Oil injection and exhaust method for brake hydraulic system of rotor

Abstract

The invention relates to the technical field of aviation maintenance, in particular to an oil injection and exhaust method for a brake hydraulic system of a rotor wing, which comprises the following steps of: connecting external oil supply equipment with a quick release end and a fixed end of a self-sealing valve respectively, then pressurizing and injecting oil, and matching with opening and closing of an oil discharge switch and movement of a piston in an isolation pressure transmitter; gas in a pipeline is fully released through the deflation valve and the rotor brake small oil tank. The positions where gas residues possibly exist in all the pipelines are fully considered in each oil injection and exhaust process, the internal oil pressure value is obtained through dynamic brake and static brake pressure detection for result inspection, the whole exhaust method is reasonable in logic, too many tedious steps of structural improvement and operation are not needed, and the cost is low. The method has high practical value for rapidly and effectively discharging gas generated in various repair scales in the rotor wing repair process, can be used for reference to related similar fields, and provides great help for the maintenance quality and efficiency of the rotor wing.

Description

Technical Field

[0001] The invention relates to the technical field of aviation maintenance, in particular to an oil filling and exhaust method for a brake hydraulic system of a rotor. Background Art

[0002] During routine maintenance of aircraft rotors, it is necessary to discharge impurities and air from the brake hydraulic system pipelines, isolation pressure transmitters, auxiliary oil tanks and rotor brake devices by injecting oil to ensure the normal operation of the brake device. This is called the oil injection and exhaust method.

[0003] There are two ways to fill and exhaust the brake hydraulic system of an aircraft rotor in the prior art. One is to fill and exhaust the pipeline and accessories (such as accessories) by repeatedly using the rotor brake device. Figure 1 ), and another method is to pressurize the oil at the oil drain port of the rotor brake device and drain the oil and air at the auxiliary oil tank (such as the attached Figure 2 ).

[0004] However, in the above-mentioned prior arts, since the former is a scenario in which a single accessory or a single pipeline is replaced in daily use, only a small amount of oil leaks out from the rotor brake hydraulic system and little air enters. Therefore, the rotor brake device can be used multiple times for oil filling and exhaust. However, it is not suitable for oil filling and exhaust during large-scale factory repairs.

[0005] In the latter case, since the pipelines and accessories were removed during the large-scale repair process in the factory, there will be no oil inside the pipelines and accessories after reinstallation, and a large amount of gas will exist. The oil is pressurized into the oil drain port of the rotor brake device, and the oil is discharged at the auxiliary oil tank, thereby establishing a high-pressure hydraulic oil circulation pipeline, and the air is brought out by the flow of hydraulic oil. Although it is suitable for large-scale repair processes in factories, the solubility of air in hydraulic oil is about 10%, and it cannot be completely dissolved in the oil. And because the rotor brake device has a U-shaped structure, air will remain in the upper part of both sides of the rotor brake device, and because the rotor brake device and part of the pipeline are high in the fuselage, each injection of hydraulic oil can only drive a small part of the gas to flow downward from the rotor brake device and pipeline (such as the attached Figure 2 ), so there are disadvantages such as low exhaust efficiency, long exhaust time, and a large number of people required.

[0006] Based on the above reasons, the present invention designs an oil filling and exhaust method for a rotor brake hydraulic system. Based on the analysis of the principle and installation method of the rotor brake hydraulic system, the basic method of low-point oil filling and high-point exhaust is utilized in combination with the performance characteristics of the self-sealing valve, which can completely eliminate the air in the accessories and pipelines of the rotor brake hydraulic system, thereby improving the oil filling and exhaust quality and work efficiency while reducing personnel input. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for oil filling and exhausting of a rotor brake hydraulic system. Based on the analysis of the principle and installation method of the rotor brake hydraulic system, the basic method of low-point oil filling and high-point exhausting is utilized in combination with the performance characteristics of a self-sealing valve, so that the air in the accessories and pipelines of the rotor brake hydraulic system can be completely eliminated, thereby improving the oil filling and exhausting quality and work efficiency while reducing personnel input.

[0008] The present invention provides an oil filling and exhaust method for a brake hydraulic system of a rotor, comprising the following steps: S1, loosen the nut of the pipe joint outer sleeve of the pressure supply port of the isolation pressure transmitter by 2 to 3 turns, pull the rotor brake control handle to the rear position, and let the hydraulic oil flow out from the pipe joint until there are no bubbles in the overflowed hydraulic oil, and then tighten the nut of the pipe joint outer sleeve; S2, turn the rotor brake control handle to the forward position; S3, disconnect the self-sealing valve, connect the fixed end of the external oil supply equipment pipeline to the quick-release end of the self-sealing valve on the rotor, so as to form an oil filling port; S4, loosen the air bleed valve plug cap of the rotor brake device by one turn. S5, starting the external oil supply device in step S3, slowly opening its pressure supply valve to fill the pipeline with oil, so that the hydraulic oil with gas in the pipeline flows out from the air release valve; S6, until there are no bubbles in the hydraulic oil flowing out of the air release valve, stop starting the external oil supply equipment; S7, rest for 5 to 10 minutes, perform S5 to S6 again, and repeat this rhythm 2 to 3 times; S8, disconnect the fixed end of the external oil supply equipment pipeline from the quick-release end of the self-sealing valve on the rotor; S9, replace the fixed end of the external oil supply equipment pipeline with a quick-release end; S10, connect the quick-release end of the external oil supply equipment pipeline to the fixed end of the self-sealing valve on the rotor; S11, remove the cover of the rotor brake small oil tank and install its process joint, and connect the process hose to the process joint, and connect the other end of the process hose to the oil drain barrel; S12, move the safety handle backward to turn the oil drain switch to the closed position, and turn the rotor brake control handle to the forward position to move the piston of the isolation pressure transmitter to the left; S13, following S12, starts the external oil supply device, slowly opens its pressure supply valve to fill the pipeline with oil, so that the hydraulic oil with gas in the pipeline flows out from the process hose port, and stops the external oil supply device after the hydraulic oil flowing out of the process hose port is free of bubbles; S14, pull the rotor brake control handle to the rear position to move the piston of the isolation pressure transmitter to the right, and then move the safety handle forward to open the oil drain switch; S15, following S14, start the external oil supply equipment and slowly open its pressure supply valve to fill the pipeline with oil. Hydraulic oil with gas should flow out from the process hose port. When the hydraulic oil flowing out of the process hose port is free of bubbles, stop the external oil supply equipment. S16, after 5 to 10 minutes, perform S12 to S15 again, and repeat this rhythm 2 to 3 times; S17, disconnect the quick-release end of the external oil supply device from the fixed end of the self-sealing valve on the rotor; S18, connecting the quick release end and the fixed end of the self-sealing valve on the rotor; S19, pull the safety handle to the rear position to put the oil drain switch in the closed position, pull the rotor brake control handle to the dynamic brake position, check whether the dynamic brake pressure is 3±0.4MPa, put the rotor brake control handle to the static brake position, and check whether the static brake pressure is 7.6±0.7Mpa; S20, when the dynamic brake pressure and the static brake pressure in step S19 meet the requirements in the step, the oil injection and exhaust are completed.

[0009] The external oil supply equipment is a hydraulic hand pump or a hydraulic oil pump truck.

[0010] The dynamic brake position of the rotor brake control handle in the S19 is in the middle position.

[0011] The static brake position of the rotor brake control handle in the S19 is its rear position.

[0012] The rotor brake control handle is connected to the rotor brake valve.

[0013] There are three oil pipelines on the rotor brake valve, one of which is connected to the isolation pressure transmitter, two of which are connected to the external auxiliary system pressure supply, and three of which are connected to the external rotor brake return oil.

[0014] Compared with the prior art, the present invention connects the external oil supply device to the quick-release end and the fixed end of the self-sealing valve respectively, and then pressurizes and injects oil, and cooperates with the opening and closing of the oil drain switch and the movement of the piston in the isolation pressure transmitter to fully release the gas in the pipeline through the bleed valve and the rotor brake small oil tank. Each oil filling and exhaust process fully considers the locations where gas residues may exist in all pipelines, shortens the pipeline distance as much as possible, and exhausts the potential gas accumulation points in the pipeline in a targeted manner, and obtains the internal oil pressure value through dynamic brake and static brake pressure detection for result verification. The whole exhaust method is logically reasonable, does not require too many structural improvements and cumbersome operation steps, and has high practical value for quickly and effectively exhausting the gas generated at various repair scales encountered during the rotor maintenance process, and can be used as a reference in related similar fields, which provides great help for the maintenance quality and efficiency of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The diagram is a pipeline diagram of one of the prior arts in the background art of the present invention.

[0016] Figure 2 This is a pipeline schematic diagram of the second prior art in the background technology of the present invention.

[0017] Figure 3 Schematic diagram of the pipeline of the method of the present invention.

[0018] Figure 4 It is a schematic diagram showing the general assembly of the present invention at the rotor position.

[0019] Figure 5 This is a schematic diagram of the position of the air bleed valve of the rotor brake device of the present invention.

[0020] Description of Reference Numerals 1 is the rotor brake control handle, 2 is the rotor brake valve, 3 is the isolation pressure transmitter, 4 is the rotor brake device, 5 is the oil drain switch, 6 is the self-sealing valve, 7 is the pressure signal device, 8 is the rotor brake small oil tank, 9 is the auxiliary system pressure supply, 10 is the rotor brake oil return, 11 is the air bleed valve, 12 is the oil filling port, 13 is the plugging cap, and 14 is the pipe joint. DETAILED DESCRIPTION

[0021] The present invention will now be further described with reference to the accompanying drawings.

[0022] See also Figures 1 to 5 The present invention provides an oil filling and exhaust method for a brake hydraulic system of a rotor, comprising the following steps: S1, loosen the outer nut of the pipe joint 14 of the pressure supply port of the isolation pressure transmitter 3 by 2 to 3 turns, pull the rotor brake control handle 1 to the rear position, and let the hydraulic oil flow out from the pipe joint 14 until there are no bubbles in the overflowed hydraulic oil, and then tighten the outer nut of the pipe joint 14; S2, turn the rotor brake control handle 1 to the forward position.

[0023] It should be noted here that the rotor brake control handle 1 is in the cockpit and is connected to the rotor brake valve 2 through a steel cable. By controlling the front, rear and middle positions of the rotor brake control handle 1, the rotor brake valve 2 can control the position of the piston inside the isolation pressure transmitter 3.

[0024] S3, disconnect the self-sealing valve 6, and connect the fixed end of the external oil supply equipment pipeline to the quick-release end of the self-sealing valve 6 on the rotor to form an oil filling port 12; S4, loosen the air bleed valve 11 matched with the air bleed valve cap 13 of the rotor brake device 4 by one turn each; S5, start the external oil supply device in step S3, slowly open its pressure supply valve to fill the pipeline with oil, so that the hydraulic oil with gas in the pipeline flows out from the air release valve 11; S6, until there are no bubbles in the hydraulic oil flowing out of the air release valve 11, stop starting the external oil supply device; S7, rest for 5 to 10 minutes, perform S5 to S6 again, and repeat this rhythm 2 to 3 times; S8, disconnect the fixed end of the external oil supply equipment pipeline from the quick-release end of the self-sealing valve 6 on the rotor; S9, replace the fixed end of the external oil supply equipment pipeline with a quick-release end; S10, connecting the quick-release end of the external oil supply equipment pipeline to the fixed end of the self-sealing valve 6 on the rotor; S11, remove the cover of the rotor brake small oil tank 8 and install its process joint, and connect the process hose to the process joint, and connect the other end of the process hose to the oil drain barrel; S12, move the safety handle backward to turn the oil drain switch 5 to the closed position, and turn the rotor brake control handle 1 to the forward position to move the piston of the isolation pressure transmitter 3 to the left; S13, following S12, starts the external oil supply device, slowly opens its pressure supply valve to fill the pipeline with oil, so that the hydraulic oil with gas in the pipeline flows out from the process hose port, and stops the external oil supply device after the hydraulic oil flowing out of the process hose port is free of bubbles; S14, pull the rotor brake control handle 1 to the rear position to move the piston of the isolation pressure transmitter 3 to the right, and then move the safety handle forward to open the oil drain switch 5; S15, following S14, start the external oil supply equipment and slowly open its pressure supply valve to fill the pipeline with oil. Hydraulic oil with gas should flow out from the process hose port. When the hydraulic oil flowing out of the process hose port is free of bubbles, stop the external oil supply equipment. S16, after 5 to 10 minutes, perform S12 to S15 again, and repeat this rhythm 2 to 3 times; S17, disconnecting the quick-release end of the external oil supply device from the fixed end of the self-sealing valve 6 on the rotor; S18, connecting the quick-release end and the fixed end of the self-sealing valve 6 on the rotor; S19, pull the safety handle to the rear position to put the oil drain switch 5 in the closed position, pull the rotor brake control handle 1 to the dynamic brake position, check whether the dynamic brake pressure is 3±0.4MPa, put the rotor brake control handle 1 to the static brake position, and check whether the static brake pressure is 7.6±0.7MPa; S20, when the dynamic brake pressure and the static brake pressure in step S19 meet the requirements in the step, the oil injection and exhaust are completed.

[0025] The external oil supply equipment is a hydraulic hand pump or a hydraulic oil pump truck.

[0026] The dynamic brake position of the rotor brake control handle 1 in S19 is its middle position.

[0027] The static brake position of the rotor brake control handle 1 in S19 is its rear position.

[0028] The rotor brake control handle 1 is connected to the rotor brake valve 2.

[0029] There are three oil pipelines on the rotor brake valve 2, one of which is connected to the isolation pressure transmitter 3, two of which are connected to the external auxiliary system supply pressure 9, and the third of which is connected to the external rotor brake return oil 10.

[0030] The above are only preferred embodiments of the present invention, which are only used to help understand the method and core ideas of the present application. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

[0031] The present invention solves the shortcomings of the prior art in that the gas in the brake oil cannot be quickly and effectively discharged during aircraft rotor maintenance, resulting in a complicated maintenance process and poor quality. The basic method of low-level oil filling and high-level exhaust can completely exhaust the air in the accessories and pipelines of the rotor brake hydraulic system, thereby improving the quality of oil filling and exhaust. The operation is simple, which greatly reduces repetitive work. The total time for oil filling and exhaust of the present invention can be controlled within 1 hour, which is greatly improved compared to the actual average of 3 hours required by the traditional method, thereby reducing the maintenance error rate and improving work efficiency.

Claims

1. A method for oil filling and exhausting of a rotor brake hydraulic system, characterized in that: The following steps are involved: S1, loosen the outer nut of the pipe joint (14) of the pressure supply port of the isolation pressure transmitter (3) by 2 to 3 turns, pull the rotor brake control handle (1) to the rear position, and allow hydraulic oil to flow out from the pipe joint (14) until the hydraulic oil overflows without bubbles, and then tighten the outer nut of the pipe joint (14); S2, turning the rotor brake control handle (1) to the forward position; S3, disconnecting the self-sealing valve (6), connecting the fixed end of the external oil supply equipment pipeline to the quick-release end of the self-sealing valve (6) on the rotor, thereby forming an oil filling port (12); S4, loosen the air bleed valve (11) matched with the air bleed valve plug (13) of the rotor brake device (4) by one turn each; S5, starting the external oil supply device in step S3, slowly opening its pressure supply valve to fill the pipeline with oil, so that the hydraulic oil with gas in the pipeline flows out from the air release valve (11); S6, until there are no bubbles in the hydraulic oil flowing out of the air release valve (11), then stop starting the external oil supply device; S7, after an interval of 5 to 10 minutes, perform S5 to S6 again, and repeat this rhythm 2 to 3 times; S8, disconnecting the fixed end of the pipeline of the external oil supply device from the quick-release end of the self-sealing valve (6) on the rotor; S9, replacing the fixed end of the pipeline of the external oil supply equipment with a quick-release end; S10, connecting the quick-release end of the external oil supply equipment pipeline to the fixed end of the self-sealing valve (6) on the rotor; S11, remove the cover of the rotor brake small oil tank (8) and install its process joint, and connect the process hose to the process joint, and the other end of the process hose is connected to the oil drain bucket; S12, moving the safety handle backward to turn the oil drain switch (5) to the closed position, and turning the rotor brake control handle (1) to the forward position to move the piston of the isolation pressure transmitter (3) to the left; S13, following S12, starting the external oil supply device, slowly opening its pressure supply valve to fill the pipeline with oil, so that the hydraulic oil with gas in the pipeline flows out from the process hose port, until there are no bubbles in the hydraulic oil flowing out of the process hose port, and then stopping the external oil supply device; S14, pulling the rotor brake control handle (1) to the rear position to move the piston of the isolation pressure transmitter (3) to the right, and then moving the safety handle forward to open the oil drain switch (5); S15, following S14, starting the external oil supply device and slowly opening its pressure supply valve to fill the pipeline with oil, hydraulic oil with gas should flow out from the process hose port, until the hydraulic oil flowing out of the process hose port is free of bubbles, and then stopping the external oil supply device; S16, after an interval of 5 to 10 minutes, execute S12 to S15 again, and repeat this rhythm 2 to 3 times; S17, disconnecting the quick-release end of the external oil supply device from the fixed end of the self-sealing valve (6) on the rotor; S18, connecting the quick-release end and the fixed end of the self-sealing valve (6) on the rotor; S19, pull the safety handle to the rear position to place the oil drain switch (5) in the closed position, pull the rotor brake control handle (1) to the dynamic brake position, check whether the dynamic brake pressure is 3±0.4 MPa, put the rotor brake control handle (1) to the static brake position, and check whether the static brake pressure is 7.6±0.7 MPa; S20, when the dynamic brake pressure and the static brake pressure in step S19 meet the requirements in the step, the oil injection and exhaust are completed.

2. The oil filling and exhaust method of the rotor brake hydraulic system according to claim 1, characterized in that: The external oil supply equipment is a hydraulic hand pump or a hydraulic oil pump truck.

3. The oil filling and exhaust method of the rotor brake hydraulic system according to claim 1, characterized in that: The dynamic brake position of the rotor brake control handle (1) in S19 is its middle position.

4. The oil filling and exhaust method of the brake hydraulic system of a rotor according to claim 1, characterized in that: The static brake position of the rotor brake control handle (1) in S19 is its rear position.

5. The oil filling and exhaust method of the brake hydraulic system of a rotor according to claim 1, characterized in that: The rotor brake operating handle (1) is connected to the rotor brake valve (2).

6. The oil filling and exhaust method of the rotor brake hydraulic system according to claim 5, characterized in that: The rotor brake valve (2) has three oil pipelines, one of which is connected to the isolation pressure transmitter (3), two of which are connected to the external auxiliary system pressure supply (9), and three of which are connected to the external rotor brake oil return (10).

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