Dynamic sealing structure of high-pressure piston

Abstract

The invention relates to a high-pressure piston dynamic sealing structure, which belongs to the technical field of aviation equipment vibration isolation installation, and comprises a piston rod, a piston sealing ring, a hydraulic cavity and a radial supporting part, the piston rod upwards extends to the outer side of the hydraulic cavity; the piston sealing ring is arranged on the piston rod and divides the hydraulic cavity into a liquid storage end and an air end, and the liquid storage end is connected with a hydraulic system through a communicating pipe; a first limiting hole is formed in the lower end of the hydraulic cavity, and the piston rod extends downwards to the outer side of the hydraulic cavity through the first limiting hole; the radial supporting part is arranged on the hydraulic cavity and / or the piston rod, and when the piston rod moves, the radial supporting part is matched with the first limiting hole to provide radial supporting for the piston rod. And the situation of hydraulic oil leakage caused by deviation of a piston rod of the hydraulic device due to radial force of an engine and a gap between a piston sealing ring and a cylinder wall can be prevented.

Description

Technical Field

[0001] This application relates to the technical field of vibration isolation installation of aviation equipment, and specifically relates to a high-pressure piston dynamic seal structure. Background Art

[0002] The aircraft turboprop engine is installed on the engine mount through a vibration isolation device. When the aircraft is in operation, the engine will generate torque. When the torque is too large, it may damage the vibration isolation device. In this case, it is necessary to provide a counter-torque to offset the torque generated by the engine.

[0003] The traditional anti-torsion method is to rigidly connect the engine to the engine mount using a metal torsion bar. However, this method will reduce the vibration isolation effect of the vibration isolation device. In order to reduce the impact on the vibration isolation device while anti-torsion, the existing engine anti-torsion methods also include installing a hydraulic anti-torsion device on the engine mount. The axial direction of the hydraulic device is the rotation direction of the turboprop engine blades. The hydraulic device provides one-way anti-torsion in its axial direction, reducing the impact on the vibration isolation device while anti-torsion. However, the existing hydraulic device can only resist the torque in its hydraulic axial direction. When the engine generates a radial force, it is easy to damage the piston seal of the hydraulic device, resulting in hydraulic oil leakage. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, this application provides a high-pressure piston dynamic seal structure to prevent the hydraulic oil leakage caused by the offset of the hydraulic device piston rod and the gap between the piston seal structure and the hydraulic chamber wall due to the radial force of the engine.

[0005] To achieve the above object, this application provides a high-pressure piston dynamic seal structure, including: A piston rod, a piston seal ring, a hydraulic chamber, and a radial support part; The piston rod extends upward to the outside of the hydraulic chamber; The piston seal ring is arranged on the piston rod. The piston seal ring divides the hydraulic chamber into a liquid storage end and an air end. The liquid storage end is connected to the hydraulic system through a connecting pipe; A first limiting hole is provided at the lower end of the hydraulic chamber. The piston rod extends downward to the outside of the hydraulic chamber through the first limiting hole; The radial support part is arranged on the hydraulic chamber and / or the piston rod. When the piston rod moves, the radial support part cooperates with the first limiting hole to provide radial support for the piston rod.

[0006] Optionally, the radial support part is: Cavities are provided at both the upper and lower ends of the hydraulic chamber. A ring-shaped support structure is fixedly arranged on the piston rod. The ring-shaped support structure can move in the cavity; Baffles are provided at both the upper and lower ends of the hydraulic chamber. An annular support structure is fixedly arranged on the piston rod, and the baffle provides radial support for the annular support structure; or A support ring is fixedly arranged at the upper end of the hydraulic chamber, and the support ring provides radial support for the piston rod.

[0007] Optionally, the radial support part is that support rings are fixedly arranged at both the upper and lower ends of the hydraulic chamber, and the support rings provide radial support for the piston rod.

[0008] Optionally, the hydraulic chamber is an annular cavity, and the upper end of the hydraulic chamber has a second limit hole. The first limit hole and the second limit hole allow the piston rod to move longitudinally.

[0009] Optionally, a support ring is provided at the first limit hole, and a support ring is provided at the second limit hole.

[0010] Optionally, support grooves are provided at both the first limit hole and the second limit hole, and the support rings are fixedly installed in the support grooves.

[0011] Optionally, the support ring is made of metal, ceramic or wear-resistant polymer material.

[0012] Optionally, the piston seal ring has an annular cavity, and a sealing ring is arranged in the annular cavity; a sealing cavity is provided at the connection between the liquid storage end and the piston rod, and a sealing ring is arranged in the sealing cavity.

[0013] Optionally, the lower end of the piston rod has a connection hole, and the connection hole is connected to the engine through a pull rod bearing.

[0014] Optionally, the connection hole is connected to the main shock absorber bracket on the front side of the engine through a pull rod bearing to connect the engine.

[0015] A high-pressure piston dynamic sealing structure provided by the present application includes: a piston rod, a piston seal ring, a hydraulic chamber and a radial support part; the piston rod extends upward to the outside of the hydraulic chamber; the piston seal ring is arranged on the piston rod, and the piston seal ring divides the hydraulic chamber into a liquid storage end and an air end, and the liquid storage end is connected to a hydraulic system through a connecting pipe; a first limit hole is provided at the lower end of the hydraulic chamber, and the piston rod extends downward to the outside of the hydraulic chamber through the first limit hole; the radial support part is arranged on the hydraulic chamber and / or the piston rod, and when the piston rod moves, the radial support part cooperates with the first limit hole to provide radial support for the piston rod.

[0016] Compared with the existing hydraulic anti-torsion device of a turboprop engine, the high-pressure piston dynamic sealing structure provided by the embodiments of the present application has a first limiting hole for axially limiting and axially supporting the piston rod, and also has a radial supporting part cooperating with the first limiting hole to provide radial support for the piston rod. The radial supporting part can specifically be a supporting structure on the piston rod or a supporting ring provided on the hydraulic chamber. It can prevent the piston rod of the hydraulic device from shifting due to the radial force of the engine, and the piston sealing ring and the cylinder wall from having gaps, resulting in hydraulic oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is a schematic diagram of a hydraulic anti-torsion device according to an embodiment of the high-pressure piston dynamic sealing structure of the present application; Figure 2 FIG. is a schematic structural diagram of a hydraulic anti-torsion device according to an embodiment of the high-pressure piston dynamic sealing structure of the present application.

[0018] REFERENCE SIGNS: High-pressure piston dynamic sealing structure 100, piston rod 110, connection hole 111, piston sealing ring 120, hydraulic chamber 130, oil storage end 131, radial supporting part 140, upper supporting ring 141, lower supporting ring 142, first limiting hole 150, second limiting hole 160; Accumulator 200, accumulator chamber 210, spring 220, indicating rod 230, accumulator piston 240, accumulator through hole 250, throttle hole 260; Communication pipe 300, shock absorber 400, engine 500. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0020] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0021] The traditional anti-torsion method for aircraft turboprop engines is to rigidly connect the engine to the engine mount using a metal torsion bar. However, this method reduces the vibration isolation effect of the vibration isolation device. To reduce the impact on the vibration isolation device while providing anti-torsion, existing engine anti-torsion methods also include using a hydraulic anti-torsion device installed on the engine mount. The axial direction of the hydraulic device is the rotation direction of the turboprop engine blades. The hydraulic device provides uni-directional anti-torsion in its axial direction, reducing the impact on the vibration isolation device while providing anti-torsion. However, existing hydraulic devices can only resist the hydraulic axial force, and the axial direction is the engine's torsion direction. When the engine experiences translational motion, that is, when the engine generates a radial force relative to the hydraulic device, it is easy to cause the radial offset of the hydraulic device's piston rod, further causing a gap between the piston seal ring and the wall of the hydraulic piston cylinder, resulting in hydraulic oil leakage.

[0022] In view of the above phenomenon, in the first embodiment of a high-pressure piston dynamic seal structure in the present application, a high-pressure piston dynamic seal structure is provided, including: a piston rod 110, a piston seal ring 120, a hydraulic chamber 130, and a radial support portion 140; the piston rod 110 extends upward to the outside of the hydraulic chamber 130; the piston seal ring 120 is disposed on the piston rod 110, and the piston seal ring 120 divides the hydraulic chamber 130 into a liquid storage end and an air end. The liquid storage end is connected to a hydraulic system through a communication pipe 300; a first limiting hole 150 is provided at the lower end of the hydraulic chamber 130, and the piston rod 110 extends downward through the first limiting hole 150 to the outside of the hydraulic chamber 130; the radial support portion 140 is disposed on the hydraulic chamber 130 and / or the piston rod 110, and when the piston rod 110 moves, the radial support portion 140 cooperates with the first limiting hole 150 to provide radial support for the piston rod 110.

[0023] It should be noted that referring to Figure 1 and Figure 2 , the high-pressure piston dynamic seal structure 100 and the accumulator 200 are the main components of the hydraulic anti-torsion device. The high-pressure piston dynamic seal structure 100 and the accumulator 200 are connected through a communication pipe 300. The hydraulic anti-torsion device has two high-pressure piston dynamic seal structures 100 on the left and right, respectively connected to both sides of the engine 500's torsion. Referring to Figure 1 , when the engine generates an input torque T in , the piston seal ring 120 and the piston rod 110 of the left high-pressure piston dynamic seal structure 100 move upward by X C , and at the same time, the piston seal ring 120 and the piston rod 110 of the right high-pressure piston dynamic seal structure 100 move downward by X C。The spring 220 in the accumulator 200 presses against the hydraulic oil to compensate for the system pressure. The lower end of the piston rod 110 of the high-pressure piston dynamic seal structure 100 is connected to the engine 500. When the engine 500 generates a radial force, the radial support portion 140 of the high-pressure piston dynamic seal structure of the present application cooperates with the first limit hole 150 to radially limit and support the piston rod 110, preventing the piston rod 110 from driving the piston seal ring 120 to twist or shift, thereby causing damage to the hydraulic piston seal. The first limit hole 150 axially limits and axially supports the piston rod 110. The radial support portion 140 may be: when the piston rod 110 extends upward, a support structure is provided above the hydraulic chamber 130, and the support structure cooperates with the first limit hole 150 to provide radial constraint and support for the upward-extending piston rod 110; or when the piston rod 110 extends upward, support structures are provided above and below the actuating cylinder to radially constrain the actuating rod. The support structure may specifically be a support ring or a support rod, etc., and is provided on the piston rod 110 or the body of the hydraulic chamber 130.

[0024] In this embodiment, the high-pressure piston dynamic seal structure has the first limit hole 150 to axially limit and axially support the piston rod 110, and also has the radial support portion 140 that cooperates with the first limit hole 150 to provide radial support for the piston rod 110. The radial support portion 140 may specifically be a support structure on the piston rod 110 or a support ring provided on the hydraulic chamber 130. It can prevent the piston rod 110 of the hydraulic device from shifting due to the radial force of the engine 500, and prevent the piston seal ring 120 from having a gap with the inner wall of the hydraulic chamber 130, thereby causing hydraulic oil leakage.

[0025] Further, the radial support portion 140 is: cavities are provided at both the upper and lower ends of the hydraulic chamber 130, and an annular support structure is fixedly provided on the piston rod 110, and the annular support structure can move within the cavities; baffles are provided at both the upper and lower ends of the hydraulic chamber 130, and an annular support structure is fixedly provided on the piston rod 110, and the baffles provide radial support for the annular support structure; or a support ring is fixedly provided at the upper end of the hydraulic chamber 130, and the support ring provides radial support for the piston rod 110.

[0026] It should be noted that when the piston rod 110 moves up and down, the first limiting hole 150 axially limits the piston rod 110. At this time, the piston rod 110 is equivalent to having only one support point at the first limiting hole 150. Once the engine 500 generates a radial force, it is easy to cause the piston rod 110 to twist or deviate from the central axis, resulting in the piston seal ring 120 deviating by a corresponding angle and no longer being perpendicular to the inner wall of the hydraulic cavity 130, forming a gap and causing hydraulic oil leakage. The radial support portion 140 is an additional support point added to the upward extension end of the hydraulic rod. This newly added support point cooperates with the support point at the first limiting hole 150 to provide radial support for the piston rod 110. In other feasible embodiments, in addition to supporting the upward extension end of the hydraulic rod, the radial support portion 140 can also add a support point below the first limiting hole 150 to further provide radial support for the piston rod 110.

[0027] Specifically, the annular support structure is fixedly arranged at the upward extension end and the lower end of the piston rod 110. The upward extension end and the lower end remain outside the range of the hydraulic cavity 130 during the movement of the piston rod 110. The outer side of the annular support structure contacts the inner wall of the cavity or the baffle, and the cavity or the baffle limits the annular support structure. When the piston rod 110 moves up and down, the first limiting hole 150 axially limits the piston rod 110, and the cavities or baffles at the upper and lower ends of the hydraulic cavity 130 cooperate with the annular support structure to provide radial support for the piston rod 110.

[0028] When a support ring is fixedly arranged at the upper end of the hydraulic cavity 130, the support ring limits the upward extension end of the piston rod 110 during the movement of the piston rod 110, and the support ring cooperates with the first limiting hole 150 to provide radial support for the piston rod 110.

[0029] Furthermore, support rings are fixedly arranged at both the upper and lower ends of the hydraulic cavity 130, and the support rings provide radial support for the piston rod 110.

[0030] It should be noted that an upper support ring 141 is provided at the upper end of the hydraulic cavity 130 to limit and support the upward extension end of the piston rod 110, and a lower support ring 142 is also arranged below the first limiting hole 150 of the hydraulic cavity 130 to further limit and support the piston rod 110.

[0031] In this embodiment, the upper support ring 141, the first limiting hole 150 and the lower support ring 142 cooperate to provide radial support for the piston rod 110.

[0032] Furthermore, the hydraulic cavity 130 is an annular cavity, and the upper end of the hydraulic cavity 130 has a second limiting hole 160. The first limiting hole 150 and the second limiting hole 160 allow the piston rod 110 to move longitudinally.

[0033] It should be noted that the piston rod 110 has a hollow rod structure. The upward extending end of the piston rod 110 passes through the second limiting hole 160 to the outside of the hydraulic cavity 130, and the first limiting hole 150 and the second limiting hole 160 radially constrain the piston rod 110.

[0034] Furthermore, the support ring is provided at the first limiting hole 150, and the support ring is provided at the second limiting hole 160.

[0035] It should be noted that in this embodiment, the support ring is fixedly arranged inside the limiting hole. In other feasible embodiments, the support ring can be arranged on the outside of the limiting hole away from the hydraulic cavity 130.

[0036] In this embodiment, by radially limiting the upper and lower ends of the piston rod 110, support rings are further arranged at the first limiting hole 150 and the second limiting hole 160 to provide radial support for the upper and lower ends of the piston rod 110.

[0037] Furthermore, support grooves are provided at both the first limiting hole 150 and the second limiting hole 160, and the support rings are fixedly installed in the support grooves.

[0038] It should be noted that the first limiting hole 150 is provided with an annular support groove for fixing the upper support ring 141, and the second limiting hole 160 is provided with an annular support for fixing the lower support ring 142.

[0039] Furthermore, the support ring is made of metal, ceramic or wear-resistant polymer material.

[0040] Furthermore, the piston seal ring 120 has an annular cavity, and a sealing ring is arranged in the annular cavity; a sealing cavity is provided at the connection of the liquid storage end and the piston rod 110, and a sealing ring is arranged in the sealing cavity.

[0041] It should be noted that the hydraulic torsion-resistant device has a left actuator and a right actuator. The liquid storage ends of the left actuator and the right actuator are opposite up and down. When the liquid storage end is at the upper end of the hydraulic cavity 130, a sealing cavity is provided at the connection of the upper part of the hydraulic cavity 130 and the piston rod 110; when the liquid storage end is at the lower end of the hydraulic cavity 130, a sealing cavity is provided at the connection of the lower part of the hydraulic cavity 130 and the piston rod 110.

[0042] When support rings are provided at the first limiting hole 150 and the second limiting hole 160, the sealing cavity is arranged at a position close to the liquid storage end of the first limiting hole 150 or the second limiting hole 160 according to the position of the liquid storage end.

[0043] Furthermore, the lower end of the piston rod 110 has a connection hole 111, and the connection hole 111 is connected to the engine 500 through a pull rod bearing, and the piston rod 110 transmits the force and torque of the engine 500.

[0044] Furthermore, the connection hole 111 is connected to the main bracket of the shock absorber 400 at the front side of the engine 500 through a tie rod bearing to connect the engine 500 .

[0045] It should be noted that the main bracket of the front shock absorber 400 is directly mounted on the engine 500 by bolts, and the piston rod 110 is connected to the engine 500 by connecting the main bracket of the front shock absorber 400.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0047] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A high-pressure piston dynamic seal structure, characterized in that: include: Piston rod, piston sealing ring, hydraulic chamber and radial support part; The piston rod extends upward to the outside of the hydraulic chamber; The piston sealing ring is arranged on the piston rod, and the piston sealing ring divides the hydraulic chamber into a liquid storage end and an air end, and the liquid storage end is connected to the hydraulic system through a connecting pipe; A first limiting hole is provided at the lower end of the hydraulic chamber, and the piston rod extends downward to the outside of the hydraulic chamber through the first limiting hole; The radial support portion is arranged on the hydraulic chamber and / or the piston rod. When the piston rod moves, the radial support portion cooperates with the first limiting hole to provide radial support to the piston rod.

2. The high-pressure piston dynamic seal structure according to claim 1, characterized in that: The radial support portion is: The hydraulic chamber is provided with cavities at both the upper and lower ends, and an annular support structure is fixedly provided on the piston rod, and the annular support structure can move in the cavity; Baffles are provided at both the upper and lower ends of the hydraulic chamber, an annular support structure is fixedly provided on the piston rod, and the baffles provide radial support for the annular support structure; or A support ring is fixedly arranged at the upper end of the hydraulic chamber, and the support ring provides radial support for the piston rod.

3. The high-pressure piston dynamic seal structure according to claim 1, characterized in that: The radial support portion is: The support rings are fixedly arranged at both the upper and lower ends of the hydraulic chamber, and the support rings provide radial support for the piston rod.

4. The high-pressure piston dynamic seal structure according to claim 3, characterized in that: The hydraulic cavity is an annular cavity, and the upper end of the hydraulic cavity is provided with a second limiting hole, and the first limiting hole and the second limiting hole can allow the piston rod to move longitudinally.

5. The high-pressure piston dynamic seal structure according to claim 4, characterized in that: The support ring is disposed at the first limiting hole, and the support ring is disposed at the second limiting hole.

6. The high-pressure piston dynamic seal structure according to claim 5, characterized in that: The first limiting hole and the second limiting hole are both provided with supporting grooves, and the supporting grooves are used to fix the supporting ring.

7. The high pressure piston dynamic seal structure according to any one of claims 2 to 6, characterized in that: The support ring is made of metal, ceramic or wear-resistant polymer material.

8. The high-pressure piston dynamic seal structure according to claim 1, characterized in that: The piston sealing ring is provided with an annular cavity, and a sealing ring is arranged in the annular cavity; the liquid storage end is provided with a sealing cavity at the connection with the piston rod, and a sealing ring is arranged in the sealing cavity.

9. The high-pressure piston dynamic seal structure according to claim 8, characterized in that: The lower end of the piston rod is provided with a connecting hole, and the connecting hole is connected to the engine through a tie rod bearing.

10. The high-pressure piston dynamic seal structure according to claim 9, characterized in that: The connecting hole is connected to the main support of the shock absorber at the front side of the engine through a tie rod bearing to connect the engine.

Images