Hydraulic oil filtering device of airplane wheel brake system

Abstract

The utility model belongs to the field of hydraulic / cold air systems in the aviation technology, and relates to a hydraulic oil filtering device of an airplane wheel braking system, which comprises a braking valve, an anti-stagnation braking electromagnetic valve or an electro-hydraulic pressure servo valve, a first filtering assembly and a second filtering assembly, the output end of the braking valve is connected with the input end of the first filtering assembly, and the output end of the first filtering assembly is connected with the output end of the electro-hydraulic pressure servo valve. The output end of the first filter assembly is connected with the input end of the anti-stagnation brake electromagnetic valve or the electro-hydraulic pressure servo valve, the output end of the anti-stagnation brake electromagnetic valve or the electro-hydraulic pressure servo valve is connected with the input end of the second filter assembly, and the output end of the second filter assembly is connected with the brake airplane wheel. The oil filter can be used for filtering the oil of the hydraulic oil circuit of the airplane wheel brake system, so that the safety of an airplane is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of hydraulic pressure / cooling air system of aviation technology, and relates to a hydraulic oil filtering device of an aircraft wheel brake system. Background Art

[0002] According to the "Aircraft Control Systems and Hydraulic System Design" manual, wheel brake control systems are divided into inertial anti-skid brake control systems, electronic anti-skid brake control systems, and electric brake control systems. The principles of the wheel brake hydraulic oil circuits are basically the same. When designing the wheel brake hydraulic oil circuit of the aircraft wheel brake control system, the brake pipeline from the brake valve to the brake wheel is a cecal segment, so the brake system hydraulic oil circuit has poor self-cleaning ability; when the aircraft brakes, a large amount of heat is generated, which will cause the oil in the brake pipeline to oxidize and deteriorate at high temperature and produce internal pollutants; the oil filter is a one-way filter for impurities in the oil, and it is impossible to install an oil filter in the brake system hydraulic oil circuit to filter pollutants in the system. Specifically:

[0003] ① Every time the brake valve (or decompression valve) is pressed, the oil entering each brake wheel of the wheel brake system is at the milliliter level, and the oil returned when the brake is released is also at the milliliter level. Due to the small flow rate, the pollutants in the hydraulic pipeline of the brake system are difficult to be carried out with the oil, which is easy to cause siltation. Therefore, the self-cleaning ability of the hydraulic oil circuit of the brake system is poor; ② When the aircraft brakes, the brake device absorbs a large amount of aircraft kinetic energy in a very short time and generates brake heat. The brake cylinder (with a hydraulically driven piston inside, generates axial force and presses against the dynamic and static brake discs, generates braking torque and absorbs the dynamic energy of the aircraft when landing ③ The brake heat energy converted from the energy and dynamic impact load will generate a large amount of heat, causing the oil in the brake line to oxidize and deteriorate at high temperature, producing internal pollutants. Since the brake oil pipelines are all cecal segments, during the braking-releasing process, the external pollutants in the brake line oil and the internal pollutants generated will move up along the brake line oil, and may recoil into the hydraulic accessories to cause jamming; ③ Since the oil filter is a single-direction filter for impurities in the oil, reverse installation can easily damage the filter element in the oil filter, so it is impossible to install an oil filter in the brake system hydraulic oil circuit to filter the pollutants in the system. Due to their own structure and working conditions, the hydraulic oil circuits of all aircraft brake systems have poor oil self-cleaning ability and are easily contaminated by internal and external factors.

[0004] Since the hydraulic oil circuit of the aircraft wheel brake system is a cecal segment, it is easy to generate internal pollutants during operation. With the increase of aircraft flight hours and calendar years, pollutants are continuously generated and accumulated. In addition, it is impossible to install an oil filter to filter the oil. Therefore, the oil contamination of the aircraft brake system cannot be controlled, and hydraulic accessories often get stuck, making it impossible to ensure effective braking and control of the aircraft during takeoff, landing, taxiing, and turning. The aircraft may even run off the runway or have a tire burst, making it impossible to guarantee the safety of the aircraft's takeoff and landing.

[0005] In order to reduce or even eliminate the jamming of hydraulic accessories of the brake system and ensure the safety of the aircraft, a hydraulic oil filter device for an aircraft wheel brake system is needed to filter the oil in the hydraulic oil circuit of the aircraft wheel brake system to ensure the safety of the aircraft. Utility Model Content

[0006] Technical problem solved by the utility model: The purpose of the utility model is to solve the problem that the hydraulic pipeline of the aircraft wheel brake system cannot be installed with an oil filter to filter the working oil due to its own structure and working conditions, resulting in frequent jamming of hydraulic accessories, inability to ensure effective braking and control of the aircraft during takeoff, landing, taxiing and turning, and even causing the aircraft to run off the runway or the aircraft tire to burst. The utility model provides a safe, reliable and low-cost hydraulic oil filtering device for the aircraft wheel brake system.

[0007] The technical solution of this utility model:

[0008] A hydraulic oil filtering device for an aircraft wheel brake system includes a brake valve 6, an anti-lock brake solenoid valve 7 or an electro-hydraulic pressure servo valve 8, and also includes a first filter assembly and a second filter assembly. The output end of the brake valve 6 is connected to the input end of the first filter assembly, the output end of the first filter assembly is connected to the input end of the anti-lock brake solenoid valve 7 or the electro-hydraulic pressure servo valve 8, the output end of the anti-lock brake solenoid valve 7 or the electro-hydraulic pressure servo valve 8 is connected to the input end of the second filter assembly, and the output end of the second filter assembly is connected to the brake wheel 9.

[0009] Furthermore, the first filter assembly and the second filter assembly have completely the same structure.

[0010] Further, the first filter assembly includes a first one-way valve 1, a second one-way valve 2, a third one-way valve 3, a fourth one-way valve 4 and an oil filter 5, the input end of the first one-way valve 1 is connected to the output end of the brake valve, and the output end of the first one-way valve 1 is respectively connected to the output end of the second one-way valve 2 and the input end of the oil filter 5; the input end of the second one-way valve 2 is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve; the output end of the third one-way valve 3 is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve, and the input end of the third one-way valve 3 is respectively connected to the input end of the fourth one-way valve 4 and the output end of the oil filter 5; the output end of the fourth one-way valve 4 is connected to the output end of the brake valve.

[0011] Further, the second filter assembly includes a first one-way valve 1, a second one-way valve 2, a third one-way valve 3, a fourth one-way valve 4 and an oil filter 5, the input end of the first one-way valve 1 is connected to the output end of the brake valve, and the output end of the first one-way valve 1 is respectively connected to the output end of the second one-way valve 2 and the input end of the oil filter 5; the input end of the second one-way valve 2 is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve; the output end of the third one-way valve 3 is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve, and the input end of the third one-way valve 3 is respectively connected to the input end of the fourth one-way valve 4 and the output end of the oil filter 5; the output end of the fourth one-way valve 4 is connected to the output end of the brake valve.

[0012] Furthermore, the filtration accuracy of the oil filter 5 is 1 to 10 μm.

[0013] Furthermore, the working pressure and flow rate of the first one-way valve 1 , the second one-way valve 2 , the third one-way valve 3 , the fourth one-way valve 4 , and the oil filter 5 all meet the aircraft design requirements.

[0014] Beneficial effects of the utility model:

[0015] The utility model has low installation cost, simple tools, simplified operation, convenient use and high installation efficiency.

[0016] 1) The utility model is composed of four one-way valves and one oil filter, with a short development cycle and low cost;

[0017] 2) The utility model is mature in technology, easy to implement, safe and reliable, and light in weight per unit, and will not cause a significant increase in the weight of the hydraulic oil circuit of the aircraft brake system;

[0018] 3) After the use of the utility model, the pollutants in the hydraulic pipeline oil of the aircraft wheel brake system are effectively controlled, the viscosity and lubricity of the oil can be maintained, the deterioration of the oil can be delayed, the inspection and oil testing cycle of the brake system can be extended, and the daily maintenance costs of factories and users can be reduced;

[0019] 4) The utility model can fully filter the pollutants in the hydraulic pipeline oil of the aircraft wheel brake system, prevent the hydraulic accessories from getting stuck, reduce the system failure rate, reduce the workload and cost of replacing finished accessories and oil in factories and troops, and improve factory production efficiency;

[0020] 5) The utility model can ensure the flight safety of the aircraft, avoid flight grade accidents, and protect the life of the pilot, equipment and property safety;

[0021] 6) The utility model can be extended to the hydraulic pipelines of all aircraft wheel brake systems, and has great promotion value;

[0022] 7) The utility model can also be extended to other equipment besides aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the filter assembly of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the hydraulic oil filter device of the aircraft wheel brake system of the utility model. Figure 1 ;

[0025] Figure 3 This is a schematic diagram of the structure of the hydraulic oil filter device of the aircraft wheel brake system of the utility model. Figure 2 ;

[0026] Among them, 1-first one-way valve, 2-second one-way valve, 3-third one-way valve, 4-fourth one-way valve, 5-oil filter, 6-brake valve, 7-anti-lag brake solenoid valve, 8-electro-hydraulic pressure servo valve, 9-brake wheel. DETAILED DESCRIPTION

[0027] The utility model is further introduced below in conjunction with the accompanying drawings:

[0028] like Figure 2 and 3 As shown, a hydraulic oil filtering device for an aircraft wheel brake system includes a brake valve 6, an anti-lock brake solenoid valve 7 or an electro-hydraulic pressure servo valve 8, and also includes a first filter assembly and a second filter assembly. The output end of the brake valve 6 is connected to the input end of the first filter assembly, the output end of the first filter assembly is connected to the input end of the anti-lock brake solenoid valve 7 or the electro-hydraulic pressure servo valve 8, the output end of the anti-lock brake solenoid valve 7 or the electro-hydraulic pressure servo valve 8 is connected to the input end of the second filter assembly, and the output end of the second filter assembly is connected to the brake wheel 9.

[0029] In the present invention, the first filter assembly and the second filter assembly have completely the same structure.

[0030] In the utility model, the first filter assembly includes a first one-way valve 1, a second one-way valve 2, a third one-way valve 3, a fourth one-way valve 4 and an oil filter 5. The input end of the first one-way valve 1 is connected to the output end of the brake valve, and the output end of the first one-way valve 1 is respectively connected to the output end of the second one-way valve 2 and the input end of the oil filter 5; the input end of the second one-way valve 2 is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve; the output end of the third one-way valve 3 is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve, and the input end of the third one-way valve 3 is respectively connected to the input end of the fourth one-way valve 4 and the output end of the oil filter 5; the output end of the fourth one-way valve 4 is connected to the output end of the brake valve.

[0031] In the utility model, the second filter assembly includes a first one-way valve 1, a second one-way valve 2, a third one-way valve 3, a fourth one-way valve 4 and an oil filter 5. The input end of the first one-way valve 1 is connected to the output end of the brake valve, and the output end of the first one-way valve 1 is respectively connected to the output end of the second one-way valve 2 and the input end of the oil filter 5; the input end of the second one-way valve 2 is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve; the output end of the third one-way valve 3 is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve, and the input end of the third one-way valve 3 is respectively connected to the input end of the fourth one-way valve 4 and the output end of the oil filter 5; the output end of the fourth one-way valve 4 is connected to the output end of the brake valve.

[0032] In the present invention, the filtering accuracy of the oil filter 5 is 1 to 10 μm.

[0033] In the utility model, the working pressure and flow rate of the first one-way valve 1, the second one-way valve 2, the third one-way valve 3, the fourth one-way valve 4 and the oil filter 5 all meet the design requirements of the aircraft.

[0034] Combined with Figure 2 , providing an aircraft wheel brake system hydraulic oil filter device, adding a Figure 1 The filtering device; when braking, the high-pressure oil passes through the brake valve 6, Figure 1 The filtering device (first one-way valve 1, oil filter 5, third one-way valve 3), anti-lock brake solenoid valve 7, Figure 1 The filtering device (first one-way valve 1, oil filter 5, third one-way valve 3) reaches the brake wheel 9 to brake. Figure 1 The filter device shown in the figure filters the oil to ensure the cleanliness of the oil and the safety of the brake system; when the brake is released, the oil flows out from the brake wheel 9 and passes through Figure 1 The filtering device (second one-way valve 2, oil filter 5, fourth one-way valve 4), anti-lock brake solenoid valve 7 returns to the aircraft hydraulic system tank, through Figure 1 The filtering device (second one-way valve 2, oil filter 5, fourth one-way valve 4) and brake valve 6 return to the aircraft hydraulic system tank. Figure 1 The devices shown filter the oil to ensure oil cleanliness and system safety.

[0035] Combined with Figure 3 , providing a hydraulic oil filter device for an aircraft wheel brake system, adding a filter after the brake valve 6 and the electro-hydraulic pressure servo valve 8 Figure 1 When braking, high pressure oil passes through the brake valve 6, Figure 1 The filtering device shown (first one-way valve 1, oil filter 5, third one-way valve 3), electro-hydraulic pressure servo valve 8, Figure 1 The filtering device (first one-way valve 1, oil filter 5, third one-way valve 3) reaches the brake wheel 9 to brake. Figure 1 The filter device shown in the figure filters the oil to ensure the cleanliness of the oil and the safety of the brake system; when the brake is released, the oil flows out from the brake wheel 9 and passes through Figure 1 The filtering device (second one-way valve 2, oil filter 5, fourth one-way valve 4), electro-hydraulic pressure servo valve 8 returns to the aircraft hydraulic system tank, through Figure 1 The filtering device (second one-way valve 2, oil filter 5, fourth one-way valve 4) and brake valve 6 return to the aircraft hydraulic system tank. Figure 1 The devices shown filter the oil to ensure oil cleanliness and system safety.

[0036] The utility model provides a hydraulic oil filter device for an aircraft wheel brake system, comprising 4 one-way valves and 1 oil filter. The utility model is safe, reliable, easy to implement and low in cost. The utility model overcomes the problem that the hydraulic oil circuit of the existing aircraft wheel brake system generates a lot of pollutants due to its own structure and working conditions, and it is impossible to install an oil filter separately to filter the oil, and overcomes the disadvantage that the hydraulic accessories are stuck due to oil contamination, causing aircraft flight hazards or graded flight accidents.

Claims

1. A hydraulic oil filter device for an aircraft wheel brake system, comprising a brake valve, an anti-lock brake solenoid valve or an electro-hydraulic pressure servo valve, characterized in that: It also includes a first filter assembly and a second filter assembly, wherein the brake valve output end is connected to the first filter assembly input end, the first filter assembly output end is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve, the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve output end is connected to the second filter assembly input end, and the second filter assembly output end is connected to the brake wheel.

2. The hydraulic oil filter device for an aircraft wheel brake system according to claim 1, characterized in that: The first filter assembly and the second filter assembly have exactly the same structure.

3. The hydraulic oil filter device for an aircraft wheel brake system according to claim 2, characterized in that: The first filter assembly includes a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve and an oil filter. The input end of the first one-way valve is connected to the output end of the brake valve, and the output end of the first one-way valve is respectively connected to the output end of the second one-way valve and the input end of the oil filter; the input end of the second one-way valve is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve; the output end of the third one-way valve is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve, and the input end of the third one-way valve is respectively connected to the input end of the fourth one-way valve and the output end of the oil filter; the output end of the fourth one-way valve is connected to the output end of the brake valve.

4. The hydraulic oil filter device for an aircraft wheel brake system according to claim 3, characterized in that: The second filter assembly includes a first one-way valve, a second one-way valve, a third one-way valve, a fourth one-way valve and an oil filter. The input end of the first one-way valve is connected to the output end of the brake valve, and the output end of the first one-way valve is respectively connected to the output end of the second one-way valve and the input end of the oil filter; the input end of the second one-way valve is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve; the output end of the third one-way valve is connected to the input end of the anti-lag brake solenoid valve or the electro-hydraulic pressure servo valve, and the input end of the third one-way valve is respectively connected to the input end of the fourth one-way valve and the output end of the oil filter; the output end of the fourth one-way valve is connected to the output end of the brake valve.

5. The hydraulic oil filter device for an aircraft wheel brake system according to claim 2, characterized in that: The filtration accuracy of the oil filter is 1 to 10 μm.

6. The hydraulic oil filter device for an aircraft wheel brake system according to claim 4, characterized in that: The working pressure and flow rate of the first one-way valve, the second one-way valve, the third one-way valve, the fourth one-way valve and the oil filter all meet the aircraft design requirements.

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