Multifunctional high-pressure air filter

Abstract

The utility model discloses a multifunctional high-pressure air filter, relates to the technical field of air purification equipment, and is particularly suitable for gas filtration treatment in a high-pressure environment of 20MPa and above. The filter comprises an upper shell, a lower shell, a filter element, an anti-entrainment plate, a liquid collecting cavity and a liquid discharging assembly, and the filter element is of a three-layer stainless steel composite structure and has the advantages of being high in strength and filtering precision and capable of being repeatedly cleaned and used; a plurality of directional inclined holes are formed in the anti-entrainment plate, so that oil-water particles can be effectively prevented from rolling back, and the separation efficiency is improved; the liquid discharging structure adopts a rotary joint capable of rotating by 360 degrees and an elastic clamping ring for limiting, so that the liquid discharging structure adapts to different mounting directions; meanwhile, a high-pressure differential pressure gauge is arranged, so that online monitoring of the running state of the filter element is facilitated. The filter is compact in structure, reliable in sealing, high in filtering efficiency and flexible to mount, and has a good industrial application prospect.

Description

Technical Field

[0001] This utility model relates to the field of air filtration technology, specifically a multifunctional high-pressure air filter. Background Technology

[0002] Compressed air filters are widely used in compressed air power systems in industrial enterprises and research institutions. They are mature standard products, and current technology is mainly suitable for low- to medium-pressure applications, with operating pressures typically not exceeding 1.6 MPa. These filters typically include an upper housing, a lower housing, a filter element, a sealing ring, and a drain valve. The drain valve is often connected to the lower housing via a right-angle connector or a threaded connection, or it may employ a plugging or automatic draining method. Filter elements are categorized into particulate filters and oil filters based on their function. Particulate filters remove solid particulate impurities from compressed air, while oil filters primarily separate liquid oil and water through coalescence.

[0003] While existing compressed air filters offer some performance benefits, they still suffer from numerous technical limitations. Firstly, current products generally fail to meet the structural strength and sealing reliability requirements under high-pressure conditions (e.g., 20 MPa and above), hindering stable operation in high-pressure systems. Secondly, filter elements are mostly made of disposable materials such as glass fiber, making them non-reusable and resulting in high maintenance costs. Furthermore, the fixed direction of traditional drainage structures restricts installation due to limited space, making operation inconvenient. Most existing filters lack online differential pressure displays, making it difficult to promptly assess filter element clogging levels and lacking an effective maintenance early warning mechanism. Simultaneously, under high flow rates, oil and water accumulating on the filter element surface are easily entrained by airflow, leading to backflow and reduced separation efficiency, thus affecting downstream gas quality.

[0004] Therefore, there is an urgent need for a high-performance compressed air filter that is suitable for high-pressure conditions, has a compact structure, reusable filter elements, flexible installation methods, and online differential pressure display function, in order to overcome the shortcomings of existing technologies and improve the safety, reliability and economy of the system. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the existing defects and provide a multifunctional high-pressure air filter. This filter optimizes the separation path of airflow and oil-water particles, avoids backflow, improves gas purification effect, and the drain port structure supports installation in any direction of 360 degrees to adapt to complex on-site layout requirements. It adopts a full stainless steel filter element structure, can be washed and reused, and is suitable for high-pressure working conditions of 20MPa and above. It can effectively solve the problems in the background technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A multifunctional high-pressure air filter, comprising an upper housing, a lower housing, a drain valve, and a filter element. An anti-entrapment plate is installed inside the lower housing. The lower end of the filter element is threadedly connected to the anti-entrapment plate, and the upper end of the filter element abuts against the upper housing. The anti-entrapment plate has circumferential anti-entrapment oblique holes. The lower cavity of the anti-entrapment plate is configured as a liquid collection chamber for collecting solid particulate impurities, liquid oil, and water. The upper housing and lower housing are threadedly connected. An outlet connector is installed on the left side of the upper housing, and an inlet connector is installed on the right side. Gas enters the lower housing through the inlet connector. Gas flows from the outside of the filter element into the lower housing. The filtered clean gas flows upward and exits through the outlet connector of the lower housing. During this process, solid particulate impurities, liquid oil, and water are removed. Blocked on the outer surface of the filter element, liquid oil and water, due to their high density and fluidity, will naturally settle and accumulate, gathering in the collection chamber of the lower housing. They are periodically discharged through a drain valve, which is connected to the drain port of the lower housing via a rotary joint. A retaining ring mounting hole is provided at the drain port, and a second sealing ring is installed between the rotary joint and the drain port. The second sealing ring ensures the safety of the sealed connection at the rotary joint, and an elastic retaining ring passes through the retaining ring mounting hole, locking into the elastic retaining ring mounting groove of the rotary joint. The elastic retaining ring is U-shaped. The installation of this rotary joint is simple, achieved using an elastic retaining ring, improving installation efficiency. The elastic retaining ring is limited by the retaining ring mounting hole in the lower housing, preventing the rotary joint from dislodging downwards along the rotation axis. A drain port connector is connected to the outlet of the drain valve.

[0007] The installed rotary joint, along with the drain valve and drain port connector, can rotate 360 ​​degrees along the axis of rotation. In this way, the drain port connector can achieve 360-degree omnidirectional connection when installed externally, without being limited by installation space and orientation.

[0008] Furthermore, the upper housing is fitted onto the lower housing and connected by threads. A sealing ring is provided between the upper and lower housings to ensure the overall sealing of the filter housing and prevent leakage. A mounting bracket is provided on one side of the upper end of the upper housing, and a high-pressure differential pressure gauge is provided on the side of the mounting bracket. The high-pressure differential pressure gauge is connected to the high-pressure side of the filter through a high-pressure end connector, and the high-pressure differential pressure gauge is connected to the low-pressure side of the filter through a low-pressure end connector.

[0009] Furthermore, the drain port of the lower housing is provided with a sealing surface one and a fixing surface one, and the rotary joint is provided with a sealing surface two and a fixing surface two. The sealing surface two is provided with a sealing ring two mounting groove, and the sealing ring two is set in the sealing ring two mounting groove. The elastic retaining ring mounting groove is set on the fixing surface two. The sealing surface two and the fixing surface two are respectively installed in conjunction with the sealing surface one and the fixing surface one of the lower housing.

[0010] Furthermore, the U-shaped opening of the elastic retaining ring is provided with lead-sealed holes at both ends. After the elastic retaining ring is installed in place, it is sealed with anti-loosening lead using stainless steel wire to prevent it from coming out of the retaining ring mounting hole of the filter and to ensure structural safety.

[0011] Furthermore, the filter element consists of a sealing ring three, an upper end cap, filter layer one, filter layer two, filter layer three, and a lower end cap, all assembled together by welding. Filter layer one is made of stainless steel sintered mesh plate rolled and welded into a cylindrical shape, offering advantages such as good air permeability, high strength, and resistance to deformation under pressure. Filter layer two is made of stainless steel powder sintered tube, providing high filtration accuracy and uniform pore distribution, suitable for separating various solid particulate impurities and liquid particulate matter in compressed gas. Sintering filter layer two and filter layer one together under vacuum and high temperature conditions ensures both filtration accuracy and efficiency. This also ensures the strength of the filter layer. The third filter layer is a strong hydrophobic layer formed by Teflon spraying on the surface of the second filter layer. The thickness of the sprayed strong hydrophobic layer is 25um to 60um. The surface of the powder sintered layer with the sprayed strong hydrophobic layer is oleophilic but does not adhere to oil. Oil particles attached to it can easily slide off and be washed away. At the same time, there will be no large area of ​​oil film "bridging" between the pores of the powder sintered layer, and the pores of the sintered layer will not be blocked. The third sealing ring is set between the upper end cover and the upper shell to ensure the sealing of the high-pressure side and the low-pressure side and prevent gas leakage.

[0012] The filter element designed and manufactured according to this structural scheme is made entirely of stainless steel. After the filter element becomes clogged for a period of time, it can be removed and reused after being cleaned by ultrasonic cleaning or other methods, which saves the overall use and maintenance cost of the filter.

[0013] The filter element designed and manufactured according to this structural scheme was installed inside the housing and tested on a special test bench for oil mist separation efficiency. The test results showed that its oil mist filtration efficiency was above 99.9%.

[0014] Furthermore, an anti-entrapment plate is installed on the top of the liquid collection chamber. The anti-entrapment oblique hole has a fixed tilt angle, forming a blade similar to a fixed tilt angle. Fixed gaps are evenly distributed between the blades. This structural design allows the accumulated liquid particles to settle downwards and collect by gravity, preventing the liquid particle mist in the liquid collection chamber from flowing upwards due to the eddy effect. It can effectively prevent the oil-water mixture collected in the liquid collection chamber from being drawn into the airflow and passing through the filter element into the downstream during high-speed gas flow, causing the exhaust gas indicators to exceed the standard.

[0015] The lower end cover has an anti-clamping plate fixing rod in the center, and the anti-clamping plate has a fixing hole in the center. The anti-clamping plate fixing rod passes through the fixing hole and is fixed by a nut, which facilitates filter element installation and ensures the stability of the installation structure.

[0016] This solution addresses the drawbacks of traditional compressed air filter oil removal filter elements, which use disposable consumables such as glass fiber. The designed stainless steel composite filter element can be cleaned and reused, saving on filter usage and maintenance costs. It is equipped with a high-pressure differential pressure gauge, solving the problem of on-site display of high-pressure air filter readings. The specially designed rotary joint and corresponding sealing and installation fixing structure allow for on-site installation of the filter drain port at any angle of 360 degrees, making installation convenient and simple.

[0017] The working pressure is not less than 20MPa, the gas flow rate is 0.36m3 / min, and a high pressure differential gauge is installed. It adopts a top fixed frame for fixing and the inlet and outlet adopt a threaded connection. In actual implementation, other fixed structure forms and external dimensions of high pressure air filters can be designed according to the size of the gas flow rate.

[0018] The filter element is sealed to the lower housing by a sealing ring three. The bottom is positioned against the inner wall of the lower housing by an anti-clamping plate. In actual implementation, other sealing forms and sizes of filter elements can be designed according to the flow rate of the gas being processed and the structural design of the filter housing.

[0019] In actual implementation, rotary joints and flexible retaining rings can be designed in other sizes and specifications based on the combined design of the filter housing structure.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. This utility model addresses the needs of high-pressure compressed air systems by employing high-strength metal materials in its overall design, enabling the entire unit to withstand pressures of 20MPa and above. A triple-seal positioning system with sealing rings between the filter element and the housing prevents high-pressure gas leakage, achieving strict control over the entire process from gas entering through the inlet, flowing into the filter element from the outside, and exiting through the outlet. This effectively ensures the long-term stable operation of the filter in high-pressure environments. Compared to existing medium- and low-pressure filtration products, this utility model significantly improves the operating pressure rating and environmental adaptability, expanding the product's industrial application range.

[0022] 2. This utility model effectively weakens the eddy current effect caused by high-speed gas disturbance by setting an anti-entrapment plate under the filter element and using anti-entrapment oblique holes with a fixed tilt angle; the liquid oil and water collected in the liquid collection chamber can settle naturally and will not be carried back into the outlet gas by the airflow. This structural design breaks the problem that the oil and water backflow in traditional filters can easily cause the oil content of the output gas to exceed the standard.

[0023] 3. The filter element of this utility model adopts a three-layer structure, which has both high mechanical strength and excellent filtration efficiency and oleophobic properties. Among them, the strong oleophobic layer of the third filter layer maintains high oil mist separation efficiency while avoiding oil film bridging and clogging, so that the filter element maintains long-term stable performance during oil-water separation. The filter element structure can be cleaned and restored to its performance by ultrasonic or high-pressure gas after clogging, and can be reused, avoiding the waste of consumables caused by disposable filter materials such as glass fiber.

[0024] 4. The rotary joint structure utilizes a U-shaped elastic retaining ring to cooperate with the limiting hole of the lower housing to achieve quick installation and disassembly. The rotary joint can achieve 360-degree rotation connection, so that the drainage direction is not limited by the installation space, which greatly improves the installation flexibility. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the formal structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the left-side structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0028] Figure 4 This is a schematic diagram of the filter element structure of this utility model;

[0029] Figure 5 This is a schematic diagram of the anti-pinch plate structure of this utility model;

[0030] Figure 6 This is a schematic diagram of the lower shell structure of this utility model;

[0031] Figure 7 This is a schematic diagram of the elastic retaining ring structure of this utility model;

[0032] Figure 8 This is a schematic diagram of the rotary joint structure of this utility model.

[0033] In the diagram: 1 Low-pressure end connector, 2 High-pressure end connector, 3 High-pressure differential pressure gauge, 4 Inlet connector, 5 Upper housing, 6 Lower housing, 7 Drain valve, 8 Drain port connector, 9 Rotary joint, 10 Outlet connector, 11 Mounting bracket, 12 Sealing ring I, 13 Filter element, 14 Anti-clamping plate, 15 Sealing ring II, 16 Elastic retaining ring, 17 Sealing ring III, 18 Upper end cover, 19 Filter layer I, 20 Filter layer II, 21 Filter layer III, 22 Lower end cover, 23 Anti-clamping plate fixing rod, 24 Fixing hole, 25 Anti-clamping oblique hole, 26 Retaining ring mounting hole, 27 Liquid collection chamber, 28 Drain port, 29 Elastic retaining ring mounting groove, 30 Sealing surface I, 31 Fixing surface I, 32 Fixing surface II, 33 Sealing surface II, 34 Sealing ring II mounting groove, 35 Lead seal hole. Detailed Implementation

[0034] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Please see Figure 1-8 This utility model provides a technical solution: a multifunctional high-pressure air filter, wherein an anti-entrapment plate 14 is provided inside the lower housing 6, the lower end of the filter element 13 is connected to the anti-entrapment plate 14 by a thread, and the upper end abuts against the upper housing 5; the anti-entrapment plate 14 is provided with a plurality of anti-entrapment inclined holes 25 with fixed inclination angles along the circumferential direction, and a liquid collection chamber 27 is provided below it to collect solid particulate impurities and liquid oil-water mixtures separated from the air; the upper housing 5 and the lower housing 6 are connected by a thread, and the filter element 13 is connected by a thread at the connection position. The sealing ring 12 ensures the airtightness of the housing; gas enters the interior of the lower housing 6 through the inlet connector 4 on the upper housing 5, flows into the interior from the outside of the filter element 13, and is discharged from the outlet connector 10 after completing the filtration process; the drain valve 7 is connected to the drain port 28 through the rotary connector 9, and the rotary connector 9 is equipped with a sealing ring 15 to ensure airtightness; the drain port 28 is provided with a retaining ring mounting hole 26, which is installed and limited by the U-shaped elastic retaining ring 16 to prevent the rotary connector 9 from coming off; the outlet end of the drain valve 7 is connected to the drain port connector 8.

[0036] The filter element 13 is placed between the upper housing 5 and the lower housing 6, and multi-stage filtration of high-pressure compressed gas is achieved through the filter element 13. External gas enters the lower housing 6 through the inlet connector 4, and enters the interior of the filter element after passing around the outer surface of the filter element 13, completing the separation of solid impurities and liquid oil and water. Due to their high density, the separated oil and water particles settle into the liquid collection chamber 27 by gravity. The inclined anti-entrapment holes 25 arranged on the anti-entrapment plate 14 play a role in mitigating the eddies caused by high-speed airflow, effectively preventing the liquid oil and water deposited in the liquid collection chamber 27 from being carried back into the airflow and contaminating the output gas. The drainage system adopts the structure of rotary joint 9 + drainage valve 7, which can achieve 360-degree rotation and adapt to various installation conditions. At the same time, the elastic retaining ring 16 provides convenient and reliable locking and limiting functions.

[0037] This embodiment improves the structural stability and sealing reliability of the high-pressure air filter under high pressure conditions above 20MPa. The stainless steel material and threaded connection ensure pressure resistance. The anti-entrapment plate 14 and its inclined hole structure effectively prevent oil and water reverse entrainment and improve the filtration effect. The liquid collection chamber (27) structure facilitates the collection of separated materials and subsequent discharge, enhancing the convenience of maintenance. The 360-degree rotation function of the drainage system significantly improves the adaptability of on-site installation, simplifies the operation process, and reduces labor costs. In addition, the use of U-shaped elastic retaining rings in conjunction with the limit hole design provides an efficient and quick installation method and has excellent anti-detachment structure protection.

[0038] In specific applications, the connection between filter element 13 and anti-clamping plate 14 can be replaced by other methods such as buckles or clamping nuts to adapt to different usage requirements; the angle and number of anti-clamping oblique holes 25 can also be adjusted and optimized according to airflow speed and oil mist concentration; the liquid collection chamber 27 can be adjusted in volume according to gas moisture content and usage frequency or equipped with a liquid level sensor to achieve automatic liquid drainage; the rotary joint 9 can be replaced with a quick-release clamp structure to adapt to different industrial installation environments; the elastic retaining ring 16 can be an open C-shape or a closed ring in addition to the U-shaped structure, and the selected material can be replaced from spring steel, stainless steel, titanium alloy, etc. to enhance adaptability and corrosion resistance.

[0039] In one possible implementation, the upper housing 5 is fitted onto the lower housing 6, and the two are connected by threads. A sealing ring 12 is provided at the threaded connection to ensure the overall sealing of the filter housing under high pressure and prevent gas leakage. A mounting bracket 11 is provided on one side of the upper end of the upper housing 5. The mounting bracket is used to fix the high pressure differential gauge 3. The high pressure end of the high pressure differential gauge 3 is connected to the high pressure side of the filter through the high pressure end connector 2, and the low pressure end is connected to the low pressure side through the low pressure end connector 1 to realize real-time monitoring of pressure differential changes.

[0040] This structural design, by installing a mounting bracket 11 and a high-pressure differential pressure gauge 3 on the upper housing 5, allows operators to easily observe the filter's operating status. The high-pressure differential pressure gauge 3 collects the pressure difference between the inlet and outlet ends via two connecting pipes. If the pressure difference value continues to increase, it indicates that the filter element 13 may be clogged, prompting maintenance or replacement. The sealing ring 12 between the upper housing 5 and the lower housing 6 effectively resists the risk of high-pressure gas leakage, ensuring the overall system's sealing reliability and operational safety. This approach improves the safety performance and operational convenience of the entire machine under high-pressure environments. The high-pressure differential pressure gauge 3 enables real-time monitoring of the filter element's clogging status, enhancing the timeliness of maintenance and preventing system malfunctions caused by filter element blockage. The sealing ring 12 ensures airtightness between the upper housing 5 and the lower housing 6, significantly improving the filter's reliability and durability, and effectively extending its service life.

[0041] The shape and position of the mounting bracket 11 can be adjusted according to the on-site installation requirements, such as a beam type or a clamp type; the high pressure differential gauge 3 can also be replaced with an electronic differential pressure transmitter, which supports remote data transmission and alarm functions; the high pressure end pipe 2 and the low pressure end pipe 1 can be connected by quick-connect fittings, welding, or other methods; the sealing ring 12 can also be an O-ring, V-ring, or multi-lip seal, which can be optimized and selected according to the sealing performance and material characteristics.

[0042] In one possible implementation, the drain port 28 of the lower housing 6 is provided with a sealing surface 30 and a fixing surface 31, and the rotary joint 9 is provided with a sealing surface 33 and a fixing surface 32 respectively; the sealing ring 15 is installed in the sealing ring mounting groove 34, and the sealing ring mounting groove 34 is provided on the sealing surface 33; the elastic retaining ring mounting groove 29 is provided on the fixing surface 32, so that the sealing surface 33 and the fixing surface 32 can reliably cooperate with the sealing surface 30 and the fixing surface 31 of the lower housing 6 respectively.

[0043] This embodiment achieves rapid installation and secure sealing of the rotary joint 9 through a precise fit design between the sealing surface and the fixed surface, combined with the limiting method of the elastic retaining ring 16; the sealing ring 2 15 provides high-pressure sealing force in the position of the sealing ring 2 mounting groove 34 to ensure that the drain port does not leak under pressure; the mechanical contact between the fixed surface 2 32 and the fixed surface 1 31 ensures the positioning accuracy and stress strength of the connecting parts.

[0044] The optimization of the sealing structure improves the sealing safety and structural stability of the drain port (28); the modular rotary joint design facilitates maintenance and replacement, improving the reliability and maintenance efficiency of the system; the snap ring installation method avoids the problems of difficult fastening and uneven sealing caused by traditional threaded connections, improving the connection quality and assembly convenience.

[0045] The sealing structure inside the drain port 28 can be selected from metal sealing surfaces or flexible material sealing rings according to the operating pressure; the sealing ring 15 can be made of different materials such as fluororubber and silicone to adapt to different media and temperature conditions; the sealing structure of the rotary joint 9 can also adopt surface sealing, conical sealing and other forms to improve the sealing level and installation flexibility.

[0046] In one possible implementation, the U-shaped opening of the elastic retaining ring 16 is provided with lead-sealing holes 35 at both ends. After the elastic retaining ring 16 is installed in place, it is sealed with a stainless steel wire passing through the lead-sealing holes 35 to prevent the elastic retaining ring 16 from accidentally coming out of the retaining ring mounting hole 26 of the lower housing 6, thereby improving the stability of the installation structure and the safety during use.

[0047] This structure achieves a visible and operable anti-slip sealing structure by designing lead-sealing holes 35 at both ends of the U-shaped elastic retaining ring 16. After the elastic retaining ring 16 is inserted into the retaining ring mounting hole 26 and locked into the elastic retaining ring mounting groove 29 of the rotary joint 9, the operator can use stainless steel wire to perform lead sealing, keeping the elastic retaining ring in a restricted state and preventing it from slipping out. This method ensures the axial locking force of the retaining ring without affecting the rotation function of the rotary joint 9.

[0048] The use of a lead seal structure significantly improves the safety of the elastic retaining ring 16, effectively preventing the retaining ring from loosening or shifting due to vibration, temperature difference or other external forces under high pressure, and enhancing the stability of the entire drainage system; the use of stainless steel wire as the lead seal material has excellent corrosion resistance and anti-aging ability, and is suitable for complex working conditions such as high pressure and high humidity.

[0049] The lead seal method can be replaced by metal buckles, rivet locks or laser welding points; the elastic retaining ring can be changed to a non-U-shaped structure, such as a C-shaped or closed O-shaped retaining ring, depending on the specific installation space; the sealing material can also be non-metallic flexible fixing methods such as explosion-proof nylon cable ties and glued iron wire, to adapt to different protection levels or electrical safety requirements.

[0050] In one possible implementation, the filter element 13 includes a sealing ring 17, an upper end cap 18, a first filter layer 19, a second filter layer 20, a third filter layer 21, and a lower end cap 22, all of which are assembled into one piece by welding. The first filter layer 19 is made of stainless steel sintered mesh plate rolled and welded, which has good air permeability and mechanical strength. The second filter layer 20 is a stainless steel powder sintered tube, which has high filtration accuracy and pore uniformity. The third filter layer 21 is a Teflon spray coating layer applied to the surface of the second filter layer 20, forming a strong oleophobic layer with a thickness of 25μm to 60μm. The filter element 13 is made entirely of stainless steel and has the function of being disassembled, cleaned, and reused.

[0051] Solid particles and liquid oil and water in the air are blocked and separated in turn when passing through multi-stage filter layers. The strong pore layer of filter layer 21 can prevent oil particles from adhering and form a bridging oil film, thereby avoiding clogging of pores. The sealing ring 17 is set at the contact point between filter element 13 and upper housing 5 to ensure airtightness between high-pressure and low-pressure sides and prevent gas crossflow and pressure difference loss. The welded integrated structure ensures the overall strength of the filter element and is suitable for continuous operation under high pressure differential environment.

[0052] This filter cartridge structure ensures high-efficiency filtration performance while significantly reducing usage and maintenance costs; its washable and reusable nature avoids the consumption and environmental burden associated with disposable filter media; and its three-layer composite filter media design combines mechanical strength, filtration accuracy, and anti-clogging performance, providing long-term and stable filtration assurance for high-pressure gas processing.

[0053] The surface treatment process of filter layer 3 21 can be replaced by silane modification, plasma treatment or nano hydrophobic coating; the bonding between filter layer 19 and filter layer 20 can be changed from sintering to mechanical fitting or bonding; the shape of filter element 13 can be changed to elliptical, square or corrugated according to the shell design to improve the filtration capacity per unit area; the material can also be selected from highly corrosion resistant materials such as titanium alloy and nickel-based alloy to adapt to special media.

[0054] In one possible implementation, the anti-entrapment plate 14 is installed on the top of the liquid collection chamber 27. Multiple anti-entrapment oblique holes 25 with fixed inclination angles are evenly opened in the circumferential direction of the plate body to form a structure similar to an directional blade. The center of the lower end cover 22 is connected to the fixing hole 24 of the anti-entrapment plate 14 through the anti-entrapment plate fixing rod 23 and is locked with a nut. This structural design allows the oil-water mixture to settle by gravity, but can effectively suppress the upward roll-back of droplets caused by eddies and prevent unseparated oil and water from re-entering the gas channel.

[0055] When the high-speed airflow enters the lower housing 6, it carries some liquid particles. After encountering the anti-entrainment plate 14, the particles impact the plate surface or sink along the inclined hole 25. Since the direction of the inclined hole is fixed and the gap is controlled, the vertical roll-back speed can be weakened, causing the droplets to fall into the liquid collection chamber 27 along the inclined hole. The central fixed rod structure makes the filter element 13 accurately positioned, and at the same time facilitates disassembly and maintenance.

[0056] This design structurally blocks the reverse migration path of oil and water particles, greatly reducing the risk of oil contamination in the output gas and effectively improving separation efficiency; the oblique hole design is simple, requires no power, requires low maintenance, and has a stable and reliable structure; the central fixed structure further enhances the filter element's shock resistance stability under high pressure.

[0057] The number and angle of the anti-pinch oblique holes 25 can be adjusted according to the flow rate and particle size; the plate material can be made of corrosion-resistant and lightweight materials such as aluminum alloy and polytetrafluoroethylene; the fixing structure can also adopt tool-free installation schemes such as snap-on type and sliding groove type; the fixing rod 23 can be a built-in threaded pin, providing a more compact assembly scheme.

[0058] This utility model's multifunctional high-pressure air filter introduces compressed air through inlet connector 4. The airflow flows from the outside of the filter element 13 to the inside, and solid particles, liquid oil and water, and other impurities are separated step by step in the three-layer composite filter element composed of filter layer one 19, filter layer two 20, and filter layer three 21. Clean gas is discharged from outlet connector 10. An anti-entrapment plate 14 is provided below the filter element 13. The anti-entrapment plate 14 has multiple anti-entrapment inclined holes 25 with fixed inclination angles, which can effectively prevent oil and water particles from being drawn into the clean airflow channel due to the eddy effect. After separation... Oil and water particles settle into the collection chamber 27 under gravity and are discharged through a drainage device consisting of a drain port 28, a rotary joint 9, a drain valve 7, and a drain port connector 8. This device supports installation in any direction along the rotation axis of 360 degrees, adapting to complex site layout requirements. The upper housing 5 and the lower housing 6 are sealed under high pressure through threaded fit and sealing ring 12. Sealing ring 17 ensures airtight connection between the filter element 13 and the housing. The whole machine has a compact structure and reliable sealing, and is suitable for high-efficiency gas purification under high pressure conditions above 20MPa.

[0059] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A multifunctional high-pressure air filter, comprising an upper housing (5), a lower housing (6), a drain valve (7), and a filter element (13), characterized in that: The lower housing (6) is equipped with an anti-entrapment plate (14). The lower end of the filter element (13) is threadedly connected to the anti-entrapment plate (14), and the upper end of the filter element (13) abuts against the upper housing (5). The anti-entrapment plate (14) is provided with anti-entrapment oblique holes (25) in the circumferential direction. The lower cavity of the anti-entrapment plate (14) is provided as a liquid collection cavity (27). The upper housing (5) is threadedly connected to the lower housing (6). An outlet connector (10) is provided on the left side of the upper housing (5), and an inlet connector (4) is provided on the upper housing (5) for discharge. The liquid valve (7) is connected to the drain port (28) of the lower housing (6) through the rotary joint (9). A retaining ring mounting hole (26) is provided at the drain port (28). A sealing ring II (15) is provided between the rotary joint (9) and the drain port (28). An elastic retaining ring (16) passes through the retaining ring mounting hole (26). The elastic retaining ring (16) is locked in the elastic retaining ring mounting groove (29) of the rotary joint (9). The elastic retaining ring (16) is set in a U-shaped structure. The outlet of the drain valve (7) is connected to a drain port connector (8).

2. The multifunctional high-pressure air filter according to claim 1, characterized in that: The upper housing (5) is fitted onto the lower housing (6) and connected by threads. A sealing ring (12) is provided between the upper housing (5) and the lower housing (6). A mounting bracket (11) is provided on one side of the upper end of the upper housing (5). A high pressure differential gauge (3) is provided on the side of the mounting bracket (11). The high pressure differential gauge (3) is connected to the high pressure side of the filter through the high pressure end pipe (2). The high pressure differential gauge (3) is connected to the low pressure side of the filter through the low pressure end pipe (1).

3. A multifunctional high-pressure air filter according to claim 1, characterized in that: The drain port (28) of the lower housing (6) is provided with a sealing surface (30) and a fixing surface (31). The rotary joint (9) is provided with a sealing surface (33) and a fixing surface (32). The sealing surface (33) is provided with a sealing ring mounting groove (34). The sealing ring (15) is installed in the sealing ring mounting groove (34). The elastic retaining ring mounting groove (29) is installed on the fixing surface (32). The sealing surface (33) and the fixing surface (32) are respectively fitted to the sealing surface (30) and the fixing surface (31) of the lower housing (6).

4. A multifunctional high-pressure air filter according to claim 1, characterized in that: The elastic retaining ring (16) has lead sealing holes (35) at both ends of the U-shaped opening. After the elastic retaining ring (16) is installed, the elastic retaining ring (16) is sealed with anti-loosening lead by stainless steel wire.

5. A multifunctional high-pressure air filter according to claim 1, characterized in that: The filter element (13) consists of a sealing ring three (17), an upper end cover (18), a filter layer one (19), a filter layer two (20), a filter layer three (21), and a lower end cover (22), and is assembled into one piece by welding. The filter layer one (19) is made of stainless steel sintered mesh plate rolled and welded into a cylinder. The filter layer two (20) is made of stainless steel powder sintered tube. The filter layer three (21) is a strong sparse layer formed by Teflon spraying on the surface of the filter layer two (20). The thickness of the sprayed strong sparse layer is 25um to 60um. The sealing ring three (17) is set between the upper end cover (18) and the upper shell (5).

6. A multifunctional high-pressure air filter according to claim 1, characterized in that: An anti-clamping plate (14) is installed on top of the liquid collection chamber (27), and the anti-clamping oblique hole (25) has a fixed tilt angle.

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