Helicopter shock strut high pressure gas equalization and inflation apparatus

Abstract

The application discloses a high-pressure gas balance filling equipment for a helicopter shock strut, and relates to the technical field of helicopter ground maintenance support equipment. The air inlet interface of the filling equipment is used for connecting a high-pressure gas cylinder; the first air outlet is used for connecting one side of the shock strut of the helicopter through a gas conveying pipe; the second air outlet is used for connecting the other side of the shock strut of the helicopter through another gas conveying pipe; the air inlet side of the first gas filling branch is communicated with the air inlet interface, and the air outlet side of the first gas filling branch is communicated with the first air outlet; the air inlet side of the second gas filling branch is communicated with the air inlet interface, and the air outlet side of the second gas filling branch is communicated with the second air outlet; one end of the balance valve is communicated with the first gas filling branch, and the other end of the balance valve is communicated with the second gas filling branch; the balance valve is used for balancing the air pressure of the first gas filling branch and the second gas filling branch. The filling equipment of the technical scheme in the application embodiment effectively improves the high-pressure nitrogen gas filling efficiency and reduces the downtime.

Description

Technical Field

[0001] This application relates to the technical field of helicopter ground maintenance and support equipment, and more specifically to a high-pressure gas balance injection device for helicopter shock absorber struts. Background Technology

[0002] Helicopters, as a crucial component of modern air transport, are widely used in critical areas such as emergency rescue, personnel transport, and logistics. The shock absorber struts in the helicopter landing gear system play a vital role in absorbing landing impacts and mitigating vibrations, directly affecting flight safety and passenger comfort. These struts are filled with high-pressure gas, typically nitrogen, as the working medium. Over long-term use, the pressure of this gas can drop due to aging seals or minor leaks, leading to a decline in shock absorption performance. Therefore, according to aviation maintenance standards, it is essential to periodically replenish the shock absorber struts with high-pressure nitrogen to maintain their designed operating pressure range.

[0003] The inventor was mainly responsible for the nitrogen filling work of the shock absorber struts of the Ka-32 helicopter. During the work, he learned that the nitrogen filling of the shock absorber struts generally uses a simple single-channel nitrogen filling tool. This tool only has a single filling pipeline, and each nitrogen filling operation can only be carried out on one side of the shock absorber strut. The nitrogen filling time is relatively long, and it is not easy to balance the nitrogen pressure on both sides of the shock absorber struts. It is necessary to manually adjust the pressure repeatedly to meet the difference standard of the two sides of the shock absorber struts, which is not efficient. Utility Model Content

[0004] Based on this, the purpose of this application is to provide a high-pressure gas balance injection device for helicopter shock absorber struts to improve inflation efficiency.

[0005] Therefore, this application provides a high-pressure gas balancing injection device for helicopter shock absorber struts, which includes an air inlet, a first air outlet, a second air outlet, a first inflation branch, a second inflation branch, and a balancing valve. The air inlet is used to connect to a high-pressure gas cylinder; the first air outlet is used to connect to one side of the helicopter shock absorber strut through an air supply pipe; the second air outlet is used to connect to the other side of the helicopter shock absorber strut through another air supply pipe; the air inlet side of the first inflation branch is connected to the air inlet, and the air outlet side of the first inflation branch is connected to the first air outlet; the air inlet side of the second inflation branch is connected to the air inlet, and the air outlet side of the second inflation branch is connected to the second air outlet; one end of the balancing valve is connected to the first inflation branch, and the other end is connected to the second inflation branch, and the balancing valve is used to balance the air pressure of the first inflation branch and the second inflation branch.

[0006] In one embodiment, the air intake port is connected to a high-pressure filter, which is connected to a first inflation branch and a second inflation branch.

[0007] In one embodiment, the infusion apparatus further includes a total pressure gauge connected to a high-pressure filter, the total pressure gauge being used to detect the gas pressure output from the high-pressure filter.

[0008] In one embodiment, the first inflation branch includes a first pressure reducing valve, a first branch pressure gauge, a first check valve, and a first front switch valve connected in series, and one end of the balance valve is connected to the pipeline between the first front switch valve and the first air outlet.

[0009] In one embodiment, the first inflation branch further includes a first rear switch valve and a first unloading valve connected in series between the first front switch valve and the first air outlet, and one end of the balance valve is connected to the pipeline between the first front switch valve and the first rear switch valve.

[0010] In one embodiment, the first unloading valve is equipped with a pressure gauge.

[0011] In one embodiment, the second inflation branch includes a second pressure reducing valve, a second branch pressure gauge, a second check valve, and a second front switch valve connected in series, and the other end of the balance valve is connected to the pipeline between the second front switch valve and the second air outlet.

[0012] In one embodiment, the second inflation branch further includes a second rear switch valve and a second unloading valve connected in series between the second front switch valve and the second air outlet, and the other end of the balance valve is connected to the pipeline between the second front switch valve and the second rear switch valve.

[0013] In one embodiment, the second unloading valve is equipped with a pressure gauge.

[0014] In one embodiment, the filling device further includes a housing, with an operation panel on top of the housing, an air inlet located on one side of the housing, a first air outlet and a second air outlet located on the opposite side of the housing, and a first inflation branch and a second inflation branch located inside the housing.

[0015] The high-pressure gas balancing injection device for helicopter shock absorber struts in this application embodiment includes a first inflation branch and a second inflation branch. The shock absorber struts on both sides of the helicopter are respectively connected to the first and second air outlets. A balancing valve is also provided to balance the air pressure of the first and second inflation branches in real time, realizing synchronous inflation of the shock absorber struts on both sides of the helicopter and automatic pressure balancing of the shock absorber struts on both sides. This eliminates the need for repeated pipeline switching and manual adjustment, effectively improving the high-pressure nitrogen injection efficiency and reducing downtime.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application, it can be implemented according to the contents of the specification. In order to make the above and other objects, features and advantages of this application more obvious and understandable, some embodiments are listed below for detailed description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the air circuit connection of the infusion device according to an embodiment of this application.

[0019] Figure 2 , Figure 3 All of these are perspective views of the filling equipment housing in embodiments of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0021] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described in this specification without causing conflict.

[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0025] Existing nitrogen filling tools for helicopter shock absorber struts generally employ a single-channel design. When filling helicopter shock absorber struts with nitrogen, only one side can be operated at a time, resulting in a lengthy filling process. Furthermore, due to the lack of an effective pressure balancing mechanism, it is difficult to achieve precise pressure balance between the two shock absorber struts. Operators often need to manually adjust the pressure repeatedly to meet the pressure difference standard between the two sides, significantly reducing operational efficiency.

[0026] Therefore, one or more embodiments of this application provide a high-pressure gas balancing injection device for helicopter shock absorber struts, which is provided with two parallel inflation branches and connected by a balancing valve. It can be used to simultaneously fill nitrogen into shock absorber struts on both sides, and the inflation pressure of the shock absorber struts on both sides is automatically balanced, which effectively improves the efficiency of nitrogen filling operation.

[0027] Figure 1 The diagram shows the gas circuit connection of the filling equipment. The filling equipment in this embodiment includes an air inlet 31, a first air outlet 41, a second air outlet 42, a first filling branch 10, a second filling branch 20, and a balance valve 50. The air inlet 31 is the inlet for high-pressure nitrogen and is used to connect to a high-pressure gas cylinder (nitrogen cylinder). During nitrogen filling operations, the first air outlet 41 is used to connect to one side of the helicopter's shock absorber strut via a gas supply pipe, while the second air outlet 42 is used to connect to the other side of the helicopter's shock absorber strut via another gas supply pipe, enabling simultaneous nitrogen filling of both sides of the helicopter's shock absorber struts. The first air outlet 41 and the second air outlet 42 use NPT1 / 8 standard quick-connect filling connectors, which can quickly connect to the aircraft's filling interface, are easy to install and remove, and have reliable sealing, adapting to the needs of rapid nitrogen filling operations by aircraft maintenance personnel.

[0028] like Figure 1 As shown, the air inlet side of the first inflation branch 10 is connected to the air inlet 31, and the air outlet side of the first inflation branch 10 is connected to the first air outlet 41. High-pressure gas enters from the air inlet 31, and a portion of the high-pressure gas is discharged through the first air outlet 41 after passing through the first inflation branch 10.

[0029] like Figure 1 As shown, the air inlet side of the second inflation branch 20 is connected to the air inlet port 31, and the air outlet side of the second inflation branch 20 is connected to the second air outlet 42. High-pressure gas enters from the air inlet port 31, and another part of the high-pressure gas is discharged through the second air outlet 42 after passing through the second inflation branch 20.

[0030] like Figure 1 As shown, one end of the balancing valve 50 is connected to the first inflation branch 10, and the other end is connected to the second inflation branch 20. The balancing valve 50 is used to balance the air pressure of the first inflation branch 10 and the second inflation branch 20. In implementation, the balancing valve 50 is a needle-type pressure balancing valve 50.

[0031] Therefore, the high-pressure gas balancing injection device for helicopter shock absorber struts in this application embodiment is provided with a first inflation branch 10 and a second inflation branch 20. The shock absorber struts on both sides of the helicopter are respectively connected to the first air outlet 41 and the second air outlet 42. A balancing valve 50 is also provided to balance the air pressure of the first inflation branch 10 and the second inflation branch 20 in real time, realizing synchronous inflation of the shock absorber struts on both sides of the helicopter and automatic pressure balancing of the shock absorber struts on both sides. This reduces the number of times pipelines are switched and manual adjustments are made, effectively improving the high-pressure nitrogen injection efficiency and reducing downtime.

[0032] like Figure 1 As shown, in one embodiment, the air inlet 31 is connected to a high-pressure filter 32, which is connected to the first charging branch 10 and the second charging branch 20. The high-pressure filter 32 is positioned after the air inlet 31 to ensure that all gas entering the equipment from the high-pressure cylinder is effectively purified before entering subsequent pipelines. The high-pressure filter 32 uses a 10μm precision air inlet filter, which can effectively filter out solid impurities in the high-pressure nitrogen, preventing impurities from wearing down the valve sealing structure and improving the equipment's service life. The high-pressure filter 32 uses a ferrule or manifold to evenly divide the output airflow into two streams, which are input to the first charging branch 10 and the second charging branch 20.

[0033] like Figure 1As shown, in one embodiment, the filling device further includes a total pressure gauge 33, which is connected to the high-pressure filter 32. The total pressure gauge 33 is used to detect the gas pressure output from the high-pressure filter 32, providing the operator with a reference for the total inlet pressure, thereby making a preliminary judgment on the gas source status and filtration effect. In one exemplary embodiment, the total pressure gauge 33 is model YN100III-25MPa.

[0034] By setting a total pressure gauge 33 and connecting it to the high-pressure filter 32, the operator can display the total pressure of the filtered gas in real time and intuitively. Before the gas enters the first filling branch 10 and the second filling branch 20 for pressure reduction and balancing, the actual working pressure at the inlet of the filling equipment can be accurately determined. This not only helps to promptly detect abnormalities such as insufficient gas volume in the high-pressure cylinder or potential blockage in the high-pressure filter 32, thus avoiding filling failures or equipment damage due to unstable or unsuitable pressure, but also provides a reliable pressure reference for subsequent precise gas pressure adjustment, ensuring the safety, accuracy, and efficiency of the entire filling process.

[0035] like Figure 1 As shown, in one embodiment, the first inflation branch 10 includes a first pressure reducing valve 11, a first branch pressure gauge 12, a first check valve 13, and a first front switching valve 14 connected in series. One end of the balance valve 50 is connected to the pipeline between the first front switching valve 14 and the first air outlet 41. The first pressure reducing valve 11 is a precision pressure reducing valve, integrating a first-stage coarse pressure reduction and a second-stage fine adjustment function, which can progressively reduce the pressure of the high-pressure gas source and stably output it within the range of 0-15MPa, accurately matching the standard maintenance pressure of the helicopter shock absorber strut. The first branch pressure gauge 12 is used to monitor in real time whether the gas pressure after pressure reduction meets the requirements. The first check valve 13 is a safety protection element for the gas circuit, allowing only unidirectional flow of high-pressure gas and strictly preventing reverse flow of gas. During forward inflation, the first one-way valve 13 allows smooth airflow. However, when inflation is paused, the machine is stopped, or the onboard pressure exceeds the pressure of the first inflation branch 10, the first one-way valve 13 seals off, effectively preventing high-pressure nitrogen from the helicopter shock absorber strut from flowing back into the equipment pipeline. This avoids damage to the first pressure reducing valve 11, the main pressure gauge 33, and the high-pressure filter 32 from the impact of the high-pressure backflow gas. It also prevents inaccurate inflation and pressure holding failure caused by gas pressure backflow, ensuring the stable and safe operation of the pipeline system. The first front switch valve 14 is the on / off control valve for the first inflation branch 10, and it is only used for manual control of the opening and closing of the first inflation branch 10. The operator opens the first front switch valve 14 when the first inflation branch 10 needs to be used; otherwise, the first front switch valve 14 is closed.

[0036] By connecting a first pressure reducing valve 11, a first branch pressure gauge 12, a first check valve 13, and a first front switch valve 14 in series on the air intake side of the first inflation branch 10, the filling equipment can precisely regulate and control the gas pressure entering the first inflation branch 10, ensuring that the gas pressure injected into the helicopter shock absorber strut meets the preset requirements and avoiding damage to the shock absorber strut due to excessively high or low pressure. The first branch pressure gauge 12 provides real-time pressure monitoring, allowing operators to intuitively grasp the pressure changes during the filling process, thereby enabling precise operation. The first check valve 13 effectively prevents gas backflow, protecting the safety of the high-pressure gas cylinder and the filling equipment, and maintaining the unidirectional flow of gas. The first front switch valve 14 provides independent opening and closing control of the first inflation branch 10, allowing operators to flexibly isolate or connect the gas source of this branch as needed, greatly improving the safety, flexibility, and reliability of equipment operation, and ensuring the accuracy and stability of the helicopter shock absorber strut filling process.

[0037] like Figure 1 As shown, in one embodiment, the first inflation branch 10 further includes a first rear switch valve 15 and a first unloading valve 16 connected in series between the first front switch valve 14 and the first air outlet 41. One end of the balance valve 50 is connected to the pipeline between the first front switch valve 14 and the first rear switch valve 15. The first rear switch valve 15 serves as an inflation terminal switch, specifically used to control the nitrogen inflation, pressure holding, pipe sealing, and pressure relief operations of the shock absorber strut. During inflation, the first rear switch valve 15 is opened to inflate the shock absorber strut. After the pressure reaches the target, the first rear switch valve 15 is closed to lock the pressure at the end of the shock absorber strut, and then the inflation connector connected to the first air outlet 41 is disassembled, effectively preventing pressure leakage during connector disassembly and ensuring inflation accuracy. The first unloading valve 16 is used to automatically release pressure when the pressure exceeds a threshold to ensure safety.

[0038] like Figure 1 As shown, in one embodiment, the first unloading valve 16 is equipped with a pressure gauge 17, which works in conjunction with the first branch pressure gauge 12 to form a dual-gauge redundancy monitoring system for inflation pressure. It can simultaneously read MPa and PSI values, which meets aviation maintenance reading standards and ensures that the inflation data is accurate and traceable.

[0039] like Figure 1As shown, in one embodiment, the second inflation branch 20 includes a second pressure reducing valve 21, a second branch pressure gauge 22, a second check valve 23, and a second front switch valve 24 connected in series. The other end of the balance valve 50 is connected to the pipeline between the second front switch valve 24 and the second outlet 42. The second pressure reducing valve 21 is a precision pressure reducing valve, integrating a first-stage coarse pressure reduction and a second-stage fine adjustment function, which can progressively reduce the pressure of the high-pressure gas source and stably output it within the range of 0-15MPa, accurately matching the standard maintenance pressure of the helicopter shock absorber strut. The second branch pressure gauge 22 is used to monitor in real time whether the gas pressure after pressure reduction meets the requirements. The second check valve 23 is a safety protection element for the gas circuit, allowing only one-way flow of high-pressure gas and strictly preventing reverse flow of gas. During forward inflation, the second one-way valve 23 allows smooth gas flow. However, when inflation is paused, the machine is stopped, or the onboard pressure exceeds the pressure of the second inflation branch 20, the second one-way valve 23 seals off, effectively preventing high-pressure nitrogen from the helicopter shock absorber strut from flowing back into the equipment pipeline. This avoids damage to the second pressure reducing valve 21, the main pressure gauge 33, and the high-pressure filter 32 from the impact of the high-pressure backflow gas. It also prevents inaccurate inflation and pressure holding failure caused by gas pressure backflow, ensuring the stable and safe operation of the pipeline system. The second front switch valve 24 is the on / off control valve for the second inflation branch 20, and it is only used for manual control of the opening and closing of the second inflation branch 20. Operators open the second front switch valve 24 when they need to use the second inflation branch 20; otherwise, they close it.

[0040] By connecting a second pressure reducing valve 21, a second branch pressure gauge 22, a second one-way valve 23, and a second front switch valve 24 in series on the air intake side of the second inflation branch 20, the filling equipment can precisely regulate and control the gas pressure entering the second inflation branch 20, ensuring that the gas pressure injected into the helicopter shock absorber strut meets the preset requirements and avoiding damage to the shock absorber strut due to excessively high or low pressure. The second branch pressure gauge 22 provides real-time pressure monitoring, allowing operators to intuitively grasp the pressure changes during the filling process, thereby enabling precise operation. The second one-way valve 23 effectively prevents gas backflow, protecting the safety of the high-pressure gas cylinder and the filling equipment, and maintaining the unidirectional flow of gas. The second front switch valve 24 provides independent opening and closing control of the second inflation branch 20, allowing operators to flexibly isolate or connect the gas source of this branch as needed, greatly improving the safety, flexibility, and reliability of equipment operation, and ensuring the accuracy and stability of the helicopter shock absorber strut filling process.

[0041] like Figure 1As shown, in one embodiment, the second inflation branch 20 further includes a second rear switch valve 25 and a second unloading valve 26 connected in series between the second front switch valve 24 and the second outlet 42. The other end of the balance valve 50 is connected to the pipeline between the second front switch valve 24 and the second rear switch valve 25. The second rear switch valve 25 serves as an inflation terminal switch, specifically used to control the nitrogen inflation, pressure holding, pipe sealing, and pressure relief operations of the shock absorber strut. During inflation, the second rear switch valve 25 is opened to inflate the shock absorber strut. After the pressure reaches the target, the second rear switch valve 25 is closed to lock the pressure at the end of the shock absorber strut, and then the inflation connector connected to the second outlet 42 is disassembled, effectively preventing pressure leakage during connector disassembly and ensuring inflation accuracy. The second unloading valve 26 is used to automatically release pressure when the pressure exceeds a threshold to ensure safety.

[0042] like Figure 1 As shown, in one embodiment, the second unloading valve 26 is equipped with a pressure gauge 27, which works in conjunction with the second branch pressure gauge 22 to form a dual-gauge redundancy monitoring system for inflation pressure. It can simultaneously read MPa and PSI values, which meets aviation maintenance reading standards and ensures that the inflation data is accurate and traceable.

[0043] The first inflation branch 10 and the second inflation branch 20 are symmetrical and independent of each other, enabling single-circuit independent nitrogen filling or dual-circuit synchronous isobaric nitrogen filling. For example, when using the first inflation branch 10 for nitrogen filling alone, the balance valve 50 and the second front switch valve 24 are closed. At this time, there is no gas output from the second outlet 42, and the first outlet 41 outputs high-pressure gas. When using the second inflation branch 20 for nitrogen filling alone, the balance valve 50 and the first front switch valve 14 are closed. At this time, there is no gas output from the first outlet 41, and the second outlet 42 outputs high-pressure gas. During dual-circuit synchronous isobaric filling, the balance valve 50, the first front switch valve 14, the first rear switch valve 15, the second front switch valve 24, and the second rear switch valve 25 are opened. At this time, the first outlet 41 and the second outlet 42 output high-pressure gas at the same pressure.

[0044] During implementation, the various components within the injection equipment can be connected via high-pressure resistant hoses or rigid pipes, or a combination of both, to achieve air circuit connections; no restrictions are imposed here.

[0045] like Figure 2 As shown, in one embodiment, the filling equipment also includes a housing 60. The housing 60 serves as the load-bearing base of the filling equipment. It is formed entirely of bent stainless steel sheet, exhibiting high structural rigidity and lightweight design. The stainless steel sheet can withstand impacts from the apron and corrosion from coastal salt spray, facilitating convenient transport and on-site parking. The four corners of the housing 60 are equipped with locking casters 61, allowing for easy relocation by a single person. Locking the casters 61 secures the filling equipment, preventing slippage during nitrogen filling operations.

[0046] Combination Figure 2 and Figure 3 As shown, the control panel 62 is located on the top of the housing 60. The air inlet 31 is located on one side of the housing 60, and the first air outlet 41 and the second air outlet 42 are located on the opposite side of the housing 60. The pressure gauge in the center of the control panel 62 is the main pressure gauge 33, and the pressure gauges on either side are the first branch pressure gauge 12 and the second branch pressure gauge 22, respectively. Below the first branch pressure gauge 12 is the first air pressure adjustment knob 63, which is connected to the first pressure reducing valve and can be used to adjust the output air pressure of the first inflation branch. Below the second branch pressure gauge 22 is the second air pressure adjustment knob 64, which is connected to the second pressure reducing valve and can be used to adjust the output air pressure of the second inflation branch. Three operating switches are located at the bottom of the control panel 62: the middle operating switch 65 controls the opening and closing of the balance valve, the left operating switch 66 controls the opening and closing of the first rear switch valve, and the right operating switch 67 controls the opening and closing of the second rear switch valve.

[0047] During implementation, both the first and second inflation branches are located inside the housing 60, which protects the components of the first and second inflation branches and also prevents them from becoming cluttered.

[0048] The above examples are merely illustrative of the technical content of this application to facilitate reader understanding, but do not imply that the implementation methods of this application are limited to these. Any technical extensions or re-creations made based on this application are protected by this application. The scope of protection of this application is determined by the claims.

Claims

1. A high-pressure gas balancing injection device for helicopter shock absorber struts, characterized in that, It includes: An air inlet, which is used to connect a high-pressure gas cylinder; The first air outlet is used to connect to the shock absorber strut on one side of the helicopter via an air supply pipe. The second air outlet is used to connect to the shock absorber strut on the other side of the helicopter through another air supply pipe. The first inflation branch has an air inlet side connected to an air inlet port and an air outlet side connected to the first air outlet. The second inflation branch has an air inlet side connected to an air inlet port and an air outlet side connected to the second air outlet. A balancing valve, one end of which is connected to the first inflation branch and the other end of which is connected to the second inflation branch, is used to balance the air pressure of the first inflation branch and the second inflation branch.

2. The high-pressure gas balance injection equipment for helicopter shock absorber struts as described in claim 1, characterized in that, The air intake port is connected to a high-pressure filter, which is connected to the first inflation branch and the second inflation branch respectively.

3. The high-pressure gas balance injection equipment for helicopter shock absorber struts as described in claim 2, characterized in that, It also includes a total pressure gauge connected to the high-pressure filter, which is used to detect the gas pressure output from the high-pressure filter.

4. The high-pressure gas balancing injection equipment for helicopter shock absorber struts as described in claim 1, characterized in that, The first inflation branch includes a first pressure reducing valve, a first branch pressure gauge, a first check valve, and a first front switch valve connected in series. One end of the balance valve is connected to the pipeline between the first front switch valve and the first air outlet.

5. The high-pressure gas balancing injection equipment for helicopter shock absorber struts as described in claim 4, characterized in that, The first inflation branch also includes a first rear switch valve and a first unloading valve connected in series between the first front switch valve and the first air outlet, and one end of the balance valve is connected to the pipeline between the first front switch valve and the first rear switch valve.

6. The high-pressure gas balance injection equipment for helicopter shock absorber struts as described in claim 5, characterized in that, The first unloading valve is equipped with a pressure gauge.

7. The high-pressure gas balance injection equipment for helicopter shock absorber struts as described in claim 1, characterized in that, The second inflation branch includes a second pressure reducing valve, a second branch pressure gauge, a second check valve, and a second front switch valve connected in series. The other end of the balance valve is connected to the pipeline between the second front switch valve and the second air outlet.

8. The high-pressure gas balancing injection equipment for helicopter shock absorber struts as described in claim 7, characterized in that, The second inflation branch also includes a second rear switch valve and a second unloading valve connected in series between the second front switch valve and the second air outlet, and the other end of the balance valve is connected to the pipeline between the second front switch valve and the second rear switch valve.

9. The high-pressure gas balance injection equipment for helicopter shock absorber struts as described in claim 8, characterized in that, The second unloading valve is equipped with a pressure gauge.

10. The high-pressure gas balancing injection device for helicopter shock absorber struts as described in any one of claims 1-9, characterized in that, It also includes a housing, on which is an operation panel. The air inlet is located on one side of the housing, and the first and second air outlets are located on the opposite side of the housing. The first and second inflation branches are located inside the housing.

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