A method for controlling the cleanliness of graphite circumferential seals

Abstract

The present invention relates to a method for controlling the cleanliness of graphite circumferential seals, comprising the following steps: first, immersion cleaning; second, ultrasonic cleaning at a cleaning frequency of 40 kHz and a cleaning time of 300 seconds ± 60 seconds; third, immersion cleaning using a clean hydrocarbon solvent-based cleaning agent; fourth, ultrasonic cleaning using a clean hydrocarbon solvent-based cleaning agent at a cleaning frequency of 40 kHz and a cleaning time of 300 seconds ± 60 seconds; fifth, spray cleaning using a clean hydrocarbon solvent-based cleaning agent for a cleaning time of 60 seconds ± 10 seconds; sixth, steam bath cleaning for a cleaning time of 300 seconds ± 60 seconds; seventh, drying; and eighth, sealing and packaging in dry air. Compared with conventional kerosene or lubricating oil boiling cleaning processes, this method improves the cleanliness control level of graphite circumferential seals.

Description

Technical Field

[0001] The invention relates to the technical field of cleanliness control of graphite circumferential seals of aircraft engines, and in particular to a method for controlling the cleanliness of graphite circumferential seals. Background Art

[0002] Graphite circumferential seals are fragile and easily damaged. They are easily scratched by foreign hard particle contaminants. Graphite is porous and easily absorbs foreign liquids and various contaminants.

[0003] To ensure the cleanliness of graphite circumferential seals, they are often cleaned with kerosene or lubricating oil after processing, heated to a certain temperature, and then boiled and washed. After boiling and washing, they are wrapped in neutral paraffin paper. This cleaning method is ineffective due to the high viscosity of kerosene and lubricating oil, and often requires wiping with a cloth, increasing the uncertainty of manual operation. Furthermore, due to the high viscosity of kerosene and lubricating oil, fine particles of contaminants may remain on the surface of the graphite circumferential seal after cleaning and may be reabsorbed. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a method for controlling the cleanliness of a graphite circumferential seal; the specific technical solution is as follows:

[0005] A method for controlling the cleanliness of a graphite circumferential seal comprises the following steps:

[0006] Step 1: Soak and clean

[0007] Soak the graphite circumferential seal in a hydrocarbon solvent-based cleaning agent for cleaning;

[0008] Step 2: Ultrasonic cleaning

[0009] Ultrasonic cleaning with hydrocarbon solvent-based cleaning agents;

[0010] Step 3: Soak and clean

[0011] Use clean hydrocarbon solvent cleaning agent or distilled and recovered hydrocarbon solvent cleaning agent for soaking and cleaning;

[0012] Step 4: Ultrasonic cleaning

[0013] Use clean hydrocarbon solvent cleaning agent or distilled hydrocarbon solvent cleaning agent for ultrasonic cleaning;

[0014] Step 5: Spray cleaning

[0015] Use clean hydrocarbon solvent type cleaning agent to spray and clean, the cleaning time is 60s±10s;

[0016] Step 6: Steam bath

[0017] Use hydrocarbon solvent type cleaning agent steam bath for 300s±60s;

[0018] Step 6: Drying

[0019] Use hot air drying, the drying temperature is 50℃~60℃.

[0020] Step 7: Dry air sealing packaging

[0021] Place the cleaned graphite circumferential seal in a drying bottle with desiccant.

[0022] The preferred embodiment of the method for controlling the cleanliness of a graphite circumferential seal is as follows: in step 1, the cleaning temperature is room temperature and the cleaning time is 60s±10s.

[0023] The preferred embodiment of the cleanliness control method for a graphite circumferential seal is as follows: in step 2, the cleaning temperature is room temperature, the cleaning frequency is 40 kHz, the cleaning time is 300s±60s, and the solution is released after cleaning.

[0024] The preferred embodiment of the method for controlling the cleanliness of a graphite circumferential seal is that, in step three, the cleaning temperature is room temperature and the cleaning time is 60s±10s.

[0025] The preferred embodiment of the method for controlling the cleanliness of a graphite circumferential seal is as follows: in step 4, the cleaning temperature is room temperature, the cleaning frequency is 40 kHz, the cleaning time is 300s±60s, and the solution is released after cleaning.

[0026] The preferred embodiment of the method for controlling the cleanliness of a graphite circumferential seal is that, in step seven, the cleaned graphite circumferential seal is placed in a polyethylene envelope containing a desiccant.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] The method of the present invention utilizes a hydrocarbon solvent-based cleaning agent for cleaning and a dry air sealing process for packaging, and is suitable for controlling the cleanliness of graphite circumferential seals. Compared to conventional kerosene or lubricating oil boiling cleaning processes, this technology improves the cleanliness control level of graphite circumferential seals. It can replace kerosene or lubricating oil in the cleaning process, improving cleaning effectiveness and resolving the problem of poor drying of the cleaning agent after kerosene or lubricating oil washing, which can easily lead to secondary contamination. DETAILED DESCRIPTION

[0029] Example 1

[0030] The present invention provides a method for controlling the cleanliness of a graphite turnover seal, comprising the following steps:

[0031] Step 1: Soak and clean

[0032] Soak the graphite circumferential seal in a hydrocarbon solvent-based cleaning agent for cleaning at room temperature for 60 seconds.

[0033] Step 2: Ultrasonic cleaning

[0034] Ultrasonic cleaning with hydrocarbon solvent-based cleaning agent, cleaning temperature is room temperature, cleaning frequency is 40kHz, cleaning time is 300s, and the solution is released after cleaning;

[0035] Step 3: Soak and clean

[0036] Use clean hydrocarbon solvent cleaning agent or distilled hydrocarbon solvent cleaning agent to soak and clean. The cleaning temperature is room temperature and the cleaning time is 60s.

[0037] Step 4: Ultrasonic cleaning

[0038] Use clean hydrocarbon solvent cleaning agent or distilled hydrocarbon solvent cleaning agent for ultrasonic cleaning, the cleaning temperature is room temperature, the cleaning frequency is 40kHz, the cleaning time is 300s, and the solution is released after cleaning;

[0039] Step 5: Spray cleaning

[0040] Use clean hydrocarbon solvent type cleaning agent to spray and clean for 60 seconds;

[0041] Step 6: Steam bath

[0042] Use hydrocarbon solvent type cleaning agent steam bath cleaning for 300s;

[0043] Step 6: Drying

[0044] Use hot air drying, the drying temperature is 50℃;

[0045] Step 7: Dry air sealing packaging

[0046] Place the cleaned graphite circumferential seal in a drying bottle with desiccant.

[0047] Example 2

[0048] The present invention provides a method for controlling the cleanliness of a graphite turnover seal, comprising the following steps:

[0049] Step 1: Soak and clean

[0050] Immerse the graphite circumferential seal in a hydrocarbon solvent-based cleaning agent for cleaning at room temperature for 65 seconds.

[0051] Step 2: Ultrasonic cleaning

[0052] Ultrasonic cleaning with hydrocarbon solvent-based cleaning agent, cleaning temperature is room temperature, cleaning frequency is 40kHz, cleaning time is 350s, and the solution is released after cleaning;

[0053] Step 3: Soak and clean

[0054] Use clean hydrocarbon solvent cleaning agent or distilled hydrocarbon solvent cleaning agent for immersion cleaning, the cleaning temperature is room temperature, and the cleaning time is 65 seconds;

[0055] Step 4: Ultrasonic cleaning

[0056] Use clean hydrocarbon solvent cleaning agent or distilled hydrocarbon solvent cleaning agent for ultrasonic cleaning, the cleaning temperature is room temperature, the cleaning frequency is 40kHz, the cleaning time is 350s, and the solution is released after cleaning;

[0057] Step 5: Spray cleaning

[0058] Use clean hydrocarbon solvent cleaning agent or distilled hydrocarbon solvent cleaning agent for spray cleaning, the cleaning time is 65s;

[0059] Step 6: Steam bath

[0060] Use hydrocarbon solvent type cleaning agent steam bath cleaning, time 350s;

[0061] Step 6: Drying

[0062] Use hot air drying, the drying temperature is 60℃;

[0063] Step 7: Dry air sealing packaging

[0064] Place the cleaned graphite circumferential seal in a polyethylene envelope with desiccant.

Claims

1. A method for controlling the cleanliness of a graphite circumferential seal, characterized in that: The steps include: Step 1: Soak and clean Soak the graphite circumferential seal in a hydrocarbon solvent-based cleaning agent for cleaning; Step 2: Ultrasonic cleaning Ultrasonic cleaning with hydrocarbon solvent-based cleaning agents; Step 3: Soak and clean Use clean hydrocarbon solvent cleaning agent or distilled and recovered hydrocarbon solvent cleaning agent for soaking and cleaning; Step 4: Ultrasonic cleaning Use clean hydrocarbon solvent cleaning agent or distilled hydrocarbon solvent cleaning agent for ultrasonic cleaning; Step 5: Spray cleaning Use clean hydrocarbon solvent cleaning agent or distilled hydrocarbon solvent cleaning agent for spray cleaning, the cleaning time is 60s±10s; Step 6: Steam bath Use hydrocarbon solvent type cleaning agent steam bath for 300s±60s; Step 6: Drying Use hot air drying, the drying temperature is 50℃~60℃; Step 7: Dry air sealing packaging Place the cleaned graphite circumferential seal into a drying bottle with desiccant; In step 1, the cleaning temperature is room temperature and the cleaning time is 60s±10s; In step 2, the cleaning temperature is room temperature, the cleaning frequency is 40 kHz, the cleaning time is 300 s ± 60 s, and the solution is released after cleaning; In step 3, the cleaning temperature is room temperature and the cleaning time is 60s±10s.

2. The method for controlling the cleanliness of a graphite circumferential seal according to claim 1, wherein: In step 4, the cleaning temperature is room temperature, the cleaning frequency is 40 kHz, the cleaning time is 300 s ± 60 s, and the solution is released after cleaning.

3. The method for controlling the cleanliness of a graphite circumferential seal according to claim 1, wherein: In step seven, the cleaned graphite circumferential seal is placed in a polyethylene envelope with a desiccant.