Bidirectional oil-gas mixing buffer

Abstract

The utility model discloses a two-way oil-gas mixing buffer which comprises an earring bolt, a piston rod, a cylinder body and a floating piston, the floating piston is arranged in the cylinder body, and a supporting ring is arranged in the cylinder body. The rear end of the piston rod penetrates through the supporting ring and is movably connected with the floating piston; a first oil-gas mixing cavity is formed between the piston rod in the cylinder and the supporting ring, a second oil-gas mixing cavity is formed between the piston rod and the floating piston, and an air cavity is formed between the floating piston and the cylinder; the first oil-gas mixing cavity is communicated with the second oil-gas mixing cavity through a piston rod, and a gas injection mechanism communicated with the first oil-gas mixing cavity and a ventilation mechanism communicated with the air cavity are arranged on the barrel. According to the buffer, bidirectional buffering is achieved through matching of the piston rod and the floating piston, the damping performance is stable, and the buffer is simple in overall structure, has wide guiding significance on the structural design of the buffer and is suitable for application and popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation landing gear, in particular to a bidirectional oil-gas mixing buffer. Background Art

[0002] The landing gear is the attachment on the underside of an aircraft used to support the aircraft during takeoff, landing, or ground taxiing, allowing it to maneuver on the ground. As the sole support component of an aircraft, the landing gear is an essential component. Without it, an aircraft cannot maneuver on the ground. After takeoff, the landing gear can be retracted depending on the aircraft's performance. To accommodate takeoff, landing roll, and ground taxiing, the lower end of the landing gear is equipped with wheels with pneumatic tires. To shorten the landing roll, the wheels are equipped with brakes or automatic brakes. Other components include load-bearing struts, shock absorbers, a retraction and extension mechanism, a nose wheel shimmy damper, and a steering mechanism.

[0003] When an aircraft touches down or taxis at high speed on an uneven runway, it violently impacts the ground. While the pneumatic tires provide a small cushioning effect, the majority of the impact energy is absorbed by the shock absorbers. The most widely used shock absorbers on modern aircraft are oil-air shock absorbers. When the shock absorber is compressed by an impact, the air acts like a spring, storing energy. The oil, however, flows through the small holes at extremely high speed, absorbing much of the impact energy and converting it into heat. This allows the aircraft to quickly stabilize after the impact, preventing turbulence.

[0004] Currently, most aircraft landing gear utilizes hydro-pneumatic shock absorbers, whose internal design is constantly undergoing improvement and development. To enhance the shock absorber's capacity and reduce dynamic loads during landing, especially during taxiing and maneuvering, single-stage, dual-chamber shock absorbers (i.e., a single shock absorber containing two air chambers, low-pressure and high-pressure), are commonly used. A spring-controlled throttle valve is added to the shock absorber's piston to open at a given load, thereby improving the shock absorber's performance.

[0005] A search revealed patent publication number CN206889552U, which discloses a novel oil-gas hybrid buffer, and patent application publication number CN102003490A, which discloses a hydraulic buffer. These two patents, each offering a buffer that meets practical requirements from different perspectives, aim to avoid the damping effect of spring-structured one-way buffers, resulting in a buffer that differs from existing technologies and meets practical requirements. Utility Model Content

[0006] The technical problem to be solved by the present invention is to address the problems existing in the background technology, thereby providing a buffer with a simple structure, easy operation and use. The buffer can effectively solve the problem of attenuation of one-way buffering due to damping effect, so as to meet the use requirements. Specifically, it is a two-way oil-gas mixed buffer.

[0007] To solve the above technical problems, the present invention adopts the following technical solution: a bidirectional oil-gas mixing buffer, comprising an earring bolt, a piston rod, a cylinder body, and a floating piston, wherein the cylinder body is configured as a cylindrical structure with one end open, and the floating piston is configured as a cylindrical structure having a first accommodating chamber and a second accommodating chamber, the floating piston being disposed within the cylinder body, and a support ring being provided at the open end of the cylinder body; the earring bolt is connected to the front end of the piston rod, and the rear end of the piston rod is movably connected to the floating piston through the support ring; a first oil-gas mixing chamber is formed between the piston rod and the support ring within the cylinder body, a second oil-gas mixing chamber is formed between the piston rod and the first accommodating chamber in the floating piston, and an air chamber is formed between the second accommodating chamber in the floating piston and the cylinder body; the first oil-gas mixing chamber and the second oil-gas mixing chamber are communicated with each other through the piston rod, and the cylinder body is provided with an air injection mechanism communicating with the first oil-gas mixing chamber and a ventilation mechanism communicating with the air chamber; and connecting holes are provided at the front end of the earring bolt and the rear end of the cylinder body, respectively.

[0008] Furthermore, a bidirectional oil-gas mixing buffer described in the present invention is adopted, wherein the gas injection mechanism includes a gas injection hole and a gas injection joint installed in the gas injection hole, and the gas injection hole is arranged in the cylinder near one side of the support ring.

[0009] Furthermore, a bidirectional oil-gas mixing buffer described in the utility model is adopted, and the ventilation mechanism includes a first ventilation hole and a second ventilation hole. The first ventilation hole is arranged in the cylinder on the side away from the support ring, and the second ventilation hole is arranged in the floating piston corresponding to the first ventilation hole and communicates with the second accommodating cavity in the floating piston.

[0010] Furthermore, in the bidirectional oil-gas mixing buffer of the present invention, a plurality of second air vents are provided, and the plurality of second air vents are evenly arranged in a ring shape in the floating piston.

[0011] Furthermore, using the bidirectional oil-gas mixing buffer described in the present invention, the ventilation mechanism also includes a filter screen, and the filter screen is installed in the first ventilation hole.

[0012] Furthermore, a bidirectional oil-gas mixing buffer described in the utility model is adopted, and the piston rod includes a guide part and a connecting part. The piston rod forms an integrated cylindrical structure through the guide part and the connecting part, and an axial blind hole is provided in the guide part. The piston rod is connected to the earring bolt through the axial blind hole in the guide part, and is slidingly connected to the support ring through the guide part. The piston rod is slidingly connected to the floating piston through the connecting part, and a throttling hole is provided in the connecting part. The first oil-gas mixing chamber and the second oil-gas mixing chamber are communicated through the throttling hole.

[0013] Furthermore, the bidirectional oil-gas mixing buffer described in the utility model also includes a support ring, and a limiting groove matching the support ring is provided on the inner wall surface of the support ring. The support ring is arranged in the limiting groove, and the guide part in the piston rod is slidably connected to the inner wall surface of the support ring through the support ring.

[0014] Furthermore, the bidirectional oil-gas mixing buffer described in the utility model also includes a braking nut, which blocks the opening of the first accommodating cavity in the floating piston, and the floating piston is slidingly connected to the inner wall of the cylinder through the braking nut; and the connecting part in the piston rod passes through the braking nut and is connected to the inner wall of the first accommodating cavity in the floating piston.

[0015] Furthermore, the bidirectional oil-gas mixing buffer described in the present invention also includes a clamping nut, and the support ring is fixed to the inner wall surface of the open end of the cylinder through the clamping nut.

[0016] Furthermore, the bidirectional oil-gas mixing buffer described in the present invention also includes a sealing assembly, and sealing grooves corresponding to the sealing assembly are respectively provided on the inner wall and outer wall of the support ring, and the outer wall of the floating piston close to the second accommodating cavity. The sealing assembly is arranged in the sealing groove, and the outer wall of the support ring is tightly sealed to the inner wall of the open end of the cylinder through the sealing assembly. The piston rod is slidingly sealed to the inner wall of the support ring through the sealing assembly, and the floating piston is slidingly sealed to the inner wall of the cylinder through the sealing assembly.

[0017] The bidirectional oil-gas mixing buffer described in the present invention is used. By setting a floating piston in the cylinder, the inner cavity of the cylinder is divided into three variable cavities by utilizing the cooperation between the piston rod and the floating piston. The two oil-gas mixing cavities are connected through the throttle hole in the piston rod, while the air cavity is connected to the outside world. Therefore, when the buffer is subjected to tensile or compressive loads, it plays a buffering and energy-absorbing role. When there is no external load, it is always in a neutral position. By utilizing the cooperation between the two communicating oil-gas mixing cavities and the floating piston, the volume of the three cavities can be changed, thereby achieving bidirectional movement. It can be seen that the buffer described in the present invention realizes bidirectional buffering by utilizing the cooperation between the piston rod and the floating piston, which not only stabilizes the damping performance, but also makes the buffer work more stably. Its overall structure is simple, the design is reasonable, and it is easy to operate and use. There is no need to set up components such as springs, which greatly reduces the manufacturing cost. It has broad guiding significance for the design of buffer structures and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be described in further detail below with reference to the accompanying drawings.

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 for Figure 1 A magnified schematic diagram of the structure at position Ⅰ in the middle;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure enlarged at position II in the middle;

[0022] Figure 4 This is a schematic structural diagram of the buffer of the present invention in a neutral state;

[0023] Figure 5 This is a schematic structural diagram of the buffer of the present invention when it is in a stretched stroke state;

[0024] Figure 6 This is a structural schematic diagram of the buffer of the present invention when it is in a compression stroke state.

[0025] Shown in the figure: 1-earring bolt, 2-piston rod, 21-guide part, 22-connecting part, 23-throttle hole, 3-cylinder, 4-floating piston, 5-support ring, 51-limiting groove, 6-air injection mechanism, 61-air injection hole, 62-air injection joint, 7-ventilation mechanism, 71-first air vent, 72-second air vent, 73-filter, 8-support ring, 9-brake nut, 10-pressure nut, 11-sealing assembly, 12-sealing groove, A-first oil-gas mixing chamber, B-second oil-gas mixing chamber, C-air chamber. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0027] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification for the understanding and reading of those familiar with this technology. They are not used to limit the conditions for the implementation of this utility model and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose of the utility model. At the same time, the terms such as "upper", "lower", "left", "right", etc. quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of this utility model without substantially changing the technical content.

[0028] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "provided with" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus. Example 1

[0030] like Figures 1 to 3As shown, this embodiment provides a two-way oil-gas mixing buffer, including an earring bolt 1, a piston rod 2, a cylinder 3 and a floating piston 4. The cylinder 3 is configured as a cylindrical structure with one end open, and the floating piston 4 is configured as a cylindrical structure with a first accommodating cavity and a second accommodating cavity. The floating piston 4 is arranged in the cylinder 3, and a support ring 5 is provided at the open end of the cylinder 3; the earring bolt 1 is connected to the front end of the piston rod 2, and the rear end of the piston rod 2 passes through the support ring 5 and is movably connected to the floating piston 4; the piston rod 2 in the cylinder 3 is connected to the support ring 5. A first oil-gas mixing chamber A is formed between the rings 5, a second oil-gas mixing chamber B is formed between the piston rod 2 and the first accommodating chamber in the floating piston 4, and an air chamber C is formed between the second accommodating chamber in the floating piston 4 and the cylinder 3; the first oil-gas mixing chamber A and the second oil-gas mixing chamber B are communicated with each other through the piston rod 2, and an air injection mechanism 6 communicated with the first oil-gas mixing chamber A and a ventilation mechanism 7 communicated with the air chamber C are provided on the cylinder 3; connecting holes are respectively provided at the front end of the earring bolt 1 and the rear end of the cylinder 3.

[0031] Furthermore, a bidirectional oil-gas mixed buffer described in this embodiment is adopted, and the air injection mechanism 6 includes an air injection hole 61 and an air injection joint 62 installed in the air injection hole 61, and the air injection hole 61 is arranged in the cylinder 3 on the side close to the support ring 5; and the ventilation mechanism 7 includes a first air vent 71 and a second air vent 72, the first air vent 71 is arranged in the cylinder 3 on the side away from the support ring 5, and the second air vent 72 is arranged in the floating piston 4 corresponding to the first air vent 71, and is communicated with the second accommodating cavity in the floating piston 4.

[0032] Furthermore, a bidirectional oil-gas mixing buffer is adopted as described in this embodiment, and the ventilation mechanism 7 also includes a filter screen 73, and the filter screen 73 is installed in the first ventilation hole 71, and the second ventilation hole 72 is provided with multiple, and the multiple second ventilation holes 72 are evenly arranged in a ring shape in the floating piston 4.

[0033] Furthermore, a bidirectional oil-gas mixing buffer described in this embodiment is adopted, and the piston rod 2 includes a guide portion 21 and a connecting portion 22. The piston rod 2 forms an integrated cylindrical structure through the guide portion 21 and the connecting portion 22, and an axial blind hole is provided in the guide portion 21. The piston rod 2 is connected to the earring bolt 1 through the axial blind hole in the guide portion 21, and is slidingly connected to the support ring 5 through the guide portion 21. The piston rod 2 is slidingly connected to the floating piston 4 through the connecting portion 22, and a throttle hole 23 is provided in the connecting portion 22. The first oil-gas mixing chamber A and the second oil-gas mixing chamber B are communicated through the throttle hole 23.

[0034] Furthermore, a bidirectional oil-gas mixing buffer described in this embodiment also includes a support ring 8, a brake nut 9 and a clamping nut 10, and a limiting groove 51 matching the support ring 8 is provided on the inner wall surface of the support ring 5, the support ring 8 is arranged in the limiting groove 51, and the guide portion 21 in the piston rod 2 is slidingly connected to the inner wall surface of the support ring 5 through the support ring 8; the brake nut 9 blocks the opening of the first accommodating cavity in the floating piston 4, and the floating piston 4 is slidingly connected to the inner wall surface of the cylinder 3 through the brake nut 9; and the connecting portion 22 in the piston rod 2 passes through the brake nut 9 and is connected to the inner wall surface of the first accommodating cavity in the floating piston 4; the support ring 5 is fixed to the inner wall surface of the open end of the cylinder 3 through the clamping nut 10. Example 2

[0035] This embodiment is based on the embodiment 1. In order to facilitate the sliding of the floating piston 4 in the cylinder 3 on the inner wall surface of the cylinder 3 and to achieve sealing, a closed structure is formed between the support ring 5 and the cylinder 3, as well as between the piston rod 2 and the support ring 5, thereby enhancing the sealing performance.

[0036] The bidirectional oil-gas mixing buffer described in this embodiment further includes a sealing assembly 11. Seal grooves 12 corresponding to the sealing assembly 11 are provided on the inner and outer walls of the support ring 5, as well as on the outer wall of the floating piston 4 near the second accommodating chamber. The sealing assembly 11 is disposed within the sealing groove 12. The outer wall of the support ring 5 is tightly sealed to the inner wall of the open end of the cylinder 3 via the sealing assembly 11. The piston rod 2 is slidingly sealed to the inner wall of the support ring 5 via the sealing assembly 11, and the floating piston 4 is slidingly sealed to the inner wall of the cylinder 3 via the sealing assembly 11. The sealing assembly 11 can be a plastic seal commonly used in the prior art.

[0037] The bidirectional oil-gas mixing buffer described in this embodiment works as follows: Figure 4 As shown, for ease of explanation, the first oil-gas mixing chamber A is referred to as chamber A, the second oil-gas mixing chamber B is referred to as chamber B, and the air chamber C is referred to as chamber C. At this point, the buffer is in a neutral position. The gas injection mechanism 6 provided on the cylinder 3 pre-fills chambers A and B with hydraulic oil and high-purity industrial nitrogen through the gas injection connector 62, thereby forming an oil-gas mixing chamber. The filling pressure is determined by the buffer force value. In this utility model, the external load is designed to be 1 MPa.

[0038] During the stretching buffer stroke stage: Figure 4As shown, since the outer tube 3 is installed in the landing gear and is in a fixed state, a leftward external load is applied to the earring bolt 1, pulling the piston rod 2 to the left. The piston rod 2 contacts the brake nut 9, thereby driving the floating piston 4 to the left as a whole. This compresses the oil-gas mixture in chamber A, and the oil-gas mixture in chamber A flows to chamber B through the throttle hole 23 in the piston rod 2. The gas in chambers A and B is compressed, the pressure increases, and energy is stored. At this time, the volume of chamber A decreases, while the volume of chamber B remains unchanged, thereby increasing the volume of chamber C. Chamber C is connected to the outside atmosphere through the vent mechanism 7. When the brake nut 9 contacts the support ring 5, the maximum buffer stroke, i.e., the maximum stretch stroke LA, is reached. At this time, the maximum buffer force is reached, thus completing the pull-out buffer stroke. The structure at the maximum stretch stroke state is as shown below. Figure 5 shown.

[0039] During the reset process, when the earring bolt 1 releases the external load, the oil-gas mixture in the A chamber and the B chamber expands, pushing the floating piston 4 to move to the right, and the piston rod 2 contacts the brake nut 9, which pushes the piston rod 2 to move to the right. The gas in the oil-gas mixture in the A chamber expands, and the oil-gas mixture flows from the B chamber to the A chamber through the throttle hole 23, the pressure decreases, and the energy is released. The volume of the A chamber increases, the volume of the B chamber remains unchanged, and the volume of the C chamber decreases. The air is discharged from the C chamber through the first vent hole 71 in the ventilation mechanism 7. When the right end face of the floating piston 4 contacts the rear end face of the cylinder 3, the neutral return stroke is reached, and the neutral buffer stroke is completed. The structure when reaching neutral is as shown in FIG. Figure 4 shown.

[0040] During the compression buffer stroke: Figure 4 As shown, outer cylinder 3 is in a fixed state. A rightward compressive external load is applied to earring bolt 1, pushing piston rod 2 to the right. Piston rod 2 slides along the inner cavity of floating piston 4 and enters chambers A and B. The combined volume of chambers A and B decreases, compressing the oil-gas mixture in chamber B. The oil-gas mixture flows from chamber B through throttle hole 23 to chamber A. The gas in chambers A and B is compressed, increasing the pressure and storing energy. At this time, the volume of chamber A increases, the volume of chamber B decreases, and the volume of chamber C remains unchanged. When the right end face of piston rod 2 contacts the end face of floating piston 4, the maximum compression buffer stroke, i.e., maximum compression stroke LB, is reached. At this time, the maximum buffer force is achieved, completing the compression buffer stroke. The structure at the maximum compression stroke state is as follows. Figure 6 shown.

[0041] During the reset process, when the earring bolt 1 releases the external load, the oil-gas mixture in the A and B chambers expands, and the air pressure in the B chamber pushes the floating piston 4 to move to the left, synchronously driving the piston rod 2 to move. The gas in the oil-gas mixture in the A chamber expands, and the oil-gas mixture flows from the A chamber to the B chamber through the throttle hole 23, the pressure decreases, and the energy is released. The volume of the A chamber decreases, the volume of the B chamber increases, and the volume of the C chamber remains unchanged. The piston rod 2 contacts the brake nut 9, reaches the neutral return stroke, and completes the compression neutral buffer stroke. The structure when reaching neutral is as follows Figure 4 shown.

[0042] It can be seen that the bidirectional oil-gas mixing buffer described in the present invention is adopted, by means of a floating piston 4 arranged in the cylinder 3, and by means of the cooperation between the piston rod 2 and the floating piston 4, the inner cavity of the cylinder 3 is divided into three variable cavities, the two oil-gas mixing cavities are communicated with each other through the throttle hole 23 in the piston rod 2, and the air cavity C is communicated with the outside world, so that the buffer plays a buffering and energy-absorbing role when subjected to tensile or compressive loads, and is always in a neutral position when there is no external load. By means of the cooperation between the two communicating oil-gas mixing cavities and the floating piston 4, the volumes of the three cavities can be made variable, thereby achieving bidirectional movement.

[0043] To sum up, the buffer described in the utility model realizes two-way buffering through the cooperation of the piston rod 2 and the floating piston 4, which not only stabilizes the damping performance, but also makes the buffer work more stably. Its overall structure is simple, the design is reasonable, and it is easy to operate and use. There is no need to set components such as springs, which greatly reduces the manufacturing cost. It has broad guiding significance for the design of buffer structures and is suitable for promotion and application.

[0044] Other aspects of the present invention that are not described in detail are all conventional technologies known to those skilled in the art.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various changes and variations are possible. Any modifications, equivalent replacements, improvements, etc. made using the present invention should be included in the scope of protection of the present invention.

Claims

1. A bidirectional oil-gas mixed buffer, characterized by: The invention comprises an earring bolt (1), a piston rod (2), a cylinder (3) and a floating piston (4); the cylinder (3) is configured as a cylindrical structure with one end open, and the floating piston (4) is configured as a cylindrical structure with a first accommodating cavity and a second accommodating cavity; the floating piston (4) is arranged in the cylinder (3), and a support ring (5) is provided at the open end of the cylinder (3); the earring bolt (1) is connected to the front end of the piston rod (2), and the rear end of the piston rod (2) passes through the support ring (5) and is movably connected to the floating piston (4); a first oil seal is formed between the piston rod (2) in the cylinder (3) and the support ring (5). An air-oil mixing chamber (A) is formed between the piston rod (2) and the first accommodating chamber in the floating piston (4), and an air chamber (C) is formed between the second accommodating chamber in the floating piston (4) and the cylinder (3); the first oil-air mixing chamber (A) and the second oil-air mixing chamber (B) are communicated through the piston rod (2), and an air injection mechanism (6) communicated with the first oil-air mixing chamber (A) and a ventilation mechanism (7) communicated with the air chamber (C) are provided on the cylinder (3); and connecting holes are respectively provided at the front end of the earring bolt (1) and the rear end of the cylinder (3).

2. A bidirectional oil-gas mixed buffer according to claim 1, characterized in that: The gas injection mechanism (6) comprises a gas injection hole (61) and a gas injection joint (62) installed in the gas injection hole (61). The gas injection hole (61) is arranged in the cylinder (3) on one side close to the support ring (5).

3. The bidirectional oil-gas mixed buffer according to claim 1, characterized in that: The vent mechanism (7) comprises a first vent hole (71) and a second vent hole (72), wherein the first vent hole (71) is arranged in the cylinder (3) on a side away from the support ring (5), and the second vent hole (72) is arranged in the floating piston (4) corresponding to the first vent hole (71) and communicates with a second accommodating cavity in the floating piston (4).

4. The bidirectional oil-gas mixed buffer according to claim 3, characterized in that: A plurality of the second vent holes (72) are provided, and the plurality of the second vent holes (72) are evenly arranged in a ring shape in the floating piston (4).

5. The bidirectional oil-gas mixed buffer according to claim 3, characterized in that: The ventilation mechanism (7) further comprises a filter screen (73), and the filter screen (73) is installed in the first ventilation hole (71).

6. The bidirectional oil-gas mixed buffer according to claim 1, characterized in that: The piston rod (2) includes a guide portion (21) and a connecting portion (22). The piston rod (2) forms an integrated cylindrical structure through the guide portion (21) and the connecting portion (22), and an axial blind hole is provided in the guide portion (21). The piston rod (2) is connected to the earring bolt (1) through the axial blind hole in the guide portion (21), and is slidably connected to the support ring (5) through the guide portion (21). The piston rod (2) is slidably connected to the floating piston (4) through the connecting portion (22), and a throttle hole (23) is provided in the connecting portion (22). The first oil-gas mixing chamber (A) and the second oil-gas mixing chamber (B) are communicated through the throttle hole (23).

7. The bidirectional oil-gas mixed buffer according to claim 6, characterized in that: It also includes a support ring (8), and a limiting groove (51) matching the support ring (8) is provided on the inner wall surface of the support ring (5), the support ring (8) is arranged in the limiting groove (51), and the guide portion (21) in the piston rod (2) is slidably connected to the inner wall surface of the support ring (5) through the support ring (8).

8. The bidirectional oil-gas mixed buffer according to claim 7, characterized in that: It also includes a brake nut (9), which blocks the opening of the first accommodating cavity in the floating piston (4). The floating piston (4) is slidably connected to the inner wall of the cylinder (3) through the brake nut (9); and the connecting portion (22) in the piston rod (2) passes through the brake nut (9) and is connected to the inner wall of the first accommodating cavity in the floating piston (4).

9. The bidirectional oil-gas mixed buffer according to claim 8, characterized in that: It also includes a clamping nut (10), and the support ring (5) is fixed to the inner wall surface of the open end of the cylinder (3) through the clamping nut (10).

10. The bidirectional oil-gas mixed buffer according to claim 1, characterized in that: The invention also includes a sealing component (11). The inner wall surface and the outer wall surface of the support ring (5), as well as the outer wall surface of the floating piston (4) close to the second accommodating cavity are respectively provided with sealing grooves (12) corresponding to the sealing component (11). The sealing component (11) is arranged in the sealing groove (12). The outer wall surface of the support ring (5) is tightly sealed to the inner wall surface of the open end of the cylinder (3) through the sealing component (11). The piston rod (2) is slidingly sealed to the inner wall surface of the support ring (5) through the sealing component (11), and the floating piston (4) is slidingly sealed to the inner wall surface of the cylinder (3) through the sealing component (11).

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