Low-noise gas spring composite piston self-pressurization oil tank

Abstract

A low-noise air spring composite piston self-pressurization oil tank relates to the field of ship equipment and comprises an oil tank shell, one end of the oil tank shell is connected with an oil tank end cover, the other end of the oil tank shell is connected with a piston baffle ring, an oil tank piston is arranged in the oil tank end cover and is sealed with the inner wall of the oil tank end cover, and an air cavity is formed between the oil tank piston and the oil tank end cover. An oil cavity is formed between the oil tank piston and the piston baffle ring, and the oil tank end cover is provided with an inflation nozzle so that air can be inflated into or deflated from the air cavity through the inflation nozzle. An oil outlet is formed in the middle of the piston baffle ring, a hydraulic valve block is further installed on the outer wall of the end, where the piston baffle ring is installed, of the oil tank shell, oil is contained in the hydraulic valve block, and the oil in the oil cavity enters the hydraulic valve block through the oil outlet; the air cavity is filled with high-pressure air through the inflation nozzle, so that the oil tank piston generates pressure on the oil; a supporting spring is further arranged between the oil tank piston and the oil tank end cover. The problems that a low-pressure pressurization oil tank of an existing low-noise electro-static pressure servo system leaks air for a long time, reliability is poor, and torsion friction vibration noise of a spring is large are solved.

Description

Technical Field

[0001] The invention designs a low-noise gas-spring composite self-pressurizing oil tank, which is mainly used for low-pressure oil storage and pressurization of low-noise electrostatic and hydraulic systems, and belongs to the field of ship equipment. Background Art

[0002] At present, booster tanks are divided into piston type and corrugated type. According to the boosting method, they can be divided into three categories: gas, spring or high-pressure liquid boosting. For piston type oil tanks, oil tanks that only use gas boosting have low operating noise, but gas leakage is difficult to avoid during long-term storage or operation. Gas leakage will cause the boosting pressure to decrease, affecting the mission reliability. Gas leakage will cause oil and gas mixing, affecting the working performance of the hydraulic system and even causing failures. Although the use of spring boosting has higher reliability, the boosting pressure is low; during the compression and extension of the spring, it is accompanied by torsional movement, resulting in severe friction between the spring end face and the support surface, producing obvious vibration noise, affecting the application in low-noise scenarios, and friction produces excess materials, which are easy to scratch the sealing surface of the oil tank and reduce the working reliability of the oil tank. High-pressure liquid boosting requires additional high-pressure oil, which limits its scope of application.

[0003] Chinese patent CN 106640782B discloses a self-pressurizing oil tank device, which adopts a bellows structure, relies on high-pressure oil and the elastic force of the bellows itself for pressurization, and needs to rely on the supply of external hydraulic oil.

[0004] Chinese patent CN103821779B discloses a self-pressurizing fuel tank, which is pressurized by a spring and relies on a mechanical structure to adjust the initial boost pressure to adapt to different working conditions, but the boost pressure is relatively low.

[0005] Chinese patent CN207935184U discloses a gas-liquid composite self-pressurizing oil tank, which uses high-pressure gas and high-pressure oil for composite pressurization and needs to rely on external high-pressure oil supply. Summary of the invention

[0006] The technical problem solved by the present application is: to overcome the deficiencies of the prior art and provide a low-noise gas spring composite piston booster oil tank structure to solve the problems of long-term air leakage, poor reliability and high spring torsional friction vibration noise of the existing low-noise electrostatic servo system low-pressure booster oil tank.

[0007] The low-noise gas spring composite piston self-pressurizing oil tank involved in the present invention is arranged on the low-pressure pipeline of the electrostatic servo system or the closed hydraulic system. It provides a boost pressure far higher than the atmospheric pressure for the low pressure of the hydraulic system, stores the oil of the closed system, compensates for the volume change of the oil caused by the temperature change of the system or the volume change of the hydraulic actuator, and prevents the hydraulic pump from sucking air.

[0008] The technical solutions provided by this application are as follows: The cam is provided with a plurality of camshafts, each of which ...

[0009] The outer wall surface of the oil tank piston is provided with an air-liquid isolation chamber, and the outer wall surface of the oil tank piston is also provided with an air chamber seal and an oil chamber seal. The air chamber seal is located on the side of the air-liquid isolation chamber facing the oil tank end cover, and the oil chamber seal is located on the side of the air-liquid isolation chamber facing the piston retaining ring.

[0010] A vent hole is provided on the oil tank housing, and the vent hole is located on the side of the air cavity seal facing the piston retaining ring. When working for a long time, the gas leaked from the air cavity through the air cavity seal will enter the gas-liquid isolation cavity and leak into the atmosphere through the vent hole.

[0011] The support spring is rotatably connected to the oil tank end cover via a rolling bearing, the inner ring of the rolling bearing is fixed to the oil tank end cover, and the outer ring of the rolling bearing is fixed to the support spring.

[0012] The support spring comprises a large spring and a small spring, the inner diameter of the large spring is larger than the outer diameter of the small spring, the rolling bearing comprises a large bearing and a small bearing, a raised portion is arranged on the inner wall of the oil tank end cover, the air inlet hole penetrates the raised portion, along the axis of the air inlet hole and pointing to the direction inside the oil tank shell, the raised portion comprises a first cylindrical mounting surface and a second cylindrical mounting surface with gradually decreasing outer diameters and coaxial, the inner ring of the large bearing is mounted in cooperation with the first cylindrical mounting surface, and the inner ring of the small bearing is mounted in cooperation with the second cylindrical mounting surface; the outer ring of the large bearing is fixedly connected with a large spring support ring, and the outer ring of the small bearing is fixedly connected with a small spring support ring, one end of the large spring contacts with the large spring support ring and the other end contacts with the oil tank piston, and one end of the small spring contacts with the small spring support ring and the other end contacts with the oil tank piston.

[0013] An annular groove is formed at one end of the oil tank piston facing the oil tank end cover, and the ends of the large spring support ring and the small spring support ring away from the spring support ring 71 are both clamped in the annular groove.

[0014] An inflation nozzle protective cover is installed on the side of the oil tank end cover away from the piston retaining ring. The inflation nozzle protective cover is arranged outside the inflation nozzle. The inflation nozzle protective cover is used to protect the inflation nozzle and perform secondary sealing on the gas leaking slightly from the inflation nozzle.

[0015] An end cover O-ring is installed on the outer circumferential surface of the oil tank end cover. The oil tank end cover is inserted into the oil tank shell. The end cover O-ring contacts the inner wall of the oil tank shell. The end cover O-ring is used for sealing between the oil tank end cover and the oil tank shell.

[0016] The outer wall surface of the oil tank piston is equipped with a supporting ring, which is made of non-metallic material and is in direct contact with the inner wall of the oil tank shell. The supporting ring is used to prevent the oil tank piston from directly contacting the oil tank shell.

[0017] An oil tank O-ring is installed on the outer wall surface of the oil tank housing, and the oil tank O-ring is used for sealing between the oil tank housing and the hydraulic valve block.

[0018] In summary, this application at least includes the following beneficial technical effects: (1) High pressure gas and strong spring are used to boost the pressure.

[0019] (2) Even if gas leaks during long-term operation, the lowest boost pressure can still be provided by relying solely on the spring, with high reliability.

[0020] (3) The gas-liquid isolation chamber can prevent high-pressure gas from leaking into the oil, solving the problem of oil-gas mixing causing hydraulic system failure during long-term operation.

[0021] (4) The rolling bearing supports the spring, eliminating the problem of severe vibration and noise caused by the torsional friction movement of the spring when the end face is in direct contact with the fixed surface of the tank end cover, and has an excellent vibration and noise effect.

[0022] (5) The oil tank piston is hollow in design, with the spring embedded inside, shortening the axial length and making the structure compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the working principle diagram of the low-noise gas spring composite piston self-pressurizing oil tank; Figure 2 It is a schematic cross-sectional structure diagram of an embodiment of a low-noise gas spring composite piston self-pressurizing oil tank.

[0024] Explanation of the accompanying symbols: 1. Fuel tank housing; 1-1. Vent; 1-2. Air cavity; 1-3. Oil cavity; 2. Fuel tank end cover; 3. Inflator nozzle cover; 4. Inflator nozzle; 5. Large bearing; 6. Small bearing; 7. Large spring support ring; 8. Small spring support ring; 9. Large spring; 10. Small spring; 11. End cover O-ring; 12. Fuel tank piston; 121. Air-liquid isolation chamber; 13. Support ring; 14. Air cavity seal (AQ seal ring); 15. Oil cavity seal (Weishi seal ring); 16. Fuel tank O-ring; 17. Piston retaining ring; 171. Oil outlet; 18. Vent; 51. Rolling bearing; 71. Spring support ring; 91. Support spring. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] The embodiment of the present application discloses a low-noise gas spring composite piston booster oil tank. The low-noise gas spring composite piston booster oil tank described in this patent is a device that uses high-pressure gas and a strong coil spring to jointly push the oil tank piston to achieve pressurization. It uses a gas-liquid isolation chamber to prevent oil and gas mixing, and uses a rolling bearing to support the coil spring to avoid severe friction between the coil spring and the supporting surface when it is twisted to generate vibration, thereby achieving silent operation.

[0027] The booster tank is equipped with three chambers, namely, the high-pressure gas chamber, the gas-liquid isolation chamber and the oil chamber. The three chambers are isolated by the tank piston and the seal inside. The high-pressure gas chamber is a sealed chamber, which is filled with high-pressure nitrogen to push the tank piston to increase pressure, and the self-closing inflation nozzle is used to achieve inflation and deflation. A strong spiral spring is also arranged inside the high-pressure gas chamber, one end of which is fixed on the gas chamber limit end cover, and the other end is fixed on the piston end, which is used to push the piston to increase pressure. A rolling bearing support structure is adopted between the spring and the gas chamber end cover. When the spring reciprocating telescopic motion produces torsion, the bearing rotor rotates accordingly, which can avoid the vibration noise and wear and tear of the spring torsion friction under the traditional support mode in which the fixed surface is in direct contact with the spring end surface. A gas sealing structure and an oil-liquid sealing structure are respectively arranged on the piston, and a part of the cavity is reserved between the two sealing structures to form a gas-liquid isolation chamber, which is connected to the atmosphere. When working for a long time, the high-pressure gas can only leak to the atmosphere, and cannot directly leak to the oil-liquid chamber. The oil chamber is directly connected to the oil outlet of the oil tank, and the oil pressurized by the high-pressure gas and the spring can communicate with the hydraulic system from the oil outlet.

[0028] The present invention provides an embodiment.

[0029] The working principle of the low noise gas spring composite piston self-pressurizing oil tank is as follows Figure 1. It mainly includes: an air filling nozzle 4, a fuel tank shell 1, an air cavity 1-2, a support spring 91, an air cavity seal 14, an air-liquid isolation cavity 121, a fuel tank piston 12, an oil cavity seal 15, an oil cavity 1-3, an oil outlet 171 and a rolling bearing 51. The rolling bearing 51 fills the air cavity 1-2 with high-pressure gas or releases air through the air filling nozzle 4. The high-pressure gas in the air cavity 1-2 pushes the fuel tank piston 12 to pressurize the oil in the oil cavity 1-3. An air cavity linear reciprocating air cavity seal 14 and an oil cavity linear reciprocating oil cavity seal 15 are respectively arranged on the fuel tank piston 12. The air cavity seal 14 and the oil cavity seal 15 form a sealed cavity with the fuel tank shell 1 to seal the high-pressure gas and the high-pressure oil respectively. A strong support spring 91 is arranged inside the air cavity to pressurize the oil tank piston 12. One end of the support spring 91 is supported by the outer ring of the rolling bearing 51, and the other end is supported by the end face of the oil tank piston 12. The inner ring of the rolling bearing 51 is connected to the oil tank housing 1. When the oil tank piston 12 moves left and right, the support spring 91 moves in a telescopic manner. At this time, the end of the support spring 91 produces a torsional movement, which drives the inner ring of the bearing 11 to rotate. An annular belt is arranged in the middle of the outer side of the oil tank piston 12 and the oil tank housing 1 to form a gas-liquid isolation chamber 121. A vent hole 1-1 is provided on the oil tank housing 1 corresponding to the left and right movement range of the oil tank piston 12. When working for a long time, the gas leaked from the air cavity 1-2 through the air cavity seal 14 will enter the gas-liquid isolation chamber 121 and leak to the atmosphere through the vent hole 1-1. Therefore, the gas in the air cavity 1-2 cannot enter the oil cavity 1-3, ensuring good oil-gas isolation performance. The oil cavity 1-3 is provided with an oil outlet 171, and the oil outlet 171 is connected to the hydraulic system to realize the oil in and out of the oil tank.

[0030] The schematic diagram of the low-noise gas spring composite piston self-pressurizing oil tank structure is as follows Figure 2 It is mainly composed of a fuel tank housing 1, a fuel tank end cover 2, a gas filling nozzle cover 3, a gas filling nozzle 4, a rolling bearing 51, a spring support ring 71, a support spring 91, an end cover O-ring 11, a fuel tank piston 12, a support ring 13, an air cavity seal 14, an oil cavity seal 15, a tank O-ring 16, a piston retaining ring 17, etc.

[0031] The oil tank housing 1 is used to withstand the internal high pressure. The oil tank end cover 2 is connected to one end of the oil tank housing 1. The piston retaining ring 17 is installed inside the other end of the oil tank housing 1. The oil tank end cover 2 is used to seal the air cavity and support other parts. The oil tank piston 12 is arranged in the oil tank end cover 2, and the oil tank piston 12 and the inner wall of the oil tank end cover 2 are sealed by the air cavity seal 14 and the oil cavity seal 15 to form an air cavity 1-2 between the oil tank piston 12 and the oil tank end cover 2. An oil chamber 1-3 is formed between the stopper ring 17, and the oil tank piston 12 is used to isolate the air chamber and the oil chamber; an air inlet hole is provided on the oil tank end cover 2, and the gas filling nozzle 4 is installed at the air inlet position of the oil tank end cover 2 to fill or release gas into the air chamber 1-2 through the gas filling nozzle 4. The side of the oil tank end cover 2 away from the piston stopper ring 17 is installed with a gas filling nozzle cover 3, and the gas filling nozzle cover 3 is covered on the outside of the gas filling nozzle 4. The gas filling nozzle cover 3 is used to protect the gas filling nozzle 4 and perform secondary sealing on the gas leaking from the gas filling nozzle 4. An oil outlet 171 is provided in the middle of the piston stopper ring 17, and the end of the oil tank housing 1 where the piston stopper ring 17 is installed is inserted into the hydraulic valve block, and there is oil in the hydraulic valve block. The oil in the oil chamber 1-3 enters the hydraulic valve block through the oil outlet 171. The inner diameter of the oil outlet 171 is smaller than the outer diameter of the oil tank piston 12 , so that the piston retaining ring 17 is used to limit the stroke of the oil tank piston 12 to prevent it from escaping from the oil tank housing 1 .

[0032] The outer wall surface of the oil tank piston 12 is provided with a gas-liquid isolation chamber 121, and the gas chamber seal 14 and the oil chamber seal 15 are provided on the outer wall surface of the oil tank piston 12. The gas chamber seal 14 is located on the side of the gas-liquid isolation chamber 121 facing the oil tank end cover 2, and the oil chamber seal 15 is located on the side of the gas-liquid isolation chamber 121 facing the piston retaining ring 17. The gas chamber seal 14 is an AQ sealing ring, and the oil chamber seal 15 is a Weishi sealing ring. The AQ sealing ring 14 is used to seal the gas chamber, and the Weishi sealing ring 15 is used to seal the oil chamber.

[0033] A vent hole 1-1 is provided on the oil tank housing 1, and the vent hole 1-1 is always located on the side of the air cavity seal 14 facing the piston retaining ring 17. When working for a long time, the gas leaked from the air cavity 1-2 through the air cavity seal 14 will enter the gas-liquid isolation cavity 121 and leak into the atmosphere through the vent hole 1-1.

[0034] The rolling bearing 51 includes a large bearing 5 and a small bearing 6, the spring support ring 71 includes a large spring support ring 7 and a small spring support ring 8, the support spring 91 includes a large spring 9 and a small spring 10, the inner wall of the oil tank end cover 2 is provided with a protrusion, and the air inlet hole passes through the protrusion; along the axis of the air inlet hole and pointing to the direction inside the oil tank housing 1, the protrusion has a first cylindrical mounting surface and a second cylindrical mounting surface with gradually decreasing outer diameters, the inner ring of the large bearing 5 is mounted in cooperation with the first cylindrical mounting surface, and the inner ring of the small bearing 6 is mounted in cooperation with the second cylindrical mounting surface; the large spring support ring 7 is fixedly connected to the outer ring of the large bearing 5, and the small spring support ring 8 is fixedly connected to the outer ring of the small bearing 6; one end of the large spring 9 is in contact with the large spring support ring 7, and the other end is in contact with the oil tank piston 12, and one end of the small spring 10 is in contact with the small spring support ring 8, and the other end is in contact with the oil tank piston 12. The large bearing 5 is used to release the torsional torque of the large spring, the small bearing 6 is used to release the torsional torque of the small spring, the large spring support ring 7 is used to connect the large spring 9 and the inner ring of the large bearing 5, the small spring support ring 8 is used to connect the small spring and the inner ring of the small bearing 6, and the large spring 9 and the small spring 10 jointly provide spring force for the oil tank piston 12.

[0035] An annular groove is formed at one end of the tank piston 12 facing the tank end cover 2, so that the tank piston 12 forms a hollow structure, and the ends of the large spring support ring 7 and the small spring support ring 8 away from the spring support ring 71 are both clamped in the annular groove.

[0036] The end cover O-ring 11 is embedded in the outer circumferential surface of the fuel tank end cover 2, and the fuel tank end cover 2 is inserted into the fuel tank housing 1. The end cover O-ring 11 is used for sealing between the fuel tank end cover 2 and the fuel tank housing 1; The support ring 13 is made of non-metallic material and is installed on the outer wall of the oil tank piston 12 . The support ring 13 is in direct contact with the inner wall of the oil tank housing 1 . The support ring 13 is used to prevent the oil tank piston 12 from directly contacting the oil tank housing 1 .

[0037] The oil tank O-ring 16 is arranged on the outer wall surface of the oil tank housing 1 , and the oil tank O-ring 16 contacts the inner wall of the hydraulic valve block. The oil tank O-ring 16 is used for sealing when the oil tank housing 1 is connected to the hydraulic valve block of the hydraulic system.

[0038] The main invention points are as follows: (1) High-pressure gas and a strong coil spring are used to push the oil tank piston to achieve pressure increase. If the gas leaks out during long-term operation, the spring alone can still provide the minimum pressure increase required by the hydraulic system.

[0039] (2) In order to solve the problem of vibration and noise caused by the torsional movement of the spring, a rolling bearing is used to support one end of the spring. When the spring is torsionally moved, the bearing rotor rotates accordingly, thereby avoiding the problem of vibration and noise caused by severe friction between the spring end face and its fixed support surface during torsional movement.

[0040] (3) A gas-liquid isolation chamber is set up to ensure that the gas cannot leak into the oil, thus avoiding the gas-liquid mixing problem.

[0041] (4) The fuel tank piston is designed as a hollow structure, and the booster spring is embedded inside, making the fuel tank small in size and light in weight.

[0042] The contents not described in detail in this application specification belong to the common knowledge of those skilled in the art.

[0043] The present application is described in detail above in conjunction with specific implementation methods and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that, without departing from the spirit and scope of the present application, a variety of equivalent replacements, modifications or improvements can be made to the technical solution of the present application and its implementation methods, all of which fall within the scope of the present application. The scope of protection of the present application shall be subject to the attached claims.

Claims

1. A low-noise gas spring composite piston self-pressurizing oil tank, characterized in that: The invention comprises an oil tank housing (1), an oil tank end cover (2), an oil tank piston (12) and a piston retaining ring (17); the oil tank end cover (2) is connected to one end of the oil tank housing (1); the piston retaining ring (17) is installed at the other end of the oil tank housing (1); the oil tank piston (12) is arranged in the oil tank end cover (2); and the oil tank piston (12) and the inner wall of the oil tank end cover (2) are sealed to form an air cavity (1-2) between the oil tank piston (12) and the oil tank end cover (2); and an oil cavity (1-3) is formed between the oil tank piston (12) and the piston retaining ring (17); an air inlet hole is opened on the oil tank end cover (2); and the oil tank end cover (17) is provided with an air inlet hole. 2) is provided with an air inlet nozzle (4) so ​​as to fill or release gas into the air cavity (1-2) through the air inlet nozzle (4); an oil outlet (171) is provided in the middle of the piston retaining ring (17); a hydraulic valve block is also provided on the outer wall of the end of the oil tank housing (1) where the piston retaining ring (17) is installed; oil is contained in the hydraulic valve block, and the oil in the oil cavity (1-3) enters the hydraulic valve block through the oil outlet (171); high-pressure gas is filled into the air cavity (1-2) through the air inlet nozzle (4) so ​​that the oil tank piston (12) generates pressure on the oil; and a support spring (91) is also provided between the oil tank piston (12) and the oil tank end cover (2).

2. A low-noise gas spring composite piston self-pressurizing oil tank according to claim 1, characterized in that: The outer wall surface of the oil tank piston (12) is provided with a gas-liquid isolation chamber (121), and the outer wall surface of the oil tank piston (12) is also provided with an air chamber seal (14) and an oil chamber seal (15), the air chamber seal (14) is located on the side of the gas-liquid isolation chamber (121) facing the oil tank end cover (2), and the oil chamber seal (15) is located on the side of the gas-liquid isolation chamber (121) facing the piston retaining ring (17).

3. A low-noise gas spring composite piston self-pressurizing oil tank according to claim 2, characterized in that: The oil tank housing (1) is provided with a vent hole (1-1), which is located on a side of the air cavity seal (14) facing the piston retaining ring (17). When the oil tank housing (1) is operated for a long time, gas leaking out of the air cavity (1-2) through the air cavity seal (14) will enter the air-liquid isolation cavity (121) and leak into the atmosphere through the vent hole (1-1).

4. The low-noise gas spring composite piston self-pressurizing oil tank according to claim 1, characterized in that: The support spring (91) is rotatably connected to the oil tank end cover (2) via a rolling bearing (51); the inner ring of the rolling bearing (51) is fixed to the oil tank end cover (2); and the outer ring of the rolling bearing (51) is fixed to the support spring (91).

5. A low-noise gas spring composite piston self-pressurizing oil tank according to claim 1 or 4, characterized in that: The support spring (91) comprises a large spring (9) and a small spring (10), the inner diameter of the large spring (9) is larger than the outer diameter of the small spring (10), the rolling bearing (51) comprises a large bearing (5) and a small bearing (6), the inner wall of the oil tank end cover (2) is provided with a protrusion, the air inlet hole penetrates the protrusion, along the axis of the air inlet hole and points to the inside of the oil tank housing (1), the protrusion has a first cylindrical mounting surface and a second cylindrical mounting surface with gradually decreasing outer diameters and coaxial, the large bearing (5) is The inner ring is mounted in cooperation with the first cylindrical mounting surface, and the inner ring of the small bearing (6) is mounted in cooperation with the second cylindrical mounting surface; the outer ring of the large bearing (5) is fixedly connected with a large spring support ring (7), and the outer ring of the small bearing (6) is fixedly connected with a small spring support ring (8); one end of the large spring (9) contacts the large spring support ring (7) and the other end contacts the oil tank piston (12); one end of the small spring (10) contacts the small spring support ring (8) and the other end contacts the oil tank piston (12).

6. A low-noise gas spring composite piston self-pressurizing oil tank according to claim 5, characterized in that: An annular groove is formed at one end of the oil tank piston (12) facing the oil tank end cover (2), and the ends of the large spring support ring (7) and the small spring support ring (8) away from the spring support ring 71 are both clamped in the annular groove.

7. The low-noise gas spring composite piston self-pressurizing oil tank according to claim 1, characterized in that: An inflation nozzle protective cover (3) is installed on the side of the oil tank end cover (2) facing away from the piston retaining ring (17), and the inflation nozzle protective cover (3) is arranged outside the inflation nozzle (4). The inflation nozzle protective cover (3) is used to protect the inflation nozzle (4) and perform secondary sealing on the gas leaking slightly from the inflation nozzle (4).

8. The low-noise gas spring composite piston self-pressurizing oil tank according to claim 1, characterized in that: An end cover O-ring (11) is installed on the outer circumferential surface of the oil tank end cover (2); the oil tank end cover (2) is inserted into the oil tank housing (1); the end cover O-ring (11) contacts the inner wall of the oil tank housing (1); and the end cover O-ring (11) is used for sealing between the oil tank end cover (2) and the oil tank housing (1).

9. The low-noise gas spring composite piston self-pressurizing oil tank according to claim 1, characterized in that: A supporting ring (13) is installed on the outer wall surface of the oil tank piston (12). The supporting ring (13) is made of non-metallic material. The supporting ring (13) is in direct contact with the inner wall of the oil tank housing (1). The supporting ring (13) is used to prevent the oil tank piston (12) from directly contacting the oil tank housing (1).

10. The low-noise gas spring composite piston self-pressurizing oil tank according to claim 1, characterized in that: An oil tank O-ring (16) is installed on the outer wall surface of the oil tank housing (1), and the oil tank O-ring (16) is used for sealing between the oil tank housing (1) and the hydraulic valve block.

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