Lubricating oil system with self-adaptive throttling ventilation function

Abstract

The invention provides a self-adaptive throttling and ventilating lubricating oil system, which belongs to the field of aero-engines and comprises a first bearing cavity, a second bearing cavity, a third bearing cavity, a lubricating oil tank, a lubricating oil pump, a ventilator and an electric valve, each bearing cavity is connected with the ventilator and the lubricating oil tank through a ventilation pipeline, each bearing cavity is connected to the lubricating oil pump through an oil return pipeline, the lubricating oil pump supplies oil to each bearing cavity through an oil supply pipeline, and the lubricating oil pump is connected with the lubricating oil tank through the oil return pipeline and an oil suction pipeline; wherein the second bearing cavity and the third bearing cavity are communicated through the ventilation pipeline to realize common throttling ventilation, the electric valve is arranged on the ventilation pipeline for common throttling ventilation, and the electric valve is connected with the sealing bleed air of the second bearing cavity and / or the third bearing cavity and is used for sensing and measuring the pressure of the bearing cavity and the corresponding sealing bleed air pressure so as to obtain the sealing pressure difference; when the sealing pressure difference exceeds the threshold value range, the electric valve changes the internal throttling diameter according to actuation, then the throttling equivalent diameter of the ventilation pipeline is adjusted, and finally the pressure of the bearing cavity is dynamically adjusted.

Description

Technical Field

[0001] This application belongs to the field of aeroengines, and particularly relates to an oil system with adaptive throttling ventilation. Background Art

[0002] The ventilation system is one of the oil subsystems of aeroengines and gas turbines. Its main function is to separate the sealing gas entering the bearing cavity, the oil vapor in the bearing cavity, etc. After oil-gas separation, the oil enters the oil return system, and the gas is discharged outside the engine to ensure the sealing pressure difference in the bearing cavity and prevent oil leakage. Mainly

[0003] The ventilation systems in the prior art are generally divided into three forms: free ventilation, throttling ventilation, and shaft center ventilation. There is no throttle orifice plate on the pipeline of the free ventilation system; there are generally two ways to realize the bearing cavity pressure regulation in the throttling ventilation system: set a throttle orifice plate in the ventilation pipeline or set a ventilation valve controlled by a spring. Among them, the throttle orifice set on the throttle orifice plate directly affects the gas flow area in the bearing cavity; the spring-controlled ventilation valve controls the valve actuation by sensing the bleed air pressure to adjust the length of the spring, changing the gas flow area in the bearing cavity. When the gas flow area increases, the bearing cavity pressure decreases, the sealing pressure difference increases, and the ventilation volume of the oil system increases; conversely, when the gas flow area decreases, the bearing cavity pressure increases, the sealing pressure difference decreases, and the ventilation volume of the oil system decreases. In the throttling ventilation system using a throttle orifice plate, by machining a set of orifice plates with different diameters and selecting a certain diameter orifice plate for assembly according to the calculation results, the diameter of the throttle orifice cannot be changed during the operation of the engine. When the engine state changes, such as suddenly dropping from a high state to a low state, the pressure in the bearing cavity changes slowly, resulting in the short-term bearing cavity pressure being greater than the sealing pressure, causing oil leakage; or in the low state, the sealing gas pressure is too low, resulting in insufficient sealing and oil leakage. When the throttle orifice plate needs to be replaced, the engine needs to be in a stopped state, and manual replacement of the throttle orifice plate is required, which requires additional manpower and time costs. For the throttling ventilation system using a spring-controlled ventilation valve, affected by factors such as machining and assembly, problems such as valve jamming are very likely to occur. Summary of the Invention

[0004] The purpose of this application is to provide an oil system with adaptive throttling ventilation to solve or mitigate at least one problem in the background art.

[0005] The technical solution of this application is: an oil system with adaptive throttling ventilation, including: a first bearing cavity, a second bearing cavity, a third bearing cavity, an oil tank, an oil pump, a ventilator, and an electric valve;

[0006] The tops of the first bearing cavity to the third bearing cavity are respectively connected to the tops of the ventilator and the lubricating oil tank through ventilation pipelines. The bottoms of the first bearing cavity to the third bearing cavity are connected to the lubricating oil pump through return oil pipelines. The lubricating oil pump supplies oil to the tops of the first bearing cavity to the third bearing cavity through an oil supply pipeline, and the lubricating oil pump is connected to the lubricating oil tank through a return oil pipeline and a suction oil pipeline;

[0007] Among them, the second bearing cavity and the third bearing cavity are connected through a ventilation pipeline to achieve common throttling ventilation. The electric valve is arranged on the ventilation pipeline for common throttling ventilation, and the electric valve is connected to the sealing air extraction of the second bearing cavity and / or the third bearing cavity, and is used to sense and measure the pressure of the second bearing cavity and / or the third bearing cavity and the corresponding sealing air extraction pressure;

[0008] According to the sealing pressure difference obtained from the pressure of the second bearing cavity and / or the third bearing cavity and the corresponding sealing air extraction pressure, when the sealing pressure difference exceeds the threshold range, the electric valve actuates to change the internal throttling diameter, thereby adjusting the throttling equivalent diameter of the ventilation pipeline, and finally realizing the dynamic adjustment of the bearing cavity pressure to ensure that the sealing pressure difference remains stable within the given range.

[0009] Preferably, a radiator and a lubricating oil filter are connected to the oil supply pipelines connecting the lubricating oil pump to the first bearing cavity to the third bearing cavity, and are used for cooling the lubricating oil on the oil supply pipelines and filtering impurities.

[0010] Preferably, the electric valve includes a pressure sensing module, a data processing and control module, a motor drive module and a valve actuator. The pressure sensing module is used to sense the pressure of the second bearing cavity and / or the third bearing cavity and the corresponding sealing air extraction pressure. The data processing and control module calculates the sealing pressure difference based on the pressure of the second bearing cavity and / or the third bearing cavity and the corresponding sealing air extraction pressure. The motor drive module is used to control the valve actuator 194 to execute actions according to the instructions of the data processing and control module, so as to change the throttling equivalent diameter of the ventilation pipeline.

[0011] Preferably, the threshold range of the sealing pressure difference is 20 kPa to 50 kPa.

[0012] Preferably, the electric valve is connected to the sealing air extraction with the lowest pressure among the sealing air extractions, and the sealing pressure difference is obtained by calculating the lowest sealing air extraction and the corresponding bearing cavity pressure.

[0013] Preferably, when the sealing pressure difference is greater than the threshold range of the sealing pressure difference, the electric valve reduces the throttling aperture of the ventilation pipeline to reduce the sealing pressure difference; when the sealing pressure difference is less than the threshold range of the sealing pressure difference, the electric valve increases the throttling aperture of the ventilation pipeline to reduce the bearing cavity pressure and increase the sealing pressure difference.

[0014] In the lubricating oil system with adaptive throttle ventilation of the present application, the throttle orifice diameter is adjusted in real time by the electric valve 19 according to the seal differential pressure, the bearing chamber pressure is changed, so as to ensure that the seal differential pressure is always stably maintained within a given range and does not change with the engine state, avoiding the risk of lubricating oil leakage caused by insufficient seal differential pressure in some states, and without the need to increase additional labor, time and other costs, improving the engine utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions provided by the present application, the drawings will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application.

[0016] Figure 1 It is a schematic diagram of the lubricating oil system with adaptive throttle ventilation of the present application.

[0017] Figure 2 It is a schematic diagram of the electric valve of the present application.

[0018] Reference Signs:

[0019] First bearing chamber 11

[0020] Second bearing chamber 12

[0021] Third bearing chamber 13

[0022] Lubricating oil tank 14

[0023] Lubricating oil pump 15

[0024] Ventilator 16

[0025] Lubricating oil filter 17

[0026] Radiator 18

[0027] Electric valve 19 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the purpose, technical solutions and advantages of the implementation of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

[0029] In order to overcome the problems existing in the throttle ventilation system with orifice plate or the throttle ventilation system controlled by spring in the prior art, the present application provides a lubricating oil system with adaptive throttle ventilation.

[0030] As Figure 1 shown, the lubricating oil system with adaptive throttle ventilation provided by the present application includes: the first bearing chamber 11 to the third bearing chamber 13, the lubricating oil tank 14, the lubricating oil pump 15, the ventilator 16, the lubricating oil filter 17, the radiator 18, and the electric valve 19.

[0031] The tops of the first bearing cavity 11, the second bearing cavity 12 and the third bearing cavity 13 are connected to the top of the lubricating oil tank 14 at one end through a ventilation pipeline and to the ventilator 16 at the other end. The bottoms of the first bearing cavity 11, the second bearing cavity 12 and the third bearing cavity 13 are connected to the lubricating oil pump 15 through an oil return pipeline. At the same time, the lubricating oil pump 15 is respectively connected to the tops of the first bearing cavity 11, the second bearing cavity 12 and the third bearing cavity 13 through an oil supply pipeline for supplying oil to the three bearing cavities. Among them, a radiator 18 and a lubricating oil filter 17 are connected to the oil supply pipelines connecting the lubricating oil pump 15 to the first bearing cavity 11, the second bearing cavity 12 and the third bearing cavity 13 for cooling the lubricating oil on the oil supply pipelines and filtering impurities. The lubricating oil pump 15 is connected to the lubricating oil tank 14 through an oil return pipeline and a suction pipeline for transporting the remaining or residual lubricating oil back to the lubricating oil tank 14.

[0032] Among them, the second bearing cavity 12 and the third bearing cavity 13 are connected through a ventilation pipeline to achieve common throttling ventilation. An electric valve 19 is arranged on the ventilation pipeline for common throttling ventilation, and the electric valve 19 is connected to the sealing air extraction at the front and rear sides of the second bearing cavity 12 and / or the third bearing cavity 13 for sensing and measuring the pressure of the second bearing cavity 12 and / or the third bearing cavity 13 and its sealing air extraction.

[0033] An adaptive throttling ventilation system is constituted by the solenoid valve 19, the ventilator 16 and the ventilation pipeline. During the operation of the engine, the pressure of the sealing air extraction and the pressure of the bearing cavity change with the operating state of the engine, ultimately resulting in the change of the sealing pressure difference of the bearing cavity. The electric valve 19 senses and measures the pressure of the bearing cavity and the pressure of the sealing air extraction and calculates the sealing pressure difference. When the sealing pressure difference exceeds the set threshold range, the electric valve 19 actuates according to it, changes the throttling diameter inside it, and then adjusts the throttling equivalent diameter of the ventilation pipeline, ultimately realizing the dynamic adjustment of the bearing cavity pressure and ensuring that the sealing pressure difference remains stable within the given range.

[0034] Such as Figure 2The figure shows a schematic diagram of the electric valve in this application. The electric valve 19 has a pressure sensing module 191, a data processing and control module 192, a motor drive module 193, and a valve actuator 194. The pressure sensing module 191 is used to sense the pressure in the second bearing cavity 12 and / or the third bearing cavity 13 (the second bearing cavity 12 and the third bearing cavity 13 are connected through a ventilation pipeline and have the same pressure), as well as the sealing bleed air pressure in the second bearing cavity 12 and / or the third bearing cavity 13. The pressure sensing module 191 sends the above-mentioned bearing cavity pressure and the corresponding sealing bleed air pressure to the data processing and control module 192. The data processing and control module 192 calculates the sealing pressure difference based on the bearing cavity pressure and the corresponding sealing bleed air pressure. When the sealing pressure difference is less than or greater than the threshold range, the data processing and control module 192 controls the motor drive module 193 to send a control instruction to the valve actuator 194, and the valve actuator 194 finally changes the throttle diameter, realizing the control of the equivalent throttle diameter of the ventilation pipeline.

[0035] In some embodiments of this application, the threshold range of the sealing pressure difference is 20 kPa to 50 kPa. It should be noted that the threshold range of the sealing pressure difference can be adjusted according to different aero-engines.

[0036] In the preferred embodiment of this application, the electric valve 19 only needs to be connected to the path with the lowest sealing bleed air pressure in the second bearing cavity 12 and the third bearing cavity 13. For example, in the illustrated embodiment, A to D are the front and rear sealing bleed air pressure points of the second bearing cavity 12 and the third bearing cavity 13. Due to reasons such as the pressure loss along the sealing bleed air, the sealing bleed air pressure point D at the last side is usually the sealing bleed air pressure point with the lowest sealing bleed air pressure. By the pressure sensing module 191 of the electric valve 19 sensing the pressure at the sealing bleed air pressure point D and the pressure in the third bearing cavity 13, the sealing pressure difference at this place can be obtained. When the sealing pressure difference exceeds the threshold range, the data processing and control module 192 issues a driving instruction to the motor drive module 193. According to the instruction, the motor drive module 193 drives the valve actuator 194 to quickly act to the specified position, adjusting the equivalent diameter of the throttle hole in the ventilation pipeline. According to the bearing cavity pressure and the corresponding sealing bleed air pressure in the throttle aperture state, the data processing and control module 192 issues a driving instruction again according to the sealing pressure difference result until the sealing pressure difference meets the given requirements.

[0037] Among them, when the sealing pressure difference is greater than the threshold range, in order to reduce the lubricating oil consumption, the electric valve 19 reduces the throttle aperture of the ventilation pipeline to reduce the sealing pressure difference; when the sealing pressure difference is less than the threshold range, in order to prevent lubricating oil leakage, the electric valve 19 increases the throttle aperture of the ventilation pipeline to reduce the bearing cavity pressure and increase the sealing pressure difference.

[0038] In the lubricating oil system with adaptive throttling ventilation of the present application, the throttle hole diameter is adjusted in real time by the electric valve 19 according to the seal differential pressure, the bearing chamber pressure is changed, so as to ensure that the seal differential pressure is always stably maintained within a given range and does not change with the engine state, avoiding the risk of lubricating oil leakage caused by insufficient seal differential pressure under certain conditions, and without the need to increase additional costs such as labor and time, improving the engine utilization rate.

[0039] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. An adaptive throttling ventilation lubricating oil system, characterized in that, Comprising: A first bearing cavity, a second bearing cavity, a third bearing cavity, an oil sump, an oil pump, a ventilator and an electric valve; The tops of the first to third bearing cavities are respectively connected to the top of the ventilator and the oil sump through a ventilation pipeline, the bottoms of the first to third bearing cavities are connected to the oil pump through an oil return pipeline, the oil pump supplies oil to the tops of the first to third bearing cavities through an oil supply pipeline, and the oil pump is connected to the oil sump through an oil return pipeline and an oil suction pipeline; Wherein, the second bearing cavity and the third bearing cavity are communicated through a ventilation pipeline to achieve common throttling ventilation, the electric valve is arranged on the ventilation pipeline for common throttling ventilation, and the electric valve is connected to the sealing air extraction of the second bearing cavity and / or the third bearing cavity for sensing and measuring the pressure of the second bearing cavity and / or the third bearing cavity and the corresponding sealing air extraction pressure; According to the sealing pressure difference obtained from the pressure of the second bearing cavity and / or the third bearing cavity and the corresponding sealing air extraction pressure, when the sealing pressure difference exceeds the threshold range, the electric valve actuates to change the internal throttling diameter, thereby adjusting the throttling equivalent diameter of the ventilation pipeline, and finally realizing the dynamic adjustment of the bearing cavity pressure to ensure that the sealing pressure difference remains stable within the given range.

2. The lubricating oil system with adaptive throttle ventilation according to claim 1, characterized in that A radiator and an oil filter are connected to the oil supply pipeline connecting the oil pump to the first to third bearing cavities for cooling the oil on the oil supply pipeline and filtering impurities.

3. The lubricating oil system with adaptive throttling ventilation according to claim 1, characterized in that, The electric valve includes a pressure sensing module, a data processing and control module, a motor drive module and a valve actuator. The pressure sensing module is used to sense the pressure of the second bearing cavity and / or the third bearing cavity and the corresponding sealing air extraction pressure. The data processing and control module calculates the sealing pressure difference according to the pressure of the second bearing cavity and / or the third bearing cavity and the corresponding sealing air extraction pressure. The motor drive module is used to control the valve actuator 194 to execute actions according to the instructions of the data processing and control module, thereby changing the throttling equivalent diameter of the ventilation pipeline.

4. The lubricating oil system with adaptive throttle ventilation according to claim 3, characterized in that, The threshold range of the sealing pressure difference is 20 kPa to 50 kPa.

5. The lubricating oil system with adaptive throttle ventilation according to claim 3, characterized in that The electric valve is connected to the sealing air extraction with the lowest pressure in the sealing air extraction, and the sealing pressure difference is obtained by calculating the lowest sealing air extraction and the corresponding bearing cavity pressure.

6. The lubricating oil system with adaptive throttle ventilation according to any one of claims 1 to 5, characterized in that When the sealing pressure difference is greater than the threshold range of the sealing pressure difference, the electric valve reduces the throttling aperture of the ventilation pipeline to reduce the sealing pressure difference; when the sealing pressure difference is less than the threshold range of the sealing pressure difference, the electric valve increases the throttling aperture of the ventilation pipeline to reduce the bearing cavity pressure and increase the sealing pressure difference.

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