Zero emission aircraft parts washer

Abstract

The utility model discloses a kind of zero-emission aviation parts cleaning machine, it is related to aviation cleaning equipment technical field.It includes liquid path system, electric control cabinet, cleaning tank, online detection module, oil-water separation device, solidification collection module;The online detection module is electrically connected with electric control cabinet, for real-time monitoring the oil content concentration in cleaning fluid, granularity, salinity and feedback to electric control cabinet;The oil-water separation device is connected with cleaning tank by recovery pipeline, for separating oiliness and moisture in waste liquid;The solidification collection module includes the oiliness solidification component connected with the oil-water separation device and with salt solidification component, respectively for solidification collection to the oiliness separated by the oil-water separation device and concentrated salt class.This utility model realizes the zero-emission of cleaning waste liquid, improves water resource utilization rate, and oil salt treatment is convenient, suitable for the environmental protection cleaning of aviation parts.

Description

Technical Field

[0001] This utility model relates to the field of aerospace component cleaning equipment technology, and in particular to a zero-emission aerospace component cleaning machine. Background Technology

[0002] During processing, assembly, and use, aerospace components (such as ducts, engine blades, bearings, and casings) may be contaminated with oil (such as lubricating oil and hydraulic oil), salt (such as salt spray from atmospheric corrosion and inorganic salts in processing coolant), and metal shavings. These impurities can affect the assembly accuracy, operational reliability, and service life of the components, so they must be thoroughly cleaned.

[0003] Currently, specialized cleaning machines are mostly used for cleaning aviation parts. Their basic structure typically includes a cleaning tank, a fluid system (for delivering cleaning fluid), and an electrical control cabinet (for controlling the cleaning process). However, existing cleaning machines have the following significant drawbacks.

[0004] 1. Incomplete wastewater treatment, unable to achieve zero discharge: The wastewater after cleaning contains oily substances, soluble salts and a small amount of solid impurities. Traditional cleaning machines often discharge the wastewater directly or only perform simple filtration before discharge, which not only wastes water resources, but also causes serious pollution to soil and water bodies, which does not meet the development requirements of "green manufacturing" in the aviation industry.

[0005] 2. Low oil-water separation efficiency: Existing oil-water separation devices mostly use ordinary filters or centrifugal separation methods, which have poor interception effect on micron-sized oil droplets, resulting in residual oil substances in the circulating water, affecting the cleaning accuracy; at the same time, the separated oil substances are difficult to collect, which can easily cause secondary pollution.

[0006] 3. Difficulty in handling salts: Salts in waste liquid accumulate continuously during the circulation process. Existing equipment lacks a dedicated salt treatment mechanism. After salt crystallization, it is easy to clog pipelines or adhere to the surface of parts, affecting the life of equipment and cleaning quality. Moreover, the salt collection process is cumbersome and difficult to achieve harmless treatment. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, the present invention aims to provide a cleaning machine that thoroughly treats cleaning waste liquid, including the treatment of oil and salt in the waste liquid, so as to achieve water recycling and zero discharge.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A zero-emission aviation component cleaning machine includes a fluid system, an electrical control cabinet, a cleaning tank, and an online monitoring module; it also includes an oil-water separation device and a solidification and collection module. The online monitoring module is electrically connected to the electrical control cabinet and is used to monitor the oil concentration, particle size, and salinity in the cleaning fluid in real time and feed them back to the electrical control cabinet. The oil-water separation device is connected to the cleaning tank through a recovery pipeline and is used to separate oil and water in the waste fluid. The solidification and collection module includes an oil solidification component and a salt solidification component connected to the oil-water separation device, which are used to solidify and collect the oil and concentrated salt separated by the oil-water separation device, respectively.

[0010] Preferably, the oil-water separation device includes a demulsification pretreatment unit, a filtration membrane unit, a membrane fouling self-cleaning unit, and a distillation separation unit arranged sequentially. The demulsification pretreatment unit breaks down the oil-in-water / water-in-oil structure, improving subsequent separation efficiency. The filtration membrane unit is used to retain oily substances in the waste liquid. The membrane fouling self-cleaning unit is used to degrade oil deposits on the membrane surface, extend membrane life, and reduce maintenance frequency. The distillation separation unit includes a vacuum chamber, a condenser, and a water storage tank. The vacuum chamber maintains a negative pressure environment through a vacuum pump to lower the boiling point of the waste liquid, receives the waste liquid filtered by the filtration membrane unit, and heats the waste liquid through a heating element to evaporate the water into steam. The steam is cooled into liquid water by the condenser and flows into the water storage tank. The outlet of the water storage tank is connected to the liquid circuit system through a pipeline to realize water recycling.

[0011] Preferably, the filter membrane unit uses a modified polyvinyl alcohol-sodium alginate composite membrane with a pore size of 0.1-0.5 μm.

[0012] Preferably, the oil curing component is an oil curing tank, which contains an adsorbent for adsorbing the oily substances trapped by the filter membrane unit.

[0013] Preferably, the salt curing component is a salt curing tank, which is connected to the bottom of the vacuum chamber through a discharge pipe, and includes heating elements embedded in the bottom and side walls and a scraper mechanism located on the bottom plate.

[0014] This utility model has the following advantages compared with the prior art:

[0015] 1. Achieve zero emissions and be environmentally friendly.

[0016] The waste liquid is separated into oil, water and salt by an oil-water separation device. The water is recycled, and the oil and salt are collected and disposed of in a unified manner after solidification. There is no waste liquid discharge, which meets the national environmental protection regulations and the green production standards of the aviation industry.

[0017] 2. Real-time monitoring and precise control

[0018] The online detection module monitors oil concentration, salinity, and particle size in real time. The electrical control cabinet automatically starts the processing flow based on the detection data, avoiding excessive contamination of the cleaning fluid or premature treatment, thereby improving the cleaning effect while reducing energy consumption.

[0019] 3. Highly efficient separation and resource recycling

[0020] Modified polyvinyl alcohol-sodium alginate composite membranes (0.1-0.5μm) exhibit high oil rejection rates, while the distillation separation unit achieves efficient water recovery (water recycling rate ≥90%), significantly saving water resources. Low-temperature distillation technology further reduces energy consumption and offers superior economic benefits.

[0021] 4. Convenient solidification and collection, simple subsequent processing

[0022] Oils are adsorbed and solidified by an adsorbent, while salts are collected by heating, drying, and scraping. The process is stable, and the solidified oils and salts are easy to transport and subsequently recycled (e.g., oils can be used as fuel feedstocks, and salts can be purified and reused), reducing processing costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure;

[0024] Figure 2 This is a workflow diagram.

[0025] In the diagram: 1. Filter membrane unit; 2. Vacuum chamber; 3. Condenser; 4. Water storage tank; 5. Oil curing tank; 6. Salt curing tank; 61. Heating element; 62. Scraper mechanism; 7. Circulation pump; 8. Precision filter; 9. Collection box; 10. Liquid circuit system; 20. Electrical control cabinet; 30. Cleaning tank; 40. Online detection module; 11. Demulsification pretreatment unit; 12. Membrane fouling self-cleaning unit; 12-1. Backwash pipeline; 12-2. Chemical cleaning agent storage tank; 12-3. Wastewater recovery channel. Detailed Implementation

[0026] The structure and principle of this utility model will now be fully explained with reference to specific embodiments, so that those skilled in the art can fully understand and implement it.

[0027] like Figure 1 , Figure 2As shown: The zero-emission aviation component cleaning machine disclosed in this utility model includes a liquid system 10, an electrical control cabinet 20, a cleaning tank 30, an online detection module 40, an oil-water separation device, and a solidification collection module. The online detection module 40 is electrically connected to the electrical control cabinet 20 and is used to monitor the oil concentration, particle size, and salinity in the cleaning fluid in real time and feed them back to the electrical control cabinet 20. The oil-water separation device is connected to the cleaning tank 30 through a recovery pipeline and includes a demulsification pretreatment unit, a filtration membrane unit 1, a membrane fouling self-cleaning unit, and a distillation separation unit arranged sequentially. Wherein:

[0028] The demulsification pretreatment unit 11 disrupts the oil-in-water / water-in-oil structure, improving subsequent separation efficiency. This can be achieved by one or more combinations of ultrasonic oscillation demulsification, chemical demulsifier addition, or high-voltage electric field demulsification. In this embodiment, the demulsification pretreatment unit 11 uses a high-frequency ultrasonic generator (frequency 20kHz-40kHz, power density 0.3W / cm³-0.8W / cm³) to act on the waste liquid channel, disrupting the oil-water emulsion structure.

[0029] The filter membrane unit 1 is used to remove oily substances from the waste liquid.

[0030] The membrane fouling self-cleaning unit 12 is used to degrade oil stains on the membrane surface, extend membrane life, and reduce maintenance frequency. It can be implemented by one or more combinations of backwashing pipelines, chemical cleaning agent injection, or mechanical scraping devices. In this embodiment, a closed-loop circulation cleaning design is adopted, including a backwashing pipeline 12-1, a chemical cleaning agent storage tank 12-2, and a waste liquid recovery channel 12-3. Backwashing pipeline 12-1: Purified water in the storage tank 4 is injected back into the filter membrane unit 1 through a high-pressure water pump, and the reverse water flow is used to remove oil stains from the membrane surface. Chemical cleaning agent storage tank 12-2: Alkaline cleaning agent (such as 0.5%-2.0% NaOH solution) or surfactant solution is stored and injected into the backwash water flow through a metering pump to dissolve stubborn oil stains. Waste liquid recovery channel 12-3: The wastewater after cleaning is returned to the inlet of the demulsification pretreatment unit 11 through an independent pipeline to avoid contaminating the subsequent distillation unit. The workflow includes: S1. Triggering: The connection between the backwash pipeline 12-1 and the filter membrane unit 1 uses a two-way sealing quick connector. During flushing, the membrane unit outlet valve (shown as f) is automatically locked, forming a closed cavity. During operation, the self-cleaning program is started by the running time (every 24 hours) of the electrical control cabinet 20; S2. Backwashing: The membrane unit outlet valve (f) is closed, forming a closed cavity. The high-pressure water pump is turned on, and purified water from the water storage tank 4 is injected back into the filter membrane unit 1 at a preset pressure (e.g., 0.5-1.0 MPa) for 60-120 seconds; S3. Cleaning: 1.5% NaOH solution (flow ratio 1:20) is injected into the backwash water flow, and the system is circulated and flushed for 5 minutes; S4. Recovery: The wastewater after cleaning is discharged into the inlet pipe of the demulsification pretreatment unit 11 through a dedicated drain valve, mixed with the newly added waste liquid, and then reprocessed (or introduced into the waste liquid collection tank for periodic disposal); S5. Resetting: The outlet valve (f) of the filter membrane unit 1 is opened, and the normal separation process is restored.

[0031] The distillation separation unit is used to separate water and achieve water recycling.

[0032] The solidification and collection module includes an oil solidification component connected to the filtration membrane unit and a salt solidification component connected to the distillation separation unit, which are used to solidify and collect the retained oil and the distillation residue salts, respectively.

[0033] Further configuration: The distillation separation unit includes a vacuum chamber 2 (made of corrosion-resistant stainless steel, with a vacuum level maintained by a connected vacuum pump), a condenser tube 3, and a water storage tank 4. The vacuum chamber 2 receives the waste liquid filtered by the filter membrane unit 1, and heats the waste liquid through an electric heating tube, causing the water to evaporate into steam. The steam is cooled into liquid water by the condenser tube 3 and flows into the water storage tank 4. The outlet of the water storage tank 4 is connected to the inlet of the liquid circuit system 10 to achieve water recycling. In this embodiment, the electric heating tube in the vacuum chamber 2 adopts infrared heating technology, with a heat conversion efficiency of 90%, which is 20% higher than that of traditional resistance heating tubes. It can quickly heat the waste liquid to the boiling point and reduce energy consumption by nearly 15%. The condenser tube 3 adopts a spiral structure, which increases the condensation area by 50% compared to the straight tube type, and the steam condensation rate reaches more than 98%, ensuring efficient water recovery and reducing steam waste.

[0034] Further details: The filter membrane unit 1 uses a modified polyvinyl alcohol-sodium alginate composite membrane with a pore size of 0.1-0.5 μm. This composite membrane undergoes cross-linking modification, resulting in a surface with hydrophilic groups. It achieves a rejection rate of over 95% for oil droplets larger than 0.1 μm, and is resistant to acid and alkali corrosion (operating stably within a pH range of 3-11). It exhibits strong anti-fouling capabilities, extends the cleaning cycle to 7 days, and extends its service life by more than 30% compared to ordinary polytetrafluoroethylene filter membranes.

[0035] Further configuration: The oil curing component is an oil curing tank 5, which contains an adsorbent (in this embodiment, modified activated carbon adsorbent is used to improve the adsorption effect for oily substances with specific polar groups and high viscosity, such as synthetic ester lubricating oil and phosphate ester hydraulic oil, commonly found in aviation component cleaning wastewater), used to adsorb oily substances retained by the filter membrane unit 1; the salt curing component is a salt curing tank 6, connected to the bottom of the vacuum chamber 2 through a discharge pipe, including heating plates 61 embedded in the bottom and side walls and a scraper mechanism 62 located on the bottom plate. Specifically: the heating plates 61 are made of graphene, with a heating uniformity error ≤2℃, and a 25% increase in salt drying efficiency at 70℃, resulting in a salt moisture content ≤1% after drying; the scraper mechanism 62 uses a food-grade silicone scraper with a 99% fit to the tank body, activated every 2 hours, and can scrape 99.5% of the dried salt into the collection box, preventing salt residue from clogging the pipeline.

[0036] The cleaning process in this embodiment is as follows:

[0037] 1. Cleaning stage: Place the parts to be cleaned in the cleaning tank 30 (secured by the device), and the electrical control cabinet 20 controls the start of the liquid system 10. The cleaning fluid is used to perform high-pressure cleaning on the parts through the conduit / nozzle.

[0038] 2. Detection stage: The cleaning fluid in the cleaning tank 30 is detected in real time by the oil content sensor, particle size sensor and salinity sensor of the online detection module 40, and the data is transmitted to the electrical control cabinet 20;

[0039] 3. Separation Stage: When the oil concentration, particle size, or salinity exceeds the preset threshold, the electrical control cabinet 20 controls the valve of the recovery pipeline to open, and the waste liquid enters the oil-water separation device.

[0040] First, it flows through the demulsification pretreatment unit 11, where the emulsion structure is destroyed under the action of ultrasound;

[0041] Then, after passing through the filter membrane unit 1, the oily substances are intercepted by the 0.3μm composite membrane and enter the oil solidification tank 5 through the oil drain pipe, where they are adsorbed by the modified activated carbon.

[0042] The filtered waste liquid (containing water and salts) enters the vacuum chamber 2, which is maintained under negative pressure by a vacuum pump. The water is heated by an electric heating tube, evaporates into steam, and is cooled into liquid water by a condenser tube 3, flowing into a water storage tank 4. A water level sensor is installed in the water storage tank 4. When the water level is lower than the threshold, the water replenishment program is automatically triggered to ensure a stable water supply to the liquid circuit system 10. During the flow of waste liquid in this step, the membrane fouling self-cleaning unit 12 is in standby mode. Backwashing and chemical cleaning are only triggered during the maintenance cycle.

[0043] (Membrane maintenance stage: Based on the running time or the pressure difference signal before and after the membrane, the electrical control cabinet 20 periodically or when necessary starts the membrane fouling self-cleaning unit 12 to perform backwashing and chemical cleaning procedures. The cleaning waste liquid is discharged into the waste liquid collection or returned to the inlet of the demulsification pretreatment unit.)

[0044] 4. Solidification and collection stage: Modified activated carbon in oil solidification tank 5 continuously adsorbs oil. After adsorption saturation, the adsorbent is replaced. Salts deposited at the bottom of vacuum chamber 2 enter salt solidification tank 6. Heating plate 61 heats to 70°C to dry the salts. Scraper mechanism 62 is activated every 2 hours to scrape the dried salts into collection box 9.

[0045] 5. Circulation stage: The purified water in the water storage tank 4 is transported to the liquid circuit system 10 by the circulation pump 7 and reused for cleaning to achieve water circulation; a precision filter 8 (filtration accuracy 0.2μm) is installed at the outlet of the water storage tank 4 to further remove trace impurities in the water and ensure the cleanliness of the circulating water; the water circulation utilization rate is stable at more than 92%, saving more than 60% of water compared with traditional cleaning machines, thus achieving water circulation.

[0046] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the technical principles and scope of this utility model. Therefore, any combination, modification, or substitution made to the disclosed technical features of this utility model based on its technical essence, without departing from the principles or solution of this utility model, should fall within the protection scope of this utility model.

Claims

1. A zero-emission aircraft parts cleaning machine, comprising a liquid circuit system (10), an electric control cabinet (20), a cleaning tank (30), an online detection module (40); characterized in that, It also includes an oil-water separation device and a solidification collection module; the online detection module (40) is electrically connected to the electrical control cabinet (20) and is used to monitor the oil concentration, particle size and salinity in the cleaning liquid in real time and feed them back to the electrical control cabinet (20); the oil-water separation device is connected to the cleaning tank (30) through a recovery pipeline and is used to separate oil and water in the waste liquid; the solidification collection module includes an oil solidification component and a salt solidification component connected to the oil-water separation device, which are used to solidify and collect the oil and concentrated salt separated by the oil-water separation device, respectively.

2. The zero-emission aviation component cleaning machine as described in claim 1, characterized in that, The oil-water separation device includes a demulsification pretreatment unit (11), a filtration membrane unit (1), a membrane fouling self-cleaning unit (12), and a distillation separation unit arranged in sequence. The demulsification pretreatment unit (11) breaks the oil-in-water / water-in-oil structure and improves the efficiency of subsequent separation. The filtration membrane unit (1) is used to intercept oily substances in the waste liquid. The membrane fouling self-cleaning unit (12) is used to degrade oil stains on the membrane surface, extend the membrane life, and reduce the frequency of maintenance. The distillation separation unit includes a vacuum chamber (2), a condenser (3), and a water storage tank (4). The vacuum chamber (2) maintains a negative pressure environment through a vacuum pump to reduce the boiling point of the waste liquid, receives the waste liquid filtered by the filtration membrane unit (1), heats the waste liquid through a heating element to evaporate the water into steam, and the steam is cooled into liquid water through the condenser (3) and flows into the water storage tank (4). The outlet of the water storage tank (4) is connected to the liquid circuit system (10) through a pipeline to realize the recycling of water.

3. The zero-release aircraft part washer of claim 2, wherein, The filter membrane unit (1) uses a modified polyvinyl alcohol-sodium alginate composite membrane with a pore size of 0.1-0.5 μm.

4. The zero-release aircraft part washer of claim 2 or 3, wherein, The oil curing component is an oil curing tank (5) with an adsorbent inside, used to adsorb the oil substances trapped by the filter membrane unit (1).

5. The zero-release aircraft part washer of claim 2, wherein, The salt curing component is a salt curing tank (6), which is connected to the bottom of the vacuum chamber (2) through a discharge pipe. It includes heating elements (61) embedded in the bottom and side walls and a scraper mechanism (62) located on the bottom plate.

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