JPS5864145A - Current supply apparatus of electrostatic type ultra-high capacity filter - Google Patents

Abstract

PURPOSE:To eliminate the temporary lowering of dust collection efficiency and the damage of a filter material, by connecting a high voltage power source apparatuses to each upstream side and each downstream side separators put in meandering filter materials through a conductive material having resistance preventing the movement of charge. CONSTITUTION:When a dust containing gas is sent into from the inlet of a vessel frame in such a condition that DC high voltage is applied to an ionizing wire 30 and a separator 15, dust particles 47 are charged by corona discharge and, in a process wherein the gas containing the charged particles 47 is passed through a dust collecting part, most of the charged particles 47 are adhered to the surface of each separator 15 in the upstream side and removed from said gas. Subsequently, the gas 48 containing the residual charged particles 47 is passed through a filter material 14 in the shortest distance and the charged particles 47 are deposited on the surface of the filter material 14 in a porous form. In the next stage, the charged particles 47 generated into the filter material 14 are moved along electric lines of force gathered to the fiber of the filter material by an electric field applied between separtors 15, 16 and, therefore, the area collected by the fiber is greatly increased.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a feeding device 11r for an electrostatic ultra-high performance filter to be used.

The filter is called HEPA filter. Generally f
Although it has high lklm efficiency. In addition, the pressure loss when passing dust-containing gas is also high. E
If you make the filter mesh coarser in an attempt to reduce F force loss. If S* efficiency decreases. The drawback is that the filter becomes large. In addition, the pressure loss due to clogging increases significantly. Another disadvantage was that the filter life was short. For this reason, a method has been adopted in which a suitable pre-filter is provided in front of the filter to extend the life of the filter.

The inventor of wood. As shown in Figure 1 and illustration Wg2, grounded parallel plate electrodes (2) are arranged and fixed in parallel in the dead direction on the mold plate (1) through which the gas containing gas passes, and the intervals between each IIF electrode (2) are fixed. A covered part (4) in which a discharge wire (3) for applying a sieving voltage is stretched, and a base frame (5) for passing the dust-containing gas passing through the load 111 part (4). Arrange the +11 material (6) in a meandering direction in the direction opposite to the direction. Conductive separators (also known as spacers) (7) that allow the passage of gas containing gas between adjacent portions of the filter medium are inserted from the upstream fAI+ and downstream sides of the air clamp, respectively.

High 11 juice between each separator on the upstream side and each separator on the downstream side? It consists of a dust collecting section (8) that applies an electric current to the load l.
The dust particles pre-charged in part i (4) are collected in part 11 (8). The dust collection efficiency is extremely high, with S* efficiency improved by 3 orders of magnitude compared to conventional collection efficiency using only filter media. Invented an electrostatic ultra-high performance filter with a long life.

In this electrostatic ultra-high performance filter. When power is supplied directly to each separator on the downstream side and each separator on the downstream side. Even if a discharge occurs in one part of a separator. The charge of all the separators is ptht,,,
Because the discharge energy b1 increases. The discharge causes the separator-liFF to temporarily drop. Dust collection efficiency may be temporarily reduced.

The present invention has the risk of damaging the filter material by creating holes in the material. Upper fi? The present invention aims to provide a power supply device for an electrostatic ultra-high performance filter that can solve the above problems.

The following figures 1 to 12 show 1 of the present invention!
To explain the example, in the third rivh to the first θ diagram, (9) is the base frame through which the dust-containing gas passes, and the left and right side walls tl
1, On, consists of top plate ttz and bottom plate 03. .

A filter medium made of glass fiber or the like is placed on one side inside the base frame (9). jr1llI to the other side pipe t1υ
It meandered through. And both upper and lower ends are provided so as to reach the inner surface of the top plate (12+) and the inner surface of the bottom plate a3 (151
．． 061 is a filter material (conductive separator sandwiched between adjacent parts of 141, respectively) that snakes from the upstream and downstream sides of the dust-containing gas passing through the mold crusher (9). Aluminum foil, etc. It is bent in a wave shape from the upper end to the lower end in order to intersect adjacent parts of the filter medium A4 so as to maintain a constant interval and to allow dust-containing gas to pass through the same interval. A is a surrounding wall protruding from the inner surface of the top plate 0 to filter medium 04) and a separator AS, (161 upper #1). 151, a surrounding wall that protrudes to surround the upper end of 0e. Pour the sealing material a9 into these surrounding walls (171, us and solidify it, filter medium α (a) and separator 〇5i. fl61
Both upper and lower surfaces of the holder are airtightly connected to the top plate 021 and the bottom plate a3. ■, +21) is between each Kamiura side separator cod and the surrounding wall side before sweating the sealing material αg. A conductive rubber sheet is inserted along the gap formed between each downstream separator block and the surrounding wall 0&, and is fixed by pouring sealing material (9) into each separator σ.
S, (Ie has an electric resistance that prevents the movement of charges, and as shown in the figure, the long and thin rubber sheet is used as the border at its center line, and is bent into a ■ shape. C)
Each separator 051 is biased so that one end of the separator 051 is always open.
゜(161) In the bent piece facing 161, a large number of incision lines (2 (A)) are inserted from the edge thereof to form thin pieces 9. Each thin piece (5) is an individual separator Q! 161 so as to be in contact with EF.■ indicates a wire mesh or other porous cover fitted to cover the entrance of the lid frame (9), @ indicates a Meikun cover■ and a filter medium I on the inside of the base frame (9). Grounded parallel plate electrodes are installed between the electrodes, and are arranged in parallel in the same direction as the dust-containing gas. These are cylindrical conductive spacers that provide electrical conduction, and are supported by core fixtures that are inserted through three locations at the top, middle, and bottom of each electrode tube.■
is an ionization line provided at each interval of each electrode cylinder, and a spring 6υ is installed between the top plate θ2 and the bottom plate α (between them).

gloss? It is strung through. C is a conductive rubber sheet (2
11 is a connection terminal for applying high WEE of the high EFIF stomach (b), and G is a high voltage power supply unit WIc to the ionization wire ω.
14) The connection terminal for applying high electrons, (to) is the ground terminal, and the conductive rubber sheet ■, 11
1 in common for extreme punishment? It is electrically connected to the tamed aluminum foil c37). (to) is the bottom of the left and right image side end surfaces of filter material 04) that has been overused! A sealing material is used to airtightly fit between the face and the left and right sides (all vH, 01!) of the lid frame (9).
1 (11, (If 111 is made of a material that may generate dust, such as wood, both left and right sides?Q (It
, 011 also acts as a seal to prevent the generation of powder from the inner surface of the juice side.

In the configuration of 1-kun e, the dust collection part formed by material a (!4) and each separator oq, a61 has a condenser formed between the upper separator 〇51 and the downstream separator 〇51, and a conductive rubber sheet. ■, (High tEF- is supplied through the front electric resistance of 2υ, and a slight leakage current flows through the filter medium α4, so the capacitance between each separator is CI, C2,... ,
Cs, conductive rubber sheet ■, a! The resistance of υ is R1e
R2..., Rs, resistance RJt of filter medium a4 *
When R72m..., R1%, the equivalent circuit of the above dust collecting section is as shown in Figure 7.

Now, if we show the equivalent circuit when power is connected to each of the separators as and ae without going through the conductive rubber sheets ■ and 1211, it will be as shown in Figure I'18. Even if each separator A5
1. The entire charge αe6' moves instantaneously to the discharge location, and the discharge energy increases. At that time, the discharge energy becomes voluminous.

This MW energy is separator〇s, a61+s
It is determined by the capacitance of n and the applied electrons, and is not affected by the externally connected resistor Rx.

However, as shown in Figure 147, separator = 19, (16
If power is supplied individually through the resistors R1 to R% of the conductive rubber sheets, even if a discharge occurs at one location on a certain separator, the amount of discharge will be limited by the resistors R1 to Rf&. Since the charges accumulated between the other separators do not move to the discharge point, the discharge energy is reduced to approximately one-third when the resistors R1 to Rs are not used.
In other words, it becomes.

For example, the external dimensions of the 4 frame (9) are 1 vertically and 6 horizontally.
10IIJ1. Depth 150111xt, '1i
According to experiments, when the voltage IKV, the filter material leak resistance is 200 MΩ, the filter material leak current is 5 μA per separator stage, and the capacitance 3 between separators is 3 x 10 F, the effect of limiting the amount of discharge is determined by the value of the resistance R%. Although it depends on the capacitance between the separators, it becomes apparent when it becomes more than IOKΩ,
The higher the resistance value, the smaller the charge transfer between the separators. However, if the value of the resistor Ra is made too large, a voltage drop will occur across the resistor R% due to leakage, and the voltage applied between the separator and the resistor will actually drop.

Collection efficiency will decrease. As a specific example, electric spindle 11
5% voltage drop when turning on voltage I KV? Assuming that the leak *i is allowed to be 5 μ per spacer stage as mentioned above, it is less than about 1 OMQ, so that the voltage drop at the resistor R can be ignored.

Therefore, in the case of the above example, the range of resistance Rs is 10Ω to I
It is appropriate to set it in the range of OMΩ.

Next, to explain the operation of the ultra-high-performance electric filter with the above configuration, in a state where a high DC voltage is applied to the ionization line and the separator 09, the main frame (9
), the dust particles are charged by corona discharge while passing through the charge IE part formed by the polar vinegar and the ionized wire, and the charged particles ? Each separator whose content is on the smooth side (
151, and each effect is more pronounced for charged particles with larger particle sizes. Next, the airflow of gas containing the remaining charged particles (2) passes through the filtering medium (141) in the shortest distance since the pressure loss of the filtering medium I is very large.Therefore, the airflow passes through the separator as shown in Figure 1O. 〇It is almost parallel to and opposite to the electric line of force that goes from Fg to α.At the same time, the electric force
! The speed of fH is filter medium α4? When passing through, the speed is extremely slow compared to the speed (surface wind speed) upstream of the dust collection section. In this way, when the direction of the electric field and the direction of the air flow are reversed.

The moving speed of the particle 4°9, i.e. the electric force lines -
Since the moving speed in the direction of Q41 becomes greater than the speed of the airflow passing through the filter medium 141, the charged particles cannot enter the inside of the filter medium Q41.On the other hand, since the airflow speed of the filter medium I is fast, the charged particles - is deposited in a porous manner on the surface of the spindle filter 1 (14).Next, the charged particles that are not deposited in a porous manner and enter the filter material (I41) are separated by the electric field applied between the sepabeater (151 and 061). Filter media 04
As the particles move along the lines of force that gather around the fibers, the area captured by the fibers increases dramatically.

Due to the above dust collection mechanism, the dust collection efficiency is significantly increased and clean gas is forced out from the outlet of the main frame (9). In addition, since charged particles with large particle diameters are more effectively collected by each separator (Is), there is less clogging inside the filter medium, and the life of the filter can be significantly extended.

In the above F embodiment, a conductive rubber sheet (1) in which a large number of thin sections (5) were provided on the conductive rubber sheet (1) and C+t+ was used.

Even if the separators on the downstream side (separators 〇〇 on the I or upper sliding side are inserted somewhat irregularly, the fine pieces of AM (c) will contact the individual separators, so there will be no damage to the docking area. It has the advantage that it does not occur.6
In the present invention, when each separator on the upstream side or each separator on the downstream side is accurately aligned and sandwiched,
It is possible to use a conductive rubber sheet simply bent into a V-shape without providing a thin section.

The present invention is not limited to the above-mentioned embodiments, but in the ninth embodiment, as shown in Figure U, a separator (1'3, Conductive seal with electrical resistance @14υ and insulating seal @
(4z is provided at 211, and each conductive separator a51 is sandwiched between the meandering filter medium I from the upstream side of the air flow. Its upper end is embedded in the conductive seal IIC (9), and the lower end is embedded in the insulating seal 1lI (4δ (2) Each conductive separator 〇e sandwiched from the downstream side of the airflow is embedded in a conductive seal (41) at its lower end and an insulating seal (111) at its upper end. so that each separator 09 on the upstream side is electrically connected to only one conductive seal, and each separator 09 on the downstream side (161
is made conductive only to the other conductive seal, and a negative or positive high voltage is applied to each downstream separator (161), and a positive or negative high voltage is applied to each downstream separator (161). It may also be configured as

In this case, liquid conductive sealing material 1 is poured into the a! edges of each separator 051 (161) and hardened.

Power can be supplied to *V without being affected by the shape of one edge of each separator (15) and Qe, and the reliability is high.

In addition, as shown in @12, a rubber sheet 33 is provided on the inner surface of the top plate α2 and the inner surface of the bottom plate 03 of the base frame (9) to provide electrical resistance to prevent the movement of charges of the separators as and he. (Foundation)
? The tangential middle piece T rubber sheet (43) formed at the upper end of each conductive separator A sandwiched from the upstream side of the air flow by the adhering and meandering filter medium A4 is elastically contacted.

Severe lower tightening (rubber seal the contact piece formed at the lower end of each conductive separator ae sandwiched from all) k4
) on each downstream separator (1
A negative or positive high voltage may be applied to the separator 51, and a positive or negative high voltage may be applied to each separator 061 on the downstream side. +4!19 in 1412 figure
, 14119 is the filter medium 041 and each separator (15
1. Both upper and lower FI# parts of C161? Top plate O2 and bottom plate α3
It is a sealing material that is airtightly bonded to the

In this case, since each contact piece and the conductive rubber sheet come into contact with each other with appropriate pressure, the reliability of the contact is high.

In the above embodiment, an example was shown in which the load 11 part and the collection part are provided in a base frame that is integrally molded. However, it is also possible to provide both parts in a base frame that is molded separately, and to combine their mold parts. Sometimes.

The present invention consists of all of the above-mentioned components, and the Takasho II is connected to each upstream separator and each downstream separator sandwiched in a meandering filter medium through a conductive material having an electrical resistance that prevents the movement of charges in each separator. source device can be connected,
When a discharge occurs at one location of a separator, the amount of discharge is increased by the electrical resistance, and it is possible to prevent all of the charges in the separator from moving to the discharge location.
Discharge energy can be kept small. Therefore, the separator voltage does not temporarily decrease due to discharge, and therefore the dust collection efficiency does not decrease temporarily. It also has the advantage that there is no risk of damage to the filter medium such as holes in the filter medium.

[Brief explanation of the drawing]

[! Figure L1 is a schematic perspective view of a conventional electrostatic ultrahigh performance filter, and Figure 2 is a circuit diagram of the same filter. @ Figure 3 is a partially omitted perspective view of the device of the present invention, Figure 4 is a perspective view showing an example of a conductive material, and l! Figure 5 is a vertical cross-sectional view of the device of the present invention with some parts omitted, Figure 6 is a cross-sectional view of the device of the present invention with some parts omitted, Figure 7 is an equivalent circuit diagram of the device of the present invention, and Figure 8 is a conventional diagram. Fig. 9 is a schematic diagram of the airflow of gas containing gas passing through the dust collecting section; Fig. 10 is a diagram explaining the relationship between the direction of P movement and the direction of the electric field when charged particles pass through the filter medium. , 1j! FIG. 11 is a diagram showing another embodiment of the present invention,
Figure 12 shows still another embodiment of the present invention. (9) Base frame, α(A) Filter medium, α9 Downstream conductive separator, 061 Downstream conductive separator, (21j, eυ Conductive rubber sheath),
c! ! 3... Thin section, (to)... Porous cover, @・
...Grounded parallel plate electrode, Ol...Ionization line, (G)
... Connection terminal, (B) ... High EE-power supply, (G) ... Connection terminal, (G) ... Earth terminal. Figure 1, Figure S, Figure 6

Claims (1)

[Scope of Claims] (1) A charging section that charges dust particles by corona discharge through the passage of dust-containing gas; A conductive separator that allows the passage of dust-containing gas is inserted between the adjacent parts of the filter media from the upper air stagnation part 1 and the upstream side, and each separator on the upstream side is placed in a meandering manner. In an electrostatic ultra-high performance filter consisting of a collecting part that applies a high voltage between each separator on the lower tN side
For each separator of rr11II and each separator on the upstream side. A conductive material having electrical resistance that prevents the movement of charges in each separator is distributed so as to be in contact with each other. A power supply for an electrostatic ultra-high performance filter is provided with a connection part for a high-voltage power supply on each of the conductive materials. (2) A conductive rubber sheet in which the conductive material has an electrical resistance that prevents the movement of charges in each separator) is bent in a V-shape, and a number of cut lines are inserted from one edge of one curved piece to form a number of An electrostatic ultra-high performance filter assembly device according to claim 1, which is provided with a finely chopped contact piece. (31) The conductive material is a liquid conductive sealing material having electrical resistance that prevents the movement of charges in each separator, and the end of the meandering filter media and the end of each upstream separator sandwiched between the filter media are connected to the wood. A point where the conductive seal poured into the hole in contact with the frame and solidified, and the conductive sealing material mentioned above, are in contact with the base frame at the end of the upper first filter medium and the end of each upstream separator sandwiched between the filter material. A power supply device for an electrostatic ultra-high performance filter according to claim 1, comprising a pair of conductive seals that are tightened and solidified. (4) A pair of y, s * seals that are A power supply device for an electrostatic ultra-high performance filter according to claim 3, which is provided on opposing tube surfaces of the separators. A conductive rubber sheet is sandwiched between meandering filter media, and a conductive sheet is provided so that the contact piece provided at the end of each upstream separator comes into elastic contact with the conductive rubber sheet, and the conductive rubber sheet side filter media is disposed on the conductive rubber sheet. The electrostatic conductor according to claim A1, paragraph 1, comprising a pair of conductive sheets provided so that the contact pieces provided on the gauge of each downstream separator sandwiched between the materials are elastically glued. Power supply device for electric ultra-high performance filter. (6) Supply WVl of static-type high-performance filter with structure 5 P1#, in which a pair of conductive sheets are respectively provided on opposing walls of mold crusher. tsu.