Compressed air filter

Abstract

The compressed air filter comprises a mounting shell, a first filtering assembly, a second filtering assembly, a silica gel filtering assembly and an activated carbon filtering assembly, and the mounting shell is provided with an airflow channel, an airflow inlet and an airflow outlet, the first filtering assembly, the second filtering assembly, the silica gel filtering assembly and the activated carbon filtering assembly are sequentially connected to the mounting shell and all communicated with the airflow channel, and airflow enters the airflow channel along the airflow inlet, flows through the first filtering assembly, the second filtering assembly, the silica gel filtering assembly and the activated carbon filtering assembly respectively and finally flows out along the airflow outlet; wherein the silica gel filtering assembly is provided with a containing space used for containing allochroic silica gel, a plurality of observation windows are arranged on the surface of the silica gel filtering assembly, and the observation windows allow a user to observe the allochroic silica gel in the containing space.

Description

Technical Field

[0001] This invention relates to the field of filtration device technology, and more particularly to a compressed air filter. Background Technology

[0002] Compressed air is widely used in all industrial sectors, such as semiconductor manufacturing, electronics, machinery, chemicals, automotive, metallurgy, and furniture. This type of compressed air is mostly produced by compressing atmospheric air using a compressor. However, this process often results in compressed air containing impurities such as water, oil, and dust, which can severely impact product quality across various industries. In precision industrial applications requiring a clean environment, this type of compressed air is insufficient. Therefore, compressed air filters are widely used to filter and remove impurities from compressed air.

[0003] Existing compressed air filters typically employ multi-stage filtration structures to remove moisture, oil mist, particulate impurities, and harmful gases from compressed air. These filters mainly include oil-water separators, fine filters, silica filters, and activated carbon filters. During use, these components need to be replaced periodically to ensure filtration effectiveness. However, due to varying product usage frequencies, periodic replacement cannot guarantee the effectiveness of each filter element. In particular, it's impossible to accurately determine whether the silica filter has reached saturation. Replacing the silica filter too early reduces production efficiency and increases production costs, while replacing it too late affects the product's filtration performance, failing to effectively filter water.

[0004] To address these issues, the present invention provides a compressed air filter that effectively solves the aforementioned problems. It has a simple structure and allows users to directly observe the saturation of the silica filter element through a visual window, enabling timely replacement of the silica filter element and other filter components. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a compressed air filter with a simple structure. The filter allows users to directly observe the saturation of the silica filter element through a visualization window, so that the silica filter element and other filter components can be replaced in a timely manner.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A compressed air filter, comprising:

[0008] The mounting housing comprises a first filter assembly, a second filter assembly, a silica gel filter assembly, and an activated carbon filter assembly. The mounting housing is provided with an airflow channel and an airflow inlet and an airflow outlet connected to the airflow channel.

[0009] The first filter assembly, the second filter assembly, the silica gel filter assembly, and the activated carbon filter assembly are sequentially connected to the mounting housing and are all connected to the airflow channel. The airflow enters the airflow channel along the airflow inlet and flows through the first filter assembly, the second filter assembly, the silica gel filter assembly, and the activated carbon filter assembly respectively, and finally flows out along the airflow outlet.

[0010] The silicone filter assembly has a receiving space for accommodating the color-changing silicone, and the surface of the silicone filter assembly has a plurality of observation windows, which allow the user to observe the color-changing silicone in the receiving space.

[0011] The beneficial effects of this invention are as follows: With the above-described structure, during use, the airflow enters the airflow channel through the airflow inlet, then enters the first filter assembly. After preliminary filtration, most of the water in the airflow is removed, leaving the water in the first filter assembly. The airflow then flows out, passes through the airflow channel, and enters the second filter assembly. After further filtration, most of the oil in the airflow is removed, leaving the oil in the second filter assembly. The airflow then flows out, passes through the airflow channel, and enters the silica gel filter assembly. The color-changing silica gel in the silica gel filter assembly absorbs water, further removing water from the airflow. Simultaneously, the color-changing silica gel absorbs water and changes color, which the user can observe through the observation window. The color of the color-changing silica gel is used to determine its water saturation. When the water saturation of the color-changing silica gel exceeds the preset value, the silica gel can be reduced by heating or replaced to ensure that it can continue to absorb the remaining moisture and indicate the moisture content in the airflow, ensuring that the moisture content of the airflow passing through the silica gel filter assembly is lower than the preset value. The airflow flows out along the silica gel filter assembly, passes through the airflow channel and enters the activated carbon filter assembly. The activated carbon filter element in the activated carbon filter assembly further adsorbs and filters the remaining oil vapor in the airflow. The clean airflow, after being filtered through multiple layers, flows out to the airflow channel and finally flows out along the airflow outlet. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention from one angle;

[0015] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0016] Figure 3 This is a schematic diagram of the exploded structure of the present invention from one angle;

[0017] Figure 4 This is a schematic diagram of the exploded structure from another angle of the present invention;

[0018] Figure 5 yes Figure 3 Enlarged view of circle A;

[0019] Figure 6 yes Figure 4 Enlarged view of circle B;

[0020] Figure 7 This is a schematic diagram of the gas flow direction of the present invention;

[0021] Figure 8 This is a cross-sectional view of the present invention;

[0022] Figure 9 yes Figure 8 Enlarged view of circle C;

[0023] Figure 10 yes Figure 8 Enlarged view of circle D;

[0024] Figure 11 This is a cross-sectional view of the present invention in automatic drainage mode when the liquid level in the first filter chamber is lower than a preset value;

[0025] Figure 12 This is a cross-sectional view of the present invention in automatic drainage mode when the liquid level in the first filter chamber is higher than the preset value;

[0026] Figure 13 This is a cross-sectional view of the present invention during manual drainage;

[0027] Figure 14 This is a partial schematic diagram of the automatic drainage component of the present invention. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] Reference Figures 1 to 14 A compressed air filter, comprising:

[0035] The mounting housing 100 comprises a first filter assembly 200, a second filter assembly 300, a silica gel filter assembly 400, and an activated carbon filter assembly 500. The mounting housing 100 is provided with an airflow channel 101 and an airflow inlet 102 and an airflow outlet 103 connected to the airflow channel 101.

[0036] The first filter assembly 200, the second filter assembly 300, the silica gel filter assembly 400, and the activated carbon filter assembly 500 are sequentially connected to the mounting housing 100 and are all connected to the airflow channel 101. The airflow enters the airflow channel 101 along the airflow inlet 102 and flows through the first filter assembly 200, the second filter assembly 300, the silica gel filter assembly 400, and the activated carbon filter assembly 500 respectively, and finally flows out along the airflow outlet 103.

[0037] The silicone filter assembly 400 is provided with a receiving space 401 for accommodating the color-changing silicone, and the surface of the silicone filter assembly 400 is provided with a plurality of observation windows 411, which allow the user to observe the color-changing silicone in the receiving space 401.

[0038] With the above structure, during use, the airflow enters the airflow channel 101 through the airflow inlet 102, and then enters the first filter assembly 200. After preliminary filtration, most of the water, solid dust, and other impurities in the airflow are removed, leaving the water and impurities in the first filter assembly 200. The airflow then flows out, passes through the airflow channel 101, and enters the second filter assembly 300. After further filtration, most of the oil and remaining dust in the airflow are removed, leaving the oil in the second filter assembly 300. The airflow then flows out, passes through the airflow channel 101, and enters the silica gel filter assembly 400. The color-changing silica gel in the silica gel filter assembly 400 absorbs water, further removing water from the airflow. At the same time, the color-changing silica gel absorbs water and changes color, which the user can see through the observation window 411. The color of the color-changing silica gel is observed to determine its water saturation. When the water saturation of the color-changing silica gel exceeds the preset value, it can be reduced by heating or replaced to ensure that the color-changing silica gel can continue to absorb the remaining moisture and indicate the moisture content in the airflow, ensuring that the moisture content of the airflow flowing through the silica gel filter assembly 400 is lower than the preset value. The airflow flows out along the silica gel filter assembly 400, flows through the airflow channel 101 and enters the activated carbon filter assembly 500. The activated carbon filter element in the activated carbon filter assembly 500 further adsorbs and filters the remaining oil vapor and odor molecules in the airflow. The clean airflow after layers of filtration flows out to the airflow channel 101 and finally flows out along the airflow outlet 103.

[0039] In this embodiment, the silicone filter assembly 400 includes a silicone filter housing 410 and an air guide tube 420. The accommodating space 401 is disposed within the silicone filter housing 410. The mounting housing 100 is provided with a third air inlet 104a and a third air outlet 104b. The air guide tube 420 is connected to the mounting housing 100. The internal channel of the air guide tube 420 is connected to the third air inlet 104a. The end of the air guide tube 420 extends to the bottom of the accommodating space 401. With the above-described structure, the air duct 420 can guide the airflow to the bottom of the receiving space 401, allowing the airflow to fully contact the color-changing silica gel in the receiving space 401. This increases the contact area between the airflow and the color-changing silica gel, enabling the color-changing silica gel to effectively absorb moisture from the airflow and ensuring the product's moisture absorption effect. Furthermore, the full contact between the airflow and the color-changing silica gel also ensures that the degree of color change in each part of the silica gel is roughly the same, allowing users to more accurately judge the saturation of the silica gel by its color. This also prevents the color-changing silica gel in some areas from being blocked by other uncolored silica gel, thus affecting the user's judgment. Preferably, the silicone filter housing 410 includes a third sleeve 412 and two third end components 413. The two third end components 413 are respectively connected to the upper and lower ends of the third sleeve 412. Specifically, each of the two third end components 413 is provided with a locking block 413a. The inner wall of the third sleeve 412 is provided with a locking groove 412a and an insertion port 412b communicating with the locking groove 412a. After the locking block 413a is inserted along the insertion port 412b, the third end component 413 is screwed to insert the locking block 413a into the locking groove 412a. At this time, the second threaded hole 413b on the third end component 413 and... The third threaded holes 412c on the third sleeve 412 correspond to each other. The first screw 460 is threaded into the second threaded hole 413b and the third threaded hole 412c to fix the third end component 413 to the third sleeve 412. Preferably, the upper third end component 413 is connected to the mounting housing 100 through a connector. The upper surface of the upper third end component 413 is provided with a sealing groove 413c. The first sealing ring 470 is disposed in the sealing groove 413c and abuts against the lower surface of the mounting housing 100 to achieve a seal between the silicone filter housing 410 and the mounting housing 100. Preferably, a sealing ring is also present between the third sleeve 412 and the third end component 413 to achieve a seal between the third sleeve 412 and the third end component 413.

[0040] In this embodiment, the silicone filter assembly 400 further includes a first grille 430, which is disposed on the bottom wall of the silicone filter housing 410 and extends upward. The first grille 430 is sleeved on the end of the air guide tube 420. With the above structure, the tubular first grille 430 sleeved on the end of the air guide tube 420 can block the color-changing silicone, preventing it from entering the air guide tube 420 and ensuring normal airflow. In use, the airflow enters the interior of the air guide tube 420 from the third air inlet 104a and flows out along the end of the air guide tube 420, passes through the gap of the first grille 430, flows into the receiving space 401, flows over the surface of the color-changing silicone, makes full contact with the color-changing silicone, and finally flows out along the second air outlet 104b.

[0041] In this embodiment, the end sidewall of the air duct 420 is provided with a vent hole 421, and the first grille 430 covers the vent hole 421. With the above structure, the end sidewall of the air duct 420 has a racetrack-shaped vent hole 421, which extends along the length of the air duct 420. In use, airflow passes through the air duct 420 and flows out along the vent hole 421. Furthermore, the first grille 430 covers the vent hole 421 to prevent the color-changing silicone from entering the air duct 420 through the vent hole 421, ensuring smooth airflow.

[0042] In this embodiment, the silicone filter assembly 400 further includes a fixing member 440, which is connected to the inner wall of the silicone filter housing 410. The fixing member 440 has a first mounting hole 441 in the center and a through hole 442 surrounding the first mounting hole 441. A snap-fit ​​block 422 is provided on the upper part of the outer wall of the air guide tube 420. The air guide tube 420 passes through the first mounting hole 441, and the snap-fit ​​block 422 abuts against the lower surface of the fixing member 440. With the above structure, the air guide tube 420 passes through the first mounting hole 441, which restricts the radial movement of the air guide tube 420. The snap-fit ​​block 422 abuts against the lower surface of the fixing member 440, which restricts the axial upward movement of the air guide tube 420, ensuring a stable connection of the air guide tube 420 and a longer product service life.

[0043] In this embodiment, the silicone filter assembly 400 further includes a second grille 450, which is disposed at the opening of the silicone filter assembly 400. The second grille 450 is provided with a second mounting hole 451. The mounting housing 100 has a downwardly extending third mounting tube 130. The third air inlet 104a is disposed in the third mounting tube 130. The end of the third mounting tube 130 passes through the second mounting hole 451 and is inserted into the air guide tube 420. With the above-described structure, the second grille 450 is positioned at the opening of the silicone filter assembly 400, effectively covering the opening and preventing discolored silicone from entering the airflow channel 101 with the airflow, thus ensuring product stability. Furthermore, the end of the third mounting tube 130 is inserted into the air guide tube 420, facilitating user assembly of the air guide tube 420 and improving installation efficiency. Preferably, the end of the third mounting tube 130 is provided with a guide slope 131, causing the diameter of the end of the third mounting tube 130 to gradually increase from bottom to top. The guide slope 131 further facilitates the user connecting the air guide tube 420 to the third mounting tube 130. Preferably, a second sealing ring 132 is fitted on the outer wall of the end of the third mounting tube 130. When the end of the third mounting tube 130 is inserted into the air guide tube 420, the outer surface of the second sealing ring 132 abuts against the inner wall of the air guide tube 420, improving the airtightness between the third mounting tube 130 and the air guide tube 420.

[0044] In this embodiment, the first filter assembly 200 includes a first filter housing 210 and a first filter element 220. The mounting housing 100 is provided with a first air inlet 105a and a first air outlet 105b. The first filter housing 210 is provided with a first filter chamber 201. The first air inlet 105a and the first air outlet 105b are both connected to the first filter chamber 201. The first filter element 220 is disposed in the first filter chamber 201 and connected to the first air outlet 105b. With the above structure, during use, the airflow flows along the airflow channel 101, passes through the first air inlet 105a into the first filter chamber 201, and passes through the first filter element 220. Moisture, dust, and other solid impurities in the airflow are blocked by the first filter element 220 and remain in the first filter chamber 201. The airflow finally flows out along the first air outlet 105b. Preferably, the first filter housing 210 includes a first sleeve 211 and a first end component 212. The upper end of the first sleeve 211 is threaded to the mounting housing 100, and the first end component 212 is threaded to the lower end of the first sleeve 211. A sealing ring is also present between the first sleeve 211 and the first end component 212 to achieve a seal between the first sleeve 211 and the first end component 212.

[0045] In this embodiment, the bottom wall of the first filter housing 210 is provided with a water outlet channel 202. The compressed air filter also includes an automatic drainage component 600, which is disposed in the first filter chamber 201. The automatic drainage component 600 includes a buoyancy member 610, a connecting rod 620, and a sealing plug 630 disposed on the connecting rod 620. The lower end of the connecting rod 620 is connected to the bottom wall of the first filter housing 210, and the upper end of the connecting rod 620 is connected to the buoyancy member 610. The sealing plug 630 covers the water outlet channel 202. When the liquid level in the first filter chamber 201 is higher than a preset value, the buoyancy member 610 moves upward under the action of buoyancy, and the sealing plug 630 is detached from the water outlet channel 202 to allow water to flow out along the water outlet channel 202. With the above structure, when the airflow passes through the first filter element 220, the water quickly condenses into large water droplets on the surface of the first filter element 220. Under the action of gravity, the large water droplets flow into the bottom of the first filter chamber 201. When the liquid level in the first filter chamber 201 is lower than the preset value, the buoyancy of the buoyancy component 610 is small. Under the action of gravity, it drives the sealing plug 630 to tightly cover the water outlet channel 202, ensuring the product's airtightness. When the liquid level in the first filter chamber 201 is higher than the preset value, the buoyancy component 610 moves upward under the action of buoyancy, driving the connecting rod 620 and the sealing plug 630 to move. The sealing plug 630 is detached from the water outlet channel 202, allowing water to flow out along the water outlet channel 202, realizing automatic drainage.

[0046] In this embodiment, the diameter of the inlet end of the water outlet channel 202 is smaller than the diameter of the outlet end of the water outlet channel 202. With this structural arrangement, the diameter of the water outlet channel 202 gradually increases from the inlet end to the outlet end, which reduces the water flow velocity at the outlet end, preventing excessively fast flow and ensuring smooth and stable liquid discharge. Simultaneously, it avoids gas blockage and impurity clogging, extending the product's service life.

[0047] In this embodiment, the buoyancy component 610 is provided with grooves 611 on both sides, and the automatic drainage assembly 600 further includes a limiting component 640. The limiting component 640 includes two vertical rods 641 and one horizontal rod 642. The lower ends of the two vertical rods 641 are connected to the bottom wall of the first filter housing 210, and the upper ends of the two vertical rods 641 are connected to both ends of the horizontal rod 642. The vertical rods 641 are disposed within the grooves 611, and the horizontal rod 642 is disposed across the upper end of the buoyancy component 610. With the above structure, when the buoyancy component 610 rises or falls under the action of buoyancy and / or gravity, the vertical rods 641 are always within the grooves 611, limiting the movement direction of the buoyancy component 610 and preventing it from swaying left and right or back and forth. After the buoyancy component 610 falls, it can stably drive the sealing plug 630 to tightly cover the water outlet channel 202, making the product structure more stable.

[0048] In this embodiment, the compressed air filter further includes a manual release component 700, which includes a drive rod 710. The drive rod 710 includes a first threaded portion 711 and a pressing portion 713. The bottom wall of the first filter housing 210 is provided with a rod hole 203, which includes an upper first threaded hole 203a and a lower rod hole 203b. The first threaded portion 711 is threadedly connected to the first threaded hole 203a. When the first threaded portion 711 is disengaged from the first threaded hole 203a, the pressing portion 713 slides upward in the rod hole 203b under external force. The first threaded portion 711 pushes the connecting rod 620 upward, so that the sealing plug 630 is disengaged from the water outlet channel 202. With the above structure, during use, the drive rod 710 is turned to disengage the first threaded part 711 from the first threaded hole 203a. Then, the drive rod 710 is pressed to slide upwards. The upper end of the drive rod 710 abuts against the connecting rod 620, causing the connecting rod 620 to move upwards, thus removing the sealing plug 630 from the water outlet channel 202. At this time, the water in the first filter chamber 201 can flow out along the water outlet channel 202. Using the above structure allows the user to manually drain the water, preventing the accumulated liquid in the first filter chamber 201 from corroding the first filter housing 210.

[0049] In this embodiment, the manual release assembly 700 further includes a spring 720, and the drive rod 710 further includes a connecting rod portion 712. The diameter of the connecting rod portion 712 is smaller than the diameter of the first threaded portion 711 and the diameter of the pressing portion 713. The inner diameter of the first threaded hole 203a is smaller than the inner diameter of the rod hole 203b. The spring 720 is disposed in the rod hole 203b and sleeved on the connecting rod portion 712, and its two ends respectively abut against the upper end wall of the rod hole 203b and the upper end face of the pressing portion 713. The spring 720 causes the drive rod 710 to have a downward movement tendency. With the above structure, after the user manually drains water using the manual release assembly 700, the user releases the drive rod 710. The drive rod 710 moves downward and resets under the drive of the spring 720. Then, the buoyancy component 610 moves downward under the action of gravity, driving the sealing plug 630 to tightly cover the water outlet channel 202, ensuring the product's sealing performance.

[0050] In this embodiment, the mounting housing 100 has a downwardly extending first mounting tube 110, the first air outlet 105b is disposed on the first mounting tube 110, and the upper end of the first filter element 220 is threadedly connected to the end of the first mounting tube 110. With this structural arrangement, in use, the upper end of the first filter element 220 is threadedly connected to the end of the first mounting tube 110, ensuring a stable connection between the first filter element 220 and the mounting housing 100. This results in a stable product structure and facilitates user replacement of the first filter element 220, guaranteeing the product's filtration effect.

[0051] In this embodiment, the second filter assembly 300 includes a second filter housing 310 and a second filter element 320. The mounting housing 100 is provided with a second air inlet 106a and a second air outlet 106b. The second filter housing 310 is provided with a second filter chamber 301. The second air inlet 106a and the second air outlet 106b are both connected to the second filter chamber 301. The second filter element 320 is disposed in the second filter chamber 301 and connected to the second air inlet 106a. With the above structure, in use, the second filter element 320 is placed in the second filter chamber 301, with the second air inlet 106a facing the center of the second filter element 320, so that the airflow passes through the side wall of the second filter element 320, filtering liquid oil mist and fine dust in the airflow. The airflow then flows into the second filter chamber 301 and flows out along the second air outlet 106b. Preferably, the second filter housing 310 includes a second sleeve 311 and a second end component 312. The upper end of the second sleeve 311 is threaded to the mounting housing 100, and the second end component 312 is threaded to the lower end of the second sleeve 311. Furthermore, a sealing ring is also present between the second sleeve 311 and the second end component 312 to achieve a seal between the second sleeve 311 and the second end component 312.

[0052] In this embodiment, the mounting housing 100 has a downwardly extending second mounting tube 120, the second air inlet 106a is disposed on the second mounting tube 120, and the upper end of the second filter element 320 is threadedly connected to the end of the second mounting tube 120. Through the above structural arrangement, the upper end of the second filter element 320 is threadedly connected to the end of the second mounting tube 120, allowing the second filter element 320 to be stably connected to the second mounting tube 120. Simultaneously, it facilitates user replacement of the second filter element 320, thereby extending the product's service life.

[0053] In this embodiment, the second filter assembly 300 further includes a drain plug 330. The bottom wall of the second filter housing 310 is provided with a drain channel 302. The drain channel 302 includes a sealing channel 302a and a separation channel 302b. The diameter of the sealing channel 302a is smaller than the diameter of the separation channel 302b. The inner wall of the separation channel 302b is provided with a second internal thread 302c. The drain plug 330 is provided with a blind hole 331 with an opening facing downwards. The blind hole 331 is provided with a drain port 332 that penetrates the side wall of the blind hole 331. The drain plug 330 includes a sealing part 333 and a second threaded part 334. The diameter of the sealing part 333 is smaller than the diameter of the second threaded part 334. The second threaded part 334 is threadedly connected to the second internal thread 302c. The sealing part 333 is inserted into or removed from the sealing channel 302a to cover or expose the drain port 332. With the above structure, during use, the second threaded part 334 is threaded to the second internal thread 302c, and the sealing part 333 is inserted into the sealing channel 302a. At this time, the drain port 332 is covered by the sealing channel 302a, which can effectively achieve sealing. When draining the oil in the second filter chamber 301, the user screws the drain plug 330 to move the drain plug 330 downward until the sealing part 333 is removed from the sealing channel 302a. At this time, the drain port 332 is directly opposite the side wall of the separation channel 302b, and the oil flows out along the sealing channel 302a - drain port 332 - blind hole 331, which makes it convenient for the user to manually drain the oil in the second filter chamber 301, making it easy to use.

[0054] In this embodiment, the activated carbon filter assembly 500 includes an activated carbon filter housing 510 and a fourth filter element 520. The mounting housing 100 is provided with a fourth air inlet 107a and a fourth air outlet 107b. The activated carbon filter housing 510 is provided with a fourth filter chamber 501. The fourth air inlet 107a and the fourth air outlet 107b are both connected to the fourth filter chamber 501. The fourth filter element 520 is disposed in the fourth filter chamber 501 and connected to the fourth air outlet 107b. With the above-described structure, during use, the fourth filter element 520 is placed inside the fourth filter chamber 501 and connected to the fourth air outlet 107b of the mounting housing 100. Airflow enters the fourth filter chamber 501 through the fourth air inlet 107a, passes through the fourth filter element 520, and then flows out through the fourth air outlet 107b. The fourth filter element 520 is an activated carbon filter element, which can effectively adsorb residual oil vapor in the airflow, further removing oil and ensuring the product's filtration effect. Preferably, the activated carbon filter housing 510 includes a fourth sleeve 511 and a fourth end component 512. The upper end of the fourth sleeve 511 is threaded to the mounting housing 100, and the fourth end component 512 is threaded to the lower end of the fourth sleeve 511.

[0055] In this embodiment, the mounting housing 100 has a downwardly extending fourth mounting tube 140, the fourth air outlet 107b is disposed on the fourth mounting tube 140, and the upper end of the fourth filter element 520 is threadedly connected to the end of the fourth mounting tube 140. With this structural arrangement, during use, the upper end of the fourth filter element 520 is threadedly connected to the end of the fourth mounting tube 140, resulting in a more stable product connection. Furthermore, it is more convenient for users to replace the fourth filter element 520.

[0056] In this embodiment, the fourth filter element 520 includes a filter element portion 521 and a connecting pipe 522. The upper end of the connecting pipe 522 is threaded to the end of the fourth mounting pipe 140, and the lower end of the connecting pipe 522 is threaded to the upper end of the filter element portion 521. With this structure, the connecting pipe 522 is positioned between the filter element portion 521 and the fourth mounting pipe 140, increasing the distance between the filter element portion 521 and the air inlet. This slows down the airflow velocity through the filter element portion 521, allowing the activated carbon component in the filter element portion 521 to more effectively adsorb residual oil vapor and odor molecules in the airflow, thus improving the product's filtration effect.

[0057] In this embodiment, the compressed air filter further includes two pressure gauges 800, which are respectively connected to the front and rear ends of the mounting housing 100, and the test airflow channels of the two pressure gauges 800 are respectively connected to the airflow inlet 102 and the airflow outlet 103. With the above structural arrangement, the pressure gauges 800 can be used to measure the air pressure at the airflow inlet 102 and / or the airflow outlet 103, allowing users to easily adjust the power of the air compressor to ensure that the final output airflow pressure meets usage requirements.

Claims

1. A compressed air filter, characterized in that, include: The mounting housing (100) comprises a first filter assembly (200), a second filter assembly (300), a silica gel filter assembly (400), and an activated carbon filter assembly (500). The mounting housing (100) is provided with an airflow channel (101) and an airflow inlet (102) and an airflow outlet (103) connected to the airflow channel (101). The first filter assembly (200), the second filter assembly (300), the silica gel filter assembly (400), and the activated carbon filter assembly (500) are sequentially connected to the mounting housing (100) and are all connected to the airflow channel (101). The airflow enters the airflow channel (101) along the airflow inlet (102) and flows through the first filter assembly (200), the second filter assembly (300), the silica gel filter assembly (400), and the activated carbon filter assembly (500) respectively, and finally flows out along the airflow outlet (103). The silicone filter assembly (400) is provided with a receiving space (401) for accommodating the color-changing silicone, and the surface of the silicone filter assembly (400) is provided with a plurality of observation windows (411), which allow the user to observe the color-changing silicone in the receiving space (401).

2. The compressed air filter according to claim 1, characterized in that, The silicone filter assembly (400) includes a silicone filter housing (410) and an air guide tube (420). The accommodating space (401) is disposed inside the silicone filter housing (410). The mounting housing (100) is provided with a third air inlet (104a) and a third air outlet (104b). The air guide tube (420) is connected to the mounting housing (100). The internal channel of the air guide tube (420) is connected to the third air inlet (104a). The end of the air guide tube (420) extends to the bottom of the accommodating space (401).

3. The compressed air filter according to claim 2, characterized in that, The silicone filter assembly (400) further includes a first grid member (430), which is disposed on the bottom wall of the silicone filter housing (410) and extends upward. The first grid member (430) is sleeved on the end of the air guide tube (420). The end side wall of the air guide tube (420) is provided with an air vent (421), and the first grid member (430) covers the air vent (421).

4. The compressed air filter according to claim 3, characterized in that, The silicone filter assembly (400) further includes a fixing member (440), which is connected to the inner wall of the silicone filter housing (410). The fixing member (440) has a first mounting hole (441) in the middle and a through hole (442) surrounding the first mounting hole (441). The upper part of the outer wall of the air guide tube (420) is provided with a snap-fit ​​block (422). The air guide tube (420) passes through the first mounting hole (441), and the snap-fit ​​block (422) abuts against the lower surface of the fixing member (440).

5. The compressed air filter according to claim 2, characterized in that, The silicone filter assembly (400) further includes a second grille (450), which is disposed at the opening of the silicone filter assembly (400). The second grille (450) is provided with a second mounting hole (451). The mounting housing (100) has a downwardly extending third mounting tube (130). The third air inlet (104a) is disposed in the third mounting tube (130). The end of the third mounting tube (130) passes through the second mounting hole (451) and is inserted into the air guide tube (420).

6. The compressed air filter according to claim 1, characterized in that, The first filter assembly (200) includes a first filter housing (210) and a first filter element (220). The mounting housing (100) is provided with a first air inlet (105a) and a first air outlet (105b). The first filter housing (210) is provided with a first filter chamber (201). The first air inlet (105a) and the first air outlet (105b) are both connected to the first filter chamber (201). The first filter element (220) is disposed in the first filter chamber (201) and connected to the first air outlet (105b).

7. The compressed air filter according to claim 6, characterized in that, The bottom wall of the first filter housing (210) is provided with a water outlet channel (202). The compressed air filter also includes an automatic drainage assembly (600). The automatic drainage assembly (600) is disposed in the first filter chamber (201). The automatic drainage assembly (600) includes a buoyancy member (610), a connecting rod (620), and a sealing plug (630) disposed on the connecting rod (620). The lower end of the connecting rod (620) is connected to the bottom wall of the first filter housing (210), and the upper end of the connecting rod (620) is connected to the buoyancy member (610). The sealing plug (630) covers the water outlet channel (202). When the liquid level in the first filter chamber (201) is higher than a preset value, the buoyancy member (610) moves upward under the action of buoyancy, and the sealing plug (630) is detached from the water outlet channel (202) to allow water to flow out along the water outlet channel (202).

8. The compressed air filter according to claim 7, characterized in that, The buoyancy component (610) is provided with grooves (611) on both sides. The automatic drainage assembly (600) also includes a limiting component (640). The limiting component (640) includes two vertical rods (641) and one horizontal rod (642). The lower ends of the two vertical rods (641) are connected to the bottom wall of the first filter housing (210). The upper ends of the two vertical rods (641) are connected to both ends of the horizontal rod (642). The vertical rods (641) are set in the grooves (611). The horizontal rod (642) spans the upper end of the buoyancy component (610).

9. The compressed air filter according to claim 7, characterized in that, The compressed air filter further includes a manual release assembly (700), which includes a drive rod (710). The drive rod (710) includes a first threaded portion (711) and a pressing portion (713). The bottom wall of the first filter housing (210) is provided with a rod hole (203). The rod hole (203) includes an upper first threaded hole (203a) and a lower rod hole (203b). The first threaded portion (711) is threadedly connected to the first threaded hole (203a). When the first threaded portion (711) is disengaged from the first threaded hole (203a), the pressing portion (713) slides upward in the rod hole (203b) under external force. The first threaded portion (711) pushes the connecting rod (620) to move upward, so that the sealing plug (630) is disengaged from the water outlet channel (202).

10. The compressed air filter according to claim 9, characterized in that, The manual release assembly (700) further includes a spring (720), and the drive rod (710) further includes a connecting rod portion (712). The diameter of the connecting rod portion (712) is smaller than the diameter of the first threaded portion (711) and the diameter of the pressing portion (713). The inner diameter of the first threaded hole (203a) is smaller than the inner diameter of the rod hole (203b). The spring (720) is disposed in the rod hole (203b) and sleeved on the connecting rod portion (712), and its two ends abut against the upper end wall of the rod hole (203b) and the upper end face of the pressing portion (713), respectively. The spring (720) causes the drive rod (710) to have a downward movement tendency.

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