JP5049851B2 - Heat resistant filter - Google Patents

Description

  The present invention relates to a heat-resistant air filter that can be used at high temperatures and used for circulating air cleaning such as a dryer or exhaust gas treatment for an incinerator.

  Conventionally, as this type of heat-resistant air filter, for example, as disclosed in Patent Document 1, a double seal layer composed of a cushion material layer such as glass cotton and an adhesive layer is provided between a filter pack and a filter frame. An interposed heat-resistant air filter is known. And the said adhesive bond layer was comprised with the heat resistant adhesive which consists of a silicone resin etc. in order to meet the request | requirement of heat resistance. Further, as disclosed in Patent Document 2, a ceramic adhesive is interposed between a filter pack and a filter frame.

Japanese Utility Model Publication No. 61-44214 JP 2005-13796 A

When the silicone resin adhesive is used, siloxane gas is generated during use. This siloxane gas has the property of changing the hydrophilicity to water repellency, and the generated siloxane gas is particulated on the cleaned downstream side to cause contamination. Further, when the ceramic adhesive is used, there is a problem that leakage occurs due to the crack of the adhesive. That is, by repeating expansion and contraction when the temperature rises and drops during use, the difference in expansion and contraction between the ceramic adhesive and the filter frame made of metal or the filter pack made of glass fiber, Since it cannot follow expansion and contraction, a crack occurs in the ceramic adhesive. In addition, as a countermeasure against the difference between the expansion and contraction rate, glass cotton was coated with glass fiber paper separately from the ceramic adhesive on the metal filter frame side between the metal filter frame and the glass fiber filter pack. Attempts have been made to seal by providing a sealing material. However, there has been a problem of dust generation due to peeling of the ceramic adhesive due to thermal deterioration.
Further, when such an adhesive sealant is not used, it is necessary to use a reinforcing plate in order to prevent the filter medium constituting the filter pack from being biased or falling down during use. In addition, there has been a problem that the efficiency performance of the filter deteriorates due to such a reinforcing plate itself falling or slipping.
The heat-resistant air filter of the present invention has been made by paying attention to the problems of the prior art, and its purpose is heat resistance that is excellent in productivity and satisfies a collection efficiency of 99.97% (at 0.3 μm) or more. The object is to provide an air filter.

In order to achieve the above object, the heat-resistant air filter of the present invention comprises a plurality of sheet-like sealing materials made of glass cotton having an average fiber diameter of 1 μm or less so as to have a basis weight of 65 g / m ² or more. overlaid with the sheet-like seal material, waveform separator pleated filter paper, or between the filter pack and the vertical filter frame formed by the distance maintaining the ribbon a heat air filter sealed respectively, said upper and lower filter frame A boat portion comprising ribs extending in parallel with the openings in the upstream and downstream directions of the air filter is provided, and a hook plate provided on the reinforcing plate is engaged with the reinforcing plate interposed in the filter pack. In this state, it is placed on the boat portion, and the reinforcing plate is sandwiched and fixed between upper and lower filter frames .
The heat-resistant air filter according to claim 2 is characterized in that, in the heat-resistant air filter according to claim 1, at least one of the sheet-like sealing materials covers the tip of the pleat of the filter pack.

According to the present invention, a plurality of sheet-like sealing materials made of glass cotton having an average fiber diameter of 1 μm or less are stacked so as to have a basis weight of 65 g / m ² or more, and the filter paper is pleated with the sheet-like sealing material to corrugate separators. Alternatively, since the gap between the filter pack and the upper and lower filter frames that are held with a ribbon is sealed, the glass fibers constituting the glass cotton are sufficiently fine and have adequate flexibility. Glass cotton can be spread so as not to make a gap between the filter pack and the surface of the filter pack.
Further, since the sealing property is good in this way, the collection efficiency of 99.97% (at 0.3 μm) or more can be satisfied. In addition, since it is not necessary to use an adhesive, the problem of siloxane gas and the problem of leakage due to cracks such as ceramic adhesive do not occur.
Also, the upper and lower filter frames are provided with a boat portion made of ribs extending in parallel to the openings in the upstream and downstream directions of the air filter, and a reinforcing plate interposed in the filter pack is provided on the reinforcing plate. parts placed on the radical 137 while remaining engaged with the ribs. Thus fixed across the reinforcing plate at the upper and lower filter frame, the hook portion of the reinforcing plate and ribs of the radical 137 firmly engaged And the reinforcing plate does not shift back and forth with respect to the filter pack. In other words, when there is no adhesive between the filter pack and the filter frame, the reinforcing plate is only sandwiched and fixed between the upper and lower filter frames. Although the problem that efficiency performance falls is produced, since a reinforcement board does not shift | deviate back and forth with respect to a filter pack, when a filter pack is biased at the time of use, it does not fall down, and the problem which efficiency efficiency falls does not arise.
Further, when at least one of the sheet-like sealing materials is covered to the pleat tip of the filter pack, even if a gap is generated between the sealing material and the filter pack due to impact or the like, at the pleat tip of the filter pack, Since the gap can be filled with the sheet-shaped sealing material, a reliable sealing property can be obtained.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an exploded perspective view of an embodiment of the heat-resistant air filter of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
In the figure, reference numeral 10 denotes a filter frame, in which a filter pack 20 is accommodated.
The filter frame 10 is formed in a rectangular frame shape with upper and lower filter frames 11 and 12 and side frames 13 and 14, and each of the frames 11, 12, 13, and 14 is made of aluminum, steel plate, stainless steel, or the like. In particular, considering heat resistance, it is preferable to use austenitic stainless steel, SUS304 series, SUS430, or the like. The upper and lower filter frames 11 and 12 are provided with ribs 11a, 11a, 12a, and 12a that extend in parallel to the openings in the upstream and downstream directions of the air filter, respectively, and a boat including these ribs 11a, 11a, 12a, and 12a. Portions 11b and 12b are formed. The ribs 11a, 11a, 12a, and 12a are made of aluminum, steel plate, stainless steel, and the like, similar to the frames 11, 12, 13, and 14, and austenitic stainless steel, SUS304, SUS430, etc. It is preferable to comprise. The rib ribs 11a, 11a, 12a, 12a are fixed to the upper and lower filter frames 11, 12 by welding.

  Moreover, as the filter pack 20, a filter paper such as glass fiber or synthetic fiber can be pleated, and a corrugated separator or a ribbon held at intervals can be used. It is preferable that the heat-resistant glass fiber filter paper 21 is pleated and held by a corrugated separator 22 made of metal such as aluminum alloy or stainless steel.

  Two reinforcing plates 23 are interposed using the folding space of the heat-resistant glass fiber filter paper 21 of the filter pack 20, and hook portions 23a are provided on the upper and lower ends of one side of each reinforcing plate 23. , 23a are provided. In the present embodiment, each reinforcing plate 23 interposed in the filter pack 20 is in a state where the hook portions 23a, 23a provided on the reinforcing plate 23 are engaged with the ribs 11a, 11a, 12a, 12a. It mounted on the said boat parts 11b and 12b, and it was made to fix each reinforcement board 23 mounted in this way on both sides of the upper and lower filter frames 11 and 12. FIG.

In the present invention, a plurality of sheet-like sealing materials 30 made of glass cotton having an average fiber diameter of 1 μm or less are stacked so as to have a basis weight of 65 g / m ² or more . With this sheet-like sealing material, the filter pack 20 and the upper and lower filter frames are stacked. 11, 12 between was to seal each.
In the example shown in the drawing, two sheet-like sealing materials 30a for covering are covered to the tip of the pleats of the filter pack 20, and sealing is performed in a state where four sheet-like sealing materials 30b for lamination are further laminated thereon. . As the covering sheet-like sealing material 30a and the laminating sheet-like sealing material 30b, a cotton-like (short fiber) raw material made into a non-woven fabric can be used. In particular, when considering heat resistance, the density is 30 to 230 g / those nonwoven glass fiber m ³ dry is preferred.

Next, a method for assembling the heat-resistant air filter will be described with reference to FIGS.
First, as shown to Fig.2 (a), the lower filter frame 12 with the boat part 12b by the rib 12a is prepared.
Next, as shown in FIG. 2 (b), the two reinforcing plates 23 are interposed in the filter pack 20 and carried to above the lower filter frame 12.
Next, as shown in FIG. 2C, the hook portion 23a of the reinforcing plate 23 is placed on the boat portion 12b in a state of being engaged with the ribs 12a and 12a forming the boat portion 12b.
Next, as shown in FIG. 2 (d), two sheet-shaped sealing materials 30 a for covering are covered so as to cover the four circumferences of the pleat portion of the filter pack 20.
Next, as shown in FIG. 2 (e), four sheet-like sealing materials 30b for lamination are further laminated on the sheet-like sealing material 30a for covering.
Next, as shown in FIG. 2 (f), the upper filter frame 11 is placed from above the filter pack 20 so that the hook portion 23 a and the rib portion 11 a of the reinforcing plate 23 are engaged, and the upper filter frame 11 and the filter Complete the seal with the pack 20.
Next, as shown in FIG. 2G, the air filter is inverted, the lower filter frame is temporarily removed, and the seal between the lower filter frame and the filter pack is completed in the same manner as described above. Complete the air filter as shown in h).

Next, examples of the present invention will be described with reference to comparative examples.
Example 1
A filter frame made of SUS430 having a length of 292 mm, a width of 1000 mm, and a height of 760 mm was formed using the upper and lower filter frames and the side frames with the boat portion (rib height 10 mm). In addition, a very fine C glass fiber filter paper was pleated, and a filter pack having a length of 273 mm, a width of 960 mm, and a height of 715 m was formed by holding a gap with an aluminum alloy separator having a thickness of 60 μm. In the filter pack, two reinforcing plates with a hook portion made of SUS304 having a thickness of 1.2 mm × length of 714 mm × width of 260 mm were interposed. Then, three sheet-like sealing materials for lamination having a basis weight of 26.5 g / m ^{2 and} a weight of 273 m × width of 960 mm made of C glass fibers having an average fiber diameter of 0.6 μm are laminated between the filter pack and the upper and lower frames. The air filter was completed. At this time, the basis weight of the glass cotton was 159 g / m ² .

( Reference example )
Sealing was performed in the same manner as in Example 1 except that the use of a reinforcing plate without a hook portion was used, and an air filter was completed. At this time, the basis weight of the glass cotton was 79.5 g / m ² in each of the upper and lower sides , and the total weight was 159 g / m ² .

(Example 2 )
Two coating sheet-like seal material in the longitudinal 313 mm × horizontal 980mm having a basis weight of 8.13 g / ^{m 2} consisting of C glass fibers having an average fiber diameter of 0.6 .mu.m, covered up to the pleat tips of the filter pack, further said thereon Sealing was carried out in the same manner as in Example 1 except that four sheet-like sealing materials for lamination were laminated and sealed to complete an air filter. Basis weight of the glass wool in this case the upper and lower 168 g / ^{m 2,} was 336 g / ^{m 2} in total.

(Comparative Example 1)
Sealing was performed in the same manner as in Example 1 except that the fiber diameter of the laminating sheet-like sealing material was changed to that of 1.3 μm, and an air filter was completed. The basis weight of the glass cotton at this time was 420 g / m ² .
(Comparative Example 2)
Sealing was carried out in the same manner as in Example 1 except that the number of sheet-like sealing materials for lamination was changed to two, thereby completing an air filter. The basis weight of the glass cotton at this time was 106 g / m ² .

Next, the characteristics and the like of the obtained air filter were evaluated, and the evaluation results are shown in Table 1 below.
Each evaluation item was evaluated as follows.
1) Generation of silicone gas: Gas generation analysis (TENAX-GR collection + GC / MS analysis was performed, and generation of TOC and siloxane was confirmed.
The case where no siloxane gas was generated was marked with ◯, and the case where there was no siloxane gas was marked with ×.
2) Adhesive crack generation: A heat cycle test (250 ° C. × 8 hours—30 ° C. × 4 hours, 10 cycles) was performed, and the seal portion was visually observed.
The case where there was no crack was indicated by ○, and the case where there was no crack was indicated by ×.
3) Vibration test: The air filter was packed in corrugated board, and the vibration test was performed under the following conditions in accordance with JIS 0232.
Appearance and performance (pressure loss, collection efficiency) were measured before and after the test with an air volume of 88 m ³ / min to confirm the presence or absence of significant changes.
Those with no significant change were marked with ◯, and those with no marked change.
4) Pressure and heat resistance test: Ventilated at 750 Pa and 250 ° C. for 1 hour at an air volume of 88 m ³ / min, and the performance (PAO) before and after the test was measured.
Those with 99.99% or more were marked with ◎, those with less than 99.99% and 99.97 or more were marked with ○, and those with less than 99.97% were marked with ×.

From Table 1 above, when a plurality of sheet-like sealing materials made of glass cotton having an average fiber diameter of 1 μm or less are stacked so as to have a basis weight of 130 g / m ² or more, good heat-resistant sealing properties can be obtained, It is clear that a better heat-resistant sealing property can be obtained when at least one of the sealing materials is covered to the pleat tip of the filter pack. In addition, when the hook portion of the reinforcing plate interposed in the filter pack is sealed in a state where it is engaged with the ribs of the upper and lower filter frames, it is clear that the filter pack is not displaced and has excellent impact resistance. is there.

Disassembled perspective view of heat-resistant air filter of the present invention Explanatory drawing which shows the assembly process of this invention heat-resistant air filter AA line sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Filter frame 11 Upper filter frame 11a Rib 11b Boat part 12 Lower filter frame 12a Rib 12b Boat part 13,14 Side plate 20 Filter pack 21 Heat-resistant glass fiber filter paper 22 Corrugated separator 23 Reinforcement plate 23a Hook part 30 Sheet seal Material 30a Sheet-like sealing material for covering 30b Sheet-like sealing material for laminating

Claims (2)

A plurality of sheet-like sealing materials made of glass cotton having an average fiber diameter of 1 μm or less are stacked so as to have a basis weight of 65 g / m ² or more . With this sheet-like sealing material, the filter paper is pleated and spaced with a corrugated separator or ribbon. a holding a filter pack comprising between the upper and lower filter frame to a heat-air filter sealed respectively, said upper and lower filter frame, a radical 137 consisting of ribs extending parallel to each opening of the vertical flow direction of the air filter A reinforcing plate interposed in the filter pack is placed on the boat portion with a hook portion provided on the reinforcing plate engaged with the rib, and the reinforcing plate is sandwiched between upper and lower filter frames. A heat-resistant air filter characterized by being fixed .   2. The heat-resistant air filter according to claim 1, wherein at least one of the sheet-like sealing materials covers the tip of the pleat of the filter pack.

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