JPH0663114U - Ventilation fan filter - Google Patents

Abstract

(57) [Abstract] [Purpose] A filter having a density gradient in the air flow direction is obtained in place of the filter made of a flat plate member.
Thereby, the trapping efficiency of oil mist is improved. [Means] A paper core having a certain depth is used as a basic constituent member of a filter, and a breathable barrier having a density higher than a cell size in at least the cell opening surface on the downstream side constituting the core. A filter for a ventilation fan in which layers are formed so that the filter itself has a density gradient with respect to the air flow.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a filter for a ventilation fan for kitchens, but it can be widely used for removing oil droplets or coating floating substances floating in the air in food factories or coating factories other than the workshop. Related to naive filter.

[0002]

[Prior art and its problems]

 The conventional filter used for the above-mentioned application has a structure in which a filtration medium such as a non-woven fabric is held in a metal frame, and the filter itself is a sheet-shaped flat plate member, and None of them had a density gradient. Therefore, in order to exert a high filter function, a relatively thick non-woven fabric must be used.If it is thick, not only the pressure loss of the filter will increase, but also the following problems will occur. Occurs. That is, when a thick non-woven fabric is used, the effect of trapping and retaining oil mist is relatively good, but since the air resistance increases to that extent, it is necessary to strengthen the ventilation fan, and therefore to reduce the size and power consumption. You will not be able to meet your needs.

In particular, when a large amount of oil mist adheres to the non-woven fabric substrate, the substrate itself is not maintained in a flat plate shape, causing troubles such as sagging. On the other hand, when the non-woven fabric base material is formed to be relatively thick, it not only results in a relatively expensive product, but also has problems in post-treatment when it is thrown away.

[0004]

[Means for Solving the Problems]

 Here, the present invention intends to use a paper core having a certain depth as a basic constituent member of a filter for a ventilation fan, and uses this paper core as a strength holding member, and at least the downstream cell that constitutes the core. The feature is that an air-permeable barrier layer having a density higher than the cell size on the opening surface is formed on the opening surface so that the filter itself has a density gradient with respect to the air flow.

When the filter is provided with a depth, it is possible to increase the collection amount of oil drops, dust, and other foreign matter, and to extend the life of the filter, as described in detail below. In addition, it is preferable that the core itself is made of a material mainly composed of cellulose fiber so that oil or water adhering to the fiber is adsorbed and retained.

That is, in the filter of the present invention, a paper core is used as a strength member for maintaining rigidity, and a barrier against air flow is formed on one surface of the paper core so as to be orthogonal to the center line of each cell in the core. A layer is formed and the barrier layer is arranged on the downstream side of the passing air flow so that the filtration density gradually increases as a filter from the upstream side to the downstream side. With such a structure, it is intended to enhance the trapping efficiency of the mist even when the barrier layer is formed relatively thin or coarse. The barrier layer may be made of a mesh material other than non-woven fabric, such as a gauze cloth, and defibrated pulp fibers may be attached to the surface opposite to the paper core on which the barrier layer is formed. Alternatively, the invention also includes a device in which the paper core is made of aluminum hydroxide paper.

[0007]

[Action]

 Of the oil droplets flowing from the upstream side of the paper core that constitutes the main body of the filter, the relatively large oil droplets adhere to the wall surface of the core and are absorbed, and at the same time, the core portion has an oil droplet retaining action. Also runs. On the other hand, the fine oil droplets that have passed through the core are captured by the barrier layer of the non-woven fabric or the reticulate body located on the downstream side of the core to purify the passing air flow. When the pulp fiber is sprayed on the end surface or the wall surface of the core, the pulp fiber catches the oil droplets, so that the oil mist capturing efficiency is further enhanced.

[0008]

[Embodiment] One of the features of the present invention is that the paper core 10 is used as a member for providing rigidity as a filter and forming a density gradient. Therefore, the type of paper core used is not limited. That is, it is possible to use a paper core having an arbitrary shape such as the honeycomb core 1 or the roll core 2 as shown in the drawing, or the square core 3 having a lattice-like form as shown in FIG. . In addition, as shown in FIG. 4, the corrugated ball laminate 4 may be sliced along a cutting line 5 or the like so that the hollow corrugated core 4a is exposed at the end face. The individual cell diameters of the paper core can be freely set, but preferably the cell diameter is about 3 to 20 mm. Also, regarding the thickness (height h) of the core itself, the greater the height, the more effective it is, but since it becomes more difficult to attach it to the ventilation fan, it is about 10 mm or less, preferably about 6 to 8 mm. It is better to

Next, the material of the paper core is not particularly limited, and a sheet / nonwoven fabric laminate or other sheet made of natural fiber, synthetic fiber or inorganic fiber may be used. Flame-retardant aluminum hydroxide paper is preferably used.

By the way, in the present invention, as an example, a non-woven fabric or a mesh body (metal, glass cloth) is formed on one end face 10a of the core of the paper core 10 in the direction orthogonal to the center line c of the cell 11. A barrier layer 15 having air permeability, which is made of any material such as resin or plastic), and is arranged so as to be located on the downstream side of the passing airflow when in use. That is, as shown in FIG. 5, the barrier layer 11 is formed on the end surface of the core of the ventilation fan facing the fan 20. As the barrier layer, a plain weave mesh body such as a ginseng cloth may be used, and it is preferable that the mesh body has a mesh size of about 10 to 20 mesh.

When a nonwoven fabric is used as the barrier layer, a nonwoven fabric having a thickness of about 10 to 50 g / m ² is suitable, and has a higher oil mist trapping effect than the case where the mesh body is used. By the way, it is possible to reduce the initial pressure loss by making the non-woven fabric or the net-like body constituting the barrier layer 11 as thin as possible or by using a coarse one.

To describe a further preferred embodiment, as shown in FIGS. 5 and 6, not only the barrier layer 11 is provided on one surface of the core body 10 as a base material, but also the other end surface (upstream side) of the core 10 is provided. The open pulp fibers 12 are evenly adhered to the end faces) by using a kind of flocking means. That is, as an example, the end face portion is previously coated with or impregnated with a vinyl acetate-based adhesive, and then the above-mentioned pulp fiber is sprayed onto the coated surface, and then the adhesive is dried. Feathers are planted on the end surface of the core. As a result, dust such as oil mist contained in the air sucked by the ventilation fan is effectively captured by the flocked fibers, so that even if the barrier layer itself is thinned or roughened to reduce the pressure loss. It does not lower the collection efficiency of mist.

As described above, the pulp fibers are sprayed on the surface opposite to the surface on which the barrier layer is arranged, but it is preferable to consider so that the pressure loss does not become too large. In that case, the sprayed pulp fibers may be inserted into the cells of the core.

Further, as the constituent material of the barrier layer in the present invention, an inorganic fiber such as glass fiber can be used, but it is preferable to use a material mainly composed of cellulose because of better oil absorption. Furthermore, a barrier layer 11 may be provided on both the upstream end face and the downstream end face of the paper core 10. In that case, for example, the upstream side density is 5 to 10 mesh, and the downstream side It is necessary to have a density gradient, such as 10 to 20 mesh.

[0015]

Example 1 An aluminum hydroxide paper having a basis weight of 140 g / m ² (paper composed of 50% aluminum hydroxide, 25% pulp and 25% rock wool) has a cell diameter of 8.5 mm and a height of 7 mm. Roll core was prepared, and then a non-woven fabric composed mainly of wood pulp having a weight of 15 g / m ² was applied in the direction orthogonal to the center line of each cell of the core.

The above structure was cut into a square having a side of 30 cm and attached as a filter for a ventilation fan in a kitchen. After using it for 3.5 months, I removed it and examined the ventilation fan, but almost no oil stains were observed.

[0017]

Example 2 In the filter base material described in Example 1, a mesh of glass wool of 5 mesh was attached to one end surface of the paper core, and vinyl acetate emulsion was applied to the other end surface of the paper base. The opened wood pulp was sprayed and dried at a rate of 10 g / m ² . This structure was cut into a square measuring 30 cm on a side and used as a filter for a ventilation fan in the kitchen. After using it for 3.5 months, I removed it and looked at the ventilation fan, but there was little oil stain.

[0018]

EFFECTS OF THE INVENTION Not only is oil drop trapping efficiency good, but a product with high holding power and durability is obtained. Also, since the main body of the filter is composed of a paper core, it not only has rigidity, but it is easy to handle when attaching and detaching, and is suitable for single use. The paper core is mainly used, and at least one end surface of the paper is provided with a pariya layer having a density higher than the cell size of the core, and a two-stage filtration is performed with a density gradient. Compared with the filter consisting of the flat member, the dust removal effect is much higher and the oil mist trapping efficiency is also superior. Small pressure loss and high suction effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a filter according to an embodiment of the present invention.

FIG. 2 is a perspective view of a filter showing another embodiment of the same.
The case where a gauze paste is applied as a barrier layer is shown.

FIG. 3 is a perspective view of a filter which is also formed by using a grid-shaped paper core and attaching a non-woven fabric to one surface thereof.

FIG. 4 is an explanatory view showing a case where the filter of the present invention is manufactured from a laminated body of single-sided balls.

FIG. 5 is a vertical cross-sectional view showing a state in which a nonwoven fabric is attached to one surface of a core, and wood pulp fibers are sprayed on the other surface to be flocked, and the nonwoven fabric is attached to the fan side of a ventilation fan.

FIG. 6 is a plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Honeycomb core 2 Roll core 3 Square core 4 Tier ball laminated body 4a Corrugated center part 5 Cutting line 10 Paper core 10a End face 11 Barrier layer 12 Opened pulp fiber 20 Fan

Claims (6)

[Scope of utility model registration request] 1. A barrier layer provided with a paper core having a cell diameter of 3 to 20 mm and a cell height of 5 to 10 mm on the upstream side, and having a gas permeability higher in density than the paper core on the downstream side. And a filter-a ventilation fan filter characterized by having a density gradient in itself. 2. The filter for a ventilation fan according to claim 1, wherein the barrier layer has a higher density than the cell size of the paper core. 3. A filter for a ventilation fan according to claim 1, wherein pulp fibers are adhered to the opposite surface of a paper core having a barrier layer made of a non-woven fabric or a mesh. 4. A filter for a ventilation fan according to claim 1, wherein the open fiber surface of the paper core on the upstream side is provided with defibrated pulp fibers or a mesh having a mesh coarser than the barrier layer on the downstream side. . 5. The filter for a ventilation fan according to claim 1, wherein the barrier layer is made of a non-woven fabric made of wood pulp or a gauze cloth. 6. The ventilation fan filter according to claim 1, wherein the paper core is made of aluminum hydroxide paper.