A method for pressurizing a composite sensor self-protected pressure type self-pressurized fuel tank

Abstract

This invention relates to a pressurization method for a composite sensor self-pressurizing self-boosting oil tank, belonging to the technical field of self-boosting oil tanks. It solves the problems of large size, numerous components, and inability to monitor in real time in existing self-boosting oil tanks. The pressurization method for the composite sensor self-pressurizing self-boosting oil tank provided by this invention includes the following steps: Step 1: Injecting low-pressure oil into the low-pressure oil chamber and filling the gas chamber with high-pressure gas to initially compress the low-pressure oil for primary pressurization; Step 2: Injecting high-pressure oil into the high-pressure oil chamber for secondary pressurization, thereby achieving the rated pressurization function. This invention uses air pressure as the low-pressure boosting pressure source during system startup, reducing the need for additional accumulators. Multiple sensors form a redundant sensor network, enabling real-time monitoring of high-pressure oil pressure, low-pressure oil pressure, air pressure, and piston displacement within the system.

Description

Technical Field

[0001] This invention relates to the field of self-pressurizing oil tank technology, and in particular to a pressurization method for a composite sensing self-pressure maintaining type self-pressurizing oil tank. Background Technology

[0002] Self-pressurized oil tanks are oil tanks that use system pressure oil as the source of pressure boosting, and are widely used in aviation and other fields. Hydraulic oil tanks are the main oil storage devices in hydraulic systems. In hydraulic systems, the pump draws oil from the tank, pressurizes it, and uses it as a pressure oil source to provide energy to the hydraulic system.

[0003] Existing self-pressurizing oil tanks use system pressure oil as the pressurization source. To ensure the normal operation of the pump during system startup, an accumulator needs to be installed at the pressurization port of the tank as a short-term pressure source to guarantee reliable oil intake. This results in a large self-pressurizing oil tank with many components. Furthermore, current self-pressurizing oil tanks lack sensors, or rely on mechanical gauges to measure certain key physical quantities. This limited measurement method makes it impossible to perform fusion calculations based on the collected information, resulting in limited sensing information, low information utilization, and an inability to achieve real-time monitoring of the pressurizing oil tank. This creates many obstacles for subsequent use and maintenance. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a pressurization method for a composite sensing self-pressure maintaining self-pressurizing oil tank, in order to solve the problems of existing self-pressurizing oil tanks being large in size, having many components, and being unable to be monitored in real time.

[0005] This invention provides a pressurization method for a composite sensing self-pressure maintaining self-pressurizing oil tank, the steps of which include:

[0006] Step 1: Inject low-pressure oil into the low-pressure oil chamber and fill the gas chamber with high-pressure gas to initially compress the low-pressure oil and perform a pressurization.

[0007] Step 2: Inject high-pressure oil into the high-pressure oil chamber for secondary pressurization, thereby achieving the rated pressurization function.

[0008] Furthermore, in step 2, if the high-pressure oil chamber is overpressurized, the high-pressure oil in the high-pressure oil chamber flows into the low-pressure oil chamber to release the pressure.

[0009] Furthermore, in step 2, if the low-pressure oil chamber is overpressurized, the low-pressure oil flows out to the outside to relieve the pressure.

[0010] Furthermore, the composite sensing self-pressure maintaining self-pressurizing oil tank includes an oil tank body, and a main piston is provided inside the oil tank body. The main piston divides the inner cavity of the oil tank body into a low-pressure oil chamber and a first chamber.

[0011] Furthermore, the main body of the fuel tank includes a fuel tank cylinder, an end cap, and a displacement sensor end cap, with the end cap and the displacement sensor end cap respectively covering both ends of the fuel tank cylinder.

[0012] Furthermore, the low-pressure oil chamber is located between the main piston and the end cap, and the first chamber is located between the main piston and the displacement sensor end cap.

[0013] Furthermore, the composite sensing self-pressure maintaining self-pressurizing oil tank also includes an extended cylinder and a high-pressure end cap, the high-pressure end cap being disposed on one end of the extended cylinder, and the other end of the extended cylinder being connected to the end cap.

[0014] Furthermore, the end cap is equipped with a low-pressure sensor, a gas pressure sensor, and a temperature sensor.

[0015] Furthermore, a high-pressure sensor is provided on the high-pressure end cap.

[0016] Furthermore, a displacement sensor is provided on the end cap of the displacement sensor.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] (1) The self-pressurizing oil tank of the present invention adopts a floating gas piston design, which uses high-pressure gas as the pressurizing medium during the non-working stage, which can ensure the smooth oil suction and start-up of the hydraulic pump. There is no need to configure an accumulator as a pressure holding device, thus reducing the need for additional components.

[0019] (2) The self-pressurizing oil tank of the present invention uses multiple sensors to monitor the state of each medium in the oil tank. Among them, the high pressure sensor, low pressure sensor, air pressure sensor and displacement sensor form redundancy. If any sensor fails, it can be indirectly calculated through the information of the other three sensors, thus avoiding information loss caused by sensor failure.

[0020] (3) The self-pressurizing oil tank air pressure sensor and the high pressure sensor of the present invention simultaneously detect the pressure on both sides of the air piston, so as to avoid the air piston moving to the limit position when the oil or gas leaks, and the pressure on both sides no longer balances, thereby avoiding the failure to detect leakage faults caused by short-term system pressure holding, and improving the fault detection capability.

[0021] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0022] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0023] Figure 1 This is a schematic diagram of the self-pressurization process of a composite sensing self-pressure maintaining self-pressurizing oil tank according to a specific embodiment;

[0024] Figure 2 This is a schematic diagram of the structure of a composite sensing self-pressure maintaining and self-pressurizing oil tank according to a specific embodiment;

[0025] Figure 3 This is a front view structural diagram of a composite sensing self-pressure maintaining and self-pressurizing oil tank according to a specific embodiment;

[0026] Figure 4 For specific embodiments Figure 3 A schematic diagram of the AA section.

[0027] Figure label:

[0028] 1-Oil tank cylinder; 2-End cap; 3-Extended cylinder body; 4-Piston rod; 5-Air piston; 6-Main piston; 7-Large nut; 8-Displacement sensor end cap; 9-High pressure end cap; 10-Pressure relief pipe; 11.1-High pressure relief valve; 11.2-Low pressure relief valve; 12-Displacement sensor; 13.1-High pressure sensor; 13.2-Low pressure sensor; 14-Air pressure sensor; 15-Temperature sensor; 16-Air charging valve; 17.1-Oil supply connector; 17.2-Oil return connector; 18-Oil injection valve. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0030] Another specific embodiment of the present invention, such as Figure 1 As shown, a pressurization method for a composite sensing self-pressure maintaining self-pressurizing oil tank is disclosed, the steps of which include:

[0031] Step 1: Inject low-pressure oil into the low-pressure oil chamber and fill the gas chamber with high-pressure gas to initially compress the low-pressure oil and perform a pressurization.

[0032] Specifically, from the initial stage of operation of the booster oil tank, low-pressure oil is injected into the low-pressure oil chamber in the oil tank through the oil injection valve 18, and high-pressure gas is injected into the air chamber extending into the cylinder 3 through the air filling valve 16. At this time, the air piston 5 moves and presses against the piston on the piston rod 4, driving the main piston 6 to move in the direction of the piston rod 4, thus initially compressing the low-pressure oil.

[0033] Step 2: Inject high-pressure oil into the high-pressure oil chamber for secondary pressurization.

[0034] Specifically, the external hydraulic system is then activated. High-pressure oil enters the high-pressure end cover 9 through the oil connector on the high-pressure end cover 9, and then enters the piston rod 4 through the oil passage at the extended end of the piston rod 4. Subsequently, the high-pressure oil enters the high-pressure oil chamber through the fourth through hole. The high-pressure oil entering the high-pressure oil chamber pushes the air piston 5 in the opposite direction to compress the gas, and at the same time, it drives the main piston 6 through the piston rod 4 to further compress the oil in the low-pressure oil chamber, thereby achieving the rated pressure boosting function.

[0035] Simultaneously, the displacement sensor 12, high-pressure sensor 13.1, low-pressure sensor 13.2, air pressure sensor 14, and temperature sensor 15 begin operation, respectively detecting the displacement of the main piston 6, the pressure in the high-pressure oil chamber, the pressure in the air chamber, the pressure in the low-pressure oil chamber, and the oil temperature. The pressure in the high-pressure oil chamber is limited by the high-pressure relief valve 11.1. If the high-pressure oil chamber is overpressurized, the high-pressure relief valve 11.1 opens, and the high-pressure oil in the high-pressure chamber flows into the low-pressure oil chamber through the pressure relief pipe 10 to release pressure. The pressure in the low-pressure oil chamber is controlled by the low-pressure relief valve 11.2. If the low-pressure oil chamber is overpressurized, the low-pressure relief valve 11.2 opens, and the low-pressure oil flows out to the outside to relieve pressure.

[0036] See Figures 2-4 As shown, this is the composite sensing self-pressure maintaining type self-pressurizing oil tank (hereinafter referred to as the self-pressurizing oil tank) of this embodiment. Combined with... Figure 2 and Figure 4 As shown, the self-pressurizing oil tank includes an oil tank body, a piston, and an extension cylinder 3. The extension cylinder 3 is located at one end of the oil tank body, and the inner cavity of the extension cylinder 3 is connected to the inner cavity of the oil tank body. The piston slides within the inner cavities of the oil tank body and the extension cylinder 3.

[0037] like Figure 1 As shown, the main body of the fuel tank includes a fuel tank cylinder 1, which preferably has a cylindrical structure. Considering the sealing performance during the use of the fuel tank, the main body of the fuel tank also includes an end cap 2 and a displacement sensor end cap 8. The end cap 2 and the displacement sensor end cap 8 are respectively located at both ends of the fuel tank cylinder 1 and seal the fuel tank cylinder 1.

[0038] Furthermore, the oil tank cylinder 1 has flanges at both ends, and the end cap 2 and the displacement sensor end cap 8 are respectively connected to the flanges of the oil tank cylinder 1. Specifically, the end cap 2 and the displacement sensor end cap 8 are preferably disc-shaped structures with through holes evenly distributed along the edge of the disc, and the end cap 2 and the displacement sensor end cap 8 are respectively connected to the flanges at both ends of the oil tank cylinder 1 by bolts.

[0039] To further ensure the sealing performance of the oil tank cylinder 1, the end cover 2 is provided with a first annular groove on the side where it connects to the flange. A sealing ring is provided in the first annular groove, and the thickness of the sealing ring is slightly greater than the depth of the first annular groove. When the end cover 2 is installed on the flange of the oil tank cylinder 1, the compression of the sealing ring further achieves the sealing effect.

[0040] The piston includes a piston rod 4, a pneumatic piston 5, and a main piston 6. One end of the piston rod 4 is connected to the main piston 6, and the other end is a free end. The pneumatic piston 5 is fitted and slides in the middle of the piston rod 4.

[0041] Combination Figure 2 and Figure 4 As shown, the main piston 6 moves inside the oil tank cylinder 1. The main piston 6 divides the cavity inside the oil tank cylinder 1 into two parts: the cavity between the main piston 6 and the end cover 2 is the low-pressure oil cavity, and the cavity between the main piston 6 and the sensor end cover 8 is the first cavity.

[0042] The main piston 6 has a cylindrical structure, open at one end and closed at the other. The open end of the main piston 6 faces the sensor end cover 8, and the closed end faces the end cover 2. To prevent oil in the low-pressure oil chamber from flowing into the first chamber, the outer diameter of the main piston 6 is equal to the inner diameter of the oil tank cylinder 1. This ensures that when the main piston 6 is assembled into the oil tank cylinder 1, the outer circumferential surface of the main piston 6 fits against the inner wall of the oil tank cylinder 1, thus preventing oil in the low-pressure oil chamber from entering the first chamber.

[0043] To further prevent oil from the low-pressure oil chamber from entering the first chamber, the outer cylindrical surface of the main piston 6 is provided with a second annular groove and a third annular groove. Preferably, there are two second annular grooves, located on both sides of the third annular groove. Correspondingly, a sealing ring is provided in the second annular groove, and a guide ring is provided in the third annular groove. When the outer wall of the main piston 6 contacts the inner wall of the oil tank cylinder 1, the inner wall of the oil tank cylinder 1 compresses the sealing ring to further seal the oil tank cylinder 1 and the main piston 6.

[0044] In this embodiment, the outer diameter of the main piston 6 is equal to the inner diameter of the oil tank cylinder 1, and three annular grooves (the second annular groove and the third annular groove) are provided on the outer cylindrical surface of the main piston 6. Guide rings and sealing rings are correspondingly provided in the annular grooves, which effectively achieves the sealing at the connection between the main piston 6 and the oil tank cylinder 1, and prevents the oil in the low-pressure oil chamber from entering the first chamber from the connection between the main piston 6 and the oil tank cylinder 1.

[0045] The piston rod 4 comprises a first cylindrical section, a second cylindrical section, a third cylindrical section, and a fourth cylindrical section connected in sequence, all integrally formed. The first cylindrical section is connected to the main piston 6. The diameter of the second cylindrical section is larger than that of the first cylindrical section. One end of the second cylindrical section is located in the low-pressure oil chamber, and the other end is located in the inner cavity of the protruding cylinder 3.

[0046] For connection with piston rod 4, a mounting seat is provided inside the closed end of main piston 6. The mounting seat has a first through hole that passes through the closed end of main piston 6. The first cylindrical section of piston rod 4 is located inside the first through hole, and the diameter of the first cylindrical section is equal to the diameter of the first through hole. Preferably, the first through hole is located at the axis of main piston 6.

[0047] To prevent oil in the low-pressure oil chamber from flowing into the first chamber from the connection between the piston rod 4 and the first through hole, a fourth annular groove is provided on the inner wall of the first through hole. A sealing ring is provided in the fourth annular groove. When the first cylindrical section is placed in the first through hole, the outer cylindrical surface of the first cylindrical section presses against the sealing ring located in the fourth annular groove, which further achieves the sealing effect.

[0048] In this embodiment, to prevent oil leakage in the low-pressure oil chamber and ensure the pressure inside the low-pressure oil chamber, the outer diameter of the main piston 6 is equal to the inner diameter of the oil tank cylinder 1, so that the outer cylindrical surface of the main piston 6 fits against the inner wall of the oil tank cylinder 1. An annular groove is opened on the outer cylindrical surface of the main piston 6, and a sealing ring is placed in the annular groove. The outer diameter of the first cylindrical section is equal to the diameter of the first through hole, so that the outer cylindrical surface of the first cylindrical section fits against the inner wall of the first through hole. An annular groove is opened on the inner wall of the first through hole, and a sealing ring is placed in the annular groove. Through the cooperation of the above structures, the sealing performance of the main piston 6 side of the low-pressure oil chamber is ensured.

[0049] The first cylindrical section of the piston rod 4 is connected to the main piston 6. The length of the first cylindrical section is greater than the length of the first through hole, and the end of the first cylindrical section is threaded. After the first cylindrical section passes through the first through hole, it is fixed to the mounting base by a large nut 7.

[0050] It is worth noting that, since the diameter of the second cylindrical segment is larger than that of the first cylindrical segment, the connection end between the piston rod 4 and the main piston 6 is a stepped structure. When the first cylindrical segment of the piston rod 4 is located in the first through hole, the step formed by the first cylindrical segment and the second cylindrical segment limits the axial movement of the piston rod 4.

[0051] The first cylindrical section of the piston rod 4 is connected to the main piston 6 located inside the oil tank cylinder 1, and the second cylindrical section passes through the end cover 2 and is connected to the gas piston 5 located in the inner cavity of the cylinder 3. Therefore, the end cover 2 is provided with a second through hole. Preferably, the second through hole is located at the axis of the end cover 2.

[0052] To ensure the sealing effect of the low-pressure oil chamber, the diameter of the second through hole is equal to the outer diameter of the second cylindrical section of the piston rod 4. The inner wall of the second through hole is provided with a fifth annular groove, and a sealing ring is provided in the fifth annular groove. When the second cylindrical section is located in the second through hole, the outer cylindrical surface of the second cylindrical section presses against the sealing ring located in the fifth annular groove, so that the second through hole and the second cylindrical section are effectively sealed.

[0053] The piston 5 and the second cylindrical section can slide relative to each other. The outer diameter of the piston 5 is equal to the diameter of the cylinder 3 extending out of the inner cavity, and the inner diameter of the piston 5 is equal to the outer diameter of the second cylindrical section of the piston rod 4.

[0054] There is an air chamber between the air piston 5 and the end cap 2. In order to ensure the air chamber is airtight, the following connections need to be made airtight: (1) the connection between the outer cylindrical surface of the air piston 5 and the inner wall of the protruding cylinder 3; (2) the connection between the inner wall of the air piston 5 and the outer cylindrical surface of the second cylindrical section; (3) the connection between the protruding cylinder 3 and the end cap 2.

[0055] Specifically, for the seal at the connection between the outer cylindrical surface of the piston 5 and the inner wall of the protruding cylinder 3: the outer wall of the piston 5 is provided with a sixth annular groove and a seventh annular groove, with two of each. The two seventh annular grooves are located between the two sixth annular grooves, and the depth of the seventh annular groove is greater than the depth of the sixth annular groove. A guide band is provided in the sixth annular groove, and a sealing ring is provided in the seventh annular groove. When the piston 5 mates with the inner wall of the protruding cylinder 3, the inner wall of the protruding cylinder 3 compresses the sealing ring, thereby sealing the connection between the piston 5 and the protruding cylinder 3.

[0056] For the sealing of the connection between the inner wall of the gas piston 5 and the outer cylindrical surface of the second cylindrical section: an eighth annular groove is provided on the inner wall of the gas piston 5. Preferably, there are two eighth annular grooves. A sealing ring is provided in the eighth annular groove. The sealing ring is squeezed by the outer cylindrical surface of the second cylindrical section to achieve the sealing between the second cylindrical section and the gas piston 5.

[0057] The protruding cylinder 3 is fixedly connected to the end cap 2. Specifically, the end of the protruding cylinder 3 is provided with a first flange, and the end cap 2 is provided with a second flange on the outer side of the oil tank cylinder 1. The first flange and the second flange are connected by bolts. For the sealing of the connection between the protruding cylinder 3 and the end cap 2: a ninth annular groove is provided on the end face of the first flange and the second flange that are in contact. The ninth annular groove surrounds the second cylindrical section, and a sealing ring is provided in the ninth annular groove. When the first flange and the second flange are tightened with bolts, the second flange squeezes the sealing ring located in the ninth annular groove, thereby achieving a seal between the protruding cylinder 3 and the oil tank body.

[0058] In this embodiment, a sixth and a seventh annular groove are provided on the outer wall of the gas piston 5. A guide strip is placed in the sixth annular groove, and a sealing ring is placed in the seventh annular groove. An eighth annular groove is provided on the inner wall of the gas piston 5, and a sealing ring is placed in the eighth annular groove. A ninth annular groove is opened on the first flange extending from the cylinder 3, and a sealing ring is placed in the ninth annular groove. Through the cooperation of the above structures, the gas chamber forms a closed space with good sealing performance, ensuring the realization of pressure holding and pressurization.

[0059] The outer diameter of the third cylindrical section is equal to the inner diameter of the protruding cylinder 3. A high-pressure oil chamber is located between the third cylindrical section and the piston 5. To ensure the sealing of the high-pressure oil chamber, a tenth annular groove and an eleventh annular groove are provided on the outer cylindrical surface of the third cylindrical section. Two tenth and eleventh annular grooves are provided, with two eleventh annular grooves located between the two tenth annular grooves. A guide band is provided inside the tenth annular groove, and a sealing ring is provided inside the eleventh annular groove, effectively preventing oil leakage from the connection between the third cylindrical section and the inner wall of the protruding cylinder 3. In this embodiment, the third cylindrical section essentially functions as a piston.

[0060] Understandably, the space enclosed by the third cylindrical section, the air piston 5, and the protruding cylinder 3 is a high-pressure oil chamber. Guide belts and sealing rings are installed in both the third cylindrical section and the air piston 5 to achieve a good sealing effect in the high-pressure oil chamber, thus ensuring the realization of self-pressure holding and self-pressure boosting.

[0061] In this embodiment, the self-pressurizing oil tank adopts a floating gas piston 5 design, which uses high-pressure gas as the pressurizing medium during non-working stages. This ensures that the hydraulic pump can smoothly start up by drawing oil, eliminating the need for an additional accumulator as a pressure-holding device and reducing the requirement for additional components.

[0062] The self-pressurizing oil tank also includes a high-pressure end cap 9, which is installed at the end of the protruding cylinder 3. A third through hole is provided along its length, penetrating both ends. Specifically, the high-pressure end cap 9 includes a connecting part and a cylindrical part. The connecting part has external threads and connects to the protruding cylinder 3. One end of the cylindrical part is not connected to the connecting part, and the other end has an oil pipe connector. One end of a fourth cylindrical section is connected to the third cylindrical section, and the other end is located in the third through hole and / or the inner cavity of the protruding cylinder 3. The outer diameter of the fourth cylindrical section is smaller than the inner diameter of the protruding cylinder 3 and equal to the diameter of the third through hole. The space between the third cylindrical section and the connecting part is the second cavity, that is, the inner cavity of the protruding cylinder 3 is divided into a second cavity, a high-pressure oil cavity, and a gas cavity. The space between the fourth cylindrical section and the high-pressure end cap 9 is a cavity. To prevent high-pressure oil from entering, a twelfth annular groove is provided on the outer cylindrical surface of the fourth cylindrical section. A sealing ring is provided in the twelfth annular groove to form a seal, effectively preventing high-pressure oil from leaking from the end cap 9 into the cavity between the end cap 9 and the piston rod 4.

[0063] In this embodiment, when the main piston 6 moves to the right (first chamber) under the pressure in the low-pressure oil chamber, it drives the piston rod 4 to gradually move to the right; when the third cylindrical section of the piston rod 4 moves to the left (second chamber) under the pressure in the high-pressure oil chamber, it drives the main piston 6 to move to the left; the gas piston 5 is slidably connected to the second cylindrical section of the piston rod 4, and when the forces at both ends of the gas piston 5 are unbalanced, it will slide along the second cylindrical section.

[0064] To inject oil into the high-pressure oil chamber, an oil passage hole is provided along the axis of the piston rod 4. This oil passage hole penetrates the third and fourth cylindrical sections and extends to a portion of the second cylindrical section. A fourth through hole is provided radially along the second cylindrical section, close to the third cylindrical section and communicating with the oil passage hole. An oil pipe connector at the end of the high-pressure end cap 9 is connected to an external high-pressure oil circuit. High-pressure oil entering from the oil pipe connector flows through the third through hole, the oil passage hole, and the fourth through hole into the high-pressure oil chamber. To supply oil to the low-pressure oil chamber, such as... Figure 3 As shown, the end cap 2 is equipped with an oil injection valve 18, through which oil is injected into the low-pressure oil chamber.

[0065] To limit the pressure of the oil in the high-pressure oil chamber and prevent system overpressure, a pressure relief pipe 10, preferably a steel pipe, is also included. One end of the pressure relief pipe 10 is connected to the oil tank cylinder 1, and the other end is connected to the end of the high-pressure end cover 9 with an oil pipe connector. A high-pressure relief valve 11.1 is provided at the connection end between the pressure relief pipe 10 and the high-pressure end cover 9. When the system is overpressured, the high-pressure relief valve 11.1 opens, and the high-pressure oil in the high-pressure chamber flows into the low-pressure oil chamber through the pressure relief pipe 10 to relieve pressure. A low-pressure relief valve 11.2 is provided on the end cover 2. The pressure in the low-pressure oil chamber is controlled by the low-pressure relief valve 11.2. If the low-pressure oil chamber is overpressured, the low-pressure relief valve 11.2 opens, and the low-pressure oil flows out to the outside to relieve pressure. Figure 3 As shown, the end cap 2 is also equipped with an oil supply connector 17.1 and an oil return connector 17.2.

[0066] To supply air to the air chamber, the first flange is provided with an air supply channel that communicates with the air chamber. An inflation valve 16 is also provided on the first flange, communicating with the air supply channel. Air is supplied to the air chamber through the inflation valve 16. It is important to note that the air supply channel should avoid the ninth annular groove.

[0067] Combination Figure 2 and Figure 3 As shown, the self-pressurizing oil tank also includes a displacement sensor 12, a high-pressure sensor 13.1, a low-pressure sensor 13.2, a pneumatic pressure sensor 14, and a temperature sensor 15. One end of the displacement sensor 12 is located outside the oil tank cylinder 1 and connected to the displacement sensor end cap 8. The other end passes through a blind hole in the piston rod 4. The blind hole is set along the axis of the piston rod 4, passes through the first cylindrical section, and extends to a portion of the second cylindrical section. It should be noted that the oil passage hole is not connected to the blind hole. The high-pressure sensor 13.1 is located on the high-pressure end cap 9, specifically at the oil pipe connector end. The low-pressure sensor 13.2, the pneumatic pressure sensor 14, and the temperature sensor 15 are located on the end cap 2. The low-pressure sensor 13.2 and the temperature sensor 15 are used to measure the pressure and temperature in the low-pressure oil chamber, respectively. The pneumatic pressure sensor 14 is used to measure the pressure in the air chamber. Therefore, the pneumatic pressure sensor 14 is located on the first flange and is connected to the air supply channel.

[0068] In this embodiment, multiple sensors are used to monitor the state of various media within the self-pressurizing oil tank. The high-pressure sensor 13.1, low-pressure sensor 13.2, air pressure sensor 14, and displacement sensor 12 form redundancy; if any sensor fails, the data can be indirectly calculated using information from the other three sensors, avoiding data loss due to sensor failure. Air pressure sensor 14 and high-pressure sensor 13.1 simultaneously detect the pressure on both sides of the air piston 5. This prevents the air piston 5 from moving to its limit position and causing pressure imbalance when oil or gas leaks, thus avoiding the inability to detect leaks caused by short-term system pressure maintenance and improving fault detection capabilities.

[0069] This embodiment integrates the accumulator with the fuel tank, reducing the number of components and improving system integration; it also sets up multiple sensors for multi-parameter redundant sensing, improving system detection capabilities and adding redundant detection functions.

[0070] This invention utilizes air pressure as a low-pressure booster during system startup, reducing the need for an additional accumulator. Furthermore, a redundant sensor network of multiple sensors enables real-time monitoring of high-pressure and low-pressure oil, air pressure, and piston displacement, thus fully reflecting the tank's operating status and facilitating commissioning and operation.

[0071] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressurization method for a composite sensing self-pressure maintaining self-pressurizing oil tank, characterized in that, The steps include: Step 1: Injecting low-pressure oil into the low-pressure oil chamber and filling the gas chamber with high-pressure gas to initially compress the low-pressure oil and perform a first pressurization; Step 2: Injecting high-pressure oil into the high-pressure oil chamber for a second pressurization, thereby achieving the rated pressurization function. The composite sensing self-pressure maintaining self-pressurizing oil tank includes an oil tank body, a piston, and an extended cylinder (3). The piston includes a piston rod (4), a gas piston (5), and a main piston (6). The oil tank body includes an oil tank cylinder (1), an end cap (2), and a displacement sensor end cap (8). The end cap (2) and the displacement sensor end cap (8) are respectively installed on both ends of the oil tank cylinder (1). The piston rod (4) includes a first cylindrical section, a second cylindrical section, a third cylindrical section, and a fourth cylindrical section connected in sequence. The chamber between the main piston (6) and the end cap (2) is a low-pressure oil chamber. The first cylindrical section is connected to the main piston (6). One end of the second cylindrical section is located in the low-pressure oil chamber, and the other end is located in the inner cavity of the extended cylinder (3). The main piston (6) moves within the oil tank cylinder (1). The gas piston (5) and the end cap (2) form a gas chamber. The third cylindrical section and the gas piston (5) form a high-pressure oil chamber. The gas piston (5) and the second cylindrical section can slide relative to each other.

2. The pressurization method for the composite sensing self-pressure maintaining type self-pressurizing oil tank according to claim 1, characterized in that, In step 2, if the high-pressure oil chamber is overpressurized, the high-pressure oil in the high-pressure oil chamber will flow into the low-pressure oil chamber to release the pressure.

3. The pressurization method for the composite sensing self-pressure maintaining type self-pressurizing oil tank according to claim 2, characterized in that, In step 2, if the low-pressure oil chamber is overpressurized, the low-pressure oil will flow out to the outside to relieve the pressure.

4. The pressurization method for the composite sensing self-pressure maintaining type self-pressurizing oil tank according to any one of claims 1-3, characterized in that, The main body of the oil tank is provided with a main piston (6), which divides the inner cavity of the oil tank body into the low-pressure oil chamber and the first chamber.

5. The pressurization method for the composite sensing self-pressure maintaining type self-pressurizing oil tank according to claim 1, characterized in that, The first cavity is located between the main piston (6) and the displacement sensor end cap (8).

6. The pressurization method for the composite sensing self-pressure maintaining self-pressurizing oil tank according to claim 1, characterized in that, The composite sensing self-pressure maintaining self-pressurizing oil tank also includes a high-pressure end cap (9), which covers one end of the protruding cylinder (3), and the other end of the protruding cylinder (3) is connected to the end cap (2).

7. The pressurization method for the composite sensing self-pressure maintaining type self-pressurizing oil tank according to claim 1, characterized in that, The end cap (2) is equipped with a low-pressure sensor (13.2), a gas pressure sensor (14), and a temperature sensor (15).

8. The pressurization method for the composite sensing self-pressure maintaining type self-pressurizing oil tank according to claim 6, characterized in that, The high-pressure end cap (9) is equipped with a high-pressure sensor (13.1).

9. The pressurization method for the composite sensing self-pressure maintaining type self-pressurizing oil tank according to claim 1, characterized in that, The displacement sensor end cap (8) is provided with a displacement sensor (12).

Images