Self-pressurization oil tank, hydraulic system, control method of hydraulic system and aircraft

Abstract

The invention relates to a self-pressurization oil tank which comprises a shell assembly which comprises a first shell used for containing low-pressure fluid and a second shell used for containing high-pressure fluid. The piston assembly is arranged in the shell assembly and comprises a first piston matched in the first shell, a second piston matched in the second shell and a piston rod connected between the first piston and the second piston; and the driving device comprises a first magnetic driving device which is attached to the first piston and a second magnetic driving device which has a magnetic acting force with the first magnetic driving device, and the driving device enables the first piston to be driven to move along the moving direction so as to increase the pressure of the low-pressure fluid in the first shell. The oil tank can increase the oil supply pressure of a hydraulic system in an initial state, is convenient to install and maintain, and can ensure the safety of the oil tank. In addition, the invention further relates to a hydraulic system, a control method of the hydraulic system and an aircraft.

Description

Technical Field

[0001] The invention relates to a self-pressurizing oil tank and a hydraulic system. In addition, the invention also relates to a control method of the hydraulic system and an aircraft. Background Art

[0002] The hydraulic energy system (or hydraulic system) of aircraft such as civil airliners provides hydraulic energy to hydraulic users such as the landing gear, elevators, rudders, flaps, ailerons, etc. on the aircraft, thereby realizing the aircraft's take-off, climb, roll, yaw, landing and other actions. It is a key system of the aircraft.

[0003] At present, the hydraulic energy systems of civil aircraft are basically closed hydraulic systems. In order to ensure that the hydraulic energy systems can provide hydraulic energy stably, the fuel tanks of civil aircraft all use pressurized fuel tanks to provide a certain auxiliary oil suction pressure for the hydraulic pump.

[0004] Pressurized fuel tanks can usually be divided into bleed-air pressurized fuel tanks and self-pressurized fuel tanks. Bleed-air pressurized fuel tanks pressurize the fuel tank through the aircraft's air source system, while self-pressurized fuel tanks pressurize the fuel tank through the pressure of the hydraulic energy system itself. Compared with bleed-air fuel tanks, self-pressurized fuel tanks have the advantages of simple structure, light weight, small size, and not easy to introduce gas pollution to the system. At present, the hydraulic energy systems of new civil aircraft basically use self-pressurized fuel tanks, such as B787, A380, A350, C919, etc.

[0005] Since the self-pressurizing oil tank uses the pressure of the hydraulic system itself for pressurization, in order to ensure that the oil tank can still provide a certain auxiliary oil suction pressure for the hydraulic pump when the hydraulic system is started, an accumulator and a self-pressurizing priority valve can be configured for the self-pressurizing oil tank. In this way, when the hydraulic system is shut down, the accumulator can still provide a certain initial auxiliary oil suction pressure for the self-pressurizing oil tank.

[0006] For example, in the invention patent with application number 2017210352909 and titled “Aircraft Hydraulic Pump Self-pressurization System” filed by Shenyang Aircraft Design Institute of China Aviation Industry Corporation on August 18, 2017, an aircraft hydraulic pump self-pressurization system is disclosed, including a hydraulic oil tank, an accumulator connected to the hydraulic oil tank, and an air charging device connected to the accumulator. The accumulator is connected to the system hydraulic pump. The hydraulic oil tank includes a liquid seal, a piston rod assembly, a piston and an outer cylinder. The liquid seal is a hollow structure with a nozzle and The rod part and the nozzle of the liquid seal are fixedly connected with the accumulator, the rod part of the liquid seal is sleeved in the piston rod assembly and slidably connected thereto, the piston rod assembly is sleeved in the outer tube, the piston is fixed to the outer wall of the piston rod assembly and is in sealing contact with the outer tube, the charging device transmits the high-pressure gas to the liquid seal through the accumulator, so that the piston rod assembly slides along the rod part of the liquid seal, the oil pressure in the hydraulic oil tank is maintained, and the accumulator is used to provide the oil tank with initial boost pressure, which effectively solves the boost problem during the starting process of the aircraft hydraulic pump and avoids cavitation in the hydraulic pump during the starting process.

[0007] This patent provides initial boost pressure to the oil tank by inflating the accumulator before the hydraulic pump starts to push the tank piston to squeeze the oil, ensuring that the suction pressure at the start of the pump meets the requirements and avoiding empty suction and starting failure of the pump. However, the accumulator provides a limited time for holding pressure, and the holding time decreases with the increase of leakage in the self-boosting priority valve and the oil tank. When the hydraulic system is shut down for too long and the pressure in the accumulator is exhausted, the self-boosting tank will not be able to provide auxiliary suction pressure for the hydraulic pump when the hydraulic system is started again, which will be detrimental to the start-up and operating life of the hydraulic pump.

[0008] Therefore, there is a need to improve the prior art self-pressurizing fuel tank so as to provide an improved self-pressurizing fuel tank that can overcome one or more disadvantages of the prior art. Summary of the invention

[0009] The object of the present invention is to provide a self-pressurizing fuel tank which can provide auxiliary boosting pressure for the self-pressurizing fuel tank after the pressure of the self-pressurizing system is exhausted.

[0010] According to a first aspect of the present invention, a self-pressurizing oil tank for a hydraulic system is proposed, which may include a housing assembly, the housing assembly including a first housing for accommodating a low-pressure fluid and a second housing for accommodating a high-pressure fluid, the first housing being separated from the second housing by an intermediate wall; a piston assembly, the piston assembly being arranged in the housing assembly and including: a first piston fitted in the first housing, a second piston fitted in the second housing and a piston rod connected between the first piston and the second piston; and a driving device, the driving device including a first magnetic driving device attached to the first piston and a second magnetic driving device having a magnetic force acting on the first magnetic driving device, the driving device causing the first piston to be driven to move along a moving direction to increase the pressure of the low-pressure fluid in the first housing.

[0011] This self-pressurizing oil tank can increase the oil supply pressure in the initial working state of the hydraulic system, especially when the hydraulic pump is started. Providing the initial (auxiliary) suction pressure for the hydraulic pump through this self-pressurizing oil tank is beneficial to the start-up and operating life of the hydraulic pump, and improves the reliability of the hydraulic system. This self-pressurizing oil tank does not require additional accumulators and self-pressurizing priority valves to provide pressure maintenance for the oil tank. In addition, providing a magnetic drive device in the oil tank can facilitate installation and maintenance, and can ensure the safety of the oil tank.

[0012] According to the above aspect of the present invention, preferably, at least one of the first magnetic driving device and the second magnetic driving device may be an electromagnetic driving device, which includes an iron core and an electromagnetic coil arranged around the iron core.

[0013] The electromagnetic drive device can generate mutually repulsive forces and more conveniently and accurately control the magnitude of the driving force, thereby providing a more suitable auxiliary starting pressure for the hydraulic pump.

[0014] According to the above aspects of the present invention, preferably, the first magnetic drive device and the second magnetic drive device can both be electromagnetic drive devices, wherein the first magnetic drive device includes a first iron core and a first electromagnetic coil arranged around the first iron core, and the second magnetic drive device includes a second iron core and a second electromagnetic coil arranged around the second iron core.

[0015] This arrangement can improve the magnetic force and prevent the core of the electromagnet from being attracted by the permanent magnet after power is turned off.

[0016] According to a second aspect of the present invention, a hydraulic system is proposed, which may include the self-pressurizing oil tank according to the first aspect; a hydraulic pump, the input of which is fluidically connected to a first housing of the self-pressurizing oil tank via an oil suction line; and a hydraulic user, the hydraulic user is fluidically connected to an output of the hydraulic pump via a high-pressure line, wherein the output of the hydraulic pump is fluidically connected to a second housing of the self-pressurizing oil tank.

[0017] This hydraulic system can achieve continuous self-pressurization by using a self-pressurizing oil tank, so that the hydraulic pump can respond faster to provide the desired hydraulic flow and pressure, ensure the reliability of the hydraulic system, and reduce maintenance costs.

[0018] According to the above aspects of the present invention, preferably, the first housing may include: a first opening for supplying low-pressure fluid to the input of the hydraulic pump via an oil suction line, and a second opening for receiving low-pressure fluid from the output of the hydraulic user via a system return line; and the second housing includes a third opening for receiving high-pressure fluid from the output of the hydraulic pump via a high-pressure line.

[0019] By means of this arrangement, continuous circulation of the hydraulic fluid in the hydraulic system can be achieved, and in the process, continuous self-pressurization of the oil tank can be achieved by means of the high-pressure fluid of the output part of the hydraulic pump.

[0020] According to the above aspect of the present invention, preferably, the hydraulic system may further include a pressure accumulator, which is provided on the high-pressure pipeline and is fluidically connected to the third port.

[0021] This accumulator can reduce pressure fluctuations in the hydraulic line on the one hand, and can serve as a redundant arrangement on the other hand, thereby further improving the reliability of the hydraulic system.

[0022] According to the above aspects of the present invention, preferably, the hydraulic system may further include a self-pressurizing priority valve, and the self-pressurizing priority valve is connected in series with the pressure accumulator.

[0023] This arrangement can further help achieve the self-pressurization performance of the hydraulic system and can adjust the size of the initial starting pressure, thereby meeting more flexible usage scenarios.

[0024] According to the above aspect of the present invention, preferably, the hydraulic pump may include a first hydraulic pump and a second hydraulic pump arranged in parallel with the first hydraulic pump, the first hydraulic pump is driven by the engine, and the second hydraulic pump is driven by the motor.

[0025] This arrangement allows the two hydraulic pumps to be used as primary and secondary backup, further increasing the reliability and flexibility of the hydraulic system.

[0026] According to a third aspect of the present invention, a control method for a hydraulic system is proposed, comprising: providing a hydraulic system according to the second aspect; in an initial starting step, activating a drive device to drive a first piston to move along a moving direction to increase the pressure of a low-pressure fluid; after the pressure of the low-pressure fluid exceeds a first predetermined pressure, starting a hydraulic pump; and after the pressure of the high-pressure fluid in a second housing exceeds a second predetermined pressure, deactivating the drive device.

[0027] The control method can achieve continuous self-pressurization operation of the hydraulic system by allowing the pressure of the low-pressure fluid to exceed the first predetermined pressure when the pressure of the high-pressure fluid exceeds the second predetermined pressure.

[0028] According to a third aspect of the present invention, an aircraft is provided, which is provided with the hydraulic system according to the second aspect.

[0029] Therefore, the self-pressurizing oil tank of the present invention can meet the use requirements, overcome the shortcomings of the prior art and achieve the predetermined purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to further clearly describe the self-pressurizing fuel tank according to the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. In the accompanying drawings:

[0031] Figure 1 is a schematic diagram of a hydraulic system with a self-pressurizing tank according to a non-limiting embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of a self-pressurizing fuel tank according to a non-limiting embodiment of the present invention; and

[0033] Figure 3 is another schematic diagram of a hydraulic system with a self-pressurizing reservoir according to a non-limiting embodiment of the present invention.

[0034] The above drawings are merely schematic and are not drawn strictly to scale.

[0035] List of reference numerals in the figures and embodiments:

[0036] 1000 - Hydraulic system, including:

[0037] 100 - Self-pressurizing fuel tank, including:

[0038] 10 - Shell assembly, including:

[0039] 11- The first housing comprises:

[0040] 111 - First opening;

[0041] 112 - second opening;

[0042] 12-Second housing, comprising:

[0043] 121 - third opening;

[0044] 13 - middle wall;

[0045] 14 - first end cover;

[0046] 15 - second end cover;

[0047] 20 - Piston assembly, including:

[0048] 21 - first piston;

[0049] 22 - second piston;

[0050] 23 - piston rod;

[0051] 30 - Drive device, including:

[0052] 31- The first magnetic drive device comprises:

[0053] 31A-first core;

[0054] 31B-first electromagnetic coil;

[0055] 32-Second magnetic drive device, comprising:

[0056] 32A-second core;

[0057] 32B - second electromagnetic coil;

[0058] 40 - power supply;

[0059] 200 - Hydraulic pump, including:

[0060] 201 - first hydraulic pump;

[0061] 201A - Engine;

[0062] 202 - second hydraulic pump;

[0063] 202A - Motor;

[0064] 203 - Check valve, including:

[0065] 203A-First check valve;

[0066] 203B-First check valve;

[0067] 300 – hydraulic users;

[0068] 400 - accumulator;

[0069] 500 - self-pressurizing priority valve;

[0070] 600 - filter;

[0071] 700 - pressure relief valve;

[0072] L1 - oil suction pipeline, including:

[0073] L11 - first oil suction pipeline;

[0074] L12 - second oil suction line;

[0075] L2 - High pressure pipeline, including:

[0076] L21 - first high pressure pipeline;

[0077] L22 - second high pressure pipeline;

[0078] L23 - the third high pressure pipeline;

[0079] L24 - the fourth high pressure pipeline;

[0080] L3 - system oil return pipeline;

[0081] L4 - Pump casing oil return line, including:

[0082] L41 - oil return line from the first pump casing;

[0083] L42 - oil return line from the second pump casing;

[0084] L5 - pressure relief pipeline;

[0085] X - direction of movement. DETAILED DESCRIPTION

[0086] It should be understood that, unless expressly stated otherwise, the present invention may adopt various alternative orientations and step sequences. It should also be understood that the specific devices shown in the drawings and described in the specification are merely exemplary embodiments of the inventive concepts disclosed and defined herein. Therefore, unless otherwise expressly stated, the specific orientations, directions or other physical characteristics of the various embodiments disclosed should not be considered as limiting.

[0087] The hydraulic system of an aircraft is one of the important mechanical systems on the aircraft. It uses hydraulic oil (usually special oil) to transfer energy and power to drive actuators to control flight control surfaces, landing gear, flaps and speed brakes, etc.

[0088] Figure 1 is a schematic diagram of a hydraulic system 1000 with a self-pressurizing tank 100 according to a non-limiting embodiment of the present invention.

[0089] As shown in the figure and as a non-limiting example, the hydraulic system 1000 may mainly include a self-pressurized oil tank 100 , a hydraulic pump 200 , a hydraulic user 300 , various hydraulic lines, and the like.

[0090] The self-pressurizing tank 100 can mainly contain hydraulic fluid such as hydraulic oil, so that the hydraulic fluid is pressurized to a desired high pressure via the hydraulic pump 200 and then supplied to various hydraulic users 300, such as landing gear, elevator, rudder, flap, aileron, etc. After passing through the hydraulic users 300, the hydraulic fluid at a high pressure can be reduced to a lower pressure, and then can be returned to the self-pressurizing tank 100, thereby realizing the circulation operation of the hydraulic fluid in the system.

[0091] Figure 2 is a schematic diagram of a self-pressurizing fuel tank 100 according to a non-limiting embodiment of the present invention.

[0092] As shown in the figure, the self-pressurizing oil tank 100 may mainly include: a housing assembly 10, a piston assembly 20 and a driving device 30, etc.

[0093] The shell assembly 10 may include a first shell 11 for accommodating a low-pressure fluid and a second shell 12 for accommodating a high-pressure fluid, and the first shell 11 and the second shell 12 may be separated by an intermediate wall 13 to form an accommodating space isolated from each other, thereby preventing the low-pressure fluid in the first shell 11 from directly connecting to the high-pressure fluid in the second shell 12.

[0094] As an example, the first housing 11 and the second housing 12 may each be a substantially cylindrical structure, and the inner diameter of the first housing 11 may be greater than the inner diameter of the second housing 12 .

[0095] like Figure 1 and 2 As shown in FIG. 1 , the first housing 11 may include a first opening 111 and a second opening 112 disposed on the housing. The first opening 111 may supply low-pressure fluid to the input of the hydraulic pump 200 via the suction line L1. The second opening 112 may receive low-pressure fluid from the output of the hydraulic user 300 via the system return line L3.

[0096] As an example and as Figure 2 As shown, the first opening 111 and the second opening 112 may be provided on the intermediate wall 13 and may be provided with corresponding joints and sealing members for respectively being liquid-tightly connected to the oil suction line L1 and the system oil return line L3 .

[0097] The second housing 12 may include a third opening 121 for receiving high-pressure fluid from an output portion of the hydraulic pump 200 via the high-pressure line L2. As an example, the third opening 121 may be provided on a circumferential wall of the second housing 12.

[0098] The first shell 11 may be provided with a first end cover 14 , and the second shell 12 may be provided with a second end cover 15 . The first end cover 14 and the second end cover 15 may be arranged opposite to the middle wall 13 , so that the middle wall 13 is located between the first end cover 14 and the second end cover 15 .

[0099] The first end cover 14 and the second end cover 15 may be fastened to the circumferential walls of the first housing 11 and the second housing 12 , respectively, via fasteners such as screws.

[0100] like Figure 2 As schematically shown in FIG. 1 , the piston assembly 20 may be disposed in the housing assembly 10 and include a conjoined double piston. For example, the conjoined double piston may include a first piston 21 fitted in the first housing 11, a second piston 22 fitted in the second housing 12, and a piston rod 23 connected between the first piston and the second piston. In this way, the movement of one piston will force the other piston to follow the movement to achieve the desired volume change purpose, thereby changing the pressure of the hydraulic fluid.

[0101] For example, between the first piston 21 and the intermediate wall 13 (eg Figure 2 The first volume of the first housing 11 can be formed between the second piston 22 and the intermediate wall (eg, the left side of the intermediate wall 13 shown in FIG. 1 ), while the first volume of the first housing 11 can be formed between the second piston 22 and the intermediate wall (eg, the left side of the intermediate wall 13 shown in FIG. 1 ). Figure 2 A second volume of the second housing 12 can be formed between the first and second volumes (shown in FIG. 1 and FIG. 2 ) and the second volume (shown in FIG. 2 ). Low-pressure fluid can be contained in the first volume, and high-pressure fluid can be contained in the second volume.

[0102] Before the hydraulic pump 200 works, since the hydraulic fluid is sealed in the first volume, negative pressure may be generated in the first volume at the moment the hydraulic pump 200 works, causing the hydraulic fluid to be unable to be smoothly supplied to the input part of the hydraulic pump 200 through the oil suction line L1.

[0103] In order to increase the pressure of the hydraulic fluid in the first volume, the present invention provides a drive device 30, which may include a first magnetic drive device 31 attached to the first piston 21 and a second magnetic drive device 32 that has a magnetic force acting on the first magnetic drive device 31, which magnetic force may be, for example, a magnetic repulsive force.

[0104] Through the magnetic repulsive force between the first magnetic drive device 31 and the second magnetic drive device 32, the drive device 30 can drive the first piston 21 to move along the moving direction X to increase the pressure of the low-pressure fluid in the first volume of the first housing 11. At this time, for example, the pressure of the low-pressure fluid in the first volume can be greater than the pressure at the input of the hydraulic pump 200. In this way, as the pressure of the low-pressure fluid increases, it helps to supply the low-pressure fluid to the input of the hydraulic pump 200 via the suction line L1.

[0105] Preferably, at least one of the first magnetic driving device 31 and the second magnetic driving device 32 may be an electromagnetic driving device, which includes an iron core and an electromagnetic coil arranged around the iron core.

[0106] More preferably, the first magnetic drive device 31 and the second magnetic drive device 32 are both electromagnetic drive devices, wherein the first magnetic drive device 31 may include a first iron core 31A and a first electromagnetic coil 31B arranged around the first iron core, and the second magnetic drive device 32 may similarly include a second iron core 32A and a second electromagnetic coil 32B arranged around the second iron core.

[0107] like Figure 2 As schematically shown in FIG. 1 , the first magnetic drive device 31 can move together with the first piston 21 and thus can be referred to as a moving magnetic drive device, while the second magnetic drive device 32 is fixed to the first end cover 14 and thus can be referred to as a stationary magnetic drive device.

[0108] The first electromagnetic coil 31B and the second electromagnetic coil 32B can be connected to an external power source 40, such as a 28V DC power source, via power lines. Their power lines can be arranged to be wound in opposite directions or have opposite polarities, so that after being connected to the power source 40, there is sufficient magnetic repulsion between the first magnetic drive device 31 and the second magnetic drive device 32 to force the first piston 21 to move in the moving direction X.

[0109] Return to reference Figure 1 And as an example, the hydraulic pump 200 may include a first hydraulic pump 201 and a second hydraulic pump 202 arranged in parallel with the first hydraulic pump 201. The first hydraulic pump 201 may be driven by an engine 201A, and the second hydraulic pump 202 may be driven by a motor 202A. The first hydraulic pump 201 may be connected to the first opening 111 via a first suction line L11, and the second hydraulic pump 202 may be connected to the first opening 111 via a second suction line L12. The first suction line L11 may be connected in parallel with the second suction line L12, and may have a common line portion.

[0110] As shown in the figure, the hydraulic user 300 can be arranged downstream of the hydraulic pump 200, and a one-way valve 203 can be arranged between the hydraulic pump 200 and the hydraulic user 300. The hydraulic user 300 can be, for example, a landing gear, an elevator, a rudder, a flap, an aileron, etc., and is schematically shown in the figure. After passing through the hydraulic user 300, the hydraulic fluid at a high pressure can be reduced to a lower pressure, and then can be returned to the self-pressurizing tank 100, thereby realizing the circulation operation of the hydraulic fluid in the system.

[0111] As an example, the hydraulic user 300 may be connected to the downstream of the first hydraulic pump 201 and the second hydraulic pump 202 via the first high pressure line L21 and the second high pressure line L22, respectively. The first and second one-way valves 203A and 203B may be provided in the first and second high pressure lines L21 and L22, respectively.

[0112] like Figure 1 As shown, the high-pressure pipeline L2 may be provided with a filter 600 downstream of the one-way valve 203, and the filter 600 may be used to remove impurities in the hydraulic fluid to protect the hydraulic user 300. In addition, the high-pressure pipeline L2 may be divided into a third high-pressure pipeline L23 and a fourth high-pressure pipeline L24 at the filter 600. The third high-pressure pipeline L23 may be directly connected to the third opening 121 of the second housing 12 for self-pressurization of the oil tank, while the fourth high-pressure pipeline L24 may be connected to various hydraulic users 300 to enable the hydraulic users 300 to work.

[0113] As described above, after passing through the hydraulic user 300, the hydraulic fluid at high pressure can be reduced to a lower pressure, and then can be returned to the self-pressurizing oil tank 100 via the system return line L3. Figure 1 As shown, a filter 600 may also be provided in the system oil return line L3.

[0114] In addition, the hydraulic system 1000 may be provided with a cooling arrangement, such as Figure 1 As shown, the cooling arrangement may include a pump case oil return line L4 for guiding the hydraulic fluid, so that the hydraulic fluid used for cooling the hydraulic pump 200 may be connected to the system oil return line L3 via the pump case oil return line L4, and then returned to the self-pressurizing oil tank 100. As an example, a first pump case oil return line L41 may be provided downstream of the first hydraulic pump 201, and a second pump case oil return line L42 may be provided downstream of the second hydraulic pump 202. Preferably, filters may be provided in the first pump case oil return line L41 and the second pump case oil return line L42, respectively.

[0115] Continue to refer Figure 1 The hydraulic system 1000 may be provided with a pressure relief line L5, on which a pressure relief valve 700 may be provided to prevent overload failure of the hydraulic system 1000. As an example, the pressure relief valve 700 may be arranged between the one-way valve 203 and the hydraulic user 300.

[0116] The control method of the hydraulic system 1000 according to the present invention may mainly include the following steps:

[0117] In the initial startup step, the hydraulic pump 200 does not work. At this time, the driving device 30 is activated to drive the first piston 21 to move along the moving direction X to increase the pressure of the low-pressure fluid;

[0118] After the pressure of the low-pressure fluid exceeds the first predetermined pressure, the hydraulic pump 200 is started;

[0119] After the pressure of the high-pressure fluid in the second housing 12 exceeds the second predetermined pressure, the driving device 30 is deactivated.

[0120] At this time, as the high-pressure fluid from the output portion of the hydraulic pump 200 enters the second volume through the third opening 121, the high-pressure fluid will force the second piston 22 to move in the moving direction X, that is, Figure 2 Since the second piston 22 is fixedly connected to the first piston 21 via the piston rod 23, the first piston 21 will also be forced to move in the moving direction X, thereby reducing the volume of the first volume, and then the pressure of the low-pressure fluid contained therein will increase.

[0121] As a preferred embodiment, when the pressure of the high-pressure fluid exceeds the second predetermined pressure, the pressure of the low-pressure fluid exceeds the first predetermined pressure.

[0122] It should be understood that the method steps described above are exemplary, and those skilled in the art may adjust the order of the method steps, add corresponding steps or delete relevant steps without departing from the scope of the present invention.

[0123] Figure 3 is another schematic diagram of a hydraulic system 1000 with a self-pressurizing tank 100 according to a non-limiting embodiment of the present invention.

[0124] Except as described below, Figure 3 The hydraulic system 1000 shown in FIG. Figure 1 The hydraulic system 1000 shown in FIG. 1 is substantially the same or similar, and therefore, for the sake of brevity, repeated descriptions of the same or similar components are omitted, and the same or similar components are marked with the same or similar reference numerals.

[0125] exist Figure 3 The hydraulic system 1000 shown in FIG. 1 further includes a pressure accumulator 400 . The pressure accumulator 400 is provided on the high-pressure line L2 and is fluidically connected to the third opening 121 .

[0126] Additionally or alternatively, the hydraulic system 1000 may further include a self-pressurizing priority valve 500 , which is connected in series with the accumulator 400 .

[0127] As used herein, the terms "inner surface" and "outer surface" indicating position or orientation, and the terms "first" and "second" used to indicate order are only intended to enable those of ordinary skill in the art to better understand the concept of the present invention shown in the form of a preferred embodiment, and are not intended to limit the present invention. Unless otherwise specified, all orders, positions or orientations are only used for the purpose of distinguishing one element / component / structure from another element / component / structure, and unless otherwise specified, do not represent any specific order, order of operation, direction or orientation. For example, in an alternative embodiment, the "first shell" may be the "second shell".

[0128] As used herein, unless otherwise indicated, the terms "substantially" and "approximately" are interpreted to mean plus or minus five percent of the value or range of values, or to mean a deviation of plus or minus five percent of the shape and / or position.

[0129] In summary, the self-pressurizing oil tank 100 according to the embodiment of the present invention overcomes the shortcomings of the prior art and achieves the intended purpose of the invention.

[0130] Although the self-pressurizing oil tank of the present invention is described above in conjunction with the preferred embodiments, those skilled in the art should recognize that the above examples are only for illustration and cannot be used as limitations of the present invention. Therefore, various modifications and variations can be made to the present invention within the spirit of the claims, and these modifications and variations will fall within the scope of the claims of the present invention.

Claims

1. A self-pressurizing oil tank (100) for a hydraulic system, comprising: A housing assembly (10), comprising a first housing (11) for accommodating a low-pressure fluid and a second housing (12) for accommodating a high-pressure fluid, wherein the first housing and the second housing are separated by an intermediate wall (13); A piston assembly (20), the piston assembly being arranged in the housing assembly (10) and comprising: a first piston (21) fitted in the first housing (11), a second piston (22) fitted in the second housing (12), and a piston rod (23) connected between the first piston and the second piston; as well as A drive device (30) includes a first magnetic drive device (31) attached to the first piston (21) and a second magnetic drive device (32) having a magnetic force acting on the first magnetic drive device (31), wherein the drive device drives the first piston (21) to move along a moving direction (X) to increase the pressure of the low-pressure fluid in the first housing (11).

2. The self-pressurizing oil tank (100) according to claim 1, characterized in that: At least one of the first magnetic drive device (31) and the second magnetic drive device (32) is an electromagnetic drive device, which includes an iron core and an electromagnetic coil arranged around the iron core.

3. The self-pressurizing oil tank (100) according to claim 1, characterized in that: The first magnetic drive device (31) and the second magnetic drive device (32) are both electromagnetic drive devices, wherein the first magnetic drive device (31) includes a first iron core (31A) and a first electromagnetic coil (31B) arranged around the first iron core, and the second magnetic drive device (32) includes a second iron core (32A) and a second electromagnetic coil (32B) arranged around the second iron core.

4. A hydraulic system (1000), comprising: The self-pressurizing oil tank (100) according to any one of claims 1 to 3; a hydraulic pump (200), the input portion of which is fluidically connected to the first housing (11) of the self-pressurizing oil tank (100) via an oil suction line (L1); and a hydraulic user (300) which is fluidically connected to an output portion of the hydraulic pump (200) via a high-pressure pipeline (L2), The output portion of the hydraulic pump (200) is fluidically connected to the second housing (12) of the self-pressurizing oil tank (100).

5. The hydraulic system (1000) according to claim 4, characterized in that: The first housing (11) comprises: a first opening (111) for supplying the low-pressure fluid to an input portion of a hydraulic pump (200) via the suction line (L1), and A second opening (112) is used to receive low-pressure fluid from an output portion of the hydraulic user (300) via a system return line (L3); and The second housing (12) includes a third opening (121) for receiving high-pressure fluid from an output portion of the hydraulic pump (200) via the high-pressure pipeline (L2).

6. The hydraulic system (1000) according to claim 5, characterized in that: The hydraulic system further includes a pressure accumulator (400) which is disposed on the high-pressure line (L2) and is fluidically connected to the third opening (121).

7. The hydraulic system (1000) according to claim 6, characterized in that: The hydraulic system further comprises a self-pressurizing priority valve (500), which is connected in series with the pressure accumulator (400).

8. The hydraulic system (1000) according to any one of claims 4 to 7, characterized in that: The hydraulic pump (200) comprises a first hydraulic pump (201) and a second hydraulic pump (202) arranged in parallel with the first hydraulic pump, the first hydraulic pump (201) being driven by an engine, and the second hydraulic pump (202) being driven by a motor.

9. A method for controlling a hydraulic system (1000), comprising: Providing a hydraulic system (1000) according to any one of claims 4-8; In an initial start-up step, the driving device (30) is activated to drive the first piston (21) to move along a moving direction (X) to increase the pressure of the low-pressure fluid; After the pressure of the low-pressure fluid exceeds a first predetermined pressure, starting the hydraulic pump (200); After the pressure of the high-pressure fluid in the second housing (12) exceeds a second predetermined pressure, the driving device (30) is deactivated.

10. An aircraft, provided with a hydraulic system (1000) according to any one of claims 4-8.

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