An online lubricant paint film treatment device for an oil-injected screw compressor

Abstract

An online lubricant paint film treatment device for an oil-injected screw compressor includes: an intermediate tank with an oil inlet pipe and an oil return pipe; a solenoid valve on the oil inlet pipe; a high-pressure pump on the oil return pipe; a first manual valve on the oil return pipe, located between the high-pressure pump and the intermediate tank; an oil outlet and an oil return port on the side wall of the intermediate tank, with the oil return port below the oil outlet; and an oil film removal and purification machine connected to the oil outlet and the oil return port via pipelines, comprising, in series: an oil filter pump with its inlet connected to the oil outlet; a high-pressure electrostatic filter; an ultrafine filter; an oil sludge removal filter; and a fine filter with its outlet connected to the oil return port. This invention features a novel structure, employing a three-stage filtration system of "ultrafine filter + electrostatic filter + ion exchange resin filter," which can simultaneously remove dissolved paint film (0.01 micrometer level), submicron particles, and acidic substances without damaging lubricant additives (such as antifoaming agents and viscosity index improvers).

Description

Technical Field

[0001] This utility model relates to a processing device, specifically an online processing device for lubricating paint film on an oil-spraying screw compressor. Background Technology

[0002] In chemical processes, screw compressors frequently come into contact with corrosive media containing sulfur, acids, or alkalis, or substances that easily contaminate lubricating oil. These substances enter the lubrication system along with the media, causing the lubricating oil to exceed sulfur content and acid value limits, disrupting oil stability, accelerating oxidation reactions, and ultimately leading to a continuous deterioration of indicators such as flash point and viscosity. This type of problem is prevalent in chemical scenarios involving sulfidation and catalytic reactions. The media react chemically with the lubricating oil, generating acidic substances and polar small-molecule insoluble compounds, which not only reduce lubrication effectiveness but may also corrode metal components, creating a vicious cycle.

[0003] During the operation of an oil-injected screw compressor, the lubricating oil needs to be in full contact with the compressed medium under high temperature (up to 100°C) and high pressure, which easily leads to oxidation and the deposition of polymers. The oil sample test in the document shows a severely high varnish tendency index, indicating that polar substances in the oil adhere to the metal surface to form a varnish film, causing a further increase in the temperature of the friction pair and exacerbating equipment wear. This phenomenon is common in the chemical industry; high temperatures accelerate oil oxidation, generating gums and asphaltenes, while high pressure makes the medium and oil mix more easily, both contributing to a decrease in the lubricating oil's anti-wear performance, reduced cooling efficiency, and even abnormal bearing temperature rise and equipment failure.

[0004] In chemical production, micron-sized contaminants carried by the medium (such as catalyst particles and mechanical impurities) and process residues (such as light diesel oil) can easily mix into the lubricating oil, forming colloids, viscous substances, and metal shavings. Screw compressors often experience problems such as reduced filter replacement frequency and dark-colored replacement oil containing abnormal deposits, reflecting the ineffectiveness of traditional dual-stage filtration systems in retaining complex impurities. This is especially true when contaminants possess both chemical corrosiveness (such as sulfur compounds) and physical abrasiveness (such as metal particles), leading to a sharp increase in filtration load and potential further failure of the filter material due to reaction with contaminants. These problems are particularly prominent in screw compressor applications involving multi-stage process cleaning and catalyst injection.

[0005] In some chemical processes (such as alkaline washing and media washing), if the separation effect is poor, residual wash oil and alkaline solution can easily enter the lubrication system with the media. After mixing with the lubricating oil, they form an inseparable mixture, damaging the oil viscosity and lubrication properties. This leads to poor bearing lubrication and cooling, specifically because the mixture of wash oil and lubricating oil alters the oil film structure, causing overheating of the friction pairs. Furthermore, if the lubrication system of an oil-injected screw compressor is not designed specifically for the process (e.g., lacking online filtration and desulfurization modules), relying solely on periodic oil changes and offline treatment is insufficient to cope with continuous contamination, resulting in a surge in maintenance costs. Utility Model Content

[0006] In view of the above situation and to overcome the defects of the prior art, this utility model provides an online lubricating paint film treatment device for oil-injected screw compressors, which effectively solves the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: This utility model includes:

[0008] The intermediate tank is equipped with an oil inlet pipe and an oil return pipe;

[0009] A solenoid valve is installed on the oil inlet pipe;

[0010] A high-pressure pump is installed on the oil return pipe;

[0011] The first manual valve is located on the return oil pipe and between the high-pressure pump and the intermediate tank;

[0012] The oil outlet and the oil return port are respectively located on the side wall of the intermediate tank, with the oil return port located below the oil outlet;

[0013] The oil film removal and purifying machine connects the oil outlet and oil return port via pipelines, and includes components connected in series:

[0014] Oil filter pump, inlet connected to oil outlet;

[0015] High-voltage electrostatic filter;

[0016] Ultrafine filter;

[0017] Oil sludge filter;

[0018] Fine filter, outlet connected to return oil port;

[0019] The second manual valve is located on the pipeline between the oil outlet and the oil filter pump.

[0020] The third manual valve is located on the pipeline between the oil return port and the fine filter.

[0021] Preferably, the ultrafine filter has a filtration accuracy of 1 μm, and the fine filter has a filtration accuracy of 3 μm.

[0022] Preferably, the first manual valve, the second manual valve, and the third manual valve are all ball valves.

[0023] Preferably, the solenoid valve is linked to the main control system and automatically opens and closes in response to the start / stop signal of the main unit.

[0024] Preferably, the outlet end of the oil removal film cleaning machine is equipped with an online oil cleanliness monitor.

[0025] Preferably, the intermediate tank is equipped with an oil condition observation window.

[0026] Beneficial effects: The installed solenoid valve solves the problem of online oil filtration by ordinary oil filters due to high oil system pressure, and the skid-mounted oil replenishment port solves the problem of difficult online oil replenishment and drainage in high-pressure lubrication systems.

[0027] Anti-backflow design: When the main unit is running, the solenoid valve opens to allow oil to flow in, and when the unit stops, the solenoid valve closes, which can effectively prevent lubricating oil backflow and ensure the stability of the oil circuit system.

[0028] Internal circulation mechanism: The intermediate tank supplies oil to the oil removal film purifier through the oil outlet and receives the purified oil through the oil return port, forming an internal circulation to ensure that the oil is continuously in the purification process.

[0029] Closed-loop system construction: The purified oil flows back to the intermediate tank through the return port after regulation. The high-pressure pump pressurizes the oil and sends it back to the equipment oil circuit, forming a complete closed loop and realizing the efficient recycling of oil.

[0030] Precise graded filtration: High-voltage electrostatic filter: Utilizing the principle of electrostatic adsorption, it can remove tiny charged impurities (such as metal shavings and polar paint film particles).

[0031] Ultrafine filter: It can intercept solid particles, colloids and oxidized polymers in the 1μm range, significantly improving the cleanliness of oil.

[0032] Oil sludge filter: Removes sticky oil sludge contaminants and restores oil fluidity.

[0033] Fine filter: 3μm precision final filtration ensures oil particle size ≤NAS6 level, acid value ≤1.0mgKOH / g, and purification standards meet high industrial precision requirements.

[0034] Targeted purification capability: Three-stage filtration (electrostatic + ultrafiltration + fine filtration) simultaneously removes dissolved paint film (0.01μm level), submicron particles and acidic substances without damaging additives (such as antifoaming agents), maintaining stable oil performance while purifying.

[0035] Online filtration mode: The intermediate tank is directly connected to the equipment oil circuit. The oil is continuously purified through the circulation of "intermediate tank → oil filter pump → four-stage filtration → intermediate tank" without stopping the machine. This allows for oil maintenance without stopping the machine and improves production continuity.

[0036] New oil replenishment mode: Close the first manual valve and turn on the high-pressure pump to directly inject qualified new oil into the system. It is easy to operate, meets the oil replenishment needs, and flexibly adapts to different working conditions.

[0037] Online continuous operation: Adapted to continuous chemical production scenarios, it works in conjunction with the main unit to avoid downtime losses and ensure the efficiency and continuity of industrial production.

[0038] This prevents the condensation of toxic and harmful gases in the intermediate tank, allowing for flare venting. A safety valve is installed after the high-pressure pump; when oil is injected back into the equipment, if the resistance exceeds the system oil pressure, the safety valve activates, causing the oil to flow back into the intermediate tank. Attached Figure Description

[0039] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0040] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0041] The following are labeled in the diagram: 1. Intermediate tank; 2. Solenoid valve; 3. High-pressure pump; 4. First manual valve; 5. Oil removal film purifier; 6. Oil outlet; 7. Oil return port; 8. Second manual valve; 9. Third manual valve; 10. Oil filter pump; 11. High-voltage electrostatic filter; 12. Ultrafine filter; 13. Oil sludge filter; 14. Fine filter. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1 The specific embodiments of this utility model will be described in further detail.

[0043] Example 1, by Figure 1 This utility model provides an online lubricant paint film treatment device for an oil-injected screw compressor, comprising:

[0044] Intermediate tank 1 is equipped with an oil inlet pipe and an oil return pipe;

[0045] Solenoid valve 2 is installed on the oil inlet pipe;

[0046] High-pressure pump 3 is installed on the oil return pipe;

[0047] The first manual valve 4 is located on the oil return pipe and between the high-pressure pump 3 and the intermediate tank 1;

[0048] Oil outlet 6 and oil return outlet 7 are respectively provided on the side wall of intermediate tank 1, and the oil return outlet 7 is located below the oil outlet 6;

[0049] The oil film removal and purification machine 5 is connected to the oil outlet 6 and the oil return port 7 via pipelines, and includes the following components connected in series:

[0050] Oil filter pump 10, with inlet connected to oil outlet 6;

[0051] High-voltage electrostatic filter 11;

[0052] Ultrafine filter 12;

[0053] Oil sludge filter 13;

[0054] Fine filter 14, outlet connected to return oil port 7;

[0055] The second manual valve 8 is located on the pipeline between the oil outlet 6 and the oil filter pump 10;

[0056] The third manual valve 9 is located on the pipeline between the oil return port 7 and the fine filter 14.

[0057] Intermediate Tank 1: As the core component for temporary storage and transfer of lubricating oil, it is equipped with an oil inlet pipe and an oil return pipe to realize the inflow and outflow of lubricating oil. The side wall of the tank is provided with an oil outlet 6 and an oil return port 7, with the oil return port 7 located below the oil outlet 6 to facilitate the circulation of lubricating oil. The tank is also equipped with an oil status observation window, which allows operators to view the internal lubricating oil level, color, impurities, and other conditions in real time. It is also connected to a flare control pipeline.

[0058] Solenoid valve 2: Installed on the oil inlet pipe and linked to the main control system. When the main unit starts, solenoid valve 2 automatically opens, allowing lubricating oil to flow into intermediate tank 1; when the main unit stops running, solenoid valve 2 automatically closes to prevent lubricating oil backflow and ensure system operation safety.

[0059] High-pressure pump 3: Located on the return oil pipe, it provides power for the circulation of lubricating oil and transports the lubricating oil in intermediate tank 1 to the oil removal film purifier 5 for purification.

[0060] First manual valve 4: Located on the return oil pipe, between the high-pressure pump 3 and the intermediate tank 1, it is mainly used to cut off the oil circuit between the intermediate tank 1 and the high-pressure pump 3 during equipment maintenance, repair or debugging, so as to facilitate the operation of related components.

[0061] Oil film removal and purification machine 5: It is the key equipment for realizing the purification of lubricating oil. It is connected to the oil outlet 6 and the oil return port 7 through pipelines. Internally, it consists of an oil filter pump 10, a high-voltage electrostatic filter 11, an ultrafine filter 12, an oil sludge removal filter 13 and a fine filter 14 connected in series.

[0062] Oil filter pump 10: The inlet is connected to the oil outlet 6, which draws out the lubricating oil in the intermediate tank 1 and delivers it to the subsequent filter components.

[0063] High-voltage electrostatic filter 11: Utilizing the principle of high-voltage electrostatics, it effectively adsorbs and removes tiny charged impurities and some oil film particles from lubricating oil.

[0064] Ultrafine filter 12: With a filtration accuracy of up to 1μm, it can intercept finer solid particles, colloids and other impurities, further improving the cleanliness of lubricating oil.

[0065] Oil sludge filter 13: Specifically designed to filter and remove viscous contaminants such as oil sludge formed in lubricating oil, ensuring the fluidity of the lubricating oil.

[0066] Fine filter 14: The filtration accuracy is 3μm. It performs the final fine filtration on the lubricating oil that has been treated before, ensuring that the output lubricating oil meets a high cleanliness standard. Its outlet is connected to the return oil port 7, and the purified lubricating oil flows back to the intermediate tank 1.

[0067] Second manual valve 8: Installed on the pipeline between oil outlet 6 and oil filter pump 10, used to control the flow rate of lubricating oil from intermediate tank 1 into oil removal film purifier 5, and can cut off the oil circuit when necessary.

[0068] The third manual valve 9 is located on the pipeline between the oil return port 7 and the fine filter 14. It is used to regulate the flow rate of the purified lubricating oil returning to the intermediate tank 1. It can also be shut off when needed.

[0069] Online oil cleanliness monitor: Located at the outlet end of the oil removal film purifier 5, it can monitor the cleanliness of the purified lubricating oil in real time and feed the data back to the operator, so as to keep track of the purification effect of the lubricating oil and the operating status of the equipment.

[0070] Working principle: When this utility model is in use, oil inlet and transfer: When the main unit is running, the solenoid valve 2 is opened, and the lubricating oil flows from the equipment oil circuit through the oil inlet pipe into the intermediate tank 1; when the machine is stopped, the solenoid valve is closed to prevent backflow.

[0071] The intermediate tank 1 supplies oil to the oil removal film purification machine 5 through the oil outlet 6, and the oil return port 7 receives the purified oil, forming an internal circulation within the tank.

[0072] Multi-stage filtration and purification: Oil filter pump 10: draws lubricating oil from oil outlet 6, and after the flow rate is adjusted by the second manual valve 8, it is sent into the filtration unit.

[0073] High-voltage electrostatic filter 11: Utilizes the principle of electrostatic adsorption to remove tiny, charged impurities (such as metal shavings and polar paint film particles).

[0074] Ultrafine filter 12: Intercepts 1μm-level solid particles, colloids, and oxidized polymers, improving cleanliness.

[0075] Oil sludge filter 13: Removes sticky oil sludge contaminants and restores oil fluidity.

[0076] Fine filter 14: 3μm precision final filtration ensures oil particle size ≤NAS6 level and acid value ≤1.0mgKOH / g.

[0077] Purified oil return: The purified oil is regulated by the third manual valve 9 and flows back to the intermediate tank 1 from the return port 7; when the liquid level reaches the set value, the high-pressure pump 3 starts and controls the flow rate through the first manual valve 4 to pressurize the oil and send it back to the equipment oil circuit, forming a closed loop.

[0078] Online filtration mode: The intermediate tank is directly connected to the equipment's oil circuit, and the oil is continuously purified through a cycle of "intermediate tank → oil filter pump → four-stage filtration → intermediate tank" without the need to stop the machine.

[0079] Refueling mode

[0080] Close the first manual valve 4, turn on the high-pressure pump 3, and the high-pressure pump 3 directly injects qualified new oil into the system.

[0081] Targeted purification capability: Three-stage filtration (electrostatic + ultrafiltration + fine filtration) simultaneously removes dissolved paint film (0.01μm level), submicron particles and acidic substances without damaging additives (such as antifoaming agents).

[0082] Online continuous operation: Adaptable to continuous chemical production, it operates in conjunction with the main unit to avoid downtime losses. After treatment, the oil film tendency index (MPC△E) is ≤15, meeting ASTM and national standards.

[0083] Beneficial effects: The installation of solenoid valve 2 solves the problem of online oil filtration by ordinary oil filters due to high oil system pressure. In conjunction with the skid oil replenishment port, it solves the problem of difficult online oil replenishment and drainage in high-pressure lubrication systems.

[0084] Anti-backflow design: When the main unit is running, the solenoid valve opens to allow oil to flow in, and when the unit stops, the solenoid valve closes, which can effectively prevent lubricating oil backflow and ensure the stability of the oil circuit system.

[0085] Internal circulation mechanism: The intermediate tank supplies oil to the oil removal film purifier through the oil outlet and receives the purified oil through the oil return port, forming an internal circulation to ensure that the oil is continuously in the purification process.

[0086] Closed-loop system construction: The purified oil flows back to the intermediate tank through the return port after regulation. The high-pressure pump pressurizes the oil and sends it back to the equipment oil circuit, forming a complete closed loop and realizing the efficient recycling of oil.

[0087] Precise graded filtration: High-voltage electrostatic filter: Utilizing the principle of electrostatic adsorption, it can remove tiny charged impurities (such as metal shavings and polar paint film particles).

[0088] Ultrafine filter: It can intercept solid particles, colloids and oxidized polymers in the 1μm range, significantly improving the cleanliness of oil.

[0089] Oil sludge filter: Removes sticky oil sludge contaminants and restores oil fluidity.

[0090] Fine filter: 3μm precision final filtration ensures oil particle size ≤NAS6 level, acid value ≤1.0mgKOH / g, and purification standards meet high industrial precision requirements.

[0091] Targeted purification capability: Three-stage filtration (electrostatic + ultrafiltration + fine filtration) simultaneously removes dissolved paint film (0.01μm level), submicron particles and acidic substances without damaging additives (such as antifoaming agents), maintaining stable oil performance while purifying.

[0092] Online filtration mode: The intermediate tank is directly connected to the equipment oil circuit. The oil is continuously purified through the circulation of "intermediate tank → oil filter pump → four-stage filtration → intermediate tank" without stopping the machine. This allows for oil maintenance without stopping the machine and improves production continuity.

[0093] New oil replenishment mode: Close the first manual valve and turn on the high-pressure pump to directly inject qualified new oil into the system. It is easy to operate, meets the oil replenishment needs, and flexibly adapts to different working conditions.

[0094] Online continuous operation: Adapted to continuous chemical production scenarios, it works in conjunction with the main unit to avoid downtime losses and ensure the efficiency and continuity of industrial production.

[0095] This prevents the condensation of toxic and harmful gases in the intermediate tank, allowing for flare venting. A safety valve is installed after the high-pressure pump; when oil is injected back into the equipment, if the resistance exceeds the system oil pressure, the safety valve activates, causing the oil to flow back into the intermediate tank.

[0096] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An online treatment device for lubricating paint film on an oil-injected screw compressor, characterized in that, include: Intermediate tank (1), which is equipped with an oil inlet pipe and an oil return pipe; Solenoid valve (2) is provided on the oil inlet pipe; A high-pressure pump (3) is installed on the oil return pipe; The first manual valve (4) is located on the return oil pipe and between the high-pressure pump (3) and the intermediate tank (1); The oil outlet (6) and the oil return port (7) are respectively located on the side wall of the intermediate tank (1), and the oil return port (7) is located below the oil outlet (6); The oil film removal and purification machine (5) is connected to the oil outlet (6) and the oil return port (7) via pipelines, and includes the following components connected in series: Oil filter pump (10), with inlet connected to outlet (6); High-voltage electrostatic filter (11); Ultrafine filter (12); Oil sludge filter (13); Fine filter (14), outlet connected to return oil port (7); The second manual valve (8) is located on the pipeline between the oil outlet (6) and the oil filter pump (10); The third manual valve (9) is located on the pipeline between the oil return port (7) and the fine filter (14).

2. The online lubricant paint film treatment device for an oil-injected screw compressor according to claim 1, characterized in that: The ultrafine filter (12) has a filtration accuracy of 1 μm, and the fine filter (14) has a filtration accuracy of 3 μm.

3. The online lubricant paint film treatment device for an oil-injected screw compressor according to claim 1, characterized in that: The first manual valve (4), the second manual valve (8), and the third manual valve (9) are all ball valves.

4. The online lubricating paint film treatment device for an oil-injected screw compressor according to claim 1, characterized in that: The solenoid valve (2) is linked with the host control system and automatically opens and closes in response to the host start / stop signal.

5. The online lubricating paint film treatment device for an oil-injected screw compressor according to claim 1, characterized in that: The oil removal film cleaning machine (5) is equipped with an online oil cleanliness monitor at its outlet end.

6. The online lubricating paint film treatment device for an oil-injected screw compressor according to claim 1, characterized in that: The intermediate tank (1) is equipped with an oil condition observation window.

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