JPS58156323A - Filtering type dust collector - Google Patents

Abstract

PURPOSE:To provide a dust collector capable of easily carrying out regeneration of a filter, constituted so as to separately collect mist and fume by using two kinds of different filters. CONSTITUTION:When dust having mist and fume mixed therein introduced from a gas inflow port 1 is introduced into a primary filter 3, oil mist with a coarse particle size is selectively collected. In order to shake off the collected oil mist, a washing liquid supplied from a washing liquid storage tank 5 through a dust separator 6 by a pump 7 is sprayed from a spray nozzle 4 to wash the filter 3. Welding fume passing the primary filter 3 is introduced into a charging apparatus 8 constituted from a discharge electrode 81 and an earth electrode 82 and, while charged by corona discharge generated by applying high voltage between both electrodes, introduced into a secondary filter 9. By electrostatic attraction force acted between charged fume and the filter, high dust collecting efficiency can be obtained with low gas passing loss.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust filter that separates and collects liquid mist and solid dust mixed and suspended in gas.

When welding steel materials coated with anti-corrosion oil or processing oil, a liquid mist is produced when the oil vaporizes due to high heat, as well as solid particles of fume.

If this dust is collected using a conventional dry type filtration machine, the mist will be collected along with the fume, which will cause the filter to become clogged more quickly. It becomes difficult. However,
With the conventional filtration system, the filters have to be replaced more frequently, resulting in problems such as poor maintenance and high running costs. To collect such sticky powder, a wet cleaning method is generally used to remove the dust collected by the filter. However, in order to collect extremely fine particles such as welding fume with an average particle diameter of 0.2 μm, a high-performance filter with extremely small openings is required. 9, the ventilation loss of the filter increases rapidly,
The problem arose that it was difficult to use.

As mentioned above, even in the conventional dry or wet filtration method, there are drawbacks to the method for collecting dust from welding fumes containing oil mistakes, and an effective dust collection method is desired.

An object of the present invention is to provide a dust collector in which mist and fume are separately collected using two different filters, and the filters can be easily regenerated.

The present invention focuses on the difference in particle size between mist and fume, and collects only part of the coarse mist with a filter, and collects it with a secondary filter by applying an electric charge to the thin fume that has passed through the -order filter. The purpose of the present invention is to provide a filtration and dusting machine in which the secondary filter is cleaned with a cleaning liquid and the secondary filter is shaken off by vibration to eliminate mold.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration diagram of an embodiment of the law enforcement agency according to the present invention. 1 is a gas inflow hole, 2 is a gas outflow hole, 3 is a preparation filter, 9 is a secondary filter, and the -order filter 3
In the waste flow path between the secondary filter 9 and the
When the fan 11 is started, the dust mixed with mist and fumes is introduced into the gas inflow hole 1 and is first passed through the next filter 3.
Introduced in the.

The second filter 3 has a structure in which non-woven raised edges are arranged parallel to the direction of gas flow force and has sufficient air permeability. Oil is produced (welding fume (solid) and oil mist (liquid) generated as the base metal comes into contact with the bath).
The particle size was determined by the Ministry of Invention and others using a dust monitor, and found that the average particle size of oil mist was 1.2 μm, while that of welding fume was 0.2 μm, which was 6111 times.
Ta. Such dust etc. is introduced into the -F filter 3'dB.
As a result, oil mist with coarse particle diameters is selectively collected. -The gas flow rate passing through the filter 3 is 3 to 5111
/S and the normal filter dust number clT'+/S, the flow velocity is southerly, so the collector ellipse in the -order filter 3 is dominated by the inertial gap on the nap fibers. . Fine particles of 0.2 .mu.ri., such as welding fumes, are hardly affected by the inertial force, so they are not collected by the -order filter 3. However, if the filter is operated for a long period of time, solid fumes will also accumulate on the -order filter 3, resulting in an increase in ventilation loss. Therefore, a washing machine 1fl is provided in order to remove the fumes trapped in the -order filter 3. The cleaning method uses the cleaning liquid storage tank 5.
Then, the filter 3 is sprayed with a cleaning liquid from the sedge spray nozzle 4 by the pump 7 through the tasto separator 6 for cleaning.The cleaning liquid may be aqueous or oil-based. The major difference between the conventional wet cleaning method and the cleaning method of the present invention is the method of collecting dust with a filter. In other words, in the conventional method, the purpose of the filter is to collect dust, etc. (including 9 g of t1iU bodies), but in the present invention, since solid particles are not collected as much as possible, the stagnation of the cleaning solution is extremely high. The reason is that it requires little effort to replace or regenerate the cleaning solution.

- The oil mist and some of the welding fumes collected by the next filter 3 are stored in the cleaning liquid oil storage tank 5.
When it reaches a certain concentration, drain it out of the thread and replace it with new cleaning solution. The welding fume that has passed through the -order filter 3 is
A load consisting of a discharge electrode 81 and a ground electrode 82 is introduced into the device 8 . 83 generates DC commercial voltage! a, discharge electrode 81
When a high voltage is applied between V and the ground electrode 82, corona discharge occurs. When the welding fume passes through this corona discharge field, the welding fume is exposed to a high concentration of ions. Since the time for passing through the charging jet 18 is very short, several IQms, the charging device 8 hardly collects the fume. Passes through charging device 8 and is then charged -g
The nyc hum is introduced into a secondary filter 9. Secondary filter 9ii is a bag filter made of nylon or Tetron, and the filtration speed is several cm/s. The mechanism of the charged fume in a bag filter is that the collecting force is promoted by the electrostatic attraction force that acts between the charged fume and the filter, in addition to the collecting action such as mechanical diffusion or collision. It is possible to obtain high commercial efficiency with low ventilation loss.

The bath fluid collected by the secondary filter 9 may be vibrated or scraped off. ! A: It can be easily brushed off by a powerful method. The dispelled hume is stored in the tast box 10 and then discharged out of the system.

As mentioned above, welding fume containing oil mist generated when welding base metals coated with anti-corrosion oil, cutting oil, etc. is removed from the -order filter, charging device, and secondary filter.
111, it is possible to collect one filtration of mist or fume with a high rate of 9JJ, and also to easily shake off the collected mist and fume. The purpose of this invention is to provide a filtration dust machine with excellent collection and maintainability.

[Brief explanation of the drawing]

FIG.

Claims (1)

[Claims] 1. A preparation filter that has a gas inflow hole and an outflow hole and that collects coarse particles from the dust introduced through the inflow hole, and a cleaning mechanism that washes the secondary filter; 1. A filtration dust machine comprising: a charging device that applies electricity to the dust that has passed through the charging device; and a secondary filter that collects the dust charged by the charging device.