JP3137601B2 - Dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting apparatus for collecting fume dust generated during an arc welding operation and fine dust generated during a stone polishing operation and a ceramic raw material manufacturing operation.

[0002]

2. Description of the Related Art A dust collecting device configured to collect fine dust generated by using a blower such as a large air flow type turbo fan or a plate fan by combining elements of various materials and a suction function by static electricity is provided. It has been used for some time. Fume dust generated during arc welding is 1 to 0.0
It is very fine dust having a size of 1 μm, and it is very difficult to collect it with a dust collector. For example, according to an experiment conducted by the present inventor using a conventional dust collector, the collection efficiency of a dust collector having a structure using a turbo fan by combining an element having a mesh of 0.3 μm and an adsorption function by static electricity is 99.50%. (Cleanness 2.0mg / m ³ ,
However, the collection efficiency of a dust collector with a structure using a fume dust generation amount of 400 mg / m ³ and an air amount of 20 m ³ / min and a mesh of 0.1 μm and a turbo fan during a manual arc welding operation is 99.70% ( Cleanliness 1.
2 mg / m ³ , provided that the amount of fume dust generated during manual arc welding work is 400 mg / m ³ and the amount of air is 20 m ³ / min)
Met. The weight of the fume dust was about 1 g in terms of one arc welding rod.

[0003]

The fume dust generated during the arc welding operation and the fine dust generated during the stone polishing operation and the ceramic raw material manufacturing operation are considered to be harmful to the human body, and the worker sucks it in for a long period of time. This can be a factor in pneumoconiosis. For this reason, it can be said that the performance of the equipment for preventing the worker from inhaling such fine dust as much as possible is also important from the viewpoint of the working environment.
However, in the above-mentioned conventional dust collector, it is difficult to secure a collection efficiency of 99.9%, which is generally regarded as a safe level, and it is difficult to realize a dust collector that achieves high collection efficiency. Had been requested.

[0004] An object of the present invention is to collect fine dust such as fume dust with a high recovery efficiency of 99.9% or more, and furthermore, to remove dust adhering to each filter by a backflow air action by a reverse operation of a positive displacement blower. It is an object of the present invention to propose a dust collecting device capable of easily removing and collecting dust.

[0005]

According to the first aspect of the present invention, there is provided a collection unit for collecting fine dust, and a filter filled with a solid piece, which is a crushed material of a PET bottle. First screen and mesh 0.1-0.5
A second screen provided with a filter having a surface coated with Teflon using a non-woven fabric of μm, and a third screen provided with a filter wound with hollow fibers having a pore diameter of 0.1 μm.
Screens, the screens are connected in series, and the exhaust port of the third screen is connected to the suction side of a positive displacement blower capable of switching between forward and reverse operation. The fine dust is collected from the collecting part, and the filter is washed by discharging the outside air into the screen during the reverse operation, and the take-out part for collecting the fine dust settled by the washing is provided for each screen. It is characterized by being provided on the bottom.

In order to achieve the same object, the invention according to claim 2 provides a first part provided with a collecting part for collecting fine dust and a filter filled with solid pieces as pulverized material of a PET bottle.
Equipped with a screen and a second screen provided with a Teflon-coated filter on the surface using a non-woven fabric having a mesh of 0.1 to 0.5 μm. The discharge port of the second screen is connected to the suction side of a large displacement blower, and the fine dust is collected from the collection unit during the normal rotation operation of the same volume blower, and the outside air enters the screen during the reverse rotation operation. Each filter is washed by discharging it, and a take-out part for collecting fine dust settled by the washing is provided at the bottom of each screen.

According to a third aspect of the present invention, there is provided a portable dust collecting apparatus as set forth in the first or second aspect, wherein the dust collecting apparatus is mounted on a base with casters. It is characterized by being configured to be movable.

[0008]

The fine dust such as fume dust generated during the arc welding operation is sucked together with the surrounding air from the collecting part by the negative pressure action by the forward rotation operation of the positive displacement blower and collected. . Fine dust is gradually captured by the screens arranged in two or three stages, and the clean air is discharged to the atmosphere side from the discharge port of the positive displacement blower. If dust adheres to the filter and causes clogging, the outside air is discharged into each screen by the backwash function by the reverse operation of the positive displacement blower, which removes the dust from the filter and removes the settled fine dust. It can be collected from the take-out part.

Since the portable dust collecting device having the dust collecting device according to claim 1 or 2 installed on a frame with casters can be moved to an arbitrary place, the generation of fine dust such as fume dust is small. Ideal for use in small or small spaces.

According to the dust collecting apparatus of the present invention, fine dust such as fume dust can be collected with a high collection efficiency of 99.9% or more. In addition, dust adhering to each filter can be easily removed by the backflow air action due to the reverse operation of the positive displacement blower, and sedimented fine dust can be collected from the take-out part, maintaining stable dust collection performance for a long time can do. Further, in the case of a portable dust collecting device, there is an advantage that the device is easy to use because it can be moved to an arbitrary place.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a schematic configuration of a dust collector, FIG. 2 is a front view showing a part of the portable dust collector cut away, and FIG. 3 is a side view showing a part of the dust collector cut away. .

The schematic structure of the dust collecting apparatus A shown in FIG. 1 is composed of a collecting section 10 for collecting fine dust such as fume dust, and a first collecting section 10 for collecting fine dust.
The screen 20, the second screen 40, and the third screen 50 are arranged in series, and include a roots blower 60 capable of performing a forward / reverse switching operation. Here, a roots blower is selected and described as a positive displacement blower, but a twin screw blower, a single shaft rotary blower, or the like can also be used. Collection section 1
Numeral 0 has a large hood shape with the lower part opened, and a collection port 11 for collecting fume is provided at the top. Reference numeral 12 denotes a sub-collection portion provided on a branch pipe 1a branched from the flexible hose 1 described later.

The first screen 20 is provided with a suction chamber 22 and a filter chamber 23 by dividing the internal space of the box 21 by a mesh-like partition 21a. 5 to 1 made of crushed material such as polyethylene resin plastic bottles or other plastic materials
A thin solid piece having a size of about 0 mm packed in a synthetic fiber woven bag is used as a filter 24, and the filter chamber 23 is filled with the filter 24. 25 is a bolt 26
This is the upper lid that is tightened and attached. The inventor washed a recycled PET bottle, and appropriately pulverized the PET bottle to use as a solid piece.

The crushed pieces of the PET bottle are filled so that the vacuum resistance of the air passing through the filter chamber 23 is about -100 to -500 mmAq.
The air flow passage is a minute gap, and in addition, the crushed pieces of PET bottles are generally liable to generate static electricity, so that it is considered that fume dust adheres well. According to the operation test of the dust collector A, it was recognized that the crushed pieces of the white PET bottle turned light brown after using several tens of welding rods by manual welding. It was confirmed by chemical analysis that it was fume.

On the suction port 22a side of the suction chamber 22, there is provided an introduction pipe 27 containing a butterfly check valve 28, and a well-known sputter trap 29 is mounted on the suction side of the check valve 28. 27 and the collection port 11 of the collection unit 10 are connected by the flexible hose 1 (or piping).
The check valve 28 is provided to close the passage of the introduction pipe 27 when the roots blower 60 is operated in the reverse rotation operation. Reference numeral 30 denotes a water supply valve provided on a side surface of the box 21 for washing the filter 24 with water. 31 is the suction chamber 2
A drain valve provided at the bottom of the second 2, and functions as a take-out unit for collecting fine dust settling by the washing.

The second screen 40 has a mesh of 0.1.
A filter 43 having a cylindrical shape using a nonwoven fabric having a thickness of about 0.5 μm is provided. In the first embodiment,
A nonwoven fabric of 0.3 μm was used. The filter 43 is
It is attached to the lid 42 of the box 41 so as to cover the exhaust port 42b. Reference numeral 44 denotes a bolt for attaching the lid 42 to the box 41. The intake port 41a of the box 41 and the exhaust port 23b of the first screen 20 are connected by a pipe 45 or a flexible hose. 46 is a drain valve attached to the bottom of the box 41.

The third screen 50 divides the internal space of the box body 51 with a mesh-like partition plate 52, and separates the partition plate 5 on the intake port 51a side.
2 is provided with a cylindrical filter 53 wound with hollow fibers made of polysulfone resin having a pore diameter of 0.1 μm. 54
Is an upper lid fastened to the box body 51 with bolts 55. The intake port 51a of the box 51 and the exhaust port 42b of the second screen 40 are connected by a pipe 56 or a flexible hose. Reference numeral 57 denotes a drain valve attached to the bottom of the box body 51.

The roots blower 60 uses a three-lobe type roots blower capable of switching between forward and reverse rotations. In the reverse rotation operation, the suction side 61 is the discharge side and the discharge side 62 is the suction side. Reference numeral 65 denotes a suction pipe connecting the suction side 61 of the roots blower 60 and the exhaust port 51b of the third screen 50. 66 is a vacuum gauge attached to the suction pipe 65. In addition, in order to start the inverter and control the inching operation of the motor device that drives the roots blower 60, it is also possible to provide an electrical box incorporating a dedicated sequence.

As described above, when the roots blower 60 is operated in the normal operation, the fine dust is collected from the collection unit 10 and the air is discharged into the screen during the reverse operation to clean each filter. A dust collection device A is configured.

The dust collector B (not shown) according to claim 2, wherein the third screen 50 of the dust collector A is abolished, and the other structure is configured in accordance with the dust collector A.
Is obtained.

FIG. 2 shows a portable dust collector C according to a third aspect. The portable dust collector C has a structure in which a series of structures of the dust collectors A or B described above are installed on the gantry 100 with casters, and is miniaturized and provided so as to be movable to an arbitrary place. Specifically, the suction side 16 of the roots blower 160
1, an exhaust port 141b of the second screen case 141;
Are connected by a suction pipe 165. The connection structure between the small trumpet-shaped collection portion 110 and the first screen 120, the exhaust port 123 b of the first screen case 121, and the intake port 141 a of the second screen case 141 is similar to that of the dust collector A. Provide. 101 is a flexible hose,
127 is an introduction pipe in which a butterfly type check valve 128 is provided;
129 is a sputter trap.

At the bottom of the suction chamber 122 of the first screen 120, a container 131 for taking out fine dust, which replaces the drain valve 31 of the dust collector A, is provided detachably. Similarly, the second screen 140 is also taken out of the container 14.
6 is provided. In addition, the extraction part of the fine dust collection device A of the dust collection device may have such a structure.

FIG. 4 is a graph showing the results of a comparison experiment of dust collection efficiency between the above-described dust collectors A to C of the present invention and the conventional dust collector described above. Fume dust generation amount during manual arc welding work 400mg /
Under the conditions of m ³ , the air volume of the dust collector of the present invention of 1.0 m ³ / min, and the air volume of the conventional dust collector of 20 m ³ / min, the measurement of dust
The test was performed using TA (manufacturer name) MODEL P-5L. In addition, the recovery efficiency in the graph was calculated by the following equation (1).

[0024]

(Equation 1)

As a result of the experiment, it was confirmed that all of the dust collectors A to C of the present invention achieved a high collection efficiency of 99.9% or more. Note that the cleanliness level in the above graph is 130 mg.
The value of / m ³ is the amount of fume dust generated by the automatic welding machine, and the value of 0.001 mg / m ³ indicates the amount of fine dust in the clean room. In addition, it should be noted that the amount of air sucked and discharged in the conventional dust collector is 20 m ³ / min, which is larger than that of the device of the present invention, and the fume dust is diluted and discharged to the outside. On the other hand, the dust collectors A to C of the present invention have a structure in which dust is efficiently collected with a small air flow of 1.0 to 2.0 m ³ / min. Has little effect on the environment, and this also demonstrates that the performance of the device of the present invention is excellent.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a dust collector A.

FIG. 2 is a front view showing a part of the portable dust collector in a cutaway manner.

FIG. 3 is a side view showing a part of the apparatus in a cutaway manner.

FIG. 4 is a graph showing dust collection efficiency.

[Explanation of symbols]

A to C → Dust collector 10 → Collection part 20 → First screen 24 → Filter 31 → Drain valve (take-out part) 40 → Second screen 43 → Filter 50 → Third
Screen 51b → Exhaust port of the third screen 53 → Filter 60 → Roots blower (displacement blower) 61 → Suction side 100 → Casting stand 110 → Collection part 160 → Roots blower 161 → Suction side

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masami Kato 160-1 of Kanie Honcho, Kanie-cho, Kaifu-gun, Aichi Prefecture 1 in Anlet Co., Ltd. (72) Inventor Toshiaki Kato, Kanie-cho, Kaie-cho, Kaifu-gun, Aichi 160-1 Honmachi-no-ho, Anlet Co., Ltd. (72) Inventor Koichi Kume Koichi-cho, Kaifu-gun, Aichi Prefecture Kanie-Honcho, 160-No.1 Anlet, Inc. (72) Inventor Takashi Yokoi Aichi 160-1 Kanie Honcho, Kanie-cho, Kaifu-gun 1 in Anlet Co., Ltd. (56) References Japanese Utility Model 57-191422 (JP, U) Japanese Utility Model Hei 6-575 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B01D 46/00-46/54 B23K 9/32

Claims (3)

(57) [Claims] 1. A collecting section for collecting fine dust, a first screen provided with a filter filled with a solid piece as a crushed material of a PET bottle, and a nonwoven fabric having a mesh of 0.1 to 0.5 μm. A second screen provided with a filter having a surface coated with Teflon, and a third screen provided with a filter wound with hollow fibers having a pore diameter of 0.1 μm are connected in series, An exhaust port of the third screen is connected to the suction side of the positive displacement blower capable of switching operation, and the fine dust is collected from the collection unit during normal rotation operation of the positive displacement blower, and the outside air is discharged during reverse rotation operation. Each filter is discharged into the screen to wash each filter, and a take-out part for collecting fine dust settled by the washing is provided at the bottom of each screen. That dust collector. 2. A collecting section for collecting fine dust, a first screen provided with a filter filled with a solid piece as a crushed material of a PET bottle, and a non-woven fabric having a mesh of 0.1 to 0.5 μm. A second screen provided with a filter having a surface coated with Teflon, and connecting the screens in series, and connecting an exhaust port of the second screen to a suction side of a positive displacement blower capable of switching between forward and reverse operations. Then, during the normal rotation operation of the same displacement type blower, the fine dust is collected from the collection unit, and at the time of the reverse rotation operation, the outside air is discharged into the screen to wash each filter, and the cleaning is performed. A dust collector, wherein a take-out part for collecting sedimented fine dust is provided at the bottom of each screen. 3. The portable dust collector according to claim 1, wherein the dust collector is mounted on a pedestal with casters and is movable.