JP2011072962A - Filter device and filter exchanging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter device capable of making the full use of all incorporated filters to the every end, in which filtered air is not contaminated again by the contamination of the filter, and a filter exchanging method in the filter device. <P>SOLUTION: The filter device includes a front filter holder 7 in which the filters a to d are held in an air flow passage X through which outside air is introduced from the front side, and a rear filter holder 8 in which the filters e and f are held. A contamination detection sensor 11 is provided between the holders 7, 8. When the contamination of the filter d is detected by the contamination detection sensor, the leading filter a is picked out, the succeeding filters b to f are transferred forward successively, and the new filter g is inserted to the rearmost of the rear filter holder 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a filter device for an air purification device, and also relates to a filter replacement method in the filter device.

  In a conventional air purification apparatus having a structure in which a plurality of dry filters are arranged in an air flow path, for example, as described in Patent Document 1 and Patent Document 2, as a method of replacing a dirty filter, Of the multiple filters that are held side by side along the air flow path, remove the most dirty filter held at the top (most upstream) holding position, discard it, and use it at a holding position in the middle Instead of discarding the filter, it is transferred to the upstream holding position in order and reused, and the filter is moved and a new filter is set at the rearmost (most downstream) holding position. Proposed.

  According to such a filter replacement method, do not discard a filter that still has a filtering capacity, compared to a case where all filters that still have a filtering capacity remaining at the time of filter replacement are replaced with new filters. Since it can be used again, there is an advantage that the number of exchanged filters can be reduced.

Japanese Patent No. 2963311 Registered Utility Model No. 3140157

  In the air purification apparatus having a structure in which a plurality of dry filters are arranged in the air flow path as described above, the filter replacement time is generally determined by staining the filter held on the most downstream side of the air flow path. It is detected by a detection sensor.

  However, when dirt is detected in the most downstream filter, the dirt trapped by the filter has already reached the rear surface, so that air that has been re-contaminated by this dirt is released from the air purification device. There was a risk of being done.

  Therefore, the present invention solves the problems in the prior art as described above, and clean air is not recontaminated with filter dirt, and all the built-in filters are used without waste. It is an object of the present invention to provide a filter device for an air purification device that can be used, and to provide a filter replacement method in the filter device.

  The filter device of the present invention provided for the above purpose arranges a plurality of filters of the same specification in the air flow direction into which external air is introduced from the front end, and holds each filter interchangeably. One or a plurality of filters having the same specifications as the respective filters can be exchanged behind the front filter holding portion and the filter held at the rearmost holding position of the front filter holding portion. A rear filter holding part that is held in the gap, a dirt detection sensor that detects dirt in a filter that is provided in the gap and is held at the last holding position of the front filter holding part, and is detected by the dirt detection sensor And a notification means for generating a notification signal when the contamination reaches a predetermined threshold value.

  The first filter replacement method of the present invention is a filter replacement method in the case where the filter device has a single filter held in the rear filter holding unit, and the notification means emits a notification signal. Sometimes, remove the filter held at the front holding position of the front filter holding part, sequentially transfer the subsequent filters to the front holding position, and change the filter held at the rear filter holding part to the front filter A feature is that the rear filter holding unit is fitted with a new filter while being moved to the last holding position of the holding unit.

  The second filter replacement method of the present invention is a filter replacement method in the case where a plurality of filters are held in the rear filter holding portion in the filter device, and the notification means emits a notification signal. Sometimes, remove the filter held at the front holding position of the front filter holding section, and sequentially move the subsequent filters to the front holding position, and move the filter held at the front of the rear filter holding section to the front. The rear filter holding unit is moved to the rearmost holding position, the subsequent filters of the rear filter holding unit are sequentially transferred to the front holding position, and a new filter is mounted at the rearmost holding position of the rear filter holding unit. It is characterized by.

  In the filter exchange device according to the invention of claim 1, there is a gap between the filter held in the rearmost holding position of the front filter holding portion and the filter held in the rear filter holding portion, A dirt detection sensor for detecting dirt on the filter held at the rearmost holding position of the front filter holding part is provided in the gap, and the dirt detected by the dirt detection sensor reaches a predetermined threshold value. When the notification signal is issued, the filter held at the end of the air flow path still reaches the dirt threshold that can be detected by the dirt detection sensor. In addition, it is possible to reliably prevent air from being recontaminated due to contamination of the filter at the end of the air flow path.

  In addition, according to the filter replacement method of the second aspect of the present invention, the filter is transferred when the dirt of the filter held at the rearmost holding position of the front filter holding unit is notified. Even if the air passing through the filter is re-contaminated by the dirt trapped by the filter, the dirt is removed again when the air passes through the filter held by the rear filter holder. The released air can always be kept clean.

  Also, when the filter is informed of dirt, only one new filter is attached to the rear filter holding part, and only one filter held at the front holding position of the front filter holding part is removed and discarded. Therefore, substantially only one filter needs to be replaced with a new one, and the midway filter disposed between these two filters is moved from the downstream side to the upstream side of the air flow path. Therefore, all the filters can be used without waste until the end.

  Further, according to the filter replacement method according to the invention described in claim 3, the same effect as that of the invention described in claim 2 can be obtained, and the notification signal is generated due to the low sensitivity of the dirt detection sensor. Even when the filter is held at the rearmost holding position of the front filter holder when it is emitted and the filter needs to be held in the rear filter holder, It can be used without waste until the end.

It is sectional drawing by planar view which shows one Embodiment of the filter apparatus which concerns on this invention. It is a longitudinal cross-sectional view which shows the AA cross section of FIG. It is a cross-sectional view which shows the BB cross section of FIG. It is a schematic explanatory drawing of the filter replacement | exchange method which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view of a filter device according to an embodiment of the present invention in a plan view, FIG. 2 is a longitudinal cross-sectional view showing a cross section AA in FIG. 1, and FIG. 3 is a cross section taken along a line BB in FIG. It is a cross-sectional view.

  The filter device 1 shown in these drawings is configured as a part of an air purification device that purifies indoor air, and as shown in FIGS. 1 and 2, an inlet 2A for taking in air from the outside is provided at the front end. It has a filter housing 2 provided with an outlet 2B connected to the suction side of a blower (not shown) via a connecting pipe 3 at the rear end.

  An air flow path is constituted by the space inside the filter housing 2 from the inlet 2A to the outlet 2B, and a plurality of filters 4a to 4f are arranged in the front-rear direction in the air flow path.

  These filters 4 a to 4 f are all dry filters manufactured with the same specifications, and are composed of a rectangular filter frame 5 and a filter material 6 accommodated in the filter frame 5. Note that various types of filters such as an activated carbon filter and a HEPA filter can be used as these filters 4a to 4f depending on the place and purpose of use.

  In the filter device 1 having the structure described above, outside air (for example, indoors) is taken in from the inlet 2A side by sucking air in the air flow path of the filter housing 2 by a blower (not shown) connected to the outlet 2B side. While this air passes through the plurality of filters 4a to 4f, dust and harmful substances floating therein are filtered. The purified air is discharged from the outlet 2B of the filter housing 2 to the outside through the blower.

  In the filter device 1 of the present embodiment, among the series of filters 4a to 4f, the four filters 4a to 4d are held by the front filter holding unit 7 with the adjacent filter frames 5 being in close contact with each other. Has been.

  The remaining two filters 4e and 4f are held in a state in which the adjacent filter frames 5 are in close contact with the rear filter holding portion 8 located behind the front filter holding portion 7 and near the outlet 2B. .

  Although not shown, these filters 4 a to 4 d are each provided with a rubber band-like seal member attached to the entire rear surface of the filter frame 5 that surrounds the peripheral edge of each filter material 6.

  On the other hand, the front filter holding portion 7 has a front-rear width substantially equal to a width obtained by overlapping the four filter frames 5 of the filters 4a to 4d in the front-rear direction, and as shown in FIGS. When viewed from the rear of the filter housing 2 (on the outlet 2B side), the upper end surface, the lower end surface, and the left vertical end surface of the filter frame 5 are guided and supported. Is formed.

  Further, the rear filter holding portion 8 is also formed in a substantially U-shaped cross section when viewed from the rear of the filter housing 2 in the same manner as the front filter holding portion 7, but the front-rear width here is the filter 4e, It is substantially equal to the width of the two filter frames 5 of 4f overlapped in the front-rear direction.

  Although not shown, four filters 4a to 4d are placed in the filter frame 5 at positions corresponding to the front filter holding portion 7 on the right side wall of the filter housing 2 when viewed from the inlet 2A side. A rectangular opening of a size that can be taken in and out is formed, and the opening is normally closed by a removable lid 9A as shown in FIG.

  Further, a rectangular opening having a size that allows the filters 4e and 4f to be taken in and out is formed at a position corresponding to the rear filter holding portion 8 behind the opening of the filter housing 2. In the same manner as the above-described lid 9A, it is normally closed by a removable lid 9B.

  Filter frame receiving portions 7A and 8A are provided at the rear end portions of the front filter holding portion 7 and the rear filter holding portion 8, respectively. These filter frame receiving portions 7A and 8A are provided on the rear surface of the filter frame 5 of the filter 4d whose front surface is held at the rearmost holding position of the front filter holding portion 7, and on the rear side of the rear filter holding portion 8. It is provided to abut on the rear surface of the filter frame 5 of the filter 4f held at the holding position and to position in the front-rear direction.

  The four filters 4a to 4d held by the front filter holding portion 7 are accommodated by removing the lid 9A and sliding the filter housing 2 from the side of the filter housing 2 into the filter holding portion 7, respectively. The filter frame 5 of the filter 4 a held in contact with the vertical surface on the back side of the front filter holding unit 7 and then held at the leading holding position of the front filter holding unit 7 is placed in front of the front filter holding unit 7. The four filters 4a to 4d are pushed backward by four eccentric cams 10A arranged on the upper, lower, left and right sides of the pressing mechanism 10 described later, so that the four cams 4a to 4d are connected to the eccentric cam 10A and the filter frame receiving portion 7A. And can be fixed to the filter holding unit 7.

  At this time, the gaps between the adjacent filter frames 5 and between the filter frame 5 of the rearmost filter 4d and the front surface of the filter frame receiving portion 7A are sealed by the sealing member attached to the rear surface of each filter frame 5. The

  Similarly, the two filters 4e and 4f held by the rear filter holding portion 8 are also accommodated by removing the lid 9B and sliding the filter housing 2 from the side of the filter housing 2 into the filter holding portion 8 and receiving the respective filters. In contact with the vertical surface on the back side of the rear filter holding portion 8, and then the filter frame 5 of the filter 4 d held at the holding position on the front side of the rear filter holding portion 8 is provided in front of the rear filter holding portion 8. By pressing backward with the four eccentric cams 10 </ b> A of the other pressing mechanism 10, the filter holding unit 8 can be fixed.

  Next, since both of the pressing mechanisms 10 provided in front of the front filter holding part 7 and the rear filter holding part 8 have the same structure, only those on the rear filter holding part 8 side will be described here. To do.

  As shown in FIGS. 1 and 3, the pressing mechanism 10 includes an operation handle 10 </ b> B for simultaneously rotating the four eccentric cams 10 </ b> A at the outside of the right side as viewed from the front of the filter housing 2. Yes. The operation handle 10B is fixed to one end of a horizontal operation shaft 10C that is rotatably supported in the filter housing 2.

  A driving bevel gear 10D is fixed to the other end of the operation shaft 10C. The driving bevel gear 10D is engaged with a driven bevel gear 10F fixed to an interlocking shaft 10E that is rotatably supported around the vertical axis in the filter housing 2.

  On the other hand, a worm 10G is fixed to the interlocking shaft 10E at two locations spaced apart from each other above and below the driven bevel gear 10F. These worms 10G mesh with worm wheels 10I fixed to one end of a pair of upper and lower camshafts 10H whose both ends are rotatably supported in the filter housing 2 in parallel with the operation shaft 9C.

  Two eccentric cams 10A described above are fixed to each of these cam shafts 9H, and when the operation handle 10B is rotated clockwise, the rotation of the operation shaft 10C, the driving bevel gear 10D, and the driven gear It is transmitted to the interlocking shaft 10E via the bevel gear 10F, further decelerated between the pair of upper and lower worms 10G and the worm wheel 10I, and transmitted from the upper and lower cam shafts 10H to the eccentric cam 10A.

  As a result, a total of four eccentric cams 10A fixed to the respective camshafts 10H arranged in two upper and lower stages are synchronously rotated simultaneously in the clockwise direction in FIG. The cam surface (outer peripheral surface) of the eccentric cam 10A is in contact with the left and right front surfaces of the filter frame 5 of the filter 4e held at the head of the rear filter holding portion 8, and is moved rearward as the eccentric cam 10A rotates. The two filters 4e and 4f are fixed to the filter holding portion 8 in a state where the filter frames are in close contact with each other.

  At this time, the eccentric cam 10A receives a counterclockwise reaction torque from the side of the filter frame 5 in contact with the eccentric cam 10A, but the eccentric cam 10A naturally reverses due to the frictional resistance between the worm 10G and the worm wheel 10I. There is no end to it. On the other hand, by rotating the operation handle 10 counterclockwise, these eccentric cams 10A can be easily reversed to release the filter frame 5 from being fixed.

As shown in FIGS. 1 and 2, in the air flow path formed inside the filter device 1, a first filter that detects dirt on the filter 4 d held at the rearmost holding position of the front filter holding unit 7 is detected. The dirt detection sensor 11 is installed in a space formed by a gap between the filter 4d and the filter 4e held at the leading holding position of the rear filter holding portion 8.
In addition, a second dirt detection sensor 12 for detecting dirt on the filter 4f held at the rearmost holding position of the rear filter holding part 8 is installed behind the filter 4f holding position.

  Although not shown, the filter device 1 includes notification means for issuing a notification signal when the respective dirt detected by the first dirt detection sensor 11 and the second dirt detection sensor 12 reaches a predetermined threshold. I have.

  When the first dirt detection sensor 11 detects dirt on the filter 4d, the notice means issues a notice signal that informs that it is time to replace the filter. Here, as the notification signal, a visual display by lighting an alarm lamp or the like, an auditory display by generation of an alarm sound, sound, or the like, or both of these visual display and auditory display are combined. Can be used.

  In addition, the second dirt detection sensor 12 is provided as a supplementary safety measure when a failure occurs in the first dirt detection sensor 11 and a signal for notifying the filter replacement time is not issued. Except when the installation is obligated by rules, etc., it is not always necessary.

  That is, the second dirt detection sensor 12 cannot detect the condition that the first dirt detection sensor 11 has reached the filter 4d, and continues to use the filter device 1 as it is, so that the filter 4f on the most downstream side of the air flow path is used. When the detection sensor 12 detects that the filter 4f is dirty, a notification signal can be generated by the notification means.

  Note that the notification signal generated by the notification means differs in the type of notification signal when the first dirt detection sensor 11 detects the dirt of the filter 4d and when the second dirt detection sensor 12 detects the dirt of the filter 4f. Therefore, it is desirable to be able to notify that the first dirt detection sensor 11 is abnormal.

  Further, the notification means is not used in common with the first dirt detection sensor 11 and the second dirt detection sensor 12, but is provided independently for each of the dirt detection sensors 11 and 12, so that the notification means itself is provided. The risk of air recontamination caused by a failure can be reduced.

  Next, a filter replacement method in the filter device 1 configured as described above will be described with reference to FIG. In the figure, in order to simplify the notation of the filters 4a to 4f described above, these are indicated by a to f. X schematically represents an air flow path in the filter casing 2.

  FIG. 4A shows a state in which the filter device 1 is normally used, and external air taken into the air flow path X from the left side of the figure passes through the filters a to f. It is cleaned and discharged from the right side to the outside of the device.

  When these filters a to f have been used for a while, the dust and harmful substances in the air are gradually captured from the upstream side of the air flow path X and become dirty. Then, as shown in FIG. 5B, when the dirt of the filter 4d held at the rearmost holding position of the front filter holding part 7 reaches a predetermined threshold, the dirt detection sensor 11 detects this. In response to the detection signal, a notifying means (not shown) issues a notification signal.

  At the time when the notification signal is issued, the leading filter a located on the most upstream side of the air flow path X is extracted as shown in FIG. 10C, and then, as shown in FIG. The subsequent filter b is transferred to the holding position where the filter a is held, and the subsequent filters c and d are sequentially transferred to the front holding position.

  Then, the filter e held at the top holding position of the rear filter holding unit 8 is transferred to the last holding position of the front filter holding unit 7, and the subsequent filter f of the rear filter holding unit 8 is moved forward. The position is changed to the holding position, and a new filter g is set at the rearmost holding position of the vacant rear filter holding unit 8.

  In the embodiment described above, as shown in FIGS. 1 and 2, the front filter holding unit 7 holds the four filters 4a to 4d, and the rear filter holding unit 8 has 2 Although the filters 4e and 4f are held, the number of filters held in the front filter holding unit 7 and the rear filter holding unit 8 is not limited to this, and the rear filter holding unit 8 holds in particular. Only one filter may be used.

  Furthermore, in the present embodiment, the above-described pressing mechanism 10 uses the eccentric cam 10A. However, the present invention is not limited to this, and the pressing mechanism may be, for example, a boosting mechanism such as a screw mechanism or a toggle mechanism. You may comprise by.

  The filter device and the filter replacement method of the present invention can be used in various fields such as a chemical field, a medical field, a semiconductor field, and the like using a filter device, in addition to an air purifier for purifying indoor air.

DESCRIPTION OF SYMBOLS 1 Filter apparatus 2 Filter housing 2A Inlet 2B Outlet 3 Connecting pipe 4a-4f Filter 5 Filter frame 6 Filter material 7 Front filter holding part 8 Rear filter holding part 7A, 8A Filter frame receiving part 9A, 9B Cover 10 Pushing mechanism 10A Eccentricity Cam 10B Operation handle 10C Operation shaft 10D Driving bevel gear 10E Interlocking shaft 10F Driven bevel gear 10G Worm 10H Cam shaft 10I Worm wheel 11 First dirt detection sensor 12 Second dirt detection sensor

Claims (3)

A plurality of filters of the same specification are arranged in the ventilation direction in the air flow path through which external air is introduced from the front end, and a front filter holding unit that holds each filter interchangeably;
A rear filter holding section that has a gap with a filter held at the rearmost holding position of the front filter holding section and holds one or a plurality of filters having the same specifications as the respective filters behind the filter. When,
A dirt detection sensor for detecting dirt on the filter provided in the gap and held at the rearmost holding position of the front filter holding part;
A filter device comprising: a notification unit that issues a notification signal when the contamination detected by the contamination detection sensor reaches a predetermined threshold value. The filter device according to claim 1, wherein the filter held in the rear filter holding unit is a filter replacement method in the case of one sheet,
When the notification means issues a notification signal, the filter held at the front holding position of the front filter holding unit is removed, and the subsequent filters are sequentially transferred to the front holding position and held at the rear filter holding unit. The filter replacement method is characterized in that the filter that has been moved is transferred to the last holding position of the front filter holding section, and a new filter is attached to the rear filter holding section. The filter device according to claim 1, wherein the filter is held in the rear filter holding unit by a plurality of filters.
When the notification means issues a notification signal, the filter held at the front holding position of the front filter holding unit is removed, and the subsequent filters are sequentially transferred to the front holding position, and the head of the rear filter holding unit is moved. The filter held in the rear filter holding unit is moved to the last holding position of the front filter holding unit, and the subsequent filters in the rear filter holding unit are sequentially transferred to the front holding position, and the rear filter holding unit is held at the last. A filter replacement method comprising mounting a new filter at a position.

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