An oil exhaust apparatus and method for a self-pressurized hydraulic oil tank system

Abstract

This application provides an oil venting device and method for a self-pressurizing hydraulic tank system, including an on-board oil suction device, an oil treatment device, an oil-gas separator, an oil return device, a control panel, a system bracket, a power interface, and wheels. The oil treatment device, oil return device, control panel, and power interface are fixed to the system bracket; the wheels are fixed to the bottom of the system bracket for equipment movement; the oil suction device and oil return device are connected to the oil treatment device; and the oil-gas separator is fixed to the top of the oil treatment device to separate gases escaping from the oil. This application can remove extremely small air bubbles and dissolved gases that remain in the hydraulic system oil after traditional venting processes, achieving deep venting of the system oil and ensuring the safe and stable operation of the hydraulic system.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of helicopter hydraulic system maintenance, and particularly to an oil venting device and method for a self-pressurized hydraulic oil tank system. Background Technology

[0002] Air mixed into a hydraulic system can cause problems such as cavitation, oil deterioration, high-frequency vibration of the system, and loss of precision of moving parts. This can further damage precision components or cause seal failure, posing a threat to flight safety. Self-pressurized hydraulic tanks are generally suitable for hydraulic systems operating in high-altitude / high-pressure conditions and have oil-gas isolation capabilities. Under normal operating conditions, there should be no gas in the system. However, general venting only removes large air bubbles in the system oil by draining oil, and cannot effectively remove air bubbles with a diameter of less than 0.05 mm or gas dissolved in the oil. Summary of the Invention

[0003] This invention provides an oil venting device and method for a self-pressurized hydraulic oil tank system, which solves the problem that air bubbles with a diameter of less than 0.05 mm and gases dissolved in the oil cannot be effectively removed.

[0004] The technical solution of this invention is as follows:

[0005] An oil venting device for a self-pressurizing hydraulic oil tank system includes an on-board oil suction device 1, an oil treatment device 2, an oil-gas separator 3, an oil return device 4, a control panel 5, a system bracket 6, a power interface 7, and wheels 8, wherein:

[0006] The oil treatment device 2, oil return device 4, control panel 5 and power interface 7 are fixed on the system bracket 6; wheels 8 are fixed to the bottom of the system bracket 6 for equipment movement; the on-machine oil suction device 1 and oil return device 4 are connected to the oil treatment device 2; the oil-gas separation device 3 is fixed on the top of the oil treatment device 2 for separating the gas escaping from the oil.

[0007] Specifically, the onboard oil suction device 1 includes an onboard oil suction pipe self-sealing connector 121, a two-position two-way shut-off valve 120, and an oil suction pipe 119, which are used to transfer hydraulic oil from the onboard hydraulic system and the self-pressurized hydraulic oil tank to the oil treatment device 2; wherein, the onboard oil suction pipe self-sealing connector 121 is used to connect the onboard ground pressure oil suction port 201 to the two-position two-way shut-off valve 120, and then connect to the oil treatment device 2 through the oil suction pipe 119.

[0008] Specifically, the oil treatment device 2 includes an electric heater 101 with temperature control, an oil treatment chamber 102, a low-level liquid level signal 109, and an ultrasonic generator 118. The oil treatment chamber 102 is connected to the oil suction line 119 and the oil filling line 117. The ultrasonic generator 118 is fixed on the system bracket 6, and the oil treatment chamber 102 is fixed above the ultrasonic generator 118 to accelerate the escape of air bubbles in the hydraulic oil and their entry into the upper oil-gas separation device 3. The electric heater 101 with temperature control is installed on the surface of the oil treatment chamber 102 to heat the hydraulic oil, and the low-level liquid level signal 109 is installed at the bottom to monitor the liquid level in the oil treatment chamber 102. The liquid level trigger position of the low-level liquid level signal 109 should be 5 cm above the connection interface between the oil filling line 117 and the oil treatment chamber 102.

[0009] Specifically, the oil-gas separation device 3 includes a connecting pipe 103, a high-level liquid level signal 104, a pressure switch 105, a two-position two-way shut-off valve 106, a vacuum pump 107, and a gas-liquid separation chamber 108. The gas-liquid separation chamber 108 is a 1L volume chamber container with 90° conical openings at the top and bottom and a cylindrical center. A high-level liquid level signal 104 is also installed on the gas-liquid separation chamber 108, and the liquid level trigger position of the high-level liquid level signal 104 should be 5cm above the conical opening at the bottom of the gas-liquid separation chamber 108. The upper part of the gas-liquid separation chamber 108 is also connected to the pressure switch 105, the two-position two-way shut-off valve 106, and the vacuum pump 107. The vacuum pump 107 is used to reduce the pressure in the gas-liquid separation chamber 108 and the oil processing chamber 102 when connected. The two-position two-way shut-off valve 106 is used to control the connection between the gas-liquid separation chamber 108 and the atmospheric environment.

[0010] Specifically, the oil return device 4 includes an onboard refueling line self-sealing connector 110, an accumulator 111, an accumulator safety valve 112, an electric pump check valve 113, an electric pump 114, an oil filter 115, a two-position two-way shut-off valve 116, and a refueling line 117. The electric pump 114 draws in vented hydraulic oil from the oil treatment chamber 102 through the refueling line 117, the two-position two-way shut-off valve 116, and the oil filter 115, and sends it into the accumulator 111. The vented oil is then returned to the onboard hydraulic system and oil tank by connecting to the onboard ground pressure refueling port 202 through the onboard refueling line self-sealing connector 110. The accumulator safety valve 112 connects the accumulator 111 and the refueling line 117, providing a pressure relief path when the accumulator 111 is overpressurized.

[0011] Specifically, the control panel 5 is equipped with a main power switch 301, a working mode knob 302, a working status knob 303, a heating temperature setting knob 304, and a set temperature / current temperature display 305. The working mode knob 302 has two settings: automatic and manual. Each setting has a corresponding green indicator light 306. When the corresponding setting is switched, the green light illuminates. The working status knob 303 has four settings: off, oil suction, exhaust, and refueling. The off setting corresponds to a red indicator light 307. Each of the oil suction, exhaust, and refueling settings has a yellow-green dual-color indicator light 308. When the corresponding setting is switched, the yellow light illuminates, and the green light illuminates when the working state is achieved.

[0012] Furthermore, the oil treatment chamber 102 is a chamber container with a 90° conical top with an opening, a cylindrical bottom, and an inclined bottom. It has a volume of 5L. The conical top opening is a flange with a seal for connecting to the gas-liquid separation chamber 108. The lower inclined surface has a height difference of 5cm for storing and treating hydraulic oil sucked in from the ground-based pressure suction port 201. The high point of the lower inclined surface is the oil suction pipe 119 interface, and the low point is the refueling pipe 117 interface. The oil treatment chamber 102 is made of transparent, oil-resistant plexiglass.

[0013] Furthermore, the gas-liquid separation chamber 108 is a chamber container with a 90° conical opening at the top and bottom and a cylindrical shape in the middle, with a volume of 1L. The conical openings at the top and bottom are flanges with sealing elements, which are used to connect the connecting pipe 103, the oil treatment chamber 102 and the vacuum pump 107. The gas-liquid separation chamber 108 is made of transparent oil-resistant plexiglass.

[0014] Furthermore, the vacuum pump 107 is driven by 28V DC power, and the ultimate vacuum level is less than 1000Pa. The pressure switch 105 is used to control the start and stop of the vacuum pump 107.

[0015] Furthermore, the electric pump 114 is driven by 28V DC power, with an output pressure of 4MPa. Its start-up is controlled by the control panel 5, and its stop-up is controlled by the low liquid level signal 109.

[0016] This invention provides an oil venting device and method for a self-pressurized hydraulic oil tank system. It separates and removes air bubbles (less than 0.05 mm in diameter) and dissolved gases from the oil in the system. By separately depressurizing and heating the system oil, the solubility of gases in the oil is reduced, causing air bubbles to escape. Simultaneously, ultrasonic vibration is used to rapidly rise and break these small bubbles, achieving deep venting of the oil. The beneficial effects of this application are: it can further remove extremely small air bubbles (less than 0.05 mm in diameter) and dissolved gases that remain in the hydraulic system oil after traditional venting methods, achieving deep venting of the system oil. This avoids problems such as cavitation, oil deterioration, high-frequency vibration of the system, loss of precision of moving parts, and seal failure, ensuring the safe and stable operation of the hydraulic system. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0018] Figure 1 A schematic diagram of the structure of an oil venting device for a self-pressurizing hydraulic oil tank system provided in this application;

[0019] Figure 2 A schematic diagram of an oil venting device for a self-pressurized hydraulic oil tank system provided in this application;

[0020] Figure 3 This is a schematic diagram of the onboard interface provided by the present invention;

[0021] Figure 4 This is a schematic diagram of the control panel provided by the present invention;

[0022] Among them, 1-on-machine oil suction device, 2-oil treatment device, 3-oil-gas separator, 4-oil return device, 5-control panel, 6-system bracket, 7-power interface, 8-wheel, 101-electric heater with temperature control, 102-oil treatment chamber, 103-connecting pipe, 104-high liquid level signal, 105-pressure switch, 106-two-position two-way shut-off valve, 107-vacuum pump, 108-gas-liquid separation chamber, 109-low liquid level signal, 110-on-machine refueling pipeline self-sealing connector, 111-accumulator, 112-accumulator safety valve, 113-electric pump check valve 114-Electric pump, 115-Oil filter, 116-Two-position two-way shut-off valve, 117-Refueling pipeline, 118-Ultrasonic generator, 119-Oil suction pipeline, 120-Two-position two-way shut-off valve, 121-Self-sealing connector for on-board oil suction pipeline; 201-On-board ground pressure oil suction port, 202-On-board ground pressure refueling port; 301-Main power switch, 302-Working mode knob, 303-Working status knob, 304-Heating temperature setting knob, 305-Set temperature / current temperature display, 306-Green indicator light, 307-Red indicator light, 308-Yellow-green dual-color indicator light. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0024] Example 1

[0025] like Figure 1 As shown, this application provides an oil venting device for a self-pressurizing hydraulic oil tank system, including an on-board oil suction device 1, an oil treatment device 2, an oil-gas separator 3, an oil return device 4, a control panel 5, a system bracket 6, a power interface 7, and wheels 8, wherein:

[0026] The oil treatment device 2, oil return device 4, control panel 5 and power interface 7 are fixed on the system bracket 6; wheels 8 are fixed to the bottom of the system bracket 6 for equipment movement; the on-machine oil suction device 1 and oil return device 4 are connected to the oil treatment device 2; the oil-gas separation device 3 is fixed on the top of the oil treatment device 2 for separating the gas escaping from the oil.

[0027] Specifically, such as Figure 2As shown: The onboard oil suction device 1 includes an onboard oil suction pipe self-sealing connector 121, a two-position two-way shut-off valve 120, and an oil suction pipe 119, which is used to transfer hydraulic oil from the onboard hydraulic system and the self-pressurized hydraulic oil tank to the oil treatment device 2; wherein, the onboard oil suction pipe self-sealing connector 121 is used to connect the onboard ground pressure oil suction port 201 to the two-position two-way shut-off valve 120, and then connects to the oil treatment device 2 through the oil suction pipe 119.

[0028] Specifically, such as Figure 2 As shown: The oil treatment device 2 includes an electric heater 101 with temperature control, an oil treatment chamber 102, a low-level liquid level signal 109, and an ultrasonic generator 118; wherein, the oil treatment chamber 102 is connected to the oil suction line 119 and the oil filling line 117; the ultrasonic generator 118 is fixed on the system bracket 6, and the oil treatment chamber 102 is fixed above the ultrasonic generator 118 to accelerate the escape of air bubbles in the hydraulic oil and their entry into the upper oil-gas separation device 3; the electric heater 101 with temperature control is installed on the surface of the oil treatment chamber 102 to heat the hydraulic oil, and the low-level liquid level signal 109 is installed at the bottom to monitor the liquid level in the oil treatment chamber 102. The liquid level trigger position of the low-level liquid level signal 109 should be 5cm above the connection interface between the oil filling line 117 and the oil treatment chamber 102.

[0029] Specifically, such as Figure 2 As shown: The oil-gas separation device 3 includes a connecting pipe 103, a high-level liquid level signal 104, a pressure switch 105, a two-position two-way shut-off valve 106, a vacuum pump 107, and a gas-liquid separation chamber 108. The gas-liquid separation chamber 108 is a 1L volume chamber container with 90° conical openings at the top and bottom and a cylindrical shape in the middle. The high-level liquid level signal 104 is also installed on the gas-liquid separation chamber 108. The liquid level trigger position of the high-level liquid level signal 104 should be 5cm above the conical opening at the bottom of the gas-liquid separation chamber 108. The upper part of the gas-liquid separation chamber 108 is also connected to the pressure switch 105, the two-position two-way shut-off valve 106, and the vacuum pump 107. The vacuum pump 107 is used to reduce the pressure in the gas-liquid separation chamber 108 and the oil processing chamber 102 when connected. The two-position two-way shut-off valve 106 is used to control the connection between the gas-liquid separation chamber 108 and the atmospheric environment.

[0030] Specifically, such as Figure 3As shown: The oil return device 4 includes an onboard refueling line self-sealing connector 110, an accumulator 111, an accumulator safety valve 112, an electric pump check valve 113, an electric pump 114, an oil filter 115, a two-position two-way shut-off valve 116, and a refueling line 117. Among them, the electric pump 114 draws in the vented hydraulic oil from the oil treatment chamber 102 through the refueling line 117, the two-position two-way shut-off valve 116, and the oil filter 115, and sends it into the accumulator 111. It then connects to the onboard ground pressure refueling port 202 through the onboard refueling line self-sealing connector 110 to return the vented oil to the onboard hydraulic system and the oil tank. The accumulator safety valve 112 connects the accumulator 111 and the refueling line 117 to provide a pressure relief path when the accumulator 111 is over-pressurized.

[0031] Specifically, such as Figure 4 As shown, the control panel 5 is equipped with a main power switch 301, a working mode knob 302, a working status knob 303, a heating temperature setting knob 304, and a set temperature / current temperature display 305. The working mode knob 302 has two positions: automatic and manual. Each position has a corresponding green indicator light 306. When the corresponding position is switched, the green light illuminates. The working status knob 303 has four positions: off, oil suction, exhaust, and refueling. The off position corresponds to a red indicator light 307. Each of the oil suction, exhaust, and refueling positions has a yellow-green dual-color indicator light 308. When the corresponding position is switched, the yellow light illuminates, and the green light illuminates when the working state is achieved.

[0032] Furthermore, the oil treatment chamber 102 is a chamber container with a 90° conical top with an opening, a cylindrical bottom, and an inclined bottom. It has a volume of 5L. The conical top opening is a flange with a seal for connecting to the gas-liquid separation chamber 108. The lower inclined surface has a height difference of 5cm for storing and treating hydraulic oil sucked in from the ground-based pressure suction port 201. The high point of the lower inclined surface is the oil suction pipe 119 interface, and the low point is the refueling pipe 117 interface. The oil treatment chamber 102 is made of transparent, oil-resistant plexiglass.

[0033] Furthermore, the gas-liquid separation chamber 108 is a chamber container with a 90° conical opening at the top and bottom and a cylindrical shape in the middle, with a volume of 1L. The conical openings at the top and bottom are flanges with sealing elements, which are used to connect the connecting pipe 103, the oil treatment chamber 102 and the vacuum pump 107. The gas-liquid separation chamber 108 is made of transparent oil-resistant plexiglass.

[0034] Furthermore, the vacuum pump 107 is driven by 28V DC power, and the ultimate vacuum level is less than 1000Pa. The pressure switch 105 is used to control the start and stop of the vacuum pump 107.

[0035] Furthermore, the electric pump 114 is driven by 28V DC power, with an output pressure of 4MPa. Its start-up is controlled by the control panel 5, and its stop-up is controlled by the low liquid level signal 109.

[0036] Actual test: The standard group used a sampling bottle to collect 100ml of hydraulic oil from the hydraulic system that had not been vented. After standing in a constant temperature environment of 20℃ for 30 minutes, a sampling needle was used to take a sample from the center of the oil bottle and drop it onto a hemocytometer. The sample was observed using a 400x magnifying microscope, and air bubbles with a diameter of less than 0.05mm in the sample were classified and counted using a graduated eyepiece.

[0037] In control group 1, 100ml of hydraulic oil was collected in a sampling bottle after being heated at 80℃, ultrasonically treated, and vacuumed for 5 minutes (one cycle) using this equipment. After standing in a constant temperature environment of 20℃ for 30 minutes, a sampling needle was used to take a sample from the center of the oil bottle and drop it onto a hemocytometer. The sample was observed using a 400x magnifying microscope, and air bubbles with a diameter of less than 0.05mm in the sample were classified and counted using a graduated eyepiece.

[0038] In control group 2, 100ml of hydraulic oil was collected in a sampling bottle after being heated at 80℃, ultrasonically treated, and vacuumed for 10 minutes (2 cycles) using this equipment. After standing in a constant temperature environment of 20℃ for 30 minutes, a sampling needle was used to take a sample from the center of the oil bottle and drop it onto a hemocytometer. The sample was observed using a 400x magnifying microscope, and air bubbles with a diameter of less than 0.05mm in the sample were classified and counted using a graduated eyepiece.

[0039] In control group 3, 100ml of hydraulic oil was collected in a sampling bottle after being heated at 80℃, ultrasonically treated, and vacuumed for 15 minutes (3 cycles) using this equipment. After standing in a constant temperature environment of 20℃ for 30 minutes, a sampling needle was used to take a sample from the center of the oil bottle and drop it onto a hemocytometer. The sample was observed using a 400x magnifying microscope, and air bubbles with a diameter of less than 0.05mm in the sample were classified and counted using a graduated eyepiece.

[0040] Based on the results of 5 sets of tests, the average number of bubbles with a diameter less than 0.05 mm was: Standard Group: Comparison Group 1: Comparison Group 2: Comparison Group 3 = 157:38:16:7. Therefore, after 3 cycles, the removal rate of bubbles with a diameter less than 0.05 mm in the oil was 95.54%, which is close to the theoretical calculation value.

[0041] Example 2

[0042] This application provides an oil venting device and venting method for a self-pressurizing hydraulic oil tank system, including a manual mode and an automatic mode, wherein:

[0043] Manual mode:

[0044] Connect the equipment to a 28V DC power supply from the power interface 7, connect the self-sealing connector 121 of the oil suction line on the machine to the ground pressure oil suction port 201 on the machine, connect the self-sealing connector 110 of the oil refueling line on the machine to the ground pressure oil refueling port 202 on the machine, set the working mode knob 302 to the manual position on the control panel 5, set the working status knob 303 to the off position, and press the main power switch 301. At this time, the green indicator light 306 illuminates in the manual position and the red indicator light 307 illuminates.

[0045] When the working status knob 303 is set to the oil suction position, the yellow-green dual-color indicator 308 illuminates yellow, the two-position two-way shut-off valve 116 is closed, and the two-position two-way shut-off valves 120 and 106 are open. The oil in the machine system enters the oil treatment chamber 102 through the oil suction pipe 119. As the oil level rises, the oil eventually enters the bottom of the gas-liquid separation chamber 108 and reaches the trigger point of the high-level liquid level signal 104. At this time, the high-level liquid level signal 104 controls the two-position two-way shut-off valves 120 and 106 to close, and the yellow-green dual-color indicator 308 illuminates green, indicating that the oil suction operation is complete.

[0046] Rotate the heating temperature setting knob 304 to set the heating temperature according to the characteristic parameters of the oil grade. Set the working status knob 303 to the exhaust position. At this time, the yellow-green dual-color indicator light 308 illuminates yellow when the exhaust position is active, and the vacuum pump 107 starts working. When the gas pressure in the gas-liquid separation chamber 108 is less than 1500Pa, the pressure switch 105 controls the vacuum pump 107 to stop working and connects the power supply to the temperature-controlled electric heater 101 to heat the hydraulic oil in the oil treatment chamber 102. The set temperature and the current oil temperature can be viewed on the set temperature / current temperature display 305. During this process, small bubbles can be observed escaping from the oil and concentrating in the gas-liquid separation chamber 10. In step 8, if heating causes the oil to boil, the heating temperature setting knob 304 can be adjusted to lower the temperature setting to prevent the oil from boiling. When the oil temperature in the oil treatment chamber 102 reaches the preset value, the ultrasonic generator 118 starts and works for 5 minutes to accelerate the escape and collapse of bubbles in the oil. During this process, as the gas escapes, pressure changes will occur in the gas-liquid separation chamber 108. When the pressure is greater than 3000Pa, the vacuum pump 107 will start under the control of the pressure switch 105 until it stops when the pressure is less than 1500Pa. After the ultrasonic generator 118 works for 5 minutes, it will be powered off, and the yellow-green dual-color indicator light 308 will light up green in the exhaust position, indicating that the exhaust work is complete.

[0047] With the working status knob 303 in the refueling position, the two-position two-way shut-off valve 3 120 is closed, while the two-position two-way shut-off valves 2 116 and 1 106 are opened. The electric pump 114 is powered on and starts working, drawing oil from the oil treatment chamber 102 through the refueling pipeline 117, pressurizing it, and sending it into the accumulator 111 through the check valve 113. Then, through the self-sealing connector 110 of the on-board refueling pipeline and the on-board ground pressure refueling port 202, the vented oil is sent into the on-board hydraulic system. As the oil in the oil treatment chamber 102 is drawn away, the liquid level drops to the trigger point of the low-level liquid level signal 109, the electric pump 114 is de-energized, and the yellow-green dual-color indicator light 308 turns green when refueling, indicating that the refueling work is complete. This completes one work cycle.

[0048] Automatic mode:

[0049] Connect the equipment to a 28V DC power supply at power interface 7. Connect the self-sealing connector 121 of the oil suction line on the machine to the ground pressure oil suction port 201 on the machine. Connect the self-sealing connector 110 of the oil refueling line on the machine to the ground pressure oil refueling port 202 on the machine. On the control panel 5, set the working mode knob 302 to the manual position and the working status knob 303 to the off position. Press the main power switch 301. At this time, the green indicator light 306 in the manual position will light up, and the red indicator light 307 will light up. Set the working mode knob 302 to the automatic position. At this time, the green indicator light 306 in the manual position will turn off, and the automatic position will light up. The equipment will automatically start the working cycle and complete the venting of all oil in the machine system. The number of cycles required is the integer of the total oil volume in the system (in liters) / 5 * 3.

[0050] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. An oil degassing apparatus for a self-pressurized hydraulic tank system, characterized by, This includes an onboard oil suction device, oil treatment device, oil-gas separator, oil return device, control panel, system bracket, and power interface, among which: The oil treatment device, oil return device, control panel and power interface are fixed on the system bracket; the on-machine oil suction device and oil return device are connected to the oil treatment device, and the oil-gas separator is fixed on the top of the oil treatment device. The onboard oil suction device is used to transfer hydraulic oil from the onboard hydraulic system and the self-pressurized hydraulic oil tank to the oil treatment device. The oil treatment device includes an electric heater, an oil treatment chamber, a low-level liquid level signal, and an ultrasonic generator. The oil treatment chamber is connected to the oil suction line and the oil filling line. The ultrasonic generator is fixed on the system bracket, and the oil treatment chamber is fixed above the ultrasonic generator. An electric heater is installed on the surface of the oil treatment chamber, and a low-level liquid level signal is installed at the bottom. The liquid level trigger position of the low-level liquid level signal is above the connection interface between the oil filling line and the oil treatment chamber. The oil-gas separation device includes a high-level liquid level signal, a pressure switch, a two-position two-way shut-off valve, a vacuum pump, and a gas-liquid separation chamber. The high-level liquid level signal is installed on the gas-liquid separation chamber, and the liquid level trigger position of the high-level liquid level signal is on the bottom opening of the gas-liquid separation chamber. The pressure switch, the two-position two-way shut-off valve, and the vacuum pump are connected to the upper part of the gas-liquid separation chamber. The oil return device includes an onboard refueling line self-sealing connector, an accumulator, an accumulator safety valve, an electric pump check valve, an electric pump, an oil filter, a two-position two-way shut-off valve, and a refueling line. The electric pump draws in vented hydraulic oil from the oil treatment chamber through the refueling line, the two-position two-way shut-off valve, and the oil filter, and sends it into the accumulator. The vented oil is then returned to the onboard hydraulic system and oil tank through the onboard refueling line self-sealing connector connected to the onboard ground pressure refueling port. The accumulator safety valve connects the accumulator to the refueling line.

2. The oil venting device according to claim 1, characterized in that, The onboard oil suction device includes an onboard oil suction pipe self-sealing connector, a two-position two-way shut-off valve, and an oil suction pipe. The onboard oil suction pipe self-sealing connector is used to connect the onboard ground pressure oil suction port to the two-position two-way shut-off valve, and then connects to the oil treatment device through the oil suction pipe.

3. The oil venting device according to claim 2, characterized in that, The vacuum pump is used to reduce the pressure in the gas-liquid separation chamber and the oil treatment chamber when connected. The two-position two-way shut-off valve is used to control the connection between the gas-liquid separation chamber and the atmospheric environment.

4. The oil venting device according to claim 1, characterized in that, The control panel features a main power switch, a working mode knob, a working status knob, a heating temperature setting knob, and a display for the set / current temperature. The working mode knob has two settings: automatic and manual. Each setting has a corresponding green indicator light; the green light illuminates when the desired setting is selected. The working status knob has four settings: off, oil suction, oil exhaust, and oil filling. The off setting corresponds to a red indicator light. The oil suction, oil exhaust, and oil filling settings each have a yellow-green indicator light; the yellow light illuminates when the desired setting is selected, and the green light illuminates when the desired working state is achieved.

5. The oil venting device according to claim 3, characterized in that, The oil handling chamber is a container with a 90° conical top with an opening, a cylindrical bottom, and an inclined bottom. The conical top opening has a flange with a seal for connecting to the gas-liquid separation chamber. The lower inclined surface has a height difference for storing and processing hydraulic oil sucked in from the pressurized oil suction port on the ground. The higher point of the lower inclined surface is the oil suction pipe interface, and the lower point is the refueling pipe interface. The entire oil handling chamber is made of transparent, oil-resistant acrylic glass.

6. The oil venting device according to claim 3, characterized in that, The gas-liquid separation chamber is a cylindrical chamber container with conical openings at the top and bottom. The conical openings at the top and bottom are flanges with seals for connecting the connecting pipe, the oil treatment chamber and the vacuum pump. The gas-liquid separation chamber 108 is made of transparent oil-resistant plexiglass.

7. The oil venting device according to claim 3, characterized in that, The vacuum pump is driven by DC electricity, and a pressure switch is used to control the start and stop of the vacuum pump.

8. The oil venting device according to claim 4, characterized in that, The electric pump is driven by DC electricity, and its start-up is controlled by the control panel, while its stop-up is controlled by the low liquid level signal.

9. A method for venting oil in a self-pressurizing hydraulic tank system, characterized in that, The method is implemented using the oil venting device according to any one of claims 1 to 8, and the method includes: Connect a DC power source to the power interface, connect the self-sealing connector of the oil suction line on the machine to the ground pressure oil suction port on the machine, connect the self-sealing connector of the oil refueling line on the machine to the ground pressure oil refueling port on the machine, set the working mode knob to the manual position on the control panel, set the working status knob to the off position, and press the main power switch. At this time, the green indicator light for the manual position will light up, and the red indicator light will light up. Set the operating status knob to the oil suction position. At this time, the yellow-green dual-color indicator light will illuminate yellow when the oil suction position is set. The two-position two-way shut-off valve 2 will be closed, while the two-position two-way shut-off valves 3 and 1 will be opened. The oil in the machine system will enter the oil processing chamber through the oil suction pipe. As the oil level rises, the oil will eventually enter the bottom of the gas-liquid separation chamber and reach the trigger point of the high-level liquid level signal. At this time, the high-level liquid level signal will control the two-position two-way shut-off valves 3 and 1 to close, and the yellow-green dual-color indicator light will illuminate green when the oil suction position is set. The oil suction operation is now complete.

10. The exhaust method according to claim 9, characterized in that, The method also includes: Rotate the heating temperature setting knob to set the heating temperature according to the characteristic parameters of the oil grade. Set the working status knob to the exhaust position; at this time, the yellow-green dual-color indicator light will illuminate yellow, indicating the vacuum pump has started working. When the gas pressure in the gas-liquid separation chamber is less than 1500Pa, the pressure switch controls the vacuum pump to stop working and connects the power supply of the temperature-controlled electric heater to heat the hydraulic oil in the oil treatment chamber. Check the set temperature and current oil temperature on the set temperature / current temperature display. During this process, small bubbles will be observed escaping from the oil and concentrating in the gas. If heating causes the oil to boil in the liquid separation chamber, adjust the heating temperature setting knob to lower the temperature setting. When the oil temperature in the oil processing chamber reaches the preset value, the ultrasonic generator starts and works to accelerate the escape and collapse of bubbles in the oil. During this process, as the gas escapes, pressure changes will occur in the gas-liquid separation chamber. When the pressure is greater than 3000Pa, the vacuum pump starts under the control of the pressure switch and stops when the pressure is less than 1500Pa. After the ultrasonic generator works, the power is cut off, and the yellow-green dual-color indicator light shows green for the exhaust position, indicating that the exhaust work is complete.

11. The exhaust method according to claim 10, characterized in that, The method also includes: Set the working status knob to the refueling position. Two-position two-way shut-off valve three is closed, while two-position two-way shut-off valves two and one are open. The electric pump is powered on and starts working, drawing oil from the oil treatment chamber through the refueling pipeline, pressurizing it, and sending it into the accumulator through the check valve. Then, through the self-sealing connector of the on-machine refueling pipeline and the on-machine ground pressure refueling port, the vented oil is sent into the on-machine hydraulic system. As the oil in the oil treatment chamber is drawn away, the liquid level drops to the trigger point of the low liquid level signal, the electric pump is powered off, and the yellow-green dual-color indicator light turns green when refueling, indicating that the refueling work is complete. This completes one work cycle.

12. A method for venting oil in a self-pressurizing hydraulic tank system, characterized in that, The method is implemented using the oil venting device according to any one of claims 1 to 8, and the method includes: Connect a DC power supply to the power interface. Connect the self-sealing connector of the oil suction line on the machine to the ground-based pressure oil suction port on the machine. Connect the self-sealing connector of the oil refueling line on the machine to the ground-based pressure refueling port on the machine. On the control panel, set the working mode knob to the manual position and the working status knob to the off position. Press the main power switch. At this time, the green indicator light for the manual position will illuminate, and the red indicator light will illuminate. Set the working mode knob to the automatic position. At this time, the green indicator light for the manual position will turn off, and the automatic position will illuminate. The equipment will automatically start the working cycle and complete the venting of all oil in the machine system.

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