Compressed air filter

Abstract

The utility model provides a compressed air filter which comprises a shell, a filter cavity is formed in the shell, a liquid outlet communicated with the filter cavity penetrates through the bottom of the shell, a plurality of abutting edges distributed at intervals in the circumferential direction are arranged on the side wall of the lower portion of the filter cavity in a protruding mode, and the opposite sides of the abutting edges are sunken to form limiting grooves; the upper end cover and the lower end cover are arranged at the upper end and the lower end of the filter cylinder in a sealed mode respectively, the outer edge of the lower end cover protrudes downwards to form an abutting part and protrudes upwards to form a limiting part arranged on the outer side of the lower end of the filter cylinder in a sleeving mode, the filter cylinder is vertically arranged in the filter cavity, and the lower end of the filter cylinder is limited in the limiting grooves in an abutting mode through the abutting part. An insertion hole penetrates through the middle of the upper end cover; the top cover and the detachable sealing cover are arranged on the shell, an air inlet pipeline with the inner end portion being detachably inserted into the inserting hole in a sealed mode and an air outlet pipeline with the inner end portion communicating with the filter cavity are arranged on the side wall of the top cover in a penetrating mode, and a limiting ridge abutting against the top of the upper end cover is arranged on the inner side of the top cover in a downward protruding mode. The convenience of disassembling and assembling the filter element can be improved, and the filtering efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of filters, in particular to a compressed air filter. Background Art

[0002] Filters play a key role in compressed air drying and purification systems. They are mainly used to remove pollutants such as water, oil, solid particles, and microorganisms from compressed air. They are characterized by high efficiency, ease of use, and low operating costs.

[0003] The filter element in an existing filter consists of a filter cartridge and upper and lower end caps that fit over the cartridge's upper and lower ends. The upper end cap is typically connected to the filter's air inlet using screws, snap-fit ​​connections, or threaded connections to secure the entire filter element. However, these installation methods slow installation and replacement of the filter element, making assembly and disassembly difficult. This also requires extended downtime for the purification system during filter element replacement, reducing compressed air purification efficiency.

[0004] The purpose of this utility model is to design a compressed air filter to solve the problems existing in the above-mentioned prior art. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a compressed air filter, which can effectively solve the problems existing in the above-mentioned prior art.

[0006] The technical solution of the utility model is:

[0007] A compressed air filter comprising:

[0008] The outer shell has a filter cavity formed inside and a drain port connected to the filter cavity running through the bottom. The lower side wall of the filter cavity is convex with a plurality of circumferentially spaced abutting ribs, and the opposite sides of the plurality of abutting ribs are concave to form limiting grooves.

[0009] The filter element comprises a filter cartridge and an upper end cover and a lower end cover respectively sealed at the upper and lower ends of the filter cartridge, wherein the outer edge of the lower end cover is respectively convex downward to form an abutment portion and convex upward to form a limiting portion sleeved on the outer side of the lower end of the filter cartridge, the filter cartridge is vertically arranged in the filter cavity and the lower end is limited by the abutment portion and abutted in the plurality of limiting grooves, and a plug hole is penetrated in the middle of the upper end cover;

[0010] A top cover and a removable sealing cover are provided on the outer shell. The side wall of the top cover is penetrated by an air inlet duct with an inner end portion downwardly removably sealed and inserted into the plug hole and connected to the inner side of the filter cartridge, and an air outlet duct with an inner end portion connected to the filter cavity. The inner side of the top cover is protruding downward and is provided with a limiting ridge that abuts against the top of the upper end cover.

[0011] Further, the liquid outlet is arranged in the middle of the bottom of the shell, the inner bottom of the shell is arranged with a guide surface which is inclined downward from the outer periphery toward the liquid outlet, a plurality of guide ribs are arranged on the guide surface and extend toward the liquid outlet, the lower ends of the plurality of abutting ribs extend toward the liquid outlet to form guide portions, and the end portions of the guide portions are arranged with rounded corners.

[0012] Further, a guide boss is formed on the middle of the lower end cover and located in the inner bottom of the filter cartridge, the outer diameter of the guide boss gradually increases from top to bottom, the outer edge of the bottom of the guide boss is arranged with a gap from the inner wall of the filter cartridge, the bottom of the guide boss is recessed to form a groove, and a plurality of reinforcing ribs are arranged in the groove in a circumferential direction.

[0013] Further, the filter cartridge comprises an inner skeleton which is a cylinder and is arranged with a plurality of filter holes in the side wall, a plurality of flow guide baffles which are arranged on the outer wall of the inner skeleton in a circumferential direction, and a plurality of filter material blocks which are arranged between the outer wall of the inner skeleton and the plurality of flow guide baffles, the flow guide baffles are arranged in a clockwise spiral from top to bottom, the lower end of one flow guide baffle corresponds to the upper end of the next flow guide baffle, the clockwise side of the flow guide baffle forms a flow guide surface which corresponds to the vertical projection of the corresponding filter material block, the number of the limiting portions is a plurality and the limiting portions are arranged on the outer edge of the lower end cover in a ring shape, the limiting grooves are formed between adjacent limiting portions and have a groove bottom which is flush with the lower end of the filter material block and corresponds to the clockwise side of the flow guide baffle, and the flow guide surface is used for receiving the liquid filtered by the filter material block and spirally guiding the liquid downward to the flow guide groove.

[0014] Further, the middle of the flow guide groove corresponds to the lower end of the corresponding flow guide baffle, one side of the flow guide groove corresponds to the upper half of the corresponding filter material block, and the other side of the flow guide groove corresponds to the lower half of the next filter material block.

[0015] Further, the outer side of the plurality of limiting portions is protruded to form reinforcing portions, and the gap between the side wall of the limiting groove and the outer wall of the abutting portion is greater than the width of the reinforcing portion.

[0016] Further, the outer edge of the upper end cover is folded downward to be sleeved on the outer side of the upper end of the filter cartridge, the inner wall of the insertion hole is recessed to form at least two sealing grooves, a sealing ring is arranged in each of the two sealing grooves, and the inner end portion of the air inlet pipeline is inserted into the insertion hole to press the sealing ring to be arranged in a sealed manner.

[0017] Therefore, the utility model provides the following effects and / or advantages:

[0018] 1. The limiting grooves of several abutting ribs in the filter chamber provide limiting, the abutting portion and limiting portion of the lower end cover strengthen the outer edge structural strength, and the insertion hole of the upper end cover provides positioning, so that the filter element is directly inserted vertically into the filter chamber and the lower end is limited by the abutting portion and abutted in several limiting grooves. After that, the inner end of the air intake pipe of the top cover is aligned with the insertion hole and sealed with the shell, so that the inner end of the air intake pipe is sealed and inserted in the insertion hole, and the limiting rib abuts against the top of the upper end cover, the filter element can be installed, which greatly improves the convenience of installation and removal of the filter element. The filter element is convenient to install and disassemble, which saves effort and shortens the downtime of the purification system when replacing the filter element, thus improving the compressed air purification efficiency. At the same time, the filter element is vertically limited by the limiting ribs and the bottom of the limiting groove, and the filter element is horizontally limited by the inner end of the air inlet pipe and the side wall of the limiting groove, which can avoid the filter element being shaken by force when it is placed in the filter cavity for compressed air filtration, resulting in loose sealing connections between structures and air leakage, thereby improving the working stability of the filter element after installation and extending its service life while facilitating the installation and disassembly of the filter element.

[0019] 2. The provision of a plurality of guide portions can directly guide the oil and water flowing down along a plurality of abutting ribs to the drain port; the provision of a plurality of guide ribs can directly guide the oil and water falling onto the guide surface to the drain port, thereby guiding the falling oil and water through the staggered distribution of a plurality of guide portions and guide ribs, reducing the tendency of the oil and water to flow horizontally on the guide surface, improving the efficiency of the oil and water flowing to the drain port, and improving the drainage rate and effect of the filter chamber.

[0020] 3. The setting of the guide boss reduces the area where oil and water can accumulate at the bottom of the filter element, and the outer wall of the guide boss guides the oil and water in the filter cartridge outward, thereby improving the outward discharge efficiency of the oil and water in the filter cartridge, avoiding excessive accumulation of oil and water inside the filter cartridge, resulting in the formation of an oil film on the inner wall of the lower end of the filter cartridge and affecting the filtering effect. At the same time, the setting of several reinforcing ribs improves the overall structural strength of the lower end cover, reducing the risk of the lower end cover bending when the filter element is working.

[0021] 4. By adding a number of guide baffles, the oil and water filtered out by the corresponding filter material block and flowing downward can be completely received by the guide surface and then spirally guided to the guide groove for discharge, thereby concentrating the oil and water on the guide surface and guiding them to spirally flush the guide surface continuously, thereby avoiding the accumulation of oil and water at the bottom of the filter material block to form an oil film. In addition, under the premise of strengthening the structural strength of the outer edge of the lower end cover together with the abutment part through a number of limiting parts sleeved on the outside of the lower end of the filter cartridge, the discharge efficiency of oil and water is improved, and the accumulation of oil and water at the lower end of the filter cartridge to form an oil film and affect the filtering effect is avoided, thereby extending the service life of the filter cartridge as a whole.

[0022] 5. The middle of the guide groove corresponds to the lower end of the corresponding guide baffle, one side of the guide groove corresponds to the upper half of the corresponding filter material block, and the other side corresponds to the lower half of the filter material block of the previous level. This allows the oil and water guided by the guide surface to flow out through the guide groove from the clockwise side of the guide baffle. The oil and water filtered from the lower ends of several filter material blocks near the side of the next-level guide baffle can also flow out directly through the guide groove, reducing the blocking area of ​​the oil and water discharge by the limiter, thereby improving the discharge efficiency of the oil and water filtered from the lower ends of several filter material blocks near the side of the next-level guide baffle.

[0023] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the structure of a compressed air filter.

[0025] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure.

[0026] Figure 3 for Figure 2 A local enlarged schematic diagram of point A in the middle.

[0027] Figure 4 This is a schematic diagram of the top cover structure when viewed from above.

[0028] Figure 5 Schematic diagram of the filter element structure.

[0029] Figure 6 Schematic diagram of the structure of the guide baffle. DETAILED DESCRIPTION

[0030] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the following embodiments and accompanying drawings:

[0031] refer to Figure 1-6 , a compressed air filter, comprising:

[0032] The housing 1 has a filter cavity 11 formed therein and a drain port 12 extending through the bottom thereof and communicating with the filter cavity 11. The lower sidewall of the filter cavity 11 is provided with a plurality of circumferentially spaced abutment ribs 13 protruding therefrom. Opposite sides of the plurality of abutment ribs 13 are recessed to form retaining grooves 14. Specifically, the drain port 12 is configured to connect to an external drain.

[0033] The filter element 2 includes a filter cartridge 21 and an upper end cover 22 and a lower end cover 23 respectively sealed at the upper and lower ends of the filter cartridge 21. The outer edge of the lower end cover 23 is respectively raised downward to form an abutment portion 231 and raised upward to form a limiting portion 232 sleeved on the outer side of the lower end of the filter cartridge 21. The filter cartridge 21 is vertically arranged in the filter cavity 11 and the lower end is limited by the abutment portion 231 and abutted in the plurality of limiting grooves 14. The middle of the upper end cover 22 is penetrated by an insertion hole 221;

[0034] The top cover 3, a detachable sealing cover is provided on the outer shell 1, and the side wall of the top cover 3 is penetrated by an air inlet pipe 31 whose inner end is downwardly detachably sealed and inserted into the plug hole 221 and connected to the inner side of the filter cartridge 21, and an air outlet pipe 32 whose inner end is connected to the filter chamber 11. The inner side of the top cover 3 is protruding downward and is provided with a limiting rib 33 that is abutted against the top of the upper end cover 22.

[0035] Specifically, the filter material of the filter cartridge 21 is made of glass fiber. When the compressed air to be processed enters the filter cartridge 21 through the air inlet pipe 31, the flow rate slows down, and large droplets fall down under the action of gravity. Some droplets and solid particles are directly intercepted when passing through the filter cartridge 21. When droplets and solid particles with smaller diameters pass through the filter cartridge 21 with the gas, they are captured by the filter cartridge 21 due to inertial collision and gradually condense into larger droplets and flow downward. When smaller solid and droplet particles approach the filter cartridge 21 through Brownian motion, they are affected by the electrostatic attraction of the glass fiber and are adsorbed on the filter cartridge 21. The droplets filtered out by the filter cartridge 21 flow down along the filter cartridge 21 and fall to the bottom of the filter chamber 11 and are discharged through the drain outlet. The droplets are mainly oil and water.

[0036] The above structure is set up, and the limiting grooves 14 of several abutting ribs 13 in the filter chamber 11 provide limiting, the abutting portion 231 and the limiting portion 232 of the lower end cover 23 strengthen the structural strength of the outer edge, and the insertion hole 221 of the upper end cover 22 provides positioning, so that the filter element 2 is directly inserted vertically into the filter chamber 11 and the lower end is limited by the abutting portion 231 and abutted in several of the limiting grooves 14. After the inner end of the air inlet pipe 31 of the top cover 3 is aligned with the insertion hole 221, it is sealed with the shell 1, so that the inner end of the air inlet pipe 31 is sealed and inserted in the insertion hole 221, and the limiting rib 33 is abutted against the top of the upper end cover 22, so that the filter element 2 of the filter can be installed. The filter element 2 is installed in a convenient manner, which greatly improves the convenience of installation and disassembly of the filter element 2. The filter element 2 is labor-saving to install and disassemble, shortens the downtime of the purification system when replacing the filter element 2, and improves the compressed air purification efficiency. At the same time, the filter element 2 is vertically limited by the limiting ribs 33 and the bottom of the limiting groove 14, and the filter element 2 is laterally limited by the inner end of the air inlet pipe 31 and the side wall of the limiting groove 14. This can prevent the filter element 2 from being shaken by force when it is placed in the filter chamber 11 for compressed air filtering, resulting in loosening of the sealing connection between the structures and air leakage, thereby improving the stability of the filter element 2 after installation and extending its service life while facilitating the disassembly of the filter element 2.

[0037] In order to improve the drainage rate and effect of the filter chamber 11, the drainage port 12 is provided in the middle of the bottom of the shell 1, and a guide surface 15 is provided on the inner bottom of the shell 1, which is inclined downward from the outer periphery toward the drainage port 12. A plurality of guide ribs 16 extending toward the drainage port 12 are raised on the guide surface 15, and the lower ends of the plurality of abutting ribs 13 extend toward the drainage port 12 to form a guide portion 131. The end of the guide portion 131 is rounded to improve the smoothness of the passage of oil and water. The plurality of guide ribs 16 and the plurality of abutting ribs 13 are staggered and arranged at circumferential intervals. By providing a plurality of guide portions 131, the oil and water flowing down along the plurality of abutting ribs 13 can be directly guided to the drain port 12. By providing a plurality of guide ribs 16, the oil and water falling onto the guide surface 15 can be directly guided to the drain port 12. Thus, the staggered distribution of the plurality of guide portions 131 and guide ribs 16 guides the falling oil and water, reduces the tendency of the oil and water to flow laterally on the guide surface 15, improves the efficiency of the oil and water flowing to the drain port 12, and improves the drainage rate and effect of the filter chamber 11.

[0038] To improve the efficiency of draining oil and water from the filter cartridge 21, the center portion of the lower end cap 23 is convexly formed to form a guide boss 233 located at the bottom of the filter cartridge 21. The outer diameter of the guide boss 233 gradually increases from top to bottom, and a gap is provided between the outer edge of the bottom of the guide boss 233 and the inner wall of the filter cartridge 21. The bottom of the guide boss 233 is recessed to form a groove, within which a plurality of reinforcing ribs 234 are fixedly positioned at circumferential intervals. The provision of the guide boss 233 reduces the area within the bottom of the filter element 2 where oil and water can accumulate. The outer wall of the guide boss 233 guides the oil and water in the filter cartridge 21 outwardly, thereby improving the efficiency of draining oil and water from the filter cartridge 21 and preventing excessive accumulation of oil and water within the filter cartridge 21, which could result in the formation of an oil film on the inner wall of the lower end of the filter cartridge 21 and affect the filtration effect. Furthermore, the provision of the plurality of reinforcing ribs 234 enhances the overall structural strength of the lower end cap 23, reducing the risk of the lower end cap 233 bending during operation of the filter element 2.

[0039] As the filtration proceeds, the oil and water in and around the lower end of the filter cartridge 21 need to accumulate to a height higher than the limit portion 232 before they can fall to the bottom of the filter chamber 11, which will cause the oil and water to accumulate at the lower end of the filter cartridge 21 for a long time, forming an oil film and clogging the filter cartridge 21, thereby affecting the filtration effect of the lower end of the filter cartridge 21. At the same time, the oil and water in the filter cartridge 21 continue to flow downward and accumulate at the lower part of the filter cartridge 21, which will also form an oil film at the lower part of the filter cartridge 21, causing the lower part of the filter cartridge 21 to be blocked, thereby affecting the filtration effect of the lower part of the filter cartridge 21, resulting in a significant reduction in the filtration efficiency of the filter cartridge 21 for compressed air.

[0040] Therefore, in order to avoid the formation of an oil film after the accumulation of oil and water at the lower end and lower part of the filter cartridge 21, the filter cartridge 21 includes a cylindrical inner skeleton 211 with a plurality of filter holes passing through the side wall, a plurality of guide baffles 212 fixedly arranged on the outer wall of the inner skeleton 211 at intervals in a clockwise direction, and a plurality of filter material blocks 213 fixedly arranged between the outer wall of the inner skeleton 211 and the plurality of guide baffles 212. The guide baffles 212 are arranged in a clockwise spiral from top to bottom, and the lower end of the guide baffle 212 corresponds to the upper end of the guide baffle 212 of the next level. A guide surface 2121 corresponding to the vertical projection of the corresponding filter material block 213 is formed on the clockwise side of the guide baffle 212. The number of the limiting portions 232 is set to several and is annularly spaced on the outer edge of the lower end cover 23. A guide groove 235 is formed between adjacent limiting portions 232, the bottom of which is flush with the lower end of the filter material block 213 and corresponds to the clockwise side of the guide baffle 212; the guide surface 2121 is used to receive the liquid filtered by the filter material block 213 and spirally guide it downward to the guide groove 235 for discharge. Therefore, by adding a number of guide baffles 212, the oil and water filtered out of the corresponding filter material block 213 and flowing downward can be completely received by the guide surface 2121 and then spirally guided downward to the guide groove 235 for discharge, thereby achieving the effect of concentrating the oil and water on the guide surface 2121 and guiding it to spirally scour the guide surface 2121 continuously, thereby avoiding the accumulation of oil and water at the lower part of the filter material block 213 to form an oil film, and achieving the premise of strengthening the structural strength of the outer edge of the lower end cover 23 together with the abutment part 231 by a number of limiting parts 232 being limitedly sleeved on the outer side of the lower end of the filter cartridge 21, thereby improving the discharge efficiency of oil and water, avoiding the accumulation of oil and water at the lower end of the filter cartridge 21 to form an oil film and affecting the filtering effect, thereby extending the overall service life of the filter cartridge 21.

[0041] In order to improve the drainage efficiency of oil and water filtered from the lower ends of several filter blocks 213 near the next-stage guide baffle 212, the middle portion of the guide groove 235 corresponds to the lower end of the corresponding guide baffle 212, one side of the guide groove 235 corresponds to the upper half of the corresponding filter block 213, and the other side corresponds to the lower half of the filter block 213 of the previous stage. This allows the oil and water guided by the guide surface 2121 to flow out from the clockwise side of the guide baffle 212 through the guide groove 235. Furthermore, the oil and water filtered from the lower ends of several filter blocks 213 near the next-stage guide baffle 212 can also flow out directly through the guide groove 235, reducing the blocking area of ​​the limiter 232 on the oil and water discharge, thereby improving the drainage efficiency of the oil and water filtered from the lower ends of several filter blocks 213 near the next-stage guide baffle 212.

[0042] In order to improve the oil-water discharge efficiency by setting the flow guide groove 235, and further strengthen the structural strength of the limiting portion 232, the outer side of the limiting portion 232 is protruded to form a reinforcing portion 2321, and the gap between the side wall of the limiting groove 14 and the outer wall of the abutting portion 231 is greater than the width of the reinforcing portion 2321.

[0043] In order to improve the sealing strength of the air inlet pipe 31 and the insertion hole 221, the outer edge of the upper end cover 22 is folded downward to cover the outer side of the upper end of the filter cartridge 21, the inner wall of the insertion hole 221 is recessed to form at least two sealing grooves 222, the sealing grooves 222 are provided with sealing rings 223, and the inner end of the air inlet pipe 31 is inserted into the insertion hole 221 to press the sealing rings 223. Thus, the inner end of the air inlet pipe is sealed by the at least two sealing rings 223, and the multi-stage sealing between the inner end of the air inlet pipe and the insertion hole 221 is realized, and the sealing strength is improved.

[0044] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A compressed air filter, characterized in that: include: The housing (1) has a filter cavity (11) formed therein, and a drain port (12) connected to the filter cavity (11) is formed through the bottom thereof. The lower side wall of the filter cavity (11) is provided with a plurality of circumferentially spaced abutting ridges (13) protruding therefrom, and the opposite sides of the plurality of abutting ridges (13) are recessed to form limiting grooves (14). The filter element (2) comprises a filter cartridge (21) and an upper end cover (22) and a lower end cover (23) respectively sealed at the upper and lower ends of the filter cartridge (21); the outer edge of the lower end cover (23) is respectively convex downward to form an abutment portion (231) and convex upward to form a limiting portion (232) sleeved on the outer side of the lower end of the filter cartridge (21); the filter cartridge (21) is vertically arranged in the filter cavity (11) and the lower end is limited and abutted in the plurality of limiting grooves (14) through the abutment portion (231); and a plug hole (221) is provided through the middle of the upper end cover (22); A top cover (3) and a detachable sealing cover are provided on the housing (1); a side wall of the top cover (3) is provided with an air inlet pipe (31) with an inner end downwardly detachably sealed and inserted into the insertion hole (221) and connected to the inner side of the filter cartridge (21); and an air outlet pipe (32) with an inner end connected to the filter chamber (11); the inner side of the top cover (3) is convex downwardly and provided with a limiting rib (33) that abuts against the top of the upper end cover (22).

2. A compressed air filter according to claim 1, characterized in that: The liquid discharge port (12) is provided at the middle of the bottom of the shell (1); a guide surface (15) is provided on the inner bottom of the shell (1) and is inclined downward from the outer circumference toward the liquid discharge port (12); a plurality of guide ribs (16) extending toward the liquid discharge port (12) are provided on the guide surface (15); the lower ends of the plurality of abutting ribs (13) extend toward the liquid discharge port (12) to form a guide portion (131); the end of the guide portion (131) is provided with a rounded corner; the plurality of guide ribs (16) and the plurality of abutting ribs (13) are arranged circumferentially and staggered.

3. A compressed air filter according to claim 1, characterized in that: The middle portion of the lower end cover (23) is convex to form a guide boss (233) located at the bottom of the filter cartridge (21). The outer diameter of the guide boss (233) gradually increases from top to bottom. A gap is set between the outer edge of the bottom of the guide boss (233) and the inner wall of the filter cartridge (21). The bottom of the guide boss (233) is concave to form a groove. A plurality of reinforcing ribs (234) are fixedly provided at intervals in the circumferential direction of the groove.

4. A compressed air filter according to claim 1, characterized in that: The filter cartridge (21) comprises an inner frame (211) of cylindrical shape with a plurality of filter holes passing through the side wall, a plurality of flow guide baffles (212) fixedly arranged on the outer wall of the inner frame (211) at intervals in a clockwise direction, and a plurality of filter material blocks (213) fixedly arranged between the outer wall of the inner frame (211) and the plurality of flow guide baffles (212), wherein the flow guide baffles (212) are arranged in a clockwise spiral from top to bottom, the lower end of one flow guide baffle (212) corresponds to the upper end of the next level flow guide baffle (212), and the clockwise side of the flow guide baffle (212) is A guide surface (2121) is formed corresponding to the vertical projection of the corresponding filter material block (213); the number of the limiting portions (232) is set to be several and annularly spaced on the outer edge of the lower end cover (23); a guide groove (235) is formed between adjacent limiting portions (232), the groove bottom of which is flush with the lower end of the filter material block (213) and corresponds to the clockwise side of the guide partition (212); the guide surface (2121) is used to receive the liquid filtered by the filter material block (213) and spirally guide it downward to the guide groove (235) for discharge.

5. A compressed air filter according to claim 4, characterized in that: The middle portion of the guide groove (235) corresponds to the lower end of the corresponding guide baffle (212), one side of the guide groove (235) corresponds to the upper half of the corresponding filter material block (213), and the other side corresponds to the lower half of the filter material block (213) of the previous level.

6. A compressed air filter according to claim 1, characterized in that: The outer sides of the plurality of limiting portions (232) protrude to form a reinforcing portion (2321), and the gap between the side wall of the limiting groove (14) and the outer wall of the abutting portion (231) is greater than the width of the reinforcing portion (2321).

7. A compressed air filter according to claim 1, characterized in that: The outer edge of the upper end cover (22) is folded downward and sleeved on the outer side of the upper end of the filter cartridge (21); the inner wall of the insertion hole (221) is recessed and provided with at least two sealing grooves (222); a sealing ring (223) is provided in each of the two sealing grooves (222); the inner end of the air intake pipe (31) is inserted into the insertion hole (221) and squeezes the sealing ring (223) to form a sealing arrangement.

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