External opening device for inflation valve of shock absorber of aircraft hydraulic system

Abstract

The utility model discloses an external opening device for an inflation valve of a shock absorber of an airplane hydraulic system. The external opening device comprises a nut with a deflation groove and a T-shaped bolt. A stepped threaded through hole is formed in the nut along the axis of the nut, the small-diameter section of the stepped threaded through hole is used for being matched with the T-shaped bolt, and the large-diameter section of the stepped threaded through hole is used for being connected with the outer circle of the air inlet end of the damper inflation valve in a matched mode. The end face of the nut is radially provided with a kidney-shaped deflation groove which is communicated with the stepped threaded through hole and is coaxially arranged, and a nitrogen release channel is formed. And an external thread matched with the small-diameter section of the threaded hole of the nut is arranged on the T-shaped bolt rod body. In the opening process, after the end of the T-shaped bolt makes contact with the end face of a sliding valve of the inflation valve, the T-shaped bolt is screwed into 1-1.5 circles of threads, the sliding valve is pushed by the T-shaped bolt to move inwards, a spring in the inflation valve is compressed, an air inlet channel of the inflation valve is opened, nitrogen in the shock absorber is released, and the frosting phenomenon is weakest. According to the device, a nitrogen release route is changed, the operation safety risk of operators is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic systems for aviation equipment, and in particular relates to an external opening device for an air-filled valve of a shock absorber of an aircraft hydraulic system. Background Art

[0002] The hydraulic accumulator in the aircraft hydraulic system is used to reduce the pressure pulse phenomenon caused by the high-pressure oil pump in the system. The piston inside the hydraulic accumulator divides the inner cavity of its shell into an air cavity and a liquid cavity. The nitrogen in the air cavity of the hydraulic accumulator is filled through the external shock absorber charging valve, and the filled nitrogen is used to reduce the pressure pulse generated by the hydraulic system. When the hydraulic accumulator is not in use and the nitrogen in the cavity needs to be released, an open-end wrench is usually used to loosen the conduit joint to slowly release the nitrogen. However, the conduit joint is generally located on the inside of the hydraulic accumulator, and there are other accessories around the conduit joint. Therefore, when discharging nitrogen, the operator is forced to operate in a kneeling or lying posture, which is poor in comfort; the high nitrogen pressure and the nitrogen release point in the cabin will put the operator in an oxygen-deficient environment, which poses a safety risk. In addition, during operation, the conduit insurance will block the operator's line of sight, so the conduit must be disconnected and the conduit insurance must be removed, and the removal of the insurance will cause the generation of redundant objects.

[0003] For this reason, it is very necessary to design a device for opening the outside of the shock absorber charging valve. Utility Model Content

[0004] In order to solve the problems of poor operability and great safety hazards of the existing methods for releasing nitrogen in hydraulic accumulators, the applicant has re-studied the discharge path of nitrogen in hydraulic accumulators. Nitrogen is charged into the air cavity of the hydraulic accumulator through the charging valve installed on the outside of the hydraulic accumulator. It can be considered to open the charging valve to release the nitrogen. However, the charging valve of the hydraulic accumulator used in the aircraft hydraulic system is a one-way valve. It can only overcome the spring force in the charging valve through the external high-pressure gas pressure, so that the valve is opened and inflated inward, and the nitrogen in the air cavity of the hydraulic accumulator will not be discharged in the reverse direction. Therefore, in order to release nitrogen by opening the charging valve, it is necessary to design auxiliary tooling, and the charging valve structure must not be damaged during the opening process.

[0005] Based on the above considerations, the utility model provides an external opening device for the air-filling valve of the shock absorber of the aircraft hydraulic system, comprising a nut and a T-bolt; the nut comprises a coaxially connected hexagonal head and a cylindrical portion, a stepped threaded through hole is provided along the axis of the nut, the small diameter section of the stepped threaded through hole is located in the hexagonal head section, and is used to cooperate with the T-bolt; the large diameter section of the stepped threaded through hole is used to cooperate with the outer circle of the air inlet end of the air-filling valve; a venting groove is radially provided on the end face of the hexagonal head, and the venting groove is connected with the stepped threaded through hole and is coaxially arranged to form a nitrogen release channel. The T-bolt comprises a horizontal handle and a vertical rod body, and the vertical rod body is provided with a section of external thread that cooperates with the small end of the threaded through hole of the nut. When opening, the end of the vertical rod body of the T-bolt contacts the end face of the air-filling valve slide valve, and by screwing in the T-bolt, the slide valve compresses the spring in the air-filling valve, opens the air inlet channel of the air-filling valve, and realizes the release of nitrogen in the shock absorber.

[0006] The applicant has conducted a large number of tests using the opening device of the utility model. The tests found that the deeper the T-bolt is screwed in, the faster the nitrogen is released. However, since the air chamber of the hydraulic accumulator contains high-pressure nitrogen, the nitrogen will absorb a large amount of heat from the external air during the process of changing from high pressure to low pressure, and frost or even ice will appear at the charging valve. Ice or frost will cause damage to the charging valve. When the T-bolt is against the end face of the charging valve slide valve, the threaded section of the T-bolt is screwed in 1 to 1.5 turns, which can not only ensure the smooth release of nitrogen, but also ensure that the frost phenomenon at the charging valve is the weakest, and will not damage the charging valve or the hydraulic shock absorber.

[0007] Furthermore, the waist-shaped groove consists of a rectangular groove and semicircular grooves located at both ends of the rectangular groove. The size of the rectangular groove is 10mm×2mm, and the radius of the semicircular groove is 2mm to prevent damage to the shock absorber due to poor exhaust due to low-temperature icing.

[0008] Furthermore, a backing groove is provided between the large diameter section and the small diameter section of the stepped threaded through hole on the nut.

[0009] Furthermore, the nut and the T-bolt are both made of No. 45 steel.

[0010] Furthermore, after heat treatment, the nut and the T-bolt have an HRC of 35 to 40.

[0011] Furthermore, the surface of the external opening device is bluing treated.

[0012] The advantages of the utility model are:

[0013] The utility model is used for an external opening device of an air-filled valve of a shock absorber of an aircraft hydraulic system, and comprises a nut and a T-bolt. The nut comprises a cylindrical body and a hexagonal head. A threaded through hole is arranged along the axis of the cylindrical body, and an air release groove connected to the threaded through hole is arranged on the end face of the hexagonal head. When opening, the threaded rod of the T-bolt is first inserted into the threaded through hole of the nut. When the end of the threaded rod contacts the end face of the air-filled valve slide valve, the T-bolt is screwed into the thread by 1-1.5 turns, so that the air inlet passage of the air-filled valve is opened, and the nitrogen in the shock absorber is released, and the phenomenon of frost and ice at the air-filled valve causing damage to the air-filled valve or the hydraulic shock absorber is avoided.

[0014] The operating position of the device of the utility model is located outside the hydraulic shock absorber, which improves the comfort of the operator and reduces the operating safety risk of the operator.

[0015] The utility model has a simple structure and is easy to operate, solves the problems of low operating efficiency caused by tricky operating angles and the need to frequently clean and block accessories in the prior art, and greatly improves the nitrogen release efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the opening device of the utility model;

[0017] Figure 2 yes Figure 1 The front view of the middle nut;

[0018] Figure 3 yes Figure 2 A top view of

[0019] Figure 4 yes Figure 2 AA section view;

[0020] Figure 5 yes Figure 1 Front view of the bolt.

[0021] In the figure: 1- nut; 2- T-bolt. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below. The embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0023] Reference Figure 1-Figure 5. An external opening device for the inflation valve of a shock absorber in an aircraft hydraulic system, wherein the inflation valve is a one-way inflation valve, and is used to fill the shock absorber with nitrogen through an external high-pressure air source. The external opening device comprises a nut 1 and a T-bolt 2, wherein the nut 1 comprises a coaxially connected hexagonal head and a cylindrical portion, and the nut 1 is provided with a stepped threaded through hole along its axis, wherein the small diameter section of the stepped threaded through hole is used to cooperate with the thread of the T-bolt, and the small diameter section is located at the hexagonal head; the large diameter section of the stepped threaded through hole is used to cooperate with the outer circle of the air inlet end of the inflation valve, and the end face of the air inlet end of the inflation valve contacts the step face of the stepped threaded through hole. A venting groove is radially provided on the end face of the hexagonal head, and the venting groove is connected with the stepped threaded through hole to form a nitrogen release channel.

[0024] Reference Figure 2-Figure 4 The nut 1 includes a hexagonal head and a cylindrical part that are coaxially connected as one. A stepped threaded through hole is provided on the nut along its axis. The small diameter section of the stepped threaded through hole is located in the hexagonal head and is used to cooperate with the T-bolt thread to fix the T-bolt to prevent the T-bolt from popping out during deflation. The size of the threaded hole in this embodiment is M6×1 and the depth is 7mm. The large diameter section of the stepped threaded through hole is used to cooperate with the outer circle of the air inlet end of the inflation valve, and a back-cut groove is provided between the large diameter section and the small diameter section of the stepped threaded through hole.

[0025] A venting groove is provided just above the hexagonal head of the nut. The venting groove is connected to the central through hole and the axis coincides with the nut to reduce the impact of the nitrogen release pressure on the nut and prevent product damage caused by poor exhaust due to low-temperature icing. Preferably, in order to prevent stress concentration, the overall shape of the venting groove is a waist-shaped groove, which can effectively prevent stress concentration in the corner area. In this embodiment, the rectangular size of the venting groove is 10mm×2mm, and the radius of the semicircle at both ends is 2mm.

[0026] Reference Figure 5 The T-bolt includes a straight handle section and a ∣-shaped connecting section. The ∣-shaped connecting section is provided with an external thread matching the threaded hole on the nut from the end surface. The length of the external thread is greater than the length of the nut. Considering that the inflation valve is located in the wall groove of the fuselage, the length of the T-bolt is determined according to the actual working condition size for easy operation.

[0027] Due to the high pressure during the nitrogen release process, the strength requirements of the nut 1 and the T-bolt 2 are relatively high. In this embodiment, the nut and the T-bolt are made of 45# steel and heat treated to HRC35-40.

[0028] In this embodiment, the surfaces of the nut and the T-bolt are bluing treated to improve the corrosion resistance of the opening device.

[0029] In order to ensure that the contact surfaces of the nut and the T-bolt are smooth and to ensure a certain dimensional accuracy, the nut and the T-bolt are manufactured by wire cutting.

[0030] When the opening device of the utility model is used to release nitrogen in the hydraulic shock absorber, the cylindrical part of the nut 1 is first connected with the outer thread of the air inlet end of the charging valve.

[0031] Then hold the handle end of the T-bolt and continuously screw the threaded section of the T-bolt into the nut 1; when the hand feels the resistance generated by the bolt end contacting the sliding valve of the inflation valve, continue to screw the T-bolt into several turns of thread, so that the T-bolt pushes the sliding valve to move inward, thereby compressing the spring in the inflation valve, opening the inflation valve intake channel, and releasing nitrogen. In order to prevent product damage caused by poor exhaust due to low-temperature icing, in this embodiment, the T-bolt is continuously screwed into 1 to 1.5 turns of thread to release nitrogen, at which time, the frosting phenomenon is the weakest.

[0032] The above description is only a specific implementation mode of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions within the technical scope disclosed in the present utility model, and these modifications or substitutions should be included in the protection scope of the present utility model.

Claims

1. An external opening device for an air-filling valve of a shock absorber in an aircraft hydraulic system, wherein the air-filling valve is a one-way air-filling valve, and is used to fill the shock absorber with nitrogen through an external high-pressure gas source; characterized in that: Includes nuts and T-bolts; The nut comprises a coaxially connected hexagonal head and a cylindrical portion, and a stepped threaded through hole is provided on the nut along its axis, the small diameter section of the stepped threaded through hole is used for matching and connecting with the T-bolt, and the large diameter section of the stepped threaded through hole is used for matching and connecting with the outer circle of the air inlet end of the shock absorber charging valve; the end face of the air inlet end of the charging valve contacts the stepped surface of the stepped threaded through hole; A venting groove is radially arranged on the end surface of the hexagonal head, and the venting groove is connected to the step threaded through hole and is coaxially arranged to form a nitrogen release channel; the venting groove is a waist-shaped groove; The T-bolt comprises a handle section and a connecting section, and the connecting section is provided with an external thread starting from the end surface thereof that matches the threaded hole of the small diameter section of the nut, and the length of the external thread is greater than the length of the nut; When opened, the nut is connected to the air inlet end of the shock absorber charging valve; after the end of the T-bolt connecting section contacts the end face of the sliding valve of the charging valve, the T-bolt is screwed into 1-1.5 turns of thread to push the sliding valve inward, thereby compressing the spring in the charging valve and opening the air inlet passage of the charging valve, thereby releasing nitrogen in the shock absorber and minimizing frosting.

2. The external opening device according to claim 1, characterized in that: The waist-shaped groove consists of a rectangular groove and semicircular grooves at both ends of the rectangular groove. The size of the rectangular groove is 10mm×2mm, and the radius of the semicircular groove is 2mm to prevent damage to the shock absorber due to poor exhaust caused by low-temperature icing.

3. The external opening device according to claim 2, characterized in that: A cutter back groove is arranged between the large diameter section threaded hole and the small diameter section threaded hole on the nut.

4. The external opening device according to claim 3, characterized in that: The nut and the T-bolt are both made of No. 45 steel.

5. The external opening device according to claim 4, characterized in that: After heat treatment, the nut and the T-bolt have an HRC of 35-40.

6. The external opening device according to any one of claims 1 to 5, characterized in that: The surface of the external opening device is bluing treated.

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