure difference is usually ≤0.2 bar. When the pressure difference of the filter element to be replaced ≥0.5 bar, it indicates that the filter element is severely blocked and needs to be replaced immediately to avoid the bypass valve being forced to open and pollutants entering the system. During actual operation, false blockage may occur in the return oil filter. False blockage refers to the situation where although the pressure difference increases and triggers the bypass valve, the actual filter element is not really blocked. The filter element itself is not actually blocked by pollutants, but due to other reasons, the pressure difference of the return oil filter increases, triggering the opening of the bypass valve. This situation will affect the filtration effect and even cause system pollution, misleading maintenance personnel to replace the filter element or misjudge the system status. The reasons for false blockage include air and foam mixed in the oil. When flowing through the filter element, due to the two-phase flow of gas and liquid, the local resistance suddenly increases, and the pressure difference instantaneously rises.

[0046] Refer to the attached instructions Figures 3 to 10 Figures 3 to 10

[0047] It should be noted that the hydraulic oil in the return pipeline enters the inside of the transition sleeve 932 from the high side, flows out of the transition sleeve 932 from the low side, and finally enters the inside of the filter housing 91 through the oil inlet hole 911.

[0048] Furthermore, a transition chamber 933 is provided inside the transition sleeve 932. A temperature control pipe 934 is fixedly provided inside the transition chamber 933. A hollow seat 95 is fixedly provided at the bottom of the transition sleeve 932. A temperature control chamber 952 is provided inside the hollow seat 95. The temperature control chamber 952 is communicated with the temperature control pipe 934.

[0049] It should be noted that the height of the temperature control pipe 934 is less than the height of the low side of the transition sleeve 932.

[0050] Still further, an air extraction plate 931 is fixedly provided on the low side of the transition sleeve 932. An air extraction chamber 9311 is provided inside the air extraction plate 931. An air extraction hole 9312 is provided on one side of the top of the air extraction plate 931, and the air extraction hole 9312 is communicated with the inside of the transition chamber 933. An air extraction chamber 951 is provided on one side of the temperature control chamber 952. The air extraction chamber 951 is communicated with the air extraction chamber 9311 through a pipeline.

[0051] It should be noted that the air extraction hole 9312 is located at the upper part of the lower side of the transition sleeve 932.

[0052] Furthermore, a drive box 96 is installed at the bottom of the oil filter housing 91. A drive gear 961 is provided on one side of the drive box 96. The drive gear 961 is in transmission connection with one side of the air extraction plate 931. A connecting sleeve 94 is fixedly provided on the outer side wall of the oil filter housing 91, and the connecting sleeve 94 is located obliquely below the oil inlet hole 911. A chute is opened on one side of the connecting sleeve 94 close to the air extraction plate 931, and one side of the air extraction plate 931 is slidably arranged inside the chute.

[0053] It should be noted that a rack is provided on the inner side of the air extraction plate 931. The drive gear 961 is in meshing transmission with the rack. When the air extraction plate 931 moves vertically, the chute plays a role of positioning and guiding.

[0054] Furthermore, a sealing seat 92 is detachably installed at the top of the oil filter housing 91. An oil outlet 921, a bypass port 922 and a monitoring port 923 are opened on the outer side of the sealing seat 92, and the oil outlet 921, the bypass port 922 and the monitoring port 923 are arranged in a staggered manner.

[0055] It should be noted that the oil outlet 921 is used to discharge the hydraulic oil inside the oil filter housing 91, the bypass port 922 is used to install a bypass valve, and the monitoring port 923 is used to connect a pressure monitoring head.

[0056] In this embodiment, the implementation scenario is specifically as follows: The hydraulic oil in the oil return pipeline enters the oil return cavity of the oil tank 2. The hydraulic oil first passes through the defoaming component 93 step by step. The hydraulic oil enters the transition cavity 933 and stands still. The temperature of the hydraulic oil inside the transition cavity 933 is adjusted through the temperature regulating pipe 934. By adjusting the temperature of the hydraulic oil within the range of 20°C - 40°C, the normal flow of the hydraulic oil is ensured. If the temperature of the hydraulic oil is low, the viscosity will increase, and the dissipation speed of air and foam in the hydraulic oil during standing will be slow. After standing, the air and foam float to the upper layer of the hydraulic oil, that is, there is air and foam in the upper part of the transition cavity 933. The air and foam in the upper part of the transition cavity 933 are extracted through the air extraction hole 9312, and the air and foam are discharged through the air extraction cavity 9311 and the air extraction chamber 951. The drive box 96 drives the air extraction plate 931 to move up and down through the drive gear 961 to adjust the height of the transition sleeve 932 so as to adapt to the liquid level of the oil return cavity of the oil tank 2, so that the hydraulic oil slowly enters the transition cavity 933. Overall, by arranging a treatment sleeve on the outer side of the oil filter housing 91, the air and foam in the hydraulic oil are eliminated, thereby avoiding the drastic pressure difference fluctuation of the hydraulic oil entering and discharging the oil filter housing 91 caused by the gas-liquid two-phase flow of air and foam, effectively preventing the occurrence of false blockage phenomenon, having the advantages of static settlement to remove large foam, vacuum degassing to treat dissolved air and small bubbles, reducing the equipment load, reducing the operation time of the vacuum degassing equipment, prolonging the service life, not requiring continuous operation of the vacuum equipment, saving energy and maintenance costs.

[0057] Referring to the attached drawings of the specification Figure 11 The present invention also provides a monitoring method for a monitoring device of a gas turbine hydraulic oil system, including the following steps:

[0058] S1: Data acquisition and synchronization: Collect analog signals of the pressure transmitter 15 and the current transformer through the PAIC card, and the PDIO card outputs a control signal to ensure the synchronous action of the redundant solenoid valve group 1 and record the action timestamp;

[0059] S2: Real-time status monitoring: When the current exceeds the limit or returns to zero, it is determined that there is a coil failure or a power supply interruption;

[0060] S3: Fault diagnosis: Judge single-valve fault or double-valve fault;

[0061] S4: Alarm and maintenance response: In case of a single-valve fault, the system continues to operate and prompts for planned maintenance. In case of a double-valve fault or abnormal pressure of the actuator 8, a protection action is triggered.

[0062] S5: Data storage: Store pressure, current and alarm records.

[0063] It should be noted that the pressure of the redundant solenoid valve group 1 is denoted as PT1, which should be consistent with the system pressure under normal conditions. If it drops, it indicates an internal leak of the single valve. The pressure of the actuator 8 is denoted as PT2, which matches the load command. When abnormal, it indicates a system leak or a fault of the actuator 8.

[0064] Judgment of single-valve fault: If the pressure of PT1 drops and the current of the corresponding solenoid valve is normal, it is determined that the valve seal fails, such as an internal leak. If the current is abnormal (such as zero) and the pressure of PT1 is normal, it is determined that the other redundant valve works normally and the current valve has a power supply or coil fault.

[0065] Judgment of double-valve fault: When the pressures of PT1 and PT2 drop suddenly at the same time and the currents of the double valves are abnormal, an emergency protection logic is triggered.

[0066] Maintenance plan: Analyze the service life cycle of the solenoid valve according to the historical data trend and formulate a preventive replacement plan.

[0067] The following analysis is carried out based on the stored data: Analysis of the correlation between the action frequency of the solenoid valve and its service life, prediction of the leakage trend of the hydraulic system, and evaluation of the power supply stability through the current fluctuation data.

[0068] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A monitoring device for a hydraulic oil system of a gas turbine, characterized in that: It includes a redundant solenoid valve group (1) installed on a fuel tank (2). A fuel supply mechanism (3) is installed on the fuel tank (2). An oil return pipeline is installed on the fuel supply mechanism (3). The redundant solenoid valve group (1) is connected to the oil return pipeline. The redundant solenoid valve group (1) includes a first solenoid valve, a second solenoid valve, a first redundant solenoid valve (11) and a second redundant solenoid valve (12), and the first solenoid valve, the second solenoid valve, the first redundant solenoid valve (11) and the second redundant solenoid valve (12) are connected in series. A first monitoring point (13) and a second monitoring point (14) are provided on the series circuit of the first redundant solenoid valve (11) and the second redundant solenoid valve (12), and the second monitoring point (14) is connected in series between the first redundant solenoid valve (11) and the second redundant solenoid valve (12). When the first redundant solenoid valve (11), the second redundant solenoid valve (12), the first solenoid valve and the second solenoid valve are energized simultaneously, the oil return pipeline of the fuel supply mechanism (3) is blocked. An actuator (8) is installed on the fuel supply mechanism (3). Pressure transmitters (15) are installed on the pipelines of the first monitoring point (13), the second monitoring point (14) and the actuator (8). The pressure transmitters (15) on the first monitoring point (13) and the second monitoring point (14) are used to monitor the pressure between valves, and the pressure transmitter (15) on the actuator (8) is used to monitor the actual working pressure.

2. The monitoring device of a gas turbine hydraulic oil system according to claim 1, characterized in that: A fuel pump (4) is installed on the fuel tank (2), and the fuel pump (4) is connected to the fuel supply mechanism (3) through a pipeline. An installation frame (5) is also installed on the fuel tank (2). An operation panel (6) is installed on the installation frame (5). A control mechanism (7) is installed on the operation panel (6), and the control mechanism (7) is electrically connected to the redundant solenoid valve group (1), the fuel supply mechanism (3) and the actuator (8) respectively.

3. The monitoring device for a gas turbine hydraulic oil system according to claim 2, characterized in that: The control mechanism (7) includes a control module and a communication module. The control module includes a contactor, a terminal block and a relay. The communication module includes a triple-redundant PD IO card, a PAI C card and an integrated display.

4. The monitoring device for a gas turbine hydraulic oil system according to claim 3, characterized in that: The control mechanism (7) further includes a real-time monitoring module, a fault diagnosis module and an alarm and protection module. The real-time monitoring module is used to display the energized or de-energized state of the solenoid valve, the coil current value and the pressure values of each pipeline section. The fault diagnosis module is used to perform current analysis and pressure analysis. The alarm and protection module is used for emergency alarm and triggering protection actions.

5. The monitoring device for a gas turbine hydraulic oil system according to claim 4, characterized in that: A oil filtering mechanism (9) is installed on the fuel tank (2). The oil filtering mechanism (9) includes an oil filtering housing (91). An oil inlet hole (911) is provided on the surface of the oil filtering housing (91). A filter element (912) is installed inside the oil filtering housing (91). A defoaming component (93) is provided on the outer periphery of the oil filtering housing (91). The defoaming component (93) includes a transition sleeve (932), and the inner side of the transition sleeve (932) close to the oil filtering housing (91) is lower than the outer side height.

6. The monitoring device for a gas turbine hydraulic oil system according to claim 5, characterized in that: Inside the transition sleeve (932) is provided with a transition cavity (933). Inside the transition cavity (933) is fixedly provided with a temperature control pipe (934). At the bottom of the transition sleeve (932) is fixedly provided with a hollow seat (95). Inside the hollow seat (95) is provided with a temperature control chamber (952). The temperature control chamber (952) is in communication with the temperature control pipe (934).

7. The monitoring device for a gas turbine hydraulic oil system according to claim 6, characterized in that: On the lower side of the transition sleeve (932) is fixedly provided with an air extraction plate (931). Inside the air extraction plate (931) is opened an air extraction cavity (9311). On one side of the top of the air extraction plate (931) is opened an air extraction hole (9312), and the air extraction hole (9312) is in communication with the inside of the transition cavity (933). On one side of the temperature control chamber (952) is provided an air extraction chamber (951). The air extraction chamber (951) is in pipeline communication with the air extraction cavity (9311).

8. The monitoring device for a gas turbine hydraulic oil system according to claim 7, characterized in that: At the bottom of the oil filter housing (91) is installed a driver box (96). On one side of the driver box (96) is provided a driving gear (961). The driving gear (961) is in transmission connection with one side of the air extraction plate (931). On the outer side wall of the oil filter housing (91) is fixedly provided a connecting sleeve (94), and the connecting sleeve (94) is located obliquely below the oil inlet hole (911). On one side of the connecting sleeve (94) close to the air extraction plate (931) is opened a sliding groove. One side of the air extraction plate (931) is slidably arranged inside the sliding groove.

9. The monitoring device of a gas turbine hydraulic oil system according to claim 8, characterized in that: On the top of the oil filter housing (91) is detachably installed a sealing seat (92). On the outer side of the sealing seat (92) are opened an oil outlet (921), a bypass port (922) and a monitoring port (923), and the oil outlet (921), the bypass port (922) and the monitoring port (923) are arranged in a staggered manner.

10. A monitoring method for the monitoring device of the hydraulic oil system of a gas turbine as described in claim 9, characterized in that, Including the following steps: S1: Data acquisition and synchronization: Collect the analog signals of the pressure transmitter (15) and the current transformer through the PAIC card component. The PDIO card component outputs a control signal to ensure the synchronous action of the redundant solenoid valve group (1), and record the action timestamp. S2: Real-time status monitoring: When the current exceeds the limit or returns to zero, it is determined that the coil is faulty or the power supply is interrupted. S3: Fault diagnosis: Judge whether it is a single valve fault or a double valve fault. S4: Alarm and maintenance response: In case of a single valve fault, the system continues to operate and prompts for planned maintenance. In case of a double valve fault or abnormal pressure of the actuator (8), trigger a protection action. S5: Data storage: Store the pressure, current and alarm records.

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