Compressed pneumatic circuit

Abstract

To provide an air filter which is disposed in a compressed pneumatic circuit and is capable of separating / adsorbing CO2 in compressed air.SOLUTION: An air filter disposed in a compressed pneumatic circuit consists of a body, a filter element fitted to the body, a bowl shielding the filter element from the outside air, and a CO2 adsorbing part. The body has an inlet port and an outlet port of the compressed air. The filter element is a cylindrical body having an element for removing foreign substance in the air. The compressed air entering through the inlet port adopts means which passes the CO2 adsorbing part and the element in the filter element and exhausts it through the outlet port.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air filter disposed in a compressed air pressure circuit, and more particularly to an air filter with a CO2 adsorption function that is disposed in a compressed air pressure circuit and separates and adsorbs CO2 in the compressed air discharged by an air compressor. [Background technology]

[0002] Conventionally, in order to capture CO2 in a compressed air circuit, it was necessary to install additional equipment such as a CO2 capture tank, which was difficult to achieve in a limited space. Therefore, there has been a demand for a configuration in the compressed air circuit that can capture CO2 without using a device dedicated to CO2 capture.

[0003] Therefore, in order to solve the above problem, the applicant developed a compressed air pressure circuit in which a CO2 capture device is arranged at the final stage, and proposed the technology described in Japanese Patent Application Laid-Open No. 2023-100353 (Patent Document 1). According to this technical proposal, by arranging the CO2 capture device at the final stage of the compressed air pressure circuit, it is possible to improve the operating efficiency of the CO2 capture device and reduce the CO2 content in the compressed air that is ultimately released into the atmosphere, which is an excellent effect. However, according to the technical proposal described in Patent Document 1, a CO2 capture device must be added to the facility, and if there is limited space for the facility downstream of the compressed air utilization device, the device cannot be placed there, and the above problem has not yet been solved.

[0004] Therefore, the applicant focused on the problem of the need for separate equipment to capture CO2, and came up with the idea that CO2 could be captured using an air filter installed in a compressed air pressure circuit.He developed an air filter that is equipped with a CO2 adsorption section within the air filter, which is capable of separating and adsorbing CO2 contained in the compressed air that flows into the air filter, and has come to propose the ``air filter'' of the present invention. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-100353 Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above problems, an object of the present invention is to provide an air filter that is disposed in a compressed air pressure circuit and is capable of separating and adsorbing CO2 in compressed air. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides an air filter that is arranged in a compressed air pressure circuit and is composed of a body, a filter element attached to the body, a bowl that isolates the filter element from the outside air, and a CO2 adsorption part, the body having an inlet and outlet for compressed air, the filter element being a cylindrical body having an element that removes foreign matter from the air, and a means is employed in which compressed air that enters through the inlet passes through the CO2 adsorption part and the element within the filter element before being discharged from the outlet.

[0008] The present invention also employs a means in which a CO2 adsorption portion is provided in the hollow portion of the filter element.

[0009] Furthermore, the present invention employs a means in which the CO2 adsorption portion is made of any one of an amine compound, ceramics, zeolite, and activated carbon.

[0010] Furthermore, the present invention employs a means in which the CO2 adsorption portion is in the form of wool.

[0011] Furthermore, the present invention employs a means in which the CO2 adsorption portion is in the form of a sheet.

[0012] Furthermore, the present invention employs a means in which the CO2 adsorption section is made up of a plurality of layers, each layer having a different density.

[0013] Furthermore, the present invention employs a means in which the compressed air entering from the inlet passes through the CO2 adsorption section and then the element.

[0014] Furthermore, the present invention employs a compressed air pressure circuit in which the air filter is disposed, in which oil mist removing means is disposed in the stage preceding the air filter.

[0015] Furthermore, the present invention employs a compressed air pressure circuit in which the air filter is disposed, in which the air compressor disposed in the compressed air pressure circuit is an oil-free type. [Effects of the Invention]

[0016] According to the air filter of the present invention, compressed air enters the air filter through its inlet, passes through the CO2 adsorption section and element, and is discharged from the outlet, thereby enabling CO2 recovery without adding new equipment or changing the equipment configuration, thereby achieving the excellent effect of improving the global environment.

[0017] Furthermore, according to the air filter of the present invention, the CO2 adsorption section is provided in the hollow section of the filter element, which makes it possible to provide the CO2 adsorption section without modifying the existing filter element, etc., and the CO2 adsorption section can be replaced at the same time as the filter element is replaced, which simplifies the installation and replacement work.

[0018] Furthermore, according to the air filter of the present invention, the CO2 adsorption section is composed of any of an amine compound, ceramics, zeolite, and activated carbon, which enables the air filter to efficiently adsorb and desorb CO2, contributing to the effective use of CO2 separated and removed from compressed air.

[0019] Furthermore, according to the air filter of the present invention, the CO2 adsorption portion is wool-like, which increases the surface area of ​​the CO2 adsorption portion, making it possible to separate and remove more CO2 from compressed air than with granular or sheet-like CO2 adsorption portions, and also making it possible to make the CO2 adsorption portion itself lighter, which contributes to reducing the weight of the air filter body.

[0020] Furthermore, in the air filter according to the present invention, the CO2 adsorption portion is in a sheet form, which simplifies the attachment of the CO2 adsorption portion to the filter element and improves the productivity of filter elements including the CO2 adsorption portion. Furthermore, the sheet form makes the thickness of the CO2 adsorption portion uniform, which contributes to facilitating adjustment of the amount of pressure drop caused by the CO2 adsorption portion.

[0021] Furthermore, according to the air filter of the present invention, the CO2 adsorption section is composed of multiple layers, and each layer has a different density, so that the CO2 adsorption by the CO2 adsorption section occurs in stages, which has the excellent effect of dispersing the CO2 adsorption sites and increasing the adsorption efficiency.

[0022] Furthermore, with the air filter of the present invention, compressed air entering through the inlet passes through the CO2 adsorption section and then the element, making it possible for dust and other particles contained in the compressed air to be captured by the CO2 adsorption section, thereby providing the excellent effect of preventing performance degradation due to dust adhesion to the element.

[0023] Furthermore, according to the compressed air pressure circuit of the present invention, an oil mist removal means is provided upstream of the air filter, which has the excellent effect of removing oil mist contained in the compressed air in advance and preventing a decrease in CO2 adsorption performance due to oil adhesion to the CO2 adsorption section.

[0024] Furthermore, according to the compressed air pressure circuit of the present invention, since the air compressor is oil-free, compressed air that does not contain oil mist flows in, which has the excellent effect of preventing a decrease in CO2 adsorption performance due to oil adhesion to the CO2 adsorption section. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is an overall view showing an embodiment of an air filter according to the present invention. [Figure 2] FIG. 2 is a cross-sectional view illustrating an air flow path in the air filter according to the present invention. [Figure 3] FIG. 4 is a cross-sectional view showing another embodiment of the air filter according to the present invention. [Figure 4] 1 is an explanatory diagram showing an embodiment of a compressed air pressure circuit using an air filter according to the present invention. [Figure 5] FIG. 10 is a cross-sectional view of a filter element showing another embodiment of the air filter according to the present invention. [Figure 6] 10A to 10C are cross-sectional views of a filter element illustrating a manufacturing process for another embodiment of the air filter according to DETAILED DESCRIPTION OF THE INVENTION

[0026] The greatest feature of the air filter 1 of the present invention is that it is equipped with a CO2 adsorption section 40 within the air filter in a compressed air pressure circuit, making it possible to separate and adsorb CO2 contained in compressed air without using any additional equipment. An embodiment of an air filter 1 according to the present invention will be described below with reference to the drawings. The air filter 1 according to the present invention is not limited to the embodiments described below, but can be modified as appropriate within the scope of the technical concept of the present invention, i.e., within the scope of the shape, dimensions, materials, etc. that can achieve the same functional effects.

[0027] FIG. 1 shows an embodiment of an air filter 1 according to the present invention, where (a) is an overall front view and a top view, (b) is an AA cross-sectional view, and (c) is an exploded cross-sectional view at the AA cross-section. FIG. 2 is a cross-sectional view illustrating the air flow path in the air filter 1 according to the present invention. FIG. 3 is a cross-sectional view showing another embodiment of the air filter 1 according to the present invention, and in detail is a cross-sectional view and a partially enlarged view illustrating the structure of the CO2 adsorption section 40 and the flow path of air that has flowed into the CO2 adsorption section 40. FIG. 4 shows an embodiment of a compressed air pressure circuit 2 using an air filter 1 according to the present invention, where (a) is an explanatory diagram of an embodiment in which an oil mist removal means 6 is disposed upstream of the air filter 1, and (b) is an explanatory diagram of an embodiment in which an oil-free air compressor 7 is disposed as the air compressor 3. Figure 5 shows axial and lateral cross-sectional views of a filter element illustrating another embodiment of an air filter according to the present invention, where (a) shows a case where the CO2 adsorption part is in sheet form, and (b) shows a case where a fixing rod is used to fix the CO2 adsorption part. FIG. 6 is a cross-sectional view in the axial direction of a filter element illustrating a manufacturing process for another embodiment of an air filter according to the present invention, showing the step of attaching a sheet-shaped CO2 adsorption portion to the filter element.

[0028] The air filter 1 is arranged in a compressed air pressure circuit and has the function of adsorbing CO2 in the compressed air, separating and removing foreign matter (hereinafter sometimes simply referred to as "foreign matter") such as dust, moisture, odors, and bacteria contained in the compressed air, and also recovering CO2. The air filter 1 is composed of a body 10, a bowl 20, a filter element 30, and a CO2 adsorption section 40. Compressed air sent from a compressed air pressure circuit flows in through an inlet 11 of the body 10 and passes through the CO2 adsorption section 40 and the filter element 30, thereby separating and removing foreign matter and CO2 contained in the compressed air, turning it into clean compressed air, which is then sent from an outlet 12 of the body 10 to downstream compressed air-using equipment. Air filters used in compressed air pressure circuits are classified according to their structure into an IN-OUT type, in which a compressed air flow path is formed from the inside to the outside of the filter element 30, as shown in Figure 1, and an OUT-IN type, not shown, in which a compressed air flow path is formed from the outside to the inside of the filter element 30. (In the case of the OUT-IN type, the compressed air inlet is 12 and the outlet is 11.) The air filter 1 according to the present invention is preferably an IN-OUT type, but is not particularly limited to this type. (The following description of the components of the air filter 1 and the notation in the drawings will be based on the IN-OUT type.)

[0029] The body 10 is provided for the purpose of connecting the air filter 1 to the compressed air pressure circuit 2 and forming a flow path within the air filter 1. The body 10 has an inlet 11 through which compressed air sent from the compressed air pressure circuit 2 flows into the air filter 1, an outlet 12 through which the compressed air in the air filter 1 is sent to the compressed air pressure circuit 2 or compressed air utilization equipment, a filter element mounting portion 13, and a bowl mounting portion 14, and an inlet flow path 15 and an outlet flow path 16 are formed as flow paths within the body 10. The filter element mounting portion 13 is provided for the purpose of mounting the filter element 30 by, for example, screwing or fitting, and is provided with an O-ring for sealing the elements together as needed. The bowl mounting portion 14 is provided for the purpose of mounting the bowl 20 by, for example, screwing or fitting, and, like the filter element mounting portion 13, is provided with an O-ring if necessary. The inlet flow path 15 is formed so that the compressed air flowing in from the inlet 11 flows into the inside of the filter element 30 . The outlet flow path 16 is formed to allow the compressed air that has passed through the filter element 30 and flowed into the bowl 20 to flow out from the outlet 12.

[0030] The bowl 20 is connected to the body 10, isolates the filter element 30 from the outside air, and constitutes a part of the flow path. Bowl 20 is a hollow cylindrical body with an open top and a closed bottom, and is attached to bowl attachment part 14 by, for example, screwing or fitting. Also, a preferred embodiment is one in which a drain outlet 21 is provided on the bottom of bowl 20. Drain outlet 21 is an outlet for discharging drainage that has flowed into air filter 1, drainage that has been generated inside, fallen dust, etc., and is connected to a manual valve or drain trap (not shown). By connecting the top surface of bowl 20 to body 10, a compressed air flow path is formed in which compressed air flows in from inlet 11, passes through the hollow part of bowl 20, and is sent to the subsequent stage from outlet 12.

[0031] The filter element 30 is a cylindrical body having an element 31 that separates and removes foreign matter contained in compressed air, and is attached to the body 10 . Filter element 30 is composed of element 31, which is a hollow cylinder with its upper and lower ends penetrated, and frame portions 32 provided at each end of element 31, and is configured to be at least smaller than the inner diameter of bowl 20 and shorter than the length of bowl 20. Frame portion 32 provided at the upper end of element 31 is configured to be connectable to filter element mounting portion 13, for example, by screwing or fitting. The element 31 is composed of a hollow cylindrical body, and removes foreign matter from the air by adsorbing it as compressed air passes through. Depending on the type of foreign matter to be adsorbed by the element 31, the filter element 30 is provided with different mesh sizes and materials that come into contact with the air. The filter element 30 of the present invention may be one that utilizes conventionally known technology and is selected appropriately depending on the type of foreign matter to be separated and removed from the compressed air. For example, a dust filter element that captures and separates dust, an oil mist filter element that captures and separates oil mist, or an activated carbon filter element that adsorbs odors may be used.

[0032] The CO2 adsorption section 40 separates and recovers CO2 from the compressed air that has flowed into the air filter 1. The CO2 adsorption section 40 is provided in the flow path of compressed air that flows into the air filter 1 from the inlet 11, and separates and captures the CO2 contained in the compressed air passing through the CO2 adsorption section 40.This makes it possible to send the compressed air from which CO2 has been captured to the subsequent stage without adding any new equipment or changing the equipment configuration.

[0033] The CO2 adsorption unit 40 can be installed in the hollow portion of the element 31, in the gap between the inner wall of the bowl 20 and the filter element 30, or both. However, when using the aforementioned IN-OUT type air filter, a preferred configuration is one in which the CO2 adsorption unit 40 is provided in the hollow portion of the element 31, so that the compressed air flowing in from the inlet 11 passes through the CO2 adsorption unit 40 and then contacts the element 31. This configuration allows the CO2 adsorption unit 40 to capture foreign matter contained in the compressed air in advance, thereby preventing clogging and performance degradation due to foreign matter adhering to the element 31. Furthermore, the CO2 adsorption function can be achieved without adding or modifying existing equipment, and the CO2 adsorption unit 40 can be replaced simultaneously with the filter element 30, simplifying installation and replacement procedures.

[0034] The CO2 adsorption and capture means in the CO2 adsorption unit 40 is not particularly limited and can be selected from existing means such as chemical absorption, physical absorption, and solid absorption. The material constituting the CO2 adsorption unit 40 is selected appropriately depending on the CO2 adsorption and capture means, and possible materials include amine compounds, ceramics, zeolite, and activated carbon. The use of such materials enables efficient CO2 adsorption and desorption, which also contributes to the reuse of the captured CO2. Furthermore, the shape of the CO2 adsorption unit 40 is not particularly limited, and various shapes such as granular, pellet, sheet, and wool are possible. For example, a wool-like configuration is preferred, as it has the largest surface area when contacting compressed air compared to other shapes and experiences low pressure loss when the compressed air passes through the CO2 adsorption unit 40. By adopting such a configuration, the contact area with the compressed air is increased, making it possible to adsorb more CO2 than with other shapes. Furthermore, because it is lighter than other shapes, it also contributes to reducing the weight of the CO2 adsorption unit 40 itself.

[0035] Other shapes of the CO2 adsorption section 40 include PP (polypropylene) fiber consisting of small pieces of about 3 to 5 mm each, or PP fiber consisting of string-like pieces with a thickness of about 5 to 10 mm, which are impregnated with a CO2 adsorbent. The use of small pieces increases the effective area for adsorption, and the use of strings makes the adsorbent easier to handle. In addition, in the case of a sheet-like form, the sheet material may be PP (polypropylene) fiber or nonwoven fabric.

[0036] The upper and lower ends of the CO2 adsorption section 40 are preferably provided with punching plates 41 to prevent the constituent materials from falling or entering the inlet 11. The punched plate 41 is a flat plate with a plurality of through-holes, and may be made of metal, resin, or any other material. With the CO2 adsorption unit 40 loaded in the middle, the punched plate 41 is provided to clamp the upper and lower ends of the CO2 adsorption unit 40 and prevent it from moving, for example, as shown in Fig. 1, so as to be fixed to the inner surface of the filter element 30. In this case, the holes in the punched plate 41 at the upper end are provided as a flow path for compressed air flowing into the air filter 1, while the holes in the punched plate 41 at the lower end may be provided as a flow path for discharging condensate separated from the compressed air in the CO2 adsorption unit 40 and as an emergency exhaust flow path in the event of exhaust failure due to clogging of the filter element 30. By reducing the number of holes or making the diameter of the holes in the punched plate 41 lower than the holes in the upper punched plate 41, the flow path from above to below is restricted during normal operation, making it easier to form a flow path for compressed air toward the element 31 located to the side.

[0037] Furthermore, the punching plate 41 may be fixed using a fixing rod 45 as shown in FIG. 5(b). It uses a fixed rod 45 with threaded portions at both ends, a frame portion 32 on the bottom side with a screw receiving portion, and a nut 46. A hole large enough to pass the fixed rod through is provided in the center of the punching plate 41. One end of the fixing rod 45 is screwed into the screw receiving portion of the frame portion 32 on the bottom side, the CO2 adsorption portion is filled, and one end of the fixing rod 45 is inserted into the hole in the punching plate 41 at the upper end. By fastening and fixing the upper end punching plate 41 with two nuts 46, the upper end punching plate 41 can be stably fixed at a constant distance from the bottom surface.

[0038] The fixed rod 45 may also be hollow with multiple holes drilled in the side to allow air to move inside the fixed rod 45. This allows air to pass through the CO2 adsorption section 40 evenly, reducing the amount of pressure drop caused by the CO2 adsorption section 40.

[0039] One possible configuration for the CO2 adsorption section 40 is to construct it as a single layer using the same material, but if such a configuration is adopted, it is expected that the compressed air flow path will be concentrated above the CO2 adsorption section 40, which is the shortest flow path, and in that case, it is expected that only a portion of the CO2 adsorption section 40 will be burdened, reducing the CO2 adsorption efficiency. Therefore, a preferred embodiment is one in which sheet-like CO2 adsorption units 40 made up of multiple layers of different densities are stacked vertically, as shown in Figure 3. In this case, by stacking the CO2 adsorption units 40 so that the density increases toward the element 31, even if CO2 is not adsorbed by a low-density adsorption unit 42, capture and adsorption will occur in the next layer, the medium-density adsorption unit 43, and the layer after that, the high-density adsorption unit 44. In this way, CO2 can be adsorbed in stages depending on the density of the layers, and this dispersion of CO2 adsorption sites reduces the overall load on the CO2 adsorption unit 40 and contributes to increasing CO2 adsorption efficiency.

[0040] Another method for placing the sheet-shaped CO2 adsorption section 40 inside the filter element 30 is to roll a sheet-shaped CO2 adsorption section 40 of a certain thickness and with a length approximately the same as the circumference of the inner diameter of the filter element 30 into a cylindrical shape and then attach it while deforming it. 6, the sheet-like CO2 adsorption portion 40 is shaped like a sheet with a certain thickness and a length roughly equal to the circumference of the inner diameter of the filter element 30 (FIG. 6(a)). The edges of the sheet have a strength sufficient to allow them to continue to abut against each other without deformation when they are biased in a direction that brings them into contact with each other. Next, as shown in FIG. 6(b), the sheet-shaped CO2 adsorption portion 40 is rolled up, the edges of the sheet overlap, and the entire sheet is deformed to be smaller than the inner diameter of the filter element 30. Next, as shown in FIG. 6( c ), the sheet-shaped CO2 adsorption portion 40 is inserted inside the filter element 30 . Next, the position of the sheet is adjusted so that the edges abut each other (Fig. 6(d)). By making the sheet thick to a certain extent, the force that tries to return it to a flat plate shape will cause it to adhere closely to the inner wall of the filter element 30, which is preferable as it reduces the possibility of deformation due to air flow, etc. In the case of OUT-IN, air flows from the filter element 30 toward the sheet-shaped CO2 adsorption section 40. The flow pressure at this time may cause the CO2 adsorption section 40 to deform inward. However, the abutment of both ends of the sheet prevents deformation of the CO2 adsorption section 40.

[0041] In this way, by having the CO2 adsorption portion 40 in a sheet form, the work of attaching the CO2 adsorption portion 40 to the filter element becomes simple, and the productivity of filter elements including the CO2 adsorption portion can be improved. Furthermore, by forming the CO2 adsorption portion into a sheet shape, the thickness of the CO2 adsorption portion becomes uniform, making it easier to adjust the amount of pressure drop caused by the CO2 adsorption portion.

[0042] As another example of the sheet-shaped CO2 adsorption unit 40, the sheet-shaped CO2 adsorption unit 40 may be conically shaped with an open tip. The tip of the cone is inserted into the inside of the filter element 30, and the base end of the cone is pressed against and abuts against the inside of the filter element. This makes it easier to fix the CO2 adsorption unit 40 to the inside of the filter element. Furthermore, the sheet-shaped CO2 adsorption portion 40 may be made bag-shaped. This prevents air from flowing from the bottom of the filter element 30 through the sheet-shaped CO2 adsorption portion 40, allowing for efficient CO2 adsorption. Also, the upper end of the sheet-like CO2 adsorption portion 40 may be fixed to the filter element mounting portion 13 of the body 10. With this structure, there is no need for a fixing portion on the filter element side, and an existing filter element can be used without any modification.

[0043] The CO2 adsorption performance of the CO2 adsorption material provided as the CO2 adsorption unit 40 may be reduced due to the adhesion of oil mist (oil) contained in the compressed air. Therefore, it is also preferable to provide an oil mist removal means 6 in the compressed air pressure circuit 2 before the air filter 1 to remove the oil mist contained in the compressed air in advance, or to provide an oil-free air compressor 7 as the air compressor 3 so that compressed air free of oil mist can be sent to the air filter 1 without installing any additional equipment.

[0044] The compressed air pressure circuit 2 is equipped with various devices, including an air compressor 3 that generates and supplies compressed air, an air tank 4, an air dryer 5, and an air filter 1 and other devices for separating and removing foreign matter contained in the compressed air. The air compressor 3 is located at the front end of the compressed air circuit 2. It compresses atmospheric air to generate pressurized compressed air and sends it to the rear end. The compressed air generated by the air compressor 3 contains foreign matter such as dust, water vapor, and oil mist. Therefore, as shown in Figure 4(a), various devices are installed downstream of the air compressor 3 to separate and remove the foreign matter contained in the compressed air. These devices may include an air tank 4 for temporarily storing the generated compressed air, an air dryer 5 for drying the compressed air to remove moisture, and an oil mist removal unit 6 for removing oil mist from the compressed air. However, these devices are not limited to these, and any devices commonly used in the compressed air circuit 2 may be installed as needed. Furthermore, if an oil-free air compressor 7 is used as the air compressor 3, various devices would be installed in a compressed air circuit without the oil mist removal unit 6, as shown in Figure 4(b). Naturally, air piping is provided at the connection points between the various devices that make up the compressed air circuit 2 and the air filter 1, and the compressed air generated by the air compressor 3 is sent to the various devices and the air filter 1 via the air piping, and then sent from the air filter 1 to downstream compressed air-using equipment via the air piping.

[0045] With respect to the air filter 1 according to the present invention having the above-described configuration, the operation of compressed air flowing into the air filter 1 will be described with reference to FIG. First, compressed air flows from inlet 11 through inlet passage 15 in body 10 into filter element 30. The compressed air that has flowed into filter element 30 first enters CO2 adsorption section 40 through holes opened in upper punching plate 41, and upon contact with CO2 adsorption section 40, the CO2 contained in the compressed air is separated and collected. The compressed air in CO2 adsorption section 40 then passes through element 31, where foreign matter is separated and removed, becoming purified. The air then passes through the gap between bowl 20 and filter element 30, and is discharged from outlet 12 via outlet passage 16 in body 10, and is sent to subsequent stages via air piping.

[0046] The basic configuration and operation / function of the air filter 1 according to the present invention have been described above, but the present invention is not limited to the configuration shown in the above embodiment or the drawings. For example, an air filter 1 having a CO2 adsorption unit 40 in a dust filter element that separates and removes dust may be provided downstream of another air filter 1 having a CO2 adsorption unit 40 in an activated carbon filter element that adsorbs odors. In this way, a CO2 adsorption unit 40 may be provided in each filter element disposed in the compressed air pressure circuit 2.

[0047] As described above, the air filter 1 and compressed air pressure circuit 2 of the present invention are provided with a CO2 adsorption section 40 within the air filter 1, so that compressed air sent into the air filter 1 passes through the CO2 adsorption section 40 and the element 31, and the clean compressed air from which the foreign matter contained in the compressed air has been separated and recovered can be sent to a downstream compressed air utilization device. This makes it possible to recover CO2 without adding any new equipment or changing the equipment configuration, thereby achieving the excellent effect of contributing to improving the global environment. [Industrial Applicability]

[0048] As an air filter capable of recovering CO2, the present invention is not limited to a specific field but can be used in compressed air circuits in all fields, and can provide clean compressed air while contributing to the reduction of CO2 released into the atmosphere and realizing a reduction in greenhouse gas emissions. Therefore, it is believed that the "air filter and compressed air circuit" according to the present invention has great industrial applicability. [Explanation of symbols]

[0049] 1 air filter 2 Compressed air pressure circuit 3. Air compressor 4. Air tank 5 Air dryer 6 Oil mist removal methods 7. Oil-free air compressor 10 Body 11 Inlet 12 Outlet 13 Filter element mounting part 14 Bowl mounting part 15 Inflow route 16 Outflow route 20 Bowls 21 Drain outlet 30 filter element 31 Elements 32 Frame 40 CO2 adsorption section 41 Punching plate 42 Low density adsorption part 43 Medium density adsorption section 44 High-density adsorption section 45 Fixed rod 46 Nut

Claims

1. An air filter disposed in a compressed air pressure circuit, a body, a filter element attached to the body, a bowl that isolates the filter element from the outside air, and a CO ２ an adsorption portion; The body has an inlet and an outlet for compressed air, The filter element is a cylindrical body having an element that removes foreign matter from the air. The compressed air that enters from the inlet is filtered through the CO ２ An air filter characterized in that air passes through an adsorption part and an element and is discharged from an outlet.

2. The CO ２ 2. The air filter according to claim 1, wherein the adsorption portion is provided in a hollow portion of the filter element.

3. The CO ２ 2. The air filter according to claim 1, wherein the adsorption portion is made of any one of an amine compound, ceramics, zeolite, and activated carbon.

4. The CO ２ 2. The air filter according to claim 1, wherein the adsorbent portion is wool-like.

5. The CO ２ 2. The air filter according to claim 1, wherein the adsorption portion is in the form of a sheet.

6. The CO ２ 2. The air filter according to claim 1, wherein the adsorption portion is made up of a plurality of layers, each layer having a different density.

7. The compressed air entering from the inlet is ２ 2. The air filter according to claim 1, wherein the air passes through the adsorption portion and then the element.

8. In a compressed air pressure circuit in which the air filter according to any one of claims 1 to 7 is installed, A compressed air pressure circuit characterized in that an oil mist removing means is disposed in front of an air filter.

9. In a compressed air pressure circuit in which the air filter according to any one of claims 1 to 7 is installed, A compressed air pressure circuit, characterized in that the air compressor is an oil-free type.

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