JPH10263343A - Laminated honeycomb filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated honeycomb filter having an entirely new specific function enabling to collect extremely fine powder and dust, while its effect is kept for a long period. SOLUTION: Many sheets of composite flat plates 16, 17, 18 each having an elastic porous material stuck to one side of a thin plate having an open hole part 2 having a lot of holes regularly arrayed are laminated, and all honeycomb penetration holes are formed by overlaying the open hole parts 2 while keeping specified intervals and successively sliding the parts 2 little by little without rotating to be curved or bent to laminate the composite flat plates, and at this position, the composite flat plates 16, 17, 18 are connected and fixed respectively like a comb shape on every other layer, so that one pair of mutually engaged laminated bodies is formed. One side of the pair can be slid against another side, thus the laminated honeycomb filter having a new specific function is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention maintains a function of separating and removing particulate matter floating in an air stream for a long period of time, and is effective for purifying exhaust gas, ventilating indoor air, and the like. Involved in laminated honeycomb filters with new and unique shapes.

[0002]

2. Description of the Related Art Conventionally, dust discharged from a chimney of a combustion furnace or an incinerator has been a problem as an environmental pollution. It is extremely difficult to remove, it cannot be collected by cyclone, bag filters etc. are clogged in a short time and lose their effectiveness, and electric dust collectors are large scale and costly, and each has fatal drawbacks . In addition, despite the urgent demand for the problem of black smoke removal from diesel engines, there is no appropriate solution, and the through holes in the honeycomb body are alternately closed at the inlet and outlet, and the porous body is made porous. A method using the inner wall of the through hole as a filter has been attempted. Naturally, also in this structure, the entire inner wall is clogged in a short time as in the case of the bag filter, and it is necessary to constantly oxidize and remove the soot deposited and deposited. In recent years, as seen in cedar pollen, etc., the air is very contaminated by fine particles.Especially in urban areas, it is necessary to provide ventilation in highly airtight houses, and filters must be installed at air intakes such as air purifiers. Is taking place. However, in general, the filter is more likely to be clogged with finer particles due to its properties, the filtration performance is surely deteriorated with time, and the filter must be constantly replaced.

[0003]

The present invention fundamentally solves these problems, and efficiently removes extremely fine particles such as dust in exhaust gas and air and maintains filtration ability for a relatively long time. An object of the present invention is to provide a multilayer honeycomb filter having a special shape.

[0004]

For this reason, the present invention provides a multi-layered flat plate in which a stretchable porous material is adhered to one side of a thin plate having openings in which a large number of holes are regularly arranged. The honeycomb through-holes formed from the overlap of the opening portions are all laminated with a slight shift in front, rear, left and right without rotating each so as to bend or bend while maintaining a certain interval from each other, and at this position, the composite plate Are fixed to each other in a comb shape to form a pair of laminated bodies that mesh alternately with each other, so that one can slide back and forth and left and right with respect to the other.

[0005]

As the thin plate material and the porous material of the laminated honeycomb filter of the present invention, basically any material including plastic can be used according to the purpose and economy. For example, a structure in which fibers are densely formed in a toothbrush shape on a thin plastic plate. Is effective. Naturally, metals and ceramics materials are used for the purpose of high temperature, and various combinations such as metal fibers, metal nets, and ceramic fibers for a thin metal plate are selected according to the purpose. The opening of a large number of regularly arranged holes in these plate materials is achieved very easily by continuous punching, before or after compounding with the porous material.

FIG. 1 shows an example of a laminate in which honeycomb through-holes are spirally curved. Different openings 4 in which regular hexagonal holes are hexagonally symmetrically formed in an elliptical outer frame 1 are shown. One plate is shown. These are four of a set of 32 composite plates, 3 being the first, counting from the bottom, 4 being the ninth, 5 being the 17th, and 6 being the 25th. This is the first sheet. The position of the opening 2 relative to the outer frame 1 is different for each flat plate. When 32 flat plates are stacked with the outer frame 1 coincident with each other, the opening 2 is gradually rotated from bottom to bottom without rotating. The center 8 of a certain regular hexagonal hole 7 is arranged so as to rotate clockwise along a circular circumference 9 having a constant curvature, and the connection of the holes forms a spirally curved honeycomb through-hole. You.
Such relative displacement of the opening 2 can be easily achieved by slightly shifting the relative positions of the flat plate and the punching press die by computer control.

FIG. 2 is a perspective view of an arbitrary one of the honeycomb through-holes formed when the above-mentioned 32 flat plates are stacked, as viewed from above. All the regular hexagonal holes in the opening 2 draw the same perspective view, and since all the regular hexagonal holes do not touch each other, all the individual through-holes resulting from the stacking connection of the regular hexagonal holes are all different. The inner wall will be adjacent as a partition. FIG. 3 shows a perspective view of the shape of the spiral honeycomb through-holes formed by a large number of regular hexagonal holes when they are actually stacked. FIG. 3 shows a case where the center of the regular hexagonal hole makes one turn when 16 thin plates are stacked.

In the laminated honeycomb filter of the present invention, since a large number of through-holes are curved or bent, and a part of the laminated flat plate is made of a stretchable porous material, the inner wall, that is, the partition in the honeycomb through-hole is somewhat ventilated. Have sex. Therefore, when this is installed in the passage of the combustion exhaust gas, etc., when the exhaust gas passes through the through-hole, part of the partition wall is forced to turn or bend along the partition wall due to the permeability of the partition wall, and the other part is formed in the partition wall. Will penetrate and pass through. That is, the exhaust gas receives a cyclone-like stress proportional to the square of the flow velocity and the reciprocal of the radius of curvature, and the fine dust particles floating in the exhaust gas collide with the inner wall of the through hole due to a difference in specific gravity with the gas, and partially enter. From the difference in particle diameter from the gas, the solution is filtered using the partition as a filter and adheres to the partition. The ratio between the cyclone-like action and the filter-like action of the fine particle separation is determined by the porosity and pore size of the partition wall, and is influenced by the material of the porous portion and the surface condition of the inner wall of the through hole.

FIG. 4 is a view for explaining this. One arbitrary regular hexagonal hole 7 has a center 8 and a center 11 which are adjacent to the regular hexagonal hole 10 (the adjacent hole on the left side of FIG. 7). Since the layers are spirally stacked along the circumferences 9 and 12, the gas passing therethrough receives a cyclone-like centrifugal force in the direction of the thick arrow. Since this turning radius of curvature is very small compared to cyclones, the centrifugal force becomes considerably large,
Fine particles in the gas, particularly fine particles of smoke and fine dust in the exhaust gas, collide with or penetrate the wall of the spiral through hole in the direction of the thick arrow (the left direction in the figure) and adhere thereto. The center 8 and 11 of each regular hexagonal hole is 9 along the pivot circumference 9 and 12
At the stage of moving forward by 0 degrees (moving upward in the drawing), the direction of the thick arrow is also changed by 90 degrees as shown in the figure. That is, like the cyclone, the direction of the centrifugal force always goes to the outer peripheral side of the spiral turn,
Therefore, the wall surface on which the fine dust and smoke collides and adheres is always the outer wall surface of the spiral in the spiral through hole, and hardly adheres to the opposite wall surface. Moreover, adjacent regular hexagonal holes 7 and 1
Between 0, the positive and negative pressures on both sides of the partition are reversed every 180 degrees of the spiral turn, and the direction of the flow of the gas permeating through the partition changes from 10 ← 7 to 10 → 7. A similar relationship is established between the adjacent regular hexagonal holes 13 and 14 (the adjacent hole on the upper side of FIG. 7), and similar adhesion occurs at a similar position in all the through holes of the honeycomb.

When the permeability of the porous material portion of the laminated flat plate is large, the function of the filter is more important than the function of the cyclone described above, and all the through holes are formed through the partition walls. Because they are adjacent, filtration is performed simultaneously on all through-hole partitions near the inlet. When the filtration efficiency decreases with the accumulation of dust, the operation becomes increasingly cyclonic at that position, and the filter-like operation position gradually advances toward the outlet. As a result, the same filtering action is continuously performed over a long period of time without clogging the whole at once due to adhesion and deposition of fine particles.

In the case of uniform spiral turning, continuous separation and deposition occur constantly due to centrifugal force. The smaller the radius of curvature of the spiral through hole, the greater the centrifugal force.
However, if the turning radius of curvature is smaller than half of the diameter of the through-hole, an airflow that goes straight without turning is generated. Therefore, it is not desirable that the turning radius of curvature be smaller than about half of the diameter of the through-hole. Also, depending on how the flat plate is shifted,
Honeycomb through holes can also be bent in a zigzag shape,
In this case, the airflow passing through the through-hole rapidly changes its direction at the inflection point, receives a large stress at the inflection point, and intensively adheres to the vicinity of the same inflection point of the honeycomb through-hole simultaneously.

When the present invention is applied to a diesel engine or the like, the filter deposits can be removed by heating and burning in a timely manner. However, in the present invention, as shown in FIG.
Flat plates 15, 16, 17, 18 laminated with the outer frame 1 aligned
Are connected and fixed by the supports 19 and 20 every other layer, and the two laminates can be slid while engaged with each other.
The sliding causes irregularities on the inner wall surface of the honeycomb through-hole, so that the attached fine particle deposition layer can be broken and dropped. That is,
At the time of dust collection, the honeycomb through-holes are bent or bent to deposit and deposit smoke and dust particles, and at the time of cleaning when the accumulation of particles is increased, one of the sliding laminated bodies is slid back and forth and left and right with respect to the other, and gravity is applied. Sediment can be removed mechanically by dropping or by air or water flow.

The most efficient and desirable pattern of the opening portion formed on the flat plate is a hexagonal symmetric arrangement of a regular hexagon, but the same effect can be obtained if the arrangement is regular, such as a square symmetric arrangement, a circular hexagonal arrangement or a square arrangement. Can be demonstrated. The smaller the distance between the holes, the larger the effective volume of the entire through-hole portion becomes, of course, but it is naturally limited because it cannot be made smaller than the size of the displacement when the flat plates are slightly shifted. .

[0014] The multilayer honeycomb filter of the present invention can be downsized as a whole, since the filtering surfaces are three-dimensionally dense. In addition, ordinary plastic molding technology, metal processing technology,
It can be manufactured relatively inexpensively by ceramics technology. Furthermore, smoke and dust particles gradually accumulate from the partition near the entrance to the exit partition, and even if particulate dust accumulates, the entire filtration surface is not clogged at the same time and the initial performance continues for a long time. Can be maintained. Also, even when the filtration ability is almost lost, the cyclone-like dust removing action is maintained until the honeycomb through-hole itself is clogged and closed, and the resistance of gas passing through the whole is significantly reduced over the long term as compared with ordinary air filtration materials. Can be kept. In addition, the laminated flat plates are alternately slid from time to time to remove the accumulated dust and to regenerate the filter to the initial state.

In the case of a large-sized combustion device from which a large amount of solid dust is discharged, it is desirable to install the laminated honeycomb filter of the present invention after passing through a cyclone removing device. Extremely fine particles that cannot be removed by a cyclone can be removed by the present apparatus. For air purifiers that can be used at room temperature, the entire frame including the outer frame container is made of plastic, and it is easy to design a structure that can be washed with water. If the inner wall surface of the through hole gets wet with water, the adhesion of the fine particles becomes more effective, so if it is attached to, for example, a household vacuum cleaner, it becomes possible to collect ultra fine particles that would pass through a conventional filter. . Of course, it is also easy to design the whole as a structure that can be freely disassembled.

[0016]

As described above, the laminated honeycomb filter of the present invention has a unique effect due to its special structure, and is used not only for defensive use such as air purifiers, for passive use or for use at room temperature, but also for heat-resistant dust collectors, for example. If installed near the flue gas outlet of a dust incinerator, the amount of dioxin-containing extremely fine dust that cannot be collected by a cyclone can be significantly reduced, thus preventing environmental pollution from flue gas. It has a very useful and positive meaning.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a change in the position of an opening with respect to an outer frame of a laminated flat plate.

FIG. 2 is a perspective view of any one of spiral honeycomb through-holes formed when 32 flat plate openings are stacked, as viewed from above.

FIG. 3 is a perspective view of a spiral honeycomb through hole formed by laminating the flat plate opening portions as viewed obliquely.

FIG. 4 is an explanatory diagram of an action of a centrifugal force acting on an airflow passing through a through hole.

FIG. 5 is a perspective explanatory view showing a configuration of an example of a pair of laminates that can engage with each other and slide.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Elliptical outer frame of flat plate 2 Opening part 3 1st sheet of 32 sheets of oval plates 4 9th sheet of 32 sheets 5 17th sheet of 32 sheets 6 25th sheet of 32 sheets 7 One regular hexagonal hole 8 Center of hole 7 9 Circumferential circumference of center 8 10 Regular hexagonal hole adjacent to left side of hole 7 11 Center of hole 10 12 Center 11
13 A regular hexagonal hole adjacent to the other side of the hole 7 14 Another regular hexagonal hole adjacent to the other side of the hole 7 15 A laminated flat plate on the uppermost layer 16 A laminated flat plate below the flat plate 17 Flat plate 16 The laminated plate 18 below the flat plate 18 The laminated plate below the flat plate 17 19 A support for connecting and fixing every other laminated plate 20 Other supports that form a pair with the support 19

Claims (1)

[Claims] 1. A plurality of composite flat plates, each of which has an elastic porous material of uniform thickness and is adhered to one side of a thin plate having an opening in which a number of holes are regularly arranged, are provided. The honeycomb through-holes formed from the overlap of the layers are laminated while being shifted slightly back and forth and left and right sequentially without rotating each other so as to bend or bend while maintaining a certain interval from each other at each position, and at this position, the composite flat plate is placed every other layer By connecting and fixing in a comb shape, it becomes a pair of laminated bodies that mesh alternately,
A laminated honeycomb filter characterized in that one can slide back and forth and left and right with respect to the other.