High-low-temperature-resistant high-pressure metal piston energy accumulator for spaceflight

Abstract

The invention discloses a high-low-temperature-resistant high-pressure metal piston energy accumulator for spaceflight, and relates to the technical field of energy storage equipment. Comprising a containing cavity formed by welding a cylinder and a bottom cover, a metal film piston is arranged in the containing cavity in a sliding mode and is made of all-metal materials, and the two sides of the metal film piston correspond to an air pressure cavity and a hydraulic cavity respectively; deformable lips which expand and incline outwards are arranged on the side, located on the air pressure cavity, of the metal film piston and on the side, located on the hydraulic cavity, of the metal film piston, and in the working state, the circumferential contact faces arranged at the tail ends of the deformable lips are tightly attached to the inner wall of the cylinder body to achieve double sealing. The metal film piston of an all-metal structure is adopted, self-sealing is achieved through pressure in the assembling and using process, meanwhile, the closed air cavity is designed to protect the lip edge, and over-deformation is prevented. The device has the advantages of long-time storage and sealing, lifelong maintenance-free property, extreme weather resistance, high pressure, large capacity and light weight.

Description

Technical Field

[0001] This invention relates to the field of piston accumulator technology, specifically to a metal piston accumulator for aerospace applications that is resistant to high and low temperatures and high pressures. Background Technology

[0002] Currently, both domestically produced large passenger aircraft and military aircraft in China use accumulators in their flight control hydraulic systems to ensure flight stability. These accumulators store energy, absorb shocks, and eliminate pulsations. However, as aircraft performance requirements become increasingly stringent and lightweight, traditional accumulators are no longer sufficient to meet current demands, which include, but are not limited to: High and low temperatures: above +300 degrees Celsius, below -55 degrees Celsius; Lifespan of 40 years or more; Lifetime maintenance-free; Lightweight requirements.

[0003] Existing piston accumulators and diaphragm accumulators are widely used, but each has its own significant drawbacks. Piston accumulators, relying on non-metallic sealing rings, often suffer from wear and leakage, high maintenance costs, and poor adaptability to extreme environments. Specifically: Wear and leakage occur during use; because the relative movement between the piston and cylinder separates the gas and liquid, the non-metallic seal is prone to wear under high pressure, high frequency cycling or lateral force conditions, resulting in gas and liquid leakage, causing insufficient gas pressure or air bubbles to mix into the liquid, which can cause serious performance damage to the aircraft.

[0004] When the seals wear out, they need to be replaced. This usually requires removing the entire accumulator from the hydraulic system, depressurizing, draining oil and nitrogen, replacing the seals, and then reinstalling, refilling, and testing. This process is time-consuming and costly, and usually requires the system to be shut down. In special circumstances, this can seriously affect the execution of emergency flight missions.

[0005] Non-metallic seals typically have a limited lifespan. However, with the continuous improvement of aircraft performance, non-metallic seals can no longer fully cover extreme climates, such as environments below -55 degrees Celsius and operating temperatures above 300 degrees Celsius around the engine.

[0006] For diaphragm accumulators, the following problems exist due to the inherent structural limitations of the bellows: (1) Limited volume and pressure range: In order to ensure that the bellows is not crushed or excessively deformed when fully compressed, and considering the end connection structure, the diaphragm box cannot be completely flattened, and there is a certain "ineffective" or "dead zone" volume; its pressure bearing capacity is closely related to its diameter, wall thickness and corrugation design, so it is very difficult to design a diaphragm box with ultra-high pressure and large capacity.

[0007] Unrepairability: Once the metal bellows (diaphragm) suffers fatigue cracking or weld failure, it is usually unrepairable and the entire accumulator assembly needs to be replaced, resulting in very high repair costs.

[0008] With the same overall dimensions, its volume and weight increase by about 30% compared to a piston accumulator, which poses a significant problem for the maneuverability of current high-performance aircraft and does not meet the industry's weight reduction requirements.

[0009] Based on the above issues, we provide a high-pressure, high-low temperature, long-life, maintenance-free accumulator. Summary of the Invention

[0010] The purpose of this invention is to provide a metal piston accumulator for aerospace applications that is resistant to high and low temperatures and high pressures to solve the problems mentioned in the background art. Compared with the prior art, this invention not only solves the disadvantages of the non-metallic sealing structure of existing piston accumulators, such as easy damage and the need for maintenance, but also solves the problems of small capacity, inability to withstand high pressure, and heavy weight of diaphragm accumulators. It has the advantages of long-term sealed storage, lifetime maintenance-free operation, resistance to extreme weather, high pressure, large capacity, and light weight.

[0011] The present invention can be achieved by the following technical solution: an aerospace-grade high-low temperature and high-pressure resistant metal piston accumulator, including a receiving chamber, in which a metal thin film piston with a shape matching the receiving chamber is slidably disposed, the metal thin film piston is made of all-metal material, the metal thin film piston divides the space inside the receiving chamber into a hydraulic chamber and a pneumatic chamber, the pneumatic chamber is filled with gas to a certain pressure and then sealed, and the hydraulic chamber is connected to the flight control hydraulic system of the aircraft. The metal diaphragm piston has deformable lips on both sides, and the side located in the hydraulic chamber is marked as... Deformable lip edge A deformable lip forms a space between it and the inner wall of the hydraulic cavity. The sealed air chamber; the side closest to the air pressure chamber is marked as Deformable lip edge A deformable lip forms a space between it and the inner wall of the air pressure chamber. Closed air chamber; In operation, the two deformable lips and the two sealed air chambers formed between them achieve a seal on both sides of the metal film piston.

[0012] A further technical improvement of the present invention is that: the metal film piston is provided with a connection to the... Closed air chamber and The passage of a sealed air chamber; when the pressure value of the hydraulic chamber is greater than that of the air chamber. The sealed air chamber is compressed. The increased contact area between the deformable lip and the inner wall of the hydraulic cavity enhances sealing performance. Gas enters the sealed air chamber Sealed air chamber, The reduced contact area between the inner walls of the sealed air chamber and the pressure chamber decreases the friction area. The air pressure inside the sealed air chamber increases, decreases The pressure difference on both sides of the deformable lip prevents excessive pressure difference from causing... Deformable lip edge damage; Similarly, when the pressure in the pneumatic chamber is greater than that in the hydraulic chamber, The sealed air chamber is compressed. The contact area between the deformable lip and the inner wall of the air pressure chamber is increased. Gas enters the sealed air chamber Sealed air chamber, The contact area between the inner walls of the sealed air chamber and the hydraulic chamber is reduced. The air pressure inside the sealed air chamber increases, decreases The pressure difference on both sides of the deformable lip prevents excessive pressure difference from causing... Deformable lip edge damage.

[0013] A further technical improvement of the present invention is that the channel is located on the outer wall or inside the metal film piston, and its structural form includes a connecting groove, a connecting hole, and a buried connecting pipe. The specific location and structural form can be selected according to the actual situation.

[0014] A further technical improvement of the present invention is that: the end of the metal film piston near the hydraulic chamber is end, End and The deformable lip edge forms a buffer space. The end is equipped with a flow channel, which connects to the buffer space; When the pneumatic chamber is filled with air, the flow channel is used for leak detection; when the hydraulic chamber is filled with oil, the flow channel guides the oil into the buffer space, allowing the oil to act quickly and evenly on the surface. The sidewalls of the deformable lip prevent sudden pressure impacts on the deformable lip, protecting it from damage caused by impacts.

[0015] A further technical improvement of the present invention is that: when under pressure during operation, the volume of the two sealed air chambers changes by 10% to 20%, preventing the deformable lip from deforming excessively under excessive load, thus providing a protective function.

[0016] A further technical improvement of the present invention is that the assembly gap between the circumferential contact surface of the deformable lip and the inner wall of the cylinder is set to 0.05mm~0.1mm, so as to minimize frictional loss while ensuring the sealing performance of the metal film piston.

[0017] A further technical improvement of the present invention is that the angle θ between the deformable lip and the central axis of the metal film piston, the effective lever arm length L from the root of the deformable lip to the contact point on the inner wall of the cylinder, and the width h and roughness Ra of the circumferential contact surface can be set according to the design pressure requirements.

[0018] A further technical improvement of the present invention is that, when the inflation pressure is set to 14 MPa, the included angle θ is set between 3° and 10°, the effective lever arm length is set between 12.5 mm and 16 mm, the width h of the circumferential contact surface is set between 2 mm and 4 mm, and the roughness Ra of the circumferential contact surface is between 0.4 and 0.8.

[0019] A further technical improvement of the present invention is that the receiving chamber is formed by welding a cylinder and a bottom cover, the pneumatic chamber is located on the side adjacent to the bottom cover, and the hydraulic chamber is located on the side away from the bottom cover, which can minimize the possibility of leakage in the area connected to the flight control hydraulic system.

[0020] A further technical improvement of the present invention is that the outer edge of the deformable lip is provided with a rounded corner transition to ensure a sealing connection effect.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The metal film piston used in this invention features an integrated structural design, achieving sealing without redundant sealing rings. The piston is entirely made of metal, exhibiting high and low temperature resistance, allowing for prolonged use in both high and low temperature environments. Furthermore, the material's low elastic modulus facilitates lip expansion and deformation during inflation. Simultaneously, the sealing mechanism of this metal film piston results in a lightweight structure, avoiding the sacrifice of weight and volume control associated with redundant sealing designs or increased structural dimensions to match pressure requirements. This overcomes the drawbacks of large space occupation and bulky equipment.

[0022] The metal film piston of the present invention displaces under unbalanced pressure on both sides. During the displacement process, the friction on the deformable lips on both sides is asymmetrical. Due to its working characteristics, friction loss occurs frequently during its service life. The side with relatively higher pressure is more tightly sealed, while the deformable lip on the side with lower pressure is protected by friction, which greatly reduces the degree of wear. It is equivalent to halving the number of heavy-load frictions on each deformable lip, turning it into light-load friction, thereby forming friction protection and reducing friction loss.

[0023] 3. The metal film piston of the present invention uses deformable lips to achieve self-compensating sealing under high pressure. The assembly gap is automatically compensated by the deformation of the lips, ensuring sealing reliability under high pressure and extreme high and low temperature environments. The double deformable lips expand radially under pressure and fit tightly against the inner wall of the cylinder, eliminating the risk of wear and leakage of non-metallic sealing rings.

[0024] 4. In this invention, the metal film piston has a channel on the outer peripheral wall in the middle, which reduces the contact area between it and the cylinder, greatly reducing friction loss and thus extending service life. At the same time, this piston design does not have "ineffective" or "dead zone" volume, and the piston can theoretically slide to the full stroke, resulting in high volume utilization and a significant reduction in structural weight.

[0025] 5. In this invention, the two deformable lips form two sealed air chambers connected to the receiving chamber. When under working pressure, the volume can be compressed by 10% to 20% to balance the pressure difference on both sides of the lips, thereby preventing excessive deformation and cracking of the lips, dynamically protecting the structural strength and reducing maintenance costs.

[0026] 6. This invention achieves gas guidance and leak detection during the assembly sealing process by setting a flow channel. At the same time, when the accumulator is working, the oil entering the hydraulic chamber can act quickly and evenly on the deformable lip on that side, thereby eliminating the risk of failure caused by uneven sealing of the hydraulic chamber and making the entire energy storage process stable without generating impact vibration. Attached Figure Description

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0028] Figure 1 This is a cross-sectional view of the overall installation structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the metal thin film piston of the present invention; Figure 3 This is a cross-sectional schematic diagram of the metal thin film piston of the present invention; Figure 4 This is a schematic diagram of the pressure balance of the metal film piston of the present invention; Figure 5 This is a schematic diagram simulating the deformation of the variable lip on the gas pressure side after assembly and sealing according to the present invention; Figure 6 This is a schematic diagram simulating the deformation of the variable lips on both sides of the present invention in the working state.

[0029] In the diagram: 1. Cylinder; 2. Bottom cover; 3. Metal film piston; 301. Deformable lip; 302. Flow groove; 303. Channel; 304. Buffer space. Detailed Implementation

[0030] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0031] Please see Figure 1 As shown, an aerospace-grade high-low temperature and high-pressure resistant metal piston accumulator includes a housing chamber with openings at both ends, consisting of a cylinder 1 and a bottom cover 2. A metal film piston 3 is slidably disposed within the housing chamber. The metal film piston is made of all-metal material, and considering its operating environment, it is generally made of copper and copper alloys, titanium and titanium alloys, nickel-based high-temperature alloys, etc., selected according to different working conditions and working media. The metal film piston 3 divides the housing chamber into a pneumatic chamber and a hydraulic chamber, which are used to inject gaseous media and liquid media, respectively. The gaseous media is generally nitrogen, and the liquid media is generally hydraulic oil.

[0032] Specifically, to reduce the risk of leakage, the bottom cover 2 is welded and fixed to the cylinder 1, and the chamber on the side closest to the bottom cover 2 is designated as a pneumatic chamber. During assembly, a certain pressure of gas is injected into the pneumatic chamber and then sealed. The chamber on the other side of 2, away from the bottom cover, is designated as a hydraulic chamber, and hydraulic oil is circulated into it during operation. like Figure 2 As shown, the main body of the metal film piston 3 is shaped to match the receiving chamber, and in this embodiment, it is set as a cylinder. Figure 1 In the shown installation posture, the top and bottom of the metal film piston 3 are the hydraulic chamber and the pneumatic chamber, respectively. A deformable lip 301 is provided on both sides of the metal film piston 3. The deformable lip 301 located on the hydraulic chamber side is marked as... Deformable lip, the deformable lip 301 located on one side of the air pressure chamber is marked as Deformable lip edge; like Figure 3 As shown, the deformable lip 301 expands outward at a certain angle to the central axis of the metal film piston 3. This angle is marked as angle θ. Taking the contact point between the deformable lip 301 and the inner wall of the cylinder 1 as the fulcrum, the effective lever arm length formed from the fulcrum to the root of the deformable lip 301 in any radius section is L. To ensure the effective sealing of the deformable lip 301, the outer edge of the deformable lip 301 is provided with a rounded transition. At the end of the rounded transition, the outer side of the deformable lip 301 is provided with a circumferential contact surface with a vertical length of h parallel to the central axis. The roughness of this circumferential surface is set as Ra. Different operating pressure requirements can be specifically customized according to the above specifications. In this embodiment, in order to meet the pressure requirements of the aircraft flight control hydraulic system of more than 28MPa, the θ angle is set to a value between 3° and 10°; the effective lever arm length L is set to 12.5mm to 16mm; the width h of the circumferential contact surface is set to 2 to 4mm, and its roughness Ra is set to 0.4 to 0.8; thereby meeting the radial expansion deformation and sealing requirements after expansion deformation under the corresponding pressure requirements.

[0033] like Figure 4As shown, during the assembly and sealing process, the gas chamber located in the pressure chamber... The deformable lip, under air pressure, tightly adheres to the side wall of the receiving chamber, completing the seal on that side. After the air sealing is complete, liquid medium (hydraulic oil) is guided into the hydraulic chamber, causing the hydraulic chamber pressure to act on... The deformable lip sidewall allows it to deform and expand to fit tightly against the sidewall of the receiving chamber, thus achieving a seal at one end of the hydraulic chamber. In the working state, the two deformable lips 301 cooperate with the sidewall of the receiving chamber to complete the double-sided sealing of the accumulator. Because the deformable lip 301 expands and tilts outward at a certain angle. A deformable lip forms a space between the inner wall of the hydraulic cavity and the surface of the hydraulic chamber. Sealed air chamber, The deformable lip forms a space between the inner wall of the air pressure chamber and the air pressure chamber. A sealed air chamber is provided in the main body of the metal film piston 3, with a channel 303 connecting the two sealed air chambers; During the operation of the accumulator, there are equilibrium and imbalance states. In the equilibrium state, the pressure value of the hydraulic chamber is equal to the pressure value of the pneumatic chamber. Closed air chamber and The air pressure in the sealed air chamber is the same; when the balance is broken and the state changes to an unbalanced state, the pressure in the hydraulic chamber changes first, and the metal diaphragm piston 3 needs to move accordingly to reach a new equilibrium state: Specifically, if the pressure in the hydraulic chamber increases, and the pressure value in the hydraulic chamber is greater than that in the pneumatic chamber, then... The deformable lip is further compressed. The increased contact area between the deformable lip and the inner wall of the hydraulic cavity improves sealing performance; simultaneously, The volume of the sealed air chamber is compressed, and the two sealed air chambers are in a connected state. Gas enters the sealed air chamber Sealed air chamber, The gas in the sealed air chamber is drawn from the inside. The deformable lip edge forms a compression, making The reduced contact area between the deformable lip and the inner wall of the air pressure chamber decreases the friction area and reduces frictional loss; furthermore, due to The air pressure inside the sealed air chamber increases, decreases The pressure difference on both sides of the deformable lip prevents excessive pressure difference from causing... The deformable lip is damaged; in summary, during the process of the gold thin-film piston 3 compressing and moving the air pressure chamber until a new equilibrium is reached, The deformable lip is protected.

[0034] Similarly, if the pressure in the hydraulic chamber decreases and the pressure in the pneumatic chamber is greater than that in the hydraulic chamber, The pressure on the deformable lip is reduced. The contact area between the deformable lip and the inner wall of the hydraulic cavity is correspondingly reduced, thereby reducing the friction area and lowering friction loss; at the same time, The volume of the sealed air chamber expands, and the two sealed air chambers are in a connected state. The gas inside the sealed air chamber will enter The sealed air chamber makes The pressure difference across the deformable lip increases, thus... The increased contact area between the deformable lip and the inner wall of the air pressure chamber improves sealing performance; furthermore, due to The air pressure inside the sealed air chamber increases, decreases The pressure difference on both sides of the deformable lip prevents excessive pressure difference from causing... The deformable lip is damaged; in summary, during the process of the gold film piston 3 compressing and moving the hydraulic chamber until a new equilibrium is reached, The deformable lip is protected.

[0035] From the above, it can be concluded that during each movement of the metal film piston 3, its Deformable lips and The deformable lip is subjected to asymmetrical frictional forces. Due to the frequent movement of the metal film piston 3 during its service life, it can minimize piston wear and extend its service life compared to ordinary pistons.

[0036] Specifically, the structure of the channel 303 connecting the two sealed air chambers can be a connecting hole, a connecting groove (arc groove, spiral groove, and flat groove, etc.), or a buried connecting pipe, etc. The specific structural form is determined according to the usage requirements. The channel 303 can be directly set on the outer wall of the metal film piston 3, or it can be buried inside the metal film piston 3 while ensuring connectivity. Generally, in order to facilitate processing and reduce the friction area between the metal film piston 3 and the receiving chamber, we choose a channel structure with a flat groove on the outer side of the middle of the metal film piston 3. The state shown in the figure in this application is the state in which the channel 303 adopts the flat groove structure.

[0037] More often, the end closer to the hydraulic chamber is end, End and The deformable lip forms a buffer space made of 304 stainless steel. The end is provided with a flow channel 302, which connects to the buffer space 304. When the pneumatic chamber is inflated, the flow channel 302 is used to guide and release the gas flowing through the assembly gap during inflation and to detect leaks. The leak detection process occurs during the initial assembly process. During assembly, the pneumatic chamber is inflated to 14 MPa. If the sealed pneumatic chamber fails to seal, the gas inside the pneumatic side will flow out through the flow channel, causing a gas leak. After the pneumatic chamber inflation and leak detection are completed, it is sealed. When the hydraulic chamber is filled with oil, the flow channel 302 is used to guide the oil into the buffer space 304, allowing the oil to act quickly and evenly on the... The sidewalls of the deformable lip prevent sudden pressure impacts on the deformable lip, protecting it from damage caused by impacts.

[0038] By ensuring that the assembly clearance between the circumferential contact surface of the deformable lip 301 on both the air pressure and hydraulic sides and the inner diameter of the cylinder 1 is 0.05~0.1mm, when the air pressure side reaches the set pressure, the deformation of the deformable lip 301 compensates for this assembly clearance, thereby achieving a sealing effect. Its directional deformation is as follows: Figure 5 As shown, an excessively large assembly clearance will increase the initial sealing pressure and worsen the sealing effect; an excessively small assembly clearance will increase the friction between the metal film piston 3 and the inside of the cylinder 1, thus increasing wear during the movement process.

[0039] When the accumulator is in a pressure equilibrium state, the air pressure acting on the inner side of the two deformable lips 301 in the two sealed air chambers is the same and uniform. The volume of the sealed air chamber under the specification parameters in this embodiment is about 5.83ml. When the accumulator enters the working state, the volume of the two sealed air chambers changes by 10% to 20% under the deformation of the corresponding deformable lips 301.

[0040] Working principle: Assembly sealing: The metal diaphragm piston 3, with the side having the flow groove 302 facing the cylinder 1, is first inserted, and then the bottom cover 2 is welded and fixed to the cylinder 1; after welding, air is injected and pressurized at one end of the air pressure chamber, and when the pressure reaches a certain value... The deformable lip expands and deforms outward under pressure, tightly fitting with the cylinder 1 to achieve an airtight seal. At the same time, a leak test is performed at the flow channel 302. After no leakage occurs at this location and the pressure in the air chamber is maintained stably for a period of time, an airtight seal is performed at one end of the air chamber interface. Energy storage buffer: When the accumulator is connected to the flight control hydraulic system, hydraulic oil enters the hydraulic chamber and acts on the metal diaphragm piston 3. The end then rapidly enters from the flow channel 302. End and Within the buffer space 304 between the deformable lips, the hydraulic pressure is applied evenly to the corresponding surfaces. The deformable lip sidewall deforms and expands to fit tightly against the cylinder 1 to achieve a seal; when a double seal is achieved, the deformation of the two deformable lips 301 of the metal film piston 3 is as follows: Figure 6 As shown; Furthermore, as the pressure in the hydraulic chamber changes, the metal film piston 3 slides and seals within the cylinder 1 until the pressure on both sides of the metal film piston 3 is balanced, thus completing the entire energy storage and buffering process.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A metal piston accumulator for aerospace applications, resistant to high and low temperatures and high pressures, characterized in that... Includes a receiving chamber, in which a metal film piston (3) with a shape matching the receiving chamber is slidably disposed. The metal film piston (3) is made of all-metal material. The metal film piston (3) divides the space inside the receiving chamber into a hydraulic chamber and a pneumatic chamber. The pneumatic chamber is filled with air to a certain pressure and then sealed. The hydraulic chamber is connected to the flight control hydraulic system of the aircraft. The metal film piston (3) has deformable lips (301) on both sides, and the side located in the hydraulic chamber is marked as... Deformable lip edge A deformable lip forms a space between it and the inner wall of the hydraulic chamber. A sealed air chamber; located at one end of the air pressure chamber, marked as Deformable lip edge A deformable lip forms a space between it and the inner wall of the air pressure chamber. Closed air chamber; In operation, the two deformable lips (301) and the two sealed air chambers formed between the receiving chamber achieve the sealing of both sides of the metal film piston (3).

2. The aerospace-grade high-temperature and high-pressure resistant metal piston accumulator according to claim 1, characterized in that, The metal film piston (3) is provided with a connection to the Closed air chamber and The passage of the sealed air chamber (303); When the pressure value of the hydraulic chamber is greater than that of the pneumatic chamber, The sealed air chamber is compressed. The contact area between the deformable lip and the inner wall of the hydraulic cavity is increased. Gas enters the sealed air chamber Sealed air chamber, The contact area between the inner walls of the sealed air chamber and the pressure chamber is reduced. The air pressure inside the sealed air chamber increases; When the pressure value of the pneumatic chamber is greater than that of the hydraulic chamber, The sealed air chamber is compressed. The contact area between the deformable lip and the inner wall of the air pressure chamber is increased. Gas enters the sealed air chamber Sealed air chamber, The contact area between the inner walls of the sealed air chamber and the hydraulic chamber is reduced. The air pressure inside the sealed air chamber increases.

3. The aerospace-grade high-temperature and high-pressure resistant metal piston accumulator according to claim 2, characterized in that, The channel (303) is located on the outer wall or inside the metal film piston (3), and its structural forms include the form of a connecting groove, a connecting hole, and a buried connecting pipe.

4. The aerospace-grade high-temperature and high-pressure resistant metal piston accumulator according to claim 1, characterized in that, The end of the metal film piston (3) near the hydraulic chamber is end, End and The deformable lip forms a buffer space (304). The end is provided with a flow channel (302), which is connected to the buffer space (304); When the pneumatic chamber is filled with air, the flow channel (302) is used for leak detection; when the hydraulic chamber is filled with oil, the flow channel (302) is used to guide the oil into the buffer space (304), so that the oil can act quickly and evenly on the surface. The sidewall of the deformable lip (301).

5. A high-temperature, low-temperature, high-pressure resistant metal piston accumulator for aerospace applications according to claim 1, characterized in that, When under pressure during operation, the volume of the two sealed air chambers changes by 10% to 20%.

6. The aerospace-grade high-temperature and high-pressure resistant metal piston accumulator according to claim 1, characterized in that, The assembly gap between the circumferential contact surface of the deformable lip (301) and the inner wall of the cylinder (1) is set to 0.05mm~0.1mm.

7. The aerospace-grade high-temperature and high-pressure resistant metal piston accumulator according to claim 1, characterized in that, The angle θ between the deformable lip (301) and the central axis of the metal film piston (3), the effective lever arm length L from the root of the deformable lip (301) to the contact point on the inner wall of the cylinder (1), the width h and roughness Ra of the circumferential contact surface can be set according to the design pressure requirements.

8. A high-temperature, low-temperature, high-pressure resistant metal piston accumulator for aerospace applications according to claim 7, characterized in that, When the inflation pressure is set to 14 MPa, the included angle θ is set between 3° and 10°, the effective lever arm length is set between 12.5 mm and 16 mm, the width h of the circumferential contact surface is set between 2 mm and 4 mm, and the roughness Ra of the circumferential contact surface is between 0.4 and 0.

8.

9. A high-temperature, low-temperature, high-pressure resistant metal piston accumulator for aerospace applications according to claim 1, characterized in that, The accommodating chamber is formed by welding a cylinder (1) and a bottom cover (2). The pneumatic chamber is located on the side adjacent to the bottom cover (2), and the hydraulic chamber is located on the side away from the bottom cover (2).

10. A high-temperature, low-temperature, high-pressure resistant metal piston accumulator for aerospace applications according to claim 1, characterized in that, The outer edge of the deformable lip (301) is provided with a rounded transition.

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