Oil supply system working in negative pressure environment and control method thereof

Abstract

The invention relates to an oil supply system working in a negative pressure environment and a control method of the oil supply system. The device comprises an oil supply device, adjusting the monitoring device; the first vacuum oil return device comprises a first oil return and collection tank, a first oil inlet valve, a first vacuumizing valve, a first inflation valve, a first pressure sensor, a first liquid level sensor, a first oil discharge valve, a first oil return one-way valve and a first air source; the second vacuum oil return device comprises a second oil return and collection tank, a second oil inlet valve, a second vacuumizing valve, a second inflation valve, a second pressure sensor, a second liquid level sensor, a second oil discharge valve, a second oil return one-way valve and a second air source; a vacuum pump device; and the control device enables the first oil return and collection tank and the second oil return and collection tank to alternately feed and discharge oil in a vacuum environment. Lubricating oil return under the negative pressure environment can be achieved, and the influence of unsmooth oil return under the negative pressure environment is eliminated.

Description

Technical Field

[0001] This invention relates to the field of aerospace testing technology, and in particular to a fuel supply system and its control method that operate under negative pressure. Background Technology

[0002] When conducting negative pressure environment tests, the control system of an aircraft engine needs to supply oil lubrication to the high-speed transmission equipment in the environmental chamber. Since the transmission equipment itself cannot be absolutely sealed, a negative pressure environment will also be formed inside the transmission equipment. This causes the lubricating oil supplied to the transmission equipment to accumulate inside the equipment and cannot return to the normal pressure oil supply device, affecting the normal operation of the oil supply system.

[0003] Therefore, it is urgent to design a specialized lubrication supply system to meet the requirements of negative pressure environment testing for aero-engine control systems. Summary of the Invention

[0004] Therefore, the present invention provides an oil supply system and its control method that operate under negative pressure, which can realize lubrication oil return under negative pressure and eliminate the impact of poor oil return caused by negative pressure.

[0005] To solve the above-mentioned technical problems, the present invention provides an oil supply system that operates under negative pressure, comprising: An oil supply system is used to supply pressurized lubricating oil to the transmission equipment located in the environmental chamber; A regulating monitoring device is installed between the oil supply device and the transmission equipment to regulate and monitor the flow rate and pressure information of the lubricating oil supplied to the transmission equipment; The first vacuum oil return device includes a first oil return collection tank, a first oil inlet valve, a first vacuum valve, a first air filling valve, a first pressure sensor, a first liquid level sensor, a first oil discharge valve, and a first oil return check valve disposed on the first oil return collection tank. The first air filling valve is connected to a first air source. The second vacuum oil return device includes a second oil return collection tank, a second oil inlet valve, a second vacuum valve, a second air filling valve, a second pressure sensor, a second liquid level sensor, a second oil discharge valve, and a second oil return check valve disposed on the second oil return collection tank; the second air filling valve is connected to a second air source. The vacuum pump device has its vacuum lines connected to the first vacuum valve and the second vacuum valve respectively, and is used to pump the internal pressure of the first return oil collection tank and the second return oil collection tank to a vacuum level lower than the environmental chamber pressure. The control device is electrically connected to the regulating and monitoring device, the vacuum pump device, the first vacuum oil return device, and the second vacuum oil return device, respectively. The control device 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 a preset logic based on the data 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 collection tank and the second oil return collection tank alternately receive and discharge oil in a vacuum environment.

[0006] In one embodiment of the present invention, the oil supply device includes an oil supply tank, an oil supply pump connected to the 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 the oil return end of the oil supply tank. The cooler is connected to the first oil return check valve and the second oil return check valve, respectively.

[0007] In one embodiment of the present invention, the regulating and monitoring device includes a regulating valve, a flow meter and an oil supply pressure sensor connected in sequence, the oil outlet of the oil supply pump is connected to the regulating valve and the oil supply pressure sensor is connected to the transmission device.

[0008] In one embodiment of the present invention, the vacuum pump device includes a vacuum pump, a ball valve, an air filter and a check valve connected in sequence, wherein the check valve is connected to the first vacuum valve and the second vacuum valve respectively. The vacuum pump's vacuuming capacity is not lower than the vacuum level required by the environmental chamber, and the time taken to pump from a gauge pressure of 0.3 MPa to a vacuum level lower than that required by the environmental chamber is not less than 80% of the time it takes for the liquid levels in the first and second return oil collection tanks to rise to their respective upper limits for oil discharge.

[0009] In one embodiment of the present invention, both the first return oil collection tank and the second return oil collection tank are cylindrical metal oil tanks, and each can withstand a negative pressure of not less than 0.1 MPa and a positive pressure of not less than 0.5 MPa.

[0010] In one embodiment of the present invention, the oil inlets of the first return oil collection tank and the second return oil collection tank are located at a position of more than three-quarters of the effective height of their respective oil tanks, and the oil outlets are located on the bottom sidewall of their respective oil tanks.

[0011] In one embodiment of the present invention, the first pressure sensor and the first liquid level sensor are both installed on the top of the first return oil collection tank. The first pressure sensor monitors the air pressure inside the first return oil collection tank in real time, and the effective detection length of the first liquid level sensor is greater than four-fifths of the total height inside the first return oil collection tank, so as to monitor the change of liquid level inside the first return oil collection tank in real time. The first drain valve is installed on the bottom side wall of the first return oil collection tank, and the first air valve, the first oil inlet valve, and the first vacuum valve are all installed on the top of the first return oil collection tank.

[0012] In one embodiment of the present invention, the second pressure sensor and the second liquid level sensor are both installed on the top of the second return oil collection tank. The second pressure sensor monitors the air pressure inside the second return oil collection tank in real time, and the effective detection length of the second liquid level sensor is greater than four-fifths of the total height inside the second return oil collection tank, so as to monitor the change of liquid level inside the second return oil collection tank in real time. The second drain valve is installed on the bottom side wall of the second return oil collection tank, and the second air valve, the second oil inlet valve, and the second vacuum valve are all installed on the top of the second return oil collection tank.

[0013] In one embodiment of the present invention, the first drain valve, the first inlet valve, the first inflation valve, the first vacuum valve, the second drain valve, the second inlet valve, the second inflation valve, and the second vacuum valve are all pneumatic ball valves with valve position indicators that can be remotely controlled to open and close.

[0014] The present invention also provides a control method for an oil supply system operating under negative pressure, wherein the control method, based on the oil supply system, includes: S1. Initial vacuuming: Control the closure of the first oil drain valve, the second oil drain valve, the first air filling valve, the second air filling valve, the first oil inlet valve, and the second oil inlet valve; control the opening of the first vacuuming valve and the second vacuuming valve; and start the vacuum pump device to simultaneously pump the internal pressure of the first return oil collection tank and the second return oil collection tank to a set vacuum level lower than the ambient air pressure. S2, Oil Supply: Controls the start of the oil supply device to provide lubricating oil to the transmission equipment, and adjusts and monitors the flow and pressure information of the lubricating oil in real time through the adjustment and monitoring device; S3, First Switching and Oil Discharge: Control the opening of the first oil inlet valve. When the first liquid level sensor detects that the liquid level in the first return oil collection tank reaches the preset upper limit, control the closing of the first oil inlet valve, the opening of the second oil inlet valve, the closing of the first vacuum valve, and the opening of the first oil discharge valve and the first air filling valve when the first pressure sensor detects that the pressure in the first return oil collection tank meets the oil discharge threshold, so that the first return oil collection tank begins to discharge oil. S4. First Vacuuming: When the liquid level in the first return oil collection tank reaches the preset lower limit, close the first air valve, close the first oil drain valve, and reopen the first vacuuming valve to vacuum the first return oil collection tank again for later use. S5. Second switching and oil draining: When the second liquid level sensor detects that the liquid level in the second return oil collection tank has reached the preset upper limit, the second oil inlet valve is closed, the first oil inlet valve is opened, the second vacuum valve is closed, and when the second pressure sensor detects that the pressure in the second return oil collection tank meets the oil draining threshold, the second oil draining valve and the second air filling valve are opened to start draining oil from the second return oil collection tank. S6. Second Vacuuming: When the second liquid level sensor detects that the liquid level in the second return oil collection tank has dropped to the preset lower limit, the second air charging valve and the second oil drain valve are closed, and the second vacuuming valve is reopened to vacuum the second return oil collection tank again. S7. Cycle: The control device executes steps S2 to S6 in a cycle based on the real-time data from the first pressure sensor, the first liquid level sensor, the second pressure sensor, and the second liquid level sensor, so that the first return oil collection tank and the second return oil collection tank alternately receive and discharge oil in a vacuum environment.

[0015] The technical solution of the present invention has the following advantages compared with the prior art: This invention discloses an oil supply system and its control method operating under negative pressure. By incorporating a first vacuum oil return device and a second vacuum oil return device into the oil supply system, and coordinating with a vacuum pump and control device to achieve alternating operation, the system can still achieve continuous and stable lubrication oil return under negative pressure, effectively overcoming the problem of poor oil return caused by negative pressure in the environmental chamber in existing technologies. The parallel structure design of the first and second oil return collection tanks, coordinated by the control device, allows them to alternately receive and discharge oil under vacuum. When one oil return collection tank receives oil, the other oil return collection tank simultaneously discharges oil and re-vacuums, preparing for the next round of oil reception, thereby achieving continuous lubrication oil return, ensuring the synchronicity of oil supply and return during the test, and improving the stability and reliability of system operation. Attached Figure Description

[0016] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is an overall structural diagram of the oil supply system of the present invention operating under negative pressure.

[0018] Explanation of reference numerals on the accompanying drawings: 100. Fuel supply device; 1-0. Fuel tank; 1-1. Fuel pump; 1-2. Overflow valve; 1-3. Cooler; 200. Regulating and monitoring device; 2-1. Regulating valve; 2-2. Flow meter; 2-3. Oil supply pressure sensor; 300. Vacuum pump unit; 3-1. Vacuum pump; 3-2. Ball valve; 3-3. Air filter; 3-4. Check valve; 400. First vacuum oil return device; 4-1. First oil drain valve; 4-2. First oil return collection tank; 4-3. First air charging valve; 4-4. First pressure sensor; 4-5. First liquid level sensor; 4-6. First oil inlet valve; 4-7. First vacuum valve; 4-8. First air source; 4-9. First oil return check valve; 500. Second vacuum oil return device; 5-1. Second oil drain valve; 5-2. Second oil return collection tank; 5-3. Second air charging valve; 5-4. Second pressure sensor; 5-5. Second liquid level sensor; 5-6. Second oil inlet valve; 5-7. Second vacuum valve; 5-8. Second air source; 5-9. Second oil return check valve; 600. Control device. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0020] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0021] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0023] Example 1 Reference Figure 1As shown, an oil supply system operating under negative pressure in this embodiment includes: The oil supply device 100 is used to supply pressurized lubricating oil to the transmission equipment located in the environmental chamber (at a pressure of 0.003~0.2MPa); A regulating monitoring device 200 is installed between the oil supply device 100 and the transmission equipment to regulate and monitor the flow rate and pressure information of the lubricating oil supplied to the transmission equipment. The first vacuum oil return device 400 includes a first oil return collection tank 4-2, a first oil inlet valve 4-6, a first vacuum valve 4-7, a first air filling 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 disposed after the first oil discharge valve 4-1. The first air filling valve 4-3 is connected to a first air source 4-8. The second vacuum oil return device 500 includes a second oil return collection tank 5-2, a second oil inlet valve 5-6, a second vacuum valve 5-7, a second air filling valve 5-3, a second pressure sensor 5-4, a second liquid level sensor 5-5, a second oil drain valve 5-1, and a second oil return check valve 5-9 disposed on the second oil drain valve 5-1; the second air filling valve 5-3 is connected to a second air source 5-8; the first air source 4-8 and the second air source 5-8 can be the same air source; The vacuum pump device 300 has its vacuum lines connected to the first vacuum valve 4-7 and the second vacuum valve 5-7 respectively, and is used to pump the internal pressure of the first return oil collection tank 4-2 and the second return oil collection tank 5-2 to a vacuum level lower than the environmental chamber pressure. The control device 600 is electrically connected to the adjustment and monitoring device 200, the vacuum pump device 300, the first vacuum oil return device 400, and the second vacuum oil return device 500, respectively. 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 a preset logic based on the data collected 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 collection tank 4-2 and the second oil return collection tank 5-2 alternately receive and discharge oil in a vacuum environment.

[0024] By incorporating a first vacuum oil return device 400 and a second vacuum oil return device 500 into the oil supply system, and coordinating with a vacuum pump device 300 and a control device 600 to achieve alternating operation, the system can achieve continuous and stable lubrication oil return even under negative pressure, effectively overcoming the problem of poor oil return caused by negative pressure in the environmental chamber in existing technologies. The parallel structure design of the first return oil collection tank 4-2 and the second return oil collection tank 5-2, under the control of the control device 600, allows them to alternately receive and discharge oil under vacuum. When one return oil collection tank receives oil, the other simultaneously discharges oil and re-vacuums, preparing for the next round of oil intake, thus achieving continuous lubrication oil return, ensuring the synchronization of oil supply and return during the test, and improving the stability and reliability of the system operation.

[0025] Specifically, the oil supply device 100 includes an oil supply pump 1-1 connected to the 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 the oil return end of the oil supply tank 1-0. The cooler 1-3 is connected to the first oil return check valve 4-9 and the second oil return check valve 5-9, respectively.

[0026] A pressure-stabilizing circuit is formed through the overflow valve 1-2, and the cooler 1-3 is used to cool the return oil before it enters the oil supply tank 1-0, thus realizing a closed-loop circulation of oil supply and return.

[0027] Specifically, the regulating and monitoring device 200 includes a regulating valve 2-1, a flow meter 2-2, and an oil supply pressure sensor 2-3 connected in sequence. The oil outlet of the oil supply pump 1-1 is connected to the regulating valve 2-1, and the oil supply pressure sensor 2-3 is connected to the transmission device.

[0028] The regulating valve 2-1, flow meter 2-2 and oil supply pressure sensor 2-3 in the regulating monitoring device 200 can monitor and adjust the oil supply flow and pressure in real time, ensuring that the lubrication state of the transmission equipment in the negative pressure chamber is within the optimal range, and avoiding oil supply interruption or oversupply caused by oil pressure fluctuations.

[0029] Specifically, the vacuum pump device 300 includes a vacuum pump 3-1, a ball valve 3-2, an air filter 3-3, and a one-way valve 3-4 connected in sequence. The one-way valve 3-4 is connected to the first vacuum valve 4-7 and the second vacuum valve 5-7 respectively. The vacuum pump 3-1 has a vacuuming capacity no less than the vacuum level required by the environmental chamber, and the time required to pump from a gauge pressure of 0.3 MPa to a vacuum level lower than the required vacuum level of the environmental chamber is no less than 80% of the time it takes for the liquid levels in the first return oil collection tank 4-2 and the second return oil collection tank 5-2 to rise to their respective upper limits for oil discharge. This ensures a coordinated match between the vacuuming efficiency and the return oil cycle, guaranteeing the dynamic stability of the vacuum environment.

[0030] Specifically, the first return oil collection tank 4-2 and the second return oil collection tank 5-2 are both cylindrical metal oil tanks, and each can withstand a negative pressure of not less than 0.1MPa and a positive pressure of not less than 0.5MPa.

[0031] Specifically, the oil inlets of the first return oil collection tank 4-2 and the second return oil collection tank 5-2 are located at more than three-quarters of the effective height of their respective tanks, with sufficient air chambers at the top to facilitate oil-gas buffering and separation; the oil outlets are located on the bottom sidewalls of their respective tanks, and together with the first return oil check valve 4-9 and the second return oil check valve 5-9, the bottom oil can be drained and backflow prevented, reducing oil retention and secondary pollution.

[0032] Specifically, the first pressure sensor 4-4 and the first liquid level sensor 4-5 are both installed on the top of the first return oil collection tank 4-2. The first pressure sensor 4-4 monitors the air pressure inside the first return oil collection 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 return oil collection tank 4-2, so as to monitor the changes in the liquid level inside the first return oil collection tank 4-2 in real time. Combined with the first pressure sensor 4-4 arranged on the top, the upper and lower limits can be detected over a longer range. The first drain valve 4-1 is installed on the bottom side wall of the first return oil collection tank 4-2, and the first air filling valve 4-3, the first oil inlet valve 4-6, and the first vacuum valve 4-7 are all installed on the top of the first return oil collection tank 4-2.

[0033] Specifically, the second pressure sensor 5-4 and the second liquid level sensor 5-5 are both installed on the top of the second return oil collection tank 5-2. The second pressure sensor 5-4 monitors the air pressure inside the second 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 return oil collection tank 5-2, so as to monitor the changes in the liquid level inside the second return oil collection tank 5-2 in real time. Combined with the second pressure sensor 5-4 arranged on the top, the upper and lower limits can be detected over a longer range. The second drain valve 5-1 is installed on the bottom side wall of the second return oil collection tank 5-2, and the second air charging valve 5-3, the second oil inlet valve 5-6, and the second vacuum valve 5-7 are all installed on the top of the second return oil collection tank 5-2.

[0034] Specifically, the first drain valve 4-1, the first inlet valve 4-6, the first air charging valve 4-3, the first vacuum valve 4-7, the second drain valve 5-1, the second inlet valve 5-6, the second air charging valve 5-3, and the second vacuum valve 5-7 are all pneumatic ball valves with valve position indicators that can be remotely controlled to open and close. In this embodiment, the control device 600 adopts a PLC controller.

[0035] Example 2 This embodiment provides a control method for an oil supply system operating under negative pressure. Based on the oil supply system, the control method includes: S1. Initial vacuuming: Control the closure of the first oil drain valve 4-1, the second oil drain valve 5-1, the first air filling valve 4-3, the second air filling valve 5-3, the first oil inlet valve 4-6, and the second oil inlet valve 5-6; control the opening of the first vacuuming valve 4-7 and the second vacuuming valve 5-7; and start the vacuum pump device 300 to simultaneously pump the internal pressure of the first return oil collection tank 4-2 and the second return oil collection tank 5-2 to a set vacuum level lower than the ambient air pressure. S2, Oil supply: Control the start of the oil supply device 100 to supply lubricating oil to the transmission equipment, and adjust and monitor the flow and pressure information of the lubricating oil in real time through the adjustment and monitoring device 200. S3, First Switching and Oil Discharge: Control the opening of the first oil inlet valve 4-6. When the first liquid level sensor 4-5 detects that the liquid level of the first return oil collection tank 4-2 reaches the preset upper limit, control the closing of the first oil inlet valve 4-6, the opening of the second oil inlet valve 5-6, the closing of the first vacuum valve 4-7, and the opening of the first oil discharge valve 4-1 and the first air filling valve 4-3 when the first pressure sensor 4-4 detects that the pressure of the first return oil collection tank 4-2 meets the oil discharge threshold, so that the first return oil collection tank 4-2 starts to discharge oil. S4. First Vacuuming: When the liquid level in the first return oil collection tank 4-2 reaches the preset lower limit, close the first air charging valve 4-3, close the first oil drain valve 4-1, and reopen the first vacuuming valve 4-7 to vacuum the first return oil collection tank 4-2 again for standby. S5. Second Switching and Oil Discharge: When the second liquid level sensor 5-5 detects that the liquid level in the second return oil collection tank 5-2 has reached the preset upper limit, the second oil inlet valve 5-6 is closed, the first oil inlet valve 4-6 is opened, the second vacuum valve 5-7 is closed, and when the second pressure sensor 5-4 detects that the pressure inside the second return oil collection tank 5-2 meets the oil discharge threshold, the second oil discharge valve 5-1 and the second air filling valve 5-3 are opened to start discharging oil from the second return oil collection tank 5-2. S6. Second vacuuming: When the second liquid level sensor 5-5 detects that the liquid level in the second return oil collection tank 5-2 has dropped to the preset lower limit, the second air charging valve 5-3 and the second oil drain valve 5-1 are closed, and the second vacuuming valve 5-7 is reopened to vacuum the second return oil collection tank 5-2 again. S7. Cycle: The control device 6006 executes steps S2 to S6 in a cycle based on the real-time data from 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 return oil collection tank 4-2 and the second return oil collection tank 5-2 alternately receive and discharge oil in a vacuum environment.

[0036] By connecting the first return oil collection tank 4-2 and the second return oil collection tank 5-2 in parallel, and coordinating the alternating control of the first oil inlet valve 4-6, the second oil inlet valve 5-6, the first oil outlet valve 4-1, and the second oil outlet valve 5-1, one oil tank receives oil while the other discharges oil and re-vacuums, thus avoiding the problem of not being able to receive oil during the oil discharge period. This ensures continuous lubrication and oil return throughout the entire environmental chamber test, improving test efficiency.

[0037] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0038] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0039] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0040] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0041] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An oil supply system operating under negative pressure, characterized in that, include: The oil supply device (100) is used to supply pressurized lubricating oil to the transmission equipment located in the environmental chamber; A regulating monitoring device (200) is installed between the oil supply device (100) and the transmission equipment to regulate and monitor the flow rate and pressure information of the lubricating oil supplied to the transmission equipment; The first vacuum oil return device (400) includes a first oil return collection tank (4-2), a first oil inlet valve (4-6), a first vacuum valve (4-7), a first air filling 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) disposed on the first oil discharge valve (4-1). The first air filling valve (4-3) is connected to a first air source (4-8). The second vacuum oil return device (500) includes a second oil return collection tank (5-2), a second oil inlet valve (5-6), a second vacuum valve (5-7), a second air filling valve (5-3), a second pressure sensor (5-4), a second liquid level sensor (5-5), a second oil drain valve (5-1), and a second oil return check valve (5-9) disposed on the second oil drain valve (5-1); the second air filling valve (5-3) is connected to a second air source (5-8); The vacuum pump device (300) has its vacuum lines connected to the first vacuum valve (4-7) and the second vacuum valve (5-7) respectively, and is used to pump the internal pressure of the first return oil collection tank (4-2) and the second return oil collection tank (5-2) to a vacuum level lower than that of the environmental chamber. The control device (600) is electrically connected to the regulating and monitoring device (200), the vacuum pump device (300), the first vacuum oil return device (400), and the second vacuum oil return device (500), respectively. 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 a preset logic based on the data collected 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 collection tank (4-2) and the second oil return collection tank (5-2) alternately receive and discharge oil in a vacuum environment.

2. The oil supply system operating under negative pressure environment according to claim 1, characterized in that, The oil supply device (100) includes an oil supply tank (1-0), an oil supply pump (1-1) connected to the oil outlet 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 the oil return end of the oil supply tank (1-0). The cooler (1-3) is connected to the first oil return check valve (4-9) and the second oil return check valve (5-9) respectively.

3. The oil supply system operating under negative pressure environment according to claim 2, characterized in that, The regulating and monitoring device (200) includes a regulating valve (2-1), a flow meter (2-2), and an oil supply pressure sensor (2-3) connected in sequence. The oil outlet of the oil supply pump (1-1) is connected to the regulating valve (2-1), and the oil supply pressure sensor (2-3) is connected to the transmission device.

4. The oil supply system operating under negative pressure environment according to claim 1, characterized in that, The vacuum pump device (300) includes a vacuum pump (3-1), a ball valve (3-2), an air filter (3-3), and a check valve (3-4) connected in sequence. The check valve (3-4) is connected to the first vacuum valve (4-7) and the second vacuum valve (5-7) respectively. The vacuum pump (3-1) has a vacuuming capacity that is not lower than the vacuum level required by the environmental chamber, and the time taken to pump from a gauge pressure of 0.3 MPa to a vacuum level lower than that required by the environmental chamber is not less than 80% of the time it takes for the liquid levels of the first return oil collection tank (4-2) and the second return oil collection tank (5-2) to rise to their respective upper limits for oil discharge.

5. The oil supply system operating under negative pressure environment according to claim 1, characterized in that, Both the first return oil collection tank (4-2) and the second return oil collection tank (5-2) are cylindrical metal oil tanks, and each can withstand a negative pressure of not less than 0.1MPa and a positive pressure of not less than 0.5MPa.

6. The oil supply system operating under negative pressure environment according to claim 1, characterized in that, The oil inlets of the first return oil collection tank (4-2) and the second return oil collection tank (5-2) are located at more than three-quarters of the effective height of their respective oil tanks, and the oil outlets are located on the bottom side wall of their respective oil tanks.

7. The oil supply system operating under 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 on the top of the first return oil collection tank (4-2). The first pressure sensor (4-4) monitors the air pressure inside the first return oil collection tank (4-2) in real time. The effective detection length of the first liquid level sensor (4-5) is greater than four-fifths of the total height inside the first return oil collection tank (4-2) to monitor the liquid level change inside the first return oil collection tank (4-2) in real time. The first drain valve (4-1) is installed on the bottom side wall of the first return oil collection tank (4-2), and the first air valve (4-3), the first oil inlet valve (4-6), and the first vacuum valve (4-7) are all installed on the top of the first return oil collection tank (4-2).

8. The oil supply system operating under 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 on the top of the second return oil collection tank (5-2). The second pressure sensor (5-4) monitors the air pressure inside the second return oil collection tank (5-2) in real time. The effective detection length of the second liquid level sensor (5-5) is greater than four-fifths of the total height inside the second return oil collection tank (5-2) to monitor the changes in the liquid level inside the second return oil collection tank (5-2) in real time. The second drain valve (5-1) is installed on the bottom side wall of the second return oil collection tank (5-2), and the second air valve (5-3), the second oil inlet valve (5-6), and the second vacuum valve (5-7) are all installed on the top of the second return oil collection tank (5-2).

9. The oil supply system operating under negative pressure environment according to claim 1, characterized in that, The first drain valve (4-1), the first inlet valve (4-6), the first air filling valve (4-3), the first vacuum valve (4-7), the second drain valve (5-1), the second inlet valve (5-6), the second air filling valve (5-3), and the second vacuum valve (5-7) are all pneumatic ball valves with valve position indicators that can be remotely controlled to open and close.

10. A control method for an oil supply system operating under negative pressure, characterized in that, Based on the oil supply system according to any one of claims 1-9, the control method includes: S1. Initial vacuuming: Control the closure of the first oil drain valve (4-1), the second oil drain valve (5-1), the first air filling valve (4-3), the second air filling valve (5-3), the first oil inlet valve (4-6), and the second oil inlet valve (5-6), control the opening of the first vacuum valve (4-7) and the second vacuum valve (5-7), and start the vacuum pump device (300) to simultaneously evacuate the internal pressure of the first return oil collection tank (4-2) and the second return oil collection tank (5-2) to a set vacuum level lower than the ambient chamber pressure; S2, Oil supply: Control the start of the oil supply device (100) to supply lubricating oil to the transmission equipment, and adjust and monitor the flow and pressure information of the lubricating oil in real time through the adjustment and monitoring device (200); S3, First Switching and Oil Discharge: Control the opening of the first oil inlet valve (4-6). When the first liquid level sensor (4-5) detects that the liquid level in the first return oil collection tank (4-2) has reached the preset upper limit, control the closing of the first oil inlet valve (4-6), opening of the second oil inlet valve (5-6), closing of the first vacuum valve (4-7), and under the condition that the pressure of the first return oil collection tank (4-2) meets the oil discharge threshold detected by the first pressure sensor (4-4), opening of the first oil discharge valve (4-1) and the first air filling valve (4-3) to start discharging oil from the first return oil collection tank (4-2); S4. First Vacuum Re-vacuuming: When the liquid level in the first return oil collection tank (4-2) reaches the preset lower limit, close the first air charging valve (4-3), close the first oil drain valve (4-1), and reopen the first vacuum valve (4-7) to vacuum the first return oil collection tank (4-2) again for standby. S5. Second Switching and Oil Discharge: When the second liquid level sensor (5-5) detects that the liquid level in the second return oil collection tank (5-2) has reached the preset upper limit, the second oil inlet valve (5-6) is closed, the first oil inlet valve (4-6) is opened, the second vacuum valve (5-7) is closed, and when the second pressure sensor (5-4) detects that the pressure in the second return oil collection tank (5-2) meets the oil discharge threshold, the second oil discharge valve (5-1) and the second air filling valve (5-3) are opened to start discharging oil from the second return oil collection tank (5-2). S6, Second Vacuuming: When the second liquid level sensor (5-5) detects that the liquid level in the second return oil collection tank (5-2) has dropped to the preset lower limit, the second air charging valve (5-3) and the second oil drain valve (5-1) are closed, and the second vacuuming valve (5-7) is reopened to vacuum the second return oil collection tank (5-2) again. S7. Cycle: The control device (600) (6) executes steps S2 to S6 in a cycle 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 return oil collection tank (4-2) and the second return oil collection tank (5-2) alternately receive and discharge oil in a vacuum environment.

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