Lubricating oil pressure high pressure automatic regulation system and method applicable to aircraft engines

Abstract

The present invention discloses a lubricating oil pressure high pressure automatic regulating system and method applicable to aircraft engines, which realizes lubricating oil supercharging by cooling the lubricating oil, and forms a cooling water circulation system through a post-cooling temperature control device and a circulating water system, and the cooling water and lubricating oil return oil are heat exchanged in a pre-heat exchange device, thereby realizing cooling and cooling of the lubricating oil return oil, so as to increase the viscosity of the lubricating oil, and thus improve the lubricating oil pressure. In addition, the post-cooling temperature control device can convert the lubricating oil target temperature according to the real-time engine speed, and automatically adjust its own working state according to the difference between the lubricating oil actual temperature after heat exchange cooling and the lubricating oil supply actual temperature and the lubricating oil target temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature, realizing accurate control of the lubricating oil temperature, having the function of regulating the high pressure boundary of the lubricating oil pressure, and realizing automatic adjustment of the lubricating oil pressure in response to the engine state, and having the advantages of good practicality and high control accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oil high pressure regulation, and in particular, to a lubricating oil high pressure automatic regulation system suitable for aircraft engines, and also to a lubricating oil high pressure automatic regulation method using the lubricating oil high pressure automatic regulation system. Background Art

[0002] According to the endurance test requirements in the "Aircraft Engine Airworthiness Regulations", civil aviation engines need to undergo oil pressure boundary condition assessments to verify the engine's operating capability, reliability, and safety under oil pressure limit conditions. For the high-pressure limit assessment of the oil system, the engine needs to undergo a phase of endurance testing at the maximum oil limit pressure. The oil pressure must not be lower than the engine's maximum oil pressure. The engine state is required to reach the three red line state, that is, the engine simultaneously reaches the maximum physical speed, gas temperature, thrust, or torque value of the output shaft. The assessment conditions are harsh, so the ability to adjust the oil pressure high pressure boundary is required. Figure 1 As shown, the lubricating oil system of the current aircraft engine extracts lubricating oil from the engine lubricating oil tank 100 through the lubricating oil booster pump 400, and enters the fuel lubricating oil radiator 500 through the corresponding pipeline. In the radiator, the lubricating oil and the fuel are heat-exchanged, the lubricating oil temperature is reduced, and the fuel is heated. The lubricating oil supply temperature and pressure can be measured through the oil supply temperature / pressure combined measuring point 300. After that, the lubricating oil reaches each lubrication point of the engine through the pipeline to lubricate the corresponding bearings, splines and other parts, and then the lubricating oil is pumped back by the return oil pump 600 through the return oil pipeline to the engine lubricating oil tank 100, thus forming a working cycle of the entire lubricating oil system of the engine. In addition, some engines are also equipped with a return oil cooling device 700 on the return oil line to further cool the lubricating oil to prevent the lubricating oil temperature from being too high and affecting the normal operation of the engine. The lubricating oil pump realizes oil supply and oil return with the engine transmission operation. The higher the engine working speed, the higher the speed of the lubricating oil pump, the higher the lubricating oil supply pressure, and the stronger the oil return capacity. Therefore, the lubricating oil pressure of the existing lubricating oil system is regulated by the engine speed, and the lubricating oil pump itself does not have additional lubricating oil pressure regulation capabilities. In addition, as the requirements for engine integration become higher and higher, the engine lubricating oil system pipelines, except for the main oil supply and return oil lines, are basically built-in oil lines, and the methods for regulating the lubricating oil pressure are limited.

[0003] At present, foreign engine manufacturers generally directly adjust the lubricating oil pressure by adding an additional lubricating oil pressure regulating device to the oil supply line of the lubricating oil system, which can realize automatic adjustment of the high pressure boundary of the lubricating oil pressure, but it cannot respond to changes in engine status and has problems of poor applicability and poor control accuracy. In addition, due to the large size and weight of the additional lubricating oil pressure regulating device, the structural space layout of the engine changes, which has a great impact on the engine configuration. Summary of the invention

[0004] The present invention provides a lubricating oil pressure high-pressure automatic regulation system and method suitable for aircraft engines, which realizes the lubricating oil pressure high-pressure boundary regulation function and realizes automatic regulation of the lubricating oil pressure in response to the engine state, has the advantages of good practicability and high control accuracy, and has minimal impact on the engine configuration.

[0005] According to one aspect of the present invention, there is provided a high-pressure automatic regulating system for lubricating oil pressure of an aircraft engine, comprising a front heat exchange device, a rear cooling temperature control device and a circulating water system, wherein the front heat exchange device is respectively connected to the oil return line of the lubrication system, the engine lubricating oil tank and the rear cooling temperature control device, and the rear cooling temperature control device is also connected to the circulating water system, the circulating water system provides normal temperature water which is cooled to cooling water by the rear cooling temperature control device, the cooling water and the return oil of the lubricating system are heat exchanged in the front heat exchange device, the lubricating oil after heat exchange cooling enters the engine lubricating oil tank, and the water after heat exchange heating passes through the The rear cooling temperature control device flows back to the circulating water system, and a first temperature sensor is arranged at the lubricating oil outlet of the front heat exchange device for measuring the lubricating oil temperature after heat exchange cooling. The rear cooling temperature control device is respectively electrically connected to the first temperature sensor, the engine speed sensor and the oil supply temperature / pressure combination measuring point on the main oil supply line of the lubrication system, for converting the lubricating oil target temperature according to the real-time speed of the engine, and automatically adjusting its own working state according to the difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the actual measured temperature of the lubricating oil supply and the lubricating oil target temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature.

[0006] Furthermore, the post-cooling temperature control device includes a control system, a heat dissipation unit, a first flow regulating device and a second flow regulating device. The heat dissipation unit is respectively connected to the front heat exchange device and the circulating water system, and is used to cool the circulating water system into cooling water and provide it to the front heat exchange device, and is also used to provide the water after heat exchange in the front heat exchange device to the circulating water system. The first flow regulating device is arranged on the pipeline connecting the heat dissipation unit and the circulating water system, and is used to adjust the flow rate of normal temperature water provided by the circulating water system. The second flow regulating device is respectively connected to the normal temperature water inlet and the cooling water outlet of the heat dissipation unit, and is used to adjust the flow rate of the water mixed with the cooling water. The control system is electrically connected to the heat dissipation unit, the first flow regulating device, the second flow regulating device, the first temperature sensor, the engine speed sensor and the oil supply temperature / pressure combination measuring point on the main oil supply line, respectively, and is used to obtain the lubricating oil target temperature according to the real-time engine speed, and according to the first temperature difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the lubricating oil target temperature, and the second temperature difference between the actual measured lubricating oil supply temperature and the lubricating oil target temperature, a staged control strategy is adopted to control the working state of at least one of the heat dissipation unit, the first flow regulating device and the second flow regulating device, so that the lubricating oil supply temperature is automatically adjusted to the target temperature.

[0007] Furthermore, in the initial stage, the first temperature difference is used as the adjustment control judgment condition to achieve coarse adjustment of the lubricating oil supply temperature; in the subsequent stage, the second temperature difference is used as the adjustment control judgment condition to achieve fine adjustment of the lubricating oil supply temperature.

[0008] Furthermore, when the first temperature difference is greater than a first preset threshold, the control system controls the first flow regulating device and the heat dissipation unit to operate at a maximum flow and a maximum power respectively, so as to achieve rapid cooling of the lubricating oil.

[0009] Furthermore, when the first temperature difference is not greater than the first preset threshold, and the second temperature difference is greater than or equal to the third preset threshold and less than or equal to the second preset threshold, the control system also determines the change trend of the actual measured temperature of the lubricating oil supply. If the actual measured temperature of the lubricating oil supply shows a downward trend, the control system controls the normal temperature water flow rate output by the first flow regulating device to gradually decrease as the second temperature difference decreases until the actual measured temperature of the lubricating oil supply approaches the target temperature. If the actual measured temperature of the lubricating oil supply shows an upward trend, the control system controls the first flow regulating device to operate at a maximum regulated flow rate until the actual measured temperature of the lubricating oil supply approaches the target temperature, wherein the second preset threshold is less than the first preset threshold.

[0010] Furthermore, when the second temperature difference is greater than or equal to zero and less than a third preset threshold value, the control system also determines the change trend of the actual measured temperature of the lubricating oil supply. If the actual measured temperature of the lubricating oil supply shows a downward trend, the control system controls the power of the cooling unit to gradually decrease as the second temperature difference decreases until the actual measured temperature of the lubricating oil supply reaches the target temperature. If the actual measured temperature of the lubricating oil supply shows an upward trend, the control system controls the cooling unit to operate at maximum power until the actual measured temperature of the lubricating oil supply reaches the target temperature.

[0011] Furthermore, when the second temperature difference is greater than or equal to a fourth preset threshold value and less than zero, the control system also determines the changing trend of the actually measured temperature of the lubricating oil supply. If the actually measured temperature of the lubricating oil supply shows a downward trend, the control system controls the mixed normal temperature water flow rate output by the second flow regulating device to gradually decrease as the second temperature difference increases until the actually measured temperature of the lubricating oil supply reaches the target temperature. If the actually measured temperature of the lubricating oil supply shows an upward trend, the control system controls the mixed normal temperature water flow rate output by the second flow regulating device to be zero until the actually measured temperature of the lubricating oil supply reaches the target temperature, wherein the fourth preset threshold value is less than the third preset threshold value.

[0012] Furthermore, it also includes an automatic safety control device electrically connected to the control system, and the automatic safety control device is respectively connected to the pipeline connecting the front heat exchange device and the return oil circuit of the engine lubrication system, and the pipeline connecting the front heat exchange device and the engine lubricating oil tank. The control system is also used to control the automatic safety control device to block the pipeline connecting the front heat exchange device and the engine lubricating oil tank and discharge the engine lubricating oil return when the engine speed is lower than a preset speed threshold.

[0013] In addition, the present invention also provides a method for automatically regulating the high pressure of lubricating oil pressure applicable to an aircraft engine, which uses the above-mentioned automatic regulating system for the high pressure of lubricating oil pressure applicable to an aircraft engine, and includes the following contents:

[0014] Collect the real-time engine speed, the actual temperature of the lubricating oil after heat exchange cooling, and the actual temperature of the lubricating oil supply;

[0015] The lubricating oil target temperature is obtained by converting the real-time engine speed;

[0016] The working state of the after-cooling temperature control device is automatically adjusted according to the difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the actual measured temperature of the lubricating oil supply and the target temperature of the lubricating oil, so that the lubricating oil supply temperature is automatically adjusted to the target temperature.

[0017] Furthermore, the following contents are also included:

[0018] When the engine speed is lower than the preset speed threshold, the automatic safety control device is controlled to block the pipeline connecting the front heat exchange device and the engine oil tank, and discharge the engine oil return oil.

[0019] The present invention has the following beneficial effects:

[0020] The lubricating oil pressure high pressure automatic regulating system applicable to the aircraft engine of the present invention takes into account that the viscosity of the lubricating oil is greatly affected by the temperature. The lower the lubricating oil temperature, the greater the viscosity, and the higher the lubricating oil pressure during the operation of the engine. Therefore, the present invention adopts the method of cooling the lubricating oil to achieve lubricating oil pressure increase. The system forms a cooling water circulation system through a rear cooling temperature control device and a circulating water system. The cooling water and the return oil of the lubricating system are heat exchanged in the front heat exchange device, thereby realizing the cooling and cooling of the return oil of the lubricating oil to increase the viscosity of the lubricating oil, thereby increasing the lubricating oil pressure. In addition, the rear cooling temperature control device can convert the lubricating oil target temperature according to the real-time engine speed, and automatically adjust its own working state according to the difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the actual measured temperature of the lubricating oil supply and the lubricating oil target temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature, so that the lubricating oil pressure reaches the limit value, and the precise control of the lubricating oil temperature is realized, thereby realizing the high pressure boundary regulation function of the lubricating oil pressure, and realizing the automatic adjustment of the lubricating oil pressure in response to the engine state, which has the advantages of good practicality and high control accuracy. In addition, taking into account the lower the lubricating oil temperature, the greater the flow resistance, and the lubricating oil pressure high-pressure regulating system itself has certain cavities and pipelines, in order to avoid the influence of flow resistance on the lubricating oil supply, the lubricating oil pressure high-pressure regulating system is installed in the engine's return oil circuit through pipelines, which has the least impact on the engine's configuration.

[0021] In addition, the high-pressure automatic regulation method of lubricating oil pressure applicable to aircraft engines of the present invention also has the above advantages.

[0022] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 It is a schematic diagram of the principle of the existing engine lubrication system;

[0025] Figure 2 It is a schematic diagram of the principle of a high-pressure automatic regulation system of lubricating oil pressure applicable to an aircraft engine according to a preferred embodiment of the present application;

[0026] Figure 3 It is a flow chart of a method for automatically regulating the high pressure of lubricating oil pressure applicable to an aircraft engine according to a preferred embodiment of the present application;

[0027] Figure 4 It is another flow chart of the method for automatically regulating the high pressure of lubricating oil pressure applicable to aircraft engines according to the preferred embodiment of the present application.

[0028] Description of Reference Numerals

[0029] 1. Front heat exchange device; 2. Rear cooling temperature control device; 3. Circulating water system; 4. Automatic safety control device; 5. Valve; 6. Oil filter; 7. Second temperature sensor; 8. Third temperature sensor; 100. Engine oil tank; 200. Engine speed sensor; 300. Fuel supply temperature / pressure combination measuring point; 400. Oil boost pump; 500. Fuel oil radiator; 600. Return oil pump; 700. Return oil cooling device; 11. First temperature sensor; 21. Control system; 22. Heat dissipation unit; 23. First flow regulating device; 24. Second flow regulating device. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] Reference Figure 2The preferred embodiment of the present application provides a lubricating oil pressure high-pressure automatic regulating system suitable for aircraft engines, which includes a front heat exchange device 1, a rear cooling temperature control device 2 and a circulating water system 3, wherein the front heat exchange device 1 is connected to the oil return line of the lubricating system, the engine lubricating oil box 100 and the rear cooling temperature control device 2 respectively, and the rear cooling temperature control device 2 is also connected to the circulating water system 3. The circulating water system 3 provides normal temperature water, which is cooled by the rear cooling temperature control device 2 to become cooling water and transported to the front heat exchange device 1. At the same time, the lubricating oil return oil of the lubricating system is also transported to the front heat exchange device 1. The cooling water and the lubricating system return oil are heat exchanged in the front heat exchange device 1. The lubricating oil after heat exchange cooling enters the engine lubricating oil box 100, and the water after heat exchange heating flows back to the circulating water system 3 through the rear cooling temperature control device 2, thereby forming a cooling water circulation system. A first temperature sensor 11 is provided at the lubricating oil outlet of the front heat exchange device 1 to measure the lubricating oil temperature after heat exchange cooling. The post-cooling temperature control device 2 is electrically connected to the first temperature sensor 11, the engine speed sensor 200 and the oil supply temperature / pressure combination measuring point 300 on the main oil supply circuit of the lubrication system, respectively. The engine speed sensor 200 can collect the engine speed in real time, and the oil supply temperature / pressure combination measuring point 300 can collect the lubricating oil temperature and lubricating oil pressure on the main oil supply circuit of the lubrication system in real time. The post-cooling temperature control device 2 is used to convert the lubricating oil target temperature according to the real-time speed of the engine, and automatically adjust its own working state according to the difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the actual measured lubricating oil supply temperature and the lubricating oil target temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature.

[0032] It can be understood that the lubricating oil pressure high-pressure automatic regulating system of the present embodiment is applicable to aircraft engines. Considering that the viscosity of lubricating oil is greatly affected by temperature, the lower the lubricating oil temperature, the greater the viscosity, and the higher the lubricating oil pressure during the operation of the engine. Therefore, the present invention adopts the method of cooling the lubricating oil to achieve lubricating oil pressurization. The system is composed of a cooling water circulation system through a rear cooling temperature control device 2 and a circulating water system 3. The cooling water and the return oil of the lubricating system are heat exchanged in the front heat exchange device 1, thereby realizing the cooling and cooling of the return oil of the lubricating oil, so as to increase the viscosity of the lubricating oil and thus improve the lubricating oil pressure. Moreover, the post-cooling temperature control device 2 can convert the lubricating oil target temperature according to the real-time engine speed, and automatically adjust its own working state according to the difference between the lubricating oil actual temperature after heat exchange cooling and the lubricating oil supply actual temperature and the lubricating oil target temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature, so that the lubricating oil pressure reaches the limit value, and the lubricating oil temperature is accurately controlled, thereby realizing the high-pressure boundary adjustment function of the lubricating oil pressure, and realizing the automatic adjustment of the lubricating oil pressure in response to the engine state, which has the advantages of good practicality and high control accuracy. In addition, considering that the lower the lubricating oil temperature, the greater the flow resistance, and the lubricating oil pressure high-pressure adjustment system itself has certain volume chambers and pipelines, in order to avoid the influence of flow resistance on lubricating oil supply, the lubricating oil pressure high-pressure adjustment system is installed in the oil return path of the engine through pipelines, which has the least influence on the engine configuration.

[0033] It can be understood that the comprehensive pipeline flow resistance and the test space of the whole machine test bench are limited. This system innovatively designs an independent front heat exchange device 1 to be placed next to the engine, so as to achieve the minimum equipment lubricating oil volume and the shortest lubricating oil connection pipeline under the condition of achieving cooling capacity. Since the engine lubricating oil system is basically a built-in pipeline, it is only necessary to add an adapter to the engine return oil pipeline close to the engine lubricating oil tank end, and install the front heat exchange device 1 in series at the adapter, which has the least impact on the engine configuration and does not reduce the working assessment of the engine lubricating oil system.

[0034] It is understandable that since the lubricating oil pressure needs to reach the boundary assessment high-pressure limit value, the lubricating oil temperature needs to be reduced to a very low temperature. It is necessary to overcome the influence of ambient temperature and engine operation heating and match the engine operation status. The lubricating oil pressure high-pressure automatic adjustment system innovatively designs a post-cooling temperature control device 2 to achieve precise control of the lubricating oil temperature. Specifically, the post-cooling temperature control device 2 includes a control system 21, a heat dissipation unit 22, a first flow regulating device 23 and a second flow regulating device 24. The heat dissipation unit 22 is respectively connected to the front heat exchange device 1 and the circulating water system 3, and is used to cool the circulating water system 3 into cooling water and provide it to the front heat exchange device 1, and is also used to provide the water after heat exchange in the front heat exchange device 1 to the circulating water system 3. The first flow regulating device 23 is arranged on the pipeline connecting the heat dissipation unit 22 and the circulating water system 3, and is used to adjust the flow rate of normal temperature water provided by the circulating water system 3. The second flow regulating device 24 is respectively connected to the normal temperature water inlet and the cooling water outlet of the heat dissipation unit 22, and is used to adjust the flow rate of normal temperature water mixed with cooling water. The control system 21 is respectively connected to the heat dissipation unit 22, the first flow regulating device The device 23, the second flow regulating device 24, the first temperature sensor 11, the engine speed sensor 200 and the oil supply temperature / pressure combination measuring point 300 on the main oil supply line are electrically connected to obtain the lubricating oil target temperature according to the real-time engine speed, and according to the first temperature difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the lubricating oil target temperature, and the second temperature difference between the actual measured lubricating oil supply temperature and the lubricating oil target temperature, a staged control strategy is adopted to control the working state of at least one of the heat dissipation unit 22, the first flow regulating device 23 and the second flow regulating device 24, for example, controlling the cooling power of the heat dissipation unit 22, the normal temperature water flow adjusted by the first flow regulating device 23, and the mixed normal temperature water flow adjusted by the second flow regulating device 24, so as to realize accurate automatic control of the lubricating oil temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature. Among them, the first flow regulating device 23 can extract normal temperature water from the circulating water system 3 according to the flow demand for cooling water. The heat dissipation unit 22 is composed of a multi-stage power heat sink, which works in combination according to the power demand and is used to adjust the temperature of the cooling water. The second flow regulating device 24 is used to achieve the mixing of normal temperature water and cooling water, and adjust the flow of the mixed normal temperature water, so as to achieve the effect of fine-tuning the cooling water temperature and thus fine-tuning the lubricating oil temperature.

[0035] It can be understood that in order to achieve stable operation of the engine in different working states, state changes, and precise control of lubricating oil high pressure regulation during acceleration and deceleration processes between low and high states, the post-cooling temperature control device 2 adopts a control method in which the lubricating oil pressure regulation responds to the engine state matching, and automatically follows the engine state change for control. Specifically, a functional relationship between the engine speed and the lubricating oil temperature is first established. The engine speed is a direct feedback of the engine state. With the real-time engine speed as input, the control system 21 can convert the lubricating oil target temperature in real time according to the functional relationship between the engine speed and the lubricating oil temperature, and then automatically adjust the lubricating oil temperature according to the temperature difference between the actual lubricating oil temperature and the lubricating oil target temperature, thereby realizing automatic adjustment of the lubricating oil pressure and achieving the effect of automatic precise control following the engine state change.

[0036] The process of establishing the functional relationship between the engine speed and the lubricating oil temperature is as follows: first, the characteristic functional relationship between the lubricating oil pump speed and the lubricating oil flow rate is established, which can be expressed as: , Q represents the oil flow rate of the lubricating oil pump, S represents the area swept by one tooth of the internal gear of the lubricating oil pump, Z represents the number of teeth of the internal gear, n represents the speed of the internal gear, and b represents the rotor width of the lubricating oil pump. Represents the volumetric efficiency of the lubricating oil pump. Then, based on the fact that the lubricating oil pump is driven by the engine, according to the transmission relationship between the engine and the lubricating oil pump, the functional relationship between the engine speed and the lubricating oil flow rate can be established, which can be expressed as: , k represents the transmission coefficient between the engine and the lubricating oil pump, Indicates the engine speed. Next, the simulation calculation model of the engine supercharging system is used to calculate the target lubricating oil limit pressure under various flow conditions, and the target lubricating oil temperature is calculated in reverse, thereby obtaining the functional relationship between the engine speed and the lubricating oil temperature. The simulation calculation process belongs to the prior art, and the specific principle and function expression are not described here.

[0037] It can be understood that the ultimate control target of the post-cooling temperature control device 2 for lubricating oil temperature control is that the engine lubricating oil supply temperature is not higher than the lubricating oil target temperature and is controlled within a certain range. In order to achieve precise regulation and control of the lubricating oil temperature, the post-cooling temperature control device 2 is adjusted in multiple stages according to the difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the lubricating oil target temperature, and the difference between the engine lubricating oil supply temperature and the target temperature. The first flow regulating device 23, the second flow regulating device 24 and the heat dissipation unit 22 are used as the execution part to perform the adjustment. For the convenience of explanation, the following definitions are first made: △1 = the actual measured temperature of the lubricating oil after heat exchange cooling T1-the lubricating oil target temperature, △2 = the actual measured temperature of the lubricating oil supply T m - Lubricating oil target temperature, △1 is the first temperature difference, △2 is the second temperature difference.

[0038] Specifically, in the initial stage, the difference between the lubricating oil temperature and the target temperature is relatively large. Generally, the lubricating oil pressure high-pressure regulating system starts to work to continuously cool the lubricating oil or the engine state changes significantly, resulting in a large increase in the lubricating oil temperature. At this time, the lubricating oil needs to be cooled down quickly. Therefore, the first temperature difference △1 is used as the adjustment control judgment condition, because △1 can directly feedback the adjustment effect of the lubricating oil pressure high-pressure automatic adjustment system to achieve coarse adjustment of the lubricating oil supply temperature; in the subsequent stage, the second temperature difference △2 is used as the adjustment control judgment condition to achieve fine adjustment of the lubricating oil supply temperature, thereby achieving fine adjustment of the lubricating oil temperature.

[0039] It can be understood that the present invention uses the first temperature difference △1 as the adjustment and control judgment condition in the initial stage, which can more directly and quickly feedback the adjustment effect of the lubricating oil pressure high-pressure automatic adjustment system, which is conducive to achieving rapid adjustment of the lubricating oil supply temperature. In the subsequent stage, the second temperature difference △2 is used as the adjustment and control judgment condition, which can more accurately feedback the adjustment effect of the lubricating oil temperature, which is conducive to achieving fine adjustment of the lubricating oil temperature. By adopting the method of coarse adjustment and fine adjustment coordinated with each other, not only the lubricating oil temperature adjustment efficiency is improved, but also the lubricating oil temperature adjustment accuracy is improved.

[0040] It can be understood that in the first stage, when the first temperature difference △1 is greater than the first preset threshold, the control system 21 controls the first flow regulating device 23 and the heat dissipation unit 22 to operate at maximum flow and maximum power respectively to achieve rapid cooling of the lubricating oil.

[0041] When the first temperature difference △1 is not greater than the first preset threshold, the lubricating oil temperature is significantly reduced, and the second stage, i.e., the first level lubricating oil temperature fine adjustment stage, is entered. In order to ensure the temperature adjustment accuracy, the second temperature difference △2 is used as the adjustment control judgment condition from the second stage. If the second temperature difference △2 is greater than or equal to the third preset threshold and less than or equal to the second preset threshold, the control system 21 also determines the actual measured lubricating oil supply temperature T m If the measured temperature of lubricating oil supply is T m The engine state may be in a declining state or the lubricating oil pressure high pressure automatic regulating system needs to be slowly adjusted under the current engine state. Then the control system 21 controls the normal temperature water flow rate output by the first flow regulating device 23 to gradually decrease as the second temperature difference △2 decreases, that is, the cooling water flow rate gradually decreases as the second temperature difference △2 decreases until the measured lubricating oil supply temperature T m Close to the target temperature; if the measured temperature of lubricating oil supply is T mThe engine state may be in an upward state or the oil pressure high pressure automatic regulating system is insufficient in the current engine state. Then the control system 21 controls the first flow regulating device 23 to operate at the maximum regulating flow rate and continues to cool the lubricating oil rapidly until the measured lubricating oil supply temperature T m Approaching the target temperature, wherein the second preset threshold is less than the first preset threshold.

[0042] When the second temperature difference △2 is less than the third preset threshold, the third stage is entered, that is, the second-level lubricating oil temperature fine adjustment stage. If the second temperature difference △2 is greater than or equal to zero and less than the third preset threshold, the control system 21 further determines the change trend of the lubricating oil supply measured temperature. If the lubricating oil supply measured temperature shows a downward trend, it indicates that the engine state may be in a declining state or the lubricating oil pressure high pressure automatic adjustment system needs to be weakened under the current engine state. Then, the control system 21 controls the cooling power of the heat dissipation unit 22 to gradually decrease as the second temperature difference decreases until the lubricating oil supply measured temperature T m When the target temperature is reached, if the measured temperature of the lubricating oil supply shows an upward trend, it indicates that the engine state may be in an upward state or the lubricating oil pressure high pressure automatic regulation system needs to be regulated more under the current engine state, then the control system 21 controls the cooling unit 22 to work at maximum power until the measured temperature of the lubricating oil supply T m Reach target temperature.

[0043] When the second temperature difference △2 is less than zero, the fourth stage, i.e., the third level lubricating oil temperature fine adjustment stage, is entered. If the second temperature difference is greater than or equal to the fourth preset threshold value and less than zero, the control system 21 further determines the change trend of the lubricating oil supply measured temperature. If the lubricating oil supply measured temperature shows a downward trend, it indicates that the engine state may be in a declining state or the lubricating oil pressure high pressure automatic adjustment system is adjusted and controlled to weaken the fine adjustment under the current engine state. Then, the control system 21 controls the mixed normal temperature water flow output by the second flow regulating device 24 to gradually decrease as the second temperature difference increases until the lubricating oil supply measured temperature T m When the target temperature is reached, if the measured temperature of the lubricating oil supply shows an upward trend, it indicates that the engine state may be in an upward state or the adjustment and control of the lubricating oil pressure high pressure automatic adjustment system needs to be strengthened under the current engine state, then the control system 21 controls the mixed normal temperature water flow output by the second flow adjustment device 24 to be zero until the measured temperature of the lubricating oil supply T m When the target temperature is reached, the lubricating oil pressure reaches the lubricating oil limit pressure target. The fourth preset threshold is less than the third preset threshold.

[0044] It can be understood that in the rapid cooling stage (i.e., the first stage), the present invention controls the first flow regulating device 23 and the heat dissipation unit 22 to work at the maximum flow and the highest power respectively, so as to provide the cooling water with the maximum flow and the lowest cooling water temperature, so as to achieve rapid cooling of the lubricating oil; in the first-level lubricating oil temperature fine adjustment stage (i.e., the second stage), according to the measured lubricating oil supply temperature T m The change trend of the normal temperature water flow output by the first flow regulating device 23 is controlled, and the first level of fine adjustment of the lubricating oil temperature is performed by adjusting the cooling water flow to ensure that the lubricating oil supply temperature quickly and accurately approaches the target temperature; in the second level of lubricating oil temperature fine adjustment stage (i.e., the third stage), according to the actual measured lubricating oil supply temperature T m The cooling power of the heat sink 22 is controlled according to the change trend of the cooling water temperature, and the lubricating oil temperature is finely adjusted at the second level by adjusting the cooling water temperature to ensure that the lubricating oil supply temperature accurately reaches the target temperature; in the third level of lubricating oil temperature fine adjustment stage (i.e., the fourth stage), according to the actual measured lubricating oil supply temperature T m The mixed normal temperature water flow output by the second flow regulating device 24 is controlled according to the changing trend of , and the lubricating oil temperature is finely regulated at the third level by finely adjusting the cooling water temperature to ensure that the lubricating oil supply temperature is not higher than the target temperature and is controlled within a certain range, thereby achieving the final control target. By adopting the one-stage rapid cooling and three-stage fine temperature adjustment method, the rapid and precise adjustment of the lubricating oil temperature is achieved at the same time, and the actual measured temperature T of the lubricating oil supply is taken into account in the fine temperature adjustment stage. m The changing trend of is used as the judgment condition, which further ensures the accuracy and stability of fine temperature control.

[0045] Optionally, the lubricating oil pressure high-pressure automatic regulation system also includes an automatic safety control device 4 electrically connected to the control system 21, and the automatic safety control device 4 is respectively connected to the pipeline connecting the front heat exchange device 1 and the return oil circuit of the engine lubrication system, and the pipeline connecting the front heat exchange device 1 and the engine lubricating oil tank 100. The control system 21 is also used to control the automatic safety control device 4 to block the pipeline connecting the front heat exchange device 1 and the engine lubricating oil tank 100 when the engine speed is lower than a preset speed threshold, and discharge the engine lubricating oil return oil.

[0046] It can be understood that since the front heat exchange device 1 is installed in the return oil circuit of the engine lubrication system, when the engine runs at a low speed, the oil supply capacity of the engine lubrication system is significantly weakened, but the lubrication return oil still maintains a certain pressure, which pushes the lubricating oil in the cavity of the front heat exchange device 1 to continuously flow back through the pipeline into the engine lubricating oil tank 100, causing the lubricating oil level to rise above the safe position, and then may enter the engine airflow channel and affect the engine safety. Therefore, in order to prevent the backflow of lubricating oil, an automatic safety control device 4 is provided. When the engine is in normal operation, that is, when the engine speed is not lower than the preset speed threshold, the control system 21 controls the automatic safety control device 4 to keep the engine return oil circuit and the engine lubricating oil tank 100 connected to the front heat exchange device 1, so that the engine lubricating return oil can enter the front heat exchange device 1, and the lubricating oil cooled by the front heat exchange device 1 returns to the engine lubricating oil tank 100, ensuring the normal circulation of the lubricating oil system during the operation of the engine; and when the engine is stopped or in an abnormal operation state, that is, when the engine speed is lower than the preset speed threshold, the control system 21 controls the automatic safety control device 4 to block the pipeline connecting the front heat exchange device 1 and the engine lubricating oil tank 100 to prevent the backflow of lubricating oil, and discharge the engine lubricating oil return oil, and the lubricating oil return oil no longer enters the front heat exchange device 1, and is directly depressurized. Among them, the automatic safety control device 4 can adopt an interlocking control valve mode. For example, solenoid valves are arranged on the oil inlet line of the front heat exchange device 1 and on the pipeline connecting the front heat exchange device 1 and the engine lubricating oil tank 100. When the engine is operating normally, the solenoid valve on the oil inlet line of the front heat exchange device 1 is controlled to be closed, and the solenoid valve on the pipeline connecting the front heat exchange device 1 and the engine lubricating oil tank 100 is controlled to be opened. When the engine is stopped or in an abnormal operating state, the solenoid valve on the oil inlet line of the front heat exchange device 1 is controlled to be opened, and the solenoid valve on the pipeline connecting the front heat exchange device 1 and the engine lubricating oil tank 100 is controlled to be closed.

[0047] In addition, the lubricating oil inlet and cooling water outlet of the front heat exchange device 1, the water inlet of the first flow regulating device 23 and the cooling water outlet of the heat dissipation unit 22 are all provided with valves 5 for easy on-off control. In addition, an oil filter 6 is also provided on the pipeline connecting the front heat exchange device 1 and the engine lubricating oil tank 100 for filtering the lubricating oil return. In addition, a second temperature sensor 7 is also provided at the lubricating oil inlet of the front heat exchange device 1 for measuring the engine return oil temperature, and a third temperature sensor 8 is provided at the cooling water outlet of the heat dissipation unit 22 for measuring the cooling water temperature, so as to facilitate feedback adjustment of the cooling water temperature.

[0048] Therefore, the high-pressure automatic oil pressure regulating system suitable for aircraft engines of the present invention integrates the influencing factors such as the test bench space layout, oil flow resistance, engine configuration, etc., utilizes the principle that the oil temperature affects the oil pressure, and achieves the purpose of regulating the oil pressure by accurately adjusting the oil temperature. It has the function of automatically adjusting the oil pressure in real time according to the engine status, is safe and reliable, and meets the high-pressure boundary assessment indicators of the oil pressure in different working conditions of the engine.

[0049] In addition, if Figure 3 As shown, another embodiment of the present invention further provides a method for automatically regulating the high pressure of lubricating oil pressure applicable to an aircraft engine, preferably using the above-mentioned automatic regulating system for high pressure of lubricating oil pressure applicable to an aircraft engine, comprising the following contents:

[0050] Step S1: collecting the real-time engine speed, the actual temperature of the lubricating oil after heat exchange cooling, and the actual temperature of the lubricating oil supply;

[0051] Step S2: Calculate the target temperature of the lubricating oil according to the real-time speed of the engine;

[0052] Step S3: Automatically adjust the working state of the post-cooling temperature control device according to the difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the actual measured temperature of the lubricating oil supply and the target temperature of the lubricating oil, so that the lubricating oil supply temperature is automatically adjusted to the target temperature.

[0053] It can be understood that the high-pressure automatic adjustment method of lubricating oil pressure applicable to aircraft engines of this embodiment takes into account that the viscosity of lubricating oil is greatly affected by temperature. The lower the lubricating oil temperature, the greater the viscosity, and the higher the lubricating oil pressure during the operation of the engine. Therefore, the present invention adopts the method of cooling the lubricating oil to achieve lubricating oil pressurization. The method converts the lubricating oil target temperature according to the real-time engine speed, and automatically adjusts its own working state according to the difference between the lubricating oil measured temperature after heat exchange cooling and the lubricating oil supply measured temperature and the lubricating oil target temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature, so that the lubricating oil pressure reaches the limit value, and the precise control of the lubricating oil temperature is realized, thereby realizing the high-pressure boundary adjustment function of the lubricating oil pressure, and realizing the automatic adjustment of the lubricating oil pressure in response to the engine state, which has the advantages of good practicality and high control accuracy.

[0054] In addition, if Figure 4 As shown, the lubricating oil pressure high pressure automatic regulation method also includes the following contents:

[0055] Step S4: When the engine speed is lower than a preset speed threshold, the automatic safety control device is controlled to block the pipeline connecting the front heat exchange device and the engine oil tank, and the engine oil return oil is discharged.

[0056] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0057] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high pressure automatic regulating system for lubricating oil pressure of an aircraft engine, characterized in that: The invention comprises a front heat exchange device (1), a rear cooling temperature control device (2) and a circulating water system (3), wherein the front heat exchange device (1) is connected to the oil return line of the lubrication system, the engine oil tank (100) and the rear cooling temperature control device (2) respectively, and the rear cooling temperature control device (2) is also connected to the circulating water system (3), and the circulating water system (3) provides normal temperature water which is cooled by the rear cooling temperature control device (2) to become cooling water, and the cooling water and the return oil of the lubrication system are heat exchanged in the front heat exchange device (1), and the lubrication oil cooled by heat exchange enters the engine oil tank (100), and the water heated by heat exchange flows back to the circulating water system through the rear cooling temperature control device (2). The water circulation system (3) comprises a first temperature sensor (11) disposed at the lubricating oil outlet of the front heat exchange device (1) for measuring the lubricating oil temperature after heat exchange cooling; the rear temperature control device (2) is electrically connected to the first temperature sensor (11), the engine speed sensor (200) and the oil supply temperature / pressure combination measuring point (300) on the main oil supply line of the lubrication system, respectively, for converting the lubricating oil target temperature according to the real-time speed of the engine, and automatically adjusting its own working state according to the difference between the actual measured lubricating oil temperature after heat exchange cooling and the actual measured lubricating oil supply temperature and the lubricating oil target temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature.

2. The lubricating oil pressure high pressure automatic regulating system suitable for aircraft engines as claimed in claim 1, characterized in that: The post-cooling temperature control device (2) comprises a control system (21), a heat dissipation unit (22), a first flow regulating device (23) and a second flow regulating device (24). The heat dissipation unit (22) is respectively connected to the pre-heat exchange device (1) and the circulating water system (3) and is used to cool the circulating water system (3) into cooling water and provide it to the pre-heat exchange device (1). It is also used to provide the water after heat exchange in the pre-heat exchange device (1) to the circulating water system (3). The first flow regulating device (23) is arranged on the pipeline connecting the heat dissipation unit (22) and the circulating water system (3) and is used to regulate the flow rate of normal temperature water provided by the circulating water system (3). The second flow regulating device (24) is respectively connected to the normal temperature water inlet and the cooling water outlet of the heat dissipation unit (22) and is used to adjust the flow rate of the normal temperature water provided by the circulating water system (3). The control system (21) is used to adjust the flow rate of the normal temperature water mixed with the cooling water. The control system (21) is electrically connected to the heat dissipation unit (22), the first flow regulating device (23), the second flow regulating device (24), the first temperature sensor (11), the engine speed sensor (200) and the oil supply temperature / pressure combination measuring point (300) on the main oil supply line, respectively, and is used to convert the lubricating oil target temperature according to the real-time engine speed, and adopt a staged control strategy to control the working state of at least one of the heat dissipation unit (22), the first flow regulating device (23) and the second flow regulating device (24) according to a first temperature difference between the actual temperature of the lubricating oil after heat exchange cooling and the lubricating oil target temperature and a second temperature difference between the actual temperature of the lubricating oil supply and the lubricating oil target temperature, so that the lubricating oil supply temperature is automatically adjusted to the target temperature.

3. The lubricating oil pressure high pressure automatic regulating system suitable for aircraft engines as claimed in claim 2, characterized in that: In the initial stage, the first temperature difference is used as the adjustment control judgment condition to achieve coarse adjustment of the lubricating oil supply temperature; in the subsequent stage, the second temperature difference is used as the adjustment control judgment condition to achieve fine adjustment of the lubricating oil supply temperature.

4. The lubricating oil pressure high pressure automatic regulating system suitable for aircraft engines as claimed in claim 3, characterized in that: When the first temperature difference is greater than a first preset threshold, the control system (21) controls the first flow regulating device (23) and the heat dissipation unit (22) to operate at maximum flow and maximum power respectively, so as to achieve rapid cooling of the lubricating oil.

5. The lubricating oil high pressure automatic regulating system suitable for aircraft engines as claimed in claim 4, characterized in that: When the first temperature difference is not greater than the first preset threshold value, and the second temperature difference is greater than or equal to the third preset threshold value and less than or equal to the second preset threshold value, the control system (21) further determines the change trend of the measured temperature of the lubricating oil supply. If the measured temperature of the lubricating oil supply shows a downward trend, the control system (21) controls the normal temperature water flow rate output by the first flow regulating device (23) to gradually decrease as the second temperature difference decreases, until the measured temperature of the lubricating oil supply approaches the target temperature. If the measured temperature of the lubricating oil supply shows an upward trend, the control system (21) controls the first flow regulating device (23) to operate at a maximum regulated flow rate until the measured temperature of the lubricating oil supply approaches the target temperature, wherein the second preset threshold value is less than the first preset threshold value.

6. The lubricating oil high pressure automatic regulating system suitable for aircraft engines as claimed in claim 5, characterized in that: When the second temperature difference is greater than or equal to zero and less than a third preset threshold, the control system (21) further determines a change trend of the measured lubricating oil supply temperature. If the measured lubricating oil supply temperature shows a downward trend, the control system (21) controls the power of the heat dissipation unit (22) to gradually decrease as the second temperature difference decreases until the measured lubricating oil supply temperature reaches a target temperature. If the measured lubricating oil supply temperature shows an upward trend, the control system (21) controls the heat dissipation unit (22) to operate at maximum power until the measured lubricating oil supply temperature reaches the target temperature.

7. The lubricating oil high pressure automatic regulating system suitable for aircraft engines as claimed in claim 6, characterized in that: When the second temperature difference is greater than or equal to a fourth preset threshold and less than zero, the control system (21) further determines a change trend of the measured temperature of the lubricating oil supply. If the measured temperature of the lubricating oil supply shows a downward trend, the control system (21) controls the mixed normal temperature water flow rate output by the second flow regulating device (24) to gradually decrease as the second temperature difference increases until the measured temperature of the lubricating oil supply reaches a target temperature. If the measured temperature of the lubricating oil supply shows an upward trend, the control system (21) controls the mixed normal temperature water flow rate output by the second flow regulating device (24) to be zero until the measured temperature of the lubricating oil supply reaches the target temperature, wherein the fourth preset threshold is less than the third preset threshold.

8. The lubricating oil high pressure automatic regulating system suitable for aircraft engines as claimed in claim 2, characterized in that: It also includes an automatic safety control device (4) electrically connected to the control system (21), the automatic safety control device (4) being respectively connected to a pipeline connecting the front heat exchange device (1) and an oil return line of an engine lubrication system, and a pipeline connecting the front heat exchange device (1) and an engine lubricating oil tank (100), and the control system (21) is further used to control the automatic safety control device (4) to block the pipeline connecting the front heat exchange device (1) and the engine lubricating oil tank (100) when the engine speed is lower than a preset speed threshold, and to discharge the engine lubricating oil return.

9. A method for automatically regulating the high pressure of lubricating oil applied to an aircraft engine, using the automatic regulating system for high pressure of lubricating oil applied to an aircraft engine as claimed in any one of claims 1 to 8, characterized in that: Includes the following: Collect the real-time engine speed, the actual temperature of the lubricating oil after heat exchange cooling, and the actual temperature of the lubricating oil supply; The lubricating oil target temperature is obtained by converting the real-time engine speed; The working state of the after-cooling temperature control device is automatically adjusted according to the difference between the actual measured temperature of the lubricating oil after heat exchange cooling and the actual measured temperature of the lubricating oil supply and the target temperature of the lubricating oil, so that the lubricating oil supply temperature is automatically adjusted to the target temperature.

10. The high pressure automatic regulation method of lubricating oil pressure applicable to aircraft engines as claimed in claim 9, characterized in that: Also included are the following: When the engine speed is lower than the preset speed threshold, the automatic safety control device is controlled to block the pipeline connecting the front heat exchange device and the engine oil tank, and discharge the engine oil return oil.

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