JP4925613B2 - Wet dust collector - Google Patents

Description

  The present invention relates to a wet dust collector, and in particular, wet dust collector that efficiently collects fume dust generated during processing of a processing machine such as a laser and a plasma processing machine, or room temperature dust such as shot blast and sander generated in large quantities. Relates to the device.

  Conventionally, when processing with a processing machine such as a laser and a plasma processing machine, very high temperature fume dust of 200 ° C. to 300 ° C. is generated. As devices for collecting the fume dust, a dry filter type dust collector and a wet dust collector are known.

  Compared to dry dust collectors, wet dust collectors can be operated unattended at night because there is no fear of fire, and by adding water, dust is solidified to some extent and post-treatment becomes much easier. In addition, because dust does not rise, the working environment is good, there is no pressure loss change due to filter clogging, etc., dust suction efficiency is constant, processing accuracy is stable, and water can remove odors Since it has many merits such as being able to have a deodorizing function, a wet dust collector is advantageous in the case of processing by a laser and a plasma processing machine.

  However, in wet dust collectors, dust is attached to the mist to cool the dust, large water droplets are collected directly in the water, and small water droplets are supplemented with a filter, so how efficiently the dust is attached to the mist. Is an important point. In practice, gas (dusty air) and liquid (water) are mixed to collect dust, but the above gas / liquid mixing is performed efficiently, and at the same time, gas / liquid separation is performed on the exhaust side. It is necessary to have a so-called conflicting action.

  Moreover, since a device such as a mist generating device for efficiently generating the mist described above is required, the device configuration is more complicated and larger than that of the dry dust collector. This is also an important point.

  Referring to FIG. 5, in a conventional wet dust collector 101, for example, as disclosed in Patent Document 1, a housing 103, a suction channel 105 for air AR including dust P formed in the housing 103, and the above-mentioned A water tank portion 107 disposed in the housing 103, a mist chamber 109 formed at the top of the water tank portion 107, a filter 111 disposed on the downstream side of the mist chamber 109, and the dust P And a fan 113 that sucks into the filter 111 from the flow path 105 through the mist chamber 109. Further, a mist generating body 115 is disposed at a site where the suction flow path 105 communicates with the mist chamber 109, and the dust-containing air sucked into the suction flow path 105 as shown in FIGS. AR is sprayed on the mist generator 115 at a high speed to cause the water surface WS to vibrate at a high frequency to generate mist M in the mist chamber 109. After the high temperature dust P is adsorbed to the mist M and cooled, the dust-containing mist M is There is one configured to collect dust P and moisture (mist M) by being collected by the filter 111.

  As shown in FIGS. 6 and 7, the mist generator 115 is elongated by a comb tooth portion 117 formed of continuous irregularities being immersed in the water surface WS stretched on the water tank portion 107. Since the dust-containing air flow path 119 is defined by the main body of the mist generator 115 and the water surface WS, a large number of very small dust-containing air flow paths 119 are formed side by side. Accordingly, the fume dust P sucked into the suction flow path 105 flows into the above-described elongated dust-containing air flow path 119 except for the dust falling into the water in the water tank portion 107 as it is. The dust-containing air AR that has flowed in flows into the mist chamber 109 through the dust-containing air flow path 119. At this time, as shown in FIG. 6, the dust-containing air AR passing through the dust-containing air flow path 119 vibrates the water surface WS at high speed, so that mist M is generated and floats in the mist chamber 109. A suitable mist atmosphere is generated.

  Further, in another conventional wet dust collector, as in Patent Document 2, for example, above the room corresponding to the mist chamber 109 of Patent Document 1 above, an inclined ceiling plate, and above the ceiling plate, A plurality of inclined plates are provided alternately. That is, water droplets and airflow generated in a room corresponding to the mist chamber 109 collide with the ceiling plate and are bent downward by a hanging plate provided at the tip of the ceiling plate. Thereafter, the airflow flows upward, the inclined plate is bent in a zigzag shape, and is discharged by the upper fan. In this process, the moisture of the airflow collides with the ceiling plate and the inclined plate to form water droplets, and the dust P contained in the water droplets is removed.

  Further, in another conventional wet dust collector, for example, as in Patent Document 3, upper and lower guide plates for allowing dust-containing airflow to pass above a room corresponding to the mist chamber 109 of Patent Document 1 above. Each end portion of the upper and lower guide plates is bent obliquely downward, and a discharge port of a passage formed between the upper and lower guide plates is opened obliquely downward. As a result, the gas-liquid separation effect is enhanced, and the amount of mist discharged is further reduced.

That is, as shown in FIG. 8, the water droplet WD is dropped by a so-called collision plate or draining plate 121 such as the ceiling plate and the inclined plate of Patent Document 2 or the guide plate of Patent Document 3. It is configured. Further, since the water droplets WD and the air AR (airflow) are agitated by the collision plate, the water draining plate 121, etc., there is also an effect that the water droplets WD are naturally dropped in the flow of the air AR after the mist is generated.
Japanese Patent Laid-Open No. 9-10536 Japanese Utility Model Publication No. 7-21211 JP 2003-220315 A

  By the way, in the conventional wet dust collector 101 like patent document 1, when dust-containing air AR is sprayed on the mist production | generation body 115 at high speed, the bubble B generate | occur | produces in water as FIG. 6 shows. Since the bubbles B flow as they are, the dust P inside the bubbles B does not come into contact with water and is discharged as it is, so there is no dust-compensating effect. Rather, the mist M is generated in the mist chamber 109. After the mist is generated, the high temperature dust P is adsorbed and cooled by the mist M, and the mist M naturally falls as water droplets WD in the flow of the air AR. Is.

  However, the contact between the mist M, the water droplet WD, and the dust-containing air AR is unambiguous and low in efficiency. Moreover, since the large water droplet WD has a small specific surface area, efficient dust collection is not performed. In addition, since the water droplet WD falls quickly, there is a problem that effective gas / liquid contact cannot be achieved.

  Further, in the conventional wet dust collectors such as Patent Documents 2 and 3, as shown in FIG. 8, the water droplet WD is dropped by the collision plate or the draining plate 121, but the air volume of the air AR that is sucked in When the number is increased, there is a problem that the water droplet WD cannot be sufficiently dropped. That is, as shown in FIG. 8, since the edge position 123 of the collision plate or the draining plate 121 and the passage position of the air AR are the same, the water droplet WD adhering to the wall surface of the collision plate or the draining plate 121 is The water droplet WD that moves diagonally downward through the wall surface and falls from the edge portion 123 rises again on the air AR from below and is carried to the blower in the subsequent process. That is, there is a problem that gas / liquid separation is insufficient (incomplete).

  Therefore, in conventional wet dust collectors, it has been insufficient to efficiently perform the so-called conflicting effects of performing gas / liquid mixing efficiently and simultaneously performing gas / liquid separation on the exhaust side.

  The present invention has been made to solve the above-described problems.

The present invention has been made in view of the above-described problems, and includes a housing (3) provided with a water tank (5) in a lower part, and a water content (WS) above the water surface (WS) of the water tank (5). An air inlet (7) for sucking air into the housing (3) , and dust-containing air for guiding the dust-containing air sucked from the air inlet (7) toward the water surface (WS) of the water tank (5) It communicates with the dust-containing air guide chamber (9) through the induction chamber (9) and the opening (13) located on the water surface (WS) , and generates mist and vents the dust-containing air and mist. gas-liquid mixing chamber for Hochiri into mist by the liquid mixed with (11), the dust-containing air mixed gas and liquid in the gas-liquid mixing chamber (11) the gas-liquid mixing chamber communicates with the upper (11) a gas-liquid separation chamber (19) for separating the water droplets and the air from being separated from the water droplets in the gas-liquid separation chamber (19) d The a blower unit for exhaust (31) from the exhaust port (29), inside the gas-liquid mixing chamber (11), a plurality of plate-shaped wave absorbing member having a plurality of through holes (15) (17 ) Are arranged in parallel in the vertical direction with an appropriate interval, and the plurality of wave-dissipating members (17) are arranged inside the gas-liquid mixing chamber (11) of the dust-containing air induction chamber (9). Between the side wall and the side wall (3A) of the housing (3), a plurality of upper and lower parts are provided in parallel above and below the opening (13) .

Further, in the wet dust collector, a flange portion (23A) for collecting and draining water droplets flowing toward the tip side while the tip side is inclined downward is provided in the gas-liquid separation chamber (19) on the tip side. A plurality of inclined draining plates (23) provided inward at the lower portion are provided alternately in stages .

  As understood from the means for solving the above problems, according to the present invention, in the gas-liquid mixing chamber, dust-containing air (gas) is provided by a plurality of wave-dissipating members arranged in parallel in the vertical direction. Encourage mixing of mist with water droplets (liquid), and at the same time increase water vapor contact by reducing water droplet size, increasing specific surface area, destroying water droplets, changing wind direction, and constricting air flow And dust in the dust-containing air can be efficiently absorbed by water droplets. That is, gas-liquid mixing can be promoted by forcibly mixing and crushing mist bubbles and water droplets by the plurality of wave-dissipating members.

  Further, in the gas-liquid separation chamber, by providing one or a plurality of draining members and providing a flange portion at the tip of each draining member, water droplets generated when the gas-liquid mixed dust-containing air collides with the draining member. By collecting water efficiently and draining it, the dust-containing water droplets and air can be efficiently and completely separated from the dust-containing air.

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

  Referring to FIG. 1, a wet dust collector 1 according to this embodiment includes fume dust generated during processing by a processing machine such as a laser and a plasma processing machine, or room temperature dust such as shot blast and sander generated in large quantities. That efficiently collect dust.

  The wet dust collector 1 includes a housing 3 as an apparatus main body. A water tank 5 is provided in a lower portion inside the housing 3, and a water surface WS of the water tank 5 is provided on a side wall 3 </ b> A of the housing 3. An intake port 7 is provided at a higher position for sucking dust P together with the intake air AR (hereinafter, the intake air AR including the dust P is referred to as “dust-containing air”). Dust-containing air that guides the dust-containing air AR sucked into the housing 3 from the intake port 7 downward toward the water surface WS of the water tank 5 is approximately at the center (center) in the horizontal direction inside the housing 3. An induction chamber 9 is provided.

  Referring also to FIG. 2, mist M such as water droplets WD, mist, and bubbles B is generated around the dust-containing air guiding chamber 9 and the water droplets WD and bubbles B of the mist M are finely divided. A gas-liquid mixing chamber 11 for efficiently gas-liquid mixing and supplementing the water droplets WD and the bubbles B is provided between the side wall 3A of the housing 3 and the dust-containing air guiding chamber 9. The gas-liquid mixing chamber 11 communicates with the dust-containing air induction chamber 9 through an opening 13 provided on the side wall of the dust-containing air induction chamber 9 over the entire circumference. In addition, the water surface WS of the water tank 5 is located at the approximate center of the opening 13 in this embodiment between the openings in the vertical direction of the opening 13.

  The gas-liquid mixing chamber 11 may be composed of a plurality of divided gas-liquid mixing chambers 11 around the dust-containing air guiding chamber 9 with some partition walls inside the housing 3. Accordingly, the opening 13 may be intermittently provided on the side wall of the dust-containing air guiding chamber 9 for each of the plurality of divided gas-liquid mixing chambers 11.

  The gas-liquid mixing chamber 11 is a flat plate having a large number of through-holes 15 in the upper and lower portions with the opening 13 interposed therebetween, as shown in FIGS. For example, a plurality of wave-dissipating plates 17 as a wave-dissipating member are arranged in parallel with each other at an appropriate interval substantially parallel to each other. In this embodiment, the wave-dissipating plate 17 is a perforated plate provided with a large number of small through holes 15 such as a punching plate as shown in FIG.

  The wave-dissipating plate 17 above the opening 13 is not limited to the punching plate described above, and any wire net, metal wool, ceramic perforation can be used as long as the water droplets WD and bubbles B of the mist M can be divided. A plate or other forms may be used. Further, the wave-dissipating plate 17 below the opening 13 is not limited to the punching plate described above, and can be a wire mesh, metal wool, ceramic perforated plate, or other form as long as the wave-dissipating effect can be expected. It doesn't matter.

  Therefore, the dust-containing air AR sucked into the housing 3 from the air inlet 7 is guided downward toward the water surface WS of the water tank 5 in the dust-containing air guide chamber 9, and the dust-containing air AR vibrates the water surface WS. When a wave is generated, as shown in FIGS. 1 and 2, in the gas-liquid mixing chamber 11, fine mist M such as water droplets WD, mist, and bubbles B is generated by a plurality of lower wave-dissipating plates 17. To do. The dust-containing air AR in the dust-containing air induction chamber 9 flows into the gas-liquid mixing chamber 11 from the opening 13 and the mist M passes through the plurality of wave-dissipating plates 17 together with the dust-containing air AR. Will rise. At this time, since the water droplets WD and the bubbles B in the mist M hit the next wave-dissipating plate 17 and are crushed, the water droplets WD and the bubbles B are reduced and the specific surface area is increased. Thus, the dust P can be efficiently collected in the water droplets WD and the bubbles B.

  Here, in order to make the explanation easy to understand, the main water droplet WD in the mist M will be described as an example.

  More specifically, fine water droplets WD generated on the first wave-dissipating plate 17 pass through the through holes 15 of the second wave-dissipating plate 17 along the air flow. At this time, the water droplet WD approaches and collects the dust-containing air AR because the cross-sectional area of the through-hole 15 of the wave-dissipating plate 17 is blocked or reduced by the water droplet WD. Further, since the wind speed increases near the through hole 15 of the wave-dissipating plate 17, relatively large water droplets WD are destroyed, and even when the water droplets WD become small, gas / liquid contact is increased and collection efficiency is improved. . This effect occurs between the plurality of wave-dissipating plates 17.

  Furthermore, the gas / liquid flow is disturbed between the plurality of wave-dissipating plates 17, thereby increasing the chance of gas / liquid contact. In other words, when the dust-containing air AR that has passed through the through-hole 15 of the wave-dissipating plate 17 spreads, the flow velocity decreases and the direction changes, and the contact between the dust-containing air AR and the water droplets WD increases.

  As described above, as a result of the increased contact between the dust-containing air AR and the water droplets WD, the dust P in the dust-containing air AR can be efficiently collected in the water droplets WD.

  In addition, since the mist M such as the water droplets WD and the bubbles B is generated in the entirety of the plurality of wave-dissipating plates 17, there is no local large resistance, and the mist M can be generated with minimal airflow reduction. .

  The plurality of wave-dissipating plates 17 at the bottom are for preventing the generation of large waves and promoting the generation of fine water droplets WD. Moreover, energy loss (air volume reduction) can be prevented. For example, when the dust-containing air AR guided downward in the dust-containing air guiding chamber 9 vibrates the water surface WS of the water tank 5, the water surface WS during non-operation shown by the solid line in FIG. Although it undulates, it is obstructed by a plurality of lower wave-dissipating plates 17 below the water surface WS, and water passes through a large number of through-holes 15 in the wave-dissipating plate 17 so that it is more than necessary. Waves are suppressed so as not to generate large waves of water and are promoted to generate fine water droplets WD.

  As described above, the water droplets that efficiently collect the dust P in the dust-containing air AR by efficiently mixing the dust-containing air AR (gas) and the water droplets WD (liquid) in the gas-liquid mixing chamber 11. Next, the WD needs to be efficiently separated from the air AR that does not contain the dust P. Therefore, a gas-liquid separation chamber 19 for separating the water droplet WD containing the dust P and the air AR is provided above the gas-liquid mixing chamber 11 so as to communicate with the gas-liquid mixing chamber 11. ing.

  In the lower part of the gas-liquid separation chamber 19, a horizontal draining plate 21 that first promotes gas-liquid separation and rectifies the air AR is located near the boundary with the gas-liquid mixing chamber 11 from the center side. 3 in a state of protruding in a substantially horizontal direction toward the side wall 3A. A communication port for the gas-liquid mixing chamber 11 and the gas-liquid separation chamber 19 is formed between the front end of the horizontal drain plate 21 and the side wall 3A of the housing 3.

  Further, for example, an inclined draining plate 23 as a plurality of draining members whose front end side is inclined downward is provided in the middle and upper part of the gas-liquid separation chamber 19 in the direction of the center of the housing 3 or vice versa. It is provided in a staggered manner so as to protrude in the direction toward 3A. For example, in this embodiment, the first-stage inclined drain plate 23 protrudes from the side wall 3A of the housing 3 toward the center, and the second-stage inclined drain plate 23 extends from the center of the housing 3, that is, a mechanical filter described later. It protrudes toward the outer peripheral direction from 25 support members.

  Each inclined draining plate 23 is provided with a flange 23A that receives and collects and drains water droplets WD that collide with and adhere to the inclined draining plate 23 at the tip in a direction inclined downward. The cross-sectional shape of the flange 23A may be any shape such as an R (curved) shape such as a round shape or an oval shape, a polygon shape, other shapes, or a combination thereof. In this embodiment, the flange portion 23A is integrally bent into an R shape with the tip end portion of the inclined draining plate 23 directed from the bottom to the inside. That is, since the bottom surface of the inclined draining plate 23 and the inner surface of the flange portion 23A are continuous, for example, the configuration is not affected by the air AR passing through the right outer side in FIG. 4 of the flange portion 23A.

  Therefore, when the dust-containing air AR mixed in the gas-liquid mixing chamber 11 rises in a zigzag manner as shown by the solid line arrows in FIG. 1, the dotted lines in FIG. When it collides with the inclined water draining plate 23 as indicated by the arrow, water droplets WD in the dust-containing air AR adhere to the lower surface of the inclined water draining plate 23 as shown in FIG. The adhering water droplet WD passes through the lower surface of the inclined draining plate 23 and moves obliquely downward and flows directly to the flange 23A.

  Since the water droplet WD collected by the inclined water draining plate 23 is guided and drained laterally using the flange 23A, the water droplet WD dropped from the front end of the water draining plate as in the prior art is again supplied from below the air AR. It can be prevented from being carried on the vehicle. Even if the water droplet WD overflows from the flange portion 23A, the water droplet WD is generated not at the tip portion where the wind speed is fast but at the inside where the wind speed is slow, so that it will surely fall without getting on the air AR. As described above, gas / liquid separation is performed efficiently and completely (sufficiently).

  In addition, a mechanical filter 25 for further removing the fine dust P remaining in the air AR separated in the gas-liquid separation chamber 19 is disposed downward at the upper portion of the gas-liquid separation chamber 19. It is provided in a conical shape (mortar shape). In this design, the inclined water drain plate 23 is supported from the mounting portion of the mechanical filter 25, but may be supported by the side wall 3 </ b> A of the housing 3.

  Further, above the mechanical filter 25, the above-described dust-containing air AR is sucked from the intake port 7 to the mechanical filter 25 through the dust-containing air induction chamber 9, the gas-liquid mixing chamber 11, and the gas-liquid separation chamber 19. A blower unit 31 having a fan (not shown) for exhausting the air AR that has passed through the mechanical filter 25 and cleaned to the outside from an exhaust port 29 provided at the top of the housing 3 is provided.

  From the above, in the gas-liquid mixing chamber 11, the wet dust collector 1 of this embodiment can prevent generation of waste waves and generate fine mist M in the lower wave-dissipating plate 17. it can. In addition, the upper wave-dissipating plate 17 forcibly promotes mixing of the dust-containing air AR (gas) and the water droplet WD (liquid), and at the same time reduces the size of the water droplet WD to increase the specific surface area, thereby destroying the water droplet WD. By changing the wind direction and the flow of the dust-containing air AR, the gas-liquid contact can be increased, and the dust P in the dust-containing air AR can be efficiently absorbed by the water droplets WD. In other words, gas-liquid mixing can be promoted by forcibly mixing and pulverizing the bubbles B and the water droplets WD of the mist M by the plurality of wave-dissipating plates 17.

  Further, in the gas-liquid separation chamber 19, by providing one or a plurality of inclined draining plates 23 and a flange portion 23 </ b> A at the tip of each inclined draining plate 23, the dust-containing air AR mixed with gas and liquid is inclined to the inclined draining plate 23. By efficiently collecting and draining the water droplets WD generated by colliding with each other to the flange 23A, the dust-containing water droplets WD and the air AR can be efficiently and completely separated from the dust-containing air AR.

1 is a schematic cross-sectional view of a wet dust collector according to an embodiment of the present invention. It is a partial detailed enlarged view of the gas-liquid mixing chamber of FIG. It is a top view of the wave-dissipating plate of FIG.1 and FIG.2. It is the elements on larger scale of the inclined draining board of the gas-liquid separation chamber of FIG. It is a schematic sectional drawing of the conventional wet dust collector. FIG. 6 is a partial detail enlarged view of the mist chamber of FIG. 5. It is a front view of the mist production | generation body of FIG. It is the partial detail enlarged view of the conventional draining board.

Explanation of symbols

1 Wet dust collector 3 Housing 3A Side wall (of housing 3)
5 Water tank 7 Air inlet 9 Dust-containing air induction chamber 11 Gas-liquid mixing chamber 13 Opening portion 15 Through-hole 17 Wave-dissipating plate (wave-dissipating member)
19 Gas-liquid separation chamber 21 Horizontal drain plate 23 Inclined drain plate (drain member)
23A collar 25 mechanical filter 27 vertical rectifying plate 29 exhaust port 31 blower

Claims (2)

A housing (3) provided with a water tank (5) at the lower part, and an intake port (7) which is located above the water surface (WS) of the water tank (5) and sucks dust-containing air into the housing (3 ) A dust-containing air induction chamber (9) for guiding the dust-containing air sucked from the intake port (7) toward the water surface (WS) of the water tank (5) , and an opening located on the water surface (WS) A gas-liquid mixing chamber (11 ) that communicates with the dust-containing air guiding chamber (9) through a section (13) , generates mist, and mixes the dust-containing air and mist with gas and liquid to supplement the mist. a), the gas-liquid mixing chamber (11) of the gas-liquid mixing chamber communicating with the upper (11) gas-liquid separation chamber for separating the water droplets and the air from the gas-liquid mixed dust containing air in (19), blower unit for exhausting the water droplets and separated air in the gas-liquid separation chamber (19) from the exhaust port (29) and (31) Provided, inside the gas-liquid mixing chamber (11), there are provided in parallel through the appropriate intervals plurality of plate-shaped wave absorbing member having a plurality of through holes (15) and (17) in the vertical direction The plurality of wave-dissipating members (17) are disposed between the side wall of the dust-containing air guiding chamber (9) and the side wall (3A) of the housing (3) inside the gas-liquid mixing chamber (11). A wet dust collector , wherein a plurality of upper and lower portions are provided in parallel above and below the opening (13) . The wet dust collector according to claim 1, wherein the gas-liquid separation chamber (19) has a flange portion (23A) for collecting and draining water droplets flowing toward the tip side while the tip side is inclined downward. A wet type dust collector comprising a plurality of inclined draining plates (23) provided inward at a lower portion on the front end side in a staggered manner .

Images