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CN-122014837-A - Oil supply system working under negative pressure environment and control method thereof

CN122014837ACN 122014837 ACN122014837 ACN 122014837ACN-122014837-A

Abstract

The invention relates to an oil supply system working in a negative pressure environment and a control method thereof. The invention comprises an oil supply device, an adjusting and monitoring device, a first vacuum oil return device, a vacuum pump device and a control device, wherein the first vacuum oil return device comprises a first oil return oil collecting tank, a first oil inlet valve, a first vacuumizing valve, a first charging valve, a first pressure sensor, a first liquid level sensor, a first oil discharge valve, a first oil return check valve and a first air source, the second vacuum oil return device comprises a second oil return oil collecting tank, a second oil inlet valve, a second vacuumizing valve, a second charging valve, a second pressure sensor, a second liquid level sensor, a second oil discharge valve, a second oil return check valve and a second air source, and the control device enables the first oil return oil collecting tank and the second oil return oil collecting tank to alternately inlet and discharge oil in a vacuum environment. The invention can realize lubrication oil return under the negative pressure environment and eliminate the unsmooth influence of oil return caused under the negative pressure environment.

Inventors

  • WU WENGUANG
  • CHEN MINGFENG
  • HAN XU
  • QIN QIHAO
  • WANG CHAOJIE
  • ZHANG ZHUANG

Assignees

  • 中国航发控制系统研究所

Dates

Publication Date
20260512
Application Date
20260212

Claims (10)

  1. 1. An oil supply system operating in a negative pressure environment, comprising: an oil supply device (100) for supplying pressurized lubricating oil to transmission equipment located in the environmental chamber; An adjustment monitoring device (200) arranged between the oil supply device (100) and the transmission equipment, and used for adjusting and monitoring flow and pressure information of lubricating oil supplied to the transmission equipment; The first vacuum oil return device (400) comprises a first oil return oil collection tank (4-2), a first oil inlet valve (4-6), a first vacuumizing valve (4-7), a first charging valve (4-3), a first pressure sensor (4-4), a first liquid level sensor (4-5), a first oil discharge valve (4-1) and a first oil return check valve (4-9) arranged behind the first oil discharge valve (4-1), wherein the first oil inlet valve (4-6), the first vacuumizing valve (4-7), the first charging valve (4-3) are respectively arranged on the first oil return oil collection tank (4-2), and the first charging valve (4-3) is connected with a first air source (4-8); The second vacuum oil return device (500) comprises a second oil return oil collection tank (5-2), a second oil inlet valve (5-6), a second vacuumizing valve (5-7), a second charging valve (5-3), a second pressure sensor (5-4), a second liquid level sensor (5-5), a second oil discharge valve (5-1) and a second oil return check valve (5-9) arranged behind the second oil discharge valve (5-1), wherein the second oil inlet valve (5-6), the second vacuumizing valve (5-7) and the second charging valve (5-3) are respectively arranged on the second oil return oil collection tank (5-2), and the second charging valve (5-3) is connected with a second air source (5-8); The vacuum pump device (300) is respectively communicated with the first vacuumizing valve (4-7) and the second vacuumizing valve (5-7) through vacuum pipelines and is used for vacuumizing the internal pressure of the first oil return oil collecting tank (4-2) and the internal pressure of the second oil return oil collecting tank (5-2) to be lower than the vacuum degree of the pressure of the environmental cabin; The control device (600) is respectively and electrically connected with the adjusting and monitoring device (200), the vacuum pump device (300), the first vacuum oil return device (400) and the second vacuum oil return device (500), and the control device (600) is configured to control the vacuum pump device (300), the first vacuum oil return device (400) and the second vacuum oil return device (500) to operate according to preset logic according to data acquired correspondingly by the first pressure sensor (4-4), the first liquid level sensor (4-5), the second pressure sensor (5-4) and the second liquid level sensor (5-5), so that the first oil return oil collection tank (4-2) and the second oil return oil collection tank (5-2) alternately enter and discharge oil in a vacuum environment.
  2. 2. An oil supply system operating in a negative pressure environment according to claim 1, characterized in that the oil supply device (100) comprises an oil supply tank (1-0), an oil supply pump (1-1) connected to an oil outlet end of the oil supply tank (1-0), an overflow valve (1-2) connected between the oil supply pump (1-1) and the oil supply tank (1-0), and a cooler (1-3) connected to an oil return end of the oil supply tank (1-0), the cooler (1-3) being connected to the first oil return check valve (4-9) and the second oil return check valve (5-9), respectively.
  3. 3. An oil supply system operating in a negative pressure environment according to claim 2, characterized in that the regulating and monitoring device (200) comprises a regulating valve (2-1), a flow meter (2-2) and an oil supply pressure sensor (2-3) which are connected in sequence, wherein the oil outlet end of the oil supply pump (1-1) is connected with the regulating valve (2-1), and the oil supply pressure sensor (2-3) is connected with the transmission equipment.
  4. 4. An oil supply system operating in a negative pressure environment according to claim 1, characterized in that the vacuum pump arrangement (300) comprises a vacuum pump (3-1), a ball valve (3-2), an air filter (3-3) and a non-return valve (3-4) connected in sequence, the non-return valve (3-4) being connected to the first (4-7) and the second (5-7) evacuation valve, respectively; The vacuumizing capacity of the vacuum pump (3-1) is not lower than the vacuum degree required by the environmental chamber, and the time from the gauge pressure of 0.3MPa to the vacuum degree required by the environmental chamber is not lower than eighty percent of the time when the liquid levels of the first oil return oil collecting tank (4-2) and the second oil return oil collecting tank (5-2) rise to the upper limit of oil discharge respectively.
  5. 5. An oil supply system operating in a negative pressure environment according to claim 1, characterized in that the first oil return oil collection tank (4-2) and the second oil return oil collection tank (5-2) are both cylindrical metal tanks, and are each capable of withstanding a negative pressure of not less than 0.1MPa and of withstanding a positive pressure of not less than 0.5 MPa.
  6. 6. An oil supply system operating in a negative pressure environment according to claim 1, characterized in that the respective oil inlets of the first oil return sump (4-2) and the second oil return sump (5-2) are arranged at more than three-fourths of the effective height of the respective oil tanks, and that the oil drain is arranged at the bottom side wall of the respective oil tanks.
  7. 7. An oil supply system operating in a negative pressure environment according to claim 1, characterized in that the first pressure sensor (4-4) and the first liquid level sensor (4-5) are both installed at the top of the first oil return oil collecting tank (4-2), the first pressure sensor (4-4) monitors the internal air pressure of the first oil return oil collecting tank (4-2) in real time, and the effective detection length of the first liquid level sensor (4-5) is greater than four fifths of the total internal height of the first oil return oil collecting tank (4-2) so as to monitor the internal liquid level change of the first oil return oil collecting tank (4-2) in real time; The first oil discharge valve (4-1) is arranged on the side wall of the bottom of the first oil return oil collection tank (4-2), and the first inflation valve (4-3), the first oil inlet valve (4-6) and the first vacuumizing valve (4-7) are all arranged on the top of the first oil return oil collection tank (4-2).
  8. 8. An oil supply system operating in a negative pressure environment according to claim 1, characterized in that the second pressure sensor (5-4) and the second liquid level sensor (5-5) are both installed at the top of the second oil return oil collection tank (5-2), the second pressure sensor (5-4) monitors the internal air pressure of the second oil return oil collection tank (5-2) in real time, and the effective detection length of the second liquid level sensor (5-5) is greater than four fifths of the total internal height of the second oil return oil collection tank (5-2) so as to monitor the internal liquid level change of the second oil return oil collection tank (5-2) in real time; the second oil discharge valve (5-1) is arranged on the side wall of the bottom of the second oil return oil collection tank (5-2), and the second inflation valve (5-3), the second oil inlet valve (5-6) and the second vacuumizing valve (5-7) are all arranged on the top of the second oil return oil collection tank (5-2).
  9. 9. The oil supply system working under a negative pressure environment according to claim 1, wherein the first oil discharge valve (4-1), the first oil inlet valve (4-6), the first inflation valve (4-3), the first vacuumizing valve (4-7), the second oil discharge valve (5-1), the second oil inlet valve (5-6), the second inflation valve (5-3) and the second vacuumizing valve (5-7) are pneumatic ball valves with valve position indicators and capable of being opened and closed under remote control.
  10. 10. A control method of an oil supply system operating in a negative pressure environment, characterized in that the control method comprises, based on the oil supply system according to any one of claims 1-9: S1, initial vacuumizing, namely controlling to close a first oil discharge valve (4-1), a second oil discharge valve (5-1), a first inflation valve (4-3), a second inflation valve (5-3), a first oil inlet valve (4-6) and a second oil inlet valve (5-6), controlling to open a first vacuumizing valve (4-7) and a second vacuumizing valve (5-7), starting a vacuum pump device (300), and simultaneously vacuumizing the internal pressure of a first oil return oil collecting tank (4-2) and the internal pressure of a second oil return oil collecting tank (5-2) to a set vacuum degree lower than the atmospheric pressure of an environmental cabin; S2, oil supply, namely controlling and starting an oil supply device (100) to supply lubricating oil to transmission equipment, and regulating and monitoring flow and pressure information of the lubricating oil in real time through a regulating and monitoring device (200); S3, controlling to open a first oil inlet valve (4-6), controlling to close the first oil inlet valve (4-6) when a first liquid level sensor (4-5) detects that the liquid level of a first oil return oil collecting tank (4-2) reaches a preset upper limit, opening a second oil inlet valve (5-6), closing a first vacuumizing valve (4-7), and opening a first oil discharge valve (4-1) and a first charging valve (4-3) under the condition that the first pressure sensor (4-4) detects that the pressure of the first oil return oil collecting tank (4-2) meets an oil discharge threshold value, so that the first oil return oil collecting tank (4-2) starts to discharge oil; s4, first re-vacuumizing, namely when the liquid level of the first oil return oil collection tank (4-2) reaches a preset lower limit, closing the first air charging valve (4-3), closing the first oil discharging valve (4-1), and re-opening the first vacuumizing valve (4-7) to vacuumize the first oil return oil collection tank (4-2) again for standby; S5, switching and discharging oil in a second mode, namely when the second liquid level sensor (5-5) detects that the liquid level of the second oil return oil collecting tank (5-2) reaches a preset upper limit, closing the second oil inlet valve (5-6), opening the first oil inlet valve (4-6), closing the second vacuumizing valve (5-7), and opening the second oil discharge valve (5-1) and the second charging valve (5-3) under the condition that the pressure in the second oil return oil collecting tank (5-2) detected by the second pressure sensor (5-4) meets an oil discharge threshold value, so that the second oil return oil collecting tank (5-2) starts to discharge oil; s6, second vacuumizing, namely when the second liquid level sensor (5-5) detects that the liquid level of the second oil return oil collecting tank (5-2) is reduced to a preset lower limit, closing the second air charging valve (5-3) and the second oil discharging valve (5-1), and re-opening the second vacuumizing valve (5-7) to vacuumize the second oil return oil collecting tank (5-2) again; S7, circulating the control device (600) (6) to execute the steps S2 to S6 according to the real-time data of the first pressure sensor (4-4), the first liquid level sensor (4-5), the second pressure sensor (5-4) and the second liquid level sensor (5-5) so that the first oil return oil collecting tank (4-2) and the second oil return oil collecting tank (5-2) alternately take oil and discharge oil in a vacuum environment.

Description

Oil supply system working under negative pressure environment and control method thereof Technical Field The invention relates to the technical field of aerospace tests, in particular to an oil supply system working under a negative pressure environment and a control method thereof. Background When the aeroengine control system is used for carrying out a negative pressure environment test, oil is required to be supplied to high-speed transmission equipment in an environment cabin for lubrication, and the transmission equipment cannot be absolutely sealed, so that a negative pressure environment can be formed in the transmission equipment, lubricating oil which is supplied to the transmission equipment for lubrication is accumulated in the equipment and cannot normally return to an atmospheric oil supply device, and the normal operation of the oil supply system is affected. Therefore, a special lubrication oil supply system is designed according to the requirements of the negative pressure environment test of the control system of the aero-engine so as to meet the test requirements. Disclosure of Invention Therefore, the oil supply system and the control method thereof can realize lubrication oil return in the negative pressure environment and eliminate the unsmooth influence of oil return in the negative pressure environment. In order to solve the above technical problems, the present invention provides an oil supply system operating in a negative pressure environment, comprising: An oil supply device for supplying pressurized lubricating oil to the transmission equipment in the environmental chamber; the adjusting and monitoring device is arranged between the oil supply device and the transmission equipment and is used for adjusting and monitoring flow and pressure information of lubricating oil supplied to the transmission equipment; The first vacuum oil return device comprises a first oil return oil collection tank, a first oil inlet valve, a first vacuumizing valve, a first charging valve, a first pressure sensor, a first liquid level sensor, a first oil discharge valve and a first oil return one-way valve arranged behind the first oil discharge valve, wherein the first oil inlet valve, the first vacuumizing valve, the first charging valve, the first pressure sensor, the first liquid level sensor, the first oil discharge valve and the first oil return one-way valve are respectively arranged on the first oil return oil collection tank; The second vacuum oil return device comprises a second oil return oil collection tank, a second oil inlet valve, a second vacuumizing valve, a second air charging valve, a second pressure sensor, a second liquid level sensor, a second oil discharge valve and a second oil return one-way valve arranged behind the second oil discharge valve, which are respectively arranged on the second oil return oil collection tank; The vacuum pump device is respectively communicated with the first vacuumizing valve and the second vacuumizing valve through vacuum pipelines and is used for vacuumizing the internal pressure of each of the first oil return oil collecting tank and the second oil return oil collecting tank to a vacuum degree lower than the pressure of the environmental cabin; The control device is electrically connected with the adjusting and monitoring device, the vacuum pump device, the first vacuum oil return device and the second vacuum oil return device respectively, and is configured to control the vacuum pump device, the first vacuum oil return device and the second vacuum oil return device to operate according to preset logic according to data correspondingly collected by the first pressure sensor, the first liquid level sensor, the second pressure sensor and the second liquid level sensor, so that the first oil return oil collection tank and the second oil return oil collection tank alternately enter and discharge oil in a vacuum environment. In one embodiment of the present invention, the oil supply device includes an oil supply tank, an oil supply pump connected to an oil outlet end of the oil supply tank, an overflow valve connected between the oil supply pump and the oil supply tank, and a cooler connected to an oil return end of the oil supply tank, and the cooler is connected to the first oil return check valve and the second oil return check valve, respectively. In one embodiment of the present invention, the regulation monitoring device includes a regulating valve, a flow meter and an oil supply pressure sensor connected in sequence, wherein an oil outlet end of the oil supply pump is connected with the regulating valve, and the oil supply pressure sensor is connected with the transmission device. In one embodiment of the invention, the vacuum pump device comprises a vacuum pump, a ball valve, an air filter and a one-way valve which are sequentially connected, wherein the one-way valve is respectively connected with the first vacuumizing valve and the second vac