Tandem type buffer with double air cavities and double throttle valves

Abstract

The utility model discloses a tandem type buffer with double air cavities and double throttle valves in the technical field of buffers, which comprises an outer cylinder, an oil cavity is arranged in the outer cylinder, a low-pressure piston rod is arranged on one side of the outer cylinder, a high-pressure piston rod is arranged on the other side of the outer cylinder, a low-pressure cavity throttle valve is arranged on one side of the low-pressure piston rod close to the outer cylinder, and a high-pressure cavity throttle valve is arranged on the other side of the outer cylinder. A high-pressure cavity throttling valve is arranged on the side, close to the outer cylinder, of the high-pressure piston rod, a low-pressure cavity is formed in the low-pressure piston rod, a high-pressure cavity is formed in the high-pressure piston rod, and knuckle bearings are arranged on the sides, away from each other, of the low-pressure piston rod and the high-pressure piston rod correspondingly. The buffer solves the problems that an existing buffer is large in part variety, complex in manufacturing difficulty, long in maintenance time, low in efficiency, high in cost and the like, the number of parts of the existing buffer is large, and the existing buffer is difficult to manufacture and maintain. And the requirements of the helicopter on the take-off and landing performance of the undercarriage and the anti-crash performance of the undercarriage cannot be met at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of buffers, in particular to a double-cavity double-throttle valve serial buffer. Background Art

[0002] In order to improve the survival rate of the helicopter crew when landing in an accident and provide safe and effective protection for the crew, the helicopter landing gear must not only meet the conventional functional requirements, but also absorb the crash energy when the helicopter lands at a higher speed and bear a larger landing load. The buffer is an important part of the landing gear, and its main function is to absorb the landing energy and cushion the landing impact, improve the energy absorption efficiency of the buffer, and reduce the impact load during landing.

[0003] However, the existing buffer parts are of many types, the manufacturing difficulty is relatively complicated, the maintenance time is long, and the buffer efficiency is low, and it is unable to simultaneously meet the helicopter landing gear takeoff and landing performance requirements and the landing gear crash resistance performance requirements. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] Therefore, the purpose of the utility model is to provide a dual-chamber dual-throttle valve serial buffer, which can solve the problems that the existing buffer has a large number of parts, is difficult to manufacture, takes a long time to maintain, and has low efficiency, and cannot simultaneously meet the helicopter's landing gear takeoff and landing performance requirements and the landing gear's crash resistance performance requirements.

[0006] In order to solve the above technical problems, the utility model provides a dual-chamber dual-throttle valve serial buffer, adopting the following technical solution: it includes an outer cylinder, characterized in that: an oil chamber is provided in the outer cylinder, a low-pressure piston rod is provided on one side of the outer cylinder, and a high-pressure piston rod is provided on the other side of the outer cylinder, a low-pressure chamber throttle valve is provided on the side of the low-pressure piston rod close to the outer cylinder, and a high-pressure chamber throttle valve is provided on the side of the high-pressure piston rod close to the outer cylinder, a low-pressure chamber is provided in the low-pressure piston rod, and a high-pressure chamber is provided in the high-pressure piston rod.

[0007] Optionally, the low-pressure piston rod and the high-pressure piston rod are both provided with spherical bearings on the sides away from each other.

[0008] By adopting the above technical solution, the buffer is installed.

[0009] Optionally, a low-pressure inflation valve is provided on the side of the bottom of the low-pressure piston rod away from the outer tube, and a high-pressure inflation valve is provided on the side of the bottom of the high-pressure piston rod away from the outer tube.

[0010] Inflation is performed by adopting the above technical solution.

[0011] Optionally, the low-pressure chamber throttle valve includes a first damping fixed plate, four groups of first side oil holes are opened on the first damping fixed plate, a first damping cylinder is arranged in the first damping fixed plate, a first damping orifice is arranged in the first damping cylinder, a first damping valve core is arranged on one side of the first damping orifice, and a first spring is arranged on the outer side of the first damping valve core.

[0012] By adopting the above technical solution, cushioning is performed during normal landing.

[0013] Optionally, the high-pressure chamber throttle valve includes a second damping fixed plate, four groups of second side oil holes are opened on the second damping fixed plate, a second damping cylinder is arranged in the second damping fixed plate, a second damping orifice plate is arranged in the second damping cylinder, a second damping valve core is arranged on one side of the second damping orifice plate, and a second spring is arranged on the outer side of the second damping valve core.

[0014] By adopting the above technical solution, cushioning is provided during a crash.

[0015] Optionally, a floating piston is provided on one side of the second damping cylinder.

[0016] By adopting the above technical solution, the oil and the gas are separated.

[0017] To sum up, the utility model includes at least one of the following beneficial effects: the buffer adopts a symmetrical structure, with piston rods at both ends and an outer cylinder in the middle, and a shared oil chamber inside, which reduces the number of parts and reduces the manufacturing difficulty, improves product reliability, and shortens maintenance time. The low-pressure chamber adopts oil-gas mixing, and the high-pressure chamber adopts oil-gas separation. During normal use, only the low-pressure chamber works, and during a crash, the high and low-pressure chambers work at the same time, so that the helicopter obtains their own travel during normal use and crash resistance, thereby improving the efficiency of the buffer, which can not only meet the helicopter's requirements for the take-off and landing performance of the landing gear, but also meet the helicopter's requirements for the crash resistance performance of the landing gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0020] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0021] Figure 3 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0022] Figure 4 for Figure 1 Schematic diagram of the enlarged structure of part B in the middle.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. outer cylinder; 2. oil chamber; 3. low-pressure piston rod; 301. low-pressure charging valve; 4. low-pressure chamber throttle valve; 401. first damping fixed plate; 4011. first side oil hole; 402. first damping cylinder; 403. first damping orifice; 404. first damping valve core; 405. first spring; 5. low-pressure chamber; 6. high-pressure piston rod; 601. high-pressure charging valve; 7. high-pressure chamber throttle valve; 701. second damping fixed plate; 7011. second side oil hole; 702. second damping cylinder; 703. second damping orifice; 704. second damping valve core; 705. second spring; 706. floating piston; 8. high-pressure chamber; 9. spherical bearing. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-4 The utility model is described in further detail.

[0025] Embodiment 1, refer to Figure 1 In order to solve the problem that the existing buffer has many types of parts, is difficult to manufacture, takes a long time to maintain, and has low efficiency, and cannot simultaneously meet the helicopter's landing gear take-off and landing performance requirements and the landing gear's crash resistance performance requirements, the utility model discloses a double-chamber double-throttle valve serial buffer, including an outer tube 1, characterized in that: an oil chamber 2 is provided in the outer tube 1, a low-pressure piston rod 3 is provided on one side of the outer tube 1, and a high-pressure piston rod 6 is provided on the other side of the outer tube 1, a low-pressure chamber throttle valve 4 is provided on the side of the low-pressure piston rod 3 close to the outer tube 1, a high-pressure chamber throttle valve 7 is provided on the side of the high-pressure piston rod 6 close to the outer tube 1, a low-pressure chamber 5 is provided in the low-pressure piston rod 3, and a high-pressure chamber 8 is provided in the high-pressure piston rod 6.

[0026] Based on the above characteristics, the working principle of this embodiment is: the buffer is compressed during the stroke, and the oil flows from the oil chamber 2 through the low-pressure throttle valve 4 into the low-pressure chamber 5, generating damping to consume part of the energy. At the same time, the air cavity volume of the low-pressure chamber 5 is compressed to absorb part of the energy, and the air pressure inside the low-pressure chamber 5 increases. When the stroke reaches a certain value and the air pressure in the low-pressure chamber 5 is equal to the initial pressure in the high-pressure chamber 8, the high-pressure chamber 8 begins to compress. At this time, the high-pressure chamber 8 is compressed together with the low-pressure chamber 5. During the reverse stroke, the buffer extends. Under the action of gas pressure, the oil flows into the oil chamber 2 through the low-pressure throttle valve 4 and the high-pressure throttle valve 7, generating damping to further consume energy. During normal landing, only the low-pressure chamber works. During a crash, the high-pressure chamber 8 and the low-pressure chamber 5 work simultaneously to absorb more energy.

[0027] Example 2, refer to Figure 2-4 In this embodiment, in order to solve the problem that the existing buffer has many types of parts, is difficult to manufacture, takes a long time to maintain, and has low buffer efficiency, and cannot simultaneously meet the helicopter's landing gear takeoff and landing performance requirements and the landing gear's crash resistance performance requirements, based on the same concept as the above-mentioned embodiment 1, the dual-chamber dual-throttle valve serial buffer also includes a low-pressure piston rod 3 and a high-pressure piston rod 6 on the side away from each other. Both are provided with a joint bearing 9, a low-pressure charging valve 301 is provided on the side of the bottom of the low-pressure piston rod 3 away from the outer tube 1, and a high-pressure charging valve 601 is provided on the side of the bottom of the high-pressure piston rod 6 away from the outer tube 1, and the low-pressure chamber throttle valve 4 includes a first damping fixing plate 401, and the first damping fixing plate 401 is provided with four groups of first side oil holes 401 1. A first damping cylinder 402 is provided in a first damping fixed plate 401, a first damping orifice 403 is provided in the first damping cylinder 402, a first damping valve core 404 is provided on one side of the first damping orifice 403, a first spring 405 is sleeved on the outer side of the first damping valve core 404, a high-pressure chamber throttle valve 7 comprises a second damping fixed plate 701, four groups of second side oil holes 7011 are opened on the second damping fixed plate 701, a second damping cylinder 702 is provided in the second damping fixed plate 701, a second damping orifice 703 is provided in the second damping cylinder 702, a second damping valve core 704 is provided on one side of the second damping orifice 703, a second spring 705 is sleeved on the outer side of the second damping valve core 704, and a floating piston 706 is provided on one side of the second damping cylinder 702.

[0028] Based on the above features, the working principle of this embodiment is: during the reverse stroke, the first damping valve core 404 is pressed on the first damping orifice 403 under the action of the oil, and a central oil hole is opened on the first damping orifice 403. The first damping valve core 404 blocks the central oil hole under the action of the elastic force of the first spring 405, and only the first side oil hole 4011 works. When the movement speed of the piston rod in the positive stroke is relatively low, the action of the oil cannot overcome the elastic force of the first spring 405 to open the central oil hole, and only the first side oil hole 4011 works. When the movement speed of the low-pressure piston rod 3 reaches a certain level, the action of the oil overcomes the elastic force of the first spring 405 to open the central oil hole, and the first side oil hole 4011 and the central oil hole are opened at the same time to reduce the damping force and avoid excessive landing load. When the helicopter vibrates on the ground, the low-pressure piston rod 3 moves at a low speed, and the central oil hole is always in a closed state, providing greater damping to prevent ground resonance. The high-pressure chamber throttle valve 7 is composed of the same components and is fixed to the high-pressure piston rod 6 in the same way; the high-pressure piston rod 6 and the low-pressure piston rod 3 inside the buffer share an oil chamber 2. When installed, the low-pressure piston rod 3 faces upward. The low-pressure chamber 5 separates the oil from the gas due to the different densities of gas and oil. The high-pressure chamber 8 has a built-in floating piston 706 to separate the oil from the gas, thereby forming a low-pressure chamber 5, an oil chamber 2 and a high-pressure chamber 8, wherein the pressure of the high-pressure chamber 8 is higher than that of the low-pressure chamber 5. During normal landing, only the low-pressure chamber 5 works. During a crash, the high-pressure chamber 8 and the low-pressure chamber 5 work at the same time to absorb more energy.

[0029] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A dual-cavity dual-throttle valve serial buffer, comprising an outer cylinder (1), characterized in that: An oil chamber (2) is provided in the outer cylinder (1), a low-pressure piston rod (3) is provided on one side of the outer cylinder (1), a high-pressure piston rod (6) is provided on the other side of the outer cylinder (1), a low-pressure chamber throttle valve (4) is provided on the side of the low-pressure piston rod (3) close to the outer cylinder (1), a high-pressure chamber throttle valve (7) is provided on the side of the high-pressure piston rod (6) close to the outer cylinder (1), a low-pressure chamber (5) is provided in the low-pressure piston rod (3), and a high-pressure chamber (8) is provided in the high-pressure piston rod (6).

2. A dual-cavity dual-throttle valve serial buffer according to claim 1, characterized in that: The low-pressure piston rod (3) and the high-pressure piston rod (6) are both provided with joint bearings (9) on the sides away from each other.

3. The dual-cavity dual-throttle valve serial buffer according to claim 1, characterized in that: A low-pressure inflation valve (301) is provided on the side of the bottom of the low-pressure piston rod (3) away from the outer tube (1), and a high-pressure inflation valve (601) is provided on the side of the bottom of the high-pressure piston rod (6) away from the outer tube (1).

4. A dual-cavity dual-throttle valve serial buffer according to claim 1, characterized in that: The low-pressure chamber throttle valve (4) comprises a first damping fixed plate (401), four groups of first side oil holes (4011) are opened on the first damping fixed plate (401), a first damping cylinder (402) is arranged inside the first damping fixed plate (401), a first damping orifice plate (403) is arranged inside the first damping cylinder (402), a first damping valve core (404) is arranged on one side of the first damping orifice plate (403), and a first spring (405) is sleeved on the outer side of the first damping valve core (404).

5. The dual-cavity dual-throttle valve serial buffer according to claim 1, characterized in that: The high-pressure chamber throttle valve (7) comprises a second damping fixing plate (701), four groups of second side oil holes (7011) are opened on the second damping fixing plate (701), a second damping cylinder (702) is arranged inside the second damping fixing plate (701), a second damping orifice plate (703) is arranged inside the second damping cylinder (702), a second damping valve core (704) is arranged on one side of the second damping orifice plate (703), and a second spring (705) is sleeved on the outer side of the second damping valve core (704).

6. A dual-cavity dual-throttle valve serial buffer according to claim 5, characterized in that: A floating piston (706) is provided on one side of the second damping cylinder (702).

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