JP2014091065A - Filter device and exchange method of filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter device capable of preventing entry of insects surely without increasing an operator's load, and to provide an exchange method of the filter device.SOLUTION: A magnet sheet 7 adsorbable on a filter rail 6 is stuck onto the marginal part on the air circulation direction upstream side in the extending state to an insertion/extraction direction of a filter frame 5, and a thickness adjustment sheet 8 having the same thickness as the magnet sheet 7 and having a surface contact with the filter rail 6 is stuck onto the marginal part on the air circulation direction upstream side of the filter frame 5 where the magnet sheet 7 is not stuck.

Description

  The present invention relates to a room for handling products that do not want insects to enter, such as a pharmaceutical factory, a food factory, a building for pharmaceutical inspection, etc. The present invention relates to a filter device installed in an air flow passage that communicates with each other and a method for replacing the filter device.

  In general, in buildings such as pharmaceutical factories, food factories, and pharmaceutical inspection institutions, as with other-purpose factories and general office buildings, the outside air is taken in from outside through the outdoor galleries, and products are carefully taken. In order to maintain hygiene, dust and insects in the outside air are removed using a filter device when the necessary outside air is introduced into a clean air chamber that is a room for handling products that are not susceptible to insect invasion. In the case of such outside air intake, if the outside air contaminated with dust is filtered through a medium-performance filter (collection efficiency: filter with 50 to 90% colorimetric method) that is suddenly fine, it is immediately clogged with dust. Pre-filter (collection efficiency: colorimetric method with a gravimetric method of about 60 to 90%) is necessary because it takes time and effort to frequently replace the expensive filter and raise extra fan static pressure. It is usual to install a coarse filter medium having a performance of about 15 to 40%. Since this pre-filter is rough, it can be arranged in a flat plate shape so that the surface of the filter medium is orthogonal to the air flow direction, and conversely, by making the filter medium area and the air blowing area the same. As a small area filter, it is made cheap and replaceable and is frequently replaced. However, it also has an important role of capturing large dust and insects in the outside air and preventing the outside air from entering the building. Hereinafter, a device in which the filter loaded with the pre-filter in a frame is fixed to a duct, a filter box, or the like through which air is passed is referred to as a filter device.

  As a conventional filter device, for example, when taking in from outside air via a duct and an outside air introduction fan, as shown in FIGS. 5 and 6, in the middle of the air flow passage 1 such as a duct formed of a zinc iron plate or the like, A slit-like filter exchange opening 2 is provided, and a filter exchange door 3 is attached so as to open and close the filter exchange opening 2, and the filter medium 4 is inserted and extracted from the filter exchange opening 2 into the air flow passage 1. A structure in which a filter frame 5 to be supported is provided, a filter rail 6 is provided on the inner peripheral portion of the air flow passage 1 so as to guide the insertion / extraction of the filter frame 5 and hold the filter frame 5. have.

  The filter rail 6 has an inner peripheral portion having a rectangular cross section of the airflow passage 1 excluding the filter replacement opening 2, that is, the upper side, the lower side, and the three sides of the back side as viewed from the filter replacement opening 2. Each of the portions is a groove-shaped member 6a having a U-shaped cross section formed of a zinc iron plate or the like, and the other inner peripheral portion of the air flow passage 1 having a rectangular cross section, that is, the front side as viewed from the filter replacement opening 2 The side member is a plate member 6b such as a galvanized iron plate connected to the flange on the upstream side in the air flow direction of the groove member 6a.

  In the filter device, as shown in FIG. 6, in a state in which the filter frame 5 is inserted and arranged in the air flow passage 1 along the filter rail 6, air is moved by the operation of a fan (not shown). By flowing through the flow passage 1 and passing through the filter medium 4 supported by the filter frame 5, dust and insects in the air are removed, and then introduced into a clean air chamber (not shown). It has become.

  For example, Patent Document 1 shows a general technical level related to the filter device as described above. In Patent Document 1, a filter frame that supports a prefilter filter material is installed outside an air inlet of an air conditioner indoor unit that uses a refrigeration cycle of chlorofluorocarbon refrigerant so as to be externally covered. Attachment to a frame is disclosed.

JP 11-182922 A

  In the conventional filter device, as shown in FIG. 6, the filter frame 5 can be inserted into and pulled out of the air flow passage 1 along the filter rail 6, so that the filter frame 5 is interposed between the filter rail 6 and the filter frame 5. It is inevitable that a gap is generated in this case, and there is a possibility that insects may enter the clean air chamber from this gap.

  In order to prevent such insects from entering, the filter frame 5 is usually brought into close contact with the filter rail 6, that is, the filter rail 6 (the inner surface of the flange located on the upstream side in the air flow direction of the channel member 6a). In order to press the opposite side surfaces of the filter frame 5 onto the filter rail 6, a female screw is screwed to the filter rail 6 (a flange located on the downstream side in the air flow direction of the channel member 6a), and a bolt is screwed into the female screw from the downstream side in the air flow direction. It has been necessary to uniformly press-fit the mechanism in which the bolt ends are brought into contact with the downstream side surface in the air flow direction of the filter frame 5 using mechanisms provided at a plurality of locations of the filter frame 5. Alternatively, in order to press the opposite side surface of the filter frame 5 against the filter rail 6 (the flange inner surface located on the upstream side in the air flow direction of the groove member 6a), the filter rail 6 (the upstream side in the air flow direction of the groove member 6a). A plurality of clamps projecting to the outside of the filter rail 6 with the outer surface serving as a reference surface are provided on the outer periphery of the filter rail 6, and the other surface of the clamp is brought into contact with the downstream side surface of the filter frame 5 in the air flow direction. It has been necessary to uniformly press-fit the mechanism as described above using a mechanism provided at a plurality of locations of the filter frame 5.

  However, as described above, when a mechanism such as a clamp or a screw is provided at a plurality of positions between the filter rail 6 and the filter frame 5, when the filter medium 4 is replaced at the time of maintenance, the work becomes complicated and the burden on the operator is reduced. On the other hand, the tightening method of the screws or the like tends to be uneven, and in this case, there is a possibility that a strain is generated between the filter rail 6 and the filter frame 5 so that a gap remains and insects still enter. It was.

  Incidentally, when the fan is operated, the downstream side in the air flow direction becomes negative pressure, or the upstream side in the air flow direction becomes positive pressure, the filter frame 5 moves to the left in FIG. 6, and the air flow direction of the filter frame 5 The downstream edge contacts the filter rail 6 (a flange located downstream in the air flow direction of the groove-shaped member 6a) so as to be sucked or pressed, but the filter frame 5 is upstream in the air flow direction. The gap between the side edge and the filter rail 6 (the flange located on the upstream side in the air flow direction of the groove-shaped member 6a) rather widens, so that insects enter the gap, and dust and dirt are clogged. There was a bug. If insects enter the gaps, the gaps where the dynamic pressure of the circulating air can be avoided will keep the insects comfortable and stay in the room. For example, in the case of a room where the air blowing is stopped every day, the fan operates. When the suction of the filter frame 5 is released due to the stop, a gap with the flange is generated, and the insects are immediately scattered downstream. In addition, when dust or dust is clogged, the filter frame 5 may be in a state of being bitten by the filter rail 6, and there is a possibility that the filter frame 5 may be pulled out.

  The present invention has been made in view of the above-described conventional problems, and intends to provide a filter device and a method for replacing the filter device that can reliably prevent insects from entering without increasing the burden on the operator. Is.

The present invention relates to a filter device that filters air that passes through an air flow passage by the operation of a fan.
A filter replacement opening provided in the middle of the air flow path;
A filter replacement door attached to the air flow passage to open and close the filter replacement opening;
Supports a filter medium disposed so as to be freely inserted into and withdrawn from the filter exchange opening into the air flow passage and having a smaller area than the cross-sectional area of the air flow passage and perpendicular to the air flow direction. Filter frame to
A filter rail disposed on the inner periphery of the air flow passage to guide insertion and extraction of the filter frame and hold the filter frame;
A magnet sheet having a non-magnetization thickness with one side being an adhesive surface, which is attached to an edge portion that is upstream in the air flow direction by extending in the insertion / withdrawal direction of the filter frame and can be adsorbed to the filter rail;
A thickness adjusting sheet having the same thickness as the magnet sheet and extending in a direction perpendicular to the insertion / extraction direction of the filter frame and being affixed to an edge on the upstream side in the air circulation direction and in surface contact with the filter rail; The present invention relates to a filter device characterized by comprising:

  In the filter device, the non-magnetized thickness side is formed by applying an adhesive surface to the magnetized surface of the same magnet sheet as the magnet sheet as the thickness adjusting sheet and attaching the adhesive surface of the magnet sheet to the filter frame. It is preferable to provide the thickness adjusting sheet opposed to the filter rail.

  Further, the filter device preferably has a thin plate that is inserted between the filter rail and the filter frame only when the filter frame is inserted / pulled out and can block the magnetic force.

  As a method for replacing the filter device, the thin plate is inserted between the filter rail and the filter frame when a new filter frame is inserted after the filter replacement door is opened or when a filter frame that has been used for a certain period is pulled out. Can be.

  According to the filter device and the method for replacing the filter device of the present invention, it is possible to achieve an excellent effect that insects can be reliably prevented from entering without increasing the burden on the operator.

It is a schematic block diagram which shows the Example of the filter apparatus of this invention. It is sectional drawing which shows the Example of the filter apparatus of this invention. It is sectional drawing which shows the state which inserted the thin plate between the filter rail and the filter frame in the Example of the filter apparatus of this invention. It is the schematic which shows the example which applied the Example of the filter apparatus of this invention to the return air suction inlet. It is a perspective view which shows an example of the conventional filter apparatus. It is sectional drawing which shows an example of the conventional filter apparatus.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3 show an embodiment of the filter device of the present invention. In the figure, the same reference numerals as those in FIGS. 5 and 6 denote the same components, and the basic configuration is shown in FIGS. Although it is the same as that of the prior art shown in FIG. 6, the feature of this embodiment is that it extends in the insertion / extraction direction of the filter frame 5 and becomes upstream in the air flow direction as shown in FIGS. 1 to 3. The magnet sheet 7 that can be adsorbed to the filter rail 6 (the flange located upstream in the air flow direction of the upper and lower channel members 6a) is attached to the edge (the edges corresponding to the upper and lower sides of the rectangle) Magnets are attached to the upstream edge (the edge corresponding to the left and right sides of the rectangle) of the filter frame 5 extending in the direction orthogonal to the insertion / extraction direction of the filter frame to which the magnet sheet 7 is not attached. Filter with the same thickness as sheet 7 (A flange located as viewed from the filter exchange opening 2 air flow direction upstream side of the inner side of the channel members 6a, the plate member 6b) Lumpur 6 lies in pasted thickness adjusting sheet 8 to surface contact with.

  In the case of the present embodiment, the thickness adjustment sheet 8 is formed by applying an adhesive surface to the magnetized surface of the same magnet sheet as the magnet sheet 7 and attaching the adhesive surface of the magnet sheet to the filter frame 5 so that the non-magnetized thickness. The thickness adjustment sheet 8 is configured by making the side face the filter rail 6.

  Further, when a new filter frame 5 is inserted after the filter replacement door 3 is opened, or when the filter frame 5 that has been used for a certain period of time is pulled out, a thin plate 9 made of plastic or the like capable of blocking magnetic force is used as shown in FIG. The filter rail 6 and the filter frame 5 are inserted.

  Next, the operation of the above embodiment will be described.

  When the filter frame 5 is inserted into the air flow passage 1 along the filter rail 6, as shown in FIG. 2, the magnet sheet 7 is moved to the filter rail 6 (the flange located upstream of the upper and lower channel members 6a in the air flow direction). The thickness adjusting sheet 8 is in surface contact with the filter rail 6 (the flange located on the upstream side in the air flow direction of the groove member 6a on the back side when viewed from the filter replacement opening 2 and the plate member 6b). Since the filter frame 5 can be inserted into and pulled out of the air flow passage 1 along the filter rail 6, a gap generated between the filter rail 6 and the filter frame 5 is defined as an air flow direction of the filter rail 6. It is possible to eliminate the upstream side, and it is possible to prevent insects from entering the clean air chamber such as the production chamber from the gap.

  In addition, unlike the conventional case where a mechanism such as a clamp or a screw is provided at a plurality of positions between the filter rail 6 and the filter frame 5, when the filter medium 4 is replaced during maintenance, the work is not complicated. There is no worry that the load of the screw is increased, the tightening method of the screw or the like is not uneven, and there is no gap between the filter rail 6 and the filter frame 5, so that there is no gap, and insects It is possible to cut off the intruding route.

Here, for example, when the magnet sheet 7 having a thickness of 1.2 [mm], which is used for general purposes, is applied to the magnet sheet 7, it is at least 60 [gf] with an isotropic magnetic force standard. / Cm ² ] or more, for example, two magnet sheets 7 having a width of 3 [cm] and a length of 60 [cm] are vertically arranged on the filter frame 5. When pasted, the resulting adsorption force P is
P = 60 × 3 × 60 × 2
= 21600 [gf]
= 21.6 [kgf]
≈ 21.6 x 9.8 [N]
It becomes. For example, when the magnet sheet 7 having a thickness of 2.0 [mm] is applied to the magnet sheet 7, the unit is at least 70 [gf / cm ² ] with an isotropic magnetic force standard. Since it has an adsorption force per area, when considering the same area as above, the obtained adsorption force P is:
P≈25.2 × 9.8 [N]
Similarly, when the magnet sheet 7 having a thickness of 2.0 [mm] is applied, the magnetic sheet 7 is anisotropic and has an attractive force per unit area of at least 100 [gf / cm ² ] or more. In the case of those having a force, when considered in the same area as above, the obtained adsorption force P is:
P≈36.0 × 9.8 [N]
It becomes.

  Thereby, even if the downstream side in the air flow direction becomes negative pressure due to the operation of the fan or the upstream side in the air flow direction becomes positive pressure, the filter frame 5 is moved to the left in FIG. 2 by the attractive force of the magnet sheet 7. It does not move, but the edge of the filter frame 5 on the downstream side in the air flow direction is in contact with or pressed against the filter rail 6 (the flange located on the downstream side of the groove-shaped member 6a in the air flow direction). In no contact. That is, the gap between the edge of the filter frame 5 on the upstream side in the air flow direction and the filter rail 6 (the flange located on the upstream side of the groove-shaped member 6a in the air flow direction) does not widen. There is no problem of bugs entering or dust or dust clogging.

On the other hand, from the viewpoint of eliminating the gap between the filter rail 6 and the filter frame 5, the same magnet sheet as the magnet sheet 7 is used as the thickness adjusting sheet 8, and the magnetized surface of the magnet sheet is not provided with an adhesive surface. It is preferable that the thickness adjusting sheet 8 is configured by adhering to the filter frame 5 with an adhesive side single side having a non-magnetization thickness provided from the beginning, that is, adhering the magnet sheet to the filter frame 5 without turning over. However, if the thickness adjusting sheet 8 is configured by using the same magnet sheet as the magnet sheet 7 as the thickness adjusting sheet 8 and attaching the magnet sheet to the filter frame 5 without turning it over, the magnet sheet 7 has a very strong attraction force P. Therefore, a large force is required to insert or pull out the magnet sheet 7 along the filter rail 6 from the filter replacement opening 2 into the air flow passage 1. Will increase the burden. In this embodiment, the thickness adjusting sheet 8 is provided with an adhesive surface on the magnetized surface of the same magnet sheet as the magnet sheet 7, and the adhesive surface of the magnet sheet is attached to the filter frame 5. Since the thickness adjusting sheet 8 is configured to face the filter rail 6, the gap between the filter rail 6 and the filter frame 5 is surely eliminated and the filter replacement opening 2 enters the air flow passage 1. The force required for the work of inserting or withdrawing the magnet sheet 7 along the filter rail 6 can be reduced, and the burden on the operator can be reduced. The thickness adjusting sheet 8 does not necessarily need to use the same magnet sheet as the magnet sheet 7, but if the magnet sheet is turned upside down, it necessarily has the same thickness as the magnet sheet 7 and the filter rail 6. On the other hand, it is possible to have no suction force P, which is effective.

  Further, when a new filter frame 5 is inserted after the filter replacement door 3 is opened, or when the filter frame 5 used for a certain period of time is pulled out, as shown in FIG. When inserted between the filter rail 6 and the filter frame 5, the thin plate 9 opens a distance between the magnetized surface of the magnet sheet 7 and the inner surface of the filter rail 6, which is a steel plate to be excited, and the magnetic flux density is reduced. Therefore, the attracting force P of the magnet sheet 7 is weakened, and the insertion / extraction operation of the magnet sheet 7 along the filter rail 6 from the filter replacement opening 2 into the air flow passage 1 can be performed more smoothly. The thin plate 9 has a certain degree of shape retaining property such as hard resin and is inserted in a state where no air is passed. Therefore, the filter frame is used for reliable separation between the magnetized surface of the magnet sheet 7 and the exciting surface of the filter rail 6. 5 and the same area are preferable.

  In this way, insects can be reliably prevented from entering without increasing the burden on the operator.

  FIG. 4 shows an example in which the embodiment of the filter device of the present invention is applied to the return air suction port as the air flow passage 1, and in the figure, the parts denoted by the same reference numerals as in FIGS. It represents the same thing.

  As shown in FIG. 4, the return air inlet as the air flow passage 1 is provided in a wall 10 that partitions a machine room in which an air conditioner is installed and a production room (clean air chamber), and is installed in the machine room. The supply air cooled at a low temperature and supplied to the production room (clean air room) by a duct from the air-conditioning unit is supplied to the return air intake port as return air heated at a low temperature by the indoor heat load. It is returned to the air conditioner that is in airtight communication and circulated. In this way, the outside air is not used in a single pass, but is circulated from the supply air as return air, so that the enthalpy difference from the supply air is often smaller than the outside air, and the stable use of the return air heat is effective. ing.

  When a structure similar to that shown in FIGS. 1 to 3 is adopted for the return air suction port as the air flow passage 1, for example, in the case of a pharmaceutical manufacturing factory, the powder generated in the production room is combined with the return air. It is possible to prevent the air from flowing into the air conditioner.

  The filter device of the present invention and the method for replacing the filter device are not limited to the above-described embodiments, but can be applied to a filter device of a pressure ventilation fan attached to a wall. Of course, various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Air flow path 2 Filter exchange opening 3 Filter exchange door 4 Filter material 5 Filter frame 6 Filter rail 7 Magnet sheet 8 Thickness adjustment sheet 9 Thin plate

Claims (4)

In the filter device that filters the air flowing through the air flow passage by the operation of the fan,
A filter replacement opening provided in the middle of the air flow path;
A filter replacement door attached to the air flow passage to open and close the filter replacement opening;
Supports a filter medium disposed so as to be freely inserted into and withdrawn from the filter exchange opening into the air flow passage and having a smaller area than the cross-sectional area of the air flow passage and perpendicular to the air flow direction. Filter frame to
A filter rail disposed on the inner periphery of the air flow passage to guide insertion and extraction of the filter frame and hold the filter frame;
A magnet sheet having a non-magnetization thickness with one side being an adhesive surface, which is attached to an edge portion that is upstream in the air flow direction by extending in the insertion / withdrawal direction of the filter frame and can be adsorbed to the filter rail;
A thickness adjusting sheet having the same thickness as the magnet sheet and extending in a direction perpendicular to the insertion / extraction direction of the filter frame and being affixed to an edge on the upstream side in the air circulation direction and in surface contact with the filter rail; A filter device comprising:   By applying an adhesive surface to the magnetized surface of the same magnet sheet as the magnet sheet as the thickness adjusting sheet and attaching the adhesive surface of the magnet sheet to the filter frame, the non-magnetized thickness side is made to face the filter rail. The filter device according to claim 1, comprising the thickness adjusting sheet.   The filter device according to claim 2, further comprising a thin plate that is inserted between the filter rail and the filter frame and capable of interrupting the magnetic force only when the filter frame is inserted and pulled out.   The filter according to claim 3, wherein the thin plate is inserted between the filter rail and the filter frame when a new filter frame is inserted after the filter replacement door is opened or when the filter frame used for a certain period of time is pulled out. How to replace the device.

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