JPH0622445Y2 - Charge type filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a charge type filter, and more specifically, it forms an electric field by charging between a high-voltage electrode and a ground electrode or between an anode and a cathode to prevent dust and materials. The present invention relates to a charge-type filter which can be used in various fields of air cleaning and which has high performance and high performance due to electrostatic and / or dielectric action by charging and.

[Prior Art] Conventionally, a filter of a type that collects dust by charging is charged by passing dust through an electric field formed between a high-voltage electrode and a ground electrode, and the dust is charged by the ground electrode. To collect or coarsen the particles, and to collect dust that is not collected by the ground electrode or dust that is collected by the ground electrode and then re-scattered mechanically using a material or the like.
-37060 type, and in addition to the dust charging section, a material made of a dielectric material is further installed between the high-voltage electrode and the ground electrode to form an electric field, and the material is made to be a dielectric so that dust can be machined. Statically and electrostatically, for example, JP-A-58-92471
There is a system shown in No. etc., and the former is generally known as an electrostatic precipitator with material and the latter is known as a dielectric filter device.

The former method has a drawback that it is inferior in dust collection efficiency, and in addition, it requires frequent cleaning of the ground electrode and replacement of the material, which is also inferior in maintainability.On the other hand, the latter method has a drawback. Although it has better collection efficiency than the former, it has a drawback that the material is heavily clogged because it collects dust with high efficiency, the collection capacity is small and the life of the material is short, and that a thin material is used. There was a drawback that there was a risk of short circuit.

[Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned drawbacks of the prior art, and provides a charge-type filter having excellent collection efficiency, long material life, and no risk of short circuit. With the goal.

[Means for Solving the Problems] According to the present invention, comb-shaped electrodes are installed on the inflow side and the outflow side of a fold-folded material so that teeth are inserted in the valleys of the material. Further, the present invention relates to a charge-type filter characterized in that the comb-shaped electrodes on the inflow side of the air flow and the comb-shaped electrodes on the outflow side of the air flow are alternately arranged in the folding line direction of the folds of the material.

[Operation] That is, in the charge-type filter of the present invention, the comb-shaped electrodes on the inflow side and the outflow side of the air flow are installed close to or in contact with the material so as to match the fold shape of the material. Since the comb-shaped electrodes on the inflow side and the outflow side of the air flow are alternately formed in a direction perpendicular to the air flow direction, that is, in the folding line direction of the folds of the material, the electrodes are respectively anode and cathode, or high voltage electrode and ground electrode. When it is charged, it will not clog easily,
The dust collection capacity also increases. The reason for this is not clear, but when the anode and cathode, or the high-voltage electrode and the ground electrode are alternately arranged, a strong gradient force (a force caused by the electric field gradient) is generated by the unequal electric field, and dust is trapped in the filter. Since it is unevenly distributed and adheres to the filter, dust accumulates in the filter with a path for the air flow containing dust being secured, which increases the time until clogging and collects much dust. I think it will be possible.

Further, with such an arrangement, compared with the case where the electrodes on the inflow side and the outflow side of the air flow are arranged on the same plane, or when a continuous planar electrode is used, the anode and the cathode, or the high-voltage electrode Since the distance to the ground electrode can be increased, a short circuit is unlikely to occur even if a thinner material is used.

Furthermore, if the comb-shaped electrodes of the respective poles are connected by a conductive member such as a frame made of a conductive material, the filter can be assembled and the materials can be replaced very easily.

[Embodiment] The present invention will be described below based on an embodiment with reference to the drawings.

First, the material 1 used in the present invention will be described.
As the material 1, all well-known air-conditioning materials that can be folded can be used. These materials 1 are materials made of paper, non-woven fabric, or inorganic fiber such as glass fiber, and have a low apparent density for coarse dust to a HEPA filter for ultra-high performance. You can use anything up to the high density one called. However, in the present invention, since a high voltage is usually used, it is necessary to use an insulating material. It is also preferable to make the material flame-retardant in case of an emergency.

In particular, a non-woven fabric containing at least 50% or more of synthetic fibers such as polyester and polypropylene serves as a dielectric filter when charged, so that the dust collection efficiency is also high and it is considered to be optimal. Further, providing the material with a density gradient can also be effectively utilized in the present invention in the conventional manner.

The material 1 is fold-folded at a predetermined pitch according to the application, and is stored in a casing or the like having an inflow and an outflow of airflow.

Next, the comb-shaped electrode 2 will be described.
As shown in FIGS. 4 (a) to 4 (c), comb-shaped electrodes in which teeth in a mountain shape, a line shape, or the like are arranged at a predetermined pitch are used. As the material for the electrodes, metals such as stainless steel, silver, copper, aluminum, nickel, and iron, those with a plastic coating on the surface of these metals to prevent rust and short circuits, paper, plastic, etc. It is suitable to wrap a metal foil of aluminum or the like, or to have metal evaporated. Processing such as molding, die-cutting, cutting, bending, and joining is appropriately selected and applied to these materials to form comb-shaped electrodes. Generally, the electrode of FIG. 4 (a) is obtained by die-cutting or cutting a plate-shaped material, and the electrode of FIG. 4 (b) is obtained by bending a metal wire or the like.

It is desirable that the pitch of the teeth of the comb-shaped electrode 2 be synchronized with the pitch of the folds of the material 1, so that the teeth of the comb-shaped electrodes are inserted corresponding to the troughs of the foldd material. Become. As shown in FIG. 2, it is particularly desirable that the fold shape of the material 1 and the shape of the teeth of the comb-shaped electrode 2 are the same or similar. By doing so, the material 1 and the electrode 2 are almost the same. Since they can be arranged equidistantly or in contact with each other, an effective charging effect can be uniformly obtained over the entire area of the material. Here, the trough of the material 1 refers to a deep portion of the folded material, that is, a concave portion when viewed from the insertion direction of each comb-shaped electrode.

Further, the comb-shaped electrode 2a on the air flow inflow side and the comb-shaped electrode 2b on the air flow outflow side must be arranged alternately when viewed in the folding line direction of the folds of the material as shown in FIG. This is because if the electrodes 2a and 2b are in the same plane, the electrodes are too close to each other, increasing the risk of short circuit.
On the other hand, if two or more electrodes on the same side continue, a sufficient electric field effect cannot be obtained during this period. Electrode 2a,
If the 2 b's are alternately arranged in this way, the distance between the electrodes can be increased, so that the electric field forming region can be expanded to obtain a uniform dust collecting action, and a short circuit between the electrodes can be prevented. it can. Also, by arranging them alternately as described above, a strong grading force is generated by the unequal electric field, and the dust is unevenly distributed inside the filter and adheres, and the path through which the air flow containing dust passes is secured. Since it is estimated that the dust accumulates in the filter, the time until clogging becomes long and a lot of dust can be collected.

As shown in FIG. 1, the comb-shaped electrode 2 is preferably integrated by connecting the ends with the conductive frame 3 at each pole. Not only is it easier to perform, but maintenance such as material replacement can be done very easily. Further, as shown in FIG. 5, in order to fix the insertion angle of the comb electrode 2 and the position of the electrode, the comb electrode 2 may be connected by a non-conductive wire 6 such as a plastic wire. In this case, the non-conductive wire is used in particular, because if it is a conductive wire, it becomes a part of the electrode, and the electrode is continuous in the folding line direction of the folds of the material, so that a short circuit easily occurs, This is because the effect of the present invention cannot be obtained by arranging the electrodes alternately.

One of the comb-shaped electrode 2a on the air flow inflow side and the comb-shaped electrode 2b on the air flow outflow side with the material 1 sandwiched therebetween is connected to the ground 4 and the other is connected to the high-voltage power supply 5, thereby forming a ground electrode and a high-voltage electrode, or a power supply. By connecting to the positive and negative electrodes, respectively, an anode and a cathode are formed, and a charge-type filter is constructed.

The distance between the electrodes 2a and 2b may be arbitrary, but 2 to 50 mm is considered appropriate in order to prevent short circuit and obtain a good electric field. With respect to the above, it is desirable that the distance is 0.2 to 1.0 kv / mm (distance between electrodes), and preferably 0.5 to 0.9 kv / mm.

In the above electrode formation, it is particularly preferable that the comb-shaped electrode 2a on the airflow inflow side is a ground electrode and the comb-shaped electrode 2b on the airflow outflow side is a high-voltage electrode. If you do this,
This is because the speed of dust passing through the material is reduced by the electric field effect and / or the dielectric effect of the material, so that the dust collection efficiency is improved. The excessive action of the charge type filter in this case will be described below.

In the charged filter of FIG. 1, an air stream containing dust flows from the surface of the ground electrode side to the high voltage electrode side in the material, and conversely, an electric field is formed from the high voltage electrode to the ground electrode. The dust that has passed through the ground electrode is charged in the material and receives an electric attraction force to the ground electrode, which is opposite to the flow of the air flow. Therefore, the dust that has reached the material is decelerated by the influence of the ventilation resistance and electric field of the material and / or the dielectric action of the material, so that it is efficiently collected by the material. At this time, since the dusts are charged to the same polarity, the dusts do not agglomerate densely and are collected as if they were brushed, so the dusts are clogged even if they accumulate. There is no such thing. Also, the force that dust is released from the material due to electrification is obviously smaller than the flow velocity of the air flow,
No dust is released from the material surface. Furthermore, since the high-voltage electrode and the ground electrode are arranged so as to alternate in the folding line direction of the material, the distribution of the electric field spreads in the surface direction of the material, and when the electrodes face each other, Since an unequal electric field that is not in a specific region is formed as described above, it is considered to be advantageous for improving the dust holding capacity.

As a result, dust is retained on the material for a while, but since all the dust does not aggregate densely due to the action of the electric field, clogging is less likely to occur and the pressure loss rises compared to conventional charged filters. Far less.

Further, normally, excessive accumulation of charged dust particles may cause dust to be released due to the repulsion action between the dust and lower collection efficiency, but in this example, the ground electrode is arranged on the air flow inflow side. Since they are always grounded by the ground electrode, these obstacles due to charge accumulation do not occur.

[Advantage of Invention] As described above, the charge-type filter according to the present invention is
The comb-shaped electrodes are arranged so as to match the fold shape of the material, and the comb-shaped electrodes on the inflow side of the air flow and the comb-shaped electrodes on the outflow side of the air flow are alternately arranged in the folding line direction of the folds of the material. The storage capacity is far superior to conventional ones. This not only reduces the number of times the charge type filter needs to be replaced, but also enables extremely long-term use by performing dust removal work of a conventional level. Therefore, the maintenance and cost associated with the replacement of the charge type filter are reduced, and the cost is very excellent.

In addition, the charge-type filter of the present invention has the above configuration,
Since the distance between the electrodes can be made large in a narrow space, the electric field forming region can be expanded to obtain a uniform dust collecting action, and a short circuit is unlikely to occur even if a thin material is used.

Furthermore, since the charge type filter of the present invention has a much lower increase in pressure loss than conventional ones, it can be used as an air cleaner for internal combustion engines, etc., so that intake efficiency or combustion efficiency is improved, which improves fuel efficiency and output. When used in the general field of air cleaning, it also enables the use of higher density materials and the treatment of a larger amount of airflow, providing an air cleaning device with a high performance and compact structure. can do.

Therefore, the charge-type filter of the present invention not only has a good dust collection efficiency, which is its original function, but also has a high dust holding capacity and a long service life, is economical, has excellent productivity, and has a wide range of applications. It is an ideal charge type filter.

[Brief description of drawings]

FIG. 1 is a perspective view in which an electrode portion and a material portion of a charge type filter of the present invention are separately drawn, and FIG. 2 is a horizontal cross-sectional schematic view showing a positional relationship between a comb-shaped electrode and a material in the charge type filter,
FIG. 3 is a schematic vertical cross-sectional view showing the positional relationship between the comb-shaped electrodes in the charge type filter, FIG. 4 is an example of the comb-shaped electrodes used in the present invention, and FIG. 5 is a comb-shaped electrode connected by a non-conductive wire. FIG. 4 is a perspective view showing a reinforced electrode portion. The numbers in the figure are: 1 ... Material 2 ... Comb-shaped electrode 2a ... Comb-shaped electrode on airflow inflow side 2b ... Comb-shaped electrode on airflow outflow side 3 ... Conductive frame 4 ... Ground 5 ... High-voltage power supply 6 ...... Non-conductive wire

Claims (3)

[Scope of utility model registration request] 1. A comb-shaped electrode is installed on each of an inflow side and an outflow side of an air flow of a fold-folded material so that teeth are inserted into a valley portion of the material, and an inflow side of the air flow. The comb type electrode and the comb type electrode on the outflow side of the air flow are alternately arranged in the fold line direction of the folds of the material. 2. The charge-type filter according to claim 1, wherein the comb-shaped electrode on the air flow inflow side is a ground electrode, and the comb-shaped electrode on the air flow outflow side is a high-voltage electrode. 3. The charge-type filter according to claim 1, wherein the comb-shaped electrodes of the respective poles are integrated by connecting end portions thereof with a conductive member.