JP2014237094A - Filter device for compressed air - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter device for compressed air which is configured so that it can advantageously remove not only vapor and liquid or solid fine particles but also inclusions such as microorganisms and bacteria existing in compressed air and can advantageously ensure the strength of filter means.SOLUTION: In a filter device 10 for compressed air comprising first filter means 12, second filter means 14, and third filter means 20 which is a separate body from the second filter means 14, the third filter means 20 is configured to include a cylindrical member 56, a membrane member 58, and an air collection part 60, and each of air introduction holes 78 formed in a cylindrical wall 64b of the cylindrical member 56 is configured in a hole structure where at least a part of a hole inner surface of the air introduction hole 78 is an inclined surface 80 inclined inward of the hole from the outer surface side to the inner surface side of the cylindrical wall 64b.

Description

  The present invention relates to a filter device for compressed air, and in particular, it can advantageously remove inclusions such as vapor, liquid or solid particulates present in compressed air, and advantageously ensure the strength of the filter means. It is related with the filter apparatus for compressed air comprised so that it could be done.

  Conventionally, on a flow path for supplying compressed air to various pneumatic equipment used in various factories, medical fields, nuclear power plants, etc., these pneumatic equipment are usually protected or work by these pneumatic equipment. In order to improve or improve the quality of the air, a filter device for compressed air is provided, and the filter device removes contaminants such as moisture, oil, and dust contained in the compressed air, thereby producing clean compressed air. The air is supplied to a predetermined pneumatic device.

  As one of such compressed air filter devices, there is a compressed air filter device as shown in Utility Model Registration No. 2543671 (Patent Document 1), Japanese Patent No. 3771289 (Patent Document 2), or the like. ,Proposed. There, the compressed air from the compressor is passed through the first filter means in the apparatus to remove solid particles present in the compressed air, and the vapor or liquid fine particles are condensed or combined, After being separated from the compressed air, the compressed air is passed through the second filter means so that the liquid particles and solid particles remaining in the compressed air are separated by filtration and adsorbed or vaporized. The vapor or liquid fine particles and solid fine particles in the air are reduced as much as possible, and further, the vapor or liquid particles slightly remaining in the compressed air are separated on the downstream side of the second filter means. A configuration in which a mist filter for caulking is provided is employed.

  However, in such a compressed air filter device, it has been difficult to remove very fine particles, microorganisms and bacteria present in the compressed air. In addition, in the previous Patent Document 2, although there is a description that a fine mist filter capable of capturing microorganisms is provided, in view of its structure, it is possible to reliably remove very fine particles, microorganisms and bacteria. Was difficult.

  For this reason, in order to cope with such a problem, in JP-A-8-323124 (Patent Document 3), as a third filter means replacing the mist filter disposed on the downstream side of the second filter means, It has been proposed to use a hollow fiber-like porous membrane. However, in this case, such a hollow fiber-like porous membrane is accommodated in a holding case in a state of being bent in a loop shape (U-shape) and bundled together with a second filling as a second filter means. In addition to being subjected to local restrictions on the arrangement of the hollow fiber-like porous membrane and the formation of the air passage, the compressed air from the second filter means Since the introduction of only the lower opening of the holding case is not possible, a large ventilation area cannot be taken, and there are problems such as an increase in pressure loss and a decrease in the flow rate of compressed air. Moreover, since the hollow fiber-like porous membrane is pressed by the compressed air that is circulated and is compressed (compressed), there is an inherent problem that the air flow rate (flow rate) is reduced. there were.

  However, in order to increase the ventilation area and thus the ventilation rate, the third filter means is separated from the second filter means, and a hollow fiber-like porous membrane as such third filter means is accommodated. When opening a large number of ventilation holes to the cylindrical wall portion of the case and increasing the opening area of the case cylindrical wall portion, in addition to the need for forming the ventilation holes for the case, When the ratio of the non-opening portion of the case cylindrical wall portion is reduced, the strength of the case itself is significantly reduced. Therefore, when a large stress or load or impact is applied during installation or handling of the third filter means. In addition, there is a problem that the case may be deformed or damaged.

Utility Model Registration No. 2543671 Japanese Patent No. 3771289 JP-A-8-323124

  Here, the present invention has been made in the background of such circumstances, and the problem to be solved is vapor, liquid or solid particulates present in compressed air, and microorganisms and bacteria. It is an object of the present invention to provide a compressed air filter device that can advantageously remove inclusions such as the above and can advantageously ensure the strength of the filter means.

  And in this invention, in order to solve such a subject, the 1st filter means which has the 1st filling in a cylinder, the 2nd filter means which has the 2nd filling in a cylinder, Is disposed in a trapping chamber having a predetermined volume, and the compressed air is introduced into the trapping chamber through the first filter means from the introduction pipe line, whereby vapor, liquid or solid present in the compressed air is introduced. The inclusions such as particulates are separated while the compressed air subjected to such separation treatment is guided from the trapping chamber to the second filter means. Inclusions remaining in the second filter means are captured by the second filter means, and further, a third filter separate from the second filter means is provided on the flow path of the compressed air delivered from the second filter means. Means for providing the compression In the compressed air filter device in which the inclusions still remaining in the compressed air are further trapped by allowing air to pass through the third filter means, a large number of the third filter means are provided on the cylindrical wall. A cylindrical member provided with an air delivery port at the bottom, a membrane member made up of a plurality of hollow fiber membranes accommodated in the cylindrical member, and the cylindrical member Formed in the internal space on the air delivery port side, the hollow portion of the hollow fiber membrane in the membrane member is opened, and the compressed air that has passed through the hollow fiber membrane is collected and led to the air delivery port An air introduction hole provided in the cylindrical wall of the cylindrical member, and at least a part of the inner surface of the hole is inclined inward from the outer surface side to the inner surface side of the cylindrical wall. To the hole structure The flow of compressed air delivered from the second filter means is introduced into the cylindrical member through an air introduction hole provided in the cylindrical wall of the cylindrical member, and the membrane member is hollow. A basic structure is a compressed air filter device that is configured to allow passage through a thread membrane.

  In the compressed air filter device according to the present invention, the air introduction hole has a rectangular opening shape, and the inclined surface is formed on a hole inner surface portion corresponding to at least one side of the rectangle. It is desirable that is formed.

  In the present invention, it is preferable that the air introduction holes are arranged in the circumferential direction of the cylindrical wall and are provided in a plurality of stages in the height direction of the cylindrical wall. .

  Furthermore, according to one of the advantageous aspects of the compressed air filter device according to the present invention, the compressed air sent from the second filter means is supplied to the ceiling of the cylindrical member. An air introduction auxiliary hole leading to the hollow fiber membrane of the membrane member is further provided and configured.

  In addition, according to one of the desirable embodiments of the compressed air filter device according to the present invention, a plurality of the air introduction holes are arranged in the circumferential direction of the cylindrical wall in a rectangular opening shape and the height of the cylindrical wall is increased. In addition to being provided in a plurality of steps in the vertical direction, hole inner surface portions corresponding to two sides facing each other in the circumferential direction of the cylinder wall of the air introduction hole are each configured by the inclined surface.

  Further, according to another preferred embodiment of the compressed air filter device according to the present invention, the plurality of air introduction holes arranged in the circumferential direction of the cylindrical wall have the axial center of the cylindrical member. The inclined surface formed symmetrically with respect to one radial dividing surface and formed on the hole inner surface portion corresponding to the two opposite sides of the air introduction hole is formed on the one dividing surface. On the other hand, it is configured to be positioned symmetrically.

  Thus, in the compressed air filter device according to the present invention, in addition to the first filter means and the second filter means, the third filter means includes the cylindrical member, the membrane member, and the air collecting part. The flow of compressed air sent from the second filter means is introduced into the cylindrical member through a number of air introduction holes provided in the cylindrical wall of the cylindrical member, and used as a membrane member. By being configured to be able to pass through the hollow fiber membrane of the book, it is possible to effectively increase the air flow rate, such as vapor, liquid or solid fine particles existing in compressed air, as well as microorganisms and bacteria Inclusions can be advantageously removed.

  Moreover, in the compressed air filter device according to the present invention, a large number of air introduction holes provided in the cylindrical wall of the cylindrical member constituting the third filter means have at least a part of the inner surface of the cylindrical wall. Since the hole structure has an inclined surface inclined inward from the outer surface side to the inner surface side, the opening of the air introduction hole is narrowed from the outer surface side to the inner surface side of the cylinder wall. It is becoming narrower. That is, since the connecting portion in which the air introduction hole of the cylindrical wall is not formed is widened from the outer surface side toward the inner surface side, the strength of the cylindrical member can be advantageously ensured. The risk of deformation and damage of the third filter means can be advantageously avoided or suppressed.

It is sectional explanatory drawing which shows an example of the filter apparatus for compressed air according to this invention. It is an AA cross-section enlarged explanatory view in Drawing 1, and only a portion of a support member is shown. It is front explanatory drawing which shows the cylindrical member which comprises the 3rd filter means used for the filter apparatus for compressed air shown by FIG. A sectional view of the tubular member shown in FIG. 3, (a) a C ₁ -C ₁ enlarged sectional illustration in FIG. 3, (b), the C ₂ -C ₂ section of FIG. 3 FIG. It is BB sectional explanatory drawing in FIG. 1, Comprising: Only the part of the 3rd filter means is shown. FIG. 6 is an enlarged explanatory view of a D part in FIG. 5. It is EE sectional explanatory drawing in FIG. 6, Comprising: The flow of the compressed air in an air collection part is shown. It is front explanatory drawing which shows another example of the cylindrical member which comprises the 3rd filter means used for the filter apparatus for compressed air according to this invention. It is FF cross-section enlarged explanatory drawing in FIG.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows an example of a compressed air filter device according to the present invention in the form of a longitudinal sectional view. The compressed air filter device 10 includes a lower housing 18 in which the first filter means 12, the second filter means 14 and the drain device 16 are accommodated, and an upper portion in which the third filter means 20 is accommodated. The housing 22 and a partition member 28 having a compressed air introduction passage 24 and a delivery passage 26 disposed so as to be positioned between the lower housing 18 and the upper housing 22 are configured.

  In the compressed air filter device 10, the configuration other than the third filter means 20 disposed in the upper housing 22 and its fixing structure is the same as the conventional one. A structure similar to that shown in Utility Model Registration No. 2543671 cited as Patent Document 1 is adopted.

  Therein, the partition member 28 has a substantially thick disk shape, and has a compressed air introduction passage 24 and a delivery passage 26 that open at radially symmetric positions on the side surfaces thereof and extend radially in the thick portion. In addition to being provided independently, a plurality of intermediate passages 30 penetrating vertically in the thickness direction are provided. A lower opening 32 communicating with the introduction passage 24 is provided at the center of the lower surface of the partition member 28, and an external compressed air supply passage is connected to the introduction passage 24 opening on the side surface thereof. It is like that. Further, a cylindrical fitting convex portion 36 is integrally provided on the upper surface of the partition member 28, and a delivery passage 26 communicating with the upper opening 34 that opens to the top surface of the fitting convex portion 36 is provided. These are arranged in an L-shape as a whole, open to the side surface of the partition member 28, and connected to an external air passage.

  Further, a known first filter means 12 is disposed at the lower part of the partition member 28 so as to be connected to the lower opening 32, and further concentrically outside the first filter means 12. A known second filter means 14 is arranged so as to be located at the position. And on the outside of the second filter means 14, the bottomed cylindrical lower housing 18 is assembled integrally and airtightly via the O-ring 38 to the lower surface of the partition member 28, A sealed space is formed in the lower housing 18. As a result, the first filter means 12 is disposed in the upper central portion of the sealed space, and the second filter means 14 is disposed so as to be located outside the first filter means 12. On the other hand, the well-known drain device 16 has a structure that is arranged at the lower part of the sealed space.

  And here, the first filter means 12 in the compressed air filter device 10 is made of resin air swirl in a resin cylinder 40 as known in Japanese Patent Laid-Open No. 5-317630. The deflector is accommodated and filled as the first filling 42. Further, in the second filter means 14, a resin-made inner cylinder 44 having an inner diameter larger than the outer diameter of the cylindrical body 40 by a predetermined dimension larger than the inner cylinder 44 and substantially the same. A resin-made outer cylinder 46 having a length has an annular cylinder having a double cylinder structure formed concentrically and integrally, and in the space between the outer cylinder 46 and the inner cylinder 44 In addition, the second filling 48 as a filter medium (filter material) is filled. As the second filling 48, as is well known, a structure in which yarns made of cotton fibers or the like are knitted or woven is wound and used.

  On the other hand, the upper housing 22 having a bottomed cylindrical shape is screwed to the upper portion of the partition member 28 via an O-ring 50 at the opening thereof, so that the airtightly attached to the inside. A space is formed. The upper housing 22 is provided with a cylindrical support member 52 concentrically and integrally projecting downward from the bottom inner surface of the upper housing 22. The support member 52 is formed such that the tip portion thereof has a stepped shape having a step portion 52a and a thin tip portion 52b, and at a predetermined interval as is apparent from FIG. A plurality of (here, three at 120 ° intervals) notches 54 are formed.

  In the sealed space formed inside the upper housing 22, the substantially cylindrical third filter means 20 is substantially concentric with the first filter means 12 and the second filter means 14 described above. It is arrange | positioned so that it may be located in.

  The third filter unit 20 includes a cylindrical member 56, a membrane member 58, and an air collecting part 60. Specifically, the cylindrical member 56 is composed of a lower member 62 and an upper member 64 made of resin, respectively, and a lower end opening portion of the upper member 64 and an upper end opening portion of the lower member 62 are provided. Are hermetically fixed to form a cylindrical member 56 having a circular inner space. Therefore, the lower member 62 has a bottomed cylindrical shape, and a circular air outlet 66 is provided at the center of the lower bottom portion 62a. From the lower bottom portion 62a of the lower member 62, a fitting tube portion 68 having a diameter smaller than that of the lower member 62 and an outer peripheral surface of a stepped cylindrical shape is provided concentrically and integrally. The inner circumferential surface has substantially the same diameter as the air delivery port 66. Further, an annular O-ring insertion groove 70 is provided in an axially intermediate portion of the inner peripheral surface of the fitting cylinder portion 68, and an O-ring 72 is inserted.

  Further, the upper member 64 has a bottomed cylindrical shape, and a concave portion 74 is formed in a central portion of the upper bottom portion (ceiling portion) 64a. Further, a circular hole shape is formed in the central portion of the concave portion 74. The air introduction auxiliary hole 76 is provided. In the cylindrical wall 64b of the upper member 64, a large number of air introduction holes 78 are arranged in the circumferential direction and in a plurality of stages (here, five stages) in the height direction of the cylindrical wall 64b. It is provided so as to penetrate through the cylindrical wall 64b. Here, in the present embodiment, the air introduction hole 78 is configured in a characteristic hole structure as will be described in detail below.

  That is, as shown in FIGS. 3 and 4, the air introduction hole 78 provided in the cylindrical wall 64 b of the cylindrical member 56 (upper member 64) has a rectangular opening shape and extends in the circumferential direction of the cylindrical wall 64 b. The hole inner surfaces located at the two sides of the air introduction hole 78 facing the circumferential direction of the cylindrical member 56 are directed from the outer surface side to the inner surface side of the cylindrical wall 64b. Thus, the inclined surface 80 is inclined inward of the hole. In other words, the connecting portion of the cylindrical wall 64b where the air introduction hole 78 is not formed is configured such that the circumferential length increases from the outer surface side to the inner surface side of the cylindrical wall 64b. The compressed air is introduced into the cylindrical member 56 through the air introduction hole 78 squeezed radially inward as described above.

  Further, as shown in FIG. 1, the membrane member 58 includes a large number of hollow fiber membranes 82, and each is housed inside the tubular member 56 (upper member 64) in a U-shape. That is, each of the hollow fiber membranes 82 is folded back into a substantially U shape with a predetermined length, and the folded-back portion 86 has an inner peripheral surface of the tubular wall 64b of the tubular member 56 (upper member 64), It is arranged so as to be positioned between the outer peripheral surface of the recess 74. In this embodiment, the hollow fiber membrane 82 is a thread-like cylindrical body made of polyvinylidene fluoride resin (PVDF) coated with polyvinyl alcohol (PVA) and having a hollow portion 84 at the center. Then, when compressed air passes from the outside to the inside (hollow portion 84) of the hollow fiber membrane 82 having such a configuration, vapor or liquid particles, solid particles, microorganisms, bacteria, etc. remaining in the compressed air The inclusions are adhered and collected, and are removed or disappeared from the compressed air.

  And the air collection part 60 is formed in the internal space by the side of the air delivery port 66 of the cylindrical member 56. As shown in FIG. The air collecting part 60 has a form in which the hollow fiber membrane 82 penetrates the resin part 88, and specifically has a form as shown in FIGS. That is, the hollow portion 84 at the end of the hollow fiber membrane 82 is opened at the end surface of the air collection portion 60 on the air outlet 66 side, and the hollow fiber membrane 82 is indicated by a two-dot chain line arrow in FIG. Compressed air that has passed through is guided to the air outlet 66. In addition, such an air collection part 60 is, for example, fixing the end part of the multiple hollow fiber membranes 82 on the side opposite to the folded part 86 with urethane resin to form the resin part 88, and then the resin part 88 is fixed to the inner peripheral surface of the lower end portion of the upper member 64 by a method such as adhesion. Moreover, as resin for forming the resin part 88, epoxy resin etc. can be used besides the urethane resin mentioned above.

  As shown in FIG. 1, the third filter means 20 having such a configuration is held in a fixed position with its upper portion pressed and supported by a support member 52 extending from the upper housing 22. -ing That is, the tip 52b of the support member 52 is inserted into the recess 74 provided in the upper part (ceiling part 64a) of the third filter means 20 (tubular member 56), and the recess 74 is provided by the step 52a. That is, the peripheral edge portion of this is pressed and held. Here, the sealed space in the upper housing 22 and the internal space of the cylindrical member 56 are not only a large number of air introduction holes 78 provided in the cylindrical wall, but also the notches 54 and the air introduction assistance provided in the support member 52. The hole 76 is also communicated. Further, at the lower part of the third filter means 20, the fitting cylinder part 68 provided at the lower part (lower bottom part 62 a) is fitted with a fitting projection provided on the upper surface of the partition member 28 via the O-ring 72. The outer peripheral portion of the portion 36 is liquid-tightly attached.

  Thus, the space outside the third filter means 20 in the sealed space in the upper housing 22 is communicated with the sealed space in the lower housing 18 through the intermediate passage 30 of the partition member 28 and the third filter means. The inner space 20 is communicated with the upper opening 34 of the partition member 28 through the air outlet 66 below the air collecting part 60.

  By the way, in the compressed air filter device 10 having such a structure, the compressed air is circulated through a path as shown by a white arrow in FIG. 1 and purified. is there. That is, first, the compressed air is guided from the introduction passage 24 of the partition member 28 in the filter device 10 through the lower opening 32 into the first filter means 12 having a large flow cross-sectional area. At that time, the liquid fine particles of water and oil contained in the compressed air are condensed into droplets by the adiabatic expansion action and by the centrifugal separation action by being swirled in the presence of the first filling 42. It can be coalesced and effectively separated from the compressed air along with the solid particulates. Then, the separated liquid fine particles and the like are guided to the lower part in the lower housing 18 by circulating compressed air and discharged to the outside by the drain device 16.

  Next, the compressed air from which the liquid fine particles and the solid fine particles have been separated in this way is guided into the second filter means 14, where the liquid fine particles remaining in the compressed air are adsorbed by the second filling 48. Or the solid particles that are vaporized by the action of the swirling phenomenon of the air flow caused when passing through the second filling 48 or the like are collected when passing through the second filling 48. It will be.

  Thereafter, the compressed air is further introduced into the upper housing 22 through the intermediate passage 30 of the partition member 28, and in the third filter means 20, the hollow fiber membrane 82, which is the membrane member 58, is moved from the outside to the inside (hollow). By passing toward the portion 84), liquid fine particles and solid fine particles, and further microorganisms and bacteria that cannot be removed by the second filter means 14 and still remain in the compressed air are removed by the third filter means. 20 is surely captured and separated. Thus, extremely clean purified compressed air free from liquid or solid particulates such as moisture and oil, and microorganisms and bacteria is passed through the upper opening of the partition member 28 from the air outlet 66 of the third filter means 20. It can be sent to the outside through the section 34 and the delivery passage 26.

  Therefore, in the compressed air filter device 10, a plurality of air introduction holes 78 are provided in the cylindrical member 56 in order to introduce the compressed air into the third filter means 20. In order to introduce the air efficiently, it is necessary to increase the opening area (venting area). For this reason, when the air introduction hole 78 is simply enlarged or a large number of air introduction holes 78 are provided to increase the ventilation area, the opening area of the tubular wall 64b of the tubular member 56 is increased. As the strength of the cylindrical member 56 decreases, there are problems such as damage when manufacturing the third filter means 20 and damage during mounting or use of the third filter means 20. There is a risk of being triggered. In particular, in the compressed air filter device 10, when the upper housing 22 is screwed into the partition member 28 due to a dimensional error of each member, the third member is moved from the support member 52 of the upper housing 22 to the third member. When a large pressure is applied to the filter means 20, there is a possibility that the tubular member 56 is damaged.

  However, in the present embodiment, the air introduction holes 78 provided in the cylindrical wall 64b of the cylindrical member 56 (upper member 64) are such that the inner surfaces of the holes positioned on two sides facing each other in the circumferential direction are the outer surfaces of the cylindrical wall 64b. In the hole structure, which is an inclined surface 80 inclined inward from the side toward the inner surface side, air is introduced from the outer surface side toward the inner surface side in the cylindrical wall 64b of the cylindrical member 56. A cross section is provided in which the connecting portion in which the hole 78 is not formed is wide. For this reason, the strength of the cylindrical member 56 can be advantageously ensured while taking a large opening area of the air introduction hole 78. Therefore, there is a possibility that the cylindrical member 56 may be deformed or damaged when a large stress or load or impact is applied when the third filter means 20 is manufactured or when the third filter means 20 is attached or handled. It can be advantageously avoided or suppressed.

  Further, when the compressed air is purified by the third filter means 20, it is necessary to pass the compressed air through the air introduction hole 78 of the cylindrical member 56, and therefore pressure loss (pressure loss) occurs. There is. In particular, conventionally, a round hole-shaped through hole provided as an air introduction hole in a cylindrical member has an inner surface that is substantially parallel to the radial direction of the cylindrical member. In the edge portion (peripheral hole peripheral portion) on the outer surface side of the cylinder wall, a turbulence or a vortex of the flow of compressed air may occur, which contributes to an increase in pressure loss. However, in the present embodiment, since the compressed air is guided along the inclined surface 80 and guided into the cylindrical member 56, the edge portion of the air introduction hole 78 on the outer surface side of the cylindrical wall 64b. In this case, the turbulence of the flow of compressed air and the generation of vortices are prevented as much as possible, and the advantage that the increase in pressure loss can be advantageously suppressed is exhibited.

  Further, in the compressed air filter device 10, the air introduction hole 78 includes an inclined surface 80 in which at least a part of the inner surface of the hole is inclined inward from the outer surface side of the cylindrical wall 64 b toward the inner surface side. The flow of compressed air introduced into the cylindrical member 56 through such an air introduction hole 78 is adjusted by the so-called nozzle effect, so that the flow rate of the compressed air is reduced. The flow rate can be increased and the flow rate can be increased, so that the flow rate of compressed air that can be processed can be increased.

  In addition, since the deterioration of the membrane member 58 (hollow fiber membrane 82) is not partially biased by realizing a uniform flow of compressed air, the life of the membrane member 58 (required performance may be satisfied). It is also possible to advantageously extend the period until it is impossible.

  In this embodiment, the air introduction holes 78 are arranged in the circumferential direction of the cylindrical wall 64b (in the present embodiment, twelve in this embodiment), and a plurality of stages (in this case, in the height direction of the cylindrical wall 64b In the embodiment, it is provided in five stages). However, by providing the air introduction hole 78 over the entire surface of the cylindrical wall 64b in this way, it is possible to take an opening (ventilation) area advantageously large. It will be possible. In the present embodiment, since the air introduction holes 78 have a rectangular opening shape, the air introduction holes 78 are efficiently and regularly arranged in the circumferential direction and the height direction of the cylindrical wall 64b. Is possible.

  In this embodiment, the cylindrical member 56 (upper member 64) is molded by a normal injection molding operation, and at the same time, an air introduction hole 78 is formed. As shown in the figure, the hole inner surface portions corresponding to the two sides facing each other in the circumferential direction of the cylindrical wall 64b of the air introduction hole 78 are constituted by the inclined surfaces 80, 80. That is, each of the inclined surfaces 80 is a surface substantially parallel to a surface in two directions (surfaces indicated by two-dot chain lines: P and Q in FIG. 4) passing through the center and intersecting substantially vertically. Thus, in the molding die, the number of slide cores for forming the air introduction holes 78 can be reduced as much as possible, and the occurrence of undercuts can be advantageously avoided. is there. And thereby, manufacture (molding operation) of the cylindrical member 56 can be made easy, and the manufacturing cost can be advantageously reduced. Thus, the plurality of air introduction holes 78 are symmetric with respect to one radial dividing surface (a surface indicated by a two-dot chain line: P or Q in FIG. 4) where the axial center of the cylindrical member 56 is located. Therefore, the inclined surface 80 is positioned symmetrically with respect to such one split surface, and thus the above-described manufacturing advantages are advantageously exhibited.

  Furthermore, in the present embodiment, the concave portion 74 is formed in the ceiling portion 64 a of the cylindrical member 56 (upper member 64), and the air introduction auxiliary hole 76 is formed in the central portion of the concave portion 74. In addition, the ventilation area of the compressed air can be further increased while advantageously securing the strength of the cylindrical member 56.

  The exemplary embodiments of the present invention have been described in detail above, but these are merely examples, and the present invention is not limited in any way by specific descriptions according to such embodiments. It should be understood that this is not to be interpreted.

  For example, at least a part of the hole inner surface of the air introduction hole 78 may be an inclined surface 80 that is inclined inward from the outer surface side of the cylindrical wall 64b toward the inner surface side. As shown in FIG. 9, there is no problem even if the entire inner surface of the air introduction hole 78 is the inclined surface 80. In this case, while the strength of the cylindrical member 56 is advantageously secured, the opening area can be further increased, and the rectifying action of the compressed air in the height direction of the cylindrical member 56 is further advantageously exhibited. The effect of reducing the pressure loss associated therewith can be exhibited more advantageously.

  In addition, the method of forming the inclined surface 80 is not limited to the above-described embodiment, and for example, the inclined surface 80 may be formed by cutting the cylindrical wall 64b of the cylindrical member 56 with a drill or the like. It can be set as appropriate according to the required performance such as the opening area and the number of the air introduction holes 78 and the strength of the cylindrical member 56.

  Furthermore, the opening shape of the air introduction hole 78 is not limited to a rectangular shape, and may be, for example, a circular shape or a polygonal shape. Further, the number of the air introduction holes 78 arranged in the circumferential direction and the height direction is not limited to the number of the embodiments, and is appropriately set according to the required performance such as the strength of the cylindrical member 56 and the opening (ventilation) area. I can do it.

  In addition, in the illustrated embodiment, the first filter means 12 is configured such that a resin air swivel deflector is housed and filled as a first filling 42 in a resin cylinder 40. However, instead of this, as is well known, it is also possible to adopt a configuration in which a cylindrical wound body made of metal fibers such as stainless steel fibers is filled in the cylinder as the first filling. Further, as the drain device 16, any of various known drain devices can be adopted.

  In addition, as materials constituting the members constituting the compressed air filter device 10, for example, the lower housing 18, the upper housing 22, the cylinder 40, the inner cylinder 44, the outer cylinder 46, and the cylindrical member 56, It is not particularly limited, and can be selected as appropriate according to required characteristics. Among them, in particular, a transparent material, for example, polycarbonate (PC) resin, can be visually confirmed in the compressed air filter device 10. For reasons, it can be preferably adopted.

  Further, the material of the hollow fiber membrane 82 used in the present invention is not particularly limited to the above, and a known material can be appropriately selected according to required characteristics such as a shape and a hole diameter. For example, organic polymer materials include polyolefin resins, polysulfone resins, polyethersulfone resins, ethylene-vinyl alcohol copolymer resins, polyacrylonitrile resins, cellulose acetate resins, polyvinylidene fluoride resins, poly Examples include perfluoroethylene resins, polymethacrylate resins, polyester resins, polyamide resins, and other components copolymerized, blended with other materials, and hydrophilized. It may be a thing. Moreover, the manufacturing method of the hollow fiber membrane 82 is not particularly limited, and a method appropriately selected from known methods can be employed according to the characteristics of the material and the desired shape and performance of the separation membrane.

  In addition, although not listed one by one, the present invention can be carried out in an embodiment to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Filter apparatus for compressed air 12 1st filter means 14 2nd filter means 18 Lower housing 20 3rd filter means 22 Upper housing 28 Partition member 32 Lower opening part 34 Upper opening part 36 Fitting convex part 52 Support member 52a Stepped portion 52b Tip portion 54 Notch 56 Cylindrical member 58 Membrane member 60 Air collecting portion 62 Lower side member 62a Lower bottom portion 64 Upper member 64a Ceiling portion 64b Cylindrical wall 66 Air outlet / outlet 68 Fitting cylindrical portion 74 Recessed portion 76 Air introduction assist Hole 78 Air introduction hole 80 Inclined surface 82 Hollow fiber membrane

Claims (6)

A first filter means having a first filling in the cylinder and a second filter means having a second filling in the cylinder are disposed in a capture chamber having a predetermined volume, and compressed air is introduced into the cylinder. The inclusion through the passage through the first filter means into the trapping chamber allows the inclusion of vapors, liquid or solid particulates, etc. present in the compressed air to be separated. By introducing the treated compressed air from the capture chamber to the second filter means, inclusions remaining in the compressed air are captured by the second filter means, and the Providing a third filter means separate from the second filter means on the flow path of the compressed air sent out from the second filter means, and allowing the compressed air to flow through the third filter means. The compression In addition the filter device for compressed air to allowed to capture still inclusions remaining in the air,
The third filter means is provided through the cylinder wall with a large number of air introduction holes, and a cylindrical member having an air outlet at the bottom, and a plurality of hollows accommodated in the cylindrical member. Compressed air that is formed in a membrane member made of a yarn membrane and an internal space on the air delivery port side of the tubular member, in which a hollow portion of the hollow fiber membrane in the membrane member is opened, and has passed through the hollow fiber membrane And a gas collecting part that leads to the air delivery port.
The air introduction hole provided in the cylindrical wall of the cylindrical member has a hole structure in which at least a part of the inner surface of the hole is an inclined surface inclined inward from the outer surface side to the inner surface side of the cylindrical wall. Then, the flow of compressed air sent from the second filter means is introduced into the cylindrical member through an air introduction hole provided in the cylindrical wall of the cylindrical member, and the hollow fiber membrane of the membrane member A filter device for compressed air, wherein the filter device is configured to allow air to pass therethrough.   The compressed air filter device according to claim 1, wherein the air introduction hole has a rectangular opening shape, and the inclined surface is formed in a hole inner surface portion corresponding to at least one side of the rectangle.   The compressed air according to claim 1 or 2, wherein the air introduction holes are arranged in a circumferential direction of the cylindrical wall and are provided in a plurality of stages in a height direction of the cylindrical wall. Filter device.   The air introduction auxiliary hole which guides the compressed air sent from said 2nd filter means to the hollow fiber membrane of said membrane member in said cylindrical member is further provided in the ceiling part of said cylindrical member. The filter device for compressed air according to any one of claims 1 to 3.   In the rectangular opening shape, a plurality of the air introduction holes are arranged in the circumferential direction of the cylindrical wall and provided in a plurality of stages in the height direction of the cylindrical wall, and the cylindrical direction of the air introduction hole is 5. The compressed air filter device according to claim 1, wherein hole inner surface portions corresponding to two opposing sides are configured by the inclined surfaces, respectively. A plurality of air introduction holes arranged in the circumferential direction of the cylindrical wall are provided symmetrically with respect to one radial dividing surface on which the axial center of the cylindrical member is located, and the air introduction holes The compressed air filter device according to claim 5, wherein the inclined surface formed in the hole inner surface portion corresponding to the two opposing sides is positioned symmetrically with respect to the one divided surface.

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