Dry filter and air dryer

Abstract

The utility model belongs to air dryer technical field discloses a kind of drying filter element and air dryer.Drying filter element includes inner cylinder, cylinder cover and drying agent, and the one end of inner cylinder is provided with assembly opening, and the other end bottom wall of inner cylinder is provided with several air outlet holes;Cylinder cover is set at the assembly opening of inner cylinder, and dry chamber is formed between cylinder cover and inner cylinder, and cylinder cover includes cover body, inner ring body, spring seat and tab connected in order from outside to inside, and inner ring body is recessed along the direction of cylinder cover towards inner cylinder, and cover body is evenly provided with several first air inlet holes, and spring seat is evenly provided with several second air inlet holes, and tab is evenly provided with several third air inlet holes;Drying agent is filled in dry chamber.The utility model not only can reduce pressure loss, but also can enhance drying effect.

Description

Technical Field

[0001] This utility model relates to the field of air dryer technology, and in particular to a drying filter element and an air dryer. Background Technology

[0002] An air dryer is an essential component of air-brake vehicle braking systems. Its main function is to adsorb and dry compressed air from the air compressor, preventing water from entering the air passages and causing problems such as icing, corrosion, and damage to parts. An air dryer consists of a drying filter element, a threaded cover, a housing, and springs. The drying filter element is assembled inside the outer cylinder formed by the threaded cover and the housing, and its main tasks are drying, filtering, and separating; it is the core component of the air dryer. The drying filter element is composed of several parts, with the cylinder cover being one of the essential components. Since air must first pass through the air inlet holes on the cylinder cover before flowing through the desiccant, the number of air inlet holes determines the airflow area.

[0003] Currently, the number of air inlets on commonly used cylinder caps is not maximized, resulting in significant air pressure loss and indirectly reducing the airflow during inflation. In addition, the desiccant directly below the non-perforated area of ​​the cylinder cap is wasted because no air flows through it. Utility Model Content

[0004] The purpose of this invention is to provide a drying filter element and an air dryer that can not only reduce pressure loss but also enhance the drying effect.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Drying filter element, including:

[0007] The inner cylinder has an assembly opening through one end and several air vents on the bottom wall of the other end.

[0008] A cylindrical cover is disposed at the assembly opening of the inner cylinder, and a drying chamber is formed between the cylindrical cover and the inner cylinder. The cylindrical cover includes a cover body, an inner ring body, a spring seat, and a protruding plate connected sequentially from the outside to the inside. The inner ring body is recessed along the direction of the cylindrical cover toward the inner cylinder. A plurality of first air inlets are evenly distributed on the cover body, a plurality of second air inlets are evenly distributed on the spring seat, and a plurality of third air inlets are evenly distributed on the protruding plate.

[0009] A desiccant is filled into the drying chamber.

[0010] As an optional solution for the drying filter element, the spring seat is provided with a plurality of first reinforcing ribs spaced circumferentially. The first reinforcing ribs extend radially along the cylinder cover, and a second air inlet is provided between two adjacent first reinforcing ribs.

[0011] As an optional solution for the drying filter element, the inner ring body is provided with a plurality of second reinforcing ribs spaced circumferentially, and the second reinforcing ribs extend in a direction parallel to the axis of the cylinder cover.

[0012] As an optional solution for the drying filter element, the first reinforcing rib and the second reinforcing rib are connected in sequence.

[0013] As an optional solution for the drying filter element, the cover is provided with a plurality of third reinforcing ribs spaced circumferentially, the third reinforcing ribs extending radially along the cover, and the first air inlet is provided between two adjacent third reinforcing ribs.

[0014] As an optional solution for the drying filter element, the inner ring body is evenly distributed with a number of fourth air inlets, and the fourth air inlets are provided between two adjacent second reinforcing ribs.

[0015] As an optional solution for the drying filter element, the drying filter element further includes:

[0016] A first baffle is disposed in the drying chamber, and the first baffle is located between the cover and the desiccant;

[0017] A second baffle is disposed within the drying chamber, and the second baffle is located between the spring seat and the desiccant;

[0018] The third baffle is disposed in the drying chamber. The third baffle is located between the bottom wall of the inner cylinder and the desiccant. The first baffle, the second baffle and the third baffle are made of non-woven fabric.

[0019] As an optional solution for the drying filter element, two third baffles are provided, and the drying filter element further includes:

[0020] A fine filter sheet, located between the two third baffles, is made of glass fiber.

[0021] As an optional solution for the drying filter element, the drying filter element further includes a one-way valve assembly and a paper core assembly. The inner cylinder includes a first cylinder and a second cylinder connected in sequence. The outer diameter of the first cylinder is larger than the outer diameter of the second cylinder. A first glue injection groove is provided on the outer wall surface at the junction of the first cylinder and the second cylinder. The one-way valve assembly is provided with a second glue injection groove. One end of the paper core assembly is disposed in the first glue injection groove, and the other end of the paper core assembly is disposed in the second glue injection groove.

[0022] An air dryer includes an outer cylinder, a compression spring located inside the outer cylinder, and a drying filter element as described above. One end of the compression spring abuts against the top wall of the outer cylinder, and the other end of the compression spring abuts against the spring seat of the cylinder cover.

[0023] The beneficial effects of this utility model are:

[0024] The drying filter element provided by this utility model has a cap assembled into the assembly opening of the inner cylinder. The desiccant is located in the drying chamber formed by the cap and the inner cylinder. The inner ring is recessed along the direction of the cap towards the inner cylinder. The spring seat between the inner ring and the convex plate is used to assemble the compression spring, which facilitates the installation of the drying filter element into the air dryer. The bottom wall of the inner cylinder is provided with several air outlets. The cap body, spring seat, and convex plate are respectively provided with several first air inlets, several second air inlets, and several third air inlets. While ensuring the structural strength of the cap, the number of air inlets is increased as much as possible to increase the flow area. This not only reduces pressure loss but also allows air to flow fully over the desiccant directly below the cap, enhancing the drying effect.

[0025] The air dryer provided by this utility model uses a compression spring to assemble the drying filter element into the outer cylinder, reducing the pressure loss of air flow and ensuring the drying effect of the air. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0027] Figure 1 This is a half-section assembly diagram of the drying filter element in an embodiment of this utility model;

[0028] Figure 2 This is a half-sectional view of the inner cylinder in an embodiment of the present invention;

[0029] Figure 3 This is a half-sectional view of the cap in an embodiment of the present utility model;

[0030] Figure 4 This is a half-sectional view of the one-way valve assembly in an embodiment of the present invention;

[0031] Figure 5 This is an exploded view of the half-section structure of the paper core assembly in an embodiment of this utility model;

[0032] Figure 6This is a schematic diagram of air flow inside the air dryer in an embodiment of this utility model.

[0033] Figure label:

[0034] 001. Outer cylinder; 002. Compression spring;

[0035] 1. Inner cylinder; 2. Cylinder cover; 3. Desiccant; 4. First baffle; 5. Second baffle; 6. Third baffle; 7. Fine filter; 8. One-way valve assembly; 9. Paper core assembly;

[0036] 11. First cylinder; 111. First glue injection tank; 12. Second cylinder; 121. Air outlet;

[0037] 21. Cover; 211. First air inlet; 212. Third reinforcing rib; 22. Inner ring; 221. Second reinforcing rib; 23. Spring seat; 231. Second air inlet; 232. First reinforcing rib; 24. Protruding plate; 241. Third air inlet;

[0038] 81. Seat body; 811. Second glue injection groove; 82. One-way valve;

[0039] 91. Central tube; 92. Inner lining mesh; 93. Filter paper; 94. Inner lining mesh; 95. Absorbent cotton. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0044] As a key component of air brake systems in vehicles, the importance of air dryers is self-evident. During vehicle braking, stable and dry compressed air is the cornerstone of ensuring the efficient and safe operation of the braking system. Air dryers are the core equipment responsible for this crucial task. Their main function is to deeply process the compressed air output from the air compressor—effectively removing moisture, oil, and other impurities from the air through adsorption drying technology, thereby preventing these harmful substances from entering the air passage system. Once moisture enters the air passage, it easily freezes in low-temperature environments, leading to blockages. Simultaneously, moisture contact with metal components can cause corrosion, accelerating the aging and damage of parts, severely impacting the reliability and lifespan of the braking system.

[0045] Structurally, an air dryer is a precise and complex device, composed of multiple components including a drying filter element, a threaded cover, a robust outer shell, and elastic springs. The drying filter element, as the "heart" of the entire dryer, is meticulously assembled within the inner cavity of the outer cylinder formed by the threaded cover and the outer shell. This core component not only bears the heavy responsibility of deeply drying compressed air but also filters and separates fine particles and liquid water from the air, ensuring that the output air meets extremely high purity standards. The drying filter element itself is also a highly integrated component, assembled from multiple precision-machined parts, with the cylinder cover being an indispensable part of these components.

[0046] The design of the cylinder cover directly affects the performance of the dryer. Specifically, before entering the dryer filter element, air must first pass through carefully arranged air inlets on the cylinder cover. These air inlets are not only channels for airflow but also key factors determining the airflow area. However, the cylinder cover designs widely used in the market today do not achieve an optimal configuration in the number of air inlets. This design deficiency directly leads to significant pressure loss when air flows through the cylinder cover, thus affecting the airflow efficiency during the inflation process. In other words, due to the limited number of air inlets, air must overcome greater resistance as it passes through, which not only reduces the dryer's operating efficiency but may also adversely affect the response speed of the braking system.

[0047] More seriously, the desiccant directly beneath the unperforated areas of the cylinder cover is essentially "idle" due to the lack of air flow. This portion of the desiccant cannot perform its intended adsorption function, resulting in a significant waste of resources. Therefore, maximizing the number of air inlets in the cylinder cover design to improve airflow efficiency and reduce desiccant waste has become an important direction for improving the performance of air dryers.

[0048] To reduce pressure loss and enhance drying effect, this embodiment provides a drying filter element and an air dryer, which are described below. Figures 1 to 6 The specific content of this embodiment will be described in detail.

[0049] like Figures 1 to 5As shown, the drying filter element in this embodiment, as a core component of the compressed air drying system, mainly includes an inner cylinder 1, a cylinder cover 2, and a desiccant 3 filling the space between them. The inner cylinder 1 serves as the basic support structure for the entire filter element, with a through-type assembly opening at one end. This design not only facilitates tight assembly with the cylinder cover 2 but also greatly facilitates subsequent maintenance and replacement. The bottom wall of the other end of the inner cylinder 1 has several evenly distributed air outlets 121. These air outlets 121 act as precise airflow conduits, ensuring that the dried air can smoothly flow out of the filter element and into the subsequent air path system. The cylinder cover 2 is located at the assembly opening of the inner cylinder 1, forming a closed and efficient drying chamber together with the inner cylinder 1. The cylinder cover 2 itself is connected sequentially from the outside to the inside by a cover body 21, an inner ring body 22, a spring seat 23, and a protruding plate 24, each part carrying a specific function. The inner ring body 22 is recessed along the direction of the cylinder cover 2 towards the inner cylinder 1. Several first air inlets 211 are evenly distributed on the cover 21, allowing dirty air from the outside to initially enter the filter element. Several second air inlets 231 are provided on the spring seat 23, and several third air inlets 241 are also evenly distributed on the protruding plate 24. These air inlets correspond to the first air inlets 211 on the cover 21, further widening the airflow channel and ensuring that air can flow evenly and fully into the desiccant 3 area. The desiccant 3 is filled in the drying chamber. The desiccant 3 can be composed of a high-efficiency molecular sieve, a silica-alumina gel with excellent adsorption performance, or an optimized mixture of the two. With its strong adsorption capacity, the desiccant 3 can quickly capture and fix moisture, oil, and other trace impurities in the air, thereby ensuring that the output air meets extremely high standards of dryness and purity.

[0050] The drying filter element provided by this utility model has an air outlet 121 on the bottom wall of the inner cylinder 1 that cooperates with the first air inlet 211, the second air inlet 231, and the third air inlet 241 on the upper cover 21, the spring seat 23, and the protruding plate 24 to form a highly efficient and unobstructed airflow channel. This design maximizes the number of air inlets while ensuring the structural strength of the cover 2, thus significantly increasing the airflow area. First, the increased flow area effectively reduces the pressure loss of air flowing through the filter element, allowing air to enter and exit the filter element more smoothly, improving the efficiency of the entire drying system. Second, due to the uniform distribution of the air inlets, air can fully flow through the desiccant 3 area directly below the cover 2, ensuring that every portion of the desiccant 3 is fully utilized, thereby greatly enhancing the drying effect. Furthermore, this design also increases the dust holding capacity and service life of the filter element, reduces the need for frequent filter element replacement, and lowers maintenance costs.

[0051] Furthermore, the spring seat 23 is circumferentially spaced with several first reinforcing ribs 232, which extend radially along the cover 2, significantly enhancing the overall structural strength of the spring seat 23. Second air inlets 231 are provided in the area between adjacent first reinforcing ribs 232. This layout ensures that air can smoothly enter the drying chamber through the air inlets while making full use of space, enhancing structural strength without sacrificing air intake efficiency. By adding the first reinforcing ribs 232, the spring seat 23 can maintain a more stable shape when subjected to spring pressure and dynamic loads generated by airflow, effectively preventing deformation or damage that may occur due to long-term use, thereby extending the service life of the filter element.

[0052] Furthermore, the inner ring 22 is provided with several second reinforcing ribs 221 spaced circumferentially, and the second reinforcing ribs 221 extend in a direction parallel to the axis of the cylinder cover 2. By adding the second reinforcing ribs 221, the structural strength of the inner ring 22 is greatly improved, so that the inner ring 22 can remain stable and undeformed when faced with stress from all directions.

[0053] Furthermore, the first reinforcing rib 232 and the second reinforcing rib 221 are connected in sequence. This design not only enhances the connection strength between the various parts of the cover 2, making the entire cover 2 structure more compact and stable, but also improves the adaptability and reliability of the filter element under complex working conditions. When the filter element is subjected to harsh environments such as vibration, impact, or temperature changes, the connected reinforcing ribs can jointly disperse and bear the stress, effectively preventing structural damage caused by local stress concentration.

[0054] Furthermore, the cover 21 is circumferentially spaced with several third reinforcing ribs 212, which extend radially along the cover 2. A first air inlet 211 is provided between each adjacent third reinforcing rib 212. This ensures that the area between adjacent third reinforcing ribs 212 is not wasted. While ensuring that air can enter the filter element without obstruction through the first air inlet 211, the third reinforcing ribs 212 also provide strong structural support for the cover 21. By adding the third reinforcing ribs 212, the cover 21 can maintain a more stable shape when facing external forces from various directions, such as pressure during installation and impact forces generated by airflow. This greatly improves the structural strength of the cover 21 and effectively avoids problems such as deformation and cracking of the cover 21 due to long-term use or external impacts, thereby ensuring the overall sealing and stability of the filter element.

[0055] Optionally, the first reinforcing rib 232, the second reinforcing rib, and the third reinforcing rib 212 are connected sequentially. The first reinforcing rib 232 is circumferentially spaced on the spring seat 23 and extends radially along the cover 2, providing solid support for the spring seat 23 and enhancing its ability to withstand spring pressure and dynamic air loads. The second reinforcing rib 221 is circumferentially spaced on the inner ring 22 and extends in a direction parallel to the axis of the cover 2, effectively improving the structural strength of the inner ring 22 and enabling it to remain stable under complex stresses. The layout of the third reinforcing rib 212 on the cover 21 provides reliable support for the cover 21. When the reinforcing ribs of these three parts are connected sequentially, the entire structure of the cover 2 forms an organic whole, and the stress transmission between the parts is more uniform and reasonable.

[0056] For example, in this embodiment, the cover 21 has a spherical arc shape. Compared with the traditional planar cover 21 design, the spherical arc shape extends more space into the drying chamber for the same outer diameter. The increased volume of the drying chamber provides more ample space for the desiccant 3. More desiccant 3 means stronger adsorption capacity, enabling more thorough capture and fixation of moisture, oil, and other trace impurities in the air. During compressed air drying, the air needs to have sufficient contact and reaction with the desiccant 3 to achieve efficient drying. The increased volume of the drying chamber allows the air to come into contact with more of the desiccant 3 surface as it flows through, prolonging the contact time between the air and the desiccant 3, thereby greatly improving drying efficiency.

[0057] Optionally, a plurality of fourth air inlets (not shown in the figure) are evenly distributed on the inner ring 22, and a fourth air inlet is provided between each two adjacent second reinforcing ribs 221. First, this further increases the number of air inlets. Compared to relying solely on air inlets on the cover 21, spring seat 23, and protruding plate 24, the addition of fourth air inlets provides more channels for air to enter the drying chamber, greatly improving airflow. More air inlets mean that air can enter the drying chamber more smoothly and make full contact with the desiccant 3, thereby improving drying efficiency. Second, from the perspective of reducing flow resistance, the setting of the fourth air inlets plays a crucial role. During airflow, any obstruction can lead to pressure loss and energy consumption. The evenly distributed fourth air inlets provide relatively independent and smooth channels for air. For a compressed air drying system, reducing flow resistance means reducing compressor energy consumption, improving the energy utilization efficiency of the entire system, and thus reducing operating costs. In addition, the even distribution of the fourth air inlets also helps to improve the uniformity of air distribution within the drying chamber. Because air can enter the drying chamber from multiple directions through the fourth air inlet, excessive concentration or scarcity of air in localized areas is avoided. This allows the desiccant 3 to contact the air more evenly, fully utilizing its adsorption effect and preventing premature saturation of some desiccant 3 or underutilization of some desiccant 3 due to uneven air distribution. This extends the service life of the desiccant 3 and improves the overall performance and reliability of the drying filter element.

[0058] Furthermore, the drying filter element also includes a first baffle 4, a second baffle 5, and a third baffle 6. The first baffle 4 is disposed within the drying chamber, located between the cover 21 and the desiccant 3. The second baffle 5 is disposed within the drying chamber, located between the spring seat 23 and the desiccant 3. The third baffle 6 is disposed within the drying chamber, located between the bottom wall of the inner cylinder 1 and the desiccant 3. The first, second, and third baffles are made of non-woven fabric. In preventing desiccant 3 leakage, these three baffles form a comprehensive protection system. Regardless of the direction of airflow impact or mechanical vibration affecting the desiccant 3, the baffles can effectively block it, greatly reducing the risk of desiccant 3 leakage and improving the safety and reliability of the filter element. Secondly, in terms of ensuring air permeability, the non-woven fabric baffles have excellent air permeability, ensuring smooth airflow within the drying chamber. Air can freely pass through the tiny pores on the baffles, making full contact and reacting with the desiccant 3, thereby achieving a highly efficient drying effect. In addition, the baffles also play a preliminary filtering role in the air, removing some impurities from the air, extending the service life of the desiccant 3, and reducing the maintenance cost of the filter element.

[0059] Furthermore, two third baffles 6 are provided, and the dryer filter element also includes a fine filter 7, which is located between the two third baffles 6. The fine filter 7 is made of glass fiber. Glass fiber has a unique microstructure, composed of countless tiny glass fibers interwoven to form a dense and complex mesh structure. Glass fiber not only possesses excellent mechanical strength, able to withstand certain pressure and deformation without damage, but also has excellent filtration performance; the tiny gaps between its fibers can effectively intercept tiny particulate impurities in the air. The two third baffles 6 tightly sandwich the fine filter 7 in the middle, acting as a protective layer for it. The third baffles 6 provide solid physical support for the fine filter 7. During filter element operation, airflow generates certain impact forces and vibrations, and the presence of the third baffles 6 prevents the fine filter 7 from shifting, deforming, or being damaged by these external forces, ensuring that the fine filter 7 always remains in the correct position and performs its proper filtration function. From the perspective of filtration effect, this multi-layer stacked design brings significant technological improvements. When air flows in from the bottom wall of the inner cylinder 1, after being treated by the desiccant 3, it first encounters the third baffle 6 at the top. The third baffle 6, with its non-woven fabric material, performs preliminary filtration, removing larger particulate impurities and reducing the burden on subsequent filtration stages. Next, the air passes through the fine filter 7, made of glass fiber. The fine filter 7, with its dense fiber structure, performs deep filtration of tiny particles, dust, oil mist, and other contaminants in the air. These tiny particles are intercepted by the fibers and adhere to their surface as they pass through the fine filter 7, achieving highly efficient air purification. Finally, the air filtered by the fine filter 7 passes through the third baffle 6 at the bottom, further ensuring that no impurities are missed and guaranteeing the cleanliness of the output air. Compared to traditional single-layer filtration structures, this multi-layer stacked design, with two third baffles 6 sandwiching the fine filter 7, can capture impurities with smaller diameters, greatly improving the fineness of the filtration and significantly enhancing the quality of the air after treatment by the filter element. In terms of filtration efficiency, the multi-layer filtration structure can work together, with each layer undertaking different filtration tasks, reducing the burden on a single filtration layer and thus improving the overall filtration speed and efficiency.

[0060] Furthermore, the drying filter element also includes a one-way valve assembly 8 and a paper core assembly 9. The paper core assembly 9, from the inside out, includes a central tube 91, an inner lining mesh 94, filter paper 93, an outer lining mesh, and absorbent cotton 95. Specifically, the one-way valve assembly 8 includes a seat 81 made of plastic and a one-way valve 82 made of rubber, which are integrally formed. The seat 81 of the one-way valve assembly 8 is provided with a second glue injection groove 811. The inner cylinder 1 includes a first cylinder 11 and a second cylinder 12 connected in sequence. The outer diameter of the first cylinder 11 is larger than the outer diameter of the second cylinder 12. The outer wall surface at the junction of the first cylinder 11 and the second cylinder 12 is provided with a first glue injection groove 111. The one-way valve assembly 8 is provided with a second glue injection groove 811. One end of the paper core assembly 9 is disposed in the first glue injection groove 111, and the other end of the paper core assembly 9 is disposed in the second glue injection groove 811. Specifically, the upper and lower ends of the paper core assembly 9 are inserted into the first glue injection groove 111 and the second glue injection groove 811, respectively, and are bonded to the inner cylinder 1 and the one-way valve assembly 8 with filter paper 93 glue.

[0061] This embodiment also provides an air dryer, such as Figure 6 As shown, the air dryer includes an outer cylinder 001, a compression spring 002 located inside the outer cylinder 001, and the aforementioned drying filter element. One end of the compression spring 002 abuts against the top wall of the outer cylinder 001, and the other end of the compression spring 002 abuts against the spring seat 23 of the cylinder cover 2. When this air dryer is in use: the drying filter element is assembled inside the air dryer, its upper end is fixed by the compression spring 002, and the bottom of the compression spring 002 abuts against the first reinforcing rib 232 of the cylinder cover 2 to prevent blocking the second air inlet 231, allowing air to pass through the second air inlet 231. From the perspective of achieving the drying function, the drying filter element only requires three parts: the inner cylinder 1, the cylinder cover 2, and the desiccant 3. Other parts are added for filtering impurities, separating oil stains, and regenerating wastewater. During inflation (e.g.) Figure 6As shown), dirty air from the air compressor enters the dryer. Before passing through the dryer filter, the paper core assembly 9 can agglomerate the liquid oil in the air, forming larger diameter oil droplets, which settle under gravity. At the same time, it can filter most of the impurities in the air. The moisture, suspended oil, and a small amount of impurities in the air continue to flow upward with the air, passing through the first air inlet 211, the second air inlet 231, and the third air inlet 241 on the cylinder cover 2, passing through the first baffle 4 and the second baffle 5, and flowing to the desiccant 3. The moisture in the air is absorbed by the desiccant 3. Then the air passes through the upper third baffle 6 and reaches the fine filter 7, which can further agglomerate and absorb the suspended oil in the air, as well as filter out the remaining impurities. The air treated in the above way is very clean. The clean air then passes through the lower third baffle 6, flows out of the dryer through the air outlet 121, and then flows to the inflation valve chamber on the base. Finally, most of it flows to the main gas cylinder, and a small amount flows to the backflushing gas cylinder. Compared with existing technologies: 1. The addition of a second air inlet 231 to the cap 2 effectively increases the airflow area, reducing resistance and indirectly increasing airflow. Without the second air inlet 231, no air would flow through the desiccant 3 directly below it, resulting in waste of this portion of the desiccant 3. 2. The addition of a second air inlet 231 to the cap 2 also allows for a more even airflow through the desiccant 3 during backflushing, removing as much water as possible from the desiccant 3. Without the second air inlet 231, the probability of water being removed from the desiccant 3 directly below it would be reduced, making the next... The drying effect of desiccant 3 is further weakened during the first inflation stage; third, the first reinforcing rib 232 on the cover 2, in addition to increasing structural strength, protrudes from the spring seat 23 and can support the bottom of the compression spring 002, preventing it from blocking the second air inlet 231, allowing air to pass through the second air inlet 231; fourth, the cover body 21 of the cover 2 is designed as a spherical arc shape similar to the top shape of the outer shell, which can hold more desiccant 3 and absorb more water compared to a flat shape; in general, by optimizing the structure of the cover 2 of the dryer filter element, the number of air inlets is increased, pressure loss is reduced, the utilization rate of desiccant 3 is improved, and the effect of the dryer is enhanced.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A drying filter element, characterized in that, include: Inner cylinder (1), one end of the inner cylinder (1) is provided with an assembly opening, and the bottom wall of the other end of the inner cylinder (1) is provided with a plurality of air outlets (121); A cylindrical cover (2) is provided at the assembly opening of the inner cylinder (1). A drying chamber is formed between the cylindrical cover (2) and the inner cylinder (1). The cylindrical cover (2) includes a cover body (21), an inner ring body (22), a spring seat (23), and a protruding plate (24) connected sequentially from the outside to the inside. The inner ring body (22) is recessed along the direction of the cylindrical cover (2) toward the inner cylinder (1). A plurality of first air inlets (211) are evenly distributed on the cover body (21). A plurality of second air inlets (231) are evenly distributed on the spring seat (23). A plurality of third air inlets (241) are evenly distributed on the protruding plate (24). Desiccant (3) is filled into the drying chamber.

2. The drying filter element according to claim 1, characterized in that, The spring seat (23) is provided with a plurality of first reinforcing ribs (232) spaced apart in the circumferential direction. The first reinforcing ribs (232) extend radially along the cylinder cover (2). A second air inlet (231) is provided between two adjacent first reinforcing ribs (232).

3. The drying filter element according to claim 2, characterized in that, The inner ring (22) is provided with a plurality of second reinforcing ribs (221) spaced apart in the circumferential direction, and the second reinforcing ribs (221) extend in a direction parallel to the axis of the cylinder cover (2).

4. The drying filter element according to claim 3, characterized in that, The first reinforcing rib (232) and the second reinforcing rib (221) are connected in sequence.

5. The drying filter element according to claim 3, characterized in that, The cover (21) is provided with a plurality of third reinforcing ribs (212) spaced apart in the circumferential direction. The third reinforcing ribs (212) extend radially along the cover (2), and the first air inlet (211) is provided between two adjacent third reinforcing ribs (212).

6. The drying filter element according to claim 3, characterized in that, The inner ring (22) is provided with a number of fourth air inlets, and the fourth air inlets are provided between two adjacent second reinforcing ribs (221).

7. The drying filter element according to any one of claims 1-6, characterized in that, The drying filter element also includes: A first baffle (4) is disposed in the drying chamber, and the first baffle (4) is located between the cover (21) and the desiccant (3); The second baffle (5) is disposed in the drying chamber and is located between the spring seat (23) and the desiccant (3); The third baffle (6) is disposed in the drying chamber. The third baffle (6) is located between the bottom wall of the inner cylinder (1) and the desiccant (3). The first baffle (4), the second baffle (5) and the third baffle (6) are made of non-woven fabric.

8. The drying filter element according to claim 7, characterized in that, Two third baffles (6) are provided, and the drying filter element further includes: Fine filter (7), which is located between the two third baffles (6), and the fine filter (7) is made of glass fiber.

9. The drying filter element according to claim 7, characterized in that, The drying filter element also includes a one-way valve assembly (8) and a paper core assembly (9). The inner cylinder (1) includes a first cylinder (11) and a second cylinder (12) connected in sequence. The outer diameter of the first cylinder (11) is larger than the outer diameter of the second cylinder (12). A first glue injection groove (111) is provided on the outer wall surface at the junction of the first cylinder (11) and the second cylinder (12). The one-way valve assembly (8) is provided with a second glue injection groove (811). One end of the paper core assembly (9) is located in the first glue injection groove (111), and the other end of the paper core assembly (9) is located in the second glue injection groove (811).

10. An air dryer, characterized in that, Includes an outer cylinder (001), a compression spring (002) located inside the outer cylinder (001), and a drying filter element as described in any one of claims 1-9, wherein one end of the compression spring (002) abuts against the top wall of the outer cylinder (001), and the other end of the compression spring (002) abuts against the spring seat (23) of the cylinder cover (2).

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