Compressed air filter

Abstract

The invention discloses a compressed air filter, which relates to the technical field of air purification and comprises a filter bracket, a centrifuge, a filter, a water collecting container, an air inlet and an air outlet, the centrifuge comprises a centrifugal rotating track, a rotating ring and a fixed sleeve; the multiple centrifugal rotating rails are fixed to the middle of the filter from top to bottom at intervals in the vertical direction, and the whole centrifugal rotating rails are arranged in a spiral mode; the rotating ring is fixed in the centrifuge and is perpendicular to the centrifugal rotating track; the fixed sleeve is fixed in the middle of the filter and located on the outer sides of the centrifugal rotating track and the rotating ring, the rotating ring is slidably connected to the inner wall of the fixed sleeve, and the fixed sleeve is used for containing the rotating ring and isolating the centrifugal rotating track from the filter; the technical effects that water remaining on the side wall can be prevented from being taken away by gas filtered by the centrifuge for the second time, secondary mixing of the gas is avoided, the water filtering effect is improved, filter bag pollution is reduced, and the equipment performance is improved can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of air purification, and in particular to a compressed air filter. Background Art

[0002] A compressed air filter is a device used to clean and filter the air entering from a compressed air system to ensure that the compressed air quality meets specific requirements. Compressed air filters usually include multiple filter layers, each with a different function to ensure that impurities, moisture, grease and other contaminants are removed from the air produced by the compressor.

[0003] Regarding air compression and filtration, a Chinese invention patent with patent number CN108392934B discloses a compressed air filter, including a centrifuge, a filter covered on the outside of the centrifuge and a liquid collecting container connected to the bottom of the centrifuge, wherein a centrifugal rotating track is arranged inside the centrifuge; the patent prolongs the centrifugal action time of the compressed air by arranging the centrifugal rotating track, and improves the separation effect of the compressed air from impurities such as water and oil; the filter with an inverted U-shaped longitudinal section increases the filtration path of the compressed air and improves the filtration efficiency of the compressed air; at the same time, the top-in and bottom-out form is adopted, and the purification effect and quality of the compressed air are improved through two-stage purification of centrifugal rotation and adsorption filtration.

[0004] Although the above scheme improves the air purification effect to a certain extent during the process of compressing and filtering the air, in actual use, the airflow in the medium flow rate range will carry away the water flow that has been condensed on the side wall of the centrifugal rotating track after centrifugal separation during the process of rotating through the centrifugal rotating track, so that the gas mixed with the water flow will be mixed with the gas filtered inside it after entering the inverted U-shaped filter, resulting in the airflow filtered by the centrifuge to form a secondary mixture after passing through the same pipeline, which reduces the water and impurity filtering effect; at the same time, the gas treated by the filter will pass through the dust collector filter bag for secondary impurity removal. If the moisture content in the gas is too high, a large amount of liquid water will accumulate on the surface of the filter bag during the dust removal process through the dust collector filter bag, making it easy for dust to condense and adsorb on the surface of the filter bag, resulting in increased pollution of the filter bag and a decrease in equipment performance. Summary of the invention

[0005] The present application provides a compressed air filter to solve the technical problem in the prior art that it is impossible to avoid the gas after centrifuge filtration carrying away the residual moisture on the side wall and remixing with the previously filtered gas, thereby reducing the moisture filtration effect, causing increased contamination of the filter bag and reducing the performance of the equipment. The application achieves the technical effect of preventing the moisture remaining on the side wall from being carried away again by the gas after centrifuge filtration, avoiding secondary mixing of the gas, improving the moisture filtration effect, reducing the contamination of the filter bag and improving the performance of the equipment.

[0006] The present application provides a compressed air filter, comprising a filter support, a centrifuge, a filter for filtering and purifying compressed air, a water collection container for collecting water separated by centrifugal action, an air inlet and an air outlet;

[0007] The centrifuge comprises a centrifugal rotating track, a rotating ring and a fixed sleeve;

[0008] The centrifugal rotating tracks are provided in plurality, and are fixed at intervals in the middle of the filter from top to bottom in the vertical direction. The centrifugal rotating tracks are arranged in a spiral shape as a whole, so as to prolong the centrifugal action time of the compressed air;

[0009] The rotating ring is fixed inside the centrifuge and placed vertically with the centrifugal rotating track, and is used to filter and collect the water remaining on the side wall of the centrifugal rotating track;

[0010] The fixed sleeve is fixed in the middle of the filter and is located outside the centrifugal rotating track and the rotating ring. The rotating ring is slidably connected to the inner wall of the fixed sleeve. The fixed sleeve is used to place the rotating ring and isolate the centrifugal rotating track and the filter.

[0011] Furthermore, three rotating rings are provided, and all are slidably connected to the inner wall of the fixed sleeve in sequence from top to bottom along the vertical direction; a rotating ring is detachably fixed between two adjacent centrifugal rotating tracks.

[0012] Furthermore, the rotating ring has two layers, namely an inner ring and an outer ring;

[0013] The inner ring is fixed inside the centrifugal rotating track, and is connected to the outer ring through ball sliding, and a screen is fixed on its upper end to filter impurities in the airflow and separated water;

[0014] The outer ring is fixed on the outside of the centrifugal rotating track and is slidably connected to the inside of the fixed sleeve, and is used to cooperate with the inner ring to collect and remove the filtered water.

[0015] Furthermore, a groove is provided on a side of the outer ring opposite to the inner ring, and an annular sponge is fixed inside the groove to absorb moisture remaining on the side wall of the centrifugal rotating track.

[0016] Furthermore, a plurality of guide plates are evenly arranged on the outer side surface of the inner ring along its circumference and from top to bottom. The guide plates are placed tilted downward and their free ends extend into the interior of the annular sponge.

[0017] Furthermore, a guiding inclined surface is provided on a side of the outer ring close to the centrifugal rotating track.

[0018] Furthermore, a plastic shell is provided on the outer side of the annular sponge, the cross-section of the plastic shell in the vertical direction is a U-shaped structure and a hydrophobic hole is provided on its bottom surface, the plastic shell and the groove in the outer ring form a closed negative pressure cavity, and the negative pressure cavity and the plastic shell cooperate with each other to squeeze the annular sponge to achieve the water removal effect.

[0019] Furthermore, a side of the plastic package shell facing the negative pressure chamber is a flexible elastic layer, and a plurality of magnetic blocks are evenly arranged on the outer side of the elastic layer along its circumference.

[0020] Furthermore, two groups of electromagnets cooperating with the magnetic block are fixed on the inner wall of the fixed sleeve opposite to the elastic layer. The two groups of electromagnets are arranged up and down, and two adjacent electromagnets are arranged alternately up and down, so as to control the deformation size and stretching degree of the elastic layer, thereby controlling the water removal effect of the annular sponge.

[0021] Furthermore, a water flow groove corresponding to the drain hole is provided on the upper surface of one end of the fixed sleeve below the rotating ring; a water pipe is vertically fixed inside the side wall of the fixed sleeve, and the lower end of the water pipe is connected to the water collecting container. Multiple water flow grooves are connected by the water pipe, which is used to flow the separated water into the water collecting container through the water flow grooves and the water pipe to be collected.

[0022] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0023] By optimizing and improving the centrifuge structure in the prior art, a plurality of rotating rings are arranged in the centrifugal rotating track to filter and collect the residual moisture on the side wall. The rotating rings can rotate synchronously with the incoming airflow in the centrifugal rotating track, and can effectively intercept most of the moisture and larger impurities. The technical problem in the prior art that it is impossible to avoid the gas filtered by the centrifuge taking away the residual moisture on the side wall and remixing with the previously filtered gas, reducing the moisture filtration effect, causing the pollution of the filter bag to increase and reducing the performance of the equipment is effectively solved. The technical effect of avoiding the moisture remaining on the side wall from being taken away again by the gas filtered by the centrifuge, avoiding secondary mixing of the gas, improving the moisture filtration effect, reducing the pollution of the filter bag and improving the performance of the equipment is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the overall three-dimensional structure of a compressed air filter of the present invention.

[0025] Figure 2 The figure is a full cross-sectional view of a compressed air filter according to the present invention.

[0026] Figure 3 The present invention is a three-dimensional structural cross-sectional view of a centrifuge of a compressed air filter.

[0027] Figure 4 The figure is a schematic diagram of the three-dimensional structure of a rotating ring of a compressed air filter according to the present invention.

[0028] Figure 5 The present invention is a three-dimensional cross-sectional view of a rotating ring of a compressed air filter.

[0029] Figure 6 The present invention is a full cross-sectional view of a rotating ring of a compressed air filter.

[0030] Figure 7 The present invention is a three-dimensional structural schematic diagram of an inner layer and a plastic shell of a compressed air filter.

[0031] Figure 8 The present invention is a partial three-dimensional structural schematic diagram of a fixed sleeve and a plastic package shell of a compressed air filter.

[0032] Fig. 9 It is a partial three-dimensional structural schematic diagram of a fixed sleeve of a compressed air filter of the present invention.

[0033] Fig.10 The present invention is a partial full-section view of a fixing sleeve of a compressed air filter.

[0034] In the figure: 100, filter bracket; 200, centrifuge; 210, centrifugal rotating track; 220, rotating ring; 221, inner ring; 222, outer ring; 223, guide plate; 230, fixed sleeve; 231, electromagnetic block; 232, water flow trough; 233, water guide pipe; 240, screen; 250, groove; 260, annular sponge; 261, plastic shell; 262, elastic layer; 263, magnetic block; 300, filter; 400, water collection container; 500, air inlet; 600, air outlet. DETAILED DESCRIPTION

[0035] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0036] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0038] See also Figure 3 , which is a three-dimensional structural cross-sectional view of a centrifuge of a compressed air filter of the present invention; the present application optimizes and improves the structure of the centrifuge 200 in the prior art, and filters and collects the residual moisture on the side wall by arranging multiple rotating rings 220 in the centrifugal rotating track 210. The rotating rings 220 can rotate synchronously with the incoming air flow in the centrifugal rotating track 210, and can effectively intercept most of the moisture and larger impurities, effectively solving the technical problem in the prior art that it is impossible to avoid the gas filtered by the centrifuge 200 taking away the residual moisture on the side wall and remixing with the previously filtered gas, reducing the moisture filtration effect, causing the pollution of the filter bag to increase and reducing the performance of the equipment, and achieving the technical effect of avoiding the moisture remaining on the side wall from being taken away by the gas filtered by the centrifuge 200 for the second time, avoiding the secondary mixing of the gas, improving the moisture filtration effect, reducing the pollution of the filter bag and improving the performance of the equipment.

[0039] Embodiment 1: Figure 1-Figure 3 As shown, the present application is a compressed air filter, comprising a filter support 100, a centrifuge 200, a filter 300 for filtering and purifying compressed air, a water collection container 400 for collecting water separated by centrifugation, an air inlet 500 and an air outlet 600;

[0040] The centrifuge 200 includes a centrifugal rotating track 210, a rotating ring 220 and a fixed sleeve 230;

[0041] The centrifugal rotating tracks 210 are provided in plurality, and are fixed at intervals in the middle of the filter 300 from top to bottom in the vertical direction. The centrifugal rotating tracks 210 are arranged in a spiral shape as a whole, so as to prolong the centrifugal action time of the compressed air.

[0042] The rotating ring 220 is fixed inside the centrifuge 200 and is placed vertically with the centrifugal rotating track 210, and is used to filter and collect the water remaining on the side wall of the centrifugal rotating track 210;

[0043] The fixed sleeve 230 is fixed in the middle of the filter 300 and is located outside the centrifugal rotating track 210 and the rotating ring 220. The rotating ring 220 is slidably connected to the inner wall of the fixed sleeve 230. The fixed sleeve 230 is used to place the rotating ring 220 and isolate the centrifugal rotating track 210 and the filter 300.

[0044] There are three rotating rings 220, which are slidably connected to the inner wall of the fixed sleeve 230 in sequence from top to bottom along the vertical direction; a rotating ring 220 is detachably fixed between two adjacent centrifugal rotating tracks 210; the centrifugal rotating tracks 210 and the rotating ring 220 are fixed at their joints by snap-fitting and using sealing rings to prevent air leakage and poor filtering effect.

[0045] A rotating ring 220 is added in the centrifugal rotating track 210. The rotating ring 220 can rotate synchronously with the airflow, collect the moisture remaining on the inner wall through the rotating ring 220, and take away the collected moisture through the rotation of the rotating ring 220, so as to separate the air path and the moisture, avoid the moisture on the side wall from being taken away by the gas entering for the second time, and effectively intercept a large amount of moisture and impurities.

[0046] The rotating ring 220 can separate moisture from the air more effectively through its rotating motion. Compared with static dehumidification, this dynamic dehumidification method can more fully contact the air, thereby increasing the efficiency and effect of dehumidification. Its rotation process may also produce a certain centrifugal effect on the tiny particles and pollutants in the air, thereby improving and extending the service life of the filter 300 to a certain extent, reducing the amount of liquid water brought into the dust collector filter bag, reducing dust condensation and adsorption on the surface of the filter bag, reducing filter bag pollution, and improving equipment performance and centrifugal separation effect.

[0047] During actual operation of the embodiment of the present application, the steps are as follows: first, compressed air is introduced into the centrifuge 200 through the air inlet 500. The compressed air performs centrifugal motion along the centrifugal rotating track 210 under the action of gravity and power. The rotating ring 220 rotates synchronously with the airflow, and the moisture remaining on the inner wall is collected by the rotating ring 220 and the collected moisture is taken away by the rotation of the rotating ring 220, so that a part of the water and other impurities in the compressed air flow through the fixed sleeve 230 into the water collecting container 400 under the action of the centrifugal rotating track 210 and the rotating ring 220, and are discharged through the outlet of the water collecting container 400. The compressed air filtered by centrifugal action enters the filter 300 through one side of the bottom end of the filter 300, and flows upward, rightward and downward along the U-shaped direction. After flowing through the entire filter 300, it is fully adsorbed, filtered and dried by the silica gel particles and is discharged from the filter 300 through the air outlet 600 at the bottom end of the filter 300, thereby completing the filtration and purification.

[0048] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0049] The present invention effectively solves the technical problem in the prior art that the gas filtered by the centrifuge 200 cannot prevent the residual moisture on the side wall from being taken away by the gas filtered by the centrifuge 200 and remixing with the previously filtered gas, thereby reducing the moisture filtration effect, causing increased contamination of the filter bag and reducing the performance of the equipment. The present invention achieves the technical effect of preventing the moisture remaining on the side wall from being taken away again by the gas filtered by the centrifuge 200, avoiding secondary mixing of the gas, improving the moisture filtration effect, reducing the contamination of the filter bag and improving the performance of the equipment.

[0050] Embodiment 2: In order to improve the actual water filtration effect of separating water by centrifugal action, so as to improve the filtration and purification efficiency of the device, the present application proposes the following technical solutions for the above technical problems, specifically:

[0051] like Figure 4-Figure 6 As shown, the rotating ring 220 has two layers, namely an inner ring 221 and an outer ring 222;

[0052] The inner ring 221 is fixed inside the centrifugal rotating track 210, and is connected to the outer ring 222 by ball sliding, and a screen 240 is fixed on its upper end to filter impurities in the airflow and separated water;

[0053] The outer ring 222 is fixed to the outside of the centrifugal rotating track 210 and is slidably connected to the inside of the fixed sleeve 230, and is used to cooperate with the inner ring 221 to collect and remove the filtered water.

[0054] A groove 250 is formed on a surface of the outer ring 222 opposite to the inner ring 221 . An annular sponge 260 is fixed inside the groove 250 to absorb moisture remaining on the side wall of the centrifugal rotating track 210 .

[0055] The outer side surface of the inner ring 221 is evenly provided with a plurality of guide plates 223 along the circumference and from top to bottom. The guide plates 223 are tilted downward and the free ends thereof extend into the interior of the annular sponge 260 .

[0056] Furthermore, in order to ensure that the water hanging on the side wall of the centrifugal rotating track 210 can be quickly filtered out from the rotating ring 220, as shown in FIG. Figure 5 As shown, a guiding slope is provided on one side of the outer ring 222 close to the centrifugal rotating track 210 .

[0057] The structure of the rotating ring 220 is changed from a single-layer ring to a double-layer ring, and a gap is left between the inner ring 221 and the outer ring 222 to enable it to rotate. At the same time, a plurality of guide plates 223 are arranged between the inner ring 221 and the outer ring 222, and the other end of the guide plate 223 is inserted into the annular sponge 260 in the outer ring 222 to achieve the effect of guiding and absorbing water.

[0058] During actual use, the moisture remaining or filtered out on the side wall flows to the drain plate 223 through the guide slope, and then flows to the annular sponge 260 under the action of the drain plate 223, and is finally absorbed by the annular sponge 260. The drain plate 223 can increase the flow path length of the water flow, so that the water is subjected to more centrifugal force during the flow process, thereby being more easily separated and discharged; the drain plate 223 can also increase the turbulence of the water flow to a certain extent, which helps to further break up and disperse the water droplets and improve the water removal efficiency.

[0059] Embodiment 3: In order to further improve the absorption and drainage effects of the annular sponge 260 and improve the filtration and purification efficiency of the present invention, the present application proposes the following technical solutions for the above technical problems, specifically:

[0060] like Figure 5 and Figure 6 As shown, a plastic shell 261 is provided on the outer side of the annular sponge 260. The cross-section of the plastic shell 261 in the vertical direction is a U-shaped structure and a hydrophobic hole is provided on its bottom surface. The plastic shell 261 and the groove 250 in the outer ring 222 form a closed negative pressure cavity. The negative pressure cavity and the plastic shell 261 cooperate with each other to squeeze the annular sponge 260 to achieve a water removal effect.

[0061] The plastic shell 261 is provided to isolate the annular sponge 260 from the external environment, forming a relatively closed space, which can effectively prevent the moisture that has been adsorbed by the annular sponge 260 from flowing back into the air under external pressure or temperature changes, thereby ensuring the stability of the water removal effect; at the same time, a multi-level filtration system is formed during the filtration process, and the rotation of the rotating ring 220 can preliminarily remove large particles of impurities in the air, and the synergistic effect of the negative pressure chamber and the annular sponge 260 can further remove moisture and tiny particles in the air; the design of the plastic shell 261 and the negative pressure chamber can effectively protect the annular sponge 260 from the direct impact of the external environment, thereby extending the service life of the sponge.

[0062] Embodiment 4: In order to further control the water absorption and water removal effect of the annular sponge 260 and improve the applicability of the present invention, the present application proposes the following technical solutions for the above technical problems, specifically:

[0063] like Figure 6-Figure 10 As shown, the side of the plastic package shell 261 facing the negative pressure chamber is a flexible elastic layer 262, and a plurality of magnetic blocks 263 are evenly arranged on the outer side of the elastic layer 262 along its circumference.

[0064] Two groups of electromagnetic blocks 231 cooperating with the magnetic blocks 263 are fixed on the inner side wall of the fixed sleeve 230 opposite to the elastic layer 262. The two groups of electromagnetic blocks 231 are arranged up and down, and two adjacent electromagnetic blocks 231 are arranged alternately up and down, so as to control the deformation size and stretching degree of the elastic layer 262, so as to control the water removal effect of the annular sponge 260.

[0065] The upper surface of the fixed sleeve 230 at one end below the rotating ring 220 is provided with a water flow groove 232 corresponding to the drain hole; a water pipe 233 is vertically fixed inside the side wall of the fixed sleeve 230, and the lower end of the water pipe 233 is connected to the water collecting container 400. Multiple water flow grooves 232 are connected by the water pipe 233, which is used to flow the separated water into the water collecting container 400 through the water flow grooves 232 and the water pipe 233 to be collected.

[0066] The elastic layer 262 and the negative pressure chamber can squeeze each other. Through the interaction between the electromagnetic block 231 and the magnetic block 263, the elastic layer 262 is deformed. At the same time, the negative pressure chamber has a certain sealing property. After the elastic layer 262 is deformed, the gas inside the negative pressure chamber pressurizes the elastic layer 262 and the annular sponge 260 inside it at the same time. The annular sponge 260 is squeezed, so that the moisture inside it is discharged through the water outlet. Therefore, the negative pressure chamber and the elastic layer 262 can improve the annular sponge 260's ability to adsorb and discharge moisture in the air. The pores inside the annular sponge 260 under the negative pressure environment can be more open, which is conducive to the entry and retention of water molecules.

[0067] During actual use, the moisture remaining on the side wall is absorbed by the annular sponge 260 through the drainage plate 223. The electromagnetic blocks 231 at different positions are started according to needs and the size of the magnetic attraction is controlled. At this time, the rotating ring 220 that rotates with the airflow drives the elastic layer 262 and the magnetic block 263 to rotate. The magnetic block 263 drives the elastic layer 262 to continuously stretch under the action of the magnetic attraction of the electromagnetic block 231. At the same time, under the action of the negative pressure chamber, the annular sponge 260 is squeezed, and the moisture squeezed out by the annular sponge 260 is discharged into the water trough 232 through the water outlet, and then converges into the water collection container 400 through the water guide pipe 233 and is discharged, completing the water filtering.

[0068] Through the interaction between the electromagnetic block 231 and the magnetic block 263, this embodiment can adapt to the rotating ring 220 and the magnetic block 263 inside it in a rotating state. At the same time, by controlling the size of the magnetic attraction force, the shape, size and deformation degree of the elastic layer 262 stretched by the magnetic force can be changed, thereby changing the squeezing force of the annular sponge 260, further controlling the water removal state and speed, and improving the filtered air quality and water removal effect.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A compressed air filter, comprising a filter support (100), a centrifuge (200), a filter (300) for filtering and purifying compressed air, a water collection container (400) for collecting water separated by centrifugation, an air inlet (500) and an air outlet (600), characterized in that: The centrifuge (200) comprises a centrifugal rotating track (210), a rotating ring (220) and a fixed sleeve (230); A plurality of centrifugal rotating tracks (210) are provided, all of which are fixed at intervals in the middle of the filter (300) from top to bottom in the vertical direction, and the centrifugal rotating tracks (210) are arranged in a spiral shape as a whole, so as to prolong the centrifugal action time of the compressed air; The rotating ring (220) is fixed inside the centrifuge (200) and is placed vertically with the centrifugal rotating track (210), and is used to filter and collect the water remaining on the side wall of the centrifugal rotating track (210); The fixed sleeve (230) is fixed in the middle of the filter (300) and is located outside the centrifugal rotating track (210) and the rotating ring (220); the rotating ring (220) is slidably connected to the inner wall of the fixed sleeve (230); the fixed sleeve (230) is used to place the rotating ring (220) and isolate the centrifugal rotating track (210) and the filter (300).

2. A compressed air filter according to claim 1, characterized in that: Three rotating rings (220) are provided, and all are slidably connected to the inner wall of the fixed sleeve (230) in sequence from top to bottom along the vertical direction; a rotating ring (220) is detachably fixed between two adjacent centrifugal rotating tracks (210).

3. A compressed air filter according to claim 2, characterized in that: The rotating ring (220) has two layers, namely an inner ring (221) and an outer ring (222); The inner ring (221) is fixed inside the centrifugal rotating track (210), and is connected to the outer ring (222) by ball sliding, and a screen (240) is fixed on the upper end thereof for filtering impurities in the airflow and separated water; The outer ring (222) is fixed to the outside of the centrifugal rotating track (210) and is slidably connected to the inside of the fixed sleeve (230), and is used to cooperate with the inner ring (221) to collect and remove filtered water.

4. A compressed air filter according to claim 3, characterized in that: A groove (250) is provided on a surface of the outer ring (222) opposite to the inner ring (221), and an annular sponge (260) is fixed inside the groove (250) for absorbing moisture remaining on the side wall of the centrifugal rotating track (210).

5. A compressed air filter according to claim 4, characterized in that: A plurality of guide plates (223) are evenly arranged on the outer side surface of the inner ring (221) along its circumference and from top to bottom. The guide plates (223) are placed tilted downward and their free ends extend into the interior of the annular sponge (260).

6. A compressed air filter according to claim 5, characterized in that: A guide slope is provided on one side of the outer ring (222) close to the centrifugal rotating track (210).

7. A compressed air filter according to claim 6, characterized in that: The outer side of the annular sponge (260) is covered with a plastic shell (261); the cross section of the plastic shell (261) in the vertical direction is a U-shaped structure and a hydrophobic hole is arranged on its bottom surface; the plastic shell (261) and the groove (250) in the outer ring (222) form a closed negative pressure cavity; the negative pressure cavity and the plastic shell (261) cooperate with each other to squeeze the annular sponge (260) to achieve a water removal effect.

8. A compressed air filter according to claim 7, characterized in that: The side of the plastic package shell (261) facing the negative pressure chamber is a flexible elastic layer (262), and a plurality of magnetic blocks (263) are evenly arranged on the outer side surface of the elastic layer (262) along its circumference.

9. A compressed air filter according to claim 8, characterized in that: Two groups of electromagnetic blocks (231) cooperating with the magnetic blocks (263) are fixed on the inner side wall of the fixed sleeve (230) and the elastic layer (262). The two groups of electromagnetic blocks (231) are arranged up and down, and two adjacent electromagnetic blocks (231) are arranged in an alternating manner up and down, so as to control the deformation size and stretching degree of the elastic layer (262), thereby controlling the water removal effect of the annular sponge (260).

10. A compressed air filter according to claim 9, characterized in that: The upper surface of the fixed sleeve (230) at one end below the rotating ring (220) is provided with a water flow groove (232) corresponding to the drain hole; a water guide pipe (233) is vertically fixed inside the side wall of the fixed sleeve (230); the lower end of the water guide pipe (233) is connected to the water collection container (400); a plurality of the water flow grooves (232) are connected through the water guide pipe (233) and are used to allow the separated water to flow into the water collection container (400) through the water flow grooves (232) and the water guide pipe (233) to be collected.

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