JP2017217625A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of being heavy in a burden of maintenance in an existing air cleaner, though there is conventionally an air cleaner for passing exhaust gas before discharging outdoors.SOLUTION: A projection part 5 with a cover 7 is provided in a vertical type cylindrical body 19, and a tip part (an edge) 33 of a needle-like electrode 31 turns to the doorway side of the projection part 5. Since the needle-like electrode 31 causes discharge between edge parts 27 and 27 of becoming a counter electrode, exhaust gas of becoming a swirling flow (A) is guided to the projection part 5 via a slit 25, and stays as a small swirling flow (a). A polluted particle (C) is electrified in a polarized state by receiving electric charge (e) from an electron flow (E), and thus, is coagulated by electrostatic attraction of the mutual polarized parts. The polluted particle (C) collides or drops on a side surface of the projection part 5 and sticks there when mass becomes large by coagulation. The projection part 5 can be easily cleaned by opening the cover 7.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an air purifier suitable for passing exhaust gas before it is released outdoors.

The factory produces exhaust gas in which various pollutants are mixed as airborne particles, such as oil mist discharged from internal combustion engine test equipment and dust discharged from food processing equipment. There is a demand to release it after processing it so as not to adversely affect it.
Correspondingly, an air purifier has been conventionally used. Typical examples thereof are as described in Patent Document 1, in which contaminants are absorbed in water, captured using a filter, or as described in Patent Document 2, the contaminants are electrically adsorbed. It is something to let you.

JP 2007-117921 A JP 2002-166195 A JP, 2015-182033, A

Thus, if water is used, large-scale wastewater treatment is required. In addition, if a filter is used, frequent cleaning or replacement of the filter is required, and contaminants that can be removed are limited to those that can be captured by the filter.
Patent Document 2 is of an electric dust collection type, in which pollutants are charged and electrically adsorbed on a dust collection cylinder. Although no filter waste is produced, the distance from the discharge electrode to the dust collecting cylinder that becomes the counter electrode cannot be secured, so that contaminants that have been dried due to excessive heat accumulate on the dust collecting cylinder. If such deposits are left unattended, air purification performance deteriorates due to the progress of clogging, and there is a risk of fire due to dry pollutants, so frequent maintenance is required.
As described above, in any case, the existing apparatus is still unsatisfactory in terms of contaminant removal performance, post-processing and maintenance burden.

On the other hand, the present applicant has previously proposed an air purification device using electrostatic attraction and centrifugal force as Patent Document 3. According to this apparatus, a filter and water are unnecessary, and further, the distance from the discharge electrode to the dust collecting cylinder can be taken.
Thus, this air purifying device is intended to purify indoor air and forcibly introduces processing air into the device using a blower. Considered not to break.
On the other hand, in a dust collector that passes exhaust gas generated from a treatment device before it is released to the outside, there is no need to consider the indoor atmosphere because the exhaust gas carried from the treatment device through a pipe or the like is the target of treatment. Rather, in order to enable efficient operation, the priority should be to reduce the maintenance burden on the air purifier side.

  The present invention has been made paying attention to the above-mentioned conventional problems, and is an air purifier that passes exhaust gas generated from a processing apparatus before being released outdoors, and uses electrostatic attraction and centrifugal force. It is an object of the present invention to provide a new and useful air purifier in which the burden of maintenance is remarkably reduced by collecting dust and further devising the structure.

  In order to achieve the above object, the invention of claim 1 is directed to a vertical cylindrical body through which exhaust gas to be treated is passed, a slit formed in a peripheral surface of the cylindrical body, and the cylindrical body surrounding the slit. A projecting portion projecting outside and having a conductive surface on the inner surface, a lid disposed on the projecting portion, and provided in the cylindrical body, on the projecting section side from the central axis of the cylindrical body The discharge electrode arranged at a position deflected to the opposite side, the counter electrode provided on the edge side of the slit, and the exhaust gas passed through the cylindrical body to form a swirling flow that rotates while rotating around the central axis. The air purifier includes a swirl flow forming means that passes therethrough, and the inside of the projecting portion is a staying region in which the exhaust gas flowing into the projecting part stays.

  According to a second aspect of the present invention, in the air purifier according to the first aspect, the edge side of the slit projects toward the exhaust gas inlet / outlet side of the projecting portion to narrow the inlet.

  A third aspect of the present invention is the air purifier according to the first or second aspect, wherein the projecting portion is provided with an adsorption structure portion.

  According to a fourth aspect of the present invention, in the air purifier according to any one of the first to third aspects, an opening is formed separately from the slit on the bottom side of the cylindrical body, and the opening is also closed by a lid. It is an air purifier.

  A fifth aspect of the present invention is the air purifier according to any one of the first to fourth aspects, wherein the air purifier is interposed in an exhaust gas discharge line to the outdoors.

  The air purifier of the present invention is suitable as an air purifier that allows exhaust gas to pass through before being discharged outdoors, and the burden of maintenance is greatly reduced.

It is the upper side figure and front view of the air cleaner which concern on embodiment of this invention. It is the upper cross-sectional view and longitudinal cross-sectional view of the air purifier of FIG. It is an image figure of the air purification in the air cleaner of FIG. It is an image figure of the air purification in the air cleaner of FIG. It is an image figure of the air purification in the air cleaner of FIG. It is explanatory drawing of another example of the protrusion part of the air cleaner of FIG.

A stationary air purifier 1 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the air purifier 1 includes a housing 3 as an outer portion. The housing 3 has a vertically long rectangular box shape, and a large opening of a vertically long rectangle is formed in the front. In this opening, a vertically long rectangular box-shaped projecting portion 5 is fitted and fixed, and the front side of the projecting portion 5 projects forward. An opening is formed on the front surface of the projecting portion 5, which is closed with a horizontal lid 7. The projecting portion 5 includes a front side and four side surfaces that stand up around the front side, and the back side that enters the housing 3 is open.
Further, another horizontally-long rectangular opening is formed on the front surface of the housing 3 near the bottom surface, but this is closed by a horizontal lid 9.
Therefore, when the horizontal lid 7 and the horizontal lid 9 are opened, the housing 3 is opened.

The housing 3 is provided with an exhaust gas inlet 11 at the lower part of the right side and an exhaust gas outlet 13 at the upper part of the opposite left side. The suction port 11 and the exhaust port 13 are both arranged on the back side.
Bellows-like tubes 15 and 15 are connected to the respective mouths 11 and 13. The tube 15 on the suction port 11 side is connected to a processing device (not shown) that emits exhaust gas, and the tube 15 on the exhaust port 13 side is connected to an exhaust port (not shown) provided on the wall of the factory. That is, the air purifier 1 is interposed in an exhaust gas discharge line to the outdoors.

As shown in FIG. 2, the interior of the housing 3 is vertically divided by a plate-like partitioning portion 17, and a vertical cylindrical body 19 is housed as a dust collection cylinder on the upper side. The cylindrical body 19 is in a state in which the central axis stands up and down. The top side which is one axial end side of the cylindrical body 19 is in contact with the inner surface of the upper wall of the housing 3 and is closed.
On the other hand, the partition part 17 is formed with a circular hole, and a cylindrical body 19 is erected along the hole edge. Accordingly, the bottom side which is the other axial end side of the cylindrical body 19 communicates with the inside of the housing 3. The above-described horizontal lid 9 is arranged on the front side of the space below the partition portion 17, and when the horizontal lid 9 is opened, the inside of the housing 3 opens through the space of the partition portion 17.

One end side of the suction pipe 21 is connected to and communicates with the cylindrical body 19 in order to allow the exhaust gas to flow in the tangential direction. On the other hand, the other end of the suction pipe 21 is a suction port 11 of the housing 3. The heights of the connection positions at both ends are the same, and the suction pipe 21 is disposed so as to face in the horizontal direction.
In addition, one end side of the exhaust pipe 23 is connected to and communicates with the cylindrical body 19 so that the exhaust gas flows out in the tangential direction. The other end side of the exhaust pipe 23 is an exhaust port 13 of the housing 3. The heights of the connecting positions at both ends are the same, and the exhaust pipe 23 is disposed so as to face in the horizontal direction.
There is a connecting portion between the cylindrical body 19 and the exhaust pipe 23 immediately above the connecting portion between the cylindrical body 19 and the suction pipe 21, and the suction pipe 21 and the exhaust pipe 23 appear to be in series from above.

A blower (not shown) is interposed in the tube 15 connected to the exhaust pipe 23, and by operation of the blower, the processing device, the tube 15, the suction pipe 21, the cylindrical body 19, the exhaust pipe 23, and the tube 15. -A flow of exhaust gas connected to the outdoor exhaust port is formed.
In the cylindrical body 19, the exhaust gas turns into a swirling flow that flows upward while rotating around the central axis due to the inflow of exhaust gas from the tangential direction and the outflow of exhaust gas in the tangential direction. That is, as indicated by the one-dot chain line arrow (A) in FIG. 3, it flows upward while rotating around the central axis of the cylindrical body 19.
The intake port 11 and the exhaust port 13, which are the exhaust gas inlet and outlet, are designed to be sufficiently small with respect to the cylindrical body 19, and a sufficiently large turning speed is secured in the cylindrical body 19. Yes.

The protruding portion 5 described above is fixed and integrated with the outer peripheral surface of the cylindrical body 19 inside the housing 3.
The cylindrical body 19 is formed with a vertically long rectangular slit (missing portion) 25. The slit 25 is located on the front side of the housing 3 and faces the horizontal lid 7 on the front side of the protruding portion 5. However, the lateral dimension of the slit 25 is smaller than the lateral dimension of the projecting portion 5, and the edge portions 27, 27 on both lateral sides of the slit 25 protrude to the inner side of the projecting portion 5 by the same amount, respectively. It is in the shape.

Further, the vertical dimension of the slit 25 is also smaller than the vertical dimension of the projecting portion 5, and the entire opening of the slit 25 is covered with the projecting portion 5.
The housing 3, the cylindrical body 19, and the projecting portion 5 are all made of metal and are conductively connected to each other. The housing 3 is grounded.

A rod-shaped conductive portion 29 hangs down at a position deflected toward the projecting portion 5 from the central axis of the cylindrical body 19, and its lower end is lowered from the suction port 11, but above the partition portion 17. A large number of needle-like electrodes 31 are attached to the rod-shaped conductive portion 29 at predetermined intervals in the vertical direction. The needle-like electrode 31 extends in the horizontal direction and lies on an intersecting line that intersects the center of the line connecting both edges 27 and 27 of the slit 25 at a right angle. The edge (tip portion) 33 of the needle electrode 31 faces the slit 25 side.
An insulating cover 35 is fitted into the lower end of the rod-like conductive portion 29, and the downward discharge is restricted. The upper end portion of the rod-shaped conductive portion 29 is inserted into the insulating pipe 37. The insulating pipe 37 penetrates from the ceiling portion of the housing 3.

  The upper end of the rod-like conductive portion 29 is connected to a conducting wire (not shown), and this conducting wire is passed through the insulating pipe 37. A high voltage cable (not shown) is connected to a high voltage power source (not shown) constituted by a Cockcroft-Walton circuit, and the lead wire taken out from the high voltage cable is passed through the insulating pipe 37 as the above-described lead wire. A high voltage is supplied to the rod-shaped conductive portion 29 for discharging.

  In addition to the housing 3 side, the air purifier 1 is also provided with an operation panel (not shown) in which display portions such as operation buttons and operation states are arranged.

The air purifier 1 is configured as described above.
Next, the dust collection mechanism will be described with reference to FIGS. FIG. 3 is a partially edited version of FIG. 2 for convenience of explanation.
In addition, the following demonstrates the air purifier 1 based on the example installed in the food processing factory which uses wheat flour as a raw material, and not only dust collection but deodorization is intended. Therefore, in this example, airborne particles to be removed, that is, contaminating particles, are larger in the flour (C) and smaller in the odorous particle (D).
As shown in FIG. 3, the exhaust gas discharged from the processing apparatus flows into the inside of the cylindrical body 19 from the suction port 11 through the suction pipe 21 and becomes a swirl flow (a dashed line arrow (A)). And rise while rotating. The speed of the swirling flow (A) is adjusted so that the flour (C) contained therein is attracted to the cylindrical body 19 side due to the action of centrifugal force, but does not collide with the inner surface of the cylindrical body 19. ing.

  On the other hand, since a high voltage power supply of direct current is supplied from the high voltage power supply machine, the edge 33 of the needle electrode 31 functions as a discharge electrode, and both edges 27 and 27 of the slit 25 function as counter electrodes. Discharge mainly occurs between them, and a strong electron current (thick arrow (E)) is formed. The direction of the electron flow (E) is a direction from the edge 33 toward the edge 27.

  The air (molecules) constituting the swirling flow (A) is pushed by the charge (e) of the electron flow (E) and bent in a direction in which the movement direction enters the protruding portion 5. Accordingly, a part of the swirling flow (A) is guided to the protruding portion 5 side and enters through the slit 25. Since the edge portions 27 and 27 protrude in a warped shape and are narrowed at the entrance / exit of the projecting portion 5, when entering the inside of the projecting portion 5, two small swirling flows (a) are formed and the cylindrical body 19. Instead of returning to the side, it will stay as a staying area.

As shown in the image diagram of FIG. 4, flour (C) and odorous particles (D) also enter the projecting portion 5 along with the swirling flow (A), but charge from the electron flow (E). (E) is received and charged.
Flour (C) is not a true sphere, but has an uneven shape, and the charge (e) is likely to be charged in a convex pointed portion, that is, an edge portion. Therefore, when charged, the charge is biased and polarized.
The charged wheat flour (C) is floating in the small swirl flow (a) and rotates or changes the swirl trajectory according to the mass, so that it is easy to approach. Therefore, when approaching in the direction in which the electrostatic attractive force acts, the electrostatic attractive force works and agglomerates and continuously deforms.

When the mass increases due to aggregation, the centrifugal force also increases, so that the centrifugal force also acts to collide with and adhere to the side surface of the protruding portion 5 as shown in the image diagram of FIG. Alternatively, it falls by its own weight, collides with the lower surface of the projecting portion 5 and adheres thereto.
On the adhering flour (C), the next flying flour (C) sequentially adheres, and the accumulation of the flour (C) proceeds. As described above, the deformed one is attached, and the tip serves as a ground electrode, so that the tip is a preferential destination for the next incoming flour (C). Therefore, anisotropy is observed in the deposited structure, and a lot of gap spaces are created.
The odor particles (D) are also accompanied by the small swirl flow (a), and are trapped and adsorbed when entering the gap space. Some of the odor particles (D) are also charged, and these are more easily captured because of electrostatic attraction. Thus, the accumulation structure of flour (C) acts as an adsorption site for odorous particles (D). For the convenience of visual recognition, in FIG. 5, the odorous particles (D) are drawn extremely large relative to the flour (C).
According to the above-mentioned image, particles having different particle diameters can be removed well, so that the exhaust gas is efficiently purified.

Note that not all of the flour (C) is charged, and the electrostatic attraction described above cannot be expected for these. However, since these are also retained in the narrow protruding portion 5, the agglomerated and coarsened flour (C ) Will also increase the chance of clashing.
Therefore, the flour (C) including the flour (C) that has entered the protruding portion 5 is efficiently attached to the inner surface of the protruding portion 5 and removed from the exhaust gas.
Thereafter, when the exhaust gas rises and approaches the exhaust pipe 23, the flour (C) and odorous particles (D) are removed, and the exhaust gas is discharged from the exhaust port 13 and then released outdoors.

As described above, the air purifier 1 is configured such that the flour (C) and the odorous particles (D) are intensively captured in the protruding portion 5.
And since the protrusion part 5 will open if the horizontal lid 7 is opened, it inserts a cleaning tool from there, cleans the inner surface of the protrusion part 5, and removes the adhering flour (C) and odorous particles (D). It's easy.
Moreover, even if it falls to the bottom surface of the housing 3, the bottom side opens if the horizontal lid 9 is opened, so that it can be cleaned by inserting a cleaning tool from there, and the attached flour (C) and odorous particles (D) can be removed. It is easy to remove.

As described above, since the place where the flour (C) and odorous particles (D) are deposited is an easy-to-maintenance place, the burden of maintenance is significantly reduced compared to conventional air purifiers.
The air purifier 1 is designed so that the vertical and horizontal dimensions of the housing 3 are about 0.8 m × 0.8 m and the height is about 2 m.

The air purifier 1 can also be provided with a dedicated adsorption structure for enhancing deodorization.
FIG. 6 shows an example thereof, and a honeycomb catalyst 39 is disposed inside the protruding portion 5. The honeycomb catalyst 39 is a ceramic filter obtained by extruding an adsorbing material such as activated carbon and zeolite into a honeycomb shape, and is detachable. The odorous particles (D) are captured by the honeycomb catalyst 39.
Since the honeycomb catalyst 39 does not hinder the flight of the charged wheat flour (C), the above-mentioned adhesion / deposition is not impaired.
By using this honeycomb catalyst 39 in combination, fine odor particles (C) can be captured without leakage.

  Although the embodiments of the present invention have been described above, the specific configuration of the present invention is not limited to the above-described embodiments, and even if there is a design change within a scope not departing from the gist of the present invention. Included in the invention.

DESCRIPTION OF SYMBOLS 1 ... Stationary type air purifier 3 ... Housing 5 ... Projection part 7, 9 ... Horizontal cover 11 ... Intake port 13 ... Exhaust port 15 ... Tube 17 ... Partition part 19 ... Cylindrical body 21 ... Suction pipe 23 ... Exhaust pipe 25 ... Slit 27 ... Edge 29 ... Stand-shaped conductive part 31 ... Needle electrode 33 ... End (of needle electrode) 35 ... Insulation cover 37 ... Insulating pipe 39 ... Honeycomb catalyst A ... Swirl flow a ... Small swirl flow C ... Wheat flour E ... Electron flow D ... Smell particles

Claims (5)

  A vertical cylindrical body through which the exhaust gas to be treated is passed, a slit formed on the circumferential surface of the cylindrical body, and projecting outside the cylindrical body surrounding the slit, and the inner surface is conductive A projecting portion; a lid provided on the projecting portion; a discharge electrode provided in the cylindrical body and disposed at a position deflected from the central axis of the cylindrical body toward the projecting portion; and A counter electrode provided on the edge side, and swirl flow forming means for passing the exhaust gas so that the exhaust gas passed through the cylindrical body flows while rotating around the central axis, and the projecting portion includes An air purifier characterized in that it is a staying area in which exhaust gas flowing into it stays. In the air purifier according to claim 1,
An air purifier characterized in that the slit edge projects toward the exhaust gas inlet / outlet side of the projecting portion to narrow the inlet. In the air purifier according to claim 1 or 2,
An air purifier, wherein the protruding portion is provided with an adsorption structure portion. In the air purifier according to any one of claims 1 to 3,
An air purifier characterized in that an opening is formed separately from the slit on the bottom side of the cylindrical body, and the opening is also closed by a lid. In the air purifier according to any one of claims 1 to 4,
An air purifier characterized by being interposed in an exhaust gas discharge line to the outdoors.

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