JPH0377656A - Air cleaner - Google Patents

Abstract

PURPOSE:To improve the dust collecting efficiency and to prolong the life of filter by disposing a discharge part consisting of 1st discharge lines and metallic nets in the upstream side of air flow, and eletret filters in the downstream side in wave form, and arranging 2nd discharge lines in farther downstream side. CONSTITUTION:The discharge part 1 provided in the upstream side of air flow consists of the metallic nets 2 disposed in wave form, the 1st high potential discharge lines 3 provided in the recessed parts of the nets, and high potential electric power source 4. The dust collecting part 5 provided in the downstream side of air flow consists of electret filters 6 disposed in wave form, 2nd high potential discharge lines 7 provided in the recessed parts of the filters, and high potential electric power source 8 impressing high potential to the discharge lines. Thus, by reducing the wind velocity passing through the filters 6 to improve the dust collecting efficiency, and by dielectrically polarizing the filter 6 having lost the dielectric force with the 2nd discharge lines to give them dielectric force, the life of the filters is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air cleaning device for collecting dust particles in the air.

Conventional technology The configuration of the conventional example will be explained below with reference to FIG.

For air purification, electret filters are sometimes used to collect dust particles. For example, JP-A-57-1
As shown in Japanese Patent No. 5856, a proposal has been made to charge dust particles in the air and collect the dust particles using the electrostatic force of an electret filter. 101 is an outer frame of the air purifier body, j5, 102 is a charging section, and 1o3 is an electric left filter. The charging section 102 is a discharge wire 104
and a parallel plate electrode fM1oei, and the positive terminal is connected to the discharge wire 104 from the DC high voltage power supply 106 between the discharge wire 104 and the parallel plate electrode 105, and the negative terminal is connected to the parallel plate electrode [10S].

With the above configuration, when an air flow containing dust particles flows into the charging unit 102 from a blower or the like, the glass is applied to the discharge wire 104 and a negative DC high voltage is applied to the parallel plate electrode 105. A positive corona discharge is generated between the parallel plate electrode 104 and the parallel plate electrode 105, and the inflowing dust particles are positively charged by the corona discharge. These positively charged dust particles were attracted to the negative side of the polarizer of the electret filter furnace material by electrostatic force and were collected.

Problems to be Solved by the Invention Under such a conventional configuration, the electret filter 1
03 has a flat shape, so the area of the furnace material is small, and in order to ensure air volume, an electret filter 103 is used.
Therefore, there was a problem that the dust particle collection efficiency was poor.

In addition, when collecting charged dust particles, since the particles are positively charged, it is carried out by the negative Coulomb force of the furnace material of the electret filter 103, so when charged particles adhere, the charge of the furnace material and the dust particles are The charges are electrically neutralized, the electrostatic force of the electret filter 103 is weakened, and the collection efficiency decreases over time.

In other words, for low pressure loss specifications with a small density and a sufficient air volume, the initial dust collection efficiency is low, and as dust accumulates, the dust collection efficiency decreases significantly over time, resulting in a short service life. The problem was that it was short.

Therefore, in an air purifier using the electret filter 103 as a furnace material, the pressure loss is small, the initial collection efficiency of dust particles is good, the electrostatic force of the electret filter 103 is maintained, and the dust collection over time is reduced. The challenge is to suppress the decline in efficiency and extend the lifespan.

In view of the above problems, the present invention reduces pressure loss and improves initial dust collection efficiency, and provides an electret filter 10.
Electret filter 103 that maintains the electrostatic force of 3 and prevents the decline in dust collection efficiency over time, extending the life of the button.
The present invention provides an air cleaning device that has a long replacement period.

Means for Solving the Problems A discharge section consisting of a first discharge wire and a metal net is arranged on the upstream side of the air flow, and an electret filter is provided on the downstream side. electret filter, and a second discharge wire is arranged downstream of the electret filter.

Function: The present invention has the above-described configuration, increases the effective area of the electret filter, lowers the wind speed passing through the electret filter, reduces pressure loss, increases collection efficiency, and applies voltage to the second discharge wire. In particular, the electret filter, which has collected dust and lost its electrostatic force, is dielectrically polarized, making it possible to further collect charged dust particles by the electrostatic force, thereby extending the life of the electret filter.

EXAMPLE An example of the present invention will be described below with reference to FIG.

FIG. 1 is a schematic cross-sectional view showing the air cleaning device of the present invention.

In FIG. 1, reference numeral 1 denotes a discharge section provided on the upstream side of the airflow; a metal net 2 installed in a single wave shape; a first high-voltage discharge wire 3 installed in a recessed portion of the metal net 2; The high-voltage power supply 4 that applies high voltage to the high-voltage discharge line 3 is cautioned. Reference numeral 6 denotes a dust collection section provided on the downstream side of the airflow; an electret filter 6 provided in a wave shape; a second high voltage discharge line T provided in the recess of the electret filter 6; and a third high voltage discharge line. The high-voltage power supply 8 that applies high voltage to the power supply 7 is prohibited. Further, 10 is a blur filter provided on the upstream side of the airflow of the discharge section 1.

The air cleaning device configured as described above will be explained using FIGS. 1 to 3.

First, turn on the operation switch of the air purifier.

High voltage discharge # by high voltage power supply 4! A high voltage is applied to the metal net 3, and a discharge current flows from the high voltage discharge l1A3 to the metal net 2, forming an ionized region. A blower device (not shown) included in the device draws suspended particles in the air into the air purifying device, and first coarse particles 10 such as cotton bolls υ with large particle diameters are removed. Prefilter-9
The sand is removed by sand removal. When the fine particles 11 that have passed through the blur filter 9 pass through the above-mentioned ionization region, they are sibulously charged due to repeated collision ionization of electrons and ions released into the ionization region and diffusion of ions, and become charged particles (not shown). ).

When charged particles (not shown) approach the electret filter 6 arranged in a wave shape, the charged particles (not shown) are attracted and collected by the negative side of the dipole polarizer of the electret filter 6 by electrostatic force. Ru.

When charged particles (not shown) adhere to the electret filter e, the negative charge of the filter furnace material is electrically neutralized by the positive charge of the charged particles (not shown), but the downstream of the electret filter 6 The second one on the side
When a voltage is applied to the high voltage discharge line 7 of the electret filter 6, an electric field is generated between it and the metal net 2 provided on the upstream side of the electret filter 6, which collects dust particles and loses its electrostatic force.The electret filter 6 is dielectrically polarized and collects the charged particles. (not shown) can be further collected by electrostatic force.

From the above process, since the electret filter 6 is arranged in a wave shape, the area of the furnace material is larger than in the case of a flat shape, and the charged particles (not shown) when passing through the electret filter 6 are The passing speed becomes smaller. Therefore, it takes a long time for charged particles (not shown) to pass through the electret filter 6, and the collection efficiency increases because the number of charged particles (not shown) that are collected by electrostatic force and mechanical force increases. will improve. Furthermore, the pressure loss caused by the electret filter 6 is reduced by reducing the passage speed of charged particles (not shown).

Further, the electret filter 6 loses its electrostatic force by collecting charged particles (not shown), but by dielectrically polarizing the electret filter 6, it is also possible to further collect charged particles (not shown) by electrostatic force. This has the effect of extending the life of the electret filter 6.

Furthermore, since the metal net 2 serves both of the roles of charging the fine particles 11 and dielectric polarizing the electret filter 6, there is also the effect that the air cleaning device can be made thinner.

Effects of the Invention As described above, the present invention includes a discharge section consisting of a first discharge wire and a metal net arranged on the upstream side with respect to the air flow, and an electret filter on the downstream side. The following effects can be obtained from an air purifier in which the discharge wires are arranged tightly and in a wave shape, and the second discharge wire is arranged downstream of the electret filter.

(1) The electret filter increases the area of the furnace material arranged in a wave shape. As a result, the speed at which dust particles pass through the electret filter is reduced for the same air volume, so that the dust particle collection efficiency of the electret filter is improved and pressure loss is reduced.

(Smell) The electret filter, which has lost its electrostatic force due to the collection of charged particles, is dielectrically polarized, and the electret filter, which has lost its electrostatic force, is dielectrically polarized, and the charged particles can be further collected by the electrostatic force, thus extending the life of the filter. can be extended.

(3) Since the metal net serves both to charge the fine particles and to dielectrically polarize the electret filter 6, it has the effect of making the air purifying device thinner.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an air purifier according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional air cleaner.

Claims (1)

[Claims] A discharge section consisting of a first discharge wire and a metal net arranged from the upstream side with respect to the air flow, an electret filter, and a third discharge wire are provided in this order, and the electret filter has a wave shape and extends across the air passage. An air purifying device characterized in that the second discharge wire is arranged downstream of the electret filter.