Device and method for cleaning residual oil inside aircraft fuel pressure signal device

Abstract

The present invention relates to a device and method for cleaning residual oil inside an aircraft fuel pressure signaler, and belongs to the technical field of aviation repair equipment. The cleaning device includes an air intake unit and an air discharge unit, and the air intake unit is connected to the air discharge unit and the signaler through pipelines respectively; the air intake unit is used to fill the signaler with gas with a density lower than that of fuel, and make the air pressure inside the signaler diaphragm box greater than the external air pressure; the air discharge unit is used to discharge the residual oil inside the signaler diaphragm box while discharging the gas inside the signaler diaphragm box; a pressure detection unit is provided in the air intake unit. During inflation, the gas is filled into the signaler diaphragm box through the air inlet of the air intake unit through the inflation device. When the air pressure inside the diaphragm box reaches the set pressure value, the air intake unit is closed and the air discharge unit is opened, so that the pressure inside the signaler diaphragm box is instantly released, and the fuel is taken out together with the gas. The cleaning device uses the pressure difference principle to realize the cleaning of the residual oil inside the signaler.

Description

Technical Field

[0001] The invention relates to a device and method for cleaning residual oil inside an aircraft fuel pressure signal device, belonging to the technical field of aviation repair equipment. Background Art

[0002] The operating medium of an aircraft fuel pressure annunciator (hereinafter referred to as the "annunciator") is fuel. During the entire annunciator repair process, it must be removed from the aircraft and transferred to the repair shop for performance testing. During these tests, the annunciator's operating medium is compressed air. Since some fuel remains inside the annunciator after removal from the aircraft, performance testing often results in the fuel inside the annunciator flowing back into the testing equipment due to pressure differentials. This can contaminate the test equipment and affect the accuracy and precision of the annunciator's performance checks.

[0003] At the same time, there is also the problem that the two media, "fuel" and "compressed air", enter the diaphragm box of the internal component of the signal device at the same time, resulting in uneven deformation of the diaphragm box and deviation in the opening pressure, which affects the performance of the signal device and eventually causes the signal device to be scrapped.

[0004] Therefore, the residual oil remaining inside the signaler will not only contaminate the product performance testing equipment and affect the product performance testing, but also affect the performance of the signaler. At present, no cleaning device for cleaning the residual oil inside the signaler has been found. Summary of the Invention

[0005] In view of this, in order to solve the problem of the inability to clean residual oil inside an aircraft fuel pressure signaler, the purpose of the present invention is to provide a device and method for cleaning residual oil inside an aircraft fuel pressure signaler. The cleaning device uses the pressure differential principle to clean the residual oil inside the signaler, effectively preventing contamination of the test equipment used to test the signaler and improving the accuracy of the signaler performance inspection.

[0006] To achieve the purpose of the present invention, the following technical solutions are provided.

[0007] A device for cleaning residual oil inside an aircraft fuel pressure signaler comprises an air intake unit and an air discharge unit, wherein the air intake unit is connected to the air discharge unit and the signaler via pipelines, respectively. The air intake unit is used to fill the signaler with gas having a density lower than that of fuel and to make the air pressure inside the signaler's diaphragm box greater than the external air pressure. The air discharge unit is used to discharge the residual oil inside the signaler's diaphragm box while discharging the gas inside the diaphragm box.

[0008] The air intake unit is provided with a pressure detection unit for detecting the pressure of the pipeline during the air intake process.

[0009] Furthermore, the air intake unit includes valve A, a one-way valve and valve B; the air inlet is connected to the air inlet end of the one-way valve through a pipeline provided with valve A, the air outlet end of the one-way valve is connected to the air inlet end of valve B through a pipeline provided with a pressure detection unit, and valve B is connected to the connecting nozzles of the air release unit and the air intake unit respectively through pipelines; the connecting nozzle is connected to the receiving nozzle of the signal device.

[0010] Furthermore, the number of the connecting nozzles of the air intake unit is two, and the valve B is connected to the air discharge unit and the two connecting nozzles respectively through a pipeline provided with a four-way connector.

[0011] Furthermore, the pressure detection unit includes a pressure regulator and a pressure gauge, and the air outlet end of the one-way valve is connected to the air inlet end of valve B through a pipeline on which the pressure regulator and the pressure gauge are successively provided; the pressure regulator is matched with the pressure gauge so that the pressure value of the pressure gauge does not exceed its maximum range.

[0012] Furthermore, the degassing unit includes a valve C and a pressure relief pipe, the valve B is connected to the air inlet end of the valve C through a pipeline, and the air outlet end of the valve C is connected to the pressure relief pipe.

[0013] A method for cleaning residual oil inside an aircraft fuel pressure signaler, using the cleaning device of the present invention to clean the residual oil inside the signaler, the method is as follows:

[0014] During inflation, the inflation device is used to fill the gas into the signal diaphragm box through the air inlet of the air inlet unit. When the air pressure inside the diaphragm box reaches the set pressure value, the air inlet unit is closed and the air release unit is opened, so that the pressure inside the signal diaphragm box is instantly released and the fuel is taken out along with the gas.

[0015] The gas has a density less than that of the fuel in the annunciator diaphragm box; the set pressure value is a pressure value at which the internal air pressure of the diaphragm box is greater than the external air pressure, and the pressure value is within the allowable working pressure range of the annunciator diaphragm box.

[0016] When the air intake unit further includes valve A, a one-way valve and valve B, during inflation, valve A and valve B are opened, and the injected gas flows from the air inlet through the pipeline provided with the one-way valve to the connecting nozzle of the air intake unit, and is then injected into the signal device.

[0017] When the pressure detection unit includes a pressure regulator and a pressure gauge, the pressure gauge can display the pressure conditions in the pipeline and the signal device, and the pressure regulator prevents the pressure value of the pressure gauge from exceeding its maximum range.

[0018] When the deflation unit includes valve C and a pressure relief pipe, valve C is closed during inflation; during deflation, valve B is closed and valve C is opened, the pressure inside the signal device is instantly released, and the fuel is brought out along with the gas.

[0019] Furthermore, the method repeats the inflation and deflation cycles more than twice.

[0020] Beneficial effects

[0021] (1) The present invention provides a device for cleaning residual oil inside an aircraft fuel pressure signaler. The device fills the signaler with gas having a density less than that of fuel and releases the gas after reaching a set pressure. The device utilizes the principle of pressure difference to clean the residual oil inside the signaler, effectively preventing the residual oil from contaminating the signaler's detection equipment, improving the accuracy of the signaler's performance inspection, and extending the service life of the signaler.

[0022] (2) The present invention provides a device for cleaning residual oil inside an aircraft fuel pressure signal indicator. The pressure regulator is matched with a pressure gauge to prevent the pressure value of the pressure gauge from exceeding its maximum range, thereby protecting the pressure gauge and the signal indicator.

[0023] (3) The present invention provides a device for cleaning residual oil inside an aircraft fuel pressure signaler. The arrangement of the pressure relief pipe allows the residual oil inside the signaler to be discharged outside the signaler and the cleaning device through the pressure relief pipe.

[0024] (4) The present invention provides a method for cleaning residual oil inside an aircraft fuel pressure signaler. The method uses the pressure difference principle to achieve cleaning of residual oil inside the signaler. The residual oil in the signaler can be cleaned by several times of inflation and deflation, and the method is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the cleaning device of the present invention.

[0026] Figure 2 This is a diagram showing the working principle of the cleaning device of the present invention.

[0027] Among them: 1-air inlet, 2-valve A, 3-check valve, 4-pressure regulator, 5-pressure gauge, 6-valve B, 7-valve C, 8-connecting nozzle, 9-pressure relief pipe. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figure 1 As shown, a device for cleaning residual oil inside an aircraft fuel pressure signal device includes a device housing, an air inlet 1, a valve A2, a one-way valve 3, a pressure regulator 4, a pressure gauge 5, a valve B 6, a valve C7, a connecting nozzle 8 and a pressure relief pipe 9.

[0031] The air inlet 1 is connected to the air inlet end of the one-way valve 3 through a pipeline provided with a valve A2. The air outlet end of the one-way valve 3 is connected to the air inlet end of the valve B6 through a pipeline provided with a pressure regulator 4 and a pressure gauge 5 in sequence. The valve B6 is connected to the air inlet end of the valve C7 and two connecting nozzles 8 through pipelines provided with a four-way joint. The air outlet end of the valve C7 is connected to the pressure relief pipe 9; the two connecting nozzles 8 are respectively connected to the two receiving nozzles of the signal device; the pressure regulator 4 is matched with the pressure gauge 5 so that the pressure value of the pressure gauge 5 does not exceed its maximum range.

[0032] The above is integrated into the device housing, specifically: the top of the outer surface of the device housing is provided with an air inlet 1, valve A2, a pressure gauge 5, valve B 6, valve C 7 and two connecting nozzles 8; the outer side of the device housing is provided with a pressure relief pipe 9; the inside of the device housing is provided with a one-way valve 3 and a pressure regulator 4.

[0033] Example 2

[0034] A method for cleaning residual oil inside an aircraft fuel pressure signaler, using the cleaning device described in Example 1 to clean the residual oil inside the aircraft fuel pressure signaler, the cleaning principle is as follows Figure 2 shown.

[0035] Before using the cleaning device to clean the residual oil in the signal indicator, close valves A2, B6 and C7, connect the high-precision comprehensive tester GCY-1A to the air inlet 1, and fill the signal indicator to be cleaned of residual oil with air (air is a gas with a lower density than fuel. Since the air density is lower than that of fuel, when the air is filled into the signal indicator diaphragm box, the air will be above the fuel); connect the signal indicator to be cleaned of residual oil to the two connecting nozzles 8 of the cleaning device through its own two connecting nozzles.

[0036] During inflation, valves A2 and B6 are opened, while valve C7 remains closed. Air is introduced into the signal device through the high-precision comprehensive tester GCY-1A. The air enters the signal device through valve A2, the one-way valve 3, the pressure regulator 4, and the valve B6 in sequence. The pressure value displayed by the pressure gauge 5 is the pressure in the pipeline and the signal device. As inflation progresses, the pressure value in the pressure gauge 5 gradually increases. The pressure regulator 4 acts as a buffer to prevent the pressure value of the pressure gauge 5 from exceeding its maximum range, thereby protecting the pressure gauge 5 and the signal device. When the pressure value of the pressure gauge 5 reaches 0.13 MPa set in this embodiment, valve B6 is immediately closed and valve C7 is opened to instantly release the pressure inside the signal device. The remaining oil inside the signal device is discharged from the pressure relief pipe 9 as the pressure is released. Repeat the inflation and deflation steps 3 to 4 times to remove most of the remaining oil inside the signal device.

[0037] During the inflation process, when the pressure value of the pressure gauge 5 is higher than the set 0.13MPa, close valve B6 and open valve C7 to release the pressure until the pressure drops below 0.13MPa. Then close valve C7 and open valve B6 to continue inflation until the pressure reaches 0.13MPa. Immediately close valve B6 and open valve C7 to release the pressure. The remaining oil inside the signal device will be discharged from the pressure relief pipe 9 as the pressure is released.

[0038] The present invention includes but is not limited to the above embodiments. Any equivalent replacement or partial improvement made under the spirit and principle of the present invention shall be deemed to be within the protection scope of the present invention.

Claims

1. A method for cleaning residual oil inside an aircraft fuel pressure signal indicator, characterized by: The residual oil cleaning device for the internal part of the aircraft fuel pressure signal is used to clean the residual oil inside the signal. The method is as follows: During inflation, the inflation device is used to fill the gas into the signal diaphragm box through the air inlet of the air inlet unit. When the air pressure inside the diaphragm box reaches the set pressure value, the air inlet unit is closed and the air release unit is opened, so that the pressure inside the signal diaphragm box is instantly released and the fuel is taken out along with the gas. The gas has a density less than that of the fuel in the annunciator capsule; the set pressure value is a pressure value at which the internal air pressure of the capsule is greater than the external air pressure, and the pressure value is within the allowable operating pressure range of the annunciator capsule; The aircraft fuel pressure signal internal residual oil cleaning device includes an air intake unit and an air discharge unit, the air intake unit being connected to the air discharge unit and the signal device through pipelines. The air intake unit is used to fill the signal device with gas with a density less than that of fuel, thereby making the air pressure inside the signal device diaphragm greater than the external air pressure. The air discharge unit is used to discharge the air inside the signal device diaphragm and the residual oil therein at the same time. The air intake unit is provided with a pressure detection unit for detecting the pressure of the pipeline during the air intake process.

2. The method for cleaning residual oil inside an aircraft fuel pressure signal indicator according to claim 1, characterized in that: The air intake unit includes valve A, a one-way valve and valve B; the air inlet is connected to the air inlet end of the one-way valve through a pipeline provided with valve A, the air outlet end of the one-way valve is connected to the air inlet end of valve B through a pipeline provided with a pressure detection unit, and valve B is connected to the connecting nozzles of the air release unit and the air intake unit respectively through pipelines; the connecting nozzle is connected to the receiving nozzle of the signal device.

3. The method for cleaning residual oil inside an aircraft fuel pressure signal indicator according to claim 2, characterized in that: The number of connecting nozzles of the air intake unit is two, and the valve B is connected to the air discharge unit and the two connecting nozzles respectively through pipelines provided with four-way joints.

4. A method for cleaning residual oil inside an aircraft fuel pressure signal device according to claim 2 or 3, characterized in that: The pressure detection unit includes a pressure regulator and a pressure gauge. The outlet end of the one-way valve is connected to the inlet end of valve B through a pipeline successively provided with a pressure regulator and a pressure gauge. The pressure regulator is matched with the pressure gauge so that the pressure value of the pressure gauge does not exceed its maximum range.

5. The method for cleaning residual oil inside an aircraft fuel pressure signal indicator according to claim 4, characterized in that: The degassing unit includes a valve C and a pressure relief pipe. The valve B is connected to the air inlet end of the valve C through a pipeline, and the air outlet end of the valve C is connected to the pressure relief pipe.

6. The method for cleaning residual oil inside an aircraft fuel pressure signal device according to claim 1, characterized in that: The method is repeated for two or more cycles of inflation and deflation.

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