JP2018069152A - Filter device for air cleaning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems that clogging and pressure loss caused by clogging are made large since a large amount of moisture is stuck and collected with dust especially by a filter for coarse dust in a high humidity climate condition when introducing outside air and moisture immersed in an air duct gives a bad influence to the air duct, a chamber, the other devices and air purification itself.SOLUTION: In a filter device for separating moisture from air holding and housing a filter medium 11 in a direction blocking the stream of air in a frame-like frame 9, being installed in an air duct 3 blowing introduced outside air to a next process and separating moisture stuck to the filter medium 11 from outside air and collecting,: a water resistant seal bottom 12 for receiving moisture collected by the filter medium 11 at a bottom in the frame 9 corresponding to the lower end side of the filter medium 11; and the seal bottom 12 is inclined to a horizontal surface.SELECTED DRAWING: Figure 2

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an air cleaning filter device that separates and removes moisture in the air when indoor air is controlled by introducing outside air.

Conventionally, in the environmental control of clean rooms used for industrial use, medical use, physics and chemistry tests, etc., an air purification filter is installed in the air passage for introducing outside air. In many cases, dust filters are installed in a plurality of stages (see Patent Document 1).
Of the above filters, the coarse dust filter is particularly required to have high air permeability in order to suppress pressure loss. On the other hand, in the treatment of outside air containing moisture and salt, water and salt are collected, so dust separation is important. For this reason, a non-woven fabric made of a resin having excellent air permeability, a mesh material or the like with a PTFE porous film attached thereto is known (see Patent Document 2).

JP2015-62881A JP 2006-175313 A

However, when introducing outside air, especially in climatically high humidity conditions, a large amount of water is collected and collected together with dust, especially in the coarse dust filter. Moisture leached into the air has a problem of adversely affecting the airways, chambers and other equipment and the air purification itself.
Furthermore, in the weather under tropical cyclones and in the vicinity of the coast, the outside air contains a large amount of salt in addition to dust and moisture, so the degree of the above-mentioned adverse effect is increased, and filter clogging and pressure loss are further increased due to deliquescence phenomena. There are drawbacks.

  In the filter device of the present invention for solving the above-mentioned problem, first, the filter medium 11 is held in the frame-shaped frame 9 while being held in a direction to block the air flow, and the introduced outside air is blown to the next process. An air cleaning filter device that is installed in the air passage 3 and separates and collects moisture adhering to the filter medium 11 from outside air, and is attached to the filter medium 11 at the bottom of the frame 9 corresponding to the lower end side of the filter medium 11. A seal bottom 12 having water resistance for receiving the collected water is provided, and the seal bottom 12 is inclined with respect to a horizontal plane.

  Secondly, the drain bottom 13 is provided on the inclined lower end side of the seal bottom 12 to receive the water flowing out along the surface of the seal bottom 12 and lead it to the outside of the frame 9 or the air passage 3 to drain the water. Yes.

  Thirdly, the seal bottom 12 is inclined by inclining the frame 9 toward the air supply side of the air passage 3.

  Fourth, the filter medium 11 itself is inclined to the air supply side of the air passage 3.

  Fifth, the filter medium 11 is made of a non-woven fabric made of a water-resistant material, and the supply side surface of the air passage 3 is subjected to water repellent finishing.

  Sixth, the filter medium 11 is formed by bending in a bellows shape in plan view.

  Seventh, the filter medium 11 is provided with a spacer 11a for maintaining a bellows shape, and the spacer 11a is inclined with respect to a horizontal plane.

The apparatus of the present invention configured as described above has the following effects.
(1) Since the seal bottom on the lower end side of the filter medium is inclined in the frame of the filter device, the moisture collected on the filter medium is dripped or flowed down to the seal bottom and guided to the inclined lower end side, It is discharged outside. As a result, moisture does not flow out into the filter device or the air passage, so that damage due to corrosion or rust due to moisture in the air passage or the filter device is prevented, and adverse effects on air purification due to the water are also prevented.

(2) In addition, there is an advantage that dust, salt, etc. are discharged together with water by the flow and discharge of the collected water as described above, and in particular, the surface of the filter medium on the upstream side (supply) side is subjected to water repellent treatment The collected water drops or flows down on the surface of the filter medium before being transported downstream of the filter medium, so that dust and salt can be washed away from the surface of the filter medium. This is particularly effective in combating salt damage.

  In addition, by tilting the frame and the filter medium itself to the air supply side, a downward airflow is generated on the surface of the filter medium that has been water-repellent processed by the wind hitting the filter medium, and it helps to drip or flow out moisture downwards, There is an advantage of producing an effect of enhancing the cleaning effect of the filter medium.

It is a whole lineblock diagram showing an example of an air purification system using a device of the present invention. (A), (B) is the front view and side view of the filter apparatus of this invention. It is III-III sectional drawing of FIG. 2 (A) which shows the bottom part drainage structure of this invention apparatus. (A), (B) is the elements on larger scale and front view which show an example of the filter medium used for the apparatus of this invention. It is the principal part perspective view which showed another Example of the filter apparatus.

  The embodiment of the present invention illustrated below will be described in detail. FIG. 1 is an overall configuration diagram showing an example of an air purification system showing an application example of the apparatus of the present invention. For example, an air purification device 2 that supplies purified air to a purification room 1 that has been purified for the manufacture of electronic components, physicochemicals, medical products, etc. A louver 4 is installed that collects varieties, etc., and collects dust with a coarse particle size in the vertical direction and water such as mist, liquid droplets or water vapor contained in the air so as to be partitioned in the air passage 3 on the discharge side. A filter device 6 for separating air and water (for cleaning air) is installed so as to partition the inside.

  A fine particle filter 7 for collecting finer particles is installed at the end of the air passage 3 according to the degree (necessity) of air purification required for the purification room 1, and in this example, the fine particle filter 7 The purified air is introduced into the purification room 1 and exhausted, and a part of the air is returned from the circulation path 8 to the upstream side of the filter device 6 for separating air and water in the air passage 3. The air purification system itself is not limited to that shown in FIG. 1 because it varies depending on the type of purification room 1 and the required degree of air purification.

  2 to 4 are drawings showing a detailed configuration of the filter (filter material) of the filter device 6 used in the device of the present invention. The filter device 6 has a size of about 610 × 610 × 150 (mm), for example. The main body and the frame are constituted by a rectangular parallelepiped frame 9 made of an aluminum extruded material or the like. In the frame 9, as shown in FIGS. 4A and 4B, a fluororesin HEPA filter (fluororesin composite film) that is bent in a bellows shape in a plan view and has water resistance, acid resistance, and the like. The filter medium 11 to be formed is processed and accommodated in a size substantially matching the internal shape of the frame 9.

  The filter medium 11 is a non-woven sheet material made of a fluororesin composite film that has excellent air permeability and does not have water permeability. At least the air supply side (upstream side) surface is subjected to water-repellent finish and the back surface is embossed. A protrusion (spacer) 11a protruding from the surface to the surface side is formed.

  This spacer 11a protrudes in the cross-section of the inverted V shape in plan view that constitutes the bellows, and holds the inverted V shape (the back side is V shape in plan view) itself as shown in FIGS. 4 (A) and 4 (B). They are in contact with each other in the inverted V-shaped cross section so as to act as spacers and are fixed to each other by hot melt or the like. Further, in order to keep the spacers 11 a in contact with each other and keep the V shape, the height of the protrusion is made smaller as the distance from the center of the inverted V-shaped cross section is closer. The embossing has a function of increasing the air contact surface to increase the purification efficiency, and can be processed so as to protrude also to the back side (discharge side) of the filter medium 11.

The bottom frame 9a of the frame 9 is made of a single metal plate, but its upper surface is processed and inclined at a slight inclination angle θ ₁ (for example, about 3 ° to 5 ° with respect to the horizontal plane) toward the air supply side. The seal bottom 12 is formed and installed with a plastic material such as polyurethane or a metal plate, and the lower end of the filter medium 11 is also inclined corresponding to the inclined surface of the seal bottom 12 accordingly. Since the lower end of the filter medium 11 and the upper surface of the seal bottom 12 need only be dripped or flowed down the upper surface of the seal medium 12 and discharged along an inclination as will be described later, stable fixation It is not necessary to make contact as long as the characteristics can be achieved.

  Further, as shown in FIG. 3, a drainage receiver 13 having a bowl-shaped (channel-shaped) cross section is installed on the inclined lower end side of the seal bottom 12 along the left and right width of the frame 9. Moisture that has flowed along is received by the drain receiver 13 and drained to the outside through a drain hole (not shown). For this reason, it is desirable to attach the drain receiver 13 that is inclined to the left or right with respect to the frame 9 or that is formed to be inclined downward in a funnel shape toward any position between the left and right.

  According to the filter device 6 of the present invention configured as described above, the air introduced into the air passage 3 first collides with or comes into contact with the surface (front surface) on the air supply surface side of the filter medium 11 in the filter device 6. Passes to the back side. At this time, dust in the air adheres to the filter medium 11 and is collected. At the same time, water such as mist, water droplets or water vapor contained in the air simultaneously condenses or adheres to the filter medium 11 and is deposited on the surface of the filter medium 11. However, the collected dust is also caused to flow downward by the moisture. This water flow is reliably performed in a short time by applying a water-repellent treatment to the surface of the filter medium 11 and also has an effect of easily washing away dust.

In the above embodiment, the seal bottom 12 itself is inclined with respect to the frame 9, but as shown in FIG. 2 (B), the inclination angle θ of about 3 ° to 5 ° with the center 0 of the frame 9 toward the upstream side. It is also possible to tilt the seal bottom 12 itself by tilting it forward by ₂ and attaching it to the air passage 3. Further, in this method, since the filter medium 11 itself tilts forward, the air flow that collides with the front face of the filter medium 11 is guided downward, and there is an advantage that the outflow of moisture adhering to the filter medium surface and the washing out effect of the adhering dust are enhanced. The forward tilting of the filter medium 11 can be performed independently of the seal bottom 12.

  Incidentally, the seal bottom 12 may be configured to collect moisture collected by a drain receiver 13 disposed on the rear side of the filter medium 11 (filter device 6) by being inclined rearward.

  The filter medium 11 used in the present invention is not limited to the non-woven fluororesin HEPA filter described above, and glass fiber cloth, carbon fiber cloth, or other mesh materials can be used. In order to more reliably collect the moisture, it is desirable to use a mechanism that blocks the flow of supplied air by the filter medium 11. In addition, the air passage used in the description of the present invention is not limited to an independent tubular air passage, and is formed to allow air to circulate widely, such as a window provided for installing the filter device 6 on a wall or a floor. It refers to a space.

  Further, the filter medium 11 may constitute a filter device 6 that can be used in facilities such as a nuclear power plant by using a flame-retardant sheet-like member. Specifically, the filter medium 11 uses a non-woven fabric composed of two layers of polypropylene (pp) and water-repellent polyester, and is made of a fluorine-based water repellent and an inorganic flame retardant (brom antimony-based). It is formed into a flame retardant sheet-like member by coating with a flame retardant) and a vinyl chloride binder (adhesive).

  Next, another embodiment of the filter device will be described with reference to FIG. FIG. 5 is a perspective view of a principal part showing another embodiment of the spacer in the filter device. In the illustrated example, a bellows member formed by bending a sheet-like member into a bellows shape is used as the spacer 11a used for the filter medium 11 instead of the protruding portion by embossing. The bellows member 11a functions as a spacer that holds the bellows shape of the filter medium 11 by being inserted into the front side of the filter medium 11 with the folds directed in the front-rear direction.

At this time, the bellows member 11a has a predetermined inclination angle θ ₃ (for example, with respect to a horizontal plane) in a direction in which the fold of the bellows member 11a in the front-rear direction descends from the air supply side to the discharge side of the filter medium 11. It is inserted in an inclined state (see FIG. 5).

  With this configuration, water droplets adhering to the surfaces of the filter medium 11 and the bellows member 11a are likely to flow backward along the inclination of the folds of the bellows member 11a so as to be pushed by the air blown to the filter device 6. For this reason, water drops appearing on the surfaces of the filter medium 11 and the bellows member 11 can be efficiently dropped and collected from the rear side of the filter medium 11 to the seal bottom 12 side.

  In addition, you may comprise similarly the said spacer 11a with the U-shaped clip which clamps the fold of the filter medium 11 instead of a bellows member.

DESCRIPTION OF SYMBOLS 1 Purification room 2 Air purification apparatus 3 Air path 4 Louver 6 Filter apparatus 7 Fine particle filter 9 Frame 9a Bottom frame 11 Filter material 11a Protrusion part (spacer)
12 Seal bottom 13 Drainage receptacle θ ₁ , θ ₂ Inclination angle

Claims (7)

  The filter medium (11) is held in a frame-shaped frame (9) while being held in a direction to block air flow, and the filter medium (11) is installed in the air passage (3) for blowing the introduced outside air to the next process. 11) A filter device for air purification that separates and collects moisture adhering to the outside air from the outside air, and is collected by the filter medium (11) at the bottom of the frame (9) corresponding to the lower end side of the filter medium (11). An air purifying filter device provided with a seal bottom (12) having water resistance for receiving moisture, and inclining the seal bottom (12) with respect to a horizontal plane.   A drainage receptacle (13) that receives moisture flowing out along the surface of the seal bottom (12) on the inclined lower end side of the seal bottom (12) and guides it to the outside of the frame (9) or the air passage (3) and drains it. The air cleaning filter device according to claim 1 provided.   The air cleaning filter device according to claim 1 or 2, wherein the seal bottom (12) is inclined by inclining the frame (9) toward the air supply side of the air passage (3).   The air cleaning filter device according to any one of claims 1 to 3, wherein the filter medium (11) is inclined toward the air supply side of the air passage (3).   The air cleaning filter device according to any one of claims 1 to 4, wherein the filter medium (11) is made of a non-woven fabric made of a water-resistant material, and a water repellent finish is applied to a supply side surface of the air passage (3).   6. The air cleaning filter device according to claim 5, wherein the filter medium (11) is formed in a bellows shape when viewed from above.   The filter for air purification according to claim 6, wherein a spacer (11a) for maintaining a bellows shape is provided on the filter medium (11), and the spacer (11a) is inclined with respect to a horizontal plane.

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