Oil seal device for a gas turbine starter

Abstract

The present invention discloses an oil sealing device for a gas turbine starter, which uses an oil sealing oil supply system to supply oil sealing oil to the fuel system of the starter, uses a lubricating oil supply system to supply lubricating oil to the lubricating oil system of the starter, and at the same time uses a power supply and control system to provide a stable power supply for the starter, and can control the oil sealing mode of the starter to switch between a static oil sealing mode, a dynamic oil sealing mode and a cold operation mode, so that the gas turbine starter can be separately oil sealed on an outfield ground to prevent the starter from exceeding the storage period, and moreover, any one of the static oil sealing mode, the dynamic oil sealing mode and the cold operation mode can be selected according to the actual oil sealing requirements, greatly improving the versatility of the oil sealing device.

Description

Technical Field

[0001] The present invention relates to the technical field of outfield maintenance of starters, and in particular, to an oil seal device for a gas turbine starter. Background Art

[0002] As a mechanical airborne device, a gas turbine starter (hereinafter referred to as "starter") is installed on multiple types of aircraft. It has an independent fuel and lubricating oil system. When the starter is removed from the aircraft, in order to prevent abnormal situations such as rust in the fuel system and lubricating oil system, internal oil sealing treatment needs to be carried out within 24 hours after the starter is removed, so that the fuel system inside the starter is filled with oil seal oil and the lubricating oil system is filled with lubricating oil, thereby realizing long-term oil seal storage of the starter. At present, the oil seal method for the starter is in-aircraft oil seal. When the starter is installed on the aircraft, the main engine oil seal device of the aircraft and the aircraft operation platform are used to carry out in-aircraft oil seal. However, in-aircraft oil seal has the following disadvantages:

[0003] 1. The joint of the main engine oil seal device needs to be modified. At the same time, the main engine oil seal device and the aircraft operation platform are relatively heavy and have a complex structure, cannot be placed independently on the ground for independent operation, and require a long pipeline to connect to the starter located on the back of the aircraft, making the operation very inconvenient.

[0004] 2. The aircraft end does not have a starter oil seal control program. It is necessary to manually change the on-state of the starter ignition system to prevent safety problems caused by starter ignition or high voltage electricity. At the same time, a large number of aircraft pipelines need to be disassembled and a guiding pipe method is used to collect the remaining oil, which greatly increases the workload of maintenance personnel.

[0005] 3. During the normal operation of the starter, the fuel in the fuel system is injected into the combustion chamber for combustion, forming high-temperature and high-pressure gas that acts on the turbine to do work, and then the gas is discharged from the exhaust port. When oil sealing the fuel system, the oil seal oil will fill the entire fuel system and be injected into the combustion chamber. At this time, the oil seal oil will not burn but will be discharged from the exhaust port through the turbine. A large amount of oil seal oil will be blown out from the exhaust port of the starter and fall back into the aircraft fuselage and the main engine nacelle, making it extremely difficult to clean and posing a potential fire hazard during the next test run.

[0006] More importantly, when the starter is removed and stored on the ground after in-aircraft oil seal, which is complex and has great potential hazards, it has an oil seal storage period of only 3 months. Once the oil seal storage period is reached, it needs to be oil sealed again immediately. At present, there is no equipment that can realize the ground oil seal of the fuel and lubricating oil systems of the starter, which will directly lead to the starter exceeding the storage limit. Summary of the Invention

[0007] The present invention provides an oil seal device for a gas turbine starter to solve the technical problem that the prior art cannot realize ground oil seal of the starter.

[0008] According to one aspect of the present invention, there is provided an oil seal device for a gas turbine starter, comprising:

[0009] A power supply and control system for providing a stable power supply to the starter and controlling the switching of the oil seal mode of the starter among a static oil seal mode, a dynamic oil seal mode, and a cold operation mode;

[0010] An oil seal oil supply system for supplying oil seal oil to the fuel system of the starter in the static oil seal mode or the dynamic oil seal mode;

[0011] An oil supply system for supplying lubricating oil to the lubricating oil system of the starter in the dynamic oil seal mode or the cold operation mode.

[0012] Further, the power supply and control system includes a power supply, a start-stop switch, a first relay, a motor switch, an oil supply switch, and an oil pump switch. The power supply is used to provide a stable DC power supply to the electric booster pump of the oil seal oil supply system, the starter motor, the parking solenoid valve and the status reset solenoid valve installed on the starter. Among them, the electric booster pump, the starter motor, the parking solenoid valve and the status reset solenoid valve are connected in parallel and then in series with the start-stop switch. The start-stop switch is used to control the start and stop of the entire system. The first relay is used to control the on-off of the power supply branch where the starter motor is located. The motor switch is arranged on the power supply branch where the first relay is located and is used to control the start and stop of the starter motor. The parking solenoid valve and the status reset solenoid valve are connected in parallel and then in series with the oil supply switch. The oil supply switch is used to control the opening or closing of the fuel outlet of the fuel metering and control accessory of the starter. The oil pump switch is arranged on the power supply branch where the electric booster pump is located.

[0013] Further, when the start-stop switch and the oil pump switch are closed and the motor switch and the oil supply switch are opened, the starter motor does not work, the fuel outlet of the fuel metering and control accessory and the baffle valve of the starter fuel system are both closed, and only the electric booster pump of the oil seal oil supply system supplies oil seal oil to the fuel metering and control accessory of the starter, and only the fuel metering and control accessory of the starter is oil-sealed, so as to realize the static seal of the starter.

[0014] Further, when the start-stop switch, the motor switch, the oil supply switch, and the oil pump switch are closed at the same time, the starter motor works and drives the fuel booster pump and the lubricating oil booster pump in the starter to operate. The fuel outlet of the fuel metering and control accessory and the baffle valve of the starter fuel system are both opened. The electric booster pump of the oil seal oil supply system and the fuel booster pump in the starter together pump oil seal oil to the fuel system of the starter to oil-seal the entire fuel system of the starter. At the same time, the lubricating oil booster pump in the starter pumps lubricating oil to the lubricating oil system of the starter to oil-seal the lubricating oil system of the starter, so as to realize the dynamic oil seal of the starter.

[0015] Further, when the start-stop switch and the motor switch are closed and the fuel supply switch and the oil pump switch are opened, the starter motor operates and drives the fuel booster pump and the lubricating oil booster pump in the starter to run. The electric booster pump of the oil seal oil supply system does not operate. The fuel outlet of the fuel control accessory and the baffle valve of the starter fuel system are both closed. Only the lubricating oil is pumped by the lubricating oil booster pump in the starter from the lubricating oil supply system, and only the lubricating oil system of the starter is oil-sealed, so as to realize the cold operation of the starter.

[0016] Further, it further includes a time relay. The starter motor, the parking solenoid valve and the status reset solenoid valve are connected in parallel and then connected in series with the time relay. The time relay is used to control the power supply branch of the starter motor, the parking solenoid valve and the status reset solenoid valve to be disconnected with a time delay.

[0017] Further, the power supply includes a charging power supply, a battery and a second relay. The charging power supply is used to convert alternating current into direct current. The battery is used to directly provide direct current. The charging power supply and the battery adopt a parallel power supply mode. The second relay is used to control the on-off of the battery charging circuit. The second relay forms a series circuit with the start-stop switch and the charging power supply. When the start-stop switch is closed, the second relay is energized and controls the battery charging circuit to be closed, so as to realize the charging of the battery by the charging power supply.

[0018] Further, it further includes an oil residue collection system for collecting the discharged oil residue during the oil sealing process of the starter.

[0019] Further, the oil residue collection system includes an exhaust guiding device, a guiding pipe and an oil residue collection container. The exhaust guiding device is installed at the exhaust port of the starter and is used to guide the oil seal oil blown out of the exhaust port to a proper direction. The guiding pipe is respectively connected to the fuel vent nozzle, the fuel return nozzle, the lubricating oil return nozzle of the starter, the oil discharge port of the exhaust guiding device and the oil residue collection container.

[0020] Further, both the first relay and the second relay adopt electromagnetic current relays that can withstand a current of 1000A.

[0021] The present invention has the following effects:

[0022] The oil seal device of the gas turbine starter of the present invention uses an oil seal oil supply system to supply oil seal oil to the fuel system of the starter, uses a lubricating oil supply system to supply lubricating oil to the lubricating oil system of the starter, and at the same time uses a power supply and control system to provide a stable power supply for the starter, and can control the oil seal mode of the starter to switch between a static oil seal mode, a dynamic oil seal mode and a cold operation mode. Thus, the gas turbine starter can be separately oil sealed on an outdoor site to prevent the starter from exceeding the storage period. Moreover, any one of the static oil seal mode, the dynamic oil seal mode and the cold operation mode can be selected according to the actual oil seal requirements, greatly improving the versatility of the oil seal device.

[0023] In addition to the purposes, features and advantages described above, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 is a schematic diagram of the principle of the oil seal device of the gas turbine starter of the preferred embodiment of the present invention.

[0026] Figure 2 is a schematic circuit diagram of the power supply and control system of the preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The embodiments of the present invention will be described in detail below with reference to the drawings, but the present invention can be implemented in many different ways defined and covered by the following.

[0028] It can be understood that, as Figure 1As shown in the figure, a preferred embodiment of the present invention provides an oil sealing device for a gas turbine starter, which is used for performing oil sealing work on the gas turbine starter at an outfield site. Among them, as a mechanical airborne device, the starter is designed with a fuel booster pump and a lubricating oil booster pump by itself, and can be driven by the starter motor, but does not have the functions of self-supplying electric energy and an external fuel tank. To achieve the oil sealing work of the starter, on the one hand, an external energy system is required to provide a stable power supply for the starter to drive the starter motor to work, and to control the parking solenoid valve and the status reset solenoid valve installed on the starter to be turned on to control the opening of the fuel system oil circuit. On the other hand, a system for continuously supplying clean oil sealing medium needs to be designed externally. Specifically, the oil sealing device includes a power supply and control system, an oil sealing oil supply system, and a lubricating oil supply system. The power supply and control system is used to provide a stable power supply for the starter and control the switching of the starter oil sealing mode among the static oil sealing mode, the dynamic oil sealing mode, and the cold running mode. The oil sealing oil supply system is used to provide oil sealing oil for the fuel system of the starter in the static oil sealing mode or the dynamic oil sealing mode. The lubricating oil supply system is used to provide lubricating oil for the lubricating oil system of the starter in the dynamic oil sealing mode or the cold running mode. Thus, the corresponding oil sealing mode can be selected through the power supply and control system according to the actual oil sealing requirements to perform oil sealing operations on the fuel system and / or the lubricating oil system of the starter.

[0029] It can be understood that the oil sealing device of the gas turbine starter in this embodiment uses the oil sealing oil supply system to provide oil sealing oil for the fuel system of the starter, uses the lubricating oil supply system to provide lubricating oil for the lubricating oil system of the starter, and at the same time uses the power supply and control system to provide a stable power supply for the starter, and can control the switching of the starter oil sealing mode among the static oil sealing mode, the dynamic oil sealing mode, and the cold running mode. Thus, the gas turbine starter can be separately oil sealed at the outfield site to prevent the starter from exceeding the storage period. Moreover, any one of the static oil sealing mode, the dynamic oil sealing mode, and the cold running mode can be selected according to the actual oil sealing requirements, greatly improving the versatility of the oil sealing device.

[0030] Among them, the oil seal oil supply system specifically includes an oil seal oil tank, an electric booster pump, an oil seal oil filter, and an oil pressure gauge. The oil seal oil tank, the electric booster pump, and the oil seal oil filter are connected in sequence and then connected to the fuel system inlet of the starter through a quick-release joint. The oil seal oil tank is used to store oil seal oil, specifically a 5L stainless steel tank. The electric booster pump is used to extract oil seal oil from the oil seal oil tank for pressurized transportation. The oil seal oil filter is used to filter the transported oil seal oil. The oil pressure gauge is used to detect the pumping pressure of the oil seal oil in real time. The lubricating oil supply system includes a lubricating oil tank and a lubricating oil filter. The lubricating oil tank is used to store lubricating oil, specifically a 5L stainless steel tank. The lubricating oil tank is connected to the lubricating oil system inlet of the starter through a quick-release joint. The lubricating oil filter is arranged on the lubricating oil pipeline for filtering the lubricating oil.

[0031] It can be understood that, such as Figure 2As shown, the power supply and control system includes a power supply, a start-stop switch, a first relay, a motor switch, a fuel supply switch, and an oil pump switch. The power supply is used to provide a stable DC power supply for the electric booster pump, starter motor, parking solenoid valve and status reset solenoid valve of the oil seal oil supply system. Among them, the electric booster pump, starter motor, parking solenoid valve and status reset solenoid valve are connected in parallel and then connected in series with the start-stop switch. The start-stop switch is used to control the start and stop of the entire system. The first relay is used to control the on-off of the power supply branch where the starter motor is located. The motor switch is arranged on the power supply branch where the first relay is located and is used to control the start and stop of the starter motor. The parking solenoid valve and the status reset solenoid valve are connected in parallel and then connected in series with the fuel supply switch. The fuel supply switch is used to control the opening or closing of the fuel outlet of the fuel regulation accessory of the starter. The oil pump switch is arranged on the power supply branch where the electric booster pump is located. Among them, a baffle valve is provided in the fuel system of the starter. When it is necessary to oil seal the entire fuel system of the starter, it is necessary to turn on the parking solenoid valve and the status reset solenoid valve to make the solenoid valve attract the baffle valve to open the fuel system oil circuit. It can be understood that when the motor switch is closed, the first relay is energized and closed, thereby controlling the power supply branch where the starter motor is located to be connected, and the starter motor can start normally; when the motor switch is opened, the first relay is de-energized and opened, and the power supply branch where the starter motor is located is disconnected, and the starter motor cannot start. When the fuel supply switch is turned off, the fuel outlet of the fuel regulation accessory of the starter is closed, and the oil seal oil cannot enter the subsequent oil circuit of the fuel system. For example, the oil seal oil cannot be transported to the combustion chamber. At this time, even if the oil seal oil supply system pumps the oil seal oil to the starter, only the fuel regulation accessory of the starter can be oil sealed, and the entire fuel system cannot be oil sealed; when the fuel supply switch is closed, the fuel outlet of the fuel regulation accessory of the starter is opened, and the oil seal oil can smoothly enter the subsequent oil circuit of the fuel system. At this time, the entire fuel system of the starter can be oil sealed. When the oil pump switch is opened, the power supply branch where the electric booster pump of the oil seal oil supply system is located is disconnected, and the electric booster pump does not work; when the oil pump switch is closed, the power supply branch where the electric booster pump of the oil seal oil supply system is located is connected, and the electric booster pump works normally.

[0032] It can be understood that when the start-stop switch and the oil pump switch are closed and the motor switch and the fuel supply switch are opened, the power supply branches of the starter motor, the parking solenoid valve, and the status reset solenoid valve are all opened, and the starter motor does not work, so that the fuel booster pump and the lubricating oil booster pump in the starter do not work, and the oil seal operation of the starter lubricating oil system cannot be realized. In addition, the fuel outlet of the fuel metering and control accessory and the baffle valve of the starter fuel system are both closed, and the fuel system oil circuit of the starter is not opened. Only the electric booster pump of the oil seal oil supply system provides oil seal oil to the fuel metering and control accessory of the starter, and only the fuel metering and control accessory of the starter is oil-sealed, so as to realize the static seal of the starter. Among them, the static seal of the starter is applicable to the oil seal operation scenario when the starter fails. For example, when the rotor of the starter fails, only the fuel metering and control accessory of the starter is oil-sealed, and the rotor part is not oil-sealed.

[0033] When the start-stop switch, the motor switch, the fuel supply switch, and the oil pump switch are closed at the same time, the starter motor works and drives the fuel booster pump and the lubricating oil booster pump in the starter to run. At this time, the fuel outlet of the fuel metering and control accessory and the baffle valve of the starter fuel system are both opened, the fuel passage of the starter is opened, and the electric booster pump of the oil seal oil supply system and the fuel booster pump in the starter pump oil seal oil to the fuel system of the starter together to oil-seal the entire fuel system of the starter. At the same time, the lubricating oil booster pump in the starter pumps lubricating oil to the lubricating oil system of the starter to oil-seal the lubricating oil system of the starter, so as to realize the dynamic oil seal of the starter. Among them, the dynamic oil seal of the starter is applicable to the normal oil seal operation scenario of the starter, and the fuel system and the lubricating oil system of the starter are oil-sealed and stored at the same time.

[0034] When the start-stop switch and the motor switch are closed and the fuel supply switch and the oil pump switch are opened, the power supply branch where the starter motor is located is connected, and the power supply branches of the parking solenoid valve, the status reset solenoid valve, and the electric booster pump are all opened. The starter motor works and drives the fuel booster pump and the lubricating oil booster pump in the starter to run. The electric booster pump of the oil seal oil supply system does not work, and the parking solenoid valve and the status reset solenoid valve are not connected. As a result, the fuel outlet of the fuel metering and control accessory and the baffle valve of the starter fuel system are both closed, and the entire fuel system of the starter is closed. At this time, only the lubricating oil booster pump in the starter pumps lubricating oil from the lubricating oil supply system for pumping, and only the lubricating oil system of the starter is oil-sealed, so as to realize the cold operation of the starter.

[0035] It can be understood that after the oil seal operation is completed, just press the start-stop switch again. And when an emergency occurs during the oil seal process, the start-stop switch can also be pressed again to realize the starter can stop at any time.

[0036] It can be understood that by designing the motor switch, the fuel supply switch, and the oil pump switch, the present invention can achieve separate control of the starter motor circuit, the starter solenoid valve circuit, and the electric supercharger pump circuit. Thus, the starter oil seal mode can be freely switched between the static oil seal mode, the dynamic oil seal mode, and the cold operation mode, meeting the oil seal operation requirements in various scenarios and greatly enhancing the versatility of the oil seal equipment.

[0037] It can be understood that the power supply specifically includes a charging power supply, a battery, and a second relay. The charging power supply is used to convert alternating current into direct current, the battery is used to directly provide direct current, the charging power supply and the battery adopt a parallel power supply method, and the second relay is used to control the on / off of the battery charging circuit. The second relay forms a series circuit with the start-stop switch and the charging power supply. When the start-stop switch is closed, the second relay is energized and controls the closure of the battery charging circuit to achieve charging of the battery by the charging power supply. By adopting the method of jointly supplying power by the charging power supply and the battery, the demand for continuously supplying a large amount of electrical energy to the starter can be met. Moreover, after the start-stop switch is closed, the battery can be automatically charged through the second relay. Among them, the charging power supply specifically includes a transformer and a rectifier. After the transformer is connected to a 220V AC power supply, it is step-down processed and converted into 27V direct current through the rectifier. The battery selects a 27V / 300F capacitor battery with a relatively fast charge and discharge speed to ensure the demand for continuous power supply. In addition, the output power of the starter motor reaches 2kW, the starting instantaneous current is between 800A and 900A, the steady-state current is about 300A, and the charging current of the battery is also relatively large. Therefore, both the first relay and the second relay adopt electromagnetic current relays that can withstand 1000A current. In addition, a 300A fuse is also provided on the power supply branch where the starter motor is located to protect the starter motor.

[0038] Preferably, the power supply and control system further includes a time relay. The starter motor, the parking solenoid valve, and the status reset solenoid valve are connected in parallel and then connected in series with the time relay. The time relay is used to control the power supply branch of the starter motor, the parking solenoid valve, and the status reset solenoid valve to be disconnected with a time delay, thereby realizing the automatic stop of the oil seal operation. For example, when performing dynamic oil seal of the starter, according to the starter oil seal procedure, after the start-stop switch, the motor switch, the fuel supply switch, and the oil pump switch are turned on, the starter operates and blows out the oil seal oil. The time relay disconnects after a 10s delay after the switch is turned on, and the power supply branches of the motor and the solenoid valve are disconnected, and the oil seal ends. Among them, the time relay adopts a pneumatic relay with a time delay for disconnection, and the specific time delay for disconnection can be set according to the actual oil seal requirements.

[0039] In addition, the power supply and control system further includes an electric supercharger pump speed governor, which is used to control the speed of the electric supercharger pump, thereby adjusting the pre-pressure of the oil seal oil.

[0040] In addition, the oil seal device further includes an oil residue collection system for collecting the residual oil discharged during the oil sealing process of the starter. Among them, the oil residue collection system includes an exhaust gas guiding device, a guiding pipe, and an oil residue collection container. The exhaust gas guiding device is installed at the exhaust port of the starter and is used to guide the oil seal oil blown out from the exhaust port to a proper direction, preventing the oil seal oil from scattering everywhere and facilitating cleaning. The guiding pipe is respectively connected to the fuel vent nozzle, the fuel return nozzle, the lubricating oil return nozzle of the starter, the oil discharge port of the exhaust gas guiding device, and the oil residue collection container. Among them, the exhaust gas guiding device uses the flange of the exhaust outlet of the starter as a support and fixing platform. The interface of the exhaust gas guiding device is attached to the flange of the exhaust port and placed on the flange platform, and then the fixing claws on the exhaust gas guiding device are used to grasp the flange to achieve fixation.

[0041] It can be understood that the inventor of the present invention has completed the actual production of the oil seal device, and selected 10 starters removed from the ground for internal dynamic oil sealing treatment. During the oil sealing process, the internal oil pressure, various relevant control signals, and operating data are all normal, the oil inlet and return system can work normally, and the exhaust gas guiding device can effectively prevent the diffusion of oil fluid, successfully realizing the oil sealing and storage of the internal fuel and lubricating oil system of the starter without relying on external resources on the ground.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An oil seal device for a gas turbine starter, characterized in that, Including: A power supply and control system, which is used to provide a stable power supply for the starter and control the switching of the starter oil seal mode among the static oil seal mode, dynamic oil seal mode and cold operation mode; An oil seal oil supply system, which is used to supply oil seal oil for the fuel system of the starter in the static oil seal mode or dynamic oil seal mode; A lubricating oil supply system, which is used to supply lubricating oil for the lubricating oil system of the starter in the dynamic oil seal mode or cold operation mode; The power supply and control system includes a power supply, a start-stop switch, a first relay, a motor switch, a fuel supply switch and an oil pump switch. The power supply is used to provide a stable DC power supply for the electric booster pump of the oil seal oil supply system, the starter motor, the parking solenoid valve and the status reset solenoid valve installed on the starter. Among them, the electric booster pump, the starter motor, the parking solenoid valve and the status reset solenoid valve are connected in parallel and then in series with the start-stop switch. The start-stop switch is used to control the start and stop of the whole system. The first relay is used to control the on-off of the power supply branch where the starter motor is located. The motor switch is arranged on the power supply branch where the first relay is located and is used to control the start and stop of the starter motor. The parking solenoid valve and the status reset solenoid valve are connected in parallel and then in series with the fuel supply switch. The fuel supply switch is used to control the opening or closing of the fuel outlet of the fuel metering accessory of the starter. The oil pump switch is arranged on the power supply branch where the electric booster pump is located.

2. The oil seal device of a gas turbine starter according to claim 1, characterized in that, When the start-stop switch and the oil pump switch are closed and the motor switch and the fuel supply switch are opened, the starter motor does not work, the fuel outlet of the fuel metering accessory and the baffle valve of the starter fuel system are both closed, and only the electric booster pump of the oil seal oil supply system supplies oil seal oil to the fuel metering accessory of the starter, and only the fuel metering accessory of the starter is oil sealed, so as to realize the static seal of the starter.

3. The oil seal device of a gas turbine starter according to claim 1, characterized in that, When the start-stop switch, the motor switch, the fuel supply switch and the oil pump switch are closed at the same time, the starter motor works and drives the fuel booster pump and the lubricating oil booster pump in the starter to operate. The fuel outlet of the fuel metering accessory and the baffle valve of the starter fuel system are both opened. The electric booster pump of the oil seal oil supply system and the fuel booster pump in the starter supply oil seal oil to the fuel system of the starter together to oil seal the whole fuel system of the starter. At the same time, the lubricating oil booster pump in the starter pumps lubricating oil to the lubricating oil system of the starter to oil seal the lubricating oil system of the starter, so as to realize the dynamic oil seal of the starter.

4. The oil seal device of a gas turbine starter according to claim 1, characterized in that, When the start-stop switch and the motor switch are closed and the fuel supply switch and the oil pump switch are opened, the starter motor works and drives the fuel booster pump and the lubricating oil booster pump in the starter to operate. The electric booster pump of the oil seal oil supply system does not work. The fuel outlet of the fuel metering accessory and the baffle valve of the starter fuel system are both closed. Only the lubricating oil booster pump in the starter pumps the lubricating oil extracted from the lubricating oil supply system, and only the lubricating oil system of the starter is oil sealed, so as to realize the cold operation of the starter.

5. The oil seal device of a gas turbine starter according to claim 1, characterized in that, It also includes a time relay. The starter motor, the parking solenoid valve and the status reset solenoid valve are connected in parallel and then in series with the time relay. The time relay is used to control the delayed disconnection of the power supply branches of the starter motor, the parking solenoid valve and the status reset solenoid valve.

6. The oil seal device of the gas turbine starter according to claim 1, characterized in that, The power supply includes a charging power supply, a battery, and a second relay. The charging power supply is used to convert alternating current into direct current, the battery is used to directly provide direct current, the charging power supply and the battery are in a parallel power supply mode, the second relay is used to control the on / off of the battery charging circuit, and the second relay forms a series circuit with the start-stop switch and the charging power supply. When the start-stop switch is closed, the second relay is energized and controls the closure of the battery charging circuit to realize charging of the battery by the charging power supply.

7. The oil seal device of a gas turbine starter according to claim 1, characterized in that, It further includes an oil residue collection system for collecting the oil residue discharged during the oil sealing process of the starter.

8. The oil seal device of the gas turbine starter according to claim 7, characterized in that, The oil residue collection system includes an exhaust guiding device, a guiding pipe, and an oil residue collection container. The exhaust guiding device is installed at the exhaust port of the starter and is used to guide the oil for oil sealing blown out from the exhaust port to a proper direction. The guiding pipe is respectively connected to the fuel gas release nozzle, the fuel return nozzle, the lubricating oil return nozzle of the starter, the oil discharge port of the exhaust guiding device, and the oil residue collection container.

9. The oil seal device of a gas turbine starter as claimed in claim 6, characterized in that, Both the first relay and the second relay adopt electromagnetic current relays that can withstand a current of 1000A.

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