Multi-stage filtration high-pressure compressed-air purifier

Abstract

The present invention relates to a multi-stage filtration high-pressure compressed-air purifier and, more specifically, to a multi-stage filtration high-pressure compressed-air purifier in which an oil adsorption paper can be easily installed and fixed using a holder mesh provided in an inner housing, and in which auxiliary air inlets are provided along the circumferential direction of the inner housing to allow airflow to be improved in portions where airflow is insufficient, and which furthermore has a coupling structure that can prevent separation between the inner housing and a base plate due to impact.

Description

Multi-stage filtering high-pressure compressed air purifier

[0001] The present invention relates to a multi-stage filtering high-pressure compressed air purifier, and more particularly, to a multi-stage filtering high-pressure compressed air purifier having a holder mesh provided in an inner housing to easily install and fix an oil absorbent sheet, an auxiliary air inlet provided along the circumference of the inner housing to improve areas of insufficient air flow, and a joint structure that prevents separation due to impact between the inner housing and a base plate.

[0002] The electronic APU (Air Processing Unit) system is basically a system that filters out oil, foreign substances, and moisture contained in compressed air generated by an air compressor and then protects pneumatic devices that use the compressed air. As shown in Figure 1, it is generally composed of an air compressor, EAPU VALVE assembly, ECU, air tank, brake chamber, suspension bellows, sepcooler, and 3-way valve.

[0003] The configuration of the above electronic APU system is briefly described below.

[0004] The above air compressor is configured to receive an operating signal from the EAPU and supply compressed air to the air tank through the EAPU VALVE.

[0005] The above EAPU VALVE assembly is configured to receive vehicle information, intelligently control the air compressor, supply filtered air to each air tank, and intelligently control regeneration of the filter.

[0006] In particular, a high-pressure compressed air purifier is used in the EAPU VALVE assembly to filter oil, foreign substances, and moisture in the air flowing in from the air compressor.

[0007] The above ECU is a component that controls the vehicle's engine and electronic units.

[0008] The above air tank is configured to store filtered air for the operation of pneumatic functions such as suspension, braking, and parking brake of a commercial vehicle.

[0009] The above brake chamber is configured to operate the brake caliper using air pressure to generate braking force through friction between the disc and pad.

[0010] The above suspension bellows is configured to alleviate the up-and-down vibrations that occur when driving passengers and cargo located above the suspension system.

[0011] In the prior art, an 'intelligent EAPU module for commercial vehicles' was proposed in Korean Patent Publication No. 10-2022-0075784 (published on June 8, 2022).

[0012] However, the cartridge of the above-mentioned prior art has problems such as the cumbersome installation of an oil absorbent for oil absorption, the presence of areas with insufficient air flow, and leakage occurring at joints requiring airtightness due to impact, etc., which may cause oil / foreign substances / unmoistened air to be supplied directly to the vehicle, which may have a serious impact on the vehicle.

[0013] The present invention has been devised to solve the problems of the prior art as described above, and the purpose of the present invention is to provide a multi-stage filtering high-pressure compressed air purifier having a joint structure that facilitates installation and fixation of an oil absorbent material in a housing, allows smooth air flow inside, and prevents separation due to impact.

[0014] In order to achieve the above-described purpose, a multi-stage filtering high-pressure compressed air purifier according to the present invention comprises: an inner housing having an accommodation space formed therein, a main air inlet formed on the upper surface of the upper portion, an air outlet formed in the center of the bottom surface of the lower portion, a concave portion formed inwardly on the side surface of the lower portion, an installation space formed outside the concave portion, and a cylindrical adsorption paper winding portion provided in the installation space; an outer housing that surrounds the inner housing from the outside and forms an air flow path in a gap with the inner housing so that compressed air introduced from an air compressor flows toward the main air inlet through the installation space; an oil filtering means provided with an oil adsorption paper that is installed in the installation space and filters oil in the air passing therethrough; And a moisture filtering means having a desiccant for filtering moisture of air received and passing through the receiving space; wherein the oil filtering means is formed in a cylindrical shape larger than the diameter of the absorbent paper winding portion, is formed in a mesh structure that allows air to flow inward and outward, is formed in a cylindrical shape larger than the diameter of the absorbent paper winding portion, and includes a holder mesh that has an inner surface in surface contact with the absorbent paper while the absorbent paper is wound in a roll shape on the absorbent paper winding portion and fixes and supports the absorbent paper, and the inner housing is characterized in that an auxiliary air inlet is formed along the circumferential direction on a side surface at an upper position of the concave portion.

[0015] Here, the inner housing is characterized in that it has fitting grooves formed in a certain pattern along the circumference at the upper and lower ends of the suction cup mounting portion, and the holder mesh is provided with fitting protrusions that are fitted into the fitting grooves at the upper and lower ends, respectively, and includes a plurality of holder units bent in an arc shape to form a cylindrical shape by mutual combination.

[0016] Here, the holder mesh is characterized by including a flange ring in the shape of a circular band made of a flexible material; and a plurality of holder units whose lower ends are continuously connected radially along the circumferential direction of the flange ring so that the upper ends can be mutually separated, and whose upper ends are mutually gathered by an external force and form a cylindrical shape by combination.

[0017] Here, the holder mesh is characterized in that it further has a plurality of space-securing ribs that protrude at regular intervals along the circumferential direction on the outer surface to secure the air flow path and are supported by being in contact with the inner surface of the outer housing.

[0018] In addition, the multi-stage filtering high-pressure compressed air purifier according to the present invention is characterized by further including a base plate that is sealed and joined to the lower portion of the inner housing and the outer housing, has an air outlet formed in the center that is connected to the air discharge port, and has a plurality of air inlets formed along a circumferential direction to the outside of the air outlet that are connected to the air flow path.

[0019] Here, the inner housing is characterized in that it includes a plate-joining portion that is coupled to the base plate at the bottom, the plate-joining portion has a tension support member that has a predetermined length at a position corresponding to the air inlet of the base plate and protrudes to the bottom of the inner housing and is inserted into the air inlet; and a fixing hook formed at the front end of the tension support member so that it can be fixed by being caught on the inner lower surface of the air inlet when the insertion of the tension support member is completed.

[0020] Here, the tension support is characterized in that it is formed by a plurality of columns having a certain length, and the fixed hook is formed by interconnecting the tips of the plurality of columns.

[0021] By the above configuration, the multi-stage filtering high-pressure compressed air purifier according to the present invention has the advantages of easy installation and fixation of the oil absorbent material in the housing, smooth air flow inside, and prevention of separation due to impact.

[0022] Figure 1 is a configuration diagram of a typical electronic APU system.

[0023] Figure 2 is an exploded perspective view of a multi-stage filtering high-pressure compressed air purifier according to one embodiment of the present invention.

[0024] Figure 3 is a partially cut-away perspective view of a multi-stage filtering high-pressure compressed air purifier according to an embodiment of the present invention.

[0025] Figure 4 is a partially cut-away exploded perspective view of an inner housing according to one embodiment of the present invention.

[0026] Figure 5 is a perspective view of a holder mesh according to an embodiment of the present invention.

[0027] Figure 6 is a partial perspective view showing a cross-section of a main part according to one embodiment of the present invention.

[0028] Figure 7 is an image of the air flow analysis result of the internal housing according to the prior art.

[0029] Figure 8 is an image of the air flow analysis result of the inner housing according to one embodiment of the present invention.

[0030] Figure 9 is a performance comparison graph of a high-pressure compressed air purifier according to an embodiment of the present invention and a conventional technology.

[0031] Figure 10 is a perspective view showing the combined state of a multi-stage filtering high-pressure compressed air purifier according to one embodiment of the present invention.

[0032] Figure 11 is a cross-sectional view of the main parts of a multi-stage filtering high-pressure compressed air purifier according to an embodiment of the present invention.

[0033] Figure 12 is a bottom perspective view of an inner housing according to one embodiment of the present invention.

[0034] Fig. 13 is a perspective view of a holder mesh according to another embodiment of the present invention.

[0035] Figure 14 is a perspective view showing the combined state of a multi-stage filtering high-pressure compressed air purifier according to another embodiment of the present invention.

[0036] A multi-stage filtering high-pressure compressed air purifier according to the present invention comprises: an inner housing having an accommodation space formed therein, a main air inlet formed on the upper surface of an upper portion, an air outlet formed in the center of a bottom surface of a lower portion, a concave portion formed inwardly on a side surface of the lower portion, an installation space formed outside the concave portion, and a cylindrical adsorption paper winding portion provided in the installation space; an outer housing that surrounds the inner housing from the outside and forms an air flow path in a gap with the inner housing so that compressed air introduced from an air compressor flows toward the main air inlet through the installation space; an oil filtering means provided with an oil adsorption paper that is installed in the installation space and filters oil in the air passing therethrough; And a moisture filtering means having a desiccant for filtering moisture of air received and passing through the receiving space; wherein the oil filtering means is formed in a cylindrical shape larger than the diameter of the absorbent paper winding portion, is formed in a mesh structure that allows air to flow inward and outward, is formed in a cylindrical shape larger than the diameter of the absorbent paper winding portion, and includes a holder mesh that has an inner surface in surface contact with the absorbent paper while the absorbent paper is wound in a roll shape on the absorbent paper winding portion and fixes and supports the absorbent paper, and the inner housing is characterized in that an auxiliary air inlet is formed along the circumferential direction on a side surface at an upper position of the concave portion.

[0037] Hereinafter, a multi-stage filtering high-pressure compressed air purifier according to the present invention will be described in more detail with reference to an embodiment illustrated in the drawings.

[0038] FIG. 2 is an exploded perspective view of a multi-stage filtering high-pressure compressed air purifier according to an embodiment of the present invention, FIG. 3 is a partially cut-away perspective view of a multi-stage filtering high-pressure compressed air purifier according to an embodiment of the present invention, FIG. 4 is a partially cut-away perspective view of an inner housing according to an embodiment of the present invention, FIG. 5 is a perspective view of a holder mesh according to an embodiment of the present invention, FIG. 6 is a partial perspective view showing a cross-section of a main part according to an embodiment of the present invention, FIG. 7 is an image of an air flow analysis result of an inner housing according to a prior art, FIG. 8 is an image of an air flow analysis result of an inner housing according to an embodiment of the present invention, FIG. 9 is a performance comparison graph of a high-pressure compressed air purifier according to an embodiment of the present invention and a prior art, FIG. 10 is a perspective view showing a combined state of a multi-stage filtering high-pressure compressed air purifier according to an embodiment of the present invention, and FIG. 11 is a graph showing a performance comparison graph of a multi-stage filtering high-pressure compressed air purifier according to an embodiment of the present invention. This is a cross-sectional view showing the main parts of a multi-stage filtering high-pressure compressed air purifier according to one embodiment, FIG. 12 is a bottom perspective view of an inner housing according to one embodiment of the present invention, FIG. 13 is a perspective view of a holder mesh according to another embodiment of the present invention, and FIG. 14 is a perspective view showing a combined state of a multi-stage filtering high-pressure compressed air purifier according to another embodiment of the present invention.

[0039] Looking at FIGS. 2 and 3, a multi-stage filtering high-pressure compressed air purifier according to one embodiment of the present invention includes an inner housing (10), an outer housing (20), an elastic spring (30), an oil filtering means (40), a moisture filtering means (50), and a base plate (60).

[0040] The inner housing (10) above has a receiving space (11) formed therein, a main air inlet (121) formed on the upper surface of the upper part, an air outlet (13) formed in the center of the bottom surface of the lower part, and a concave portion (14) formed inwardly on the side surface of the lower part, so that an installation space (15) is formed outside the concave portion (14). In one embodiment of the present invention, the inner housing (10) includes a receiving space (11), an upper surface cap (12), an air outlet (13), a concave portion (14), an installation space (15), a suction cup winding portion (16), a fitting groove (17), an auxiliary air inlet (18), and a plate joint portion (19).

[0041] The above-mentioned receiving space (11) is formed inside the inner housing (10), and a desiccant (51) as a moisture filtering means (50) is filled in the receiving space (11).

[0042] The bottom surface of the above-mentioned receiving space (11) may be provided with a porous fabric sheet (not shown) such as non-woven fabric that prevents the pulverized material of the filled desiccant (51) from entering the air outlet (13) formed on the bottom surface of the inner housing (10) and also filters out contaminants contained in the compressed air.

[0043] The above upper surface cap (12) is supported so as to be able to move up and down on the upper part of the receiving space (11), has a main air inlet (121) formed on the upper surface, and is configured to be elastically pressed downward by an elastic spring (30).

[0044] That is, the upper surface cap (12) has a main air inlet (121) formed on the upper surface so that compressed air flowing in from an air compressor can flow into the receiving space (11) through an air flow path (21), and is configured to be supported so as to be able to move up and down, and is configured to elastically support the desiccant (51) filled in the receiving space (11) downwards by a combination with an elastic spring (30) to be described later, thereby effectively fixing the desiccant (51) even when the desiccant (51) decreases.

[0045] Meanwhile, the main air inlet (121) is connected to the air inlet (62) of the base plate (60) via the air flow path (21).

[0046] The above air outlet (13) is formed in the center of the bottom surface of the inner housing (10) so that air passing through the receiving space (11) can be discharged to the outside.

[0047] Meanwhile, the air exhaust port (13) is connected to the air outlet (61) of the base plate (60).

[0048] The above concave portion (14) is formed to be inserted inwardly into the upper or lower side of the inner housing (10), so that an installation space (15) is formed on the outside thereof in which an oil filtering means (40) can be installed.

[0049] In one embodiment of the present invention, the concave portion (14) is configured to be formed at the lower end of the inner housing (10) so that the air inlet (62) of the base plate (60) can be directly connected to the installation space (15).

[0050] That is, in one embodiment of the present invention, compressed air provided from an air compressor is configured to first pass through an oil filtering means (40) installed in the installation space (15) after being introduced into the air inlet (62) of the base plate (60).

[0051] The above-mentioned adsorption paper winding part (16) is formed in a cylindrical shape so that the oil adsorption paper (41) as an oil filtering means (40) can be wound and supported in a roll shape in the above-mentioned installation space (15).

[0052] In one embodiment of the present invention, the lower part of the suction cup winding part (16) is configured to contact the base plate (60) at an outer position of the air inlet (62) formed on the base plate (60) while maintaining a seal using an O-ring (63), as shown in FIG. 14.

[0053] By the above configuration, the compressed air flowing into the air inlet (62) of the base plate (60) from the air compressor does not leak from the installation space (15) and passes through the oil absorbent paper (41) wound around the absorbent paper winding part (16), so that oil and foreign substances can be reliably filtered.

[0054] The above fitting groove (17) is formed in a certain pattern along the circumference direction at the upper and lower ends of the above suction cup winding part (16), and is configured to be fitted with the joining projection (421) of the holder mesh (42) described later.

[0055] The above auxiliary air inlet (18) is configured to assist the main air inlet (12) so that compressed air flowing in from the air compressor can flow into the receiving space (11) with the air flow shown by the arrow in Fig. 3, and is configured to be formed along the circumferential direction of the inner housing (10) on the upper side of the concave portion (14).

[0056] That is, when compressed air that flows into the main air inlet (121) in the inner housing (10) passes through the receiving space (11) and is then discharged through the air outlet (13), an area of ​​insufficient air flow occurs inside the receiving space (11). In order to improve this air flow problem, in one embodiment of the present invention, an auxiliary air inlet (18) is formed in addition to the main air inlet (121).

[0057] Figure 7 (a) illustrates the air flow in the filtering direction of the inner housing according to the prior art in which the auxiliary air inlet (18) is not formed, and Figure 7 (b) illustrates the air flow in the regeneration direction on the contrary.

[0058] Looking at Figure 7, it can be seen that in the case of the prior art in which the auxiliary air inlet (18) is not formed in the inner housing (10), an area of ​​insufficient air flow is formed at the upper position of the concave portion (14) inside the receiving space (11) of the inner housing (10).

[0059] That is, as shown in (a) of Fig. 7, the flow analysis results during purification operation confirm that a flow stagnation zone (area of ​​insufficient air flow) occurs at the “ㄱ” bend, and it is expected that this phenomenon will worsen due to flow obstruction when the dehumidifier is injected, ultimately reducing the dehumidification performance.

[0060] In addition, as shown in (b) of Fig. 7, when the regeneration operation is performed, a flow stagnation section is generated at the “ㄱ” bend section as a result of the flow analysis, and it is expected that the regeneration efficiency will decrease as moisture and foreign substances become stuck in this stagnation section.

[0061] Figure 8 (a) illustrates the air flow in the filtering direction of the inner housing according to one embodiment of the present invention in which an auxiliary air inlet (18) is formed, and Figure 8 (b) illustrates the air flow in the regeneration direction in the opposite direction.

[0062] Looking at Figure 8, it can be seen that the air flow is improved in the area by forming an auxiliary air inlet (18) on the upper side of the concave portion (14).

[0063] That is, as shown in (a) of Fig. 8, the flow analysis result during purification operation is expected to improve the overall dehumidification performance as the flow stagnation section (area of ​​insufficient air flow) is resolved compared to (a) of Fig. 7.

[0064] In addition, as shown in (b) of Fig. 8, when the regeneration operation is performed, the flow analysis results show that the flow stagnation section is resolved compared to (b) of Fig. 7, and the phenomenon of moisture and foreign substances sticking is prevented, so the overall regeneration efficiency is expected to be improved.

[0065] Figure 9 is a performance comparison graph of a high-pressure compressed air purifier according to an embodiment of the present invention and a conventional technology.

[0066] Looking at Fig. 9, it can be confirmed that the high-pressure compressed air purifier according to one embodiment of the present invention, in which an auxiliary air inlet (18) is formed, stably absorbs more moisture than the conventional technology under the same conditions, and maintains continuous drying performance even in a long-term operating environment.

[0067] Through this, the multi-stage filtering high-pressure compressed air purifier according to the present invention has the effect of slowing down the saturation rate of the desiccant (51) accommodated in the accommodation space (11), extending the filter replacement cycle, and providing better maintenance efficiency and reliability to the operator.

[0068] The above plate joint (19) is provided at the lower part of the inner housing (10) and is configured to be joined to the base plate (60). It is configured to have a structure that is joined to the air inlet (62) of the base plate (60) so that it can be joined without performing separate processing on the base plate (60).

[0069] In one embodiment of the present invention, the plate joint (19) includes a tension support member (191) that has a predetermined length and protrudes downward from the inner housing (10) at a position corresponding to the air inlet (62) of the base plate (60) as shown in FIG. 11 and is inserted into the air inlet (62), and a fixing hook (192) formed at the front end of the tension support member (191) so that the tension support member (191) can be fixed by being caught on the inner lower surface of the air inlet (62) when the insertion of the tension support member (191) is complete.

[0070] The above plate joint (191) has a structure that does not come off after being pressed into each other when the inner housing (10) and the base plate (60) are joined, thereby facilitating the joining and preventing any gap from occurring, thereby preventing leakage at the part where the O-ring (63), which is a connection part requiring airtightness, is mounted between the inner housing (10) and the base plate (60), thereby enabling the performance of the compressed air purifier according to the present invention to be continuously maintained.

[0071] In particular, in one embodiment of the present invention, the plate joint (191) is configured such that the tension support (191) is formed of a plurality of pillars (191a, 191b) having a predetermined length, as illustrated in FIG. 12, and the fixing hook (192) is formed by interconnecting the ends of the plurality of pillars (191a, 191b).

[0072] By the above configuration, the tension support member (191) can secure a tension section having a length capable of withstanding a certain degree of tension, and since the tension support member (191) is composed of a plurality of columns (191a, 191b), the applied tension can be distributed, thereby preventing the fixed hook (192) from being broken due to the tension that is inevitably generated during the process of being inserted into the air inlet (62).

[0073] The above outer housing (20) is configured to form the outer shape of the multi-stage filtering high-pressure compressed air purifier according to the present invention, and is installed to surround the inner housing (10) from the outside. It is configured to form an air flow path (21) in the gap with the inner housing (10) so that compressed air flowing in from the air compressor flows toward the main air inlet (121) through the installation space (15).

[0074] The above outer housing (20) is preferably designed to have an internal pressure structure that can withstand a pressure of 17 bar, and is connected to the base plate (60) while maintaining a lower seal by the plate seaming cap (64) of the base plate (60).

[0075] As described above, the elastic spring (30) is configured to be installed between the upper surface cap (12) of the outer housing (20) and the inner housing (10) so as to elastically pressurize the desiccant (51) filled in the receiving space (11) using the upper surface cap (12).

[0076] The above oil filtering means (40) is installed in the installation space (15) and is configured to filter oil and foreign substances in the air passing through, and in one embodiment of the present invention, includes an oil absorbent (41) and a holder mesh (42).

[0077] The above-mentioned oil absorbent (41) is supported on the inner surface of the holder mesh (42) and is configured to filter oil and foreign substances in the passing air. In one embodiment of the present invention, it is configured to be wound in a roll shape on the absorbent paper winding part (16) of the inner housing (10), so that the installation of the oil absorbent (41) is easy.

[0078] The above holder mesh (42) is formed in a shape that can wrap around the concave portion (14) of the inner housing (10) from the outside in the installation space (15) and is configured to fix and support the absorbent material (41).

[0079] FIG. 5 shows a perspective view of a holder mesh (42) according to one embodiment of the present invention.

[0080] According to one embodiment of the present invention, the holder mesh (42) is formed in a cylindrical shape larger than the diameter of the absorbent paper winding portion (16), as shown in FIG. 5, and is formed in a mesh structure that allows air to flow inward and outward, and is provided with a connecting projection (421) that is fitted into the fitting groove (17) at the upper and lower ends, respectively, so that the inner surface of the absorbent paper is in surface contact with the absorbent paper (41) while the absorbent paper is wound in a roll shape around the absorbent paper winding portion (16) and the absorbent paper (41) is fixed.

[0081] In one embodiment of the present invention, the holder mesh (42) is formed of a plurality of holder units (42a) bent in an arc shape to form a cylindrical shape by mutual combination, and the coupling protrusions (421) are provided at the upper and lower ends of each side of the holder unit (42a), so that each holder unit (42a) can be easily fitted into the fitting groove (17) of the inner housing (10) through the coupling protrusions (421) forming a “ㄷ” shape.

[0082] Meanwhile, in one embodiment of the present invention, the holder mesh (42) is provided with a plurality of space securing ribs (422) that protrude at regular intervals along the circumferential direction on the outer surface and are supported by contacting the inner surface of the outer housing (20), thereby preventing the holder mesh (42) from coming off and at the same time securing the air flow path (21) to ensure smooth air flow.

[0083] Meanwhile, FIG. 13 shows a perspective view of a holder mesh (42) according to another embodiment of the present invention.

[0084] In another embodiment of the present invention, the holder mesh (42) is formed in a cylindrical shape larger than the diameter of the absorbent paper winding portion (16) provided in the inner housing (10) as shown in FIG. 13, and the absorbent paper (41) is wound in a roll shape around the absorbent paper winding portion (16) so that the inner surface is in surface contact with the absorbent paper (41) and is configured to fix and support the absorbent paper (41).

[0085] In addition, the holder mesh (42) according to another embodiment of the present invention is composed of a flange ring (423), a plurality of holder units (42b), and a rotating projection (424).

[0086] The above flange ring (423) is configured to support the lower portions of multiple holder units (42b) in a rotatably up and down direction in a circular band shape made of a flexible material.

[0087] The holder unit (42b) is configured such that the lower portions are connected radially and continuously along the circumference of the flange ring (423) in multiple pieces, so that the upper portions can be mutually separated as shown in Fig. 13, and the upper portions are mutually gathered by an external force to form a cylindrical shape by combination.

[0088] The above holder mesh (42) is important for stably fixing the absorbent paper (41) in order to repeatedly operate filtering and regeneration for the purpose of the product. Since the plurality of holder units (42b) are arranged radially, it can have structural rigidity and stably fix the absorbent paper (41) by evenly pressing it from all sides.

[0089] The above-mentioned rotating protrusions (424) are configured to protrude downward at positions corresponding to each of the plurality of holder units (42b) along the circumferential direction of the flange ring (423) and have curved tip portions.

[0090] As shown in Fig. 14, when the inner housing (10) moves downward and is coupled to the base plate (60) by the configuration of the holder mesh (42) as described above, the tip of the rotational projection (424) comes into contact with the upper surface of the base plate (60), and the plurality of holder units (42b) rotate in a direction in which the upper ends meet each other based on the rotational projection (424), thereby forming a cylindrical shape through combination.

[0091] That is, another embodiment of the present invention has a structure in which the plurality of holder units (42b) rotate in a direction in which the absorbent pad (41) can be fixed in conjunction with the movement of the inner housing (10) moving downward and being coupled to the base plate (60), thereby enabling the absorbent pad (41) to be easily installed and fixed.

[0092] The above moisture filtering means (50) is configured to filter moisture in the air that passes through the receiving space (11).

[0093] The above moisture filtering means (50) may be composed of a desiccant (51) such as zeolite filled in the receiving space (11).

[0094] The above base plate (60) is configured to be sealed by an O-ring (63) and a plate seaming cap (64) respectively being joined to the lower portions of the inner housing (10) and the outer housing (20), an air outlet (61) connected to the air discharge port (13) is formed in the center, a plurality of air inlets (62) connected to the air flow path (21) are formed along the circumferential direction on the outside of the air outlet (61), and a gasket (65) is provided on the lower surface of the plate seaming cap (64).

[0095] The above base plate (60) is a configuration generally used in multi-stage filtering high-pressure compressed air purifiers, but in the present invention, as described above, the plate joint (60) of the inner housing (10) is configured to be coupled to the air inlet (62), so that the inner housing (10) can be coupled without being separated even by impact without performing separate processing on the base plate (60), thereby preventing leakage at the portion where the O-ring (63), which is a connection portion requiring airtightness, is mounted between the inner housing (10) and the base plate, thereby enabling the performance of the multi-stage filtering high-pressure compressed air purifier according to the present invention to be continuously maintained.

[0096] The multi-stage filtering high-pressure compressed air purifier described above and illustrated in the drawings is merely one embodiment for implementing the present invention and should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is defined solely by the matters set forth in the following claims, and embodiments that are improved and modified without departing from the gist of the present invention shall be deemed to fall within the scope of protection of the present invention, provided that such modifications would be obvious to a person skilled in the art to which the present invention pertains.

[0097]

[0098] [Explanation of symbols]

[0099] 10 Internal housing

[0100] 11 Reception space

[0101] 12 Top cap

[0102] 13 Air exhaust port

[0103] 14 concave

[0104] 15 Installation space

[0105] 16 Adsorption paper attachment

[0106] 17 Insertion groove

[0107] 18 Auxiliary air inlet

[0108] 19 Plate joint

[0109] 191 Tension support

[0110] 192 fixed hook

[0111] 20 External Housing

[0112] 21 Airflow Path

[0113] 30 elastic springs

[0114] 40 Oil filtering means

[0115] 41 Absorbent paper

[0116] 42 Holder Mesh

[0117] 42a, 42b Multiple holder units

[0118] 421 connecting projection

[0119] 422 Space-saving rib

[0120] 423 flange ring

[0121] 424 Rotating protrusion

[0122] 50 Moisture filtering means

[0123] 51 Dehumidifier

[0124] 60 baseplate

[0125] 61 Air Outlet

[0126] 62 Air Inlet

Claims

1. An inner housing in which an accommodation space is formed inside, a main air inlet is formed on the upper surface of the upper part, an air outlet is formed in the center of the bottom surface of the lower part, a concave part is formed inwardly on the side of the lower part, an installation space is formed on the outside of the concave part, and a cylindrical suction pad mounting part is provided in the installation space; An outer housing that surrounds the inner housing from the outside and forms an air flow path through a gap with the inner housing so that compressed air flowing in from an air compressor flows toward the main air inlet through the installation space; An oil filtering means having an oil absorbent material installed in the above installation space to filter oil in the air passing through; and A moisture filtering means having a desiccant for filtering moisture in air passing through and being received in the above-mentioned receiving space; The above oil filtering means, It is formed in a cylindrical shape larger than the diameter of the above-mentioned adsorption paper winding portion, and is formed in a mesh structure that allows air to flow in and out, and is formed in a cylindrical shape larger than the diameter of the above-mentioned adsorption paper winding portion, and includes a holder mesh that has an inner surface in surface contact with the adsorption paper while the adsorption paper is wound in a roll shape on the adsorption paper winding portion and fixes and supports the adsorption paper. The above inner housing is, A multi-stage filtering high-pressure compressed air purifier characterized in that an auxiliary air inlet is formed along the circumferential direction on the upper side of the above concave portion.

2. In paragraph 1, The above inner housing is, A groove is formed in a certain pattern along the circumference at the top and bottom of the above-mentioned suction cup mounting portion, The above holder mesh is, A multi-stage filtering high-pressure compressed air purifier characterized by including a plurality of holder units having a coupling projection fitted into the fitting grooves at the top and bottom, respectively, and bent in an arc shape to form a cylindrical shape by mutual combination.

3. In paragraph 1, The above holder mesh is, A flange ring in the form of a circular band made of a flexible material; and A multi-stage filtering high-pressure compressed air purifier characterized by including a plurality of holder units in which the lower portions are continuously connected radially along the circumference of the flange ring so that the upper portions can be mutually opened, and the upper portions are mutually brought together by an external force and formed into a cylindrical shape by combination.

4. In paragraph 2 or 3, The above holder mesh is, A multi-stage filtering high-pressure compressed air purifier characterized in that a plurality of space securing ribs are further provided that protrude at regular intervals along the circumferential direction on the outer surface to secure the above air flow path and are supported by being in contact with the inner surface of the outer housing.

5. In any one of paragraphs 1 to 3, The above multi-stage filtering high-pressure compressed air purifier, A multi-stage filtering high-pressure compressed air purifier characterized by further comprising a base plate that is sealed and connected to the lower portion of the inner housing and the outer housing, has an air outlet formed in the center that is connected to the air discharge port, and has a plurality of air inlets formed along the circumferential direction to the outside of the air outlet that are connected to the air flow path.

6. In paragraph 5, The above inner housing is, A plate joint is provided at the bottom to be joined to the base plate, The above plate joint is, A tension support member having a certain length and protruding from the lower portion of the inner housing at a position corresponding to the air inlet of the base plate and inserted into the air inlet; and A multi-stage filtering high-pressure compressed air purifier characterized by including a fixing hook formed at the tip of the tension support so that the tension support can be fixed by being hooked onto the inner lower surface of the air inlet when the insertion of the tension support is completed.

7. In paragraph 6, The above tension support is, It consists of multiple columns of a certain length, The above fixed hook is, A multi-stage filtering high-pressure compressed air purifier characterized in that the plurality of pillar tips are formed by interconnecting each other.

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