JP2520899Y2 - filter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter. More specifically, the present invention relates to a filter that can be suitably used in an electric dust collector, an air purifier, etc. to mechanically and electrostatically trap dust.

[0002]

2. Description of the Related Art Conventionally, for example, in an electrostatic precipitator,
A means for collecting dust by passing it between the discharge electrodes to charge it and collecting it by the collecting electrode is taken, and the dust not collected by the collecting electrode is removed by using a filter (Japanese Patent Laid-Open No. 56-56- 37060
Issue). However, such an electrostatic precipitator is
Since the dust charging section and the filter section are required, the apparatus itself becomes large-scale. Therefore, the development of an electrostatic precipitator that is as compact and compact as possible has been desired.

Therefore, a filter has been developed which can generate an electric field in the filter itself to make it dielectric and to electrically attract and collect dust (Japanese Patent Laid-Open No. 58-92471, Japanese Utility Model Publication No. 1-10).
No. 7441), the use of the filter does not require a dust charging unit, and therefore the size of the electric dust collector can be reduced and the dust collection efficiency can be improved. The advantage is that However, since the filter is of a type that allows air containing dust to directly pass through the filter, it has the drawbacks of large pressure loss and easy clogging.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and it is of course excellent in dust collection efficiency, and is unlikely to cause clogging and has a small pressure loss. Intended to provide a filter.

[0005]

SUMMARY OF THE INVENTION The present invention is a non-woven fabric and a non-woven fabric.
A cloth and a non-woven cloth are laminated with a spacer interposed therebetween.
Collects dust in the air by passing air between
A filter, wherein the upper surface and the lower surface of the nonwoven fabric are respectively
The present invention relates to a filter provided with a linear or strip-shaped electrode made of a conductive resin .

[0006]

FUNCTION AND EXAMPLE As described above, the filter of the present invention is made by laminating the non-woven fabric and the non-woven fabric via the spacer.
Air is passed between the nonwoven fabric and the nonwoven fabric
A filter for collecting dust in the air, which is on the non-woven fabric
Is the surface or bottom surface made of a linear or strip-shaped conductive resin?
It is provided with an electrode .

According to the filter of the present invention, when air containing dust passes between the laminated non- woven fabrics, the dust is charged and attracted to the electrodes. Further, since the non-woven fabric is dielectricized by the formation of the electric field by the electrodes, the dust is also adsorbed by the non-woven fabric, and the dust collection efficiency is improved. Further, since air containing dust passes between the laminated nonwoven fabrics, there is an advantage that the pressure loss is extremely small.

Examples of the non-woven fabric forming method of the non-woven fabric used in the present invention include a fiber bonding method (fiber bonding method), a point bonding method, a needle punching method, and a hydroentangling method. Among them, the hydroentangling method is used. Is
This is a particularly preferred method because it does not impede the chargeability of the resulting non-woven fabric because it does not adhere to oily substances.

As the fibers used for the non-woven fabric, for example, polyester fibers, polypropylene fibers, polyethylene fibers, polypropylene-polyethylene composite fibers,
Examples thereof include composite fibers having a sheath component of polyester or polyamide, and these fibers may be used alone or in combination of two or more kinds. In the present invention, it is preferable that the non-woven fabric contains at least 50% by weight of synthetic fibers such as polyester and polypropylene because the non-woven fabric is provided with the dielectric property when charged and the dust collecting effect is improved.

The thickness of the non-woven fabric cannot be unconditionally determined because it depends on the method of forming the non-woven fabric. However, when the filter of the present invention is used, for example, as a dust collecting filter of an electrostatic precipitator, It is preferably about 5 mm.

The conductive resin provided on the upper surface and the lower surface of the non-woven fabric are, for example, graphite, carbon black,
It is composed of conductive powder such as silver, copper and nickel and synthetic resin such as phenol resin, epoxy resin, acrylic resin, styrene resin and vinyl acetate resin.

The blending ratio of the conductive powder and the synthetic resin varies depending on the type of the conductive powder used, but the weight ratio is 15:85 to 98: 2, especially 20:80 to 90:10. Is preferred. When the compounding ratio of the conductive powder is smaller than the above range, the specific resistance exceeds 10 ⁶ Ω · cm, which tends to be unsuitable for use as an electrode, and when larger than the above range. However, the conductive powder may not be held stably and may fall off, resulting in disconnection.

The conductive resin may be a resin such as polyacetylene having conductivity.

The conductive resin can be used as, for example, paints such as organic solvent-based paints, water-soluble paints, emulsion-type water-soluble paints, inks and the like. In this case, the viscosity (25 ° C) is preferably 10000 cP or more so as not to penetrate when applied to the non-woven fabric, and 100000 cP or less so as to facilitate the application. Is desirable. After applying these paints and the like to the non-woven fabric, it is dried to remove the solvent to form an electrode made of a conductive resin.

There is no particular limitation on the form of adhesion of the conductive resin, but it is usually formed in a linear or strip shape. Also,
The width is arbitrary as long as it does not extremely reduce the filtration area of the non-woven fabric, but is usually 2 to 10 mm, preferably about 3 to 6 mm. When the width is smaller than the above range, it is easy to cause disconnection, and when the width is larger than the above range, the non-woven fabric may be unevenly filtered depending on the distance between the electrodes. Become. The shape of the electrode is not particularly limited, and examples thereof include a straight shape, a curved shape such as a wavy line, and a lattice shape, but the present invention is not limited to such a shape.

The electrode provided on the surface of the filter is used as a high voltage electrode and a ground electrode, or as an anode and a cathode by being connected to a power source via a lead wire or the like or grounded.

In the present invention, it is preferable to arrange the same poles on each surface of the non-woven fabric so that the electric field is formed between the electrodes on both surfaces and the non-woven fabric is dielectricized by the electric field. It is particularly preferable because the non-woven fabric can improve the electric attraction of dust.

The filter of the present invention is formed by laminating non-woven fabrics provided with electrodes on the upper and lower surfaces thereof, respectively. However, the non-woven fabrics are prevented from contacting each other so that air containing dust passes between the non-woven fabrics. The non- woven fabric and the non- woven fabric are provided via a spacer. Examples of such spacers include synthetic resin films, synthetic resin plates, paper, and the like having insulating properties, such as polyethylene, polypropylene, ABS resin, and polyester. In addition, the cross-sectional shape of the spacer is arbitrary as long as a gap is formed so that air containing dust can pass between the non-woven fabrics. For example, when the non-woven fabric is a flat plate-shaped spacer, for example, a corrugated plate-shaped spacer is used. Alternatively, a spacer having a convex portion formed on the surface may be used.

The number of laminated layers of the non-woven fabric is not particularly limited and may be appropriately adjusted depending on the application of the filter of the present invention. The number of laminated non-woven fabrics is usually about 2 to 30.

The present invention of the filter may be one which is a flat or corrugated nonwoven fabric and nonwoven fabric are laminated through a spacer, also is a nonwoven fabric and the nonwoven fabric is laminated in a spiral form via a spacer It may be In the latter case, there is an advantage that processing is easier than in the former case.

Since the filter of the present invention has air permeability in the gap between the non-woven fabrics, it has an advantage that the pressure loss is small as described above. If the gap between the non-woven fabrics is too large, the dust collection efficiency will decrease, and if it is too small, the pressure loss will increase, which may depend on the application of the filter of the present invention. ,
Usually, the gap is preferably about 1 to 6 mm.

The filter of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the filter of the present invention in which two layers of non-woven fabric are laminated. In the filter shown in FIG. 1, the upper surface of the electrodes 1 and 2 and the nonwoven fabric 3
And formed on the lower surface, respectively . A spacer 4 is provided between the two non-woven fabrics 3 in order to prevent the non-woven fabrics 3 from directly contacting each other and at the same time to provide a gap so that air containing dust can pass through.

In the present invention, electrode 1 and electrode 2
When the electrode 1 and the electrode 2 are alternately arranged as seen in FIG. 1 when seen through from a direction perpendicular to the surface of the nonwoven fabric 3, the distance between the electrodes becomes long. It is preferable that the electric field forming region is expanded so that the non-woven fabric 3 exhibits a uniform dust collecting action, and at the same time, a short circuit between the electrodes 1 and 2 can be prevented.

Although the distance between the electrodes 1 and 2 is arbitrary, 2 to 50 mm is suitable for preventing a short circuit and forming a good electric field, and the potential difference between the electrodes is It is preferably 0.2 to 1.0 KV / mm, especially 0.5 to 0.9 KV / mm.

FIG. 2 is a cross-sectional view showing another embodiment of the filter of the present invention in which three layers of non-woven fabric are laminated. In the filter shown in FIG. 2, flat spacers 4 are provided between corrugated nonwoven fabrics 3. As described above, in the present invention, it is sufficient that a space through which air containing dust can pass is formed between the three nonwoven fabrics 3, and the shapes of the nonwoven fabrics 3 and the spacers 4 are not particularly limited.

FIG. 3 is a sectional view showing another embodiment of the filter of the present invention in which three layers of non-woven fabric are laminated. In the filter shown in FIG. 3, spacers 4 having protrusions are provided between three flat plate-shaped nonwoven fabrics 3. The shape of the protrusion of the spacer 4 is not particularly limited, and examples thereof include those having a triangular or quadrangular cross section.

FIG. 4 is a sectional view showing another embodiment of the filter of the present invention. In the filter shown in FIG. 4, the non-woven fabric 3 is spirally laminated with a corrugated plate-shaped spacer 4 interposed therebetween. Since the filter in which the nonwoven fabric 3 shown in FIG. 4 is laminated in a spiral shape has an advantage that it is easier to process than the flat filter shown in FIGS. Especially preferred.

Next, the filter of the present invention will be described in more detail based on embodiments, but the present invention is not limited to such embodiments.

Example 1 A polypropylene non-woven fabric having an average fiber diameter of 2 μm, a basis weight of 60 g / m ² and a thickness of 0.5 mm, which was produced by a melt-blowing method, and a basis weight of 2 deniers, a polyclar fiber and a modacrylic fiber, having a basis weight of 120 g / m ^2. , A 1.1 mm thick non-woven fabric laminated by a dry method, and made of a conductive material composed of 20 parts by weight of carbon black and 80 parts by weight of acrylic resin (solid content) so that the electrodes are arranged as shown in FIG. A resin emulsion type water-soluble paint was applied on the surface of the non-woven fabric in parallel lines having a width of 2 mm and a line interval of 16 mm, and dried to form electrodes.

Next, using a corrugated plate made of polypropylene as a spacer (thickness: 4 mm, plate thickness: 1 mm), it was spirally laminated to obtain a filter of the present invention having a diameter of 10 cm and a length of 10 cm. The cross-sectional shape of the obtained filter was similar to the cross-sectional shape of the filter shown in FIG.

The electrode on the air flow inflow side was used as a ground electrode as a ground electrode, and the electrode on the air flow outflow side was connected to a power source as a high-voltage electrode, which was charged under the condition that the average potential difference between the electrodes was 0.8 KV / mm.

In the above process, the electrode can be easily formed on the non-woven fabric simply by applying the coating material of the conductive resin and drying it, and the electrode is not damaged even if it is spirally laminated. .

A perspective view of the obtained filter is shown in FIG.

The operation of the filter shown in FIG. 5 is as follows. When the air flow containing dust passes through the gap of the nonwoven fabric 3, the dust is charged and attracted to the electrodes 1 and 2. Since the electrodes 1 and 2 are formed on the surface of the nonwoven fabric 3, the dust attracted to the electrodes is retained in the nonwoven fabric around the electrodes. Also,
At this time, since the non-woven fabric 3 itself is dielectricized by the formation of an electric field by the electrodes 1 and 2, dust is efficiently collected by the non-woven fabric 3 by electric adsorption.

Since the dust particles are charged to the same polarity, the dust particles do not agglomerate closely with each other, and even if the dust particles adhere to the filter, there are gaps formed by spacers between the nonwoven fabrics. Therefore, there was almost no increase in ventilation resistance and pressure loss due to clogging.

[0037]

EFFECTS OF THE INVENTION The filter of the present invention has the effect of charging dust while the air stream containing dust passes through the gap between the nonwoven fabrics, attracting it to the electrodes, and efficiently holding it in the nonwoven fabric to which the electrodes are attached. Play. Further, when holding dust, the nonwoven fabric has an effect of holding a large amount of dust because it has a three-dimensional porous structure.

Further, when the filter of the present invention is used, since the non-woven fabric is dielectricized by the formation of an electric field by the electrodes existing on both surfaces, dust is electrically adsorbed. The efficiency of collecting dust can be improved.

Therefore, the filter of the present invention has the effect of efficiently collecting dust in the non-woven fabric in the state where the pressure loss is extremely small because the air containing the dust flows in the gap between the non-woven fabrics.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a filter of the present invention.

FIG. 2 is a sectional view showing an embodiment of the filter of the present invention.

FIG. 3 is a sectional view showing an embodiment of the filter of the present invention.

FIG. 4 is a sectional view showing an embodiment of the filter of the present invention.

FIG. 5 is a perspective view showing an embodiment of the filter of the present invention.

[Explanation of symbols]

 1 electrode 2 electrode 3 non-woven fabric 4 spacer

Claims (2)

(57) [Scope of utility model registration request] 1. A non-woven fabric and a non-woven fabric via a spacer
It is laminated and air is passed between the nonwoven fabric and the nonwoven fabric.
A filter for collecting dust in the air by using the non-woven fabric
Linear or strip-shaped conductivity on top and bottom of cloth
A filter provided with an electrode made of resin . 2. A filter according to claim 1, wherein the nonwoven fabric is laminated spirally.